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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 26097. Отображено 100.
05-01-2012 дата публикации

Drive Circuit with Integrated Power Factor Correction for Blender/Shaver Machine

Номер: US20120001002A1
Автор: Ronald Flanary, Scott B. Donaldson
Принадлежит: Individual

Embodiments of the invention provide a machine that blends liquids and/or shaves ice. The machine includes a motor and a control system with an integrated power factor correction circuit and a drive circuit. The integrated power factor correction circuit receives input power from a mains power line, reduces noise transmitted to the mains power line, and provides a boosted, regulated output voltage. The drive circuit is connected to the motor and uses the regulated output voltage in order to control an effective voltage applied to the motor substantially independent of the voltage and frequency of the input power.

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Номер записи: 1
05-01-2012 дата публикации

Gate drive controller circuit with anti-saturation circuit and power up circuit therefor

Номер: US20120002447A1
Автор: Bo Zhang, Gang Yao, Ting Zhang
Принадлежит: General Electric Co

A high side isolated gate drive controller circuit is presented with an on-time limiting circuit to prevent isolation transformer saturation as well as a universal power up circuit adaptable to power the driver with constant voltage for different input voltage levels.

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Номер записи: 2
19-01-2012 дата публикации

Adaptive on-time control for power factor correction stage light load efficiency

Номер: US20120014148A1
Автор: Chuanyun Wang, Fred C. Lee, Ming Xu, QIAN LI
Принадлежит: Virginia Tech Intellectual Properties Inc

Light load efficiency of a power factor correction circuit is improved by adaptive on-time control and providing for selection between a continuous conduction mode and a discontinuous conduction mode wherein the discontinuous conduction mode increases time between switching pulses controlling connection of a cyclically varying voltage to a filter/inductor that delivers a desired DC voltage and thus can greatly reduce the switching frequency at light loads where switching frequency related losses dominate efficiency. The mode for controlling switching is preferably selected for each switching pulse within a half cycle of the cyclically varying input voltage. A multi-phase embodiment allows cancellation of EMI noise at harmonics of the switching frequency and adaptive change of phase angle allows for cancellation of dominant higher order harmonics as switching frequency is reduced.

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Номер записи: 3
19-01-2012 дата публикации

Method for controlling switching power unit

Номер: US20120014152A1
Автор: Takashi Kawai, Yoshihiro Nakamura
Принадлежит: Minebea Co Ltd

There is provided a method for controlling a switching power unit that converts AC input voltages of an AC source into a DC voltages while improving a power-factor of the AC input voltages, the switching power unit comprising an AC/DC converter circuit that is composed of a power-factor correction unit and a current resonance converter unit wherein at least a part of switching elements of the current resonance converter unit is shared with switching elements of the power-factor correction unit, wherein around timing that polarities of the AC source are switched between a positive half cycle and a negative half cycle, ON-and-OFF control of the switching elements are performed as that high frequency voltages that are applied to a primary winding of a high frequency transformer which is a part of the current resonance converter unit are to be symmetrical in a positive and negative relation.

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Номер записи: 4
02-02-2012 дата публикации

Adaptive current limiter and dimmer system including the same

Номер: US20120026761A1
Автор: James Roy Young
Принадлежит: Individual

In an embodiment, an adaptive current limiter includes a sense element, a current pass element, and a controller. The sense element includes a first sense terminal coupled to a power supply terminal and a second sense terminal. The sense element generates a sense voltage in response to a feedback current. The current pass element includes a first terminal for receiving the feedback current, a second terminal coupled to the second sense terminal, and a control terminal. The controller is coupled to the sense element and to the control terminal for adjusting the feedback current conducted by the current pass element based on the sense voltage and a time-varying voltage signal.

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Номер записи: 5
12-04-2012 дата публикации

Switching Power Supply Circuit with Reduced Total Harmonic Distortion

Номер: US20120086411A1
Автор: Laszlo A. Takacs
Принадлежит: Energy Focus Inc

A switching power supply circuit has a control circuit for current-mode on-off control of a primary switch connected to an inductor in a voltage boost topology for operation in boundary-conduction mode. The time at which the primary switch is opened is determined by magnitude of current flowing through the primary switch together with the instantaneous voltage present on an AC input to the power supply circuit. The time at which the primary switch is closed is determined by demagnetization of the inductor. An improvement to the foregoing switching power supply circuit comprises a maximum-on-time enforcement circuit to limit the maximum possible primary switch on-time to a predetermined maximum period of time. The enforcement circuit provides a signal to the control circuit to cause termination of the primary switch on-state if and only if the primary switch has been turned on for more than the predetermined maximum period of time.

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Номер записи: 6
12-04-2012 дата публикации

Ac-dc converter

Номер: US20120087155A1
Автор: Chung-Hei Poon, Kwong-Ming Ching, Pak-Chuen Tang
Принадлежит: Delta Electronics Inc

An AC-DC converter is disclosed. The AC-DC converter includes an OFF-time clamping circuit. The OFF time clamping circuit outputs a triggering signal when a main switch circuit of the AC-DC converter is switched from ON state to OFF state. When an input AC voltage is too small, and a terminal voltage at a first current-conducting terminal of the main switch circuit of the AC-DC converter is lower than a specific voltage such that a switching control circuit can not turn on the main switch circuit again, the switching control circuit can still turn on the main switch circuit again by the triggering signal. Therefore, the OFF time of the main switch circuit is clamped. The switching control circuit can control the switching operation of the main switch circuit.

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Номер записи: 7
26-04-2012 дата публикации

Three-level active rectification pulse width modulation control

Номер: US20120099349A1
Автор: John Duward Sagona
Принадлежит: Hamilton Sundstrand Corp

An active rectification system includes a three-level active rectifier and a pulse with modulation (PWM) control portion. The three-level active rectifier includes at least three switches, the at least three switches are selectively switchable between an upper state, a center state, and a lower state. The PWM control portion is in communication with the at least three switches, the PWM control portion is configured and disposed to create an upper carrier signal and a lower carrier signal, and the PWM control portion is configured and disposed to selectively switch the at least three switches between the upper state, the center state, and the lower state in response to a phase disposition of the upper carrier signal and the lower carrier signal.

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Номер записи: 8
03-05-2012 дата публикации

Power factor and line distortion method and apparatus

Номер: US20120106211A1
Автор: David Freeman, Fernando Mujica, Marco Corsi
Принадлежит: Texas Instruments Inc

Today, power distribution systems can be used to supply power to many loads, and since many loads, such as servers, are reactive (i.e., have capacitors and/or inductors), line distortion and power factor can be an issue. Conventional techniques to correct for line distortion and power factor use a specialized circuit that is generally in series with the load, but these specialized circuits can be prohibitively expensive when used in large numbers. Here, however, a corrective power supply has been provided, which can correct for other parallel power supplies that can reduce cost.

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Номер записи: 9
10-05-2012 дата публикации

Low cost power supply circuit and method

Номер: US20120112657A1
Автор: Geert Willem Van Der Veen, Jeroen Snelten
Принадлежит: KONINKLIJKE PHILIPS ELECTRONICS NV

A power supply circuit has an LLC converter stage for converting a DC voltage input into a DC voltage output, and at least one hysteretic converter stage. Each hysteretic converter stage has a DC voltage input coupled to the DC voltage output of the LLC converter stage, and a DC current output. The LLC converter stage lacks a feedback control, and is operated at its load independent point. A ripple on the DC voltage output of the LLC converter does not affect the output current of the hysteretic converter stage. The stable DC current output of the hysteretic converter stage is coupled to a load having one or more LED strings.

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Номер записи: 10
10-05-2012 дата публикации

Switching power supply with self-optimizing efficiency

Номер: US20120112720A1
Автор: Guido Remmert
Принадлежит: Phoenix Contact GmbH and Co KG

A switching power supply is provided that includes: input terminals for the uptake of an input power, output terminals for providing an output power, a circuit disposed between the input and output terminals for transforming the input power and having at least one controllable switch, a control unit for controlling the at least one controllable switch by means of at least one pulse-width modulation signal having variable frequency and variable duty cycle, and having measuring instruments connected to control unit, designed for at least measuring the input current intensity, the input voltage, the output current intensity, and the output voltage, wherein control unit is designed for the purpose of monitoring the efficiency of switching power supply by means of measurement values of the connected measuring instruments, and of optimizing the efficiency by controlling the at least one controllable switch by means of a first digital control loop. Also provided is a method for operating a switching power supply.

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Номер записи: 11
07-06-2012 дата публикации

Active rectification control

Номер: US20120140537A1
Автор: Souren G. Fattal
Принадлежит: Hamilton Sundstrand Corp

An active rectification system includes an active rectifier, a pulse width modulation (PWM) control, and a closed loop vector control. The PWM control portion is configured to control switching of the active rectifier and the closed loop vector control is configured to generate the required duty cycles for the PWM signals that regulate the DC voltage output and force a three-phase current input of the active rectifier to align with a three-phase pole voltage input of the active rectifier.

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Номер записи: 12
14-06-2012 дата публикации

Method and apparatus providing universal voltage input for solid state light fixtures

Номер: US20120146529A1
Автор: Gregory Campbell, Igor Shikh
Принадлежит: KONINKLIJKE PHILIPS ELECTRONICS NV

A method for providing universal voltage input to a solid state lighting fixture ( 140 ) supplied by an AC line voltage includes converting an analog voltage signal corresponding to the line voltage to digital values indicating a waveform of the line voltage (S 312 ) and calculating slopes corresponding to rising edges of the waveform using select values of the digital values (S 453 ). A value of the line voltage is determined based on the calculated slopes (S 458 ).

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Номер записи: 13
05-07-2012 дата публикации

Semi resonant switching regulator, power factor control and led lighting

Номер: US20120169240A1
Автор: Alistair Allan Macfarlane
Принадлежит: Individual

Described are improvements in power factor control and systems embodying said improved power factor control. Improvements lie in a method of zero voltage switching in which a capacitor is placed in parallel with a switching device, and the switching device is operated responsive to a change in the polarity of the current through the capacitor. Switching therefore occurs at zero or close to zero voltage across the switching device in both on and off modes resulting in very low switching losses and electromagnetic interference. Systems employing the method include a power factor controller, LED light source, boost converter and a power source comprising one or more photovoltaic cells.

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Номер записи: 14
02-08-2012 дата публикации

Jittering frequency control circuit and method for a switching mode power supply

Номер: US20120194227A1
Автор: Kun-Yu Lin, Pei-Lun Huang
Принадлежит: Richpower Microelectronics Corp

A jittering frequency control circuit and method for a switching mode power supply enlarge the uttering frequency range of the switching frequency of the switching mode power supply when the switching mode power supplier enters a frequency reduction mode, to improve the electro-magnetic interference of the switching mode power supply operating with the frequency reduction mode.

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Номер записи: 15
02-08-2012 дата публикации

Systems and Methods for High Speed Power Factor Correction

Номер: US20120195082A1
Автор: Robert Stephen Wrathall
Принадлежит: Individual

Systems and methods described herein provide for high speed power factor correction which can overcome or substantially alleviate the problems associated with changes in the operating conditions of a load or other transient events. The present technology senses the present state conditions of a signal to quickly and accurately determine the presence of an overtone component within the signal. The expected value of the overtone component is then determined based on the sensed state of the signal. Power factor correction is then performed to suppress the overtone utilizing a control signal formed based on the expected value of the overtone. By performing power factor correction based on the expected value, the present technology can provide high speed power factor correction which is not limited by the delay introduced by an adaptive feedback loop.

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Номер записи: 16
23-08-2012 дата публикации

Input current shaping for transition and discontinuous mode power converter

Номер: US20120212276A1
Автор: Ivan Feno, Silvio Ziegler
Принадлежит: Power One Inc

A power converter operable to draw an input current that is in phase with an input voltage of the power converter and proportional to a voltage of the input voltage of the power converter includes a drive switch, a waveform generator, and a current shaping circuit. The drive switch is connected between an input inductor and ground and draws current through the input inductor when turned on. The current shaping circuit provides an on-time of the drive switch for a next cycle of the drive switch as a function of an input current decay time, a switching period of the waveform generator, and an output voltage of the power converter. The waveform generator is responsive to the on-time provided by the current shaping circuit for selectively turning the drive switch on and off to cycle the drive switch as a function of the received on-time.

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Номер записи: 17
13-09-2012 дата публикации

Two-Peak Current Control for Flyback Voltage Converters

Номер: US20120230065A1
Автор: Hao Peng, Jinho Choi, Tuyen DOAN, Wanfeng Zhang
Принадлежит: MARVELL WORLD TRADE LTD

A system including a switch configured to supply power to a load. A first comparator is configured to compare a first current through the switch to a first threshold. A second comparator is configured to compare the first current through the switch to a second threshold. The second threshold is greater than the first threshold. A current control module is configured to turn off the switch (i) for a first duration in response to the first current through the switch being greater than or equal to the first threshold and (ii) for a second duration in response to the first current through the switch being greater than or equal to the second threshold. The current control module is configured to adjust the second duration based on a difference between an estimated current through the load and a desired current through the load.

