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Небесная энциклопедия

Космические корабли и станции, автоматические КА и методы их проектирования, бортовые комплексы управления, системы и средства жизнеобеспечения, особенности технологии производства ракетно-космических систем

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Мониторинг СМИ

Мониторинг СМИ и социальных сетей. Сканирование интернета, новостных сайтов, специализированных контентных площадок на базе мессенджеров. Гибкие настройки фильтров и первоначальных источников.

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Поддерживает ввод нескольких поисковых фраз (по одной на строку). При поиске обеспечивает поддержку морфологии русского и английского языка
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Применить Всего найдено 7179. Отображено 100.
05-01-2012 дата публикации

Primary Side Voltage Control in Flyback Converter

Номер: US20120002449A1
Автор: Jinho Choi, Wanfeng Zhang, Yangsoo Park
Принадлежит: MARVELL WORLD TRADE LTD

In one embodiment, an apparatus includes a sampling component. The sampling component receives a first voltage signal on a primary side of a transformer and monitors the first voltage signal to determine a voltage sampling time. The determined voltage sampling time is when the first voltage signal is used to estimate a second voltage level on a secondary side of the transformer. The first component further samples the first voltage signal at the voltage sampling time to determine a first voltage level. A second component outputs a control signal to control a switch to regulate the second voltage level based on the first voltage level.

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Номер записи: 1
12-01-2012 дата публикации

Apparatus and method for output voltage calibration of a primary feedback flyback power module

Номер: US20120008345A1
Автор: Chien-Fu Tang, Isaac Y. Chen, Liang-Pin Tai
Принадлежит: RICHTEK TECHNOLOGY CORP

An apparatus and method for output voltage calibration of a primary feedback flyback power module extract the difference between the output voltage of the power module and a target value, and according thereto, calibrate a reference voltage which is used in regulation of the output voltage, to thereby calibrate the output voltage to be the target value.

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Номер записи: 2
26-04-2012 дата публикации

Circuits and methods for alternating current-to-direct current conversion

Номер: US20120099354A1
Автор: Jianlong GAO, Jianping Xu, Tiesheng YAN
Принадлежит: O2Micro Inc

An AC-to-DC converter for converting an AC voltage to a DC voltage includes a first converter, a second converter, a sense circuit, a controller, and an enabling circuit. The first converter converts an AC voltage to a first DC voltage. The second converter converts the first DC voltage to a second DC voltage. The sense circuit coupled to the first and second converters provides a first sense signal indicative of the first DC voltage and a second sense signal indicative of the AC voltage. The controller coupled to the first and second converters controls the first and second DC voltages. The enabling circuit coupled to the sense circuit generates a control signal to the controller to disable both the first converter and the second converter by comparing the first sense signal to a first threshold voltage and comparing the second sense signal to a second threshold voltage.

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Номер записи: 3
17-05-2012 дата публикации

Controllers, power supplies and control methods

Номер: US20120120533A1
Автор: Kuo-Chien Huang, Ren-Yi Chen
Принадлежит: Leadtrend Technology Corp

Power supplies together with related over voltage protection methods and apparatuses. A power supply has a transformer including a primary winding and an auxiliary winding. A power switch is coupled to the primary winding and a sensing resistor coupled between the power switch and a grounding line. A multi-function terminal of a controller is coupled to the sensing resistor. A diode and a first resistor is coupled between the auxiliary winding and the multi-function terminal.

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Номер записи: 4
07-06-2012 дата публикации

Flyback primary side output voltage sensing system and method

Номер: US20120140531A1
Автор: FENG Lin
Принадлежит: Individual

A method and apparatus of primary side output voltage sensing for a flyback power converter preserves secondary-side tranformer isolation without the use of opto-isolators and does not require multiple high-speed sample and hold circuits. A timing circuit measures the duration of the diode conduction interval during a first PWM control cycle and applies this measurement to set the voltage sampling time of the feedback loop during the next PWM cycle. The voltage sampling time for the next PWM cycle is configurable and may be set to occur near the middle of the diode conduction interval or near the end of the diode conduction interval. The cycle-to-cycle PWM duty cycle adjustment step size may be limited to ensure that the diode conduction interval does not vary substantially from cycle to cycle.

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Номер записи: 5
12-07-2012 дата публикации

Switching Power Converter Having Optimal Dynamic Load Response with Ultra-Low No Load Power Consumption

Номер: US20120176820A1
Автор: David Nguyen, Fuqiang Shi, Xiaolin Gao, YONG Li
Принадлежит: iWatt Inc

A switch controller is disclosed that adaptively controls the operating frequency of a switching power converter in order to improve one-time load response and repetitive dynamic load responses. During a transition from a high load to low load condition, the switch controller clamps the operating frequency of the switching power converter at an intermediate frequency for a period of time before allowing the operating frequency to return to a frequency associated with the low load condition. The clamped frequency is higher than the frequency associated with the low load condition thereby allowing improved response to a subsequent load change to a high load condition. Thus, the system improves dynamic load response without compromising no-load power consumption.

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Номер записи: 6
18-10-2012 дата публикации

Power supply wth digital feedback signaling

Номер: US20120262956A1
Автор: Maxwell Scott DeHaven
Принадлежит: Hewlett Packard Development Co LP

Apparatus and methods are provided for use with power supplies. A controller regulates power supply output by way of feedback signaling. Current pulses generated by an electrical load are detected in the feedback signaling and are processed to derive a sequence of digital bits. The digital, bits are subjected to validity testing and decoded as digital data. Operations of the power supply are adjusted and requests for information are answered in accordance with the digital data.

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Номер записи: 7
20-12-2012 дата публикации

Power switch controllers and methods used therein for improving conversion effeciency of power converters

Номер: US20120320632A1
Автор: Chien-Liang Lin, Sergey Gaitukevich, Siarhei KALODKA
Принадлежит: Shamrock Micro Devices Corp

Power switch controllers and methods used therein are disclosed. An exemplifying power switch controller includes a window provider, a sensor and a logic controller. The window provider provides minimum and maximum time signals to indicate the elapses of a minimum time and a maximum time, respectively. The sensor detects a terminal of an inductive device, to generate a trigger signal. The logic controller prevents a power switch connected to the inductive device from being turned on before the elapse of the minimum time, forces the power switch to be turned on after the elapse of the maximum time, and turns on the power switch if the trigger signal is asserted.

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Номер записи: 8
21-03-2013 дата публикации

SURFACE ACOUSTIC WAVE DEVICE

Номер: US20130069481A1
Автор: IDA Yasuyuki, Kimura Tetsuya, SAJI Mari
Принадлежит: MURATA MANUFACTURING CO., LTD.

A surface acoustic wave device includes a piezoelectric substrate including a groove located in a surface thereof, an IDT electrode, and a dielectric film. The IDT electrode includes a first electrode layer located in the groove and a second electrode layer located outside the groove. The dielectric film is arranged on the piezoelectric substrate so as to cover the IDT electrode. The second electrode layer is tapered toward a side opposite to the piezoelectric substrate. 1. A surface acoustic wave device comprising:a piezoelectric substrate including a groove located in a surface thereof;an IDT electrode including a first electrode layer located in the groove and a second electrode layer located outside the groove; anda dielectric film arranged on the piezoelectric substrate so as to cover the IDT electrode; whereinthe second electrode layer is tapered toward a side opposite to the piezoelectric substrate.2. The surface acoustic wave device according to claim 1 , wherein the first electrode layer is tapered toward the piezoelectric substrate side.3. The surface acoustic wave device according to claim 1 , wherein a cross-sectional shape of the second electrode layer is trapezoidal claim 1 , and a ratio T/R of a length T of an upper base to a length R of a lower base in a cross section of the second electrode layer is within a range of about 0.8 to about 0.99.4. The surface acoustic wave device according to claim 2 , wherein a cross-sectional shape of the second electrode layer is trapezoidal claim 2 , and a ratio T/R of a length T of an upper base to a length R of a lower base in a cross section of the second electrode layer is within a range of about 0.8 to about 0.99.5. The surface acoustic wave device according to claim 3 , wherein a ratio HT/R of a height HT to the length R of the lower base in the cross section of the second electrode layer is within a range of about 0.1 to about 0.25.6. The surface acoustic wave device according to claim 4 , wherein a ratio HT/ ...

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Номер записи: 9
11-04-2013 дата публикации

Apparatus, System and Method for Cascaded Power Conversion

Номер: US20130088078A1
Автор: Lehman Bradley M., Rodriguez Harry, Shteynberg Anatoly
Принадлежит: POINT SOMEE LIMITED LIABILITY COMPANY

An apparatus, method, and system are provided for power conversion to supply power to a load such as a plurality of light emitting diodes. An exemplary apparatus comprises: a first power converter stage having a first power switch and a first inductive element; a second power converter stage having a second power switch and a second inductive element; a plurality of sensors; and a controller. The second power converter stage provides an output current to the load. The controller is adapted to use a sensed input voltage to determine a switching period, and is further adapted to turn the first and second power switches into an on-state at a frequency substantially corresponding to the switching period while maintaining a switching duty cycle within a predetermined range. 1. An apparatus for power conversion , the apparatus comprising:a first power converter stage including a first power switch;a second power converter stage coupled to the first power converter stage, wherein the second power converter stage includes a second power switch, and wherein the second power converter stage is couplable to provide an output current to a load;a first sensor configured to sense an electrical parameter; anda controller coupled to the first power switch, the second power switch, and the first sensor, wherein the controller is configured to turn the first and second power switches into an on-state at a frequency substantially corresponding to a switching period.2. The apparatus of claim 1 , wherein the controller is further configured to determine the switching period as a switching interval that maintains voltage stress of the first power switch and the second power switch below corresponding predetermined levels.3. The apparatus of claim 1 , wherein the controller is further configured to maintain a switching duty cycle within a predetermined range to maintain voltage stress of the first power switch and the second power switch below corresponding predetermined levels.4. The ...

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Номер записи: 10
11-04-2013 дата публикации

SWITCHING CONTROL CIRCUIT AND SWITCHING POWER SUPPLY APPARATUS

Номер: US20130088896A1
Автор: HOSOTANI Tatsuya
Принадлежит: MURATA MANUFACTURING CO., LTD.

In a switching control circuit, a length of a soft start period is set by a time constant of an external circuit that is connected to a soft start terminal of a switching control IC. After a voltage of the soft start terminal has reached a predetermined voltage at the termination of the soft start period, the on-pulse period of a first switching device is limited by a maximum value. When a Zener diode is connected between the soft start terminal and ground, the upper limit voltage of the soft start terminal is a Zener voltage and, hence, the maximum on-pulse period is limited by this voltage. As a result, the switching control circuit and a switching power supply apparatus, which have a soft start function and a power limiting function, are reduced in size and cost by limiting the number of terminals. 1. A switching control circuit for use in a power conversion circuit of a switching power supply apparatus , the switching control circuit comprising:a plurality of external terminals;a semiconductor integrated circuit arranged to control on/off operations of a switching device;a soft start terminal that receives a control voltage used to control of on/off switching operations of the switching device during a soft start period, which is an activation period from a start of an operation to a steady operation of the power conversion circuit;a soft start controller arranged and programmed to control an on-period of the switching device during the activation period based on a signal of the soft start terminal; anda maximum on-pulse period limiting device arranged to detect, as a determination object signal, a voltage induced in an external circuit that is connected to the soft start terminal and that includes at least a resistor element or a semiconductor element, and arranged to set a limit value of an on-period of the switching device during a normal period in accordance with the determination object signal.2. The switching control circuit according to claim 1 , wherein ...

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Номер записи: 11
18-04-2013 дата публикации

DOWN CONVERTER

Номер: US20130094250A1
Автор: Raykhman Mykhaylo, WEGER Robert
Принадлежит: MINEBEA CO., LTD.

A down converter for converting an input DC voltage (Vin) into a lower output DC voltage (Vout). The down converter has on the primary side () an LC series resonance circuit () that can be connected via a first switch (S) to the input voltage (Vin) and via a second switch (S) to ground. On the secondary side (), an output switch (S) and an output capacitor (C) are each connected in parallel to the DC voltage output (Vout) and connected to each other through an inductor (L). The output switch (S) is connected via a diode (Dr) to the input voltage (Vin) so as to divert voltage overshoots. 112342123333. A voltage converter () , comprising a primary side () having a DC voltage input (Vin) and a secondary side () having a DC voltage output (Vout) , wherein an LC series resonance circuit () is disposed on the primary side () that is connectable via a first switch (S) to the input voltage and via a second switch (S) to ground , and wherein on the secondary side () , an output switch (S) and an output capacitor (C) are each connected in parallel to the DC voltage output (Vout) and connected to each other through an inductor (L) , a diode (Dr) connects the output switch (S) to another component of the circuit , so that voltage overshoots occurring at the output switch (S) are diverted to another component of the circuit , wherein a cathode of the diode (Dr) is connected to the other component.2235. A voltage converter according to claim 1 , wherein the primary side () and the secondary side () are galvanically isolated through a transformer ().347538. A voltage converter according to claim 2 , wherein the LC resonance circuit () is connected directly to a primary winding () of the transformer () and on the secondary side claim 2 , the output switch (S) is connected through a capacitor (Cr) to a secondary winding ().44. A voltage converter according to claim 3 , wherein excess energy is fed into the capacitor (Cr) of the LC series resonance circuit ().5375. A voltage ...

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Номер записи: 12
25-04-2013 дата публикации

DRIVER CIRCUIT FOR DRIVING A LOAD CIRCUIT

Номер: US20130100706A1
Автор: ELFERICH Reinhold
Принадлежит: KONINKLIJKE PHILIPS ELECTRONICS, N.V.

Driver circuits () for driving load circuits comprise transformer circuits () with primary side windings to be coupled to source circuits and with secondary side windings to be coupled to the load circuits. By providing the driver circuits () with determination circuits () for determining secondary side currents as functions of primary side currents, primary side voltages, primary side inductances and transformer ratios, the secondary side currents can be determined solely at primary sides of the transformer circuits (). Functions may define secondary side currents to be proportional to differences between first signals proportional to integrals of primary side voltages divided by primary side inductances and second signals proportional to primary side currents, the differences being multiplied by the transformer ratios. The primary side inductances may be inductances measured at primary sides and the transformer ratios may be voltage ratios of the transformer circuits (), both for open secondary sides of the transformer circuits (). 1. A driver circuit for driving a load circuit , the driver circuit comprisinga transformer circuit with a primary side winding to be coupled to a source circuit and with a secondary side winding to be coupled to the load circuit, anda determination circuit for determining a secondary side current as a function of a primary side current and a primary side voltage and a primary side inductance and a transformer ratio.2. The driver circuit as claimed in claim 1 , the load circuit comprising a load claim 1 , the load comprising one or more light emitting diodes claim 1 , said function defining the secondary side current to be proportional to a difference between a first signal proportional to an integral of the primary side voltage divided by the primary side inductance and a second signal proportional to the primary side current claim 1 , the difference being multiplied by the transformer ratio.3. The driver circuit as claimed in claim 2 ...

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Номер записи: 13
25-04-2013 дата публикации

Magnetron Power Supply

Номер: US20130100709A1
Автор: Lidstrom Kjell
Принадлежит:

A power supply for a magnetron has a high voltage converter, a microprocessor and a resistor. The high voltage converter comprises an integrated circuit oscillator, switching transistors, an inductance L, a transformer and a rectifier. A voltage source supplies an augmented DC voltage to the converter. An operational amplifier, arranged as an error signal magnifier with an integrating capacitor and a resistor, compares a control signal from microprocessor and resistor and supplies an output signal to the oscillator. Oscillator controls switching transistors, the output of which connects to inductance and the primary winding of the transformer. The secondary winding of the transformer is connected to half bridge diodes and capacitors, which provide DC current from the transformer to the magnetron. 1. A power supply for a magnetron comprising:a DC voltage source; a capacitativeinductive resonant circuit,', 'a switching circuit adapted to drive the resonant circuit, at a variable frequency above the resonant frequency the resonant circuit, the variable frequency being controlled by a control signal input to provide an alternating voltage,', 'a transformer connected to the resonant circuit for raising the alternating voltage,', 'a rectifier for rectifying the raised alternating voltage to a raised DC voltage for application to the magnetron;, 'a converter for raising the output voltage of the DC voltage source, the converter havingmeans for measuring the current from the DC voltage source passing through the converter;a microprocessor programmed to produce a control signal indicative of a desired output power of the magnetron; andan integrated circuit arranged in a feed back loop and adapted to apply a control signal to the converter switching circuit in accordance with a comparison of a signal from the current measuring means with the signal from the microprocessor for controlling the power of the magnetron to the desired power.2. A power supply as claimed in claim ...

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Номер записи: 14
25-04-2013 дата публикации

Switching Circuit

Номер: US20130100711A1
Автор: Halberstadt Hans, KLEINPENNING Jeroen, Langeslag Wilhelmus Hinderikus Maria
Принадлежит: NXP B.V.

A switching circuit () comprising an inductive component () including at least one winding; and a switch () is configured to transfer power from a voltage source () to the inductive component () in accordance with a switch control signal (). The switching circuit () also comprises a controller () configured to integrate the voltage across the inductive component () in order to generate a signal representative of magnetic flux in the inductive component (); and use the signal representative of the magnetic flux in the inductive component to account for a peak magnetization current value in order to control the switch (). 1. A switching circuit comprising:an inductive component including at least one winding;a switch configured to transfer power from a voltage source to the inductive component in accordance with a switch control signal; and integrate the voltage across the inductive component in order to generate a signal representative of magnetic flux in the inductive component; and', 'use the signal representative of the magnetic flux in the inductive component to account for a peak magnetization current value in order to control the switch., 'a controller, configured to2. The switching circuit of claim 1 , wherein the controller is configured to use the signal representative of the magnetic flux in the inductive component to compensate for errors caused by at least one of propagation delay and resonance in the switching circuit.3. The switching circuit of claim 1 , wherein the switch is a FET having a voltage at the source of the FET (Vsource) claim 1 , and a desired value of the voltage at the source of the FET (Vsource claim 1 , setpoint) and wherein the controller is further configured to:record the value of the signal representative of the magnetic flux in the inductive component when the FET is switched off as a first value;record the value of the signal representative of the magnetic flux in the inductive component at a start of a secondary stroke as a ...

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Номер записи: 15
25-04-2013 дата публикации

Switching power conversion circuit and power supply using same

Номер: US20130100713A1
Автор: Chin-Tsai Chiang, Dezhi Jiao, Dong Wei
Принадлежит: Delta Electronics Shanghai Co Ltd

A switching power conversion circuit having a two-stage power circuit topology and capable of performing power factor correction is disclosed. In a case that the electrical energy of the switching power conversion circuit needs not to be provided to the system circuit, for example the load and the electronic device fails to be operated, the switching power conversion circuit will be adaptively disabled. As a consequence, the switching power conversion circuit could achieve a power-saving purpose. Moreover, the switching power conversion circuit could be applied to a power supply. When the electronic device is not in use, the power supply has reduced power consumption, thereby achieving a power-saving purpose.

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Номер записи: 16
25-04-2013 дата публикации

POWER CONTROLLER WITH SMOOTH TRANSITION TO PULSE SKIPPING

Номер: US20130100714A1
Автор: Gaknoki Yury, Mao Mingming, ZHANG Guangchao
Принадлежит: POWER INTEGRATIONS, INC.

