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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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Применить Всего найдено 6709. Отображено 100.
26-01-2012 дата публикации

Predictive synchronous rectification controller, switching power converter with predictive synchronous rectification controller and controlling method thereof

Номер: US20120020123A1
Автор: Ta-Ching Hsu
Принадлежит: Niko Semiconductor Co Ltd

A predictive synchronous rectification controller for controlling at least one synchronous rectification switch is provided. The synchronous rectification controller has a ramp generator, a peak sampling unit, and an output control unit. The ramp generator receives a synchronous signal and generates a ramp signal accordingly. The peak sampling unit generates a predicted reference voltage signal by retrieving a peak voltage of the ramp signal. The output control unit compares the ramp signal with the predicted reference voltage signal to generate a synchronous rectification control signal to control a conducting state of the switch.

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Номер записи: 1
16-02-2012 дата публикации

Systems and methods for off-time control in a voltage converter

Номер: US20120039093A1
Автор: Jin Liang, John R. Wiggenhorn, Lin Sheng, Rais K. Miftakhutdinov, Steven Tumasz
Принадлежит: Texas Instruments Inc

Various embodiments of the present invention provide voltage converters and methods for using such. As one example, a voltage converter is disclosed that includes a transformer with a first winding and a second winding. A voltage is applied to the first winding for a period that is followed by an OFF time. The voltage converter further includes an OFF time controller that is operable to adjust the OFF time based at least in part on a load current traversing the second winding.

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Номер записи: 2
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: 3
20-09-2012 дата публикации

Battery charging apparatus

Номер: US20120235626A1
Автор: Hyung Tae MOON, Sun Min Hwang, Sung Min Oh, Tae Kyung MOON
Принадлежит: Individual

A battery charging apparatus includes a converting unit, first and second charging units and a switching unit. The converting unit separately convert AC power into a first voltage and a second voltage. The first charging unit drops the converted first voltage and charge a high voltage battery with the dropped first voltage. The second charging unit drops the converted second voltage or a third voltage of the high voltage battery, and charges an auxiliary battery with the dropped second or third voltage. The switching unit performs, in a first mode, the charging of the high voltage battery and the auxiliary battery by the AC power, and in a second mode, stops the charging of the high voltage battery by the AC power and performs the charging of the auxiliary battery by the third voltage.

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Номер записи: 4
20-09-2012 дата публикации

Power converter having high efficiency at low load

Номер: US20120236603A1
Автор: Li-Hao Liu, Lien-Hsing Chen
Принадлежит: Power Mate Technology Co Ltd, Powermate Technology Co Ltd

A power converter includes a DC power source, a transformer having a first winding, a first MOSET and a PWM controller at the primary side and a second winding, a drive control unit, a current detection control unit, a comparator and a second MOSFET at the secondary side. The comparator has its input end electrically connected to the current detection control unit and its output end electrically connected to the drive control unit, which is electrically connected to the second MOSFET for synchronous rectification. The second MOSFET is electrically connected to one end of the second winding, having a body diode built therein. The second winding and the second MOSFET constitute a combination circuit electrically connected to a load that has a capacitor electrically connected thereto in a parallel manner. By means of the aforesaid arrangement, conduction loss at a low load is minimized, thereby improving the efficiency at a low load.

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Номер записи: 5
20-09-2012 дата публикации

Ultralow no-load conduction loss dc power converter

Номер: US20120236605A1
Автор: Li-Hao Jiu, Lien-Hsing Chen
Принадлежит: Power Mate Technology Co Ltd, Powermate Technology Co Ltd

An ultralow no-load conduction loss DC converter includes a DC power source, a transformer having a first winding, a first MOSET and a PWM controller at the primary side and a second winding, a third winding, a drive control unit, a rectifier unit and a second MOSFET at the secondary side. The second MOSFET, the drive control unit and the rectifier unit constitutes a combination circuit electrically coupled between one end of the second winding and one end of the third winding. The second MOSFET has set therein a body diode. The second winding and the second MOSFET forms a combination circuit electrically connected to a load. Thus, the decision to turn off the drive control unit is made at the secondary side so that non-load conduction loss can be minimized.

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Номер записи: 6
20-09-2012 дата публикации

Resonant converter apparatus and method thereof

Номер: US20120236610A1
Автор: Tai Keung Lee, Wing Ling Cheng, Xiao Fen Zhong, Yi Cai
Принадлежит: Astec International Ltd

A resonant converter apparatus includes a plurality of resonant converters connected in parallel, and a control module outputting a pulse width modulation (PWM) control signal to the resonant converters. The control module includes a voltage control loop and a circuit control loop. The voltage control loop compares the sensed output voltage with a predetermined reference voltage, and outputs a PWM control signal to one of the resonant converters so the output voltage of the one converter is equal to the predetermined reference voltage. The current control loop uses the sensed output current of the one converter as a reference current, compares the reference current with the sensed output current from each of the other resonant converters, generates a frequency adjusting variable, and calculates the individual PWM control signal for each of the other converters so the output currents of the plurality of converters are the same.

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Номер записи: 7
18-10-2012 дата публикации

Ac/dc converter circuit

Номер: US20120262966A1
Автор: Peter Luerkens
Принадлежит: KONINKLIJKE PHILIPS ELECTRONICS NV

The invention relates to an AC/DC converter circuit ( 100 ) and a method for converting N≧2 AC supply voltages (U 1, U 2, U 3 ) into DC voltage. This is achieved by feeding the AC supply voltages to first terminals (a 1, a 2, a 3 ) of full bridge converters ( 11, 12, 13 ), wherein the second terminals (b 1, b 2, b 3 ) of these rectifiers are coupled to each other. The outputs (d 11, d 1′, d 2, d 2′, d 3, d 3′ ) of the rectifiers are fed to the DC terminals of intermediate converters ( 21, 22, 23 ). The AC terminals (e 1, e 1′, e 2, e 2′, e 3, e 3′ ) of the intermediate converters are connected to the primary sides of transformers ( 31, 32, 33 ), wherein the secondary sides of these transformers are provided to further rectifiers ( 41, 42, 43 ). The circuit design allows using MosFETs of limited voltage capability for processing 380 V three-phase AC current, thus achieving a high efficiency.

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Номер записи: 8
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: 9
31-01-2013 дата публикации

Regulation circuit associated with synchronous rectifier providing cable compensation for the power converter and method thereof

Номер: US20130027987A1
Автор: Chou-Sheng Wang, Ta-Yung Yang
Принадлежит: System General Corp Taiwan

A regulation circuit of a power converter for cable compensation according to the present invention comprises a signal generator generating a compensation signal in accordance with a synchronous rectifying signal. An error amplifier has a reference signal for generating a feedback signal in accordance with an output voltage of the power converter. The compensation signal is coupled to program the reference signal. The feedback signal is coupled to generate a switching signal for regulating an output of the power converter. The regulation circuit of the present invention compensates the output voltage without a shunt resistor to sense the output current of the power converter for reducing power loss.

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Номер записи: 10
14-02-2013 дата публикации

Power supply method and apparatus

Номер: US20130038392A1
Автор: Eric Mendenhall
Принадлежит: Individual

A method and apparatus for providing a power supply for an amplifier is provided. The power conversion is achieved using synchronous rectifiers in a regulated half bridge power supply, taking the sum of the positive and negative rails as feedback, in order facilitate energy transfer between positive and negative output rails. This minimizes the effects of off side charging and rail sag, as well as achieving good line regulation, while allowing use of very small, low value output capacitors.

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Номер записи: 11
28-03-2013 дата публикации

Semiconductor device

Номер: US20130075750A1
Автор: Yuichi Minoura
Принадлежит: Fujitsu Ltd

A semiconductor device includes a first semiconductor layer formed on a substrate; a second semiconductor layer formed on the first semiconductor layer; a third semiconductor layer formed on the second semiconductor layer; a gate electrode formed on the third semiconductor layer; and a source electrode and a drain electrode formed on the second semiconductor layer. The third semiconductor layer is formed with a semiconductor material doped with a p-type impurity element. In the third semiconductor layer, a p-type area is formed immediately below the gate electrode, and a high resistance area having a higher resistance than the p-type area is formed in an area other than the p-type area.

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Номер записи: 12
28-03-2013 дата публикации

Compound semiconductor device and method of manufacturing the same

Номер: US20130075751A1
Автор: Kenji Imanishi
Принадлежит: Fujitsu Ltd

An embodiment of a compound semiconductor device includes: a substrate; an electron channel layer and an electron supply layer formed over the substrate; a gate electrode, a source electrode and a drain electrode formed on or above the electron supply layer; a p-type semiconductor layer formed between the electron supply layer and the gate electrode; and a hole barrier layer formed between the electron supply layer and the p-type semiconductor layer, a band gap of the hole barrier layer being larger than that of the electron supply layer.

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Номер записи: 13
04-04-2013 дата публикации

Resonant power conversion apparatus

Номер: US20130083564A1
Автор: Ju-Lu Sun, Qiao-Liang CHEN, Yong-Jiang Bai
Принадлежит: Individual

A resonant power conversion apparatus including a transformer-based resonant converter and first and second switch control units is provided. The transformer-based resonant converter includes a primary switch circuit and a secondary output circuit configured to provide an output voltage to a load. The first switch control unit is configured to control an ON/OFF operation of the primary switch circuit in response to a status of the load. The second switch control unit is configured to determine whether to activate or inactivate the first switch control unit. When the status of the load is the light-loading or the no-loading, the first switch control unit intermittently controls the ON/OFF operation of the primary switch circuit, and meanwhile, the first switch control unit is inactivated during the primary switch circuit is disabled, so as to substantially reduce the light-loading or no-loading loss of the resonant power conversion apparatus.

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Номер записи: 14
02-05-2013 дата публикации

Dc to dc convertor

Номер: US20130107582A1
Автор: Tadahiko Sato
Принадлежит: Fuji Electric Co Ltd

A DC to DC converter can include a reverse-blocking semiconductor switch that makes a synchronously rectifying MOSFET become parallel-connected with a capacitor that is connected to a power supply of a controller IC for a conventionally used synchronously rectifying circuit. The reverse-blocking semiconductor switch can be driven either by signals for adjusting a voltage of the capacitor within a permitted range of voltage of the power supply of the controller circuit, or by signals that are determined by a signal obtained from voltage across the MOSFET and the signals for adjusting a voltage of the capacitor within a permitted range of voltage of the power supply of the controller circuit.

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Номер записи: 15
05-09-2013 дата публикации

Solar Photovoltaic Power Conditioning Units

Номер: US20130229842A1
Автор: Paul Garrity
Принадлежит: Enecsys Ltd

We describe a photovoltaic power conditioning unit comprising: both dc and ac power inputs; a dc link; at least one dc-to-dc converter coupled between dc input and dc link; and a dc-to-ac converter coupled between dc link and ac output. The dc-to-dc converter comprises: a transformer having input and output windings; an input dc-to-ac converter coupled between dc input and input winding; and an ac-to-dc converter coupled between output winding the dc link. The output winding has a winding tap between the first and second portions. The ac-to-dc converter comprises: first and second rectifiers, each connected to a respective first and second portion of the output winding, to the dc link and winding tap; and a series inductor connected to the winding tap. Rectifiers are connected to the winding tap of the output winding via the series inductor wherein the series inductor is shared between the first and second rectifiers.