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Номер записи: 18
27-09-2012 дата публикации

Fixed-on-time controller utilizing an adaptive saw signal for discontinuous mode pfc power conversion

Номер: US20120242298A1
Автор: Yu-Ping Chu
Принадлежит: Grenergy Opto Inc

A fixed-on-time controller utilizing an adaptive saw signal for discontinuous mode PFC power conversion, the fixed-on-time controller comprising: an error amplifier, having a negative input end coupled to a feedback signal, a positive input end coupled to a reference voltage, and an output end for providing a threshold signal; an adaptive current source generator, used to generate an adaptive current source according to the threshold signal; a capacitor, charged by the adaptive current source, being used for carrying a saw signal; a switch, used to discharge the capacitor under the control of a reset signal; and a comparator, having a negative input end coupled to the threshold signal, a positive input end coupled to the saw signal, and an output end for providing a turn-off signal; and a fixed-on-time driver circuit, used to provide a driving signal and the reset signal according to the turn-off signal and a sensing signal.

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Номер записи: 19
04-10-2012 дата публикации

Power supplying device and image forming apparatus having the same

Номер: US20120250357A1
Автор: Junichi Masuda, Mikiyuki Aoki, Takahiro Yokoya, Taku Kimura
Принадлежит: KONICA MINOLTA BUSINESS TECHNOLOGIES INC

A power supplying device provides power to the body of an image forming apparatus and an optional device connected to the body of the same. The power supplying device comprises: a rectifier circuit which rectifies an alternating current inputted from an alternating-current source; a booster circuit which boosts and smooths the direct-current voltage caused by the rectifier circuit; a judgment portion which judges whether or not there is an optional device connected to the body of the image forming apparatus; an identification portion which identifies the type of the optional device connected thereto; and a controller which, if there is an optional device connected thereto according to the judgment portion, adjusts the boosted voltage obtained by the booster circuit to a higher value than that if there is no optional device connected thereto, which depends on the type of the optional device identified by the identification portion.

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Номер записи: 20
11-10-2012 дата публикации

Active rectification output capacitors balancing algorithm

Номер: US20120257427A1
Автор: Souren G. Fattal
Принадлежит: Hamilton Sundstrand Corp

An active rectification system includes an active rectifier that converts an alternating current (AC) input to a direct current (DC) output. The active rectifier includes a plurality of switching devices and at least a first output capacitor and a second output capacitor connected at the DC output of the active rectifier. A controller includes a DC output regulation portion and an output capacitor balancing portion, wherein the DC output regulation portion monitors the DC output and in response generates control signals for regulating the DC output to a desired value. The output capacitor balancing portion monitors first and second output capacitor voltages associated with the first and second output capacitors, respectively, and generates an accumulated adjustment value that modifies the control signals provided by the DC output regulation portion to balance the first and second output capacitor voltages.

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Номер записи: 21
08-11-2012 дата публикации

Power factor correction circuit

Номер: US20120281448A1
Автор: Xiaoru Xu
Принадлежит: Hangzhou Silergy Semiconductor Technology LTD

The present invention relates to a power factor correction circuit, that can include: an inductor current detector that generates a sampling voltage signal, and sinusoidal half-wave current and voltage signals based on the sampling voltage signal; a mediate signal generator generating slope voltage and clock signals in response to the sinusoidal half-wave voltage signal, where a frequency of each varies with the sinusoidal half-wave voltage signal; a current modulation circuit receiving the sinusoidal half-wave current signal and a voltage feedback signal representative of a power stage output voltage to generate a regulation signal that is compared against the slope voltage signal to generate a modulation signal; and a logic/driving circuit receiving the modulation and clock signals, and generating a controlling signal that controls a power switch with variable frequency to maintain the inductor current in phase with the sinusoidal half-wave voltage signal and the power stage output voltage constant.

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Номер записи: 22
22-11-2012 дата публикации

Multi-output dc-to-dc conversion apparatus with voltage-stabilizing function

Номер: US20120292996A1
Автор: Chang-Chieh Yu, Cheng-Yi Lo
Принадлежит: Individual

A multi-output DC-to-DC conversion apparatus with a voltage-stabilizing function includes a center-tapped main transformer, a semiconductor component group, and a triggering controller. The DC-to-DC conversion apparatus provides at least two output voltages which are a main output voltage and an auxiliary output voltage, respectively. The auxiliary output voltage is functioned as an input voltage of a buck converter; and, as a result, the auxiliary output voltage can be adjusted to obtain a lower variable DC voltage. The triggering controller is used to stabilize the main output voltage and the auxiliary output voltage. Therefore, the main transformer provides one or two secondary windings to step down the auxiliary output voltage so as to increase efficiency of the buck converter.

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Номер записи: 23
22-11-2012 дата публикации

Phase-controlled ac voltage stabilizing circuit

Номер: US20120293142A1
Автор: Jui-Kun Huang
Принадлежит: Eneraiser Tech Co Ltd

A phase-controlled AC voltage stabilizing circuit includes a buffer device connected between an input power side and an exciting side of a transformer to provide flywheel paths of exciting current within the positive half cycle and negative half cycle of input power. A pulse width modulation control device is connected between the buffer device at the exciting side of the transformer and a neutral point of a power supply system to switch ON and OFF a number of times within each half cycle of the input power to allow an inductor to regulate the variable voltage so that waveform of the exciting current of the transformer is smoother. By regulating the voltage at the output side of the transformer, response time of stabilizing voltage is faster and distortion of the waveform is smaller.

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Номер записи: 24
29-11-2012 дата публикации

Device for power conversion using switching element

Номер: US20120300512A1
Автор: Kanretsu KIN, Shigeo HIRASHIMA, Shinya Goto
Принадлежит: Denso Corp, Toyota Motor Corp

A converter is provided as a power conversion device. The converter includes a switching circuit that performs switching on the basis of switching signals; and a control circuit that changes switching frequency of switching signals in a predetermined pattern with the elapse of time, and repeats the changes in switching frequency in the predetermined pattern at every repetition time. The converter sets the repetition time such that a repetition frequency that is the inverse of the repetition time does not coincide with a frequency band that can be demodulated as sound by a radio that receives radio broadcasts.

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Номер записи: 25
06-12-2012 дата публикации

Controller and method for transitioning between control angles

Номер: US20120306414A1
Автор: Charles E. Green, Joseph G. Marcinkiewicz
Принадлежит: Emerson Climate Technologies Inc

A system includes a control module that controls a motor based on a first rotor angle and an angle determination module that generates the first rotor angle. An estimator module determines an estimated rotor angle of the motor. A transition module generates a transition signal in response to convergence of the estimator module. The angle determination module initially generates the first rotor angle based on an open loop angle. In response to the transition signal, the angle determination module switches to generating the first rotor angle based on the estimated rotor angle and an offset value. The offset value is based on a difference between the estimated rotor angle and the open loop angle at the time when the transition signal is generated.

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Номер записи: 26
17-01-2013 дата публикации

Grounding method adapted for power supply

Номер: US20130014385A1
Автор: Chao Sun, Ming Xu
Принадлежит: FSP Powerland Technology Inc, FSP Technology Inc

A grounding method adapted for a power supply (for example, an adapter power supply, a three-phase AC-to-DC power supply, a DC-to-DC power supply, . . . , etc., but not limited thereto) is provided, and which includes: (a) providing a circuit body corresponding to the power supply, where the circuit body has an input part and an output part; (b) disposing the circuit body in a shielding layer; and (c) making at least one of the input part and the output part to be coupled with the shielding layer through at least one capacitor. In this case, the present invention can effectively solve the problem of common-mode interferences in the power supply.

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Номер записи: 27
17-01-2013 дата публикации

Switching power supply circuit

Номер: US20130015786A1
Автор: Kazuhiro Ohshita, Norio Sakae, Toshio Yabuki
Принадлежит: Daikin Industries Ltd

A reactor, a diode, and a switching element connected to a path constitute a booster circuit, and another reactor, another diode, and another switching element connected to another path constitute another booster circuit. The booster circuits also function as a power factor correction circuit for correcting a power factor of the input side. Swing chokes are adopted as the reactors.

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Номер записи: 28
17-01-2013 дата публикации

Power factor correction circuit

Номер: US20130016539A1
Автор: Kohei Nishibori, Nadthawut CHALERMBOON
Принадлежит: Minebea Co Ltd

A power factor correction circuit includes: the first series circuit consisting of the first rectifier element and the first switching element; the second series circuit consisting of the second rectifier element and the second switching element; the first/second reactors; and the first/second current detectors. The first/second current detectors have each the first/second transformers, both primary parts of which consist of the first/second reactors. The first and the second switching elements are controllable based on the first output signal according to the reactor current from the secondary side of the first transformer and the second output signal according to the reactor current from the secondary side of the second transformer so as to apply a desired DC voltage to the load circuit.

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Номер записи: 29
31-01-2013 дата публикации

Device and method for preventing wiretapping through power supply lines

Номер: US20130026845A1
Автор: Adam Owsianko, Albert Seloni, Avner Yefet, Rachel Dvash, Ron Mohel
Принадлежит: Adam Owsianko, Albert Seloni, Avner Yefet, Rachel Dvash, Ron Mohel

A anti-wiretapping device includes a power input, a power output for energizing anti-wiretapping electronic equipment, at least two dischargeable power storage units, and a control unit for selectively connecting the power storage units to the power input and to the power output, such that when one of the power storage units is connected to the power output it is switched off from the power input. At least one power storage unit is connected to the power input for charging during a connection of the other power storage unit to the power output for energizing the electronic equipment.

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Номер записи: 30
31-01-2013 дата публикации

Error voltage generation circuit, switch control circuit comprising the same, and power factor corrector comprising the switch control circuit

Номер: US20130027013A1
Автор: Ho Jae Lee, Jae-Yong Lee, Young Bae Park, Young-Je Lee
Принадлежит: Fairchild Korea Semiconductor Ltd

The present invention relates to an error voltage generation circuit, a switch control circuit, and a power factor corrector. The error voltage generation circuit generates an error voltage using an error input voltage corresponding to an output voltage of a power factor corrector and a soft start voltage. The error voltage generation circuit samples an error input voltage at an AC input supply time point of the power factor corrector and holes a sampling voltage according to the sampled error input voltage during a soft start period. The error voltage generation circuit generates a soft start voltage increasing from a start voltage corresponding to the sampling voltage. The switch control circuit controls a duty of a power switch of the power factor corrector using the error voltage.

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Номер записи: 31
31-01-2013 дата публикации

Pulse Frequency Modulation (PFM) Mode Lock Out for Regulators When Receive Signal Quality Is Low

Номер: US20130028300A1
Автор: Armin W. Klomsdorf, William P. Alberth
Принадлежит: MOTOROLA MOBILITY LLC

A method, power switching system, and communications device supply power in a pulse width modulation (PWM) mode to a transceiver whenever the transceiver processes a low quality signal. A power supply mode (PSM) utility/controller determines a quality of a signal that is currently being processed by a transceiver, and when the quality of the signal is less than a pre-set threshold level, the PSM controller triggers the power supply to operate exclusively in the PWM supply mode. However, when the quality of the signal satisfies a preset threshold level, the PSM controller enables the power supply to autonomously switch between the PFM supply mode and the PWM supply mode. In one embodiment, the controller dynamically determines a power demand by the transceiver and when the power demand exceeds a preset threshold demand level, the controller triggers the power supply to operate exclusively in the PWM supply mode.

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Номер записи: 32
28-02-2013 дата публикации

Device for judging imbalance current of dc-dc converter and method thereof

Номер: US20130054167A1
Автор: Hyongjoon Park
Принадлежит: Hyundai Motor Co

A device that determines a second side current imbalance of a DC-DC converter, wherein the second side is a center tap which includes a voltage measuring portion that measures a voltage drop of each connecting portion of the DC-DC converter, an average resistance calculating portion that calculates average resistance from the measured voltage drops, a saturation reference value calculating portion, and a saturation determination portion that compares the saturation reference value and the average resistance. By measuring the voltage drop of each contact portion after supplying a low voltage DC power to an output side, a determination can be made as to whether a product is saturated.

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Номер записи: 33
07-03-2013 дата публикации

Power factor correction apparatus and method

Номер: US20130057229A1
Автор: Manjing Xie, Zhixiang Liang
Принадлежит: INTERSIL AMERICAS LLC

The various embodiments may include a power supply having a first loop in communication with a power stage of the power supply. A second loop in communication with the first loop may generate a negative reactance value that increases a power factor for the power supply to approximately one. A power supply may also include a rectifier coupleable to an input supply. A power factor compensation circuit coupled to the rectifier may generate a negative reactance. The negative reactance may reduce a phase angle between a current and a voltage provided to the input supply. A method may include sensing an output of a power supply, and adjusting the sensed value. The adjusted value may be compared to a reference value to generate an error value. The error value and a negative reactance value may be combined and the result may be provided to the power supply.