A power converter control circuit includes a ramp signal circuit, a blanking circuit, and a pulse driver circuit. The ramp signal circuit provides a ramp signal in response to a power converter feedback signal and an enable signal. The blanking circuit provides a blanking signal in response to the ramp signal and a clock signal. The blanking signal is provided when both the ramp signal is increasing in value and the enable signal indicates a light load operating condition. The pulse driver circuit provides a power switch control pulse in accordance with the clock signal and in the absence of the blanking signal. 1. A power converter control circuit comprising:a ramp signal circuit that is operative to provide a ramp signal in response to a power converter feedback signal and an enable signal;a blanking circuit that is operative to provide a blanking signal in response to the ramp signal and a clock signal, wherein the blanking signal is provided when the ramp signal is increasing in value and the enable signal indicates a light load operating condition; anda pulse driver circuit that is operative to provide a power switch control pulse in accordance with the clock signal and in the absence of the blanking signal.2. The power converter control circuit of wherein the enable signal indicates the light load operating condition when the power converter feedback signal is less than a predetermined threshold value.3. The power converter control circuit of comprising a comparator circuit that is operative to provide the enable signal in response to a comparison of a predetermined threshold value and the power converter feedback signal.4. The power converter control circuit of wherein the ramp circuit comprises:a capacitance; anda variable current source and sink circuit that is operative to provide a ramp current in response to the power converter feedback signal, wherein the ramp current charges the capacitance providing the ramp signal.5. The power converter control ...

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Номер записи: 17
09-05-2013 дата публикации

Switching Regulator and Control Circuit and Control Method Thereof

Номер: US20130114308A1
Автор: Chen Pei-Yuan, Hsiu Leng-Nien, Liao Chia-Wei, Liu Jing-Meng
Принадлежит:

The present invention discloses a switching regulator and a control circuit and a control method thereof. The control circuit of the switching regulator, which controls rectified power within a predetermined range, detects an input voltage and an input current to generate a voltage detection signal and a current detection signal respectively, and the voltage detection signal and the current detection signal are multiplied by one the other to generate a power index. The control circuit generates an error signal according to the power index and a reference signal. A low-pass-filter filters a high frequency band in the process. A control signal generation circuit of the control circuit generates a control signal according to the error signal. And a driver circuit of the control circuit generates an operation signal according to the control signal, for switching a power switch to convert the rectified power to an output voltage. 1. A switching regulator , comprising:a rectifier circuit, for converting an AC power to a rectified power, wherein the rectified power includes an input voltage and an input current;a transformer, which includes a primary winding and a secondary winding, wherein the primary winding is for receiving the rectified power, and the secondary winding is for generating an output voltage;a power switch, which is coupled to the primary winding, for switching according to an operation signal to convert the rectified power to the output voltage; and a power index generation circuit, for generating a power index according to the input voltage and the input current;', 'an amplifier circuit, for generating an error signal according to the power index and a first reference signal;', 'a control signal generation circuit, for generating a control signal according to the error signal;', 'a driver circuit, for generating the operation signal according to the control signal; and', 'a low-pass-filter (LPF) circuit, which is coupled to or integrated in the power ...

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Номер записи: 18
09-05-2013 дата публикации

Power Supply Control Circuit and method for sensing voltage in the power supply control circuit

Номер: US20130114310A1
Автор: Huang Chun-Yen, Liu Chia-Chuan
Принадлежит:

The present invention discloses a power supply control circuit, the power supply providing an output voltage to an output terminal from an input terminal through a transformer having a primary winding and a secondary winding, the power supply control circuit comprising: a power switch electrically connected with the primary winding; a switch control circuit controlling the power switch; and a sensing circuit supplying an output signal to the switch control circuit according to voltage signals obtained from two sides of the primary winding, wherein the sensing circuit includes a setting circuit for deciding the output voltage according to a reference signal. The present invention also relates to a voltage sensing method in the power supply control circuit. 1. A power supply control circuit , the power supply providing an output voltage to an output terminal from an input terminal through a transformer having a primary winding and a secondary winding , the power supply control circuit comprising:a power switch electrically connected with the primary winding;a switch control circuit controlling the power switch; anda sensing circuit converting voltage signals (Vin and Vsw) obtained from the two sides of the primary winding to a first and a second current signals (Ia and Ib), and supplies an output signal to the switch control circuit according to the first, the second, and a setting current signal, wherein the sensing circuit includes a setting circuit for providing the setting current signal to decide the output voltage according to a reference signal such that the output voltage is settable by the setting current signal in correspondence to a turn ratio of the secondary winding to the primary winding, the setting circuit providing the setting current signal irrespective of the voltage signals obtained from two sides of the primary winding.2. (canceled)3. The power supply control circuit of claim 1 , wherein the sensing circuit comprises a current comparator which ...

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Номер записи: 19
16-05-2013 дата публикации

METHOD AND APPARATUS TO REGULATE AN OUTPUT VOLTAGE OF A POWER CONVERTER AT LIGHT/NO LOAD CONDITIONS

Номер: US20130121040A1
Автор: Djenguerian Alex B., Lund Leif, Polivka William M.
Принадлежит: POWER INTEGRATIONS, INC.

An example controller for a primary side control power converter includes a feedback circuit, a driver circuit, and an adjustable voltage reference circuit. The feedback circuit compares a feedback signal representative of a bias winding voltage of the power converter with a voltage reference. The driver circuit outputs a switching signal having a switching period to control a switch to regulate an output of the power converter in response to the feedback signal and enables or disables a switching period based on the output of the feedback circuit. The adjustable voltage reference circuit adjusts the voltage reference by a first amount in response to a first number of disabled switching periods indicating a first load condition at the output of the power converter and by a second amount in response to a second number of disabled switching periods indicating a second load condition at the output of the power converter. 1. A controller for a primary side control power converter , the controller comprising:a feedback circuit coupled to compare a feedback signal representative of a bias winding voltage of the power converter with a voltage reference;a driver circuit coupled to output a switching signal having a switching period to control a switch to regulate an output of the power converter in response to the feedback signal, wherein the driver circuit allows the switch to turn on and off during an enabled switching period and prevents the switch from turning on during a disabled switching period, and wherein the driver circuit enables the switching period in response to the feedback circuit indicating that the feedback signal is less than or equal to the voltage reference and disables the switching period in response to the feedback circuit indicating that the feedback signal is greater than the voltage reference; andan adjustable voltage reference circuit coupled to adjust the voltage reference by a first amount in response to a first number of disabled switching ...

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Номер записи: 20
23-05-2013 дата публикации

SWITCHING CONTROL CIRCUIT AND SWITCHING POWER SUPPLY APPARATUS

Номер: US20130128623A1
Автор: HOSOTANI Tatsuya
Принадлежит: MURATA MANUFACTURING CO., LTD.

An external circuit is connected to a polarity detection terminal of a switching control IC. An increased value of the voltage of a pulse signal input to the polarity detection terminal at the time of the activation of a power supply changes in response to this external circuit. Accordingly, owing to the external circuit connected to the polarity detection terminal, the validity/invalidity of a standby mode is set. When the standby mode is validated, a blanking frequency changes in response to the voltage of a feedback terminal, and a switching loss in a light load is reduced. Accordingly, a switching control circuit and a switching power supply apparatus are configured that are able to set the validity/invalidity of the standby mode or select the method of the standby mode without using a dedicated terminal. 1. A switching control circuit comprising: a semiconductor integrated circuit configured to include a plurality of external terminals and be provided in a power converter circuit of a switching power supply apparatus to control a switching element , whereinthe plural external terminals include a polarity detection terminal, into which a polarity inversion timing signal indicating a change in a polarity of a current flowing through or a voltage generated in an inductor or a transformer of the power converter circuit owing to an operation of the switching control circuit is input, and a feedback terminal into which a feedback signal used for detecting and controlling an output voltage obtained owing to an operation of the switching control circuit is input, whereinthe switching control circuit includes a switching element control mechanism configured to perform switching control of the switching element on the basis of a signal of the polarity detection terminal and a voltage of the feedback terminal,a control mode switching mechanism configured to switch between a control mode of the switching element when a load of the power converter circuit is in a standby ...

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Номер записи: 21
23-05-2013 дата публикации

APPARATUS AND METHOD FOR SENSING OF ISOLATED OUTPUT

Номер: US20130128625A1
Автор: Djenguerian Alex B., Odell Arthur B., Wu Henson
Принадлежит: POWER INTEGRATIONS, INC.

A power converter includes a current controller coupled to an energy transfer element to selectively enable a first, second or third current in the current controller. The first current is substantially zero, the second current is greater than the third current, and the third current is greater than the first current. The third current only partially discharges a capacitance coupled to the energy transfer element and the current controller. A control circuit is to be coupled to the current controller to selectively enable the first, second or third current in the current controller. A first feedback circuit is coupled to generate a first feedback signal while the first current is enabled by the current controller after a full discharge pulse. A second feedback circuit is coupled to generate a second feedback signal while the first current is enabled in the controller after a partial discharge pulse. 1. A power converter , comprising:an energy transfer element;a current controller coupled to the energy transfer element and coupled to an input of the power converter, wherein the current controller is coupled to selectively enable one of a first current, second current or third current in the current controller, wherein the first current is substantially zero, the second current is greater than the third current, and the third current is greater than the first current, wherein the third current is controlled to only partially discharge a capacitance coupled to a terminal coupled between the energy transfer element and the current controller;a control circuit to be coupled to the current controller to selectively enable said one of the first current, second current or third current in the current controller;a first feedback circuit coupled to the control circuit and coupled to generate a first feedback signal representative of an output of the power converter while the first current is enabled by the current controller after a full discharge pulse of current in the ...

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Номер записи: 22
23-05-2013 дата публикации

SWITCH CONTROL METHOD, SWITCH CONTROLLER, AND CONVERTER COMPRISING THE SWITCH CONTROLLER

Номер: US20130128627A1
Автор: EOM Hyun-Chul, MOON Sang-Cheol
Принадлежит: FAIRCHILD KOREA SEMICONDUCTOR LTD.

The present invention relates to a converter, a switch controller controlling switching operation of a power switch in the converter, and a switch control method. An exemplary embodiment of the present invention generates a reference current corresponding to an output current of the converter and generates a control voltage that depends on the reference current. The exemplary embodiment controls an increase or a decrease of the control voltage and determines a switching frequency of the power switch according to the control voltage. The exemplary embodiment controls on-time of the power switch using a reference voltage determined according to a control current that depends on the reference current. 1. A switch controller controlling switching operation of a power switch in a converter , comprising:a control voltage generator generating a reference current corresponding to an output current of the converter, and generating a control voltage that depends on the reference current;a frequency controller controlling increase or decrease of the control voltage, and controlling a switching frequency of the power switch according to the reference current; andan on-time controller controlling on-time of the power switch using a reference voltage determined by the control currents that depends on the reference current.2. The switch controller of claim 1 , wherein the control voltage generator comprises:a variable current source generating the reference current that varies according to the output current;a charging current source generating a charging current according to the reference current;a discharging current source generating a discharging current according to the reference current; anda capacitor connected to a node to which the charging current source and the discharging current source are connected, anda voltage charged in the capacitor is the control voltage.3. The switch controller of claim 2 , wherein the variable current source comprisesa transistor through which ...

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Номер записи: 23
30-05-2013 дата публикации

ISOLATED POWER SUPPLY DEVICE AND ILLUMINATION DEVICE

Номер: US20130134892A1
Автор: ARIMA Satoshi, Inoue Takashi, Kado Minoru
Принадлежит:

An insulated power supply device includes: an electric power conversion unit, a rectifier, a filter, a detection unit, a control circuit, and a signal transmission unit. The control circuit generates and outputs a control signal for a switching element that controls a current to be flown through a primary side of the electric power conversion unit. The signal transmission unit transmits, to the control circuit, a detection signal by the detection unit for detecting an output current or an output voltage. An output control pulse signal having control information in a duty ratio can be supplied as an outputted control signal individually to both of the control circuit and a secondary side of the electric power conversion unit. The output current or the output voltage can be thereby controlled. 17-. (canceled)8. An insulated power supply device comprising:an electric power conversion unit for converting alternating current power inputted to a primary side of the electric power conversion unit and outputting the power to a secondary side of the electric power conversion unit;a rectifier provided on the secondary side of the electric power conversion unit;a filter that passes therethrough voltage/current within a predetermined frequency band in voltage/current rectified by the rectifier;a detection circuit for detecting an output current or an output voltage, which is to be supplied to a load through the filter;a control circuit that generates and outputs a control signal for a switching element that controls a current in response to a detection signal by the detection circuit, wherein the current is to be flown through the primary side of the electric power conversion unit; anda signal transmission unit for transmitting the detection signal by the detection circuit to the control circuit;wherein the outputted control signal is configured to be supplied to both of the control circuit and the detection circuit, and to control the output current or the output voltage.9. ...

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Номер записи: 24
30-05-2013 дата публикации

CONVERTER CIRCUIT

Номер: US20130135904A1
Автор: Inakagata Satoru, MURAYAMA Kei
Принадлежит: Panasonic Corporation

A converter circuit includes a transformer having primary windings and at least one secondary winding, a rectifier circuit connected to the secondary winding, and oscillating circuits connected to the primary windings. Each of the oscillating circuits has a switch element unit having no body diode. 1. A converter circuit comprising:a transformer having primary windings and at least one secondary winding;a rectifier circuit connected to the secondary winding; andoscillation circuits connected to the primary windings,wherein each of the oscillation circuits includes a switch element unit having no body diode.2. A converter circuit comprising:a transformer having a first primary winding, a second primary winding and a secondary winding;a rectifier circuit connected between the secondary winding and a load;a first oscillation circuit connected to a first DC power source and the first primary winding;a second oscillation circuit connected to a second DC power source and the second primary winding; anda control circuit configured to control the first and the second oscillation circuit,wherein each of the first and the second oscillation circuit includes a switch element unit having no body diode.3. The converter circuit of claim 1 , wherein the switch element unit having no body diode has a lateral transistor structure using a GaN/AlGaN structure.4. The converter circuit of claim 1 , wherein the switch element unit having no body diode is a bidirectional switch element.5. The converter circuit of claim 2 , wherein the switch element unit of each of the first and the second oscillation circuit comprises two pairs of switch elements forming a full-bridge circuit.6. The converter circuit of claim 2 , wherein the switch element unit of each of the first and the second oscillation circuit comprises a pair of switch elements forming a half-bridge circuit.7. The converter circuit of claim 2 , wherein the switch element unit of each of the first and the second oscillation circuit ...

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Номер записи: 25
30-05-2013 дата публикации

CONTROL METHODS FOR SWITCHING POWER SUPPLIES

Номер: US20130135905A1
Автор: Yeh Wen-Chung
Принадлежит: LEADTREND TECHNOLOGY CORP.

An embodiment provides a control method capable of controlling a switching-mode power supply to provide an output power source. The switching-mode power supply has a winding coupled to an input power source and controlled by a switch to be energized or de-energized. The maximum current peak through the winding is set to be a predetermined value. A discharge time of the winding in a switching cycle period is detected. The switching cycle period of the switch is controlled to keep the ratio of the discharge time to the switching cycle period as a constant. 1. A control method for controlling an output power source of a switching power supply , the switching power supply comprising a winding coupled to an input power source , the winding controlling by a switch for charging or discharging , the control method comprising:controlling a peak current flowing through the winding to be a predetermined value;detecting a discharge time of the winding within a switching cycle period; andcontrolling a switching cycle period of the switch to make a ratio between the discharge time and the switching cycle period of the switch approximately equal to a constant value.2. The control method of claim 1 , further comprising:charging/discharging a capacitor with a first current source in the discharge time; andcharging/discharging the capacitor with a second current source in the switching cycle period of the switch;wherein a current ratio of the second current source to the first current source equals the constant value.3. The control method of claim 2 , further comprising:comparing a voltage of the capacitor to a reference voltage, and thus varying a control signal to influence a switching frequency of the switch.4. A constant current and constant voltage power converter claim 2 , comprising:a constant current feedback loop; anda constant voltage feedback loop;wherein the constant current feedback loop and the constant voltage feedback loop share one compensation capacitor.5. The ...

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Номер записи: 26
06-06-2013 дата публикации

SWITCHING POWER SUPPLY DEVICE AND METHOD FOR CONTROL THEREOF

Номер: US20130141946A1
Автор: NISHIKAWA Yukihiro, SAKURAI Masahiko
Принадлежит: FUJI ELECTRIC CO., LTD.

A switching power supply device and method for control thereof, including an input voltage generating unit, a transformer, an output voltage generating unit, a MOS transistor, an output voltage detecting unit, a switching control unit, and a power supply unit. The output voltage detecting unit detects a transformer tertiary winding voltage, compares it with a first reference value, compares the differentiated tertiary winding voltage with a second reference value, and determines the start and end of a detection period based on the two comparisons. The output voltage detecting unit also samples and holds the voltage with two sampling pulses within the detection period, selects one of the two sampled and held voltages, and outputs the selected voltage when the detection period ends. 1. A switching power supply device comprising:a transformer that includes a primary winding, a secondary winding, and a tertiary winding, where the primary winding is connected to an input voltage;a switching element connected to the primary winding;an output voltage generating unit that outputs an output voltage according to a secondary winding voltage generated in the secondary winding;an output voltage detecting unit that generates an output voltage detection signal representing the output voltage according to a detected voltage on the tertiary winding; anda control unit that controls switching the switching element on and off according to at least the output voltage detection signal, such that the output voltage is controlled to be a predetermined voltage, whereinthe output voltage detecting unit compares the detected voltage with a first reference value in a first comparison, differentiates the detected voltage to provide a differentiated value, compares the differentiated value with a second reference value in a second comparison, and determines a start and an end of a detection period on the basis of results of the first and second comparisons,the output voltage detecting unit ...

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Номер записи: 27
06-06-2013 дата публикации

SWITCHING POWER SUPPLY

Номер: US20130141947A1
Автор: NISHIKAWA Yukihiro, SAKURAI Masahiko
Принадлежит: FUJI ELECTRIC CO., LTD.

A flyback type switching power supply includes between P and N of a direct current output a sudden load change detector circuit, which normally has no power consumption, that detects only a transient fluctuation of a direct current output voltage, and starts the switching of a primary side semiconductor switch when there is no load or a light load, even when the semiconductor switch is in an off state, thereby enabling the detection of the direct current output voltage in a tertiary winding, and suppressing a drop in the direct current output voltage. 1. A switching power source device , comprising:a transformer having a primary winding, a secondary winding, and a tertiary winding;a semiconductor switch that on/off controls a first direct current voltage input into the primary winding with a switching operation;an output voltage generation unit that rectifies and smoothes a secondary winding voltage generated in the secondary winding by the switching operation of the semiconductor switch, generating a second direct current voltage as an output voltage;a power source unit that rectifies and smoothes a tertiary winding voltage generated in the tertiary winding by the switching operation of the semiconductor switch, generating a third direct current voltage;a switching control unit that generates a control signal that controls the switching operation of the semiconductor switch;an output voltage detector unit that detects a transformer voltage based on voltage information of the tertiary winding; anda current detector unit that detects current flowing through the semiconductor switch, whereinthe switching power source device supplies a constant output voltage to a load connected to the output voltage generation unit by controlling a turning on and off of the semiconductor switch in accordance with the current detected by the current detector unit and the voltage detected by the output voltage detector unit, includes in the output voltage generation unit a sudden load ...

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Номер записи: 28
06-06-2013 дата публикации

METHOD AND APPARATUS FOR IMPLEMENTING AN UNREGULATED DORMANT MODE WITH OUTPUT RESET IN A POWER CONVERTER

Номер: US20130141948A1
Автор: Bailey Douglas J., Matthews David Michael Hugh
Принадлежит: POWER INTEGRATIONS, INC.