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Номер записи: 16
24-10-2013 дата публикации

Power supply device and a synchronous rectifier pcb

Номер: US20130279207A1
Автор: Chi-Che Wu, Liang-Hong Wang, Wei-Cheng Yu
Принадлежит: Lite On Technology Corp, LITE-ON ELECTRONICS(GUANGZHOU)LIMITED

A power supply device includes a main unit and a power switching module. The main unit includes a primary circuit board, a transformer including a primary and a secondary coil, a primary-side circuit and a secondary-side circuit. The power switching module includes a separate PCB formed with at least two connection pads and two conductive tracks, and at least one power switching element disposed on the PCB and having two terminals respectively connected to the two connection pads through the two conductive tracks. The power switching module is in the form of a separate PCB that is electrically connected to the primary- or secondary-side circuits through the two connection pads.

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Номер записи: 17
02-01-2014 дата публикации

Synchronous rectification control circuit and power supply thereof

Номер: US20140003096A1
Автор: Jian Deng
Принадлежит: Hangzhou Silergy Semiconductor Technology LTD

In one embodiment, a synchronous rectification control circuit in a flyback converter, can include: a first control circuit that receives a drain-source voltage signal of a synchronous rectifier switch and a flyback converter output voltage, and generates a first control signal based on a conduction time of a primary-side power switch; a second control circuit configured to receive the drain-source voltage signal, and to generate a second control signal; when the primary-side power switch is turned off, and the first control signal is greater than a threshold value, the second control signal controls a switching operation of the synchronous rectifier switch; and when the primary-side power switch is turned off, and the first control signal is less than the threshold value, the synchronous rectifier switch is configured to stop operation, before the primary-side power switch is turned on again.

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Номер записи: 18
13-02-2014 дата публикации

Novel control method to reduce switching loss on mosfet

Номер: US20140043863A1
Автор: Mark Telefus, Wei Li
Принадлежит: FLEXTRONICS AP LLC

A method of controlling a switching mode power converter enables zero voltage switching by forcing a voltage across the main switch to zero. This is accomplished by sensing when a current on the secondary side of the power converter drops to zero, or other threshold value, and then generating a negative current through the secondary winding in response. The negative secondary current results in a corresponding discharge current in the primary winding, which reduces the voltage across the main switch. The voltage across the main switch is monitored such that when the voltage reaches zero, or other threshold value, the main switch is turned ON. In this manner, the circuit functions as a bi-directional current circuit where a forward current delivers energy to a load and a reverse current provides control for reducing the voltage across the main switch to enable zero voltage switching.

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Номер записи: 19
20-03-2014 дата публикации

Synchronous rectifying control method and circuit for isolated switching power supply

Номер: US20140078788A1
Автор: Chen Zhao, Jie Yao
Принадлежит: Hangzhou Silergy Semiconductor Technology LTD

Disclosed are synchronous rectifying control methods and circuits for an isolated switching power supply. In one embodiment, a method can include: (i) generating a ramp voltage based on a power terminal voltage, where the power terminal voltage includes a voltage between first and second power terminals of a synchronous rectifier in the isolated switching power supply; (ii) determining whether the power terminal voltage starts declining; (iii) comparing the ramp voltage to a threshold voltage when the power terminal voltage starts to decline, where the threshold voltage substantially matches a minimum conduction time of the synchronous rectifier; (iv) reducing the ramp voltage and controlling the synchronous rectifier in an off state when the ramp voltage is lower than the threshold voltage; and (v) reducing the ramp voltage and controlling the synchronous rectifier in on state when the ramp voltage is higher than the threshold voltage.

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Номер записи: 20
13-01-2022 дата публикации

POWER SUPPLY SYSTEM

Номер: US20220014107A1
Автор: Cohen Isaac
Принадлежит:

A circuit includes a transformer having first and second transformer inputs and first and second transformer outputs. The first transformer output can be adapted to be coupled through a capacitor to a first input of an output stage. The second transformer output can be adapted to be coupled to a second input of the output stage. The circuit also includes a switching system having first and second inputs and first and second switching outputs. The first input can be configured to receive a switching signal. The second input can be configured to receive an input voltage. The first and second switching outputs respectively can be coupled to the first and second transformer inputs. 1. A circuit comprising:a transformer having first and second transformer inputs and first and second transformer outputs, the first transformer output adapted to be coupled through a capacitor to a first input of an output stage, and the second transformer output adapted to be coupled to a second input of the output stage; anda switching system having first and second inputs and first and second switching outputs, the first input configured to receive a switching signal, the second input configured to receive an input voltage, and the first and second switching outputs respectively coupled to the first and second transformer inputs.2. The circuit of claim 1 , wherein the switching signal has a frequency that is less than a resonant frequency of the capacitor and a secondary winding of the transformer.3. The circuit of claim 1 , wherein the switching system is arranged as one of a full-bridge switching system claim 1 , a half-bridge switching system claim 1 , and a push-pull switching system.4. The circuit of claim 1 , wherein the switching system comprises switches that are controlled by the switching signal having a frequency claim 1 , the circuit further comprising a load regulator having a first input that samples a current through a primary winding of the transformer and an output that ...

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Номер записи: 21
13-01-2022 дата публикации

SYSTEMS AND METHODS FOR DETECTION AND CONTROL RELATED TO CHARGING

Номер: US20220014108A1
Автор: Yao Chao, Zhang Yunchao
Принадлежит:

Controller and method for charging one or more loads. For example, the controller for charging one or more loads includes: a controller terminal configured to be biased at a first voltage related to a second voltage of a secondary winding of a power converter, the power converter further including a primary winding coupled to the secondary winding, the power converter being configured to, if the power converter is not unplugged from a voltage supply for an AC input voltage, receive the AC input voltage represented by the second voltage and output an output power to the one or more loads; and a voltage detector configured to: process information associated with the first voltage; and determine whether the AC input voltage is in a first voltage state or in a second voltage state based at least in part on the first voltage. 1. A controller for charging one or more loads , the controller comprising:a controller terminal configured to be biased at a first voltage related to a second voltage of a secondary winding of a power converter, the power converter further including a primary winding coupled to the secondary winding, the power converter being configured to, if the power converter is not unplugged from a voltage supply for an AC input voltage, receive the AC input voltage represented by the second voltage and output an output power to the one or more loads; and process information associated with the first voltage; and', 'determine whether the AC input voltage is in a first voltage state or in a second voltage state based at least in part on the first voltage;, 'a voltage detector configured to if the AC input voltage is determined to be in the first voltage state, cause the power converter to set the output power at a first power level;', 'if the AC input voltage is determined in the second voltage state, cause the power converter to set the output power at a second power level;', the first voltage state and the second voltage state are different; and', 'the first ...

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Номер записи: 22
13-01-2022 дата публикации

Auto-Tuned Synchronous Rectifier Controller

Номер: US20220014111A1
Автор: Radic Aleksandar
Принадлежит: Silanna Asia Pte Ltd

An apparatus includes a high-pass filter circuit configured to receive a drain-source voltage from a drain node of a synchronous rectifier switch at a secondary-side of a power converter and to generate a filtered drain-source voltage using the received drain-source voltage. A current comparison circuit of the apparatus is configured to receive a current indicative of a current through the synchronous rectifier switch and to generate a current comparison signal using the received current. An auto-tuning controller of the apparatus is configured to turn the synchronous rectifier switch on upon determining a body diode conduction of the synchronous rectifier switch, commence an auto-tuned delay upon determining that the current through the synchronous rectifier switch has changed direction, turn the synchronous rectifier switch off upon expiration of the auto-tuned delay, and update, during a detection window of time, a duration of the auto-tuned delay based on the filtered drain-source voltage. 1. An apparatus comprising:a high-pass filter circuit configured to receive a drain-source voltage from a drain node of a synchronous rectifier switch at a secondary-side of a power converter and to generate a filtered drain-source voltage using the received drain-source voltage; andan auto-tuning controller configured to:turn the synchronous rectifier switch on upon detecting a body diode conduction of the synchronous rectifier switch;commence an auto-tuned delay upon determining that a current through the synchronous rectifier switch has changed direction;turn the synchronous rectifier switch off upon expiration of the auto-tuned delay; andupdate, during a detection window of time, a duration of the auto-tuned delay based on the filtered drain-source voltage.2. The apparatus of claim 1 , wherein:a voltage at a drain node of a primary-side switch of the power converter is reduced, when the synchronous rectifier switch is on, by an amount corresponding to the duration of the ...

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Номер записи: 23
04-01-2018 дата публикации

INSULATED SYNCHRONOUS RECTIFICATION DC/DC CONVERTER

Номер: US20180006569A1
Автор: Kikuchi Hiroki
Принадлежит:

A synchronous rectification controller configured to control a synchronous rectification transistor is provided on the secondary side of an insulated synchronous rectification DC/DC converter. A DRAIN pin receives the drain voltage Vof the synchronous rectification transistor. A pulse generator generates a pulse signal Sbased on the voltage at the DRAIN pin. A driver drives the synchronous rectification transistor based on the pulse signal S. Upon detecting an open-circuit fault of the DRAIN pin, an abnormality detection circuit asserts an abnormality detection signal S. 1. A synchronous rectification controller structured to control a synchronous rectification transistor of an insulated synchronous rectification DC/DC converter , the synchronous rectification controller comprising:a drain pin structured to receive a drain voltage of the synchronous rectification transistor;a pulse generator structured to generate a pulse signal based on a voltage at the drain pin;a driver structured to drive the synchronous rectification transistor based on the pulse signal; andan abnormality detection circuit structured to assert an abnormality detection signal when an open-circuit fault of the drain pin is detected.2. The synchronous rectification controller according to claim 1 , wherein the abnormality detection circuit is structured such that claim 1 , when no cyclic signal occurs at the drain pin claim 1 , and when the DC/DC converter generates an output voltage claim 1 , the abnormality detection signal is asserted.3. The synchronous rectification controller according to claim 1 , wherein the abnormality detection circuit is structured such that claim 1 , when the pulse signal is maintained at a constant value claim 1 , and when the DC/DC converter generates an output voltage claim 1 , the abnormality detection signal is asserted.4. The synchronous rectification controller according to claim 2 , wherein the abnormality detection circuit comprises a comparator structured to ...

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Номер записи: 24
04-01-2018 дата публикации

TIME-INTERLEAVING CONVERTER AND CONTROL METHOD THEREOF

Номер: US20180006574A1
Автор: CHOI WooJae, YOON Kwang Ho
Принадлежит: Silicon Mitus, Inc.