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Номер записи: 34
07-03-2013 дата публикации

Electric device having an interference suppression capacitor circuit

Номер: US20130057231A1
Автор: Daniel N. Luthi, Fabien Maupas, Hans Hoffmann, Josef Fisch, Manfred Schlenk, Mykhaylo Raykhman, Yves Theoduloz
Принадлежит: EM Microelectronic Marin SA, Minebea Co Ltd

The invention describes an electrical device having at least one interference suppression capacitor ( 6, 60 ) that is actively discharged when there is an interruption to the mains voltage ( 7 ) by connecting an electrical load ( 69 ) in parallel. For this purpose, the device has means for monitoring the mains voltage ( 7 ) and means for connecting ( 68 ) the electrical load.

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Номер записи: 35
21-03-2013 дата публикации

Power adjustable, isolated and transformerless ac to dc power circuit

Номер: US20130070498A1
Автор: Tsung-Ein Tsai
Принадлежит: ANN CHENG ENTERPRISE CO Ltd

A power adjustable, isolated and tranformerless AC to DC power circuit is revealed. The AC to DC power circuit includes a first reactance component, a second reactance component, a third reactance component and an AC power connected to form a loop. The third reactance component is connected to an input end of a full bridge rectifier and a filter capacitor is connected across to an output end of the full bridge rectifier for output of a stable low voltage DC. Thereby AC power is isolated to avoid electric conductance or shock. Moreover, the manufacturing cost is dramatically reduced, the power is saved, and no heat is generated. Furthermore, the reactance of the whole circuit is reduced so as to get high power factor. The AC to DC power circuit has no high frequency radiation, no radiation damage and no interference to sensitive electronic equipment.

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Номер записи: 36
28-03-2013 дата публикации

Power Supply and Method of Operation

Номер: US20130077359A1
Автор: Lindemann Stig Alnøe, Nielsen Mads Kolding
Принадлежит: PR ELECTRONICS A/S

A switched-mode power supply (SMPS) and a method of control thereof is described, wherein the SMPS is operable to apply a spread spectrum modulation to a switching driver signal to reduce EMI in the SMPS. The SMPS is operable to perform voltage and current monitoring in parallel to the spread spectrum modulation to provide variable limit threshold detection and shutdown capabilities for circuit protection. 1. A method of controlling a switched-mode power supply , the power supply comprising a switching circuit for receiving a supply voltage and outputting a switched voltage , and a converter circuit coupled to said switching circuit and driven by said switched voltage to produce a required output voltage , the method comprising the steps of:providing a driving signal to said switching circuit to regulate the switching frequency of said switching circuit, andapplying a spread spectrum modulation to said driving signal to reduce electromagnetic interference in the power supply, wherein the method further comprises the steps of:monitoring the supply voltage to said switching circuit during operation of said switching circuit, andstopping the operation of said switching circuit if said monitored supply voltage falls below an operational voltage threshold value.2. A method as claimed in claim 1 , wherein the method further includes a start-up procedure for starting the operation of said switching circuit comprising:monitoring the supply voltage to said switching circuit when said switching circuit is not operational, andstarting said switching circuit when said monitored supply voltage exceeds a start-up voltage threshold value.3. A method as claimed in claim 2 , wherein said start-up voltage threshold value is greater than said operational voltage threshold value.4. A method as claimed in claim 1 , wherein the step of monitoring comprises:sampling a plurality of successive supply voltages,averaging said plurality of sampled supply voltages to provide an averaged supply ...

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Номер записи: 37
28-03-2013 дата публикации

Commutator for bridgeless pfc circuit

Номер: US20130077371A1
Автор: Chien-Ta Liang, Marcos Agoo Liquicia, Noel Vea Tangonan, Wendel Rodriguez Apuang
Принадлежит: Compuware Technology Inc

The commutator for a bridgeless PFC circuit is characterized in that a synchronous half-wave rectifier is connected between a bridgeless PFC boost circuit and an AC power source and is coupled to the two terminals of the AC power source. The synchronous half-wave rectifier contains a first synchronous transistor, a second synchronous transistor, and a control circuit.

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Номер записи: 38
18-04-2013 дата публикации

Coordinated power converter system

Номер: US20130093243A1
Автор: Henrik ISAKSSON, Martin Svensson, Sverker Sander
Принадлежит: Telefonaktiebolaget LM Ericsson AB

The present invention relates to a switched power converter system ( 1 ), comprising at least a first power converter ( 2 ) and a second power converter ( 3 ). Each power converter ( 2, 3 ) has a corresponding input terminal ( 4 a, 5 a) and output terminal ( 4 b, 5 b ), where each power converter ( 2, 3 ) comprises a corresponding switch arrangement ( 6, 7 ). The system further comprises a control unit ( 8 ) that at least at start-up is connected to each power converter ( 2, 3 ) in the system ( 1 ) and arranged to control each switch arrangement ( 6, 7 ) by means of spread spectrum modulation, such that cross correlation between the conducted or radiated emissions of the switch arrangements ( 6, 7 ) is avoided.

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Номер записи: 39
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: 40
16-05-2013 дата публикации

Management of common mode noise frequencies in portable electronic devices

Номер: US20130121031A1
Автор: Nicholas A. Sims
Принадлежит: Apple Inc

The disclosed embodiments provide a system that facilitates the use of a portable electronic device. During operation, the system detects a coupling of a power supply to the portable electronic device through a set of wires. Next, the system uses the set of wires to identify a type of the power supply. The system then periodically determines a switching frequency of the power supply based on the type of the power supply and a current drawn from the power supply. Finally, the system uses the switching frequency to facilitate the operation of a touch control in the portable electronic device. For example, if the switching frequency corresponds to a sensing frequency of the touch control, the system may change the sensing frequency to an alternative sensing frequency.

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Номер записи: 41
23-05-2013 дата публикации

POWER FACTOR CORRECTION CIRCUIT OF AN ELECTRONIC BALLAST

Номер: US20130127357A1
Автор: Wu Jun
Принадлежит: KONINKLIJKE PHILIPS ELECTRONICS N.V.

This invention relates to a power factor correction circuit of an electronic ballast. The electronic ballast includes a rectification circuit, a first capacitive element and an inverter. The power factor correction circuit comprises a unidirectional element, an inductive element and a second capacitive element. The unidirectional element is connected in series with the inductive element, and the second capacitive element is connected in parallel with the unidirectional element and the inductive element. A junction of the unidirectional element and the second capacitive element is coupled to a first output terminal of the rectification circuit, a junction of the inductive element and the second capacitive element is coupled to an input terminal of the inverter, and the first capacitive element is coupled between a second output terminal of the rectification circuit and a junction of the unidirectional element and the inductive element. It was found that a power factor correction circuit according to an embodiment of the present invention can increase the power factor of an electronic ballast to a high value, such as 0.98, while the size of the power factor correction circuit is small enough to be implemented in a small size lamp. 11201120130. A power factor correction circuit of an electronic ballast , the electronic ballast including a rectification circuit () for rectifying an AC input voltage , a first capacitive element (C) for smoothing an output voltage from the rectification circuit () and an inverter () , the power factor correction circuit comprising:{'b': '1', 'a unidirectional element (D), an inductive element (Lf) and a second capacitive element (Cf), wherein'}{'b': '1', 'the unidirectional element (D) is connected in series with the inductive element (Lf),'}{'b': '1', 'the second capacitive element (Cf) is connected in parallel with the unidirectional element (D) and the inductive element (Lf),'}{'b': 1', '1', '1', '2', '120, 'a junction (N) of the ...

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Номер записи: 42
06-06-2013 дата публикации

Semiconductor integrated circuit and dc-dc converter

Номер: US20130141060A1
Автор: Yoichi Tokai
Принадлежит: Toshiba Corp

A DC-DC converter includes a smoothing capacitor connected between a first output terminal connected to a first end of a load and a second output terminal connected to a second end of the load, the smoothing capacitor smoothing an output voltage. The DC-DC converter includes a choke coil having a first end connected to a first end of a battery. The DC-DC converter includes a semiconductor integrated circuit having a switch terminal connected to a second end of the choke coil, a first potential terminal connected to the first output terminal, and a second potential terminal connected to the second output terminal and a second end of the battery.

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Номер записи: 43
20-06-2013 дата публикации

Power-factor-corrected resonant converter and parallel power-factor-corrected resonant converter

Номер: US20130154372A1
Автор: Han-Hsiang Huang, Lon-Kou Chang, Yi-Wen Huang
Принадлежит: Macroblock Inc

A resonant converter with power factor correction includes a power-obtaining circuit, an energy-storage element and an energy-transferred circuit. The power-obtaining circuit is used for receiving an input line voltage. The energy-storage element is coupled between the power-obtaining circuit and the energy-transferred circuit. The energy-transferred circuit is used for generating an output power. In a first time period, based on a first control signal, the energy-storage element and the power-obtaining circuit operate a soft switching so that the energy-storage element is charged to obtain the input line power and generate an energy-storage voltage. In a second time period, based on a second control signal, the energy-storage element and the energy-transferred circuit operate a soft switching so that the energy-storage element is discharged to make the energy-storage voltage converted into the output power.

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Номер записи: 44
20-06-2013 дата публикации

Pulse Width Modulation Controller Architectures

Номер: US20130154602A1
Автор: Karl Jean-Paul Courtel
Принадлежит: Atmel Nantes SA

Systems, apparatuses, and techniques for pulse width modulation (PWM) are described. A described system includes a circuit that contains an inductor and a transistor that controls current through the inductor based on a PWM signal to produce an output; and a controller to provide the PWM signal, which includes PWM cycles that include on-durations and off-durations. The controller can receive a first signal indicating an input voltage that is applied to the inductor, receive a second signal indicating a current through the inductor, use an on-duration parameter value to control the on-duration, determine a maximum off-duration of the off-durations corresponding to the PWM cycles occurring within a first voltage cycle, the first voltage cycle being defined between two consecutive zero-crossing events as indicated by the first signal, and adjust the on-duration parameter value for a second, subsequent voltage cycle based on the maximum off-duration to regulate the output voltage.

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Номер записи: 45
27-06-2013 дата публикации

Power module and distributed power supply apparatus having the same

Номер: US20130163288A1
Автор: Chong Eun Kim, Don Sik KIM, Dong Jin Park, Duk You KIM, Gun Woo Moon, Jong Woo Kim
Принадлежит: Samsung Electro Mechanics Co Ltd

There are a power module and a distributed power supply apparatus having the same. The power module includes: a power factor correction stage switching input power to correct a power factor thereof; a DC/DC conversion stage switching the power of which the power factor has been corrected by the power factor correction stage to convert the power into preset DC power; a control unit controlling the power factor correction stage and the DC/DC conversion stage to perform a power conversion operation in a preset powered mode and stopping the power conversion operation of the DC/DC conversion stage in a preset idle mode; and a reference voltage supply unit supplying a preset reference voltage to the DC/DC conversion stage in the idle mode.

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Номер записи: 46
27-06-2013 дата публикации

BOOST POWER FACTOR CORRECTION CONTROLLER

Номер: US20130163300A1
Автор: Yao Jie, Zhao Chen
Принадлежит: SILERGY SEMICONDUCTOR TECHNOLOGY (HANGZHOU) LTD

The present invention relates to a power factor correction (PFC) controller. In one embodiment, a boost PFC controller configured in an AC/DC converter can include: (i) a conductive signal generator configured to receive a first sampling signal, and to generate a conductive signal according to the first sampling signal and a first control signal; (ii) a shutdown signal generator configured to compare a second control signal against a third control signal, and to generate a shutdown signal when the second control signal reaches a level of the third control signal; and (iii) a logic controller coupled to the conductive signal generator and the shutdown signal generator to control a switching state of a power switch in AC/DC converter. 1. A power factor correction (PFC) controller configured for an AC/DC converter , the PFC controller comprising:a) a conductive signal generator configured to receive a first sampling signal that represents an inductor current, wherein said first sampling signal is configured to be compared against a first control signal, wherein said first control signal is in proportion to and rises during a shutdown time of a power switch of said AC/DC converter, wherein when said first control signal reaches a level of said first sampling signal, said conductive signal generator is configured to output a conductive signal;b) a shutdown signal generator configured to compare a second control signal against a third control signal, wherein said second control signal is in proportion to and rises during a conductive time of said power switch with a first proportionality coefficient, wherein said third control signal is in proportion to a duty cycle of said power switch with a second proportionality coefficient, wherein when said second control signal reaches a level of said third control signal, said shutdown signal generator is configured to output a shutdown signal; andc) a logic controller coupled to said conductive signal generator and said shutdown ...