A control circuit includes a feedback circuit, a drive signal generator, an unregulated dormant mode and output reset control circuit, and a counter. The feedback circuit generates an enable signal and in response, the drive signal generator regulates the output of the power converter. The unregulated dormant mode and output reset control circuit powers down the drive signal generator such that the regulation is ceased when the energy requirement at the output has fallen below a threshold. The drive signal generator is then powered up after a first period of time such that the regulation resumes. The counter then counts cycles of a clock signal for which the enable signal indicates an increase in the energy requirement at the output. The counter disables the drive signal generator when a count of the counter reaches a threshold number to discharge the output to less than a regulation output voltage value. 1. A control circuit for use in a power converter , the control circuit comprising:a feedback circuit coupled to receive a feedback signal representative of an energy requirement at an output of the power converter and to generate an enable signal in response thereto;a drive signal generator coupled to the feedback circuit to generate a drive signal to control switching of a power switch in response to the enable signal to regulate the output of the power converter to a regulation output voltage value;an unregulated dormant mode and output reset control circuit coupled to power down the drive signal generator for a first period of time such that the regulation of the output of the power converter is ceased in response to the enable signal indicating that the energy requirement at the output of the power converter has fallen below a first threshold, wherein the drive signal generator is unresponsive to the enable signal when powered down during the first period of time, and wherein the unregulated dormant mode and output reset control circuit powers up the drive ...

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Номер записи: 29
13-06-2013 дата публикации

PASSIVE RESONANT BIDIRECTIONAL CONVERTER WITH GALVANIC BARRIER

Номер: US20130148382A1
Автор: Rosenblad Nathan S.
Принадлежит: BUSEK COMPANY

A passive resonant bidirectional converter system that transports energy across a galvanic barrier includes a converter using at least first and second converter sections, each section including a pair of transfer terminals, a center tapped winding; a chopper circuit interconnected between the center tapped winding and one of the transfer terminals; an inductance feed winding interconnected between the other of the transfer terminals and the center tap and a resonant tank circuit including at least the inductance of the center tap winding and the parasitic capacitance of the chopper circuit for operating the converter section at resonance; the center tapped windings of the first and second converter sections being disposed on a first common winding core and the inductance feed windings of the first and second converter sections being disposed on a second common winding core for automatically synchronizing the resonant oscillation of the first and second converter sections and transferring energy between the converter sections until the voltage across the pairs of transfer terminals achieves the turns ratio of the center tapped windings. 1. A passive resonant bidirectional converter system that transports energy across a galvanic barrier comprising:a converter using at least first and second converter sections, each section including a pair of transfer terminals, a center tapped winding; a chopper circuit interconnected between said center tapped winding and one of said transfer terminals; an inductance feed winding interconnected between the other of said transfer terminals and said center tap and a resonant tank circuit including at least the inductance of said center tap winding and the parasitic capacitance of said chopper circuit for operating said converter section at resonance; the center tapped windings of said first and second converter sections being disposed on a first common winding core and said inductance feed windings of said first and second converter ...

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Номер записи: 30
13-06-2013 дата публикации

INTEGRATED RESONANCE AND POWER FACTOR CORRECTION CONTROL INTEGRATED CIRCUIT AND POWER CONVERTER

Номер: US20130148384A1
Автор: Choi Byung Ram, Han Dae Hoon, Jang Yu Jin, KIM Byung Hoon, Lee Jae Shin, Yang Jeong Mo
Принадлежит: SAMSUNG ELECTRO-MECHANICS CO., LTD.

Provided are a resonance and PFC integrated control IC and a power converter. The resonance and PFC integrated control IC includes an interleave PFC control block and a resonance control block. The interleave PFC control block is configured to control first and second switches of an interleave switching converter and correct a power factor. The interleave switching converter includes a first converter comprising the first switch and a second converter comprising the second switch, and the first converter and the second converter are connected in parallel. The resonance control block is configured to resonate and control a Direct Current (DC)-DC converter that receives and converts the output of the interleave switching converter. 1. A resonance and Power Factor Correction (PFC) integrated control Integrated Circuit (IC) , which comprises:an interleave PFC control block configured to control first and second switches of an interleave switching converter and correct a power factor, wherein the interleave switching converter comprises a first converter comprising the first switch and a second converter comprising the second switch, and the first converter and the second converter are connected in parallel; anda resonance control block configured to resonate and control a Direct Current (DC)-DC converter that receives and converts the output of the interleave switching converter.2. The resonance and PFC integrated control IC according to claim 1 , wherein the interleave PFC control block comprises:a PFC driving unit configured to drive the first and second switches;a zero-cross detecting unit configured to detect a zero-cross of power flowing in a first inductor of the first converter and a second inductor of the second converter;an interleave signal generating unit configured to receive the output of the zero-cross detecting unit and generate an interleave signal to allow the PFC driving unit to control the first and second switches; anda Pulse Width Modulation (PWM) ...

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Номер записи: 31
13-06-2013 дата публикации

AC-DC flyback converter and loop compensation method thereof

Номер: US20130148388A1
Автор: Xianhui Dong, Zhao Wang, Zhe Yang
Принадлежит: Vimicro Corp

The prevent invention provides an AC-DC flyback converter and a loop compensation method thereof. The AD-DC flyback converter comprises an isolating transformer, a power switch, and a feed control module. The feed control module includes a compensating circuit, a voltage buffer, and an error amplifier having a first resistor and a second resistor, and a pulse width modulation controller. With the AC-DC flyback converter and the loop compensating method, the system stability can be improved and the loop bandwidth can be reduced.

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Номер записи: 32
20-06-2013 дата публикации

MULTI-MODE FLYBACK CONTROL FOR A SWITCHING POWER CONVERTER

Номер: US20130154496A1
Автор: He Zhaohui, MARU Siddharth, SOOD Mohit
Принадлежит: Cirrus Logic, Inc.

In at least one embodiment, an electronic system and method includes a controller to control a switching power converter in at least two different modes of operation depending on whether the controller detects a dimmer or not and/or whether a load requests more power than either of the two operational modes can provide. In at least one embodiment, the controller detects whether a dimmer is phase cutting an input voltage to a switching power converter. The controller operates the switching power converter in a first mode if the dimmer is detected, and the controller operates the switching power converter in a second mode if the dimmer is not detected. The controller also transitions between operating the switching power converter in the first mode and the second mode if a status of detection of the dimmer changes. 1. A method comprising:detecting whether a dimmer is phase cutting an input voltage to a switching power converter;operating the switching power converter in a first mode if the dimmer is detected;operating the switching power converter in a second mode if phase cutting of the input voltage is not detected; the dimmer is not detected; andtransitioning between operating the switching power converter in the first mode and the second mode if a status of a detection of the dimmer changes.2. The method of further comprising:generating a control signal to control a switch to control a current in the switching power converter;wherein operating the switching power converter in the first mode if a dimmer is detected comprises operating the switching power converter to draw a substantially constant average input current to the switching power converter during an active time of a control signal.3. The method of wherein operating the switching power converter in the second mode if a dimmer is not detected comprises operating the switching power converter to draw an input current to the switching power converter to provide a power factor correction.4. The method of ...

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Номер записи: 33
20-06-2013 дата публикации

Isolation of Secondary Transformer Winding Current During Auxiliary Power Supply Generation

Номер: US20130155728A1
Автор: Drakshapalli Prashanth, MARU Siddharth, Melanson John L.
Принадлежит: Cirrus Logic, Inc.

An electronic system and method include a controller to actively control power transfer from a primary winding of a switching power converter to an auxiliary-winding of an auxiliary power supply. The switching power converter is controlled and configured such that during transfer of power to the auxiliary-winding, the switching power converter does not transfer charge to one or more secondary-windings of the switching power converter. Thus, the switching power converter isolates one or more secondary transformer winding currents from an auxiliary-winding current. By isolating the charge delivered to the one or more secondary-windings from charge delivered to the auxiliary-winding, the controller can accurately determine an amount of charge delivered to the secondary-windings and, thus, to a load. 1. A method comprising:transferring energy from a primary winding of a transformer of a switching power converter to a secondary-winding and to an auxiliary-winding for an auxiliary power supply during mutually exclusive periods of time by at least controlling a first value of a reflected voltage of the auxiliary-winding of the transformer to be lower than a reflected voltage of the secondary-winding of the transformer during transfer of energy to the auxiliary-winding and controlling a second value of the reflected voltage of the auxiliary-winding of the transformer to be greater than the reflected voltage of the secondary-winding of the transformer during transfer of energy to the secondary-winding.2. The method of wherein transferring energy from a primary winding of a transformer to a secondary-winding and to an auxiliary-winding of the transformer during mutually exclusive periods of time comprises:during a first period of time, transferring energy from a primary-winding of a transformer to a secondary-winding of the transformer; andduring a second period of time, actively controlling transfer of energy from the primary-winding of the transformer to the auxiliary- ...

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Номер записи: 34
20-06-2013 дата публикации

POWER SUPPLY AND IMAGE FORMING APPARATUS EQUIPPED WITH POWER SUPPLY

Номер: US20130156459A1
Автор: Kawakatsu Jun
Принадлежит: CANON KABUSHIKI KAISHA

A power supply includes a rectification unit configured to be able to switch a rectification method between a voltage doubler rectification method and a full-wave rectification method according to an input alternating voltage, two capacitive elements serially connected between lines from the rectification unit, a monitoring unit configured to monitor a first voltage applied between the lines between which the two capacitive elements are connected and a second voltage applied across one of the capacitive elements that is connected to a lower potential side of the lines, and a switch configured to operate according to the second voltage, wherein the power supply interrupts the alternating voltage according to an operating state of the switch, the first voltage, and the second voltage. 1. A power supply , comprising:a rectification unit configured to be able to switch a rectification method between a voltage doubler rectification method and a full-wave rectification method according to an input alternating voltage;two capacitive elements serially connected between lines from the rectification unit;a monitoring unit configured to monitor a first voltage applied between the lines between which the two capacitive elements are connected and a second voltage applied across one of the capacitive elements that is connected to a lower potential side of the lines; anda switch configured to operate according to the second voltage,wherein the power supply interrupts the alternating voltage according to an operating state of the switch, the first voltage, and the second voltage.2. The power supply according to claim 1 , wherein claim 1 , in a case where an overvoltage is applied across both of the capacitive elements or in a case where an overvoltage is applied to the capacitive element connected to the lower potential side claim 1 , the switch operates to interrupt the alternating voltage when the second voltage exceeds a first threshold.3. The power supply according to claim 2 , ...

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Номер записи: 35
27-06-2013 дата публикации

Regulated Controller with Self-Adjusting Output Set-Point Control

Номер: US20130163287A1
Автор: Pal Subarna, Richard Hock
Принадлежит: GENERAL ELECTRIC CO.

A power conversion system includes a power converter that converts an input voltage into a DC output voltage. Additionally, the power conversion system also includes a controller that provides a self-adjusting set-point control scheme for the power converter. A method of power conversion system operation is also provided. 1. A power conversion system , comprising:a power converter having primary and secondary stages coupled to provide an output DC voltage from an input voltage source;the power converter coupled to a controller; andthe controller having a self-adjusting set-point control scheme to generate the output DC voltage, wherein the output DC voltage follows an input voltage over a portion of an entire range of the input voltage, where the portion is based on the input voltage value.2. The system as recited in wherein the self-adjusting set-point control scheme is implemented through active regulation digital control of the power converter.3. The system as recited in wherein the self-adjusting set-point control scheme provides pulse-width modulation (PWM) control of the power converter.4. The system as recited in wherein the self-adjusting set-point control scheme automatically changes an output voltage regulation set-point of the DC output voltage as a function of the input voltage.5. The system as recited in wherein the controller is selected from the group consisting of:a local controller dedicated to the power converter; anda system controller separate from the power converter.6. The system as recited in wherein the self-adjusting set-point control scheme selects a self-adjusted set point value to nearly maximize a PWM duty cycle of the power converter.7. The system as recited in wherein the self-adjusting set-point control scheme selects a self-adjusted set point value based on an additional stored parameter that is specific to a particular power converter.8. The system as recited in wherein the self-adjusting set-point control scheme also adapts a self- ...

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Номер записи: 36
27-06-2013 дата публикации

SWITCH CIRCUIT, POWER SUPPLY DEVICE INCLUDING THE SAME, AND DRIVING METHOD THEREOF

Номер: US20130163291A1
Автор: Kim Hyunmin, MOON SangCheol, PARK Young-Bae
Принадлежит:

The present invention relates to a switch circuit, a power supply including the same, and a method for driving the power supply. When a load of the power supply represents an overload state, a sense resistor for controlling a drain current flowing through a power switch is controlled. In this instance, the sense resistor is controlled according to an on-time of the power switch. 1. A switch circuit for controlling a power supply including a power transmitting element for transmitting an input voltage that is input to a first end to a second end , comprising:a power switch; anda sense resistor for sensing a drain current flowing through the power switch, whereinwhen a load of the power supply represents an overload state, the sense resistor is controlled according to an on-time of the power switch.2. The switch circuit of claim 1 , whereinthe switch circuit detects the on-time when the load represents an overload state, and it controls the sense resistor according to the detected on-time so that a drain current of the power switch may not exceed a peak current limit corresponding to a maximum output power.3. The switch circuit of claim 2 , whereinthe switch circuit includes:an on-time detector for detecting an on-time by using a signal for controlling the power switch during the overload period; andan overload comparator for determining an overload state by using a feedback voltage corresponding to an output voltage of the power supply.4. The switch circuit of claim 3 , whereinthe overload comparator includes:a first end for receiving a reference voltage for determining the overload state; anda second end for receiving the feedback voltage, andthe overload comparator determines a period in which the feedback voltage is greater than the reference voltage to be an overload period.5. The switch circuit of claim 3 , whereinthe on-time detector detects the on-time by using a gate signal for switching the power switch during the overload period.6. The switch circuit of ...

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Номер записи: 37
04-07-2013 дата публикации

PWM CONTROL CIRCUIT, FLYBACK CONVERTER AND METHOD FOR CONTROLLING PWM

Номер: US20130169182A1
Автор: CHA Sang Hyun, Lee Chang Seok, Lee Jae Shin, Lee Yun Joong, PARK Deuk Hee
Принадлежит: SAMSUNG ELECTRO-MECHANICS CO., LTD.

Disclosed herein are a PWM control circuit, a flyback converter, and a PWM control method. The PWM control circuit includes: a peak storing and reference signal generating unit storing a peak value of one period of a feedback signal from a secondary side output and inverting the peak signal arid outputting the inverted peak signal as a reference signal; and a PWM control signal generating unit generating a PWM control signal by using an output obtained by comparing the reference signal with a reference waveform from the peak storing and reference signal generating unit. In addition, the flyback converter including the same and the method for controlling PWM are proposed. 1. A PWM control circuit , comprising:a peak storing and reference signal generating unit storing a peak value of one period of a feedback signal from a secondary side output and inverting the peak signal and outputting the inverted peak signal as a reference signal; anda PWM control signal generating unit generating a PWM control signal by using an output obtained by comparing the reference signal with a reference waveform.2. The PWM control circuit according to claim 1 , wherein the peak storing and reference signal generating unit includes: a peak detector detecting a peak value of one period of the feedback signal from the secondary side output; a sample and hold circuit storing a peak signal detected by the peak detector for one period and outputting; and an inverter inverting the peak signal output from the sample and hold circuit and outputting the inverted peak signal as the reference signal.3. The PWM control signal according to claim 1 , wherein the PWM control signal generating unit includes:a PWM comparator comparing the reference signal output from the peak storing and reference signal generating unit with the reference waveform and outputting;a zero point detector detecting a point at which an input voltage is zero by using a signal sensed from the secondary side output; anda ...

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Номер записи: 38
04-07-2013 дата публикации

METHOD AND APPARATUS FOR SENSING MULTIPLE VOLTAGE VALUES FROM A SINGLE TERMINAL OF A POWER CONVERTER CONTROLLER

Номер: US20130170251A1
Автор: Balakrishnan Balu, Djenguerian Alex B.
Принадлежит: POWER INTEGRATIONS, INC.

A controller for use in a power converter includes a sensor coupled to receive a signal from a single terminal of the controller. The signal from the single terminal represents an output voltage of the power converter during at least a portion of an off time of a power switch and a line input voltage during a portion of an on time of the power switch. A switching control is to be coupled to switch the power switch to regulate the output of the power converter in response to the sensor. A power limiter is coupled to the sensor to output a power limit signal to the switching control in response to the line input voltage of the power converter. The switching control is further coupled to switch the power switch to regulate the output of the power converter in response to the power limit signal. 1. A controller for use in a power converter , comprising:a sensor coupled to receive a signal from a single terminal of the controller, the signal from the single terminal to represent an output voltage of the power converter during at least a portion of an off time of a power switch and the signal from the single terminal to represent a line input voltage during a portion of an on time of the power switch;a switching control to be coupled to switch the power switch to regulate the output of the power converter in response to the sensor; anda power limiter coupled to the sensor to output a power limit signal to the switching control in response to the line input voltage of the power converter, wherein the switching control is further coupled to switch the power switch to regulate the output of the power converter in response to the power limit signal.2. The controller of wherein the power limiter is further coupled to receive a current sense signal from a current sensor claim 1 , wherein the current sense signal is generated in response to a switch current in the power switch claim 1 , wherein the power limiter is further coupled to output the power limit signal in response to ...

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Номер записи: 39
04-07-2013 дата публикации

ELECTRIC POWER SUPPLY APPARATUS

Номер: US20130170252A1
Автор: Kidera Kazunori, Nishi Mariko, NISHINO Hiroyuki
Принадлежит: Panasonic Corporation

An electric power supply apparatus, which enables a driving frequency of a switching circuit connected to a primary side of a transformer constant and output of a secondary side variable, comprises a transformer (), a series circuit of two first switching elements (Q, Q) connected between terminals of a direct current power supply (), an LC resonant circuit connected between both ends of one of the first switch element (Q) and a primary winding (Np) of the transformer (), bidirectional switch elements (Q, Q) connected to secondary windings (Ns, Ns) of the transformer () and having a rectification function and a phase control function, and a control circuit for inputting gate driving signals having a phase difference into the first switch elements (Q, Q) and the second switch elements (Q, Q). 1. A variable output type electric power supply apparatus comprising a multi-resonant type half bridge converter , whereinthe multi-resonant type half bridge converter comprises:a transformer;a series circuit of two of first switch elements connected between terminals of a direct current electric power supply;an LC resonant circuit connected between both terminals of one of the first switch elements and a primary winding of the transformer;bidirectional second switch elements connected to secondary windings of the transformer and having rectification function and phase control function; anda control circuit which inputs gate driving signals each having phase differences to the first switch elements and the second switch elements, andoutputs from the secondary windings of the transformer are variable.2. The electric power supply apparatus in accordance with claim 1 , whereinthe second switch element has two channels of a forward direction and a reverse direction with respect to an electric current flowing in the secondary winding of the transformer and a first gate and a second gate corresponding thereto; andthe control circuit realizes the phase control function by inputting ...

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Номер записи: 40
04-07-2013 дата публикации

AUXILIARY POWER GENERATION CIRCUIT

Номер: US20130170253A1
Автор: USHIJIMA Masakazu
Принадлежит:

An auxiliary power generation circuit adopted for use on a filter power circuit includes a first voltage stabilization capacitor and a second voltage stabilization capacitor connecting to the first voltage stabilization capacitor via a first diode. The first and second voltage stabilization capacitors form a capacitor voltage division circuit. The first voltage stabilization capacitor and first diode are bridged by a first connection point which is connected to a short circuit element and a second diode with a set on current opposite to the short circuit element. The short circuit element has a control end connecting to a first Zener diode which is connected to a first resistor with a desired resistance. The first resistor is connected to a second connection point between the second voltage stabilization capacitor and first diode. 1. An auxiliary power generation circuit used on a filter power circuit consisting of a main duty power output end and a ground end , characterized in that the main duty power output end connecting to a first voltage stabilization capacitor , a first diode connecting to another end of the first voltage stabilization capacitor opposing the main duty power output end and a second voltage stabilization capacitor connecting to the first voltage stabilization capacitor through the first diode , the second voltage stabilization capacitor having another end opposing the first diode and connecting to the ground end , the first and second voltage stabilization capacitors forming a capacitor voltage division circuit , the first and second voltage stabilization capacitors being interposed by a first connection point connected to a short circuit element which contains a control end set on to form a short circuit with the ground end and a second diode set on by a current opposite to the short circuit element , the short circuit element being connected to a first Zener diode via the control end , the first Zener diode containing another end opposing the ...