A converter that may include: a power stage configured to include at least one inductor and a plurality of switching devices, and configured to be able to operate in a buck mode, a boost mode, or a buck-boost mode according to the control; and a controller configured to apply, to the power stage, two or more operation modes selected from the buck mode, the boost mode, or the buck-boost mode, and configured to periodically change the operation mode of the power stage. 1. A converter comprising:a power stage configured to include at least one inductor and a plurality of switching devices, and configured to be able to operate in a buck mode, a boost mode, or a buck-boost mode according to the control; anda controller configured to apply, to the power stage, two or more operation modes selected from the buck mode, the boost mode, or the buck-boost mode, and configured to periodically change the operation mode of the power stage.2. The converter according to claim 1 , wherein a lowest voltage in a variable range of an output voltage of the power stage is lower than an input voltage and a highest voltage thereof is higher than the input voltage.3. The converter according to claim 1 , wherein the controller is configured to:operate the power stage in one of the buck mode, the boost mode, or the buck-boost mode in a first time period of one cycle;operate the power stage in another of the buck mode, the boost mode, or the buck-boost mode in a second time period of the one cycle; andcontrol the first time period and the second time period to be variable.4. A converter comprising:a power stage configured to includean inductor,a first switching device configured to have one side connected to an input voltage and the other side connected to the inductor,a second switching device configured to have one side connected to an output voltage and the other side connected to the inductor,a third switching device configured to have one side connected to the first switching device and ...

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Номер записи: 25
07-01-2021 дата публикации

MAGNETICALLY COUPLED GALVANICALLY ISOLATED COMMUNICATION USING LEAD FRAME

Номер: US20210006167A1
Автор: Balakrishnan Balu, Matthews David Michael Hugh
Принадлежит: POWER INTEGRATIONS, INC.

An integrated circuit package includes a lead frame and an encapsulation that substantially encloses the lead frame. The lead frame further includes a first conductor comprising a first conductive loop and a second conductor galvanically isolated from the first conductor, proximate to and magnetically coupled to the first conductive loop to provide a communication link between the first and second conductor. The second conductor includes a first conductive portion, a second conductive portion, and a wire coupling together the first conductive portion and the second conductive portion. 1. An integrated circuit package , comprising:an encapsulation; and a first conductive loop disposed substantially within the encapsulation;', 'a second conductive loop disposed substantially within the encapsulation and substantially all of the second conductive loop is outside of the first conductive loop; and', 'wherein the first and second conductive loops are configured to form a magnetically coupled communication link.', 'a galvanic isolator coupled to the first conductive loop such that there is galvanic isolation between the first and the second conductive loops,'}], 'a lead frame, a portion of the lead frame disposed within the encapsulation, the lead frame comprising2. The integrated circuit package of claim 1 , further comprising:a first circuit coupled to the first conductive loop; and wherein one of the first and second circuits is configured to control properties of a transmitter current to produce a changing magnetic field in proximity to a corresponding one of the first and second conductive loops, thereby inducing a voltage that is generated across an other one of the first and second conductive loops that is subjected to the changing magnetic field and results in a current flow in the other one of the inner and outer conductive loops, and', 'wherein the other one of the first and second circuits is configured to receive an electrical parameter induced by the one of ...

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Номер записи: 26
07-01-2021 дата публикации

Self-Adjusting Current Injection Technology

Номер: US20210006170A1
Автор: Ionel Jitaru
Принадлежит: Rompower Technology Holdings LLC

A method includes providing a transformer with primary and current injection windings, a primary switch connected to the primary winding, a parasitic capacitance reflected across the primary switch, a secondary rectifier means, and a current injection circuit including a current injection switch connected to the current injection winding, and a unidirectional current injection switch connected to the current injection winding. The method includes switching on the current injection switch to start a current injection flowing from a controlled voltage source, through the unidirectional current injection switch and further through the current injection winding. The current injection reflects into the primary winding, thereby discharging the parasitic capacitance reflected across the primary switch. The method includes turning on the primary switch with a delay time after the current injection switch turns on and turning off the current injection switch after the current injection reaches zero amplitude.

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Номер записи: 27
07-01-2021 дата публикации

DC-DC CONVERTER WITH PRE-CHARGING OF A FIRST ELECTRICAL NETWORK FROM A SECOND ELECTRICAL NETWORK

Номер: US20210006171A1
Автор: Askeur Mimoun, Diallo Massourang
Принадлежит:

The invention relates to an insulated DC-DC converter, in particular for a motor vehicle, comprising—a first circuit, connected to a first electrical grid, and including a primary branch comprising at least one induction coil,—a second circuit, connected to a second electrical grid, and comprising a secondary branch comprising at least one induction coil, each induction coil of the primary branch being coupled with an induction coil of the secondary branch in order to form a transformer. According to the invention, said converter comprises at least one additional branch comprising at least one additional induction coil, said at least one additional branch being connected to the electrical grid, and said at least one additional induction coil being coupled with an induction coil of the secondary branch so that, according to one operating mode, the insulated DC-DC converter transfers energy from the low-voltage vehicle electrical grid to the electrical grid, in particular for pre-charging purposes. 110-. (canceled)11. An isolated DC-DC converter , notably for an automobile vehicle , comprising:a first interface terminal configured to be connected to a first electrical network,a second interface terminal configured to be connected to a second electrical network,a first circuit, connected to the first interface terminal, and comprising at least one primary branch comprising at least one inductive coil,a second circuit, connected to the second interface terminal, and comprising a secondary branch comprising at least one inductive coil,each inductive coil of said at least one primary branch being coupled to an inductive coil of the secondary branch to form at least one transformer,such that, according to a first operating mode, the isolated DC-DC converter is configured to transfer energy from the first electrical network to the second electrical network, through the first and second circuits, via the magnetic circuit(s) formed by the coupled inductive coils of the ...

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Номер записи: 28
07-01-2021 дата публикации

SWITCHING CONTROL CIRCUIT, SWITCHING CONTROL METHOD AND FLYBACK CONVERTER THEREOF

Номер: US20210006172A1
Автор: Bai Yongjiang, Hu Zhiliang, Huang Qiukai, Li Xinlei
Принадлежит:

A switching control circuit for a flyback converter having a main switch coupled to a primary winding of a transformer and a rectifier switch coupled to a secondary winding of the transformer, can include: a first voltage generating circuit configured to generate a first voltage sampling signal representing information of an input voltage; a synchronous rectification control circuit configured to adjust an on-time of the rectifier switch according to the first voltage sampling signal in order to adjust an absolute value of a negative current flowing through the secondary winding; and where the negative current is configured to discharge a parasitic capacitor of the main switch in order to reduce a drain-source voltage of the main switch. 1. A switching control circuit for a flyback converter having a main switch coupled to a primary winding of a transformer and a rectifier switch coupled to a secondary winding of the transformer , the switching control circuit comprising:a) a first voltage generating circuit configured to generate a first voltage sampling signal representing information of an input voltage;b) a synchronous rectification control circuit configured to adjust an on-time of the rectifier switch according to the first voltage sampling signal in order to adjust an absolute value of a negative current flowing through the secondary winding; andc) wherein the negative current is configured to discharge a parasitic capacitor of the main switch in order to reduce a drain-source voltage of the main switch.2. The switching control circuit of claim 1 , wherein the main switch is turned on when the drain-source voltage of the main switch resonates to the lowest value.3. The switching control circuit of claim 1 , wherein the synchronous rectification control circuit is configured to:a) increase the on-time of the rectifier switch to increase the absolute value of the negative current flowing through the secondary winding when the input voltage increases; andb) ...

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Номер записи: 29
07-01-2021 дата публикации

RECTIFYING CIRCUIT AND SWITCHED-MODE POWER SUPPLY INCORPORATING RECTIFYING CIRCUIT

Номер: US20210006173A1
Автор: HAMACHI Kenji, KOMATSU Akeyuki
Принадлежит: ROHM CO., LTD.

Disclosed are a rectifying circuit and a switched-mode power supply. The rectifying circuit includes a first rectifying section for rectifying a positive induced voltage generated across a secondary winding of a transformer, a second rectifying section for rectifying a negative induced voltage generated across the secondary winding, and an inductance section connected between the first rectifying section and the second rectifying section. The switched-mode power supply includes a transformer having a primary winding and a secondary winding, a drive circuit for switchingly driving the primary winding of the transformer, and the rectifying circuit connected to the secondary winding of the transformer. 1. A rectifying circuit comprising:a first rectifying section for rectifying a positive induced voltage generated across a secondary winding of a transformer;a second rectifying section for rectifying a negative induced voltage generated across the secondary winding; andan inductance section connected between the first rectifying section and the second rectifying section.2. The rectifying circuit according to claim 1 , whereinthe inductance section includes an auxiliary winding coupled to a primary winding of the transformer.3. The rectifying circuit according to claim 2 , whereina degree of coupling between the primary winding and the auxiliary winding is smaller than a degree of coupling between the primary winding and the secondary winding.4. The rectifying circuit according to claim 2 , whereinthe inductance section includes a connection coil for limiting a short-circuiting current flowing through the auxiliary winding.5. The rectifying circuit according to claim 4 , whereinthe connection coil includes a balancing coil having a midpoint tap connected to an output terminal for outputting an output voltage.6. The rectifying circuit according to claim 1 , whereinthe inductance section includes a connection coil not coupled to a primary winding of the transformer.7. The ...

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Номер записи: 30
07-01-2021 дата публикации

HYBRID SWITCHED-CAPACITOR CONVERTER

Номер: US20210006174A1
Автор: Rainer Christian, Rizzolatti Roberto, Wiedenbauer Otto
Принадлежит:

A power supply system comprises: a switched-capacitor converter, a transformer, and a voltage converter. The switched-capacitor converter includes multiple capacitors. The multiple capacitors are controllably switched in a circuit path including a primary winding of the transformer to convert the first voltage into a second voltage. The voltage converter converts the first voltage produced by the switched-capacitor converter into the second voltage that powers a load. 1. An apparatus comprising: a first resonant circuit path including a first capacitor and a primary winding of a transformer;', 'a second resonant circuit path including a second capacitor and the primary winding; and', 'the primary winding inductively coupled to a secondary winding of the transformer, the secondary winding operative to produce an output voltage to power a load., 'a controller operative to control switching of a power converter, the power converter comprising2. The apparatus as in claim 1 , wherein the secondary winding of the transformer is a tapped winding inductively coupled to the primary winding claim 1 , the secondary winding including a first secondary winding and a second secondary winding.3. The apparatus as in claim 2 , wherein a common node of the tapped winding couples a first node of the first secondary winding and a first node of the second secondary winding claim 2 , the common node operative to produce the output voltage.4. The apparatus as in claim 3 , wherein the controller is operative to switch between coupling a second node of the first secondary winding to a first voltage source and coupling a second node of the second secondary winding to the first voltage source.5. The apparatus as in claim 1 , wherein the power converter further comprises:first switches including a first switch and a second switch coupled to a first node of the first capacitor; andsecond switches including a third switch and a fourth switch coupled to a first node of the second capacitor.6. The ...

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Номер записи: 31
03-01-2019 дата публикации

Adaptive synchronous rectifier sensing deglitch

Номер: US20190006950A1
Автор: Hanguang Zhang, Hien Bui, Pengju Kong, Tao Li, Wenbo Liang
Принадлежит: Dialog Semiconductor Inc

A synchronous rectifier controller for controlling the on and off periods of a synchronous rectifier switch transistor in a switching power converter. In particular, the synchronous rectifier controller is configured to adaptively enable and disable a deglitch filter for filtering a turn-on signal for the synchronous rectifier switch transistor. In this fashion, the synchronous rectifier switch transistor may be switched on more rapidly during periods when the deglitch filter is disabled for greater efficiency yet the switching power converter is protected by the deglitch filter when it is not disabled.