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Номер записи: 47
25-07-2013 дата публикации

Capacitor discharging circuit and converter

Номер: US20130188401A1
Автор: BAOCHEN Wang, Hongjian Gan, Hongyuan Jin, Jianping Ying
Принадлежит: Delta Electronics Shanghai Co Ltd

A capacitor discharging circuit and a converter are disclosed. The converter comprises: a capacitor connected between the live line and null line of an AC power input terminals, a conversion module coupled to the capacitor and comprising an energy storage component at least, an energy transfer unit coupled with the energy storage component and the capacitor, an AC power-off detecting unit and a control unit; wherein the energy transfer unit comprises a switch device; when AC power is disconnected, the AC power-off signal triggers the control unit to output a switch driving signal, controlling the operation of the energy transfer unit to transfer the energy stored in the capacitor to the energy storage component to discharge the capacitor.

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Номер записи: 48
22-08-2013 дата публикации

Power module and air conditioner

Номер: US20130214746A1
Автор: Masahiro Kato
Принадлежит: Mitsubishi Electric Corp

A power module is a power module having a PFC (power factor correction) function. The power module includes: IGBTs in a pair; first diodes in a pair connected to the IGBTs in a pair, the first diodes forming a reverse-conducting element; and second diodes in a pair connected to the IGBTs in a pair, the second diodes having a rectifying function. The power module further includes a driving IC that drives the IGBTs in a pair, and P terminals in a pair provided independently of each other. The P terminals are connected to one ends of the first diodes in a pair, respectively, the one ends being opposite to the other ends of the first diodes to which the IGBTs in a pair are connected.

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Номер записи: 49
22-08-2013 дата публикации

Primary-side regulated modulation controller with improved transient response and audile noise

Номер: US20130215649A1
Автор: Matthew Man Ho Ku, Yuquan HUANG
Принадлежит: Fremont Micro Devices Shenzhen Ltd

A switching mode power supply, and a primary-side controlled PFM converter using the primary-side regulated PFM controller are discussed. In present embodiment, the primary side cycle by cycle switch peak current is no longer a constant. The time detector is added to monitor the waveform of primary-side sample voltage and then generate the duty cycle. The transfer function should be selected to satisfy a specific relationship of switching frequency and switch peak current against with output loading current. The new design shows higher switching frequency but lower value of switch peak current at light load condition. This resolves the audible noise and poor transient response issue from the prior art PFM controller.

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Номер записи: 50
29-08-2013 дата публикации

Power factor correction device and correcting method thereof

Номер: US20130221936A1
Автор: Chung-Ping Ku, Wei-Chi Huang
Принадлежит: Alpha and Omega Semiconductor Cayman Ltd

A power factor correction device comprises a power stage circuit converting input alternating current voltage into input current according to a pulse width modulation signal and outputs the input current to a load generating output voltage on the load, and sampling the input current outputting a correcting current; a current compensating circuit receiving and comparing the correcting current with a reference current signal generating a compensating current signal; a voltage compensating circuit receiving and comparing the output voltage with a reference voltage generating a compensating voltage signal; a multiplication amplifier receiving the compensating current signal and the compensating voltage signal generating an updated reference current signal by multiplying the compensating current signal with the compensating voltage signal; and a pulse width modulation converter receiving the compensating current signal and the compensating voltage signal generating the pulse width modulation signal to synchronize phase of alternating current voltage and input current.

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Номер записи: 51
29-08-2013 дата публикации

Small size power supply

Номер: US20130223109A1
Автор: Dongbing Wang
Принадлежит: Moxtek Inc

An electrical circuit as part of a reduced size power supply with improved use of electrical power can include an isolation circuit between an LC switching circuit and a load, a parallel LC energy storage circuit, and/or a dual LC switching circuit.

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Номер записи: 52
29-08-2013 дата публикации

BOOST PFC CONTROLLER

Номер: US20130223119A1
Автор: Yao Jie, Zhao Chen
Принадлежит: SILERGY SEMICONDUCTOR TECHNOLOGY (HANGZHOU) LTD

The present invention pertains to a boost power factor correction (PFC) controller. In one embodiment, a boost PFC controller for an AC/DC converter can include: an off signal generator that compares an inductor current sample signal against a first control signal, where the inductor current sample signal increases during an on time of a power switch of the AC/DC converter, and the off signal generator generates an off signal when the inductor current sample signal reaches the first control signal level; and an on signal generator that compares a second control signal against a third control signal, where the second control signal increases during the off time of the power switch, and the on signal generator generates an on signal when the second control signal reaches the third control signal level. 1. A boost power factor correction (PFC) controller configured for an AC/DC converter , the boost PFC controller comprising:a) an off signal generator configured to compare an inductor current sample signal against a first control signal, wherein said inductor current sample signal increases during an on time of a power switch of said AC/DC converter, and wherein said off signal generator is configured to generate an off signal when said inductor current sample signal reaches a level of said first control signal;b) an on signal generator configured to compare a second control signal having a first coefficient of proportionality to an off time of said power switch against a third control signal having a second coefficient of proportionality to an off duty cycle of said power switch, wherein said second control signal increases during said off time of said power switch, and wherein said on signal generator is configured to generate an on signal when said second control signal reaches a level of said third control signal; andc) a logic circuit coupled to said on signal generator and said off signal generator, wherein said logic circuit is configured to turn on said power ...

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Номер записи: 53
05-09-2013 дата публикации

Multichannel dc-dc converter

Номер: US20130229167A1
Автор: Tomoyoshi Hiei
Принадлежит: Murata Manufacturing Co Ltd

In a multichannel DC-DC converter that reduces radiation noise to a minimum, a wiring line between the coil conductor of a channel having the smallest load current and the switching IC, among the coil conductors defining a plurality of channels, is the longest connection wiring line, such that a channel having the smallest load current is connected to a wiring line that is most likely to radiate noise and radiation noise is reduced to a minimum. A connection wiring line connected to a coil conductor having the largest load current among the plurality of coil conductors is the shortest connection wiring line. A channel having the largest load current is connected to a wiring line that is least likely to radiate noise and, as a result, radiation noise is further reduced.

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Номер записи: 54
12-09-2013 дата публикации

ZERO VOLTAGE SWITCHING INTERLEAVED BOOST AC/DC CONVERTER

Номер: US20130235631A1
Автор: Jain Praveen, Pahlevaninezhad Majid
Принадлежит:

Circuits and methods relating to the provision of a reactive current to ensure zero voltage switching in a boost power factor correction converter. A simple passive circuit using a series connected inductor and capacitor are coupled between two phases of an interleaved boost PFC converter. The passive circuit takes advantage of the 180° phase-shift between the two phases to provide reactive current for zero voltage switching. A control system for adjusting and controlling the reactive current to ensure ZVS for different loads and line voltages is also provided. 2. A circuit according to wherein each power transistor is equipped with a snubber diode.3. A circuit according to wherein each power transistor is equipped with a capacitor coupled between each transistor's drain and source leads.4. A circuit according to wherein each power transistor is a metal-oxide-semiconductor field effect transistor (MOSFET).5. A circuit according to wherein said full bridge diode rectifier subcircuit receives an AC input current.6. A circuit according to further including an output capacitor coupled between said positive output node and said negative power node.7. A circuit according to wherein a frequency of switching of said power transistors is adjusted based on a load to said circuit.8. A circuit according to wherein signals produced by said first and second power transistors are 180 degrees out of phase from signals produced by said third and fourth power transistors.9. A circuit according to wherein a frequency of switching of said power transistors is adjusted when a duty cycle for said circuit is lower than 0.5.11. A circuit according to wherein each boost converter subcircuit comprises:a boost inductor;a first boost power transistor; anda second boost power transistor.12. A circuit according to wherein each end of said passive auxiliary subcircuit is coupled to a node between said first and second boost power transistor in one of said boost converter subcircuits.13. A circuit ...

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Номер записи: 55
26-09-2013 дата публикации

Driver Circuit And Driving Method

Номер: US20130249462A1
Автор: Heinrich Steinhart, Mark Heilig, Martin Beichter, Ulf Rinckleb
Принадлежит: C&E Fein GmbH and Co

A driver circuit for driving an electrical load includes an input terminal pole connecting the driver circuit to an AC voltage source, an output terminal pole connecting the driver circuit to the load, a rectifier circuit connected to the input terminal pole for converting an AC voltage into a pulsating DC voltage, and a control element connected to the rectifier circuit and to the output terminal pole. The control element has a switch and a controller, the controller switching the switch on and off by means of a pulse train signal, wherein an electrical output value of the driver circuit is adjustable by switching the switch. The controller is configured to vary at least one time-based value of the pulse train signal within one period of the pulsating DC voltage such that a driver current is adjusted at the output terminal pole having a defined waveform within the period.

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Номер записи: 56
26-09-2013 дата публикации

Dc to dc converter with pseudo constant switching frequency

Номер: US20130249516A1
Автор: Shinobu Aoki, Tetsuo Tateishi
Принадлежит: TEXAS INSTRUMENTS INCORPORATED

A method for a DC to DC converter with a pseudo constant switching frequency is disclosed herein. For example, some embodiments provide a DC to DC converter having a switch connected to a switching node to control a voltage of the switching node, and a switching controller that is adapted to turn on and off the switch at a substantially constant frequency based at least in part on the voltage of the switching node. The switching controller includes a modulator connected to a control electrode of the switch and that is adapted to actuate and deactuate the switch, and a first timer that is connected to the switching node and to the modulator. The first timer uses the voltage of the switching node to determine an on-time for the switch.

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Номер записи: 57
10-10-2013 дата публикации

Method of Preventing Spurious Ringing During Discontinuous Conduction Mode in Inductive Boost Converters for White LED Drivers

Номер: US20130264953A1
Автор: Pier Cavallini
Принадлежит: Dialog Semiconductor GmbH

Circuits and methods to prevent ringing of white LED drivers by adding a high voltage coil switch circuit, a high voltage edge detector circuit, and a boot strap circuit are disclosed. The coil switch circuit to short the coil of a boost converter when the current in it reaches zero during DCM, comprises a series of 2 identical HV enhancement NMOS with bulk switch system. The Edge Detector circuit senses the fast falling edge of the LX node. The Boost Strap circuit lifts the gate of coil switch circuit above the battery voltage level and turns on the coil switch. a Boost Strap (BS) system to lift the gate of CS above the VBAT level and turn on CS

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Номер записи: 58
31-10-2013 дата публикации

Power supplying apparatus and power charging apparatus

Номер: US20130285621A1
Автор: Bu Won Lee, Won Jin Cho, Young Jin Cho
Принадлежит: Samsung Electro Mechanics Co Ltd

There are provided a power supplying apparatus controlling voltage of a power factor correcting circuit according to a power state and a power charging apparatus controlling voltage of a power factor correcting circuit according to a charging state of a battery. The power supplying apparatus includes: a power factor correcting circuit switching input power to correct a power factor thereof and adjusting a voltage level of the power of which the power factor has been corrected according to a state of power transferred to a load; and a resonant DC to DC converting circuit having a resonance frequency varied according to a voltage level of DC power from the power factor correcting circuit and converting the DC power from the power factor correcting circuit into supply power having a preset level according to the resonance frequency.

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Номер записи: 59
31-10-2013 дата публикации

Power supply device

Номер: US20130286690A1
Автор: Toshiro Ijichi
Принадлежит: Olympus Corp

A power supply device includes a first converter which converts an input voltage to a first voltage, a second converter which converts the first voltage from the first converter to a second voltage, a voltage comparison section which compares the first voltage outputted from the first converter with a predetermined reference voltage, a voltage comparison result output section which outputs a first signal until the first voltage is determined to be higher than the predetermined reference voltage by the voltage comparison section and retains a second signal as an output after the first voltage is determined to be higher than the predetermined reference voltage, and a converter control section which controls the second converter to stop when the first signal is outputted from the voltage comparison result output section and controls the second converter to operate when the second signal is outputted from the voltage comparison result output section.

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Номер записи: 60
14-11-2013 дата публикации

Control circuits and control methods for flyback converters and ac-dc power converters thereof

Номер: US20130301309A1
Автор: Wei Chen
Принадлежит: Hangzhou Silergy Semiconductor Technology LTD

The present invention relates to control circuits and methods for a flyback converter and AC-DC power converters thereof. In one embodiment, a control circuit can include: (i) a turn-on signal generating circuit that is configured, in each switching cycle, to receive a drain-source voltage of a power switch of the flyback converter, and to activate a turn-on signal to turn on the power switch when the drain-source voltage reaches a valley value; (ii) a turn-off signal generating circuit that is configured, in each switching cycle, to activate a turn-off signal to turn off the power switch based on a power switch feedback error signal after a power switch conducting time interval has elapsed; and (iii) where input current and voltages of the flyback converter can be maintained as substantially in phase, and an output electrical signal of the flyback converter can be maintained as substantially constant.