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Номер записи: 41
04-07-2013 дата публикации

POWER SUPPLY DEVICE PERFORMING VOLTAGE CONVERSION

Номер: US20130170850A1
Автор: INUKAI Katsumi, MARUYAMA Tsuyoshi
Принадлежит: BROTHER KOGYO KABUSHIKI KAISHA

In a power supply device, the controller outputs a control signal specifying a voltage value. The voltage conversion unit converts a first voltage to a second voltage in response to a control signal specifying a voltage value output from the controller. The voltage conversion unit converts the first voltage to a start voltage, as the second voltage, in response to a first control signal specifying a start voltage value output from the controller and further converts the first voltage to a target voltage, as the second voltage, in response to a second control signal specifying a target voltage value output from the controller. A transition period of time is intervened between generation of the start voltage and generation of the target voltage during which the controller outputs a third control signal specifying the intermediate voltage value between the start voltage value and the target voltage value. 1. A power supply device comprising:a first voltage generating unit configured to generate a first voltage;a controller configured to output a control signal specifying a voltage value; anda voltage conversion unit configured to convert the first voltage to a second voltage in response to a control signal specifying a voltage value output from the controller, and output the second voltage,wherein the voltage conversion unit converts the first voltage to a start voltage, as the second voltage, in response to a first control signal specifying a start voltage value output from the controller and further converts the first voltage to a target voltage, as the second voltage, in response to a second control signal specifying a target voltage value output from the controller,wherein a transition period of time is intervened between generation of the start voltage and generation of the target voltage during which the controller outputs a third control signal specifying the intermediate voltage value between the start voltage value and the target voltage value.2. The power ...

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Номер записи: 42
18-07-2013 дата публикации

BULK ACOUSTIC WAVE RESONATOR

Номер: US20130181579A1
Автор: Jing Cui, KIM Chul Soo, Kim Duck Hwan, Lee Moon Chul, PARK Ho Soo, Shin Jea Shik, SON Sang Uk, Song In Sang
Принадлежит:

Provided is a bulk acoustic wave resonator (BAWR). The BAWR may include an air cavity disposed on a substrate, a bulk acoustic wave resonant unit including a piezoelectric layer, and a reflective layer to reflect a wave of a resonant frequency that is generated from the piezoelectric layer. 1. A bulk acoustic wave resonator (BAWR) , comprising:a bulk acoustic wave resonant unit comprising a first electrode, a second electrode, and a piezoelectric layer disposed between the first electrode and the second electrode; anda reflective layer to reflect a resonant frequency that is generated from the piezoelectric layer due to a signal applied to the first electrode and the second electrode.2. The BAWR of claim 1 , further comprising a substrate and an air cavity disposed above the substrate claim 1 , wherein the reflective layer is disposed on the air cavity and below the bulk acoustic wave resonant unit.3. The BAWR of claim 2 , wherein the reflective layer comprises:a first reflective layer disposed below the bulk acoustic wave resonant unit; anda second reflective layer disposed below the first reflective layer and on the air cavity, and comprising a higher acoustic impedance than the first reflective layer.4. The BAWR of claim 3 , wherein the first reflective layer comprises at least one of a silicon oxide-based material claim 3 , a silicon nitride-based material claim 3 , an aluminum oxide-based material claim 3 , and an aluminum nitride-based material.5. The BAWR of claim 3 , wherein each of the first reflective layer and the second reflective layer comprises a thickness of approximately ¼ of a wavelength of the resonant frequency.6. The BAWR of claim 1 , wherein the reflective layer comprises at least one of material having a temperature coefficient of frequency (TCF) that has a sign that is opposite to a sign of a TCF of the bulk acoustic wave resonant unit.7. The BAWR of claim 1 , wherein the reflective layer comprises a material having a TCF claim 1 , anda sum of ...

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Номер записи: 43
18-07-2013 дата публикации

LED Driver with Primary Side Sensing

Номер: US20130181635A1
Автор: LING Hok-Sun
Принадлежит: TEXAS INSTRUMENTS INCORPORATED

The disclosed switching regulator, including a controller for a switching regulator, is adaptable to supplying, or controlling the supply of, regulated current to a load that is isolated from a source of input power by a flyback transformer, and includes: (a) detecting, after transistor SW, a zero crossing ZCD corresponding to a primary side switching node voltage Vdecreasing to the input voltage Vin, which occurs after a secondary current Iis substantially zero and before the next SW; (c) establishing a time-integral window T-I_W with a leading edge corresponding to SWand a trailing edge corresponding to ZCD; and (d) modulating at least the time SWFrelative to SWbased on the primary peak current Iat SWand the time-integral window, such that a regulated load current is supplied to the load. 1. A circuit for controlling a switching regulator including a flyback transformer with primary and secondary windings and a switching transistor coupled to the primary side winding at a switching node SW , and configured to supply regulated current to a load that is isolated from a source of input power by the flyback transformer , the circuit comprising{'sub': ON', 'OFF', 'P', 'ON', 'PP', 'OFF', 'S', 'SP', 'OFF', 'ON, 'controller circuitry configured to switch the transistor on at a time SW and off at a time SW, such that a primary current Ithrough the primary side winding increases from substantially zero at SWto a primary peak current Iat SW, thereby inducing in the secondary side winding a secondary current Ithat decreases from a peak current Iat SWto substantially zero before the transistor is switched on at a next SW, in accordance with discontinuous conduction mode operation;'}{'sub': OFF', 'SW', 'IN', 'ON, 'a zero crossing detect circuit configured to detect, after SW, a zero crossing ZCD corresponding to a voltage Vat the primary side switching node SW decreasing in magnitude to an input voltage V, which occurs after the secondary current k is substantially zero and ...

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Номер записи: 44
18-07-2013 дата публикации

DC Converter With Low Starting Voltage

Номер: US20130182464A1
Автор: WOIAS Peter
Принадлежит: ALBERT-LUDWIGS-UNIVERSITAT FREIBURG

The present invention relates to an electronic circuit with which input voltages at an input of the circuit are converted into higher output voltages at an output of the circuit, whereby the voltage conversion already starts at low voltages at the input. According to the present invention, the DC converter circuit for the generation of an output voltage from an input voltage (V) comprises a transformer (Tr) with a first primary winding () that can be connected to the input voltage (V) via a first transistor (T) that is connected in series, and a second primary winding () that can be connected to the input voltage (V) via a second transistor (T) that is connected in series. The transformer (Tr) furthermore has at least one secondary winding () that has a higher number of windings than the first and the second primary winding () and that is connected to control inputs of the first and second transistor (T T), as well as to an output terminal of the DC converter circuit for the output of the output voltage (V). 1. DC converter circuit for the generation of an output voltage from an input voltage (V) , comprising:{'b': 1', '2, 'sub': in', '1', 'in', '2, 'a transformer (Tr) with a first primary winding (), which can be connected to the input voltage (V) via a first transistor (T) that is connected in series, and a second primary winding (), which can be connected to the input voltage (V) via a second transistor (T) that is connected in series,'}{'b': 3', '4', '1', '2, 'sub': 1', '2', 'out, 'wherein the transformer (Tr) furthermore has at least one secondary winding (, ) that has a larger number of windings than the first and the second primary winding (, ), and that is connected to the control inputs of the first and second transistor (T, T) as well as to an output terminal of the DC converter circuit for the output of the output voltage (V).'}234. DC converter circuit according to claim 1 , wherein the transformer (Tr) has a first secondary winding () that is connected ...

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Номер записи: 45
25-07-2013 дата публикации

ENHANCED FLYBACK CONVERTER

Номер: US20130188400A1
Автор: Wang Jin, Zhang Xuan, Zou Ke
Принадлежит: The Ohio State University

A DC/DC flyback converter that exhibits reduced switch and transformer voltage stresses in comparison to known flyback converters. The flyback converter also employs soft switching. Embodiments of such flyback converters may be used, without limitation, in electric vehicles and hybrid electric vehicles. A front-stage of the flyback converter comprises a DC/AC step-down circuit that may be separately used for various purposes. 1. A flyback DC/DC converter , comprising:a circuit having a high-voltage side and a low-voltage side separated by a transformer;a plurality of switches on the high-voltage side and a plurality of switches on the low-voltage side;a plurality of components that are adapted to store energy in an electric field on the high-voltage side, and at least one such component on the low-voltage side;at least one component that is adapted to store energy in a magnetic field on the low-voltage side;wherein, the switches are actuatable in various combinations at a selected switching frequency to produce both active modes and deadband modes of operation within a given switching period; andwherein the at least one component that stores energy in a magnetic field is adapted to store energy only in active modes when an associated high-voltage side switch is turned on, and to release energy to a load only in deadband modes when the associated high-voltage side switch is turned off.2. The flyback converter of claim 1 , wherein the switches are passive and active power devices.3. The flyback converter of claim 1 , wherein:a pair of components adapted to store energy in a magnetic field are present on the low-voltage side;a pair of switches are located on the high-voltage side, each of the switches corresponding to a given one of the components adapted to store energy in a magnetic field;wherein, when one of the switches is on, a corresponding one of the magnetic field energy storing components is adapted to store energy, and when the same switch is off, the same ...

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Номер записи: 46
01-08-2013 дата публикации

VIBRATOR ELEMENT, VIBRATING DEVICE, PHYSICAL QUANTITY DETECTING DEVICE, AND ELECTRONIC APPARATUS

Номер: US20130192367A1
Автор: ISONO Yuichi, Kikuchi Takayuki, KIKUSHIMA Masayuki, Osawa Seiji, Yamaguchi Keiichi
Принадлежит: SEIKO EPSON CORPORATION

A first support portion, which is connected to a first beam extending from a vibrating body and supports the vibrating body, and a detection signal terminal and a detection ground terminal, which are provided in the first support portion and are arranged in parallel so as to be separated from each other along a direction crossing an extending direction of the first beam, are provided. The first beam and the first support portion are connected between the detection signal terminal and the detection ground terminal. A thin portion formed to have a small thickness in a top to bottom direction of the first support portion or a penetrating portion formed by removing the first support portion so as to be penetrated in the top to bottom direction is provided between the detection signal terminal and the detection ground terminal. 1. A vibrator element comprising:a vibrating body;a support portion that is connected to a beam extending from the vibrating body and that supports the vibrating body; andat least two fixing portions that are provided in the support portion and that are arranged in parallel so as to be separated from each other along a direction crossing an extending direction of the beam,wherein the beam and the support portion are connected between the two fixing portions, anda thin portion formed to have a thickness in a top to bottom direction of the support portion, which is smaller than a thickness of a portion in which the fixing portions of the support portion are provided, or a penetrating portion, which is formed by removing the support portion so as to be penetrated in the top to bottom direction, is provided between the two fixing portions.2. The vibrator element according to claim 1 ,wherein the support portion includes a narrow portion which extends from the beam to each of the two fixing portions and in which a width of the support portion is smaller than a width of the portion in which the fixing portions of the support portion are provided.3. The ...

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Номер записи: 47
01-08-2013 дата публикации

SWITCHING POWER SUPPLY

Номер: US20130194827A1
Автор: Chen Jian
Принадлежит: FUJI ELECTRIC CO., LTD.

A switching power supply of certain aspects of the invention includes a minimum dead time generating circuit that generates a minimum dead time from an OFF timing of an ON pulse detected from the voltage across an auxiliary winding of the transformer by a differentiating circuit. An ON width-determining means of a voltage control oscillator is started, after this minimum dead time, into operation to determine the ON width of the semiconductor switch. 1. A switching power supply comprising:a transformer having a primary winding, a secondary winding, and a auxiliary winding, the auxiliary winding being disposed in a primary side of the transformer and detecting variation in a voltage across the primary winding;a series-connected circuit including a first semiconductor switch and a second semiconductor switch, the series connected circuit being connected in parallel to a DC power source;a series-connected resonance circuit including series-connected components of a resonance capacitor, an inductance element of at least one of a resonance reactor or a leakage inductance of the transformer, and the primary winding of the transformer;a differentiating circuit for detecting a timing of an inversion beginning timing or an inversion ending timing of the voltage detected by the auxiliary winding after receiving a first trigger signal for turning OFF of the first semiconductor switch or the second semiconductor switch;a dead time adjusting circuit for generating a second trigger signal at a timing of turn ON the first semiconductor switch or the second semiconductor switch delaying a predetermined time period from the timing detected by the differentiating circuit; anda voltage control oscillator including an ON width determining means that comprises a minimum dead time-generating circuit for generating a minimum dead time on receiving the first trigger signal and starts up operation to determine an ON width of the first semiconductor switch or the second semiconductor switch ...

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Номер записи: 48
01-08-2013 дата публикации

INVERTER OUTPUT RECTIFIER CIRCUIT

Номер: US20130194828A1
Автор: KRUEGER MATTHEW JON, LUO LIFENG LARRY
Принадлежит: LINCOLN GLOBAL, INC.

In a power source of a welding system, an inverter rectifier output circuit and method for reducing the blocking voltages across saturable reactors associated with a rectifier coupled to a transformer winding in the inverter rectifier output circuit during both turn-on and turn-off transitions of the rectifier. At least a portion of a reverse recovery current associated with the rectifier is blocked by allowing blocking voltages to build across associated saturable reactors during a transition phase of the rectifier. During a turn-off portion of the transition phase, the blocking voltages are reduced using a RC circuit, thereby suppressing a peak voltage associated with the rectifier. During a turn-on portion of the transition phase, the blocking voltages are reduced using another saturable reactor in series with a free-wheeling diode. 1. An inverter rectifier output circuit , said circuit comprising:a secondary winding of a transformer, said secondary winding having a first node, a second node, and a center tap node;a first saturable reactor connected to said first node;a first rectifying diode connected in series with said first saturable reactor at an anode of said first rectifying diode;a second saturable reactor connected to said second node;a second rectifying diode connected in series with said second saturable reactor at an anode of said second rectifying diode;a third saturable reactor connected to said center tap node;a free-wheeling diode connected in series with said third saturable reactor at an anode of said free-wheeling diode;a first series RC network connected between said anode of said first rectifying diode and said anode of said free-wheeling diode;a second series RC network connected between said anode of said second rectifying diode and said anode of said free-wheeling diode;a first output node defined by connected cathodes of said first rectifying diode, said second rectifying diode, and said free-wheeling diode; anda second output node ...

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Номер записи: 49
01-08-2013 дата публикации

RESONANT CONVERTER WITH AUXILIARY RESONANT COMPONENTS AND HOLDUP TIME CONTROL CIRCUITRY

Номер: US20130194831A1
Автор: Hu Gordon Zongbo
Принадлежит: Power-One, Inc.

A resonant power converter is provided with auxiliary circuit branches and control circuitry for switchably coupling the auxiliary branches to resonant circuit components during holdup times. Auxiliary branches are coupled in parallel with any one or more of a resonant inductor, a resonant capacitor, and a magnetizing inductive winding via respective switches. When a holdup time condition is detected in accordance with, for example, a drop in the mains line voltage, the switches are controlled to adjust the corresponding inductance or capacitance for the duration of the holdup time condition or otherwise for a predetermined duration. The power converter in normal operation is configured for high efficiency and in a holdup time operation is configured to produce sufficient holdup time. 1. A resonant power converter comprising:an input power conversion switching circuit comprising a plurality of power conversion switches coupled to a line voltage input to the power converter;a series resonant circuit coupled to an output side of the power conversion switching circuit and comprising a resonant inductance circuit, a resonant capacitance circuit, and a magnetizing inductance circuit;wherein at least one of the resonant inductance circuit, the resonant capacitance circuit, and the magnetizing inductance circuit in the series resonant circuit further comprise at least first and second circuit branches and a switch controllable to regulate an inductance or capacitance value corresponding to the respective circuit; and detect a holdup time condition associated with a line voltage failure, and', 'generate control signals to adjust a switch state for the switch in the series resonant circuit in accordance with determining a first operating mode associated with the holdup time condition or a second operating mode associated with normal operation of the converter., 'a control circuit effective to'}2. The resonant power converter of wherein the resonant inductance circuit ...

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Номер записи: 50
01-08-2013 дата публикации

CONVERTER DRIVING CIRCUIT, DUAL-MODE LLC RESONANT CONVERTER SYSTEM, AND METHOD OF DRIVING DUAL-MODE LLC RESONANT CONVERTER

Номер: US20130194832A1
Автор: Choi Joong Ho, Gong Jung Chul, Han Dae Hoon, Jang Yu Jin, Kim Hong Jin, Lee Jae Shin, Lee Joo Hyung, Lee Kang Yoon
Принадлежит:

Disclosed herein are a converter driving circuit for adjusting a variable range of a driving control voltage according to an amplitude and frequency change of a feedback voltage, a dual-mode LLC resonant converter system, and a method of driving the dual-mode LLC resonant converter. 1. A converter driving circuit for driving a dual-mode LLC resonant converter , the converter driving circuit comprising:a feedback voltage sensing unit that feed-back a voltage output from the dual-mode LLC resonant converter;a driving control voltage generating unit that is connected to the feedback voltage sensing unit and generates a driving control voltage by using the feedback voltage;a driving control voltage limit variable setting unit that is connected to the driving control voltage generating unit and generates an upper limit voltage and a lower limit voltage that limit a variable range of the driving control voltage; anda clock generating unit that is connected to the driving control voltage generating unit, receives the driving control voltage, and generates switch control signals for respectively controlling on/off of switches of the dual-mode LLC resonant converter,wherein the upper limit voltage and the lower limit voltage vary by reflecting a change in the driving control voltage.2. The converter driving circuit according to claim 1 , wherein the driving control voltage limit variable setting unit includes:a limit voltage generating unit that receives a limit determining voltage and generates the upper limit voltage and the lower limit voltage;a control current generating unit that receives the limit determining voltage as feedback and generates a control current;a control frequency signal generating unit that is connected to the control current generating unit, compares the control current with the driving control voltage, and generates a control frequency signal;a reference frequency signal generating unit that generates a reference frequency signal; anda limit ...

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Номер записи: 51
01-08-2013 дата публикации

POWER SYSTEM WITH SHARED CLAMP RESET

Номер: US20130194834A1
Автор: Mayell Robert J.
Принадлежит: POWER INTEGRATIONS, INC.

An example power supply includes a first power converter, a second power converter, and a shared clamp reset circuit. The first power converter is adapted to convert an input to a first voltage output and includes a first diode and a first transformer having a first primary winding. The second power converter is adapted to convert the input to a second voltage output and includes a second diode and a second transformer having a second primary winding. The shared clamp reset circuit is included in the first power converter and is coupled to the cathode of the first diode. The shared clamp reset circuit also includes a clamp connection that is coupled to the cathode of the second diode. The shared clamp reset circuit is adapted to manage leakage inductance energy within the first transformer and within the second transformer. 1. A power supply , comprising: a first transformer having a first primary winding; and', 'a first diode having an anode coupled to the first primary winding;, 'a first power converter adapted to convert an input to a first voltage output, the first power converter including a second transformer having a second primary winding; and', 'a second diode having an anode coupled to the second primary winding; and, 'a second power converter adapted to convert the input to a second voltage output, the second power converter includinga shared clamp reset circuit included in the first power converter and coupled to a cathode of the first diode, wherein the shared clamp reset circuit includes a clamp connection coupled to a cathode of the second diode, and wherein the shared clamp reset circuit is adapted to manage leakage inductance energy within the first transformer and within the second transformer.2. The power supply of claim 1 , wherein the second power converter is adapted to remain powered up while the first power converter is powered down.3. The power supply of claim 1 , wherein the first power converter further comprises circuitry arranged in a ...

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Номер записи: 52
01-08-2013 дата публикации

FLYBACK CONVERTER WITH FORWARD CONVERTER RESET CLAMP

Номер: US20130194835A1
Автор: Mayell Robert J.
Принадлежит: POWER INTEGRATIONS, INC.