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Номер записи: 32
02-01-2020 дата публикации

Electrical Circuit with Auxiliary Voltage Source for Zero-Voltage Switching in DC-DC Converter Under All Load Conditions

Номер: US20200007022A1
Автор: Johannes Voss, Rik W. De Doncker
Принадлежит: Rheinisch Westlische Technische Hochschuke RWTH

An electrical circuit comprising an n-port m-phase active bridge converter with n≥2 and m≥1, where each port can be operated as an input or an output port, wherein each of the n ports has m phase legs with multiple active switches with parallel connected snubber or resonant capacitors, whereby the n ports can convert a DC-voltage into an AC voltage, the n ports connected via an m-phase transformer or over m separate transformers each connected to each of the m phase legs of each of the n ports to transfer power between the ports, wherein an auxiliary circuit is connected to the transformers to convert a part of a transformer input voltage and energy via an auxiliary voltage source into a DC mid-point capacitor of a DC-link of at least one of the n-port m-phase active bridge converters to recharge the DC mid-point capacitor.

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Номер записи: 33
02-01-2020 дата публикации

Electrical Circuit for Zero-Voltage Soft-Switching in DC-DC Converter Under All Load Conditions

Номер: US20200007030A1
Автор: De Doncker Rik W.
Принадлежит:

An electrical circuit comprising an n-port m-phase active bridge converter with n≥2 and m≥3, where each port can be operated as an input or an output port, wherein each of the n ports has m phase legs with multiple active switches with parallel connected snubber or resonant capacitors, whereby the ports can convert a DC-voltage into an AC voltage and vice versa, whereby the ports are connected via a m-phase transformer or over m separate transformers each connected to each of the m phase legs of each of the m ports to transfer power between the ports, wherein an auxiliary circuit is connected to a star point of the transformers to feedback a fraction of a transformer input voltage and energy into a DC mid-point capacitor of a DC-link of at least one of the n-port m-phase active bridge converters to charge the DC mid-point capacitor. 1. An electrical circuit for zero-voltage switching of a DC-DC converter under all load conditions comprising an n-port m-phase active bridge converter with n≥2 and m≥3 , where each port can be operated as an input or an output port , wherein each of the n ports has m phase legs with multiple active switches with parallel connected snubber or resonant capacitors , wherein the ports can convert a DC-voltage into an AC voltage and vice versa , wherein the ports are connected via a m-phase transformer or over m separate transformers each connected to each of the m phase legs of each of the m ports to transfer power between the ports , and wherein an auxiliary circuit is connected to a star point of the transformers to feed back a fraction of a transformer input voltage and energy into a DC mid-point capacitor of a DC-link of at least one of the n-port m-phase active bridge converters in such a way that the DC mid-point capacitor is charged at its port with an offset voltage above and below the DC-link midpoint voltage enabling the auxiliary circuit to provide under all load conditions zero-voltage soft-switching operation of the switches of ...

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Номер записи: 34
02-01-2020 дата публикации

POWER CONVERTER WITH ACTIVE CLAMP

Номер: US20200007048A1
Автор: Radic Aleksandar
Принадлежит: Silanna Asia Pte Ltd

A power converter includes an input side to receive an input voltage, and an output side to provide an output voltage, a main switch, a controller, a transformer having a primary winding that couples the main switch to the input side, an active clamp switch coupled to the input side by an active clamp capacitor, and an active clamp controller circuit. The active clamp controller circuit includes a sampling circuit to generate a sampled main switch voltage, a delay circuit to generate a delayed sampled main switch voltage, a voltage comparison circuit, and an active clamp switch controller circuit configured to i) enable the active clamp switch based on a first comparison between the sampled main switch voltage and the delayed sampled main switch voltage, and ii) disable the active clamp switch based on a second comparison between the sampled main switch voltage and the delayed sampled main switch voltage. 1. An active clamp controller circuit comprising:a sampling circuit configured to receive a main switch voltage from a main switch of a power converter and configured to generate a sampled main switch voltage based on the main switch voltage;a delay circuit coupled to the sampling circuit to receive the sampled main switch voltage and configured to generate a delayed sampled main switch voltage;a first voltage comparison circuit coupled to the sampling circuit to receive the sampled main switch voltage and coupled to the delay circuit to receive the delayed sampled main switch voltage; andan active clamp switch controller circuit that includes the first voltage comparison circuit, the active clamp switch controller circuit being configured to i) enable an active clamp switch of the power converter based on a first comparison, by the first voltage comparison circuit, between the sampled main switch voltage and the delayed sampled main switch voltage, and ii) disable the active clamp switch based on a second comparison, by the first voltage comparison circuit, ...

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Номер записи: 35
02-01-2020 дата публикации

Gate Drivers and Voltage Regulators for Gallium Nitride Devices and Integrated Circuits

Номер: US20200007119A1
Автор: FU Yue, Li Zhanming, Liu Yan-Fei
Принадлежит:

Voltage stabilizing and voltage regulating circuits implemented in GaN HEMT technology provide stable output voltages suitable for use in applications such as GaN power transistor gate drivers and low voltage auxiliary power supplies for GaN integrated circuits. Gate driver and voltage regulator modules include at least one GaN D-mode HEMT (DHEMT) and at least two GaN E-mode HEMTs (EHEMTs) connected together in series, so that the at least one DHEMT operates as a variable resistor and the at least two EHEMTs operate as a Zener diode that limits the output voltage. The gate driver and voltage regulator modules may be implemented as a GaN integrated circuits, and may be monolithically integrated together with other components such as amplifiers and power HEMTs on a single die to provide a GaN HEMT power module IC. 1. A gate driver circuit for a gallium nitride (GaN) power transistor , comprising:an input point that receives an input voltage and an output point that outputs an output voltage to drive the GaN power transistor;a series circuit comprising at least one GaN D-mode HEMT (DHEMT) with gate-to-source connection and at least first to fourth GaN E-mode HEMTs (EHEMTs) each with drain-to-gate connection;an output EHEMT having a drain connected to the input point and a source connected to the output point;wherein a drain of the DHEMT is connected to the input point and a source of the DHEMT is connected to a drain of the first EHEMT and to a gate of the output EHEMT;wherein a source of the first EHEMT is connected to a drain of the second EHEMT, a source of the second EHEMT is connected to a drain of the third EHEMT, a source of the third EHEMT is connected to a drain of the fourth EHEMT, and a source of the fourth EHEMT is connected to a circuit common.2. The gate driver circuit of claim 1 , wherein the output EHEMT comprises a source follower amplifier.3. The gate driver circuit of claim 1 , further comprising an amplifier;wherein the output point is connected to ...

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Номер записи: 36
20-01-2022 дата публикации

SWITCHING POWER SUPPLY UNIT AND ELECTRIC POWER SUPPLY SYSTEM

Номер: US20220021312A1
Автор: HIROKAWA Masahiko, ISHIBASHI Naoyuki, Wu Xiaofeng
Принадлежит: TDK Corporation

A switching power supply unit includes: a transformer; an inverter circuit including first to fourth switching devices, first to third capacitors, first and second rectifying devices, a resonant inductor, and a resonant capacitor; and a driver. The first to fourth switching devices are coupled in series. The first and second capacitors are coupled in series. The first rectifying device is disposed between a first connection point between the first and second capacitors and a second connection point between the first and second switching devices. The second rectifying device is disposed between the first connection point and a third connection point between the third and fourth switching devices. The third capacitor is disposed between the second and third connection points. The resonant capacitor, the resonant inductor, and a primary winding are coupled in series between a fourth connection point between the second and third switching devices and the first connection point. 1. A switching power supply unit comprising:a pair of input terminals configured to receive an input voltage;a pair of output terminals configured to output an output voltage;a transformer including a primary winding and a secondary winding;an inverter circuit disposed between the pair of input terminals and the primary winding, and including first to fourth switching devices, first to third capacitors, first and second rectifying devices, a resonant inductor, and a resonant capacitor;a rectifying and smoothing circuit disposed between the pair of output terminals and the secondary winding, and including a rectifying circuit and a smoothing circuit, the rectifying circuit including two or more rectifying devices, the smoothing circuit including a fourth capacitor; anda driver configured to perform switching driving to control respective operations of the first to fourth switching devices in the inverter circuit, whereinthe first to fourth switching devices are coupled in series to each other in ...

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Номер записи: 37
12-01-2017 дата публикации

DC-DC CONVERTER, AND SOLAR POWER CONTROLLER AND MOBILE BODY USING SAME

Номер: US20170012546A1
Автор: IWATA Hiroshi, KOMIYA Kenji, NOMURA Masaru, Shibata Akihide, Shiomi Takeshi
Принадлежит: SHARP KABUSHIKI KAISHA

A DC-DC converter includes a transformer, a switching circuit provided on the primary side of the transformer, and a rectifier circuit provided on the secondary side of the transformer. The rectifier circuit includes a first rectifier part that is serially connected body of a first transistor and a second transistor having a first electrode connected to a second electrode of the first transistor. The first and second transistors each include a parasitic diode connected forward between the second and first electrode, and the withstanding voltage between the first and second electrodes of the first transistor is higher than the withstanding voltage between the first and second electrodes of the second transistor. 1. A DC-DC converter comprising:a transformer,a switching circuit disposed on a primary side of the transformer, anda rectification circuit disposed on a secondary side of the transformer, whereinthe rectification circuit includes a first rectification portion that is a series-connected body of a first transistor and a second transistor whose first electrode is connected to a second electrode of the first transistor,each of the first and second transistors has a parasitic diode that is connected in a forward direction between the second and first electrodes, anda withstand voltage between the first and second electrodes of the first transistor is higher than a withstand voltage between the first and second electrodes of the second transistor.2. The DC-DC converter according to claim 1 , whereinthe rectification circuit is a rectification bride circuit that includes:a second rectification portion that is a series-connected body of a third transistor and a fourth transistor whose first electrode is connected to a second electrode of the third transistor,a third rectification portion that is a series-connected body of a fifth transistor and a sixth transistor whose first electrode is connected to a second electrode of the fifth transistor,a fourth rectification ...

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Номер записи: 38
12-01-2017 дата публикации

Method and Apparatus for Obtaining Soft Switching in all the Switching elements through Current Shaping and Intelligent Control

Номер: US20170012547A1
Автор: Jitaru Ionel
Принадлежит: Rompower Energy Systems, Inc.

A method is shown to create soft transition in selected topologies by preserving the leakage inductance energy during the dead time and using several techniques to supplement the energy require to discharge the parasitic capacitance of the primary switchers and obtain zero voltage switching. One technique consists in a current pulse injection across the synchronous rectifiers during the dead time and prior the turn off of the synchronous rectifiers. A second technique consist in tailoring the magnetizing current through frequency modulation to increase the energy in the leakage inductance and use that energy to discharge the parasitic capacitance of the primary switchers and at lighter load to have a magnetizing current which exceeds the current through the output inductor at the end of the dead time. The third technique is interleaving two converters and sharing a couple inductance in a way to lower the current through each output inductor under the level of the magnetizing current at its lowest amplitude. The fourth technique is controlling the turn off timing of the primary switchers and turn on timing for the secondary synchronous rectifier and in this way to control the energy in the leakage inductance during the dead time in order to build enough energy in the leakage inductance to discharge the parasitic capacitances of the primary switchers to zero. In a given application we may use one or several of these technique function of the operating conditions. 1. A design and control method for a converter having a transformer and at least one output choke connected to two synchronized rectifiers wherein switching frequency of the converter is controlled in a such way that the current through the synchronous rectifiers becomes zero or slightly negative before the synchronized rectifiers are turn off2. The converter of wherein the current flowing into the drain of the synchronized rectifiers after the synchronized rectifiers turn off will further flow into the ...