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Номер записи: 61
21-11-2013 дата публикации

Power Converter Circuit

Номер: US20130307467A1
Автор: Andrea Carletti
Принадлежит: INFINEON TECHNOLOGIES AG

A power converter circuit includes input terminals configured to receive an input voltage and an input current and output terminals configured to provide an output voltage and an output current. A boost converter stage is coupled between the input terminals and the output terminals. The power converter circuit is operable to operate in one of a first operation mode, a second operation mode, and a third operation mode dependent on the output voltage. The first, second and third operation modes are mutually different. In each of the first, second and third operation modes, the input current is controlled dependent on the input voltage.

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Номер записи: 62
28-11-2013 дата публикации

Switch control device, power supply device comprising the same, and driving method of power supply device

Номер: US20130314961A1
Автор: Hyun-Chul EOM, Seung-Uk YANG
Принадлежит: Fairchild Korea Semiconductor Ltd

The present invention relates to a switch controller, a power supply including the same, and a driving method thereof. An AC input of the power supply is connected to a rectification circuit. The power supply includes a power switch to which the AC input passed through the rectification circuit flows during a turn-on period of the power switch and a switch controller detecting a half-on time point that is an intermediate time point of the turn-on period, calculating the AC current using a result of sampling a sense voltage that depends on a current flowing to the power switch during the turn-on period at the half-on time point and the turn-on period, and controlling the input current to have a reference sine wave. The reference sine wave has a sine wave that is full-wave rectified from the AC input.

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Номер записи: 63
05-12-2013 дата публикации

INTEGRATED ON-TIME EXTENSION FOR NON-DISSIPATIVE BLEEDING IN A POWER SUPPLY

Номер: US20130320882A1
Автор: Gaknoki Yury, Mao Mingming, Pastore Tiziano
Принадлежит: POWER INTEGRATIONS, INC.

An example controller for a switched mode power supply includes a zero crossing detector, drive logic, and a logic gate. The zero-crossing detector generates a zero-crossing signal indicating a zero-crossing condition in the power supply. The drive logic generates a drive logic output signal in response to the zero-crossing signal and in response to a feedback signal, where the drive logic output signal is representative of an on-time of a switch to regulate an output of the power supply. The logic gate is coupled to receive a first signal representative of a current through the switch and a second signal representative of a zero-crossing time threshold. The logic gate is further coupled to extend the on-time of the switch until current through the switch reaches a zero-crossing current threshold or until the on-time of the switch reaches the zero-crossing time threshold. 1. A controller for a switched mode power supply , the controller comprising:a zero-crossing detector coupled to generate a zero-crossing signal that indicates a zero-crossing condition in the power supply;drive logic coupled to the zero-crossing detector to generate a drive logic output signal in response to the zero-crossing signal and in response to a feeback signal representative of an output of the power supply, wherein the drive logic output signal is representative of an on-time of a switch to regulate the output of the power supply; anda logic gate coupled to receive a first signal representative of a current through the switch and a second signal representative of a zero-crossing time threshold, wherein the logic gate is further coupled to extend the on-time of the switch until the current through the switch reaches a zero-crossing current threshold or until the on-time of the switch reaches the zero-crossing time threshold.2. The controller of claim 1 , wherein the logic gate comprises an OR gate.3. The controller of claim 1 , further comprising a latch coupled to generate a drive signal ...

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Номер записи: 64
05-12-2013 дата публикации

POWER SUPPLY WITH INTERFERENCE SUPPRESSION, AND METHOD FOR OPERATING A POWER SUPPLY

Номер: US20130322124A1
Автор: Minkkinen Jarmo, Suorsa Ilkka
Принадлежит: SALCOMP OYJ

A switched-mode power supply comprises a transformer with a primary winding and a secondary winding. A switch is coupled in series with the primary winding and configured to repeatedly interrupt a current through the primary winding. An inductor is located differently with reference to magnetic fields that the primary and secondary windings are configured to induce. A connection exists between the inductor and a circuit that contains one of the primary and secondary windings. The connection is configured to connect from the inductor to the circuit a first voltage that has a waveform representative of and a polarity opposite to a second voltage induced in the switched-mode power supply by leakage flux of the transformer at a switching moment of the switch. 2. A switched-mode power supply according to claim 1 , wherein said inductor is coupled with said switch.3. A switched-mode power supply according to claim 1 , wherein the switched-mode power supply comprises a series coupling of an auxiliary winding and a capacitor claim 1 , said series coupling being coupled in parallel with said inductor.4. A switched-mode power supply according to claim 2 , wherein:the switched-mode, power supply comprises a second inductor coupled in series with said primary winding, said switch, and said inductor, andin the series coupling of said second inductor, said primary winding, said switch, and said inductor, said second inductor is located on the other side of said primary winding and said switch than said inductor.5. A switched-mode power supply according to claim 4 , wherein:the switched-mode power supply comprises a first capacitor coupled in parallel with the series coupling of said second inductor, said primary winding, said switch, and said inductor, andthe switched-mode power supply comprises a second capacitor coupled in parallel with a series coupling of said primary winding and said switch but not said inductor or said second inductor.6. A switched-mode power supply ...

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Номер записи: 65
12-12-2013 дата публикации

Voltage rectifier

Номер: US20130329473A1
Автор: Yong-Xin Ren
Принадлежит: Hon Hai Precision Industry Co Ltd, Hongfujin Precision Industry Shenzhen Co Ltd

A voltage rectifier rectifies an alternating current voltage to a direct current voltage. The voltage rectifier includes an input port for receiving the alternating current voltage; an output port for outputting the direct current voltage; a lightning protection unit; a rectifying unit; a filtering unit; a first fuse; and a second fuse. The input port, the lightning protection unit, the rectifying unit, the filtering unit, the output port are connected in series. The first fuse is connected between the input port and the lightning protection unit; the second fuse is connected between the lightning protection unit and the rectifying unit or the second fuse is connected between the rectifying unit and the filtering unit.

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Номер записи: 66
19-12-2013 дата публикации

AC/DC Power Conversion Methods and Apparatus

Номер: US20130336031A1
Автор: JR. Earl W., McCune
Принадлежит:

An AC/DC power conversion apparatus comprises an AC/DC converter for converting AC power to DC power for a load and a controller that maintains a power factor of the load as the load varies. The AC/DC converter includes an inductor and a plurality of switches that alternately connects and disconnects the inductor to and from an AC power source, to generate the DC power for the load. The plurality of switches is controlled by a plurality of switch drive signals generated by the controller, based on comparisons of an AC voltage from the AC power source to a DC output voltage produced by the AC/DC converter. To maintain the power factor of the load, the controller is configured to adjust the frequency of the plurality of switch drive signals in response to variations in the load while holding the duty cycles of the switch drive signals constant. 1. An AC/DC power conversion apparatus , comprising:an AC/DC converter having a plurality of switches configured to convert power from an AC power source to DC power for powering a variable load; anda controller configured to generate a plurality of switch drive signals that control switching of said plurality of switches and maintain a power factor of said load by adjusting a frequency of said plurality of switch drive signals in response to variations in the load.2. The AC/DC power conversion apparatus of claim 1 , wherein said controller is configured to hold duty cycles of said switch drive signals constant while adjusting said frequency.3. The AC/DC power conversion apparatus of claim 1 , wherein said controller includes a comparison circuit configured to compare an AC voltage from said AC power source to a DC voltage produced by said AC/DC converter claim 1 , and said AC/DC converter is configured to produce said DC voltage based on comparisons made by said comparison circuit.4. The AC/DC power conversion apparatus of claim 3 , wherein said AC/DC converter has an input configured to receive said AC voltage; an inductor; ...

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Номер записи: 67
26-12-2013 дата публикации

Power converting device, motor driving device, and refrigerating and air-conditioning apparatus

Номер: US20130342139A1
Автор: Koichi Arisawa, Takashi Yamakawa, Takuya Shimomugi, Yosuke Shinomoto
Принадлежит: Mitsubishi Electric Corp

A power converting device includes a rectifying circuit that rectifies voltage of an alternating-current power supply; smoothing means that smoothes output voltage from the rectifying circuit; short-circuiting means that is disposed more closely to the alternating-current power supply than the smoothing means and that short-circuits the alternating-current power supply and controls at least one of electric current and voltage; a reactor that is disposed more closely to the alternating-current power supply than the short-circuiting means; one or more backflow preventing elements that prevent electric current from flowing backward from a load side toward the alternating-current power supply; commutating means for performing a commutation operation for causing electric current to flow toward a different path that is connected in parallel with the one or more backflow preventing elements; malfunction detecting means for detecting a malfunction of the commutating means; and switching control means that performs operation control of the commutating means in accordance with detection by the malfunction detecting means.

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Номер записи: 68
26-12-2013 дата публикации

ADJUSTABLE FLY-BACK OR BUCK-BOOST CONVERTER

Номер: US20130343100A1
Автор: Dijkman Willibrordus Jurrianus
Принадлежит: KONINKLIJKE PHILIPS N.V.

In fly-back and buck-boost converters (), to reduce distortions and to increase distortion power factors, arrangements () are introduced for adjusting control signals generated by controllers () for controlling switches () of the converters. The arrangements (), in response to increased/decreased amplitudes of voltage signals from voltage supplies () for feeding the converters, increase/decrease durations of conducting times of the switches (). This way, unwanted losses in the grid and power generators are avoided. The converters are relatively low cost single stage converters. Preferably, the durations are substantially proportional to sums of the amplitudes of the voltage signals and design parameters. These design parameters may comprise amplitudes of other voltage signals such as output voltages. Arrangements () are provided for controllers () that can only produce fixed durations as well as for controllers () that can produce adaptable durations via adaptable external elements. 1. A controller for controlling a switch of a converter , the converter configured for connection to a voltage supply , the controller configured to:receive a voltage signal of the voltage supply; andgenerate a control signal such that a duration of conducting time of the switch of the converter is longer at a higher instantaneous amplitude of the voltage signal and that the duration of the conducting time of the switch is shorter at a lower instantaneous amplitude of the voltage signal,wherein the control signal is such that the duration of the conducting time of the switch is substantially proportional to a sum of the amplitude of the voltage signal and a design parameter.2. The controller as defined in claim 1 , wherein the design parameter comprises an amplitude of another voltage signal claim 1 , wherein the converter comprises a fly-back converter claim 1 , the fly-back converter comprising a transformer with a primary coil coupled to the switch and with a secondary coil to be ...

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Номер записи: 69
02-01-2014 дата публикации

Light emitting diode driving apparatus

Номер: US20140001973A1
Автор: Chang Seok Lee, Deuk Hee Park, Sang Hyun Cha, Yun Joong Lee
Принадлежит: Samsung Electro Mechanics Co Ltd

There is provided a light emitting diode driving apparatus for controlling the light emitting diode driving according to a feedback signal input through a positive feedback loop, the light emitting diode driving apparatus including: a power converting unit switching input power and supplying driving power to at least one light emitting diode; a feedback unit detecting and feeding back a voltage of the driving power of the power converting unit; and a controlling unit including a comparator having a negative terminal receiving a reference voltage having a set voltage level and a positive terminal receiving the detected voltage from the feedback unit and comparing the reference voltage with the detected voltage to control a switching of the power converting unit according to a comparison result.

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Номер записи: 70
02-01-2014 дата публикации

Bridgeless Power Factor Correction Circuit and Control Method Thereof

Номер: US20140002033A1
Автор: CHEN Wenbin, Dai Shengyong, Huang Boning
Принадлежит: Huawei Technologies Co., Ltd.

A bridgeless power factor correction (PFC) circuit, which includes an alternating current power supply module, a power module, and a control module; the power module includes one or more interleaved PFC circuits, each interleaved PFC circuit includes one inductor, one pair of first switching components, and at least one capacitor, a first end of the inductor is connected to the alternating current power supply module, and a second end of the inductor is connected to one end of each capacitor through one of the first switching components and is also connected to the other end of each capacitor through the other one of the first switching components; and the control module samples a current of each first switching component in the power module, and turns off a first switching component through which a negative current flows. 1. A bridgeless power factor correction (PFC) circuit , comprising:an alternating current power supply module;a power module; anda control module,wherein the alternating current power supply module is connected to the power module to provide electrical energy for the power module,wherein the power module comprises one or more interleaved PFC circuits,wherein each interleaved PFC circuit comprises one inductor, one pair of first switching components, and at least one capacitor,wherein a first end of the inductor is connected to the alternating current power supply module,wherein a second end of the inductor is connected to one end of each capacitor through one of the first switching components and is also connected to the other end of each capacitor through the other one of the first switching components, andwherein the control module samples a current flowing through each first switching component in the power module and turns off a first switching component through which a negative current flows.2. The circuit according to claim 1 , wherein the at least one capacitor comprises a plurality of capacitors connected in parallel.3. The circuit ...