A power supply includes a forward converter having a first transformer coupled to an input of the power supply and to a first voltage output. The power supply also includes a separate flyback converter having a second transformer that is coupled to the input and to a second voltage output. A clamp reset circuit is coupled to the first transformer and to the second transformer. The clamp reset circuit includes a capacitor and a voltage limiting element. The voltage limiting element is coupled to prevent energy received at the capacitor from both the power converters from exceeding a threshold. The voltage limiting element limits a voltage on the capacitor. 1. A power supply , comprising:a first power converter having a first set of circuit components arranged in a forward converter topology, the first set of circuit components including a first transformer coupled to an input and to a first voltage output of the power supply;a second power converter having a second set of circuit components arranged in a flyback converter topology, the second set of circuit components including a second transformer coupled to the input and to a second voltage output of the power supply; and a capacitor coupled to store energy received from the first power converter and the second power converter; and', 'a voltage limiting element coupled to the capacitor to prevent the energy received from both the first power converter and the second power converter from exceeding a threshold, wherein the voltage limiting element limits a voltage on the capacitor., 'a clamp reset circuit coupled to the first transformer and to the second transformer, the clamp reset circuit comprising2. The power supply of claim 1 , wherein the clamp reset circuit is further coupled to reduce magnetizing energy in the first transformer of the first power converter.3. The power supply of claim 1 , wherein the clamp reset circuit is further coupled to limit voltage on a component of the second power converter.4. The ...

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Номер записи: 53
01-08-2013 дата публикации

CONTROL CIRCUIT AND METHOD FOR A FLYBACK CONVERTER TO COMPENSATE FOR AN ENTRY POINT OF A BURST MODE

Номер: US20130194837A1
Автор: HUANG Pei Lun, LIN Tzu Chen
Принадлежит: RICHTEK TECHNOLOGY CORP.

A control circuit and method are provided for a flyback converter converting an input voltage to an output voltage, to compensate for an entry point of a burst mode of the flyback converter, so that the entry point is not affected by the input voltage, and audible noise resulted from a higher input voltage is reduced without impacting the light load efficiency of the flyback converter. 1. A control circuit for a flyback converter including a transformer connected with a power switch switched by a control signal for the transformer to convert an input voltage into an output voltage , the control circuit comprising:a compensator compensating a feedback signal with a sawtooth wave to generate a compensated feedback signal, the sawtooth wave independent of the input voltage, the feedback signal being a function of the output voltage; anda pulse width modulation circuit connected to the compensator to generate the control signal according to the compensated feedback signal and a current sense signal, the current sense signal being a function of a current flowing through the power switch.2. The control circuit of claim 1 , wherein the pulse width modulation circuit comprises:a comparator connected to the compensator to compare the compensated feedback signal with the current sense signal to generate a comparison signal; anda flip-flop connected to the comparator to generate the control signal according to the comparison signal and a clock.3. The control circuit of claim 1 , wherein the compensator comprises an adder having a positive input to receive the feedback signal claim 1 , a negative input to receive the sawtooth wave claim 1 , and an output to provide the compensated feedback signal.4. The control circuit of claim 1 , further comprising a burst circuit to determine whether to control the flyback converter to enter a burst mode according to the feedback signal and a preset value.5. The control circuit of claim 4 , wherein the burst circuit comprises a comparator to ...

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Номер записи: 54
08-08-2013 дата публикации

LOW-VOLUME PROGRAMMABLE-OUTPUT PFC RECTIFIER WITH DYNAMIC EFFICIENCY AND TRANSIENT RESPONSE OPTIMIZATION

Номер: US20130201729A1
Автор: Ahsanuzzaman Sheikh Mohammad, Prodic Aleksandar
Принадлежит:

The present invention is a system, apparatus and method of a PFC rectifier having a programmable output voltage that does not incur a drastic penalty in the overall size or volume of the device, or a significant degradation in efficiency. The PFC rectifier of the present invention may incorporate a two-stage solution for output voltage regulation. The present invention provides a topology of a small-size/volume PFC rectifier with a variable (i.e. programmable) output voltage and a complementary control method. The two-stage system of the present invention incorporates a smaller and lower cost capacitor than the bulky size and costly energy storage capacitors required in conventional prior art. The present invention also achieves tight output regulation. The two-stage topology of the present invention further achieves on-line efficiency optimization and significantly reduces the volume of the downstream stage over the prior art examples through dynamic adjustment of the downstream stage supply voltage. 1) A PFC rectifier with a programmable output voltage operable to reduce the size or volume of a converter in a downstream stage of the PFC rectifier , comprising: i) the top capacitor is operable to store energy at a sufficiently high voltage to provide hold up time and increase a current slew rate during transients to provide a fast dynamic transient response; and', 'ii) the bottom capacitor is operable to dynamically adjust on-line power processing and regulate the efficiency of a downstream stage of the PEG rectifier; and, 'a) a front converter incorporated in a front stage, and said front converter incorporating a non symmetric capacitive divider incorporating a top capacitor and a bottom capacitor, whereinb) a buck converter incorporated in the downstream stage.2) The PFC rectifier of claim 1 , wherein the non symmetric capacitive divider incorporates independently controllable tap voltages claim 1 , such that the voltages are dynamically controllable.3) The PEG ...

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Номер записи: 55
08-08-2013 дата публикации

Alternating Parallel Fly Back Converter with Alternated Master-Slave Branch Circuits

Номер: US20130201730A1
Автор: Luo Yuhao
Принадлежит: ALTENERGY POWER SYSTEM, INC.

An alternating parallel flyback converter with alternated master and slave circuit branches is provided. The flyback converter includes a master flyback circuit branch, a slave flyback circuit branch connected with the master flyback circuit branch in parallel, and a controller. The controller controls the operation of each of the flyback circuit branches based on the current and the voltage at the output terminal of the flyback converter. The master flyback circuit branch operates continuously while the slave flyback circuit branch only operates when the output power of the flyback converter is higher than a threshold. The master flyback circuit branch and the slave flyback circuit branch are periodically alternated, and in particular, through zero crossing of the power. With the flyback converter of the present invention, the reliability and the service life of the converter can be improved. 1. An alternating parallel flyback converter with alternated master-slave branch circuits , comprising:a plurality of flyback circuits connected in parallel;an output current detector for detecting an output current at an output terminal of said alternating parallel flyback converter;an output voltage detector for detecting an output voltage at an output terminal of said alternating parallel flyback converter; anda controller, coupled to said output current detector and said output voltage detector, and coupled to a switch of each of the plurality of flyback circuits, for controlling operation of each flyback circuit based on detected output current and output voltage; a portion of the plurality of flyback circuits being set as master branch circuits, and the remaining portion of the plurality of flyback circuits being set as slave branch circuits, wherein said master branch circuits operate continuously under the control of said controller, and said slave branch circuits only operate when a power at the output terminal of said alternating parallel flyback converter is higher ...

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Номер записи: 56
08-08-2013 дата публикации

POWER FACTOR CORRECTION DEVICE, AND CONTROLLER AND THD ATTENUATOR USED BY SAME

Номер: US20130201731A1
Автор: Gu Wenhao, Guo Lifang, Tan Runqin
Принадлежит: FREMONT MICRO DEVICES(SHENZHEN) LIMITED

A power factor correction device, and a controller and a total harmonic distortion (THD) attenuator used by same. The power factor correction device comprises a converter and a controller () connected to the converter to obtain an input voltage. The controller () comprises a THD attenuator () for automatic THD optimization. The converter comprises an input current detection resistor (R), a power switch tube (NMOS) and an output circuit. The input current detection resistor (R), the power switch tube (NMOS) and the output circuit form a feedback control loop to maintain a constant output voltage. A THD optimization function is built in the device so that the entire device is capable of being accurately offset to a designed voltage so as to be used for THD optimization, thereby dispensing with external manual adjustment and overcoming internal technical deviations while achieving high consistency. 1. A power factor correction device comprising a converter and a controller coupled to the converter to obtain an input voltage , wherein , the controller comprises a THD reducer capable of achieving an automatic THD optimization , the converter comprises an input current sense resistor , a power switch tube and an output circuit , wherein , the input current sense resistor , power switch tube and output circuit form a feedback control loop to maintain a constant output voltage level.2. The power factor correction device according to claim 1 , wherein claim 1 , the converter further comprises:a bridge rectifier connected to an AC voltage to have a rectified sinusoidal voltage,a rectified main voltage divider connected to the bridge rectifier to scale down the rectified sinusoidal voltage such that a scale-down rectified sinusoidal voltage is provided to the controller.3. The power factor correction device according to claim 2 , wherein claim 2 , the output circuit comprises an output diode claim 2 , an output voltage divider and an output filtering capacitor claim 2 , ...

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Номер записи: 57
15-08-2013 дата публикации

Method for controlling a series resonant DC/DC converter

Номер: US20130208512A1
Автор: Backman Nils, Rojas Roberto
Принадлежит:

The invention relates to a method for controlling a series resonant DC/DC converter. The method comprises the steps of: defining a switching period TP having a first half period TA and a second half period TB and defining a subsequent switching period TP+1 after the switching period TP. In a next step, a first set (Ssc; Ssc, Ssc) of switches of a first switching circuit (SC) is controlled to be ON from the beginning Tstart of the first half period TA minus a time interval ΔTAE, where the time interval ΔTAE is provided at the end of the first half period TA and a second set (Ssc; Ssc, Ssc) of switches of the first switching circuit (SC) is controlled to be ON from the beginning Tcenter of the second half period TB minus a time interval ΔTBE, where the time interval ΔTBE is provided at the end of the second half period TB. A first set (Ssc; Ssc, Ssc) of switches of a second switching circuit (SC) is controlled to be ON in the first half period TA minus a time interval ΔTAS and minus a time interval ΔTAE, where the time interval ΔTAS is provided at the beginning of the first half period TA and where the time interval ΔTAE is provided at the end of the first half period TA and a second set (Ssc; Ssc, Ssc) of switches of the second switching circuit (SC) is controlled to be ON in the second half period TB minus time interval ΔTBS and minus time interval ΔTBE, where the time interval ΔTBS is provided at the beginning of the second half period TB and where the time interval ΔTBE is provided in the end of the second half period TB. Time intervals Tscoff and Tscoff, and time intervals Tscoff and Tscoff, where the sets of the first and second switching circuits all are off, are at least partially overlapping. 211211222. Method according to claim 1 , where the method comprises the step of controlling the centre of interval Tscoff to be close to or equal to the centre of time interval Tscoff and the centre of interval Tscoff to be close to or equal to the centre of time ...

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Номер записи: 58
15-08-2013 дата публикации

Circuit for a Switched Mode Power Supply

Номер: US20130208513A1
Автор: GERME Michel, Uguen Emeric
Принадлежит: NXP B.V.

A circuit for a switched mode power supply having a winding. The circuit comprising: an input configured to receive a winding voltage derived from the winding; a differentiation element configured to differentiate the winding voltage with respect to time in order to determine a derivative signal and compare the derivative signal with a threshold value; a steady state detector configured to set a zero derivative signal when the derivative signal has not exceeded the threshold value for a predetermined period of time, and a logic arrangement configured to identify an end of a demagnetization stroke of the switched mode power supply when the derivative signal crosses a final threshold value after the zero derivative signal has been set. 1. A circuit for a switched mode power supply having a winding , the circuit comprising:an input configured to receive a winding voltage derived from the winding;a differentiation element configured to differentiate the winding voltage with respect to time in order to determine a derivative signal and compare the derivative signal with a threshold value;a steady state detector configured to set a zero derivative signal when the derivative signal has not exceeded the threshold value for a predetermined period of time, anda logic arrangement configured to identify an end of a demagnetization stroke of the switched mode power supply when the derivative signal crosses a final threshold value after the zero derivative signal has been set.2. The circuit of claim 1 , wherein the switched mode power supply is a flyback converter and the winding is a winding at a primary side of a flyback transformer.3. The circuit of claim 2 , wherein the winding voltage is the voltage at the drain of a power switch of the flyback converter.4. The circuit of wherein the final threshold value (is the same as the threshold value.5. The circuit of claim 1 , wherein the threshold value is a negative threshold value claim 1 , and the differentiation element is ...

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Номер записи: 59
15-08-2013 дата публикации

PIEZOELECTRIC VIBRATING PIECE, PIEZOELECTRIC VIBRATOR, OSCILLATOR, ELECTRONIC DEVICE, AND RADIO-CONTROLLED TIMEPIECE

Номер: US20130208573A1
Автор: Arimatsu Daishi
Принадлежит: SEIKO INSTRUMENTS INC.

Provided are a piezoelectric vibrating piece, a piezoelectric vibrator, an oscillator, an electronic device, and a radio-controlled timepiece which can effectively suppress the vibration leakage while maintaining sufficient rigidity of the piezoelectric vibrating piece without making the piezoelectric vibrating piece large-sized. A chamfered portion is formed on corner portions of a connecting portion on a narrow width portion side on both sides in the widthwise direction (Y direction). Due to such chamfered portions, a cross-sectional area (width size) of the connecting portion is gradually reduced toward the narrow width portion from a distal end side (vibrating arm portion side). The chamfered portion may be formed such that an angle θ with respect to side surfaces on both sides of the connecting portion becomes 60° (θ=60°). 1. A piezoelectric vibrating piece comprising:a pair of vibrating arm portions parallel to each other and extending in a longitudinal direction and having proximal end sides; and a connecting portion having a length in a widthwise direction orthogonal to the longitudinal direction and having the proximal end sides of the vibrating arm portion fixed thereto;', 'a mount portion having a length in a widthwise direction orthogonal to the longitudinal direction and configured to mount the base portion; and', 'a narrow width portion between the connecting portion and the mount portion and having a length thereof in a widthwise direction orthogonal to the longitudinal direction that is smaller than the length of the connecting portion and the length of the mount portion,', 'wherein the connecting portion further includes a width reducing portion having cut away opposing side surfaces extending inwardly toward the narrow width portion and angled with respect to the longitudinal direction such that a length in the widthwise direction is progressively reduced along the longitudinal direction toward the narrow width portion., 'a base portion including2. ...

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Номер записи: 60
22-08-2013 дата публикации

VARIABLE TIME CLAMP FOR A POWER SUPPLY CONTROLLER

Номер: US20130215650A1
Автор: Lund Leif
Принадлежит: POWER INTEGRATIONS, INC.

An example integrated circuit for use in a power supply includes a feedback terminal, a controller and a clamp. The feedback terminal is to be coupled to receive a feedback signal that is representative of a bias voltage across a bias winding of the power supply. The controller is to be coupled to control switching of a power switch included in the power supply in response to the feedback signal. The clamp is coupled to clamp the feedback terminal to a voltage for at least a time that the bias voltage is negative with respect to an input return of the power supply. 1. An integrated circuit for use in a power supply , the integrated circuit comprising:a feedback terminal to be coupled to receive a feedback signal that is representative of a bias voltage across a bias winding of the power supply;a controller to be coupled to control switching of a power switch included in the power supply in response to the feedback signal; anda clamp included in the controller and coupled to clamp the feedback terminal to a voltage for at least a time that the bias voltage is negative with respect to an input return of the power supply.2. The integrated circuit of claim 1 , wherein the clamp is configured to clamp the feedback terminal to the voltage for a time equal to an ON time of the power switch plus a delay time.3. The integrated circuit of claim 2 , wherein the delay time is fixed.4. The integrated circuit of claim 2 , wherein the delay time is variable and is responsive to a magnitude of a peak switch current through the power switch during an ON time of the power switch.5. The integrated circuit of claim 1 , wherein the power switch is a metal oxide semiconductor field effect transistor (MOSFET) having a source terminal claim 1 , and wherein the clamp is coupled to clamp the feedback terminal to a potential voltage that is at the source terminal.6. The integrated circuit of claim 1 , wherein the power switch is included in the integrated circuit.7. An integrated circuit for ...

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Номер записи: 61
29-08-2013 дата публикации

METHOD AND APPARATUS FOR A POWER SUPPLY CONTROLLER RESPONSIVE TO A FEEDFORWARD SIGNAL

Номер: US20130223105A1
Автор: Bäurle Stefan, Wang Zhao-Jun
Принадлежит: Power Integrations, Inc

An example power converter includes an energy transfer element, a switch, a feedback circuit, a feedforward circuit, and an integrated circuit controller. The integrated circuit controller includes a gain selector circuit and a switch duty cycle controller. The gain selector circuit selects a gain multiplier according to a value of a feedforward signal generated by the feedforward circuit and applies the gain multiplier to the feedforward signal to generate a duty cycle adjust signal. The switch duty cycle controller generates a drive signal to control the switch in response to a feedback signal generated by the feedback circuit. A duty cycle of the drive signal is varied in response to the duty cycle adjust signal such that the duty cycle varies according to a plurality of linear functions over a range of values of the feedforward signal. 1. A power converter , comprising:an energy transfer element to be coupled to receive a direct-current (DC) input voltage;a switch coupled to the energy transfer element to control a transfer of energy through the energy transfer element;a feedback circuit coupled to generate a feedback signal that is representative of an output of the power converter;a feedforward circuit coupled to generate a feedforward signal that is representative of the DC input voltage; and a gain selector circuit coupled to select a gain multiplier according to a value of the feedforward signal and to apply the gain multiplier to the feedforward signal to generate a duty cycle adjust signal; and', 'a switch duty cycle controller coupled to generate the drive signal in response to the feedback signal, wherein a duty cycle of the drive signal is varied in response to the duty cycle adjust signal such that the duty cycle varies according to a plurality of linear functions over a range of values of the feedforward signal., 'an integrated circuit controller coupled to generate a drive signal to control switching of the switch to regulate the output of the power ...

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Номер записи: 62
29-08-2013 дата публикации

Systems and methods for protecting power conversion systems based on at least feedback signals

Номер: US20130223107A1
Автор: Lieyi Fang, Xiuhong Zhang, YUAN LIN, Yunchao ZHANG
Принадлежит: On Bright Electronics Shanghai Co Ltd

System and method for protecting a power conversion system. An example system controller includes a protection component and a driving component. The protection component is configured to receive a demagnetization signal generated based on at least information associated with a feedback signal of the power conversion system, process information associated with the demagnetization signal and a detected voltage generated based on at least information associated with the feedback signal, and generate a protection signal based on at least information associated with the detected voltage and the demagnetization signal. The driving component is configured to receive the protection signal and output a driving signal to a switch configured to affect a primary current flowing through a primary winding of the power conversion system. The detected voltage is related to an output voltage of the power conversion system. The demagnetization signal is related to a demagnetization period of the power conversion system.

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Номер записи: 63
05-09-2013 дата публикации

FEEDBACK CIRCUIT AND CONTROL METHOD FOR AN ISOLATED POWER CONVERTER

Номер: US20130229833A1
Автор: FAN Cheng-Hsuan, LIN Tzu-Chen, TAI Liang-Pin
Принадлежит: RICHTEK TECHNOLOGY CORP.

A feedback circuit for an isolated power converter includes an opto-coupler and a reversed polarity regulator. The opto-coupler provides a current related to an output voltage of the isolated power converter. When the isolated power converter enters light load, the output voltage rises and the reversed polarity regulator reduces the current to decrease the power consumption and thus improve the light load efficiency of the isolated power converter. 1. A feedback circuit for an isolated power converter including a controller to switch a power switch to convert an input voltage to an output voltage , the feedback circuit comprising:an opto-coupler coupled to an output of the isolated power converter, operative to amplify a first current related to the output voltage to generate a second current;a current-to-voltage converter connected to the opto-coupler, operative to generate a first voltage according to the second current;a reversed polarity regulator connected to the opto-coupler, operative to decrease the first current in response to an increase in the output voltage at light load;a voltage source providing a second voltage; anda start up circuit coupled to the current-to-voltage converter and the voltage source, operative to select one of the first voltage and the second voltage as a feedback signal for the controller;wherein the start up circuit disconnects the first voltage from the controller when the start up circuit selects the second voltage as the feedback signal for the controller.2. The feedback circuit of claim 1 , wherein the current-to-voltage converter comprises a resistor to generate the first voltage according to the second current.3. The feedback circuit of claim 1 , wherein the reversed polarity regulator comprises:a BJT having a collector coupled to the output of the isolated power converter, an emitter coupled to an input of the opto-coupler, and a base coupled to the output of the isolated power converter; anda Zener diode connected between ...