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Номер записи: 39
12-01-2017 дата публикации

SWITCHING POWER SUPPLY CIRCUIT

Номер: US20170012548A1
Автор: ITOH Hiroshi, OKA Toshiyuki, SAKUNO KEIICHI
Принадлежит: SHARP KABUSHIKI KAISHA

In a switching power supply circuit (A) of the invention, a low-voltage node capacitor () is connected between a primary-side low-voltage stable potential node (LN) and a secondary-side low-voltage stable potential node (LN), and a high-voltage node capacitor () is connected between a primary-side high-voltage stable potential node (HN) and an anode of a rectifier element (). Thereby, it is possible to provide the switching power supply circuit which achieves, with a simple configuration, both of noise reduction and potential stabilization of stable potential nodes. 1. A switching power supply circuit , comprising: a transformer in which a primary side and a secondary side are insulated and separated and power is transmitted to the secondary side; a switching field effect transistor which performs switching of power in the primary side of the transformer; and a rectifier element which rectifies power in the secondary side of the transformer , whereinone end of a primary-side terminal of the transformer is connected to a primary-side high-voltage stable potential node,the other end of the primary-side terminal of the transformer is connected to a drain of the switching field effect transistor,a source of the switching field effect transistor is connected to a primary-side low-voltage stable potential node,one end of a secondary-side terminal of the transformer is connected to an anode of the rectifier element,a cathode of the rectifier element is connected to a secondary-side high-voltage stable potential node,the other end of the secondary-side terminal of the transformer is connected to a secondary-side low-voltage stable potential node,a low-voltage node capacitor is connected between the primary-side low-voltage stable potential node and the secondary-side low-voltage stable potential node, anda high-voltage node capacitor is connected between the primary-side high-voltage stable potential node and the anode of the rectifier element.2. The switching power supply ...

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Номер записи: 40
14-01-2016 дата публикации

A METHOD OF CONTROL FOR SYNCHRONOUS RECTIFIERS

Номер: US20160013714A1
Автор: Young George
Принадлежит:

The present application relates to the field of switching power supplies and in particular to switching power supplies in which a primary side is isolated from the secondary side and in which a synchronous rectifier on the secondary side is controlled from the primary side. The application provides a method for minimising body diode conduction losses. 1. A method of controlling a synchronous rectifier in a switching power supply that includes an inductive element , the method comprising:operating the synchronous rectifier to turn on at a first time position and to turn off at a second time position in a first switching cycle of the switching power supply;obtaining a first measurement from an auxiliary winding of the inductive element at a time position after the second time position; andadjusting the second time position in a second switching cycle subsequent to the first switching cycle based on a first value derived from the obtained measurement, wherein the first value is the obtained first measurement less a second value.2. The method according to claim 1 , wherein the operating of the synchronous rectifier to turn on at a first time position and to turn off at a second time position the first switching cycle comprises providing a switching pulse with turn on effected at a start of the pulse and turn off effected by an end of the pulse.3. The method according to claim 1 , wherein the operating of the synchronous rectifier to turn on at a first time position in the first switching cycle comprises providing a first pulse at the first time position claim 1 , and providing a second pulse to turn off the switch at the second time position.4. (canceled)5. The method according to claim 1 , wherein the second value is obtained by a second measurement from the auxiliary winding at a time position before the second time position.6. The method according to claim 1 , wherein the inductive element is a transformer and the second value is a value representative of an output ...

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Номер записи: 41
11-01-2018 дата публикации

STEP-DOWN POWER CONVERSION WITH ZERO CURRENT SWITCHING

Номер: US20180013351A1
Автор: Marawi Bassam
Принадлежит:

Methods, apparatuses, computer program products, and computer readable media are disclosed herein. In one aspect, an apparatus includes a first capacitor, a first inductor in resonance with the first capacitor, a first electronic switch and a second electronic switch. The first electronic switch may be configured to cause, when the first electronic switch is closed, the first capacitor to store a first energy, and to cause a second energy to be stored in magnetic fields of the inductor. The second energy may be transferred to a load during a resonant portion of an energy transfer cycle. The apparatus may further include a second electronic switch configured to cause the stored first energy in the first capacitor to be transferred at least in part to the magnetic fields of the inductor, and then transferred to the load during a buck portion of the energy transfer cycle. 1. An apparatus comprising:a first capacitor;a first inductor in resonance with the first capacitor;a first electronic switch configured to cause, when the first electronic switch is closed, the first capacitor to store a first energy, and to cause a second energy to be stored in magnetic fields of the inductor, wherein the second energy is then transferred to a load during a resonant portion of an energy transfer cycle; anda second electronic switch configured to cause the stored first energy in the first capacitor to be transferred at least in part to the magnetic fields of the inductor, and then transferred to the load during a buck portion of the energy transfer cycle.2. The apparatus as in claim 1 ,wherein the buck portion of the energy transfer cycle follows in time the resonant portion of the energy transfer cycle, wherein the resonant portion of the energy transfer cycle corresponds to the first switch being on and the second switch being off, wherein the buck portion of the energy transfer cycle corresponds to the first switch being off and the second switch being on, and wherein the resonant ...

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Номер записи: 42
11-01-2018 дата публикации

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

Номер: US20180013352A1
Автор: Cao Yaming, Fang Lieyi, Lin Yuan, Luo Qiang
Принадлежит:

System controller and method for regulating a power converter. For example, the system controller includes a first controller terminal and a second controller terminal. The system controller is configured to receive an input signal at the first controller terminal and generate a drive signal at the second controller terminal based at least in part on the input signal to turn on or off a transistor in order to affect a current associated with a secondary winding of the power converter. Additionally, the system controller is further configured to determine whether the input signal remains larger than a first threshold for a first time period that is equal to or longer than a first predetermined duration. 1. A system controller for regulating a power converter , the system controller comprising:a first controller terminal; anda second controller terminal; receive an input signal at the first controller terminal; and', 'generate a drive signal at the second controller terminal based at least in part on the input signal to turn on or off a transistor in order to affect a current associated with a secondary winding of the power converter;, 'wherein the system controller is configured to determine whether the input signal remains larger than a first threshold for a first time period that is equal to or longer than a first predetermined duration; and', 'in response to the input signal not being determined to remain larger than the first threshold for the first time period that is equal to or longer than the first predetermined duration, operate with a first mechanism;, 'wherein the system controller is further configured to determine whether the input signal remains smaller than a second threshold for a second time period that is equal to or longer than a second predetermined duration; and', 'in response to the input signal being determined to remain smaller than the second threshold for the second time period that is equal to or longer than the second predetermined ...

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Номер записи: 43
10-01-2019 дата публикации

POWER CONVERSION APPARATUS AND SYNCHRONOUS RECTIFICATION CIRCUIT THEREOF

Номер: US20190013727A1
Автор: Ke Po-Jen
Принадлежит: POWER FOREST TECHNOLOGY CORPORATION

A power conversion apparatus and a synchronous rectification (SR) circuit thereof are provided. The power conversion apparatus includes a transformer and the SR circuit. A primary winding of the transformer receives an input voltage. A secondary winding of the transformer provides an output voltage to an output terminal. The SR circuit includes a SR transistor and a SR controller. The SR transistor is coupled between the secondary winding and the output terminal and controlled by a control signal. The SR controller is coupled to the SR transistor to receive a first detecting signal, and generates the control signal according to the first detecting signal. When the SR controller detects that the SR circuit is abnormal, the SR controller generates the controller signal to keep the SR transistor at an on state so as to perform an abnormal protection on the SR circuit. 1. A power conversion apparatus , comprising:a transformer, comprising a primary winding and a secondary winding, wherein the primary winding receives an input voltage, and the secondary winding provides an output voltage to an output terminal; and a synchronous rectification transistor, coupled between the secondary winding and the output terminal and controlled by a control signal; and', 'a synchronous rectification controller, coupled to the synchronous rectification transistor to receive a first detecting signal, and generating the control signal according to the first detecting signal so as to turn on/off the synchronous rectification transistor,, 'a synchronous rectification circuit, comprisingwherein when the synchronous rectification controller detects that an abnormal event occurs on the synchronous rectification circuit, the synchronous rectification controller generates the control signal to keep the synchronous rectification transistor in an on state so as to perform abnormal protection on the synchronous rectification circuit, an anomaly detecting circuit, receiving an external detecting ...

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Номер записи: 44
10-01-2019 дата публикации

Systems and methods of active clamp flyback power converters

Номер: US20190013739A1
Автор: Ajay Karthik Hari, Bryan Wayne McCoy
Принадлежит: Semiconductor Components Industries LLC

Active clamp flyback power converter. At least some of the example embodiments are methods including: activating a main FET and thereby inducing positive current flow in a primary winding, the positive current flow resulting in reverse biasing of a rectifier of a secondary circuit; deactivating the main FET and thereby forward biasing the rectifier in the secondary circuit and causing current flow in the secondary winding; activating a clamp FET and thereby coupling a clamp capacitor to a leakage inductance of a transformer, the primary circuit having initially a positive current flow through the primary winding and then a negative current flow through the primary winding; and regulating the negative current flow through the primary winding.

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Номер записи: 45
14-01-2021 дата публикации

Amplifier Circuit and Method for Operating an Amplifier Circuit

Номер: US20210013848A1
Автор: Christoph Waldmeier
Принадлежит: SIEMENS SCHWEIZ AG

An amplifier circuit acting as a line driver in a line between a central station and field devices connected thereto comprising: a DC/DC converter integrated in the circuit as a power stage comprising a DC/pulse converter with two electrically isolated switching stages; a logic block preceding the converter, generating control signals for the switches from a PWM signal and feeding them into the converter in an electrically isolated manner using drivers; a priority block generating the PWM signal; a first and a second controller. The priority block forwards output from the first or second controller. The first controller generates a fault signal based on a voltage limit and an output voltage fed back within the amplifier circuit via a feedback path. The second controller generates a fault signal based on a current limit and the output current. The central station defines the current limit and the voltage limit.