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Номер записи: 71
02-01-2014 дата публикации

POWER FACTOR CORRECTION CIRCUIT, THE CONTROL CIRCUIT AND THE METHOD THEREOF

Номер: US20140003105A1
Автор: DING LIANFENG, Li ZhengXing, Lin Sicong
Принадлежит:

A power factor correction circuit including a rectifier bridge, an energy storage component, a power switch, a second switch and a control circuit provides reduced THD and improved PF performance under a high input AC voltage. 1. A control circuit for a power factor correction circuit , the power factor correction circuit comprising at least a power switch controlled by the control circuit to be ON and OFF to provide a regulated signal based on an input AC voltage , the control circuit comprising:a peak value sample-hold unit configured to receive a line voltage sense signal indicative of the input AC voltage, and to generate a peak value detecting signal;a clamp unit coupled to the peak value sample-hold unit to receive the peak value detecting signal, and to generate a clamp signal;a selecting unit having a first input terminal coupled to the clamp unit to receive the clamp signal, a second input terminal configured to receive the line voltage sense signal, and an output terminal generating a peak current reference signal by selecting the signal with the lower voltage between the clamp signal and the line voltage sense signal;a current comparator having a first input terminal coupled to the output terminal of the selecting unit to receive the peak current reference signal, a second input terminal configured to receive a current sense signal indicative of a current flowing through the power switch, and an output terminal generating a current comparison signal based on the peak current reference signal and the current sense signal; anda controller having a first input terminal coupled to the output terminal of the current comparator to receive the current comparison signal, a second input terminal configured to receive a feedback signal indicative of the regulated voltage, and an output terminal generating a control signal to control the ON and OFF of the power switch.2. The control circuit of claim 1 , wherein the peak value sample-hold unit comprises:an ...

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Номер записи: 72
02-01-2014 дата публикации

Boost converter

Номер: US20140003106A1
Автор: Hiroshi Taki, Jun Ishii, Kazuhiro Shirakawa
Принадлежит: Denso Corp

A boost converter capable of reducing a common-mode current that flows to the outside of a casing. In the converter, a boost circuit includes first and second inductors and at least one switching element electrically connected therebetween. A controller turns on and off the at least one switching element to boost an input voltage of the boost circuit. A first floating capacitor is formed between a first electrical path, which is at the same potential as a junction between the at least one switching element and the first inductor, and a mounting member coupled to a reference potential member with an insulator therebetween. A second floating capacitor is formed between a second electrical path, which is at the same potential as a junction between the at least one switching element and the second inductor, and the mounting member.

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Номер записи: 73
09-01-2014 дата публикации

Controller for a Power Converter and Method of Operating the Same

Номер: US20140009978A1
Автор: Antony Brinlee, Sriram Chandrasekaran, Steven Malechek
Принадлежит: Power Systems Technologies Ltd

A controller for a power converter and method of operating the same. In one embodiment, the controller includes an inductor-inductor-capacitor (“LLC”) controller configured to receive an error signal from an error amplifier to control a switching frequency of an LLC stage of the power converter to regulate an output voltage thereof. The controller also includes a power factor correction (“PFC”) controller configured to control a bus voltage produced by a PFC stage of the power converter and provided to the LLC stage so that an average switching frequency thereof is substantially maintained at a desired switching frequency.

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Номер записи: 74
16-01-2014 дата публикации

Switching power supply device

Номер: US20140016364A1
Автор: Jian Chen
Принадлежит: Fuji Electric Co Ltd

In some aspects of the invention, a load state detecting circuit is configured so that a threshold voltage for determining the size of a load of a DC-DC converter is set in the load state detecting circuit based on a maximum value of an output voltage of a power factor correction converter in an operation-stopped state of the power factor correction converter, so that the load state detecting circuit outputs an operation-enable signal when a feedback voltage indicating the size of the load of the DC-DC converter exceeds the threshold voltage. Thus, by way of some aspects of the invention, it is possible to provide a switching power supply device which can control enabling and stopping operation of a power factor correction converter reliably in accordance with a load state of a DC-DC converter obtaining a predetermined DC output voltage by switching an output voltage of the correction converter.

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Номер записи: 75
16-01-2014 дата публикации

Magnetic Device and Power Converter Employing the Same

Номер: US20140016370A1
Автор: Sriram Chandrasekaran
Принадлежит: Power Systems Technologies Ltd

A magnetic device and power converter employing the same. In one embodiment, the magnetic device includes a first L-core segment including a first leg and a second leg extending therefrom, and an opposing second L-core segment including a first leg and a second leg extending therefrom. The magnetic device also includes a winding formed around at least one of the first leg and the second leg of the first L-core segment or the second L-core segment.

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Номер записи: 76
16-01-2014 дата публикации

Method and apparatus to control a power converter having a low loop bandwidth

Номер: US20140016377A1
Автор: David Michael Hugh Matthews, Mingming Mao, Tiziano Pastore, Yury Gaknoki
Принадлежит: Power Integrations Inc

A controller for use in a power converter includes a comparator coupled to receive a signal representative of an output of the power converter. A counter is coupled to an output of the comparator to sample the output of the comparator a plurality of times within a period. A state machine is coupled to an output of the counter to control switching of the power converter according to one of a plurality of operating condition states in response to the output of the counter. The state machine is coupled to be updated at an end of the period.

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Номер записи: 77
23-01-2014 дата публикации

Method for controlling output waveforms of an uninterruptible power supply

Номер: US20140021790A1
Автор: Jian Wang
Принадлежит: Cyber Power Systems Inc

A method for controlling output waveforms of an uninterruptible power supply (UPS) provides multiple types of output waveforms through a UPS for users to selectively switch to a waveform of output power after the UPS enters a battery mode. The output waveforms include square wave and sinusoidal wave. Based on load characteristics, users can choose either square wave or sinusoidal wave as the waveform of the output power. Accordingly, single UPS can meet the demand of high efficiency and longer discharge time or better output characteristics and low noise according to different load conditions.

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Номер записи: 78
23-01-2014 дата публикации

SERIES SWITCH BRIDGELESS POWER SUPPLY

Номер: US20140022828A1
Автор: Metzler Crispin
Принадлежит: POLAR SEMICONDUCTOR, INC.

A series-switch bridgeless power supply provides common-mode EMI filtering. The power supply includes a center-tapped inductive device bifurcated into first and second windings. The AC input, provided at first and second input terminals, is applied to the center-tap of the inductive device. First and second switches are connected to distal ends of the first and second windings, respectively, and are connected in series with one another to form a circuit path from the first input terminal, through the inductive device and each of the series-connected switches, back through the inductive device and to the second input terminal. A controller turns the switches On and Off to modulate the current through the inductive device. Common-mode voltage generated by the modulation of the first and second switches is filtered by connection of each switch to a junction defined between a pair of capacitors connected in series between the first and second input terminal. The topology provides a first stage, two-pole filter for filtering common-mode voltages. 1. A series-switch bridgeless power supply comprising:first and second terminals for receiving an alternating current (AC) input;a first and second capacitor connected in series with one another between the first and second terminals, a first junction being defined between the first and second capacitor;a center-tapped inductive device bifurcated into a first winding and a second winding, the first winding having a first end and a second end, the first end connected to the first terminal at a first center-tap position of the inductive device, the second winding having a first end and a second end, the first end connected to the second terminal at a second center-tap position of the inductive device;a third capacitor connected between the first and second center-tap positions of the inductive device;a first switch having a control terminal and first and second controlled terminals, the first controlled terminal electrically ...

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Номер записи: 79
13-02-2014 дата публикации

PFC SIGNAL GENERATION CIRCUIT, PFC CONTROL SYSTEM USING THE SAME, AND PFC CONTROL METHOD

Номер: US20140042992A1
Автор: Takata Yasuhiro
Принадлежит: RENESAS ELECTRONICS CORPORATION

A PFC signal generation circuit which generates a PFC signal to control a PFC circuit including a first inductor connected to a first switch and a second inductor connected to a second switch includes: a first control signal output circuit that outputs a first PFC signal to turn on the first switch at a zero current detection timing of the first inductor; a timing adjustment circuit that generates a control signal to turn on the second switch after waiting until a target timing, when a zero current detection timing of the second inductor is earlier than the target timing, and to turn on the second switch at a target timing in a subsequent cycle, when it is later than an allowable period from the target timing; and a second control signal output circuit that generates a second PFC signal to turn on the second switch according to a control signal. 1. A PFC signal generation circuit that generates a PFC signal to control a PFC circuit including a first inductor connected to a first switch and a second inductor connected to a second switch , the PFC signal generation circuit comprising:a first control signal output circuit that outputs a first PFC signal to turn on the first switch at a zero current detection timing of the first inductor;a timing adjustment circuit that generates a control signal to turn on the second switch after waiting until a target timing, when a zero current detection timing of the second inductor is earlier than the target timing, and to turn on the second switch at a target timing in a subsequent cycle, when the zero current detection timing of the second inductor is later than an allowable period from the target timing; anda second control signal output circuit that generates a second PFC signal to turn on the second switch, according to the control signal.2. The PFC signal generation circuit according to claim 1 , further comprising a counter having a count value cleared at the zero current detection timing of the first inductor.3. The PFC ...

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Номер записи: 80
13-02-2014 дата публикации

Three phase boost converter to achieve unity power factor and low input current harmonics for use with ac to dc rectifiers

Номер: US20140043870A1
Автор: Mahesh M. Swamy
Принадлежит: Yaskawa America Inc

A voltage source inverter comprises a zigzag transformer providing a neutral point. A rectifier unit comprises three single phase boost converters each connected to one of the three phases of AC power and the neutral point and comprising a bridge rectifier converting single phase AC power to DC power and using a boost inductor with a boost switch and blocking diode to develop a DC output. An inverter receives DC power and converts DC power to AC power. A link circuit is connected between each boost converter DC output and the inverter circuit and comprises a DC bus having first and second rails to provide a relatively fixed DC voltage for the inverter and a DC bus capacitance across the first and second rails to smooth voltage ripple. A switch controller controls operation of the boost switches using average current control for each of the boost converters.

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Номер записи: 81
13-02-2014 дата публикации

POWER FACTOR CORRECTION CONVERTER

Номер: US20140043877A1
Автор: ISHII Takuya
Принадлежит: Panasonic Corporation

A power factor correction converter includes: a light load detection circuit configured to generate, if supplied power to a load is less than or equal to a predetermined value, a light load detection signal whose level corresponds to the supplied power; a target waveform generation circuit configured to generate, based on an input DC voltage, a target waveform of an inductor current flowing through an inductor; and a drive signal generation circuit configured to generate a drive signal driving a switch such that the inductor current follows the target waveform. The target waveform generation circuit is configured to generate, if the light load detection signal indicates a light load, the target waveform that includes a zero level period in which an amplitude of the target waveform is zero level, the zero level period being adjusted in accordance with the level of the light load detection signal. 1. A power factor correction converter comprising:a rectifier configured to rectify an AC voltage inputted from an AC power supply into an input DC voltage;an inductor, one end of which is connected to a positive output terminal of the rectifier and to which the input DC voltage is applied;a power storage circuit element connected to another end of the inductor via a rectifier circuit element and configured to generate, by storing electric power, an output DC voltage to be outputted to a load;a switch, one main terminal of which is connected to the other end of the inductor and another main terminal of which is connected to a negative output terminal of the rectifier, the switch being configured to perform switching operations of connecting between the inductor and the negative output terminal to store energy in the inductor and disconnecting between the inductor and the negative output terminal to charge the power storage circuit element;a light load detection circuit configured to generate, if supplied power to the load is less than or equal to a predetermined value, a ...

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Номер записи: 82
20-02-2014 дата публикации

POWER FACTOR CORRECTION

Номер: US20140049181A1
Автор: Kelly Jamie, Makwana Deepak
Принадлежит: TRIDONIC GMBH & CO KG

A power factor correction circuit includes an inductor L a diode D a switch Q and a controller An input voltage Vis applied to the inductor L which is cyclically discharged through the diode D by the operation of the switch Q The method of operation includes: operating a controller to obtain an indication of the voltage across the switch Q monitoring the indication of the voltage across the switch Q to determine when the inductor L reaches a discharged state in response to the switch being in an off state, and the switch Q being controlled by the controller to vary the on period of the switch Q during which the inductor is charged, for adjusting an output voltage Vtowards a target value V. The controller monitors at least one of the indication of the voltage across the switch Q and the ratio of the switch on period Tto the switch off period Tfor detecting that the input voltage Vhas a low value. 1113. A method of power factor correction in which an input voltage (V) is applied to an inductor (L) which is cyclically discharged through a diode (D) by the operation of a switch (Q) , the method comprising:{'b': 24', '3, 'operating a controller () to obtain an indication of the voltage across the switch (Q),'}{'b': 3', '1, 'monitoring the indication of the voltage across the switch (Q) to determine when the inductor (L) reaches a discharged state in response to the switch being in an off state, and'}{'b': 3', '24', '3, 'sub': bus', 'bus', {'sub2': '—'}, 'target, 'the switch (Q) being controlled by the controller () to vary the on period of the switch (Q), during which the inductor is charged, for adjusting an output voltage (V) towards a target value (V),'}{'b': 24', '3, 'sub': on', 'off', 'in, 'the controller () monitoring at least one of the indication of the voltage across the switch (Q) or a ratio of the switch on period (T) to the switch off period (T) for detecting that the input voltage (V) has a low value.'}224. The method of claim 1 , wherein the controller () ...