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Номер записи: 64
12-09-2013 дата публикации

REGULATION FOR POWER SUPPLY MODE TRANSITION TO LOW-LOAD OPERATION

Номер: US20130235621A1
Автор: Kesterson John William, Wang Xiaoyan, Yan Liang
Принадлежит: IWATT INC.

A switching power converter includes a controller configured to transition from a first operating mode to a second operating mode by determining the operating conditions at the transition point between the operation modes. The controller uses a point where a switch included in the power converter would have been turned on if operating under the first operating mode as a reference point to determine when to turn on the switch under the second operating mode. Using the reference point, the switching power converter determines a control period for regulating the switching period of the switch in a second operating mode.

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Номер записи: 65
12-09-2013 дата публикации

POWER SOURCE DEVICE AND IMAGE FORMING APPARATUS

Номер: US20130236204A1
Автор: Yamaguchi Tsuyoshi
Принадлежит: CANON KABUSHIKI KAISHA

A power source device includes: a transformer; a switching section driving a primary side of the transformer; and a controller capable of performing a switching operation on driving of the switching section for controlling an output of a secondary side of the transformer. The device detects a drive frequency for the switching section in the switching operation, and switches the drive frequency so as not to be a frequency in a prescribed range when the detected drive frequency reaches a threshold. 1. A power source device comprising:a transformer;a switching section driving a primary side of the transformer;a controller capable of performing a switching operation including a time period for driving the switching section and a time period for suspending the switching section, to control an output from a secondary side of the transformer;a detector detecting a drive frequency for the switching section in the switching operation; anda frequency switch switching the drive frequency so as not to be a frequency in a prescribed range, when the drive frequency detected by the detector reaches a threshold.2. The power source device according to claim 1 , further comprisinga threshold switch switching the threshold according to the drive frequency detected by the detector.3. The power source device according to claim 2 ,wherein, when the frequency detected by the detector is lower than a prescribed frequency, the threshold switch adopts a first threshold as the threshold, and, when the frequency detected by the detector is higher than the prescribed frequency, the threshold switch adopts a second threshold different from the first threshold as the threshold.4. The power source device according to claim 1 , further comprisinga feedback section outputting information relating to an output on the secondary side of the transformer, to the controller via a resistor,wherein the frequency switch switches the drive frequency by switching a resistor value of the resistor.5. The power ...

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Номер записи: 66
12-09-2013 дата публикации

POWER SUPPLY DEVICE AND IMAGE FORMING APPARATUS

Номер: US20130236206A1
Автор: AOKI Masaru, Hayasaki Minoru, Shoji Ryuhei
Принадлежит: CANON KABUSHIKI KAISHA

The power supply device includes a transformer, a switching unit for driving a primary side of the transformer, a detection unit for detecting an output corresponding to a current flowing on the primary side, a transmission unit for transmitting an output voltage from a secondary side to the primary side, and a control unit for controlling an operation of the switching unit in accordance with an output from the transmission unit, in which, when a switching frequency for driving the switching unit falls within a predetermined frequency range including a resonant frequency of the transformer, the control unit controls the switching unit so as to shorten a turn-ON time of the switching unit in accordance with an output from the detection unit. 1. A power supply device , comprising:a transformer in which a primary side and a secondary side are insulated with each other;a switching unit for driving the primary side of the transformer;a detection unit for detecting a current flowing on the primary side to output an output value corresponding to the current and a resonant frequency of the transformer;a transmission unit for transmitting an output voltage from the secondary side to the primary side; anda control unit for controlling an operation of the switching unit in accordance with an output from the transmission unit,wherein when a switching frequency for driving the switching unit falls within a predetermined frequency range including the resonant frequency of the transformer, the control unit controls the switching unit to shorten a turn-on time of the switching unit, in accordance with the output value output by the detection unit.2. A power supply device according to claim 1 , wherein when the output from the detection unit has a positive value claim 1 , the control unit turns on the switching unit to shorten a time period until the output value output by the detection unit reaches a value higher than the output of the transmission unit.3. A power supply device ...

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Номер записи: 67
19-09-2013 дата публикации

PHASE-SHIFTING A SYNCHRONIZATION SIGNAL TO REDUCE ELECTROMAGNETIC INTERFERENCE

Номер: US20130242621A1
Автор: Hussain Asif, Sims Nicholas A.
Принадлежит: Apple Inc.

A power supply with reduced electromagnetic interference (EMI) is described. This power supply includes cascaded stages with switched-mode power-supply circuits that are switched synchronously during operation by switching signals that have a common fundamental frequency. EMI associated with the power supply is reduced by establishing a phase shift between the switching signals in at least two of the stages. 1. A power supply , comprising:a first switched-mode power-supply circuit configured to output a first power signal based on a first switching signal;a second switched-mode power-supply circuit, electrically coupled to the first switched-mode power-supply circuit, configured to output a second power signal based on a second switching signal, wherein the first switching signal and the second switching signal have a common fundamental frequency; anda storage mechanism configured to store information specifying a phase value, wherein the power supply is configured to establish a phase shift, corresponding to the phase value, between the first switching signal and the second switching signal based on the stored information.2. The power supply of claim 1 , wherein the second switched-mode power-supply circuit is configured to establish the phase shift of the second switching signal relative to the first switching signal.3. The power supply of claim 1 , wherein the first switched-mode power-supply circuit is configured to establish the phase shift of the first switching signal relative to the second switching signal.4. The power supply of claim 1 , wherein the storage mechanism includes a programmable register.5. The power supply of claim 4 , further comprising a feedback mechanism claim 4 , coupled to the programmable register claim 4 , configured to monitor electromagnetic interference (EMI) associated with the power supply and to adjust the stored information based on an EMI criterion.6. The power supply of claim 1 , further comprising a third switched-mode power- ...

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Номер записи: 68
19-09-2013 дата публикации

METHOD AND APPARATUS FOR STARTING UP

Номер: US20130242622A1
Автор: Choi Jinho, Peng Hao, Shu Biing Long
Принадлежит: MARVELL WORLD TRADE LTD.

Aspects of the disclosure provide a method. The method includes receiving an input voltage rectified from an alternating current (AC) power supply, detecting a time duration that the input voltage is between a first threshold voltage and a second threshold voltage, determining a line voltage of the AC power supply based on the time duration, and regulating a time for turning on a switch to transfer energy via a transformer based on the detected line voltage. 1. A method , comprising:receiving an input voltage rectified from an alternating current (AC) power supply;detecting a time duration that the input voltage is between a first threshold voltage and a second threshold voltage;determining a line voltage of the AC power supply based on the time duration; andregulating a time for turning on a switch to transfer energy via a transformer based on the detected line voltage.2. The method of claim 1 , further comprising:regulating the time for turning on the switch to transfer energy via the transformer at a power up based on an assumption that the AC power supply is a high line AC power supply with a dimmer.3. The method of claim 2 , wherein regulating the time for turning on the switch to transfer energy via the transformer at the power up comprises:regulating the time for turning on the switch to limit a substantially constant peak current flowing through the switch.4. The method of claim 3 , wherein regulating the time for turning on the switch to limit the substantially constant peak current flowing through the switch further comprises:generating pulses with a pulse width modulated based on a sensed current.5. The method of claim 1 , wherein determining the line voltage of the AC power supply based on the time duration comprises:determining the line voltage to be a high line voltage when a ratio of the detected time duration to an AC cycle is lower than a first value; anddetermining the line voltage to be a low line voltage when the ratio is high than a second value ...

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Номер записи: 69
26-09-2013 дата публикации

SWITCHING POWER-SUPPLY CIRCUIT

Номер: US20130250622A1
Автор: HOSOTANI Tatsuya, YAMAGUCHI Satoshi
Принадлежит: MURATA MANUFACTURING CO., LTD.

A switching power-supply circuit includes a second rectifying/smoothing circuit arranged to generate a second output voltage by rectifying and smoothing the output of a second secondary winding, and the second rectifying/smoothing circuit includes a second rectifier circuit and a capacitor, connected to the second secondary winding. A second switching control circuit operates in response to an alternating-current winding voltage occurring in the second secondary winding, and includes a time constant circuit causing a switch mechanism connected to the control terminal of a rectifier switch element to operate, and a second feedback circuit arranged to detect and feed back the second output voltage to the time constant circuit. 1. A switching power-supply circuit comprising:a transformer including a primary winding, a first secondary winding, and a second secondary winding;a main switching element connected in series to the primary winding;a first rectifying/smoothing circuit arranged to generate a first output voltage by rectifying and smoothing an output of the first secondary winding;a second rectifying/smoothing circuit arranged to generate a second output voltage by rectifying and smoothing an output of the second secondary winding;a first feedback circuit arranged to generate a feedback signal according to the first output voltage; anda first switching control circuit arranged to control the main switching element based on the feedback signal and stabilize the first output voltage; whereinthe second rectifying/smoothing circuit includes a second rectifier circuit;the second rectifier circuit includes a rectifier switch element and a second switching control circuit arranged to control the rectifier switch element; andthe second switching control circuit operates in response to an alternating-current winding voltage occurring in the second secondary winding provided in the transformer or a drive winding provided in the transformer, and includes a time constant ...

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Номер записи: 70
26-09-2013 дата публикации

Resonant Conversion Circuit

Номер: US20130250623A1
Автор: PAN Denghai, Xu Jinzhu
Принадлежит: Huawei Technologies Co., Ltd.

A resonant conversion circuit includes resonant conversion circuit units having at least two phases interleaved in parallel, where magnetic devices in the resonant conversion circuit units are magnetically integrated in an inter-phase manner on a same magnetic core. Because a magnetic coupling action exists between the magnetic devices integrated on the same magnetic core, automatic current sharing effect is produced on currents in circuit branches of different phases. In this way, current sharing of the resonant conversion circuit units of various phases is achieved, and the volume of a power supply is reduced because of integration of the magnetic devices. 1. A resonant conversion circuit comprising:resonant conversion circuit units having at least two phases interleaved in parallel,wherein magnetic devices in the resonant conversion circuit units are magnetically integrated in an inter-phase manner on a same magnetic core.2. The resonant conversion circuit according to claim 1 , wherein the magnetic devices in the resonant conversion circuit units are magnetically integrated in the inter-phase manner on the same magnetic core comprises resonant inductors in the resonant conversion circuit units being magnetically integrated in the inter-phase manner on the same magnetic core.3. The resonant conversion circuit according to claim 2 , wherein the resonant inductors in the resonant conversion circuit units are magnetically integrated in the inter-phase manner on the same magnetic core comprises resonant inductors of different phases being separately disposed on different E-type magnetic cores claim 2 , wherein the different E-type magnetic cores are integrated on a same I-type magnetic core.4. The resonant conversion circuit according to claim 3 , wherein a coupling coefficient between resonant inductors of two phases is adjusted by adjusting an air gap between at least one of the E-type magnetic cores and the I-type magnetic core.5. The resonant conversion circuit ...

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Номер записи: 71
26-09-2013 дата публикации

SWITCHING POWER SUPPLY APPARATUS

Номер: US20130250625A1
Автор: YAMAGUCHI Naoki
Принадлежит: MURATA MANUFACTURING CO., LTD.

In a switching power supply apparatus, a low-side switching device is connected in series with a primary winding. A high-side switching device and the primary winding define a closed loop. A voltage induced in a high-side drive winding is applied to the high-side switching device to turn on the high-side switching device. A transistor, which is turned on/off in accordance with the voltage across a capacitor charged by the voltage induced in the high-side drive winding, is connected to the gate terminal of the high-side switching device. When the capacitor is charged and the transistor is turned on, the high-side switching device is turned off. The capacitor is discharged by the voltage induced in the high-side drive winding, during the ON period of the low-side switching device. 1. A switching power supply apparatus comprising:a power supply input portion to which an input voltage is input;a transformer including a primary winding, a secondary winding, and a drive winding magnetically coupled to one another;a low-side switching device connected in series with the primary winding and that is turned on and off such that the input voltage is intermittently applied to the primary winding;a resonant capacitor, a resonant inductor, and a high-side switching device connected across the primary winding so as to define a closed loop;a first control circuit arranged to control the low-side switching device; anda second control circuit arranged to control the high-side switching device in accordance with a voltage generated in the drive winding; wherein a first capacitor connected between the drive winding and a control terminal of the high-side switching device and charged during an ON period of the low-side switching device;', 'a second capacitor connected to a connection node between the first capacitor and the drive winding;', 'a charging circuit connected between the second capacitor and a connection node between the high-side switching device and the first capacitor and ...

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Номер записи: 72
26-09-2013 дата публикации

SWITCHING POWER-SUPPLY CIRCUIT

Номер: US20130250626A1
Автор: HOSOTANI Tatsuya
Принадлежит: MURATA MANUFACTURING CO., LTD.

A switching power-supply circuit includes a transformer, a first switching element, a first rectifying/smoothing circuit generating a first output voltage by rectifying and smoothing the output of a first secondary winding, a second rectifying/smoothing circuit generating a second output voltage by rectifying and smoothing the output of a second secondary winding, a first feedback circuit generating a feedback signal according to the first output voltage, and a first switching control circuit. When the voltage of the second secondary winding is greater than the second output voltage and the second output voltage is less than the voltage of a reference-voltage circuit, a second rectifier circuit turns on a rectifier switch element, and stabilizes the second output voltage by controlling the number of pulses per unit time in a pulse current flowing through the second rectifier circuit. 1. A switching power-supply circuit comprising:a transformer including a primary winding, a first secondary winding, and a second secondary winding;a first switching element connected in series to the primary winding;a first rectifying/smoothing circuit arranged to generate a first output voltage by rectifying and smoothing an output of the first secondary winding;a second rectifying/smoothing circuit arranged to generate a second output voltage by rectifying and smoothing an output of the second secondary winding;a first feedback circuit arranged to generate a feedback signal according to the first output voltage; anda switching control circuit arranged to control the first switching element based on the feedback signal and to stabilize the first output voltage; whereina rectifier circuit in the second rectifying/smoothing circuit includes a rectifier switch element and a drive control circuit arranged to cause the rectifier switch element to be conductively connected when an input voltage is greater than the second output voltage and the second output voltage is less than a ...

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Номер записи: 73
26-09-2013 дата публикации

CONSTANT VOLTAGE CONSTANT CURRENT CONTROL CIRCUITS AND METHODS WITH IMPROVED LOAD REGULATION

Номер: US20130250629A1
Автор: Xu Xiaoru
Принадлежит: SILERGY SEMICONDUCTOR TECHNOLOGY (HANGZHOU) LTD

The present invention discloses CVCC circuits and methods with improved load regulation for an SMPS. In one embodiment, the CVCC can include: a voltage feedback circuit to generate an output voltage feedback signal; a current feedback circuit to generate an output current feedback signal; a control signal generating circuit that receives the output voltage feedback signal and the output current feedback signal, and generates a constant voltage/constant current control signal; a first enable signal generating circuit that compares a first reference voltage and the constant voltage/constant current control signal to generate a first enable signal; and a PWM controller that generates a PWM control signal based on the constant voltage/constant current control signal to control a main switch of the flyback SMPS. 1. A constant voltage constant current (CVCC) control circuit for load regulation for a flyback switch mode power supply (SMPS) , the CVCC comprising:a) a voltage feedback circuit configured to generate an output voltage feedback signal;b) a current feedback circuit configured to generate an output current feedback signal;c) a control signal generating circuit configured to receive said output voltage feedback signal and said output current feedback signal, and to generate a constant voltage/constant current control signal;d) a first enable signal generating circuit configured to compare a first reference voltage and said constant voltage/constant current control signal to generate a first enable signal; ande) a pulse-width modulation (PWM) controller configured to generate a PWM control signal based on said constant voltage/constant current control signal to control a main switch of said flyback SMPS, wherein said PWM control signal is configured to turn on said main switch when said first enable signal is inactive, and wherein said main switch remains off when said first enable signal is active.2. The CVCC control circuit of claim 1 , wherein claim 1 , said ...

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Номер записи: 74
03-10-2013 дата публикации

POWER SUPPLY DEVICE AND ELECTRONIC DEVICE SYSTEM

Номер: US20130257162A1
Автор: YAMADA Tomokazu
Принадлежит:

A power supply device connected to an electronic device for supplying power to the electronic device, including a plurality of control units configured to control supply of power to the electronic device and a switching circuit configured to receive, from the electronic device, a status signal indicating power status of the electronic device or operating status of the electronic device, and to control supply of a power supply voltage to the plurality of control units based on the status signal. 1. A power supply device connected to an electronic device for supplying power to the electronic device , comprising:a plurality of control units configured to control supply of power to the electronic device; anda switching circuit configured to receive, from the electronic device, a status signal indicating power status of the electronic device or operating status of the electronic device, and to control supply of a power supply voltage to the plurality of control units based on the status signal.2. The power supply device according to claim 1 , wherein the switching circuit sets an input voltage to the plurality of control units used to control supply of power to the electronic device to low level based on the status signal.3. The power supply device according to claim 1 , wherein the switching circuit sets supply of the power supply voltage to the plurality of control units to low level when the status signal is a high-level signal.4. The power supply device according to claim 1 , wherein the switching circuit starts supply of the power supply voltage to the plurality of control units when the status signal is a low-level or open signal.5. The power supply device according to claim 2 , wherein the switching circuit simultaneously stops the input voltage and the power supply voltage to the plurality of control units.6. The power supply device according to claim 1 , wherein the switching circuit is a photocoupler or a photo-MOS.7. The power supply device according to claim ...

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Номер записи: 75
03-10-2013 дата публикации

COMPOUND SEMICONDUCTOR DEVICE AND MANUFACTURING METHOD OF THE SAME

Номер: US20130258719A1
Автор: Kikkawa Toshihide
Принадлежит: FUJITSU LIMITED

An AlGaN/GaN.HEMT includes, a compound semiconductor lamination structure; a p-type semiconductor layer formed on the compound semiconductor lamination structure; and a gate electrode formed on the p-type semiconductor layer, in which Mg being an inert element of p-GaN is introduced into both sides of the gate electrode at the p-type semiconductor layer, and introduced portions of Mg are inactivated. 1. A compound semiconductor device , comprising:a compound semiconductor lamination structure;a p-type semiconductor layer formed at upward of the compound semiconductor lamination structure; andan electrode formed at upward of the p-type semiconductor layer,wherein an inert element is introduced into both sides of the electrode, and introduced portions of the inert element are inactivated at the p-type semiconductor layer.2. The compound semiconductor device according to claim 1 ,wherein the inert element is introduced into a surface layer portion, and a non-introduced portion of the inert element remains at downward of the surface layer portion at the p-type semiconductor layer.3. The compound semiconductor device according to claim 1 , further comprising:a protective insulating film that covers the introduced portion of the inert element of the p-type semiconductor layer.4. The compound semiconductor device according to claim 1 ,{'sub': '2', 'wherein the inert element is argon (Ar), iron (Fe), phosphorus (P), oxygen (O) or boron (B) or any combination thereof.'}5. A manufacturing method of a compound semiconductor device claim 1 , comprising:forming a compound semiconductor lamination structure;forming a p-type semiconductor layer at an electrode formation region at upward of the compound semiconductor lamination structure; andinactivating an introduced portion of an inert element of the p-type semiconductor layer by introducing the inert element at both sides of the electrode formation region of the p-type semiconductor layer.6. The manufacturing method of the ...