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Номер записи: 46
09-01-2020 дата публикации

IMPROVEMENTS IN OR RELATING TO GATE DRIVERS FOR GAS TUBES

Номер: US20200014292A1
Автор: Davidson Colin Charnock
Принадлежит:

In the field of gate drivers there is provided a regulated voltage source (A, B), for a gate driver () of a switching device () having a gate terminal () via which the switching device () can at least be turned on. The regulated voltage source (A, B) comprises an input terminal () via which the regulated voltage source (A, B) in use receives current. The regulated voltage source (A, B) also includes first and second connection terminals () via at least one of which the regulated voltage source (A, B) in use applies a voltage (V) to a gate terminal () of a switching device (). In addition the regulated voltage source (A, B) includes a regulated energy storage stage () which is electrically connected between the input and output terminals () and which includes a primary energy storage device (A, B) connected in parallel with a storage limiter () to limit the amount of energy stored in the primary energy storage device (A, B). Between the primary energy storage device (A, B) and the storage limiter () lies an energy retainer () to prevent the escape of energy from the primary energy storage device (A, B) via the storage limiter (). The regulated voltage source (A, B) further includes a freewheel diode () that is arranged in parallel with the energy storage stage () and a secondary energy storage device (A, B) which is arranged in parallel with each of the freewheel diode () and the energy storage stage (). 112-. (canceled)13. A regulated voltage source for a gate driver of a switching device having a gate terminal via which the switching device can at least be turned on , the regulated voltage source comprising:an input terminal via which the regulated voltage source in use receives current;first and second connection terminals via at least one of which the regulated voltage source in use applies a voltage to a gate terminal of a switching device;a regulated energy storage stage electrically connected between the input and output terminals and including a primary ...

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Номер записи: 47
21-01-2016 дата публикации

AN INTEGRATED DUAL-OUTPUT GRID-TO-VEHICLE (G2V) AND VEHICLE-TO-GRID (V2G) ONBOARD CHARGER FOR PLUG-IN ELECTRIC VEHICLES

Номер: US20160016479A1
Автор: Khaligh Alireza, Tang Yichao
Принадлежит: University of Maryland

An integrated and isolated onboard charger for plug-in electric vehicles, includes an ac-dc converter and a dual-output dc-dc resonant converter, for both HV traction batteries and LV loads. In addition, the integrated and isolated onboard charger may be configured as unidirectional or bidirectional, and is capable of delivering power from HV traction batteries to the grid for vehicle-to-grid (V2G) applications. To increase the power density of the converter, the dual-output DC-DC resonant converter may combine magnetic components of resonant networks into a single three-winding electromagnetically integrated transformer (EMIT). The resonant converter may be configured as a half-bridge topology with split capacitors as the resonant network components to further reduce the size of converter. The integrated charger may be configured for various operating modes, including grid to vehicle (G2V), vehicle to grid (V2G) and high voltage to low voltage, HV-to-LV (H2L) charging.

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Номер записи: 48
21-01-2016 дата публикации

Switching synchronization for isolated electronics topologies

Номер: US20160020702A1
Автор: James Benson Bacque, Olivier Trescases, Raymond Kenneth Orr, Shahab Poshtkouhi
Принадлежит: SOLANTRO SEMICONDUCTOR CORP

One or more first switches coupled to one of a primary transformer winding and a secondary transformer winding are controlled based on a first switch control reference clock signal. A reflected voltage across the other of the primary and secondary windings is sensed, and a second switch control reference clock signal is synchronized to the first switch control reference clock signal based on the reflected voltage. One or more second switches coupled to the other of the primary and secondary windings are controlled based on the second switch control reference clock signal. A digital isolator could instead be used to transfer a switch control reference signal across an isolation boundary. Switch control signals for controlling a set of switches on one side of the isolation boundary may be derived from a switch control reference signal that is synchronized with the transferred switch control reference clock signal.

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Номер записи: 49
21-01-2016 дата публикации

SYNCHRONOUS RECTIFICATION FOR FLYBACK CONVERTER

Номер: US20160020703A1
Автор: Gong Xiaowu
Принадлежит:

A flyback converter is described that includes a synchronous rectification integrated circuit (SRIC). The SRIC is configured to determine an actual turn-on time associated with a secondary switching element during an initial switching cycle and determine an error time that defines approximately a difference between the actual turn-on time and a predicted turn-on time associated with the secondary switching element. The predicted turn-on time defines approximately an amount of time to delay switching-off the secondary switching element after initially switching-on the secondary switching element, during an initial switching cycle of the secondary switching element. During a subsequent switching cycle of the secondary switching element, the SRIC is further configured to delay switching-off the secondary switching element for a period of time approximately equal to the predicted turn-on time and the error time. After delaying switching-off the secondary switching element the SRIC is configured to switch-off the secondary switching element.

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Номер записи: 50
03-02-2022 дата публикации

Power converting device

Номер: US20220037995A1
Автор: Yutaka Usami
Принадлежит: Toshiba TEC Corp

A power converting device includes a totem pole type power factor improving circuit and a control circuit. The totem pole type power factor improving circuit includes a coil connected to a first terminal of an AC power supply, a first half-wave switch in which a source terminal is connected to the coil via a first current detector, a second half-wave switch in which a drain terminal is connected to the coil via a second current detector, a first diode in which a cathode is connected to a drain terminal of the first half-wave switch and an anode is connected to a second terminal of the AC power supply, a second diode in which an anode is connected to a source terminal of the second half-wave switch and a cathode is connected to the second terminal of the AC power supply, and a smoothing capacitor connected between the cathode of the first diode and the anode of the second diode. The control circuit controls the pulse width to turn on or off the first half-wave switch and the second half-wave switch based on a total value of a result of detecting the DC voltage of the first current detector and a result of detecting the DC voltage of the second current detector.

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Номер записи: 51
03-02-2022 дата публикации

ISOLATED POWER CONVERTER AND DATA TRANSMISSION METHOD

Номер: US20220038017A1
Автор: Li Xinlei, Zhang Qiao
Принадлежит:

An isolated power converter can include: a primary side having a primary winding and a primary power transistor; a secondary side having a secondary winding and a secondary power transistor; a secondary control circuit configured to change a voltage across the secondary winding to change a voltage across the primary winding during a period when both the primary power transistor and the secondary power transistor are in a turn-off state; and a primary control circuit configured to control switching states of the primary power transistor, such that an output signal of the isolated power converter matches an output demand. 1. An isolated power converter , comprising:a) a primary side having a primary winding and a primary power transistor;b) a secondary side having a secondary winding and a secondary power transistor;c) a secondary control circuit configured to change a voltage across the secondary winding to change a voltage across the primary winding during a period when both the primary power transistor and the secondary power transistor are in a turn-off state; andd) a primary control circuit configured to control switching states of the primary power transistor, such that an output signal of the isolated power converter matches an output demand.2. The isolated power converter of claim 1 , wherein the secondary control circuit is configured to change the voltage across the secondary winding by turning on the secondary power transistor at different time periods claim 1 , thereby transmitting different types of data to the primary control circuit claim 1 , wherein the data is associated with the output demand.3. The isolated power converter of claim 2 , wherein the secondary control circuit is configured to control the secondary power transistor to be turned on at least once during the different time periods and to maintain a turn-on state of the secondary power transistor for a first time claim 2 , in order to change the voltage across the secondary winding.4. The ...

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Номер записи: 52
03-02-2022 дата публикации

CONVERTER MODULE WITH PHASE SHIFT

Номер: US20220038018A1
Автор: BOSQUE MONCUSI Josep Maria, Marcos Pastor Adria, Martinez Perez Antonio, RODA CORNEJO Luis, SABORIDO RODRIGUEZ Victor
Принадлежит: LEAR CORPORATION

A converter module is provided with a first power delivery circuit, a second power delivery circuit, and a controller. The first power delivery circuit supplies current from a first direct current (DC) source to a resonant stage in a first direction. The first power delivery circuit comprises at least two first switches. The second power delivery circuit supplies the current from the first DC source to the resonant stage in a second direction, opposite the first direction. The controller includes memory, and a processor that is programmed to: enable the first power delivery circuit and the second power delivery circuit alternately to provide power as a periodic waveform to the resonant stage; and disable the at least two first switches individually in a sequence to generate a phase shift in the periodic waveform and to disable the first power delivery circuit. 1. A converter module comprising:a first power delivery circuit to supply current from a first direct current (DC) source to a resonant stage in a first direction, the first power delivery circuit comprising at least two first switches;a second power delivery circuit to supply the current from the first DC source to the resonant stage in a second direction, opposite the first direction; and enable the first power delivery circuit and the second power delivery circuit alternately to provide power as a periodic waveform to the resonant stage; and', 'disable the at least two first switches individually in a sequence to generate a phase shift in the periodic waveform and to disable the first power delivery circuit., 'a controller including memory, and a processor programmed to2. The converter module of wherein the phase shift of the periodic waveform comprises a constant voltage segment between two edge portions extending between a maximum voltage and a minimum voltage.3. The converter module of wherein the constant voltage segment is approximately equal to zero volts.4. The converter module of claim 1 , wherein ...

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Номер записи: 53
03-02-2022 дата публикации

SYSTEM AND METHOD FOR ENHANCED SINGLE-STAGE ON-BOARD CHARGER WITH INTEGRATED RECTIFIER

Номер: US20220038019A1
Автор: GAONA ROSANES Pablo, JIMENEZ PINO Rafael, Lucia Gil Oscar, SARNAGO ANDIA Hector
Принадлежит:

In at least one embodiment, a vehicle battery charger is provided. At least one transformer includes a first winding and a second winding on a primary side of the transformer that are connected to one another to form a middle point. The middle point of the at least one transformer receives an input voltage signal from a mains supply. A half-bridge rectifier receives the input voltage signal from the mains supply to enable the middle point of the least one transformer to receive the input voltage signal from the mains supply. A first active bridge includes a first plurality of switching devices to receive a first input signal directly from the first winding and to receive a second input signal directly from the second winding. The first input signal and the second input signal are out of phase with one another to minimize electromagnetic interference within the vehicle battery charger. 1. A vehicle battery charger comprising:at least one transformer having a first winding and a second winding on a primary side of the at least one transformer that are connected to one another to form a middle point, the middle point of the at least one transformer for receiving an input voltage signal from a mains supply;a half-bridge rectifier for receiving the input voltage signal from the mains supply to enable the middle point of the at least one transformer to receive the input voltage signal from the mains supply; anda first active bridge including a first plurality of switching devices to receive a first input signal directly from the first winding and to receive a second input signal directly from the second winding, wherein the first input signal and the second input signal are out of phase with one another to reduce electromagnetic interference (EMI) within the vehicle battery charger.2. The vehicle battery charger of claim 1 , wherein the first input signal and the second input signal are 180 degrees out of phase from one another.3. The vehicle battery charge of claim 1 , ...

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Номер записи: 54
03-02-2022 дата публикации

ZERO-VOLTAGE-SWITCHING FLYBACK CONVERTER WITH REDUCED SECONDARY SIDE CURRENT AND VOLTAGE STRESS

Номер: US20220038020A1
Автор: GUO Huaming, LAI Yongcai, LUO Zhaowu, Xu Yi, Yao Jianming
Принадлежит:

A flyback converter is provided in which either auxiliary winding or the primary winding is split into two windings. In this fashion, a different turn ratio is presented to the secondary winding during the transformer reset period as compared to when an active-clamp transistor or a ZVS switch transistor is switched on. 1. A zero-voltage switching (ZVS) flyback converter , comprising:a transformer having a primary winding, a secondary winding, a first auxiliary winding, and a second auxiliary winding;an SR switch transistor in series with the secondary winding;a first diode;an auxiliary capacitor in series with the first auxiliary winding and the first diode, wherein the first diode is configured to allow a charging current to flow from a positive terminal of the first auxiliary winding into a positive terminal of the auxiliary capacitor and to prevent a current flow into the positive terminal of the first auxiliary winding;a second diode; anda ZVS switch transistor in series with the second auxiliary winding and the second diode, wherein the second diode is configured to allow a discharging current to flow from the positive terminal of the auxiliary capacitor through the second auxiliary winding while the ZVS switch transistor is on and to prevent a current flow through the second auxiliary winding while the charging current is conducting.2. The ZVS flyback converter of claim 1 , wherein the ZVS switch transistor is an NMOS switch transistor.3. The ZVS flyback converter of claim 1 , wherein the ZVS switch transistor is PMOS switch transistor.4. The ZVS flyback converter of claim 1 , further comprising:a power switch transistor coupled to the primary winding; anda primary-side controller for switching on the ZVS switch transistor during a DCM mode of operation after the power switch transistor has cycled off and before the SR switch transistor has cycled on to cause a voltage across the power switch transistor to discharge toward zero volts.5. The ZVS flyback ...