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Номер записи: 83
20-02-2014 дата публикации

NOVEL MULTI-LEVEL CONVERTER TOPOLOGY WITH THE POSSIBILITY OF DYNAMICALLY CONNECTING INDIVIDUAL MODULES IN SERIES AND IN PARALLEL

Номер: US20140049230A1
Автор: Weyh Thomas
Принадлежит: Technische Universitaet Muenchen

The present invention describes an electrical converter system for power supply systems, comprising at least two identical individual modules connected consecutively, characterised in that each individual module have at least four internal switching elements, at least one energy storage element and at least four connectors, wherein the connectors are paired and serve as a first and a second terminal pair; the internal switching elements of each individual module are designed in such manner that they are able to selectively connect one or both connectors of each terminal pair to the energy storage element; the cascaded connection of at least two individual modules is made in such manner that the connectors in the second terminal pair of a preceding individual module are each connected to the connectors of the first terminal pair in the respective following individual module, and at least one terminal of the first terminal pair of the first individual module of the cascaded connection and at least one terminal of the second terminal pair of the last individual module of the cascaded connection serve as terminals for the cascaded connection; and wherein the switching elements of the respective individual modules in the cascaded connection of at least two individual modules connect their respective energy storage element to the terminals of the cascaded connection in such manner that a selective serial or parallel connection of the energy storage elements is made. 122-. (canceled)23. An electrical converter system for power supplies , comprising at least two identical individual modules in a cascade connection , characterised in thateach individual module has at least three, preferably at least four internal switching elements, at least one energy storage element and at least four connectors, wherein the connectors serve in pairs as a first and a second terminal pair; and either the connectors of the first terminal pair of the respective following individual module, or ...

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Номер записи: 84
20-02-2014 дата публикации

PFC SIGNAL GENERATION CIRCUIT, PFC CONTROL SYSTEM USING THE SAME, AND PFC CONTROL METHOD

Номер: US20140049231A1
Автор: Takata Yasuhiro
Принадлежит: RENESAS ELECTRONICS CORPORATION

A PFC signal generation circuit which generates a PFC signal to control a PFC circuit including a first inductor connected to a first switch and a second inductor connected to a second switch includes: a counter whose count value is cleared based on a first timing when a zero current of the first inductor is detected; a counter clear control circuit that clears the counter value after waiting until a cycle lower limit is reached, when the first timing is below the cycle lower limit; a first control signal output unit that outputs a first PFC signal to turn on the first switch at a timing when the count value is cleared; and a second control signal output unit that outputs a second PFC signal to turn on the second switch based on a second timing when a zero current of the second inductor is detected. 1. A PFC signal generation circuit that generates a PFC signal to control a PFC circuit including a first inductor connected to a first switch and a second inductor connected to a second switch , the PFC signal generation circuit comprising:a counter whose count value is cleared based on a first timing at which a zero current of the first inductor is detected;a counter clear control circuit that clears the count value after waiting until a cycle lower limit is reached, when the first timing is below the cycle lower limit;a first control signal output unit that outputs a first PFC signal to turn on the first switch at a timing when the count value is cleared; anda second control signal output unit that outputs a second PFC signal to turn on the second switch, based on a second timing at which a zero current of the second inductor is detected.2. The PFC signal generation circuit according to claim 1 , further comprising a first digital comparator that compares the count value of the counter with a set value of the cycle lower limit claim 1 ,wherein the counter clear control circuit determines whether the first timing is below the cycle lower limit, based on a comparison ...

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Номер записи: 85
20-02-2014 дата публикации

POWER FACTOR CORRECTION

Номер: US20140049993A1
Автор: Bell Wayne, Dalby Paul, Kelly Jamie, Makwana Deepak, McDermott Kevin
Принадлежит: TRIDONIC GMBH & CO KG

A power factor correction circuit includes an inductor L1, a diode D1, a switch Q3 and a controller . An input voltage Vis applied to the inductor L1 which is cyclically discharged through the diode D1 by the operation of the switch Q3. The switch Q3 is controlled by the controller which varies the on period of the switch Q3, during which the inductor is charged, for adjusting an output voltage Vtowards a target value V. The method includes obtaining an indication of the inductor L1 reaching a discharged state in response to the switch being in an off state. The controller monitors at least one of the switch on period Tand the switch off period Tto identify when the input voltage Vis an alternating voltage AC input, and when it is likely to be a non-alternating voltage DC input. When a non alternating voltage is detected, steps may be taken to reduce interference. 12424. A method of power factor correction in which an input voltage (Vin) is applied to an inductor (L1) which is cyclically discharged through a diode (D1) by operation of a switch (Q3) , the switch (Q3) being controlled by a controller () which varies the on period of the switch (Q3) , during which the inductor is charged , for adjusting an output voltage (Vbus) towards a target value (Vbus_target) , the method comprising obtaining an indication of the inductor (L1) reaching a discharged state in response to the switch being in an off state , the controller () monitoring at least one of a switch on period (Ton) or a switch off period (Toff) to identify whether the input voltage (Vin) is an alternating voltage.224. The method of claim 1 , wherein the controller () monitors the switch off period (Toff) to identify whether the input voltage (Vin) is an alternating voltage.3. The method of claim 2 , wherein the controller determines that the input voltage (Vin) is an alternating voltage if the switch off period (Toff) passes a threshold within a predetermined time period.4. The method of claim 2 , wherein ...

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Номер записи: 86
27-02-2014 дата публикации

PASSIVE POWER FACTOR CORRECTION CIRCUIT, ELECTRONIC DEVICE APPLYING THE SAME AND OPERATION METHODS THEREOF

Номер: US20140056046A1
Автор: Chen Po-Yen, LEE Ching-Ran, Pan Ching-Tsai, TSAI Wen-Tien
Принадлежит: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE

A passive power factor correction circuit includes: a DC capacitor and an input capacitor, coupled to a rectifying circuit and charged by a DC voltage from the rectifying circuit; an output capacitor, coupled to a load; first diode and a second diode, coupled to the input capacitor and the output capacitor; and an inductor, coupled to the load, the input capacitor and the output capacitor. Charging into and discharging from the DC capacitor are completed within a half cycle of an input AC voltage. 1. A passive power factor correction circuit , comprising:a DC (direct current) capacitor, coupled to a rectifying circuit, and charged by a DC voltage from the rectifying circuit;an input capacitor, coupled to the rectifying circuit, and charged by the DC voltage from the rectifying circuit;an output capacitor, coupled to a load;a first diode, coupled to the input capacitor and the output capacitor;a second diode, coupled to the input capacitor and the output capacitor; andan inductor, coupled to the load, the input capacitor and the output capacitor;wherein, electric energy stored in the DC capacitor is discharged within a half cycle of an input AC voltage.2. The passive power factor correction circuit according to claim 1 ,wherein the input AC voltage is filtered by a filter and rectified by the rectifying circuit to the DC voltage.3. An electronic device claim 1 , comprising:a filter, for filtering an input AC (alternating current) voltage;a rectifying circuit, coupled to the filter, for rectifying the filtered input AC voltage to a DC voltage;a passive power factor correction circuit, coupled to the rectifying circuit; anda load, driven by the passive power factor correction circuit; a DC capacitor, coupled to the rectifying circuit, and charged by the DC voltage from the rectifying circuit;', 'an input capacitor, coupled to the rectifying circuit, and charged by the DC voltage from the rectifying circuit;', 'an output capacitor, coupled to the load;', 'a first diode, ...

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Номер записи: 87
06-03-2014 дата публикации

POWER SUPPLY APPARATUS WITH POWER FACTOR CORRECTION AND PULSE WIDTH MODULATION MECHANISM AND METHOD THEREOF

Номер: US20140063868A1
Автор: Chiang Chang-Hsun, Shih Yung-Hsiang
Принадлежит: FSP TECHNOLOGY INC.

A power supply apparatus that includes a pulse width modulation (PWM) based power conversion unit and a power factor correction (PFC) conversion unit is provided. The PWM-based power conversion unit is configured to receive a direct current (DC) input voltage and perform pulse width modulation on the received DC input voltage in response to a power supply request of a load, so as to generate a DC output voltage to the load. The PFC conversion unit is coupled to the PWM-based power conversion unit and configured to perform power factor correction on a rectification voltage associated with an alternating current (AC) input voltage, so as to generate the DC input voltage. The PFC conversion unit is further configured to adjust the generated DC input voltage in response to a variation of the load. 1. A power supply apparatus comprising:a pulse-width-modulation-based power conversion unit configured to receive a direct current input voltage and perform pulse width modulation on the received direct current input voltage in response to a power supply request of a load, so as to generate a direct current output voltage to the load; anda power factor correction conversion unit coupled to the pulse-width-modulation-based power conversion unit and configured to perform power factor correction on a rectification voltage associated with an alternating current input voltage, so as to generate the direct current input voltage,wherein the power factor correction conversion unit is further configured to adjust the generated direct current input voltage in response to a variation of the load.2. The power supply apparatus as recited in claim 1 , wherein the pulse-width-modulation-based power conversion unit comprises:a transformer having a primary side and a secondary side, wherein a first terminal of the primary side is configured to receive the direct current input voltage, and the secondary side is configured to provide an alternating current induction voltage;a power switch having ...

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Номер записи: 88
06-03-2014 дата публикации

Digital EMI Filter

Номер: US20140063872A1
Автор: Hamza Djilali, Jain Praveen K.
Принадлежит: SPARQ Systems Inc.

The invention provides a digital active EMI filter that removes, minimizes, or reduces unwanted interference (i.e., EMI noise) generated by a power circuit such as, for example, a power converter. Digital active filtering includes digital sampling of the incident noise signal amplitude and frequency, discrete time conversion of the EMI noise source, processing (e.g., inverting) the digital signal, and then constructing an analog output signal (i.e., an EMI compensation signal) which is injected to the input of the power circuit. A digital EMI filter as described herein may be used in both differential-mode and common-mode configurations, and overcomes limitations of passive and active analog EMI filters. 1. A method for removing , minimizing , or reducing EMI noise generated by a power circuit , comprising:(i) combining at an input of the power circuit an EMI compensation signal with EMI noise generated by the power circuit to produce a combined signal; and producing a digital noise signal from the combined signal;', 'processing the digital noise signal; and', 'constructing an adjusted EMI compensation signal from the processed digital noise signal;, 'wherein sampling and adjusting comprises, '(ii) sampling the combined signal and adjusting the EMI compensation signal;'}(iii) repeating steps (i) and (ii) wherein combining is performed with the adjusted EMI compensation signal;wherein EMI noise at the input of the power circuit is removed, minimized, or reduced.2. The method of claim 1 , wherein sampling includes using a high pass filter and an analog to digital converter to produce the digital noise signal.3. The method of claim 2 , wherein processing includes inverting and providing gain to the digital noise signal.4. The method of claim 3 , wherein constructing includes using a digital to analog converter and a low pass filter to produce the EMI compensation signal.5. The method of claim 4 , wherein the high pass filter claim 4 , gain claim 4 , and low pass filter ...

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Номер записи: 89
06-03-2014 дата публикации

Rectifier circuit and electronic device using same

Номер: US20140063879A1
Автор: Che-Hsun Chen, Chuang-Wei Tseng, Kai-Fu Chen
Принадлежит: Hon Hai Precision Industry Co Ltd

A rectifier circuit includes a three-phase alternating current (AC) voltage, a first rectifier unit, a second rectifier unit, a third rectifier unit, a first voltage output terminal, a second voltage output terminal, a first energy storing circuit and a second energy storing circuit. The three-phase AC voltage generates a first AC voltage, a second AC voltage, and a third AC voltage, and outputs them to the first rectifier circuit, a second rectifier circuit, and a third rectifier circuit correspondingly. The first energy storing circuit and the second storing circuit are connected in series and are coupled between the first voltage output terminal and the second voltage output terminal, to drive a load. In a positive period of each AC voltage, the second energy storing circuit is charged by each rectifier unit. In a negative period of each AC voltage, the first energy storing circuit is charged by each rectifier unit.