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Номер записи: 76
03-10-2013 дата публикации

RESONANT POWER SUPPLY WITH AN INTEGRATED INDUCTOR

Номер: US20130258720A1
Автор: Ligenza Slawomir, Worek Cezary
Принадлежит: AKADEMIA GORNICZO-HUTNICZA IM STANISLAWA STASZICA W KRAKOWIE

A resonant-mode power supply comprising an integrated inductor (ZER), the integrated inductor (ZER) comprising an inductor (IR) and a transformer (TR). The main internal winding () of the transformer (TR) is surrounded by magnetic elements () for closing the magnetic flux lines around the main internal winding () of the transformer (TR), wherein at least one magnetic element () is surrounded by at least one auxiliary external winding () of the inductor (IR) arranged orthogonally to the main internal winding () of the transformer (TR), and the power supply being configured such that during operation the current (I) flowing through the inductor (IR) is shifted in phase with respect to the current (I) flowing through the primary winding of the transformer (TR). 112312341. A resonant-mode power supply comprising an integrated inductor (ZER) , the integrated inductor (ZER) comprising an inductor (IR) and a transformer (TR) , characterized in that the main internal winding () of the transformer (TR) is surrounded by magnetic elements ( , ) for closing the magnetic flux lines around the main internal winding () of the transformer (TR) , wherein at least one magnetic element ( , ) is surrounded by at least one auxiliary external winding () of the inductor (IR) arranged orthogonally to the main internal winding () of the transformer (TR) , and the power supply being configured such that during operation the current (I) flowing through the inductor (IR) is shifted in phase with respect to the current (I) flowing through the primary winding of the transformer (TR).223. The resonant-mode power supply according to claim 1 , characterized in that the magnetic elements ( claim 1 , ) of the integrated inductor (ZER) are separated by non-magnetic gaps in at least one of a vertical and a horizontal plane.3. The resonant-mode power supply according to claim 1 , characterized in that the shift in phase between the currents (I claim 1 , I) is close to 90°.412312341. A method for ...

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Номер записи: 77
03-10-2013 дата публикации

PHASE-CUT PRE-REGULATOR AND POWER SUPPLY COMPRISING THE SAME

Номер: US20130258722A1
Автор: MOON Sang Cheol, PARK Young-Bae, Wang Charlie
Принадлежит:

A power supply includes a phase-cut pre-regulator. The phase-cut pre-regulator comprises a switching device connected between a line voltage and an input voltage of a bulk capacitor and a comparator receiving the line voltage and a reference voltage, comparing the line voltage with hysteresis reference voltages based on the reference voltage, and switching the switching device according to the compared result. 1. A phase-cut pre-regulator comprising:a switching device connected between a line voltage and an input voltage of a bulk capacitor; anda comparator receiving the line voltage and a reference voltage, comparing the line voltage with a plurality of hysteresis reference voltages that are based on the reference voltage, and switching the switching device according to a result of comparing the line voltage with the plurality of hysteresis reference voltages.2. The phase-cut pre-regulator of claim 1 , wherein the comparator is configured to output a switching signal to turn-off the switching device when the line voltage is higher than a first hysteresis reference voltage in the plurality of hysteresis reference voltages.3. The phase-cut pre-regulator of claim 2 , wherein the comparator is configured to output the switching signal to turn-on the switching device when the line voltage is lower than a second hysteresis reference voltage in the plurality of hysteresis reference voltages.4. The phase-cut pre-regulator of claim 3 , wherein the first hysteresis reference voltage is higher than the second hysteresis reference voltage.5. The phase-cut pre-regulator of claim 1 , wherein the bulk capacitor is charged by the line voltage in a turn-on time of the switching device when the switching device is turned on and energy stored in the bulk capacitor is discharged in a turn-off time of the switching device when the switching device is turned off.6. A power supply comprising:a rectifier circuit rectifying an AC input to generate a line voltage;a bulk capacitor;a ...

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Номер записи: 78
03-10-2013 дата публикации

SYSTEMS AND METHODS FOR CONSTANT VOLTAGE CONTROL AND CONSTANT CURRENT CONTROL

Номер: US20130258723A1
Автор: Fang Lieyi, Sun Zhiqiang
Принадлежит: ON-BRIGHT ELECTRONICS (SHANGHAI) CO., LTD.

System and method for regulating a power conversion system. A system controller for regulating a power conversion system includes a first controller terminal, a second controller terminal and a third controller terminal. The system controller is configured to receive an input signal at the first controller terminal and turn on or off a switch based on at least information associated with the input signal to adjust a primary current flowing through a primary winding of the power conversion system, receive a first signal at the second controller terminal from the switch, and charge a capacitor through the third controller terminal in response to the first signal. 1. A system controller for regulating a power conversion system , the system controller comprising:a first controller terminal;a second controller terminal; anda third controller terminal; receive an input signal at the first controller terminal and turn on or off a switch based on at least information associated with the input signal to adjust a primary current flowing through a primary winding of the power conversion system;', 'receive a first signal at the second controller terminal from the switch; and', 'charge a capacitor through the third controller terminal in response to the first signal., 'wherein the system controller is configured to2. The system controller of wherein the first controller terminal is connected claim 1 , directly or indirectly to a resistor claim 1 , the resistor being configured to receive a third signal associated with an AC signal received by the power conversion system and output the input signal to the first controller terminal based on at least information associated with the third signal.3. The system controller of wherein the second controller terminal is connected claim 1 , directly or indirectly to a diode claim 1 , the diode including an anode terminal and a cathode terminal; the anode terminal is connected, directly or indirectly, to the second controller terminal; and ...

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Номер записи: 79
10-10-2013 дата публикации

VIBRATOR ELEMENT, MANUFACTURING METHOD OF VIBRATOR ELEMENT, SENSOR UNIT, AND ELECTRONIC APPARATUS

Номер: US20130264908A1
Автор: MATSUO Atsushi
Принадлежит: SEIKO EPSON CORPORATION

A vibration gyro-element includes a base portion, an excitation vibrating arm and a detection vibrating arm extending from the base portion, and a first adjustment vibrating arm and a second adjustment vibrating arm extending from the base portion and vibrating along with excitation vibration of the excitation vibrating arm, wherein an output signal of the first adjustment vibrating arm at least is out of phase with respect to an output signal of leakage vibration of the detection vibrating arm, and wherein an amplitude of the output signal of the first adjustment vibrating arm is larger than an amplitude of the output signal of the second adjustment vibrating arm. 1. A vibrator element comprising:a base portion;an excitation vibrating arm and a detection vibrating arm extending from the base portion; anda first adjustment vibrating arm and a second adjustment vibrating arm extending from the base portion and vibrating along with excitation vibration of the excitation vibrating arm,wherein an output signal of the first adjustment vibrating arm at least is out of phase with respect to an output signal of leakage vibration of the detection vibrating arm, andwherein an amplitude of the output signal of the first adjustment vibrating arm is larger than an amplitude of the output signal of the second adjustment vibrating arm.2. The vibrator element according to claim 1 , wherein claim 1 , when a vibration frequency of the first adjustment vibrating arm is indicated by f claim 1 , a vibration frequency of the second adjustment vibrating arm is indicated by f claim 1 , a vibration frequency of the excitation vibrating arm is indicated by fk claim 1 , and Δf1=|fk−f| and Δf2=|fk−f| claim 1 , Δf1<Δf2 is satisfied.3. The vibrator element according to claim 1 , wherein the detection vibrating arm is provided with a detection electrode which electrically detects vibration generated according to a physical quantity applied when the excitation vibrating arm is excited claim 1 , ...

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Номер записи: 80
17-10-2013 дата публикации

SWITCHING POWER SUPPLY APPARATUS

Номер: US20130272031A1
Автор: HOSOTANI Tatsuya
Принадлежит: MURATA MANUFACTURING CO., LTD.

A transformer that realizes ZVS operation includes a primary winding and a secondary winding. A control circuit turns switching elements on and off in a complimentary manner in order to repeatedly invert the voltage applied to the primary winding. A conduction path supplies a voltage excited in the secondary winding to a load connected between a high-potential side and a ground side of the secondary winding. A first rectifier diode has a rectification direction extending from the high-potential side toward the ground side of the load and is provided along the conduction path. A second rectifier diode and a capacitor, which are connected in series with each other, are connected in parallel with the secondary winding. An inductor is connected in parallel with the second rectifier diode. A rectification direction of the second rectifier diode matches the direction extending from the high-potential side to the ground side. 1. A switching power supply apparatus comprising:a transformer including a primary winding and a secondary winding;a switching unit that repeatedly inverts a voltage applied to the primary winding;a conduction path that supplies a voltage excited in the secondary winding due to operation of the switching unit to a load that is connected between a high-potential side and a ground side of the secondary winding; anda first rectifier element that has a rectification direction extending from a high-potential side toward a ground side of the load and that is provided along the conduction path; whereina second rectifier element and a first capacitor, which are connected in series with each other, are connected in parallel with the secondary winding;the second rectifier element has a rectification direction extending from the high-potential side toward the ground side; anda resistance and/or an inductive impedance is connected in parallel with the second rectifier element.2. The switching power supply apparatus according to claim 1 , wherein the switching ...

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Номер записи: 81
17-10-2013 дата публикации

DC/DC VOLTAGE CONVERTER AND METHOD FOR OPERATING A DC/DC VOLTAGE CONVERTER

Номер: US20130272032A1
Автор: Heinze Sebastian, Leifert Torsten, Mueller Jens-Uwe, Willenberg Mario
Принадлежит:

The disclosure relates to a method for operating a DC/DC voltage converter comprising a first switching bridge with at least two first switches coupled to an input of the DC/DC voltage converter, a second switching bridge with at least two second switches coupled to an output of the DC/DC voltage converter, a transformer and at least one capacitor, wherein the first switching bridge is connected to the second switching bridge via the transformer. The first switches are switched such that a resonant circuit formed by the transformer and the at least one capacitor is operated in resonance, and the second switches are switched at the same clock frequency with a phase shift compared to the first switches, such that the second switches are switched prior to the first switches. The disclosure also relates to a DC/DC voltage converter comprising a control circuit for the first and second switches which is configured to carry out the method, and to a backup power system including such a DC/DC voltage converter. 1. A DC/DC voltage converter , comprising:a first switching bridge comprising at least two first switches coupled to an input of the DC/DC voltage converter;a second switching bridge comprising at least two second switches coupled to an output of the DC/DC voltage converter;a transformer coupled between the first switching bridge and the second switching bridge;at least one capacitor; anda switching control circuit configured to provide control signals to the first switching bridge and the second switching bridge,wherein the first switches are switched by the switching control circuit such that a resonant circuit formed by the transformer and the at least one capacitor is operated in resonance, andwherein the second switches are switched by the switching control circuit at the same clock frequency with a phase shift compared to the first switches, such that the second switches are switched prior to the first switches.2. The DC/DC voltage converter as claimed in claim ...

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Номер записи: 82
17-10-2013 дата публикации

Switching converter systems with isolating digital feedback loops

Номер: US20130272035A1
Автор: Bernhard Strzalkowski
Принадлежит: Analog Devices Inc

A switching converter system includes a feedback path with at least one comparator arranged to provide a digital error signal in response to a comparison of an output voltage to a reference voltage. A first isolation channel can be configured to isolatably transport a clock signal to digitally gate the error signal, and a second isolation channel can be configured to isolatably transport the error signal. A controller can be coupled to the first and second isolation channels and configured to control a duty cycle in response to the error signal. A transformer is preferably inserted into the first and second isolation channels to enhance isolation and the first and second isolation channels respectively can include first and second digital gates that each have an output port coupled to an input port of the other.

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Номер записи: 83
17-10-2013 дата публикации

SYSTEMS AND METHODS FOR REGULATING POWER CONVERSION SYSTEMS WITH OUTPUT DETECTION AND SYNCHRONIZED RECTIFYING MECHANISMS

Номер: US20130272036A1
Автор: Fang Lieyi
Принадлежит: ON-BRIGHT ELECTRONICS (SHANGHAI) CO., LTD.

System and method for regulating a power conversion system. A system controller for regulating a power conversion system includes a first controller terminal and a second controller terminal. The system controller is configured to receive at least an input signal at the first controller terminal, and generate a gate drive signal at the second controller terminal based on at least information associated with the input signal to turn on or off a transistor in order to affect a current associated with a secondary winding of the power conversion system. The system controller is further configured to, if the input signal is larger than a first threshold, generate the gate drive signal at a first logic level to turn off the transistor. 1. A system controller for regulating a power conversion system , the system controller comprising:a first controller terminal; anda second controller terminal; receive at least an input signal at the first controller terminal; and', 'generate a gate drive signal at the second controller terminal based on at least information associated with the input signal to turn on or off a transistor in order to affect a current associated with a secondary winding of the power conversion system;, 'wherein the system controller is configured to if the input signal is larger than a first threshold, generate the gate drive signal at a first logic level to turn off the transistor; and', 'if the input signal changes from a first value larger than a second threshold to a second value smaller than the second threshold, change the gate drive signal from the first logic level to a second logic level to turn on the transistor., 'wherein the system controller is further configured to2. The system controller of is further configured to claim 1 , if the input signal changes from a first value larger than a second threshold to a second value smaller than the second threshold claim 1 , change the gate drive signal after a delay from the first logic level to the ...

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Номер записи: 84
17-10-2013 дата публикации

POWER SUPPLY CIRCUIT FOR REMOTELY TURNING-ON ELECTRICAL APPLIANCES

Номер: US20130272037A1
Автор: Aiello Natale, FINOCCHIARO Alessandro, LA ROSA Roberto, PALMISANO Giuseppe
Принадлежит:

A power supply circuit for an electrical appliance, including a turning-on stage configured for determining a transition from a turned-off state, in which the power supply circuit is off and does not supply electric power, to a turned-on state of the power supply circuit. The turning-on stage includes a transducer of the remote-control type configured for triggering the transition in response to the reception of a wireless signal. In some embodiments, operating power is transmitted from a remote controller to a control circuit of the electronic equipment, such that the electronic equipment can be turned on remotely but draws zero standby power. 1. A control circuit configured to control electronic equipment in response to a remote controller , comprising:a converter circuit configured to convert electromagnetic energy received from the remote controller to stored energy;a power management circuit configured to provide a regulated supply voltage based on the stored energy;a control logic circuit energized by the regulated supply voltage and configured to to detect a match between an ID code received from the remote controller and a local ID code representative of the electronic equipment, and to provide an enable signal in response to detecting the match; andan actuator circuit configured to activate the electronic equipment in response to the enable signal.2. A control circuit as defined in claim 1 , wherein the converter circuit is configured to convert radio frequency energy to the stored energy.3. A control circuit as defined in claim 1 , wherein the converter circuit is configured to convert infrared energy to the stored energy.4. A control circuit as defined in claim 1 , further comprising a receiver configured to receive the ID code from the remote controller.5. A control circuit as defined in claim 1 , wherein the actuator circuit is configured to activate a main power converter of the electronic equipment.6. A control circuit as defined in claim 4 , wherein ...

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Номер записи: 85
24-10-2013 дата публикации

SLAT-CONSTRUCTED AUTONOMIC TRANSFORMERS

Номер: US20130278115A1
Автор: Bird Ross W., Bradley William M., Knowles Gareth J.
Принадлежит:

Multilayered piezoelectric transformers, transformer elements and methods of constructing piezoelectric transformers are disclosed. 1. A modular slat comprising:a dielectric member of substantially uniform planar thickness, said dielectric member having first and second opposing faces and a sidewall; an outer electrode disposed along an outer boundary of the first face and having a discontinuous region, the outer electrode including first and second cutouts, the outer electrode further including an outer electrode tab extending along the sidewall from the first face towards the second face;', 'an inner electrode disposed substantially concentric with the outer electrode, the inner electrode including a central region and a leg extending from the central region to an edge of the first face and an inner electrode tab extending along the sidewall from the leg towards the second face;', 'an insulation region disposed between the first and second electrodes;, 'a first electrode assembly disposed on the first face, said first electrode assembly including an outer electrode disposed along an outer boundary of the second face and having a discontinuous region, the outer electrode including first and second cutouts that are aligned with the inner and outer electrode tabs of said first electrode assembly, the outer electrode further including a tab extending along the sidewall from the second face towards the first face and aligned with one of the first and second cutouts;', 'an inner electrode disposed substantially concentric with the outer electrode, the inner electrode including a central region and a leg extending from the central region to an edge of the second face and a tab extending along the sidewall from the leg towards the first face and aligned with the other of the first and second cutouts; and', 'an insulation region disposed between the first and second electrodes of the second electrode assembly., 'a second electrode assembly disposed on the second face where ...

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Номер записи: 86
24-10-2013 дата публикации

POWER SUPPLY SYSTEM, POWER CONVERTER AND VOLTAGE REGULATING METHOD

Номер: US20130279204A1
Автор: Huang Guisong, Xu Guojun, Yang Zhongwang
Принадлежит:

A power converter includes a power module, a feedback module, and a control module. The power module is used for converting an input voltage into an output voltage. The feedback module is electrically connected with the power module for generating a feedback voltage according to the output voltage. The control module is electrically connected with the feedback module and the power module for comparing a reference duty cycle value with a duty cycle, generating a variable reference voltage according to the comparison between the reference duty cycle value and the duty cycle, comparing the variable reference voltage with the feedback voltage, and adjusting the duty cycle according to the comparison between the variable reference voltage and the feedback voltage. 1. A power converter , comprising:a power module for converting an input voltage into an output voltage;a feedback module electrically connected with said power module for generating a feedback voltage according to said output voltage; anda control module electrically connected with said feedback module and said power module for comparing a reference duty cycle value with a duty cycle, generating a variable reference voltage according to the comparison between said reference duty cycle value and said duty cycle, comparing said variable reference voltage with said feedback voltage, and adjusting said duty cycle according to the comparison between said variable reference voltage and said feedback voltage.2. The power converter according to claim 1 , wherein as said input voltage is changed claim 1 , said variable reference voltage is adjusted by said control module claim 1 , said duty cycle is correspondingly adjusted by said control module claim 1 , and a driving control signal corresponding to said adjusted duty cycle is generated by said control module so as to control said power module.3. The power converter according to claim 1 , wherein said control module further comprises:a first comparing circuit for ...

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Номер записи: 87
24-10-2013 дата публикации

HOLD-UP TIME ENHANCEMENT CIRCUIT FOR LLC RESONANT CONVERTER

Номер: US20130279205A1
Автор: Keung Lee Tai
Принадлежит:

An open loop half-bridge LLC power converter includes circuitry to reliably increase hold-up time without sacrificing efficiency. An LLC resonant circuit includes resonant inductance, a primary transformer winding, and resonant capacitance. An auxiliary circuit includes an auxiliary transformer winding, an inductor, and a third switching element coupled in series. A controller is coupled across a voltage sensor and effective thereby to determine a holdup time condition. In a “normal” operating condition the controller generates switch driver signals to turn OFF the third switching element and disable the auxiliary circuit, and in a hold-up time condition the controller turns ON the third switching element and enables the auxiliary circuit wherein the output voltage is increased via current supplied from the auxiliary winding. In various embodiments the auxiliary winding may be an auxiliary primary or secondary, or a secondary to an auxiliary primary winding of a second transformer. 1. A power conversion system comprising:first and second switching elements coupled in series across first and second power input terminals;an LLC resonant circuit coupled between the first and second switching elements and comprising a first inductor, a primary winding of a transformer, and one or more resonant capacitors;an output circuit comprising one or more secondary transformer windings and a bulk capacitor coupled across first and second output terminals;a voltage sensor;a hold-up time enhancement circuit further comprising an auxiliary primary winding of the transformer, a second inductor coupled on a first end to the auxiliary transformer winding, and a third switching element coupled to a second end of the second inductor;a controller coupled to the voltage sensor and effective to determine a holdup time condition based on a voltage across the voltage sensor;the controller is further effective in a first operating mode associated with a normal condition to generate switch ...

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Номер записи: 88
24-10-2013 дата публикации

CONTROL CIRCUIT FOR AN INVERTER WITH SMALL INPUT CAPACITOR

Номер: US20130279206A1
Автор: YANG Ta-Yung
Принадлежит: SYSTEM GENERAL CORP.