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Номер записи: 55
03-02-2022 дата публикации

ADAPTIVE HYSTERETIC CONTROL FOR A POWER CONVERTER

Номер: US20220038079A1
Автор: Banerjee Suvadip, Barot Kashyap Jayendra, Nasum Sreeram Subramanyam
Принадлежит:

An apparatus includes a first control circuit having an output and including a first comparator and a second control circuit coupled to the output of the first control circuit. The second control circuit includes a second comparator configured to: compare a first value to a reference frequency value, the first value indicating a frequency of a signal at the output of the first control circuit; and provide an adjustment value to change a hysteresis window of the first comparator. 1. An apparatus comprising:a first control circuit having an output and including a first comparator; and compare a first value to a reference frequency value, the first value indicating a frequency of a signal at the output of the first control circuit; and', 'provide an adjustment value to change a hysteresis window of the first comparator., 'a second control circuit coupled to the output of the first control circuit, the second control circuit including a second comparator configured to2. The apparatus of claim 1 , wherein the first control circuit further includes an adjustable resistor coupled to a comparator output of the second comparator.3. The apparatus of claim 2 , wherein the adjustable resistor is a first resistor claim 2 , and the first control circuit further includes:first and second switches, each having respective first and second switch terminals and a respective control terminal, the respective second switch terminals coupled to an input of the first comparator, the respective control terminals coupled to the output of the first control circuit; andsecond and third resistors, the first resistor coupled between the second and third resistors, the first resistor having first and second resistor terminals, the first resistor terminal coupled to the first terminal of the first switch, and the second resistor terminal coupled to the first terminal of the second switch.4. The apparatus of claim 3 , wherein the first control circuit further includes a filter circuit having a ...

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Номер записи: 56
18-01-2018 дата публикации

ELECTRIC POWER CONVERSION DEVICE

Номер: US20180019663A1
Автор: Fukumasu Keisuke, Funato Hiroki, SOBU Yuji
Принадлежит: Hitachi Automotive Systems, Ltd.

An electric power conversion device includes: an active circuit section emitting noises; an output-side filter circuit section; a chassis including a first space and a second space for housing the active circuit section and the filter circuit section respectively; and a base plate that is installed so as to cover at least the first space and is electrically connected to the chassis. Here, the chassis includes a first partition wall for partitioning the first space and the second space, the base plate is disposed so as to cover the first space, and includes a second partition wall along the first partition wall, and the second partition wall is disposed between the filter circuit section and the first partition wall in the first space. 1. An electric power conversion device comprising:an active circuit section emitting noises;an output-side filter circuit section;a chassis including a first space and a second space for housing the active circuit section and the filter circuit section respectively; anda base plate that is installed so as to cover at least the first space and is electrically connected to the chassis,wherein the chassis includes a first partition wall for partitioning the first space and the second space,the base plate is disposed so as to cover the first space, and includes a second partition wall along the first partition wall, andthe second partition wall is disposed between the filter circuit section and the first partition wall in the first space.2. The electric power conversion device according to claim 1 ,wherein the first partition wall is integrally molded with the chassis, andthe second partition wall is integrally molded with the base plate.3. The electric power conversion device according to claim 2 ,wherein the base plate is fastened to the upper surface of the first partition wall with a fastening member.4. The electric power conversion device according to claim 3 ,wherein a fastening protrusion, to which the base plate is fastened in ...

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Номер записи: 57
18-01-2018 дата публикации

Soft Switching Auxiliary Circuit, Three-Level Three-Phase Zero-Voltage Conversion Circuit

Номер: US20180019676A1
Автор: BING Yang, HUANG HAI, XU Fubin
Принадлежит: Emerson Network Power Co., Ltd.

The present invention discloses a soft switching auxiliary circuit, comprising: an auxiliary coupling inductor configured to receive currents from a respective branch of a main circuit connected to the soft switching auxiliary circuit and perform a current sharing outputting; a clamping diode configured to receive an inductive voltage from the auxiliary coupling inductor and feed the inductive voltage back to a main switch transistor of the main circuit; an auxiliary switch transistor configured to receive a current from the main switch transistor of the main circuit and output the current to the clamping diode. The present invention further discloses a three-level three-phase zero-voltage conversion circuit. By means of the present invention, it is possible to reduce hard switching loss, to improve system switching frequency, to improve efficiency and to reduce electromagnetic interference. 1. A soft switching auxiliary circuit , characterized by comprising:an auxiliary coupling inductor configured to receive currents from a respective branch of a main circuit connected to the soft switching auxiliary circuit and perform a current sharing outputting;a clamping diode configured to receive an inductive voltage from the auxiliary coupling inductor and feed the inductive voltage back to a main switch transistor of the main circuit;an auxiliary switch transistor configured to receive a current from the main switch transistor of the main circuit and output the current to the clamping diode.2. The soft switching auxiliary circuit according to claim 1 , characterized by further comprising:a freewheeling diode configured to receive the inductive voltage from the auxiliary coupling inductor and output the inductive voltage to the main switch transistor of the main circuit.3. A soft switching auxiliary circuit claim 1 , characterized in that: the soft switching auxiliary circuit is connected in parallel with a main switch transistor of a main circuit claim 1 , and the soft ...

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Номер записи: 58
17-01-2019 дата публикации

RESONANT POWER CONVERTER WITH DEAD-TIME CONTROL OF SYNCHRONOUS RECTIFICATION CIRCUIT

Номер: US20190020269A1
Автор: Andersen Michael Andreas Esbern, Ekhtiari Marzieh, Zsurzsan Tiberiu-Gabriel
Принадлежит:

A resonant power converter including a synchronous rectifier for supplying a DC output voltage. The synchronous rectifier is configured for alternatingly connecting a resonant output voltage to positive and negative DC output nodes via first and second semiconductor switches, respectively, separated by intervening dead-time periods in accordance with first and second rectification control signals. A dead-time controller is coupled to the resonant output voltage or the resonant input voltage and configured for adaptively adjusting lengths of the dead-time periods via the first and second rectification control signals. 1. A resonant power converter comprising:a first power supply rail for receipt of a positive DC supply voltage and a second power supply rail for receipt of a negative DC supply voltage,a resonant network comprising an input section for receipt of a resonant input voltage and an output section for supplying a resonant output voltage generated in response to the resonant input voltage,an input driver configured for supplying the resonant input voltage;a synchronous rectifier comprising:a rectifier input coupled to the resonant output voltage,first and second semiconductor switches controlled by first and second rectification control signals, wherein the synchronous rectifier is configured for alternatingly connecting the resonant output voltage to positive and negative DC output nodes via the first and second semiconductor switches, respectively, separated by intervening dead-time periods in accordance with the first and second rectification control signals;a first dead-time controller coupled to the resonant output voltage or to the resonant input voltage and configured for adaptively adjusting lengths of the dead-time periods via the first and second rectification control signals.2. A resonant power converter according to claim 1 , wherein the input driver comprises third and fourth semiconductor switches controlled by first and second driver control ...

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Номер записи: 59
17-01-2019 дата публикации

CONTROL CIRCUIT FOR SYNCHRONOUS RECTIFIER AND THE METHOD THEREOF

Номер: US20190020282A1
Автор: FENG Lin, Li Hui, Miao Lei, Wang Siran
Принадлежит:

A synchronous switching converter with an energy storage component and a synchronous rectifier coupled to the energy storage component, having: a secondary control circuit configured to receive a slew rate threshold adjusting signal and a voltage across the synchronous rectifier, and to provide a secondary control signal; wherein the secondary control circuit detects a slew rate of the voltage across the synchronous rectifier, and maintains the synchronous rectifier being off when the slew rate of the voltage across the synchronous rectifier is lower than a slew rate threshold. 1. A synchronous switching converter with an energy storage component and a synchronous rectifier coupled to the energy storage component , comprising:a secondary control circuit having a first input terminal configured to receive a slew rate threshold adjusting signal, a second input terminal configured to receive a voltage across the synchronous rectifier, and an output terminal configured to provide a secondary control signal based on the slew rate threshold adjusting signal and the voltage across the synchronous rectifier to control the synchronous rectifier; andwherein the secondary control circuit detects a slew rate of the voltage across the synchronous rectifier, and maintains the synchronous rectifier being off when the slew rate of the voltage across the synchronous rectifier is lower than a slew rate threshold.2. The synchronous switching converter of claim 1 , further comprising a secondary control chip claim 1 , wherein the secondary control circuit is integrated in the secondary control chip claim 1 , and the secondary control chip has a slew rate threshold adjusting pin configured to couple the first input terminal of the secondary control circuit to an off-chip component.3. The synchronous switching converter of claim 1 , wherein the secondary control circuit comprises:an on control circuit having a first input terminal configured to receive the voltage across the synchronous ...

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Номер записи: 60
17-01-2019 дата публикации

AUTOMATIC CONTROL OF SYNCHRONOUS RECTIFIER TURN-OFF THRESHOLD

Номер: US20190020283A1
Автор: CHEN Cheng-Sung, Choi Hangseok, CHUNG Chi Chen, MOON SangCheol
Принадлежит: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC

A Synchronous Rectifier (SR) controller circuit includes a dead time evaluation circuit, an offset voltage controller circuit, an off threshold control circuit, and a comparator circuit. The dead time evaluation circuit produces an indication of whether a measured dead time of an SR switching device is less than a target dead time. The offset voltage controller circuit determines an offset count using the indication, an offset voltage using the offset count, and high and low saturation indicators according to the offset count. The off threshold control circuit determines a threshold count using the high and low saturation indicators and an off threshold voltage using the threshold count. The comparator circuit determines whether a measured voltage of the SR switching device is greater than a virtual off threshold voltage, the virtual off threshold voltage corresponding to the off threshold voltage minus the offset voltage. 1. A controller circuit for controlling a switching device , the controller circuit comprising:a gate signal for controlling the switching device; anda dead time evaluation circuit to determine an up indication indicating whether a measured dead time of the switching device is less than a target dead time,wherein the controller circuit determines to turn off the switching device by compensating for a voltage difference caused by a stray inductance by controlling a virtual off threshold voltage according to whether the measured dead time of the switching device is less than the target dead time.2. The controller circuit of claim 1 , further comprising:an offset voltage control circuit to determine, using the up indication, an offset voltage; andan off threshold control circuit to determine an off threshold voltage,wherein the virtual off threshold voltage corresponds to a difference between the offset voltage and the off threshold voltage.3. The controller circuit of claim 2 , further comprising:a summing circuit to produce a sum signal ...

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Номер записи: 61
22-01-2015 дата публикации

SWITCHING POWER SUPPLY DEVICE

Номер: US20150023062A1
Автор: ENDO Naoto, HYUGAJI Takumi
Принадлежит: MITSUMI ELECTRIC CO., LTD.

In a switching power supply device having low loss in synchronous rectifying switches, exhibiting high power efficiency, and not causing troubles by reverse current in the switches. A secondary control circuit includes a reference voltage circuit to generate a reference voltage having a predetermined potential, and an ON-timing detector circuit to detect an ON timing of a synchronous rectifying switch through monitoring of a terminal voltage of the switch, an OFF-timing detector circuit to detect an OFF timing of the switch, and a timer circuit to be turned on at the ON timing and measure a predetermined period. The threshold voltage consisting of the reference voltage generated by the reference voltage circuit and an offset voltage is applied to the OFF-timing detector circuit during the measurement of the timer circuit, and the threshold voltage consisting of the reference voltage is applied to the OFF-timing detector circuit during the non-measurement. 1. A switching power supply device comprising:a transformer for power conversion;at least one main switching element connected in series to a primary coil of the transformer;a primary control circuit to turn on or off the main switching element;a synchronous rectifying switching element connected in series to a secondary coil of the transformer; anda secondary control circuit to turn on or off the synchronous rectifying switching element, an ON-timing detector circuit to detect an ON timing of the synchronous rectifying switching element through monitoring of a terminal voltage of the synchronous rectifying switching element, and', a voltage obtained by adding a predetermined offset voltage to a reference voltage is applied as the threshold voltage to the OFF-timing detector circuit, before elapse of a predetermined period since activation of the synchronous rectifying switching element, and', 'the reference voltage is applied as the threshold voltage to the OFF-timing detector circuit, after the elapse of the ...

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Номер записи: 62
16-01-2020 дата публикации

Power conversion device

Номер: US20200021201A1
Автор: Kazuki Sakata
Принадлежит: Mitsubishi Electric Corp

The power conversion device in which a transformer, a first rectifier element, a second rectifier element, a smoothing coil, and a smoothing capacitor are placed on a base, the transformer including a secondary winding including a first secondary winding and a second secondary winding, and an intermediate terminal at which to connect the secondary winding and the base, the smoothing coil including a smoothing coil first terminal and a smoothing coil second terminal, the smoothing capacitor being connected to the smoothing coil second terminal and the intermediate terminal, another end side of the first secondary winding and another end side of the second secondary winding being connected to each other at a connection portion, the connection portion being located between the first terminal and the second terminal, and the first terminal or the second terminal being located between the intermediate terminal and the connection portion.

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Номер записи: 63
21-01-2021 дата публикации

Very High Efficiency Soft Switching Converter Aka The Adjud Converter

Номер: US20210021200A1
Автор: Jitaru Ionel
Принадлежит: Rompower Technology Holdings LLC

A half bridge switching cell includes two primary switching elements and a transformer with primary and secondary windings. Synchronized rectifiers correspond to the primary switching elements such that each of the synchronized rectifiers conducts when the corresponding primary switching element is not conducting. Each secondary winding is connected to one of the synchronous rectifiers and to a common connection and controlled current source. The primary switching elements conduct during offset times separated by a dead time. A magnetizing current flows through the secondary windings and synchronous rectifiers during the dead time. The magnetizing current flows into the primary winding when each of the synchronous rectifiers is turned off after the dead time, discharging a parasitic capacitance across the one of the primary switching elements when the corresponding synchronous rectifier is turned off, thereby creating a zero voltage switching condition at turn on for the primary switching elements. 1. A half bridge switching cell comprising:two primary switching elements connected in totem pole, across an input voltage source, wherein a connection common to the primary switching elements is defined as a primary switching node;a transformer having a primary winding in series with a capacitor, connected between the primary switching node and the input voltage source, and two secondary windings each having first and second ends;two synchronous rectifiers, defined as main synchronous rectifiers, each having a source and a drain, and each corresponding to a respective one of the primary switching elements such that each of the main synchronous rectifiers conducts when the respective one of primary switching elements is not conducting;wherein the first end of each secondary winding is connected to the drain of a respective one of the main synchronous rectifiers, and the second ends of the secondary windings are connected to a common connection, defined as a secondary ...

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Номер записи: 64
21-01-2021 дата публикации

Flyback converter with edge-based isolated communication

Номер: US20210021201A1
Автор: Kun Yang, Laiqing Ping, Wenduo Liu
Принадлежит: Dialog Semiconductor Inc

A flyback converter communication channel is provided that comprises a pair of capacitors. A transmitter on a first side of a transformer for the flyback converter transmits a transmitter signal over a first one of the capacitors. The transmitter also transmits a complement of the transmitter signal over a second one of the capacitors. A receiver on a second side of the transformer controls a switch transistor responsive to a high-pass-filtered difference of the received signals from the pair of capacitors.

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Номер записи: 65
26-01-2017 дата публикации

CIRCUITS AND METHODS FOR SYNCHRONOUS RECTIFICATION IN RESONANT CONVERTERS

Номер: US20170025965A1
Автор: LEVY Yehuda Daniel, Ramabhadran Ramanujam, She Xu
Принадлежит:

A resonant converter includes a primary stage having first and second switches coupled in series, a controller coupled to the first switch and the second switch to control operation thereof, a first transformer comprising a primary coil coupled to a node between the first and second switches, and a resonant inductor coupled to the primary coil of the first transformer. The resonant converter also includes a secondary stage having a second transformer formed of a primary coil coupled to the resonant inductor and a secondary coil comprising first and second coil sections, a third switch coupled to the first coil section of the secondary coil, and a fourth switch coupled to the second coil section of the secondary coil. A switch drive circuit is provided to drive the third and fourth switches for synchronous rectification, with the switch drive circuit comprising a secondary coil of the first transformer. 1. A resonant converter comprising: a first switch;', 'a second switch coupled in series with the first switch;', 'a controller coupled to the first switch and the second switch and programmed to control operation of the first switch and the second switch;', 'a first transformer comprising a primary coil coupled to a node between the first switch and the second switch; and', 'a resonant inductor coupled to the primary coil of the first transformer;, 'a resonant converter primary stage including [ a primary coil coupled to the resonant inductor; and', 'a secondary coil comprising a first coil section and a second coil section coupled to the first coil section;, 'a second transformer comprising, 'a third switch coupled to the first coil section of the secondary coil of the second transformer; and', 'a fourth switch coupled to the second coil section of the secondary coil of the second transformer; and, 'a resonant converter secondary stage includinga switch drive circuit configured to drive the third switch and the fourth switch for synchronous rectification, wherein ...

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Номер записи: 66
26-01-2017 дата публикации

POWER CONVERTER AND CONTROL METHOD THEREFOR

Номер: US20170025966A1
Автор: CHANG YUNG-I, HUANG Kuo-Hsien
Принадлежит: Fairchild (Taiwan) Corporation

A power converter and a control method therefor are provided. The power converter includes a transformer, synchronous rectifier and a control circuit. A primary side of the transformer receives an input voltage, and a secondary side of the transformer generates a sensing signal. The synchronous rectifier is coupled to the secondary side of the transformer. The control circuit receives the sensing signal and detects a changing slope of the sensing signal, and accordingly generates a control signal to control the synchronous rectifier to be turned on or turned off, so as to regulate an output voltage of the power converter. 1. A power converter , comprising:a transformer, having a primary side receiving an input voltage an a secondary side generating a sensing signal;a synchronous rectifier, coupled to the secondary side of the transformer; anda control circuit, coupled to the secondary side of the transformer and the synchronous rectifier, receiving the sensing signal, detecting a changing slope of the sensing signal and generating a control signal to control the synchronous rectifier to be turned off, so as to regulate an output voltage of the power converter.2. The power converter according to claim 1 , wherein the sensing signal comprises a sensing current claim 1 , and during a discharge period of the secondary side of the transformer claim 1 , the control circuit calculate the changing slope of the sensing current respectively according to the sensing current at a first time point claim 1 , the sensing current at a second time point claim 1 , and a time difference between the first time point and the second time point claim 1 , so as to turn off the synchronous rectifier when a secondary side current of the transformer reaches a zero-crossing point.3. The power converter according to claim 1 , wherein the sensing signal comprises a sensing voltage claim 1 , and during a discharge period of the secondary side of the transformer claim 1 , the control circuit ...

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Номер записи: 67
25-01-2018 дата публикации

Integrated Copper Bar for Secondary Power Circuit of Power Electronic Converter

Номер: US20180025834A1
Автор: FU Dengmeng, Gao Zhe
Принадлежит: UNITED AUTOMOTIVE ELECTRONIC SYSTEMS CO. LTD

An integrated copper bar for a secondary power circuit of a power electronic converter, including a transformer primary winding copper bar, a transformer secondary winding copper bar, an inductor winding copper bar, a copper bar for connecting a detection resistor, a copper bar for connecting a drive circuit and a copper bar for connecting an output terminal; wherein, said transformer primary winding copper bar, said transformer secondary winding copper bar, said inductor winding copper bar, said copper bar for connecting a detection resistor, said copper bar for connecting a drive circuit and said copper bar for connecting an output ground terminal are fixed together via injection molding. 15-. (canceled)6. An integrated copper bar for a secondary power circuit of a power electronic converter , comprising a transformer primary winding copper bar , a transformer secondary winding copper bar , an inductor winding copper bar , a copper bar for connecting a detection resistor , a copper bar for connecting a drive circuit and a copper bar for connecting an output terminal; wherein ,said transformer primary winding copper bar, said transformer secondary winding copper bar, said inductor winding copper bar, said copper bar for connecting a detection resistor, said copper bar for connecting a drive circuit and said copper bar for connecting an output ground terminal are fixed together via injection molding.8. The integrated copper bar for a secondary-side power circuit of a power electronic converter of claim 7 , wherein claim 7 ,the bottom surface of said integrated copper bar for a secondary-side power circuit of a power electronic converter is disposed outside of the plastic structure.9. The integrated copper bar for a secondary-side power circuit of a power electronic converter of claim 8 , wherein claim 8 ,said primary winding is shaped as a rectangle ring;said copper bar of the upper coil of said secondary winding and said copper bar of the lower coil of said ...

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Номер записи: 68
25-01-2018 дата публикации

APPARATUS AND METHOD FOR CONTROLLING SYNCHRONIZING RECTIFIER OF LDC

Номер: US20180026543A1
Автор: Han Dae Woong, Jeon Jae Hwa, LEE Sang Kyu, Yim Jeong Bin
Принадлежит:

An apparatus for controlling a synchronizing rectifier of a low voltage direct current (DC)-DC converter (LDC) may include a receiver receiving an LDC output command voltage, and a controller controlling an operation of the synchronizing rectifier based on the received LDC output command voltage. 1. An apparatus for controlling a synchronizing rectifier of a voltage direct current (DC)-DC converter , comprising:a receiver receiving an output command voltage; anda controller controlling an operation of the synchronizing rectifier based on the received output command voltagewherein the controller operates the synchronizing rectifier when the controller determines that the output command voltage exceeds a threshold value.2. The apparatus for controlling the