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Номер записи: 90
13-03-2014 дата публикации

High efficient single switch single stage power factor correction power supply

Номер: US20140071716A1
Автор: Lin Fuxiang
Принадлежит:

A single switch PFC power supply (including forward and fly-back power supply) in single stage has two transformers: one forward transformer, one main transformer. The main transformer transfers electrical power from the primary circuit to secondary circuit. The forward transformer is used to correct input current waveform. The two transformer's primary windings are connected in series. An extra winding of the forward transformer, a capacitor and two diodes are formed a no loss snubber circuit to enhance the efficiency of the power supply. 1. A single stage PFC fly-back or forward power supply that consists of :A full bridge rectifier with output terminals(a positive terminal and a negative terminal) and input terminals which are coupled to AC power lines;A first capacitor coupled to the output terminals of the full bridge rectifier;An inductor with two terminals, the first terminal and the second terminal which is coupled to the positive output terminal of the full bridge rectifier;A diode with a cathode and an anode which is coupled to the first terminal of the inductor;A second diode with a cathode and an anode which is coupled to the first terminal of the inductor;A forward transformer with three windings, The second winding with a first terminal which is coupled to the cathode of the first diode and a second terminal which is coupled to the cathode of the second diode; The first winding with a first terminal and a second terminal which is coupled to the second terminal of the second winding; The third winding with a first terminal and a second terminal which is coupled to the negative output of the full-bridge rectifier; The second terminals of three windings having the same electrical polarity;A second capacitor with a positive terminal which is coupled to the second terminal of the second winding of the forward transformer and a negative terminal which is coupled to the negative output of the full bridge rectifier;A main transformer with a primary winding and ...

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Номер записи: 91
13-03-2014 дата публикации

USING POWER FACTOR CONTROL TO OPTIMIZE POWER GENERATION AND ALLOCATION

Номер: US20140071723A1
Автор: Wrathall Robert S.
Принадлежит:

The disclosed technology performs power factor correction involving rectifying and adjusting an input power supply signal with a PWM signal. The PWM signal is generated based on a closed feedback signal obtained from a load, as well as adjusted harmonic content retrieved from a sensed input power supply signal. The adjusted harmonic content is produced by extracting a fundamental signal and a plurality of harmonic signals from the sensed input power supply signal, modifying the plurality of harmonic signals by dividing by the fundamental signal, and combining the modified harmonic signals into a duty factor distortion signal. The duty factor distortion signal controls a duty factor of the PWM signal to provide a substantially square wave template. Furthermore, the power factor is increased by forcing the input power supply signal to follow the substantially square wave template. 1. A method for performing power factor correction on an input power supply signal , the method comprising:performing, by a Fourier transformation unit, a Fourier transformation of a current sense signal associated with the input power supply signal to produce a fundamental signal of the current sense signal and a plurality of harmonic signals associated with the current sense signal;adjusting each of the harmonic signals based at least in part on a plurality of wave shaping coefficients to generate a plurality of difference signals;producing, by an inverse Fourier transformation unit, a duty factor distortion signal based at least in part on all of the difference signals;controlling a duty factor of a pulse width modulation (PWM) signal based at least in part on the duty factor distortion signal; andmodifying the input power supply signal using at least the PWM signal.2. The method of claim 1 , wherein the plurality of wave shaping coefficients is based on the fundamental signal and multiple harmonic ratio values.3. The method of claim 2 , wherein each of the wave shaping coefficients ...

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Номер записи: 92
13-03-2014 дата публикации

BRIDGE-LESS STEP-UP SWITCHING POWER SUPPLY DEVICE

Номер: US20140071724A1
Автор: CHIBA Akiteru
Принадлежит: Sanken Electric Co., Ltd.

A bridge-less step-up switching power supply device includes (i) a first and a second reactor having: a first and a second main winding connected to a first and a second input terminal, respectively; and a first and a second auxiliary winding magnetically coupled to the first main winding and connected to the first and second main windings, the first and second auxiliary windings having a first and a second leakage inductance, respectively; (ii) a first and a second diode connected between the first and second auxiliary windings and a first output terminal, respectively; (iii) a first capacitor connected between the first output terminal and a second output terminal; (iv) a second capacitor connected between a connection point of a third switch and a fourth switch, and the first output terminal; and (v) a controller for controlling turning on/off of first to fourth switches. 1. A bridge-less step-up switching power supply device comprising:a first input terminal and a second input terminal connected to an AC power supply;a first output terminal and a second output terminal connected to a load;a first reactor including a first main winding connected to the first input terminal and a first auxiliary winding magnetically coupled to the first main winding and connected to the first main winding, the first auxiliary winding having a first leakage inductance;a second reactor including a second main winding connected to the second input terminal and a second auxiliary winding magnetically coupled to the second main winding and connected to the second main winding, the second auxiliary winding having a second leakage inductance;a first diode connected between the first auxiliary winding of the first reactor and the first output terminal;a second diode connected between the second auxiliary winding of the second reactor and the first output terminal;a first capacitor connected between the first output terminal and the second output terminal;a first switch connected between a ...

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Номер записи: 93
13-03-2014 дата публикации

Controller with punctuated switching control circuit

Номер: US20140071725A1
Автор: Raymond K. Orr
Принадлежит: Power Integrations Inc

A power supply controller includes a switching signal generator, a zero crossing detection (ZCD) circuit, first and second logic gates, and an interval generator. The switching signal generator generates a switching signal and the ZCD circuit generates a ZCD signal that pulses each zero-crossing of an ac input voltage. The first logic gate generates a first output when the ZCD signal pulses while the output of the power supply is below a threshold reference. The second logic gate generates a second output when the ZCD signal pulses while the output of the power supply is above the threshold reference. The interval generator is enabled in response to the first output and disabled in response to the second output. The interval generator allows the switching signal to pass through the interval generator to the switch when enabled and does not allow the switching signal to pass when disabled.

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Номер записи: 94
20-03-2014 дата публикации

Trench mosfet having an independent coupled element in a trench

Номер: US20140077778A1
Автор: Hirokazu Kato, Nobuyoshi Matsuura, Tetsuo Sato, Tomoaki Uno
Принадлежит: Renesas Electronics America Inc

A trench MOSFET is disclosed that includes a semiconductor substrate having a vertically oriented trench containing a gate. The trench MOSFET further includes a source, a drain, and a conductive element. The conductive element, like the gate is contained in the trench, and extends between the gate and a bottom of the trench. The conductive element is electrically isolated from the source, the gate, and the drain. When employed in a device such as a DC-DC converter, the trench MOSFET may reduce power losses and electrical and electromagnetic noise.

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Номер записи: 95
20-03-2014 дата публикации

POWER FACTOR CONTROLLER AND METHOD

Номер: US20140078798A1
Автор: Turchi Joel
Принадлежит: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC

In accordance with an embodiment, a converter includes a power factor controller that varies the switching frequency of a switching transistor in accordance with a signal representative of power at the input of the converter. 1. A method for regulating an output voltage , comprising limiting a switching frequency of a switching device in response to a first signal that is representative of a magnitude of a current from an input of a converter.2. The method of claim 1 , further including operating the converter in a critical conduction mode in response to the first signal being greater than a preset reference voltage.3. The method of claim 2 , further including generating a dead-time in an inductor current in response to the first signal being lower than the preset reference voltage.4. The method of claim 1 , further including reducing the switching frequency of the switching device in response to the first signal being less than the preset reference voltage.5. The method of claim 1 , further including generating a dead-time in an inductor current in response to the first signal being less that the preset reference voltage.6. The method of claim 1 , further including increasing a dead-time in an inductor current in response to decreasing the first signal.7. The method of claim 1 , further including setting a duration of the dead-time in response to a difference between the preset reference voltage and a sum of a level of the first signal and a ramp signal.8. The method of claim 7 , wherein the switching device comprises a power switch having a control electrode and first and second current carrying electrodes claim 7 , and wherein setting the duration of the dead-time further includes synchronizing the duration to a signal at the first current carrying electrode of the power switch.9. The method of claim 1 , further including providing first and second preset reference voltages claim 1 , the first preset reference voltage greater than the second preset reference ...

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Номер записи: 96
27-03-2014 дата публикации

Compensation System For Medium Or High Voltage Applications

Номер: US20140084877A1
Автор: HASLER Jean-Philippe
Принадлежит:

A compensating system for a power system includes a compensator including semiconductor switch means, which compensator has phase legs which on a first side of the compensator defines AC inputs for connection to a respective phase of the power system. The phase legs are connected in wye connection at a second side of the compensator, which wye connection has a neutral point. A filter arrangement at a first side thereof is connected to the neutral point of the wye connection and at a second side is connected to the AC inputs to thereby form a circuit with the compensator. The filter arrangement is arranged such that the circuit acts essentially as an open circuit for positive sequence currents or voltages and negative sequence currents or voltages, and as a closed circuit for zero-sequence currents. 1. A compensating system for a power system , wherein the compensating system comprises:a compensator comprising semiconductor switch means, which compensator has phase legs which on a first side of the compensator defines AC inputs for connection to a respective phase of the power system, wherein the phase legs are connected in wye connection at a second side of the compensator, which wye connection has a neutral point, anda filter arrangement which at a first side thereof is connected to the neutral point of the wye connection and at a second side is connected to the AC inputs to thereby form a circuit with the compensator,wherein the filter arrangement is arranged such that the circuit acts essentially as an open circuit for positive sequence currents and voltages and negative sequence currents or voltages, and as a closed circuit for zero-sequence currents, wherein the filter arrangement is further arranged to block a zero-sequence current having a fundamental frequency and to allow a harmonic of the zero-sequence current to pass therethrough, whereby the harmonic of the zero-sequence current is able to flow through the closed circuit.2. The compensating system as ...

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Номер записи: 97
10-04-2014 дата публикации

Power supply and startup circuit thereof

Номер: US20140097822A1
Автор: Fu-Chun Huang, Hung-Che Chou, Pao-Chuan Lin
Принадлежит: Excelliance Mos Corp

A power supply and its startup circuit are provided. The startup circuit includes a first transistor, a bias resistor, a pull-down switch, a voltage detector, and a discharging path generator. A first end of the first transistor receives alternating current (AC) input power. The bias resistor is serially coupled between a second end and a control end of the first transistor. The pull-down switch is turned on or turned off according to a detection result. The voltage detector generates the detection result by detecting a voltage on the second end of the first transistor. The discharging path generator provides a discharging path between the second end of the first transistor and a reference ground voltage according to the detection result.

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Номер записи: 98
10-04-2014 дата публикации

POWER SOURCE APPARATUS

Номер: US20140098583A1
Автор: Chalermboon Nadthawut, NISHIBORI Kohei
Принадлежит: MINEBEA CO., LTD.

A power source apparatus includes: a first series circuit that has a first rectifier element, a first switching element, and a third rectifier element; a second series circuit that has a second rectifier element, a second switching element, and a fourth rectifier element; a reactor connected between a connecting point of the first rectifier element and the first switching element and a connecting point of the second rectifier element and the second switching element; and a current detection unit having a first resistor element. The first and second switching elements are controllable based on a first zero current detection signal in accordance with a first current detected in the current detection unit, and a desired direct current voltage is fed to a load circuit. 1. A power source apparatus comprising:a power factor correction circuit comprising:a first series circuit that consists of a first rectifier element, a first switching element, and a third rectifier element,a second series circuit that consists of a second rectifier element, a second switching element, and a fourth rectifier element, and is connected in parallel to the first series circuit,a smoothing capacitor that is connected in parallel to the first and second series circuits and a load circuit, anda reactor, one end of which is connected to a connecting point between the first rectifier element and the first switching element and the other end of which is connected to a connecting point between the second rectifier element and the second switching element; anda control circuit unit that inputs an alternating current voltage of an AC power source and an output voltage output to the load circuit, and controls a switching operation of at least the first and second switching elements;wherein one end of the AC power source is connected to a connecting point between the first switching element and the third rectifier element and the other end of the AC power source is connected to a connecting point ...

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Номер записи: 99
01-01-2015 дата публикации

REDUCING CURRENT HARMONICS AT LIGHT LOADS

Номер: US20150002107A1
Автор: Bemat Mohamed Amin, Humphrey Daniel
Принадлежит:

Reducing current harmonics at light loads is disclosed. In an example, a method includes increasing output voltage of a boost converter to reach a higher potential in a low power mode. After reaching the higher potential, the method includes dropping a set point for the output voltage. 1. A method to reduce current harmonics at light loads , comprising:increasing output voltage of a boost converter to reach a higher potential in a low power mode; andafter reaching the higher potential, dropping a set point for the output voltage.2. The method of claim 1 , further comprising stopping switching of the boost converter after the output voltage reaches the set point to eliminate all harmonic content from the boost converter.3. The method of claim 1 , further comprising after the output voltage drops to the set point claim 1 , waiting for a subsequent zero-cross of an input voltage before ramping up the output voltage to the higher potential again.4. The method of claim 1 , further comprising setting the output voltage to a default value before entering the low power mode.5. The method of claim 4 , wherein the default value is selected such that at least one half cycle worth of energy is stored in capacitance at output of the boost converter.6. The method of claim 5 , wherein one half cycle worth of energy is maintained as a buffer while waiting for a subsequent zero-crossing.7. The method of claim 1 , wherein a rate of increasing the output voltage of the boost converter is selected such that the output voltage reaches the higher potential in an integer number of input half cycles.8. The method of claim 7 , wherein a rate of increasing the output voltage of the boost converter appears as a higher load on a power supply and reduces input harmonic content during charging.9. The method of further comprising entering the low power mode when the output power drops below a threshold.10. A power factor correction circuit with current harmonics reduction at light loads claim 1 , ...

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Номер записи: 100