A control circuit for an inverter according to the present invention comprises a PWM circuit and a controller. The PWM circuit generates switching signals in accordance with a PWM control signal. The switching signals are coupled to switch a transformer through transistors for generating an output of the inverter. The controller is coupled to receive a command signal and an input signal for generating the PWM control signal. The input signal is correlated to an input voltage waveform of the inverter. The command signal is utilized to determine a power level of the output of the inverter. The advantages of the control circuit are lower cost, small size, good power factor and higher reliability. 1. A control circuit of an inverter , comprising:a PWM circuit generating switching signals coupled to switch a transformer through transistors for generating an output of the inverter in accordance with a PWM control signal; anda controller coupled to receive a command signal and an input signal for generating the PWM control signal;wherein the input signal is correlated to an input voltage waveform of the inverter; the command signal is utilized to determine a power level of the output of the inverter.2. The circuit as claimed in claim 1 , wherein the controller further comprises:a memory storing at least one instruction code for executing the instruction code to generate the PWM control signal.3. The circuit as claimed in claim 1 , further comprising a current-sense device coupled to sense a switching current of the transformer and generate a current-sense signal coupled to limit the value of the switching current of the transformer.4. The circuit as claimed in claim 1 , further comprising a comparator coupled to receive a current-sense signal for generating an interrupt signal when the current-sense signal being over a threshold; wherein the interrupt signal is coupled to interrupt the controller and directly turn off the switching signals claim 1 , the current-sense ...

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Номер записи: 89
24-10-2013 дата публикации

DYNAMIC DRIVE OF SWITCHING TRANSISTOR OF SWITCHING POWER CONVERTER

Номер: US20130279209A1
Автор: Bui Hien Huu, Kesterson John William, Lee Andrew Kwok-Cheung, Li Yong, Lin Allan Ming-Lun, Seim Carrie, Zheng Jun, Zheng Junjie
Принадлежит:

The drive current of the switch in a switching power converter is adjusted dynamically according to line or load conditions within a switching cycle and/or over a plurality of switching cycles. The magnitude of the switch drive current can be dynamically adjusted within a switching cycle and/or over a plurality of switching cycles, in addition to the pulse widths or pulse frequencies of the switch drive current. 1. A switching power converter comprising:a magnetic component coupled between a power source and a load;a switch coupled to the magnetic component for coupling or decoupling the load to or from the power source through the magnetic component; anda switch controller coupled to the switch and generating a switch drive signal for turning on or off the switch during a plurality of switching cycles, the switch controller adjusting a current magnitude or a voltage magnitude of the switch drive signal within a part of a switching cycle of the plurality of switching cycles during which the switch is turned on.2. The switching power converter of claim 1 , wherein the switch controller includes:a pulse generator generating an output drive signal at a first logic state during the part of the switching cycle during which the switch is turned on and a second logic state during another part of the switching cycle during which the switch is turned off; anda dynamic switch drive module receiving the output drive signal and dynamically adjusting the magnitude of the switch drive signal.3. The switching power converter of claim 1 , wherein the dynamic switch drive module adjusts the magnitude of the switch drive signal to be at a predetermined level for a predetermined period of time at a beginning of the part of the switching cycle during which the switch is turned on.4. The switching power converter of claim 3 , wherein the predetermined period of time is fixed according to device characteristics of one or more components of the switching power converter.5. The switching ...

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Номер записи: 90
31-10-2013 дата публикации

METHOD AND APPARATUS FOR IMPLEMENTING AN UNREGULATED DORMANT MODE IN A POWER CONVERTER

Номер: US20130286691A1
Автор: Matthews David Michael Hugh
Принадлежит:

A power converter controller includes a drive signal generator coupled to generate a drive signal to control switching of a power switch to regulate a flow of energy to a power converter output in response to an energy requirement of a load. A voltage supply rail is coupled to supply a voltage to the drive signal generator. The supplied voltage is used by the drive signal generator to generate the drive signal. A control circuit is coupled to generate a power down signal that stops the supply of the voltage to the drive signal generator to stop the generation of the drive signal and the control of the switching of the power switch for a period of time. Timer circuitry determines a duration of the period of time and triggers the control circuit to restart the supply of the voltage by the supply rail to the drive signal generator. 1. A power converter controller comprising:a drive signal generator coupled to generate a drive signal and thereby control switching of a power switch to regulate a flow of energy to a power converter output in response to an energy requirement of a load to be coupled to the power converter output;a voltage supply rail coupled to supply a voltage to the drive signal generator, the supplied voltage used by the drive signal generator to generate the drive signal and control the switching of the power switch;a control circuit coupled to generate a power down signal that stops the supply of the voltage by the voltage supply rail to the drive signal generator, thereby stopping the generation of the drive signal and the control of the switching of the power switch for a period of time; andtimer circuitry to determine a duration of the period of time and trigger the control circuit to restart the supply of the voltage by the supply rail to the drive signal generator.2. The power converter of claim 1 , wherein the timer circuitry is coupled to be supplied with voltage by the supply rail even when the supply of the voltage to the drive signal ...

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Номер записи: 91
07-11-2013 дата публикации

CONVERSION STAGE, ELECTRIC CONVERTER INCLUDING SUCH A CONVERSION STAGE, DEVICE FOR CONVERTING AN AC CURRENT INTO DC CURRENT INCLUDING SUCH A CONVERTER, TERMINAL FOR RECHARGING AN ELECTRIC BATTERY INCLUDING SUCH A CONVERTER OR CONVERSION DEVICE

Номер: US20130293193A1
Автор: GAILLA Charles, Meysenc Luc
Принадлежит: Schneider Electric Industries SAS

The electric conversion stage according to the invention can be connected on one hand to intermediate terminals of a DC voltage electric bus, and on the other hand to output terminals. It comprises P switching branches, P≧2, the switching branches being connected in parallel between the intermediate terminals, each switching branch including first and second controllable electronic switches connected serially and connected to each other by a midpoint, each switch including a semiconductor switching element and a diode connected in anti-parallel to the semiconductor element, and means for controlling the electronic switches according to a control law. 1. An electric conversion stage , capable of being connected on one hand to intermediate terminals of a DC voltage electric bus , and on the other hand to output terminals , the conversion stage comprising:P switching branches, P being greater than or equal to 2, the switching branches being connected in parallel between the intermediate terminals, each switching branch including first and second controllable electronic switches connected serially and connected to each other by a midpoint, the first switch being connected between the first intermediate terminal and the corresponding midpoint, and the second switch being connected between the second intermediate terminal and the corresponding midpoint, each switch including a semiconductor element and a diode connected in anti-parallel to the semiconductor element, each semiconductor element being switchable between an on state and an off state,control means for controlling the electronic switches according to a control law,wherein the conversion stage also comprises a capacitor connected between the two output terminals and, for each switching branch, an electromagnetic coil connected between a terminal of the capacitor and the midpoint of the corresponding switching branch, andwherein the control law is selected from among a first control law and a second control law, ...

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Номер записи: 92
07-11-2013 дата публикации

Direct-Current Converter

Номер: US20130294114A1
Автор: Nakanishi Ryouta
Принадлежит: Sanken Electric Co., Ltd.

A direct-current converter comprises: a first series circuit, which is connected in parallel with a smoothing capacitor and in which a first switching element and a second switching element are connected in series; a second series circuit, which is connected in parallel between main electrodes of the first switching element and in which a resonance capacitor, a resonance reactor and a primary winding of a transformer are connected in series; a half wave rectification smoothing circuit, which rectifies and smoothes a voltage of a secondary winding of the transformer; a control circuit configured to alternately turn on and off the first switching element and second switching element, based on art output voltage of the rectification smoothing circuit; and a third series circuit, which is connected in parallel with the second switching element and in which a boost reactor and a direct-current power supply are connected in series. 1. A direct-current converter comprising:a first series circuit, which is connected in parallel with a smoothing capacitor and in which a first switching element and a second switching element are connected in series;a second series circuit, which is connected in parallel between main electrodes of the first switching element and in which a resonance capacitor, a resonance reactor and a primary winding of a transformer are connected in series;a half wave rectification smoothing circuit, which rectifies and smoothes a voltage of a secondary winding of the transformer;a control circuit configured to alternately turn on and off the first switching element and second switching element, based on an output voltage of the rectification smoothing circuit; anda third series circuit, which is connected in parallel with the second switching element and in which a boost reactor and a direct-current power supply are connected in series.2. The direct-current converter according to claim 1 ,wherein the control circuit performs frequency control with fixing an ...

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Номер записи: 93
07-11-2013 дата публикации

AUTOMATIC ADJUSTING DEVICE FOR OUTPUT POWER

Номер: US20130294116A1
Автор: PAN JUI-HSIANG, Tzeng Ming-Zhi
Принадлежит:

An automatic adjusting device is provided, which is used for adjusting an output power of a power supply and comprises an automatic adjusting circuit. The automatic adjusting circuit includes a comparing unit and a programmable signal generating unit. The comparing unit compares a limiting level and a protection level and produces a comparison signal. The protection level limits the output power provided by the power supply. The programmable signal generating unit generates the protection level and adjusts the protection level according to the comparison signal for adjusting the output power. The programmable signal generating unit will adjust the protection level according to the limiting level. Thereby, the output power can be adjusted automatically without manual adjustment. Consequently, the cost can be reduced and the adjusting accuracy can enhanced. 1. An automatic adjusting device used for adjusting an output power of a power supply , comprising an automatic adjusting circuit , and said automatic adjusting circuit including:a comparing unit, comparing a limiting level and a protection level for producing a comparison signal, and said protection level limiting said output power provided by said power supply; anda programmable signal generating unit, generating said protection level, and adjusting said protection level according to said comparison signal for adjusting said output power.2. The automatic adjusting device as claimed in claim 1 , further comprising a test load coupled to said power supply claim 1 , said test load drawing said output power according to a set value for producing said limiting level claim 1 , and the level of said output power provided to said test load by said power supply corresponding to said set value.3. The automatic adjusting device as claimed in claim 2 , wherein said automatic adjusting circuit further includes a sensing device coupled to said comparing unit and an output of said power supply claim 2 , said sensing device ...

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Номер записи: 94
07-11-2013 дата публикации

METHOD AND APPARATUS FOR CONTROLLING THE MAXIMUM OUPUT POWER OF A POWER CONVERTER

Номер: US20130294117A1
Автор: Bircan Erdem, Djenguerian Alex B.
Принадлежит:

An example control circuit for use in a power converter includes an input voltage sensor, a current sensor, and a drive signal generator. The input voltage sensor generates a first signal representative of an input voltage (Vin) of the power converter. The current sensor generates a second signal representative of a switch current through a power switch of the power converter. The drive signal generator generates a drive signal to control switching of the power switch in response to the first and second signals. The drive signal generator sets a switching frequency of the drive signal based on a product K×Vin×t to control a maximum output power of the power converter, where K is a fixed number and t is a time it takes the second signal to change between two values of the switch current when the power switch is in an on state. 1. A control circuit for use in a power converter , the control circuit comprising:an input voltage sensor coupled to generate a first signal representative of an input voltage (Vin) of the power converter;a current sensor coupled to generate a second signal representative of a switch current through a power switch of the power converter; anda drive signal generator configured to generate a drive signal to control switching of the power switch in response to the first and second signals, wherein the drive signal generator sets a switching frequency of the drive signal based on a product K×Vin×t to control a maximum output power of the power converter, wherein K is a fixed number and t is a time it takes the second signal to change between two values of the switch current when the power switch is in an on state.2. The control circuit of claim 1 , wherein the fixed number K is substantially equal to 1 to compensate for variances in an inductance value of an energy transfer element of the power converter.3. The control circuit of claim 1 , wherein the fixed number K is substantially equal to 2 to compensate for variances in a protective current ...

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Номер записи: 95
14-11-2013 дата публикации

SWITCHING POWER SUPPLY DEVICE

Номер: US20130301306A1
Автор: HOSOTANI Tatsuya
Принадлежит:

In a switching power supply device with reduced size and increased power conversion efficiency, a secondary-side rectifier circuit includes an adder-rectifier circuit that stores a voltage generated in a secondary winding in a capacitor as electrostatic energy in an on period of one of a high-side and low-side switching circuits or, and adds the voltage in the capacitor and the voltage generated in the secondary winding and outputs the sum as a direct-current voltage during in an on period of the other of the high-side and low-side switching circuits. A switching control circuit adjusts an output power to be output from the secondary-side rectifier circuit, by using on-period ratio controller that controls a proportion of periods during which the respective high-side side and low-side switching elements are brought into a conductive state. 117-. (canceled)18. A switching power supply device comprising:a transformer including a primary winding and a secondary winding;a primary-side alternating-current voltage generating circuit electrically connected to the primary winding and including high-side and low-side switching circuits, the primary-side alternating-current voltage generating circuit generating an alternating-current voltage having a substantially square or trapezoidal wave shape from an input direct-current voltage;a secondary-side rectifier circuit that rectifies the alternating-current voltage into a direct-current voltage;a first LC series resonant circuit on a primary side, the first LC series resonant circuit including a first series resonant inductor and a first series resonant capacitor; anda switching control circuit that performs control to alternately turn on and off the high-side and low-side switching circuits of the primary-side alternating-current voltage generating circuit with a dead time; whereinthe secondary-side rectifier circuit includes an adder-rectifier circuit configured to store a voltage generated in the secondary winding in a ...

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Номер записи: 96
14-11-2013 дата публикации

RESONANT POWER CONVERTER

Номер: US20130301307A1
Автор: Gröninger Mark, KARDOLUS Menno, Schijffelen Jos, Van Casteren Dolf
Принадлежит: ABB B.V.

A resonant power converter includes a resonance tank formed by a capacitance component and an inductance component, at least two switches connected to the resonance tank and a voltages source in a bridge configuration, a number of snubber capacitors connected in parallel to each of the switches, a controller configured to control ON and OFF timings of the at least two switches so as to excite the resonance tank, and a voltage sensor configured to sense a voltage drop across at least one of the switches. The controller is configured to switch the at least one of the switches to the ON state when the absolute value of the sensed voltage drop reaches a minimum. 1. A resonant power converter comprising:a resonance tank formed by a capacitance component and an inductance component;at least two switches connected to the resonance tank and a voltage source in a bridge configuration;a plurality of snubber capacitors connected in parallel to each of the switches;a controller configured to control ON and OFF timings of the at least two switches so as to excite the resonance tank; anda voltage sensor configured to sense a voltage drop across at least one of the switches,wherein the controller is configured to switch the at least one of the switches to the ON state when the absolute value of the sensed voltage drop reaches a minimum.2. The converter according to claim 1 , wherein the controller is configured to determine switch timings of the switches into the OFF state on the basis of a clock signal with a given frequency.3. The converter according to claim 2 , wherein the clock signal is synchronized with one of an AC input voltage and a fluctuating DC input voltage.4. The converter according to claim 2 , wherein the frequency is variable for adjusting at least one of an output power an output current of the converter to a given demand.5. The converter according to claim 1 , wherein the controller has a mode of operation in which isolated ON periods of the at least two ...

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Номер записи: 97
14-11-2013 дата публикации

SWITCHING POWER SUPPLY DEVICE

Номер: US20130301308A1
Автор: HOSOTANI Tatsuya
Принадлежит:

In a switching power supply device with reduced size and increased power conversion efficiency, a first resonant circuit including a series resonant inductor and a series resonant capacitor, and a second resonant circuit including a series resonant inductor and a series resonant capacitor, are caused to resonate with each other to cause sympathetic vibration of each resonant circuit, such that transmission is performed by utilizing both magnetic field coupling and electric field coupling between a primary winding and a secondary winding. Operation at a switching frequency higher than a specific resonant frequency of an overall multi-resonant circuit allows a ZVS operation to be performed, enabling a significant reduction in switching loss and high-efficiency operation. 115-. (canceled)16. A switching power supply device comprising:an electromagnetic field coupling circuit including a primary winding and a secondary winding;a primary-side alternating-current voltage generating circuit including switching circuits connected to the primary winding, each of the switching circuits including a parallel connection circuit which includes a switching element, a diode, and a capacitor, the primary-side alternating-current voltage generating circuit generating an alternating-current voltage from an input direct-current voltage;a secondary-side rectifier circuit that rectifies the alternating-current voltage into a direct-current voltage;a first resonant circuit on a primary side, the first resonant circuit including a first series resonant inductor and a first series resonant capacitor;a second resonant circuit on a secondary side, the second resonant circuit including a second series resonant inductor and a second series resonant capacitor; anda switching control circuit that alternately turns on and off the switching elements of the primary-side alternating-current voltage generating circuit with a dead time to generate an alternating-current voltage having a substantially ...

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Номер записи: 98
14-11-2013 дата публикации

SWITCHING MODE POWER SUPPLY AND THE METHOD THEREOF

Номер: US20130301311A1
Автор: Ren Yuancheng, Wang Siran, Zhang Junming
Принадлежит: Chengdu Monolithic Power Systems Co., Ltd.

A switching mode power supply, having: an input port; an output port; an energy storage component and a pair of power switches coupled between input port and the output port; an error amplifier configured to generate an amplified error signal based on the feedback signal and the reference signal; an error comparator configured to generate a frequency control signal based on the amplified error signal and the first sawtooth signal; a peak current generator configured to generate a peak current signal based on the frequency control signal; a peak current comparator configured to generate a current limit signal based on the peak current signal and the current sense signal; and a logic circuit configured to generate a switching signal to control the power switches based on the frequency control signal and the current limit signal. 1. A switching mode power supply , comprising:an input port configured to receive an input voltage;an output port configured to provide an output voltage to a load;an energy storage component and a power switches coupled between the input port and the output port;an error amplifier having a first input terminal configured to receive a feedback signal indicative of the output voltage, a second input terminal configured to receive a reference signal, and an output terminal configured to generate an amplified error signal based on the feedback signal and the reference signal;an error comparator having a first input terminal configured to receive the amplified error signal, a second input terminal configured to receive a first sawtooth signal, and an output terminal configured to generate a frequency control signal based on the amplified error signal and the first sawtooth signal;a peak current generator having an input terminal coupled to the output terminal of the error comparator to receive the frequency control signal, and an output terminal configured to generate a peak current signal based on the frequency control signal;a peak current ...

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Номер записи: 99
14-11-2013 дата публикации

ISOLATED SWITCHING POWER SUPPLY APPARATUS

Номер: US20130301312A1
Автор: KONISHI Masanori, NISHIYAMA Takayoshi
Принадлежит:

An isolated switching power supply apparatus includes a transformer, a primary-side circuit that includes at least a switching element and supplies input power from an input terminal to a primary winding by controlling on/off of the switching element, and a secondary-side circuit that is electrically isolated from the primary-side circuit and that outputs output power resulting from power conversion performed by the transformer from a secondary winding to an output terminal. The apparatus includes a first circuit board to which the primary winding is connected and that includes the primary-side circuit and the input terminal, and a second circuit board to which the secondary winding is connected and that includes the secondary-side circuit and the output terminal. The first and second circuit boards are stacked in a multilayer manner. The primary and secondary windings are arranged around a core that extends through the first and second circuit boards. 1. (canceled)2. An isolated switching power supply apparatus comprising:a transformer that includes a primary winding, a secondary winding, and a core;a primary-side circuit that includes at least a switching element and supplies input power from an input terminal to the primary winding by controlling on/off of the switching element;a secondary-side circuit that is electrically isolated from the primary-side circuit and outputs, from the secondary winding to an output terminal, output power resulting from power conversion performed by the transformer;a first circuit board to which the primary winding is connected and that includes the primary-side circuit and the input terminal; anda second circuit board to which the secondary winding is connected and that includes the secondary-side circuit and the output terminal; whereinthe first circuit board and the second circuit board are stacked in a multilayer manner, and the core extends through the first circuit board and the second circuit board such that both the primary ...

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Номер записи: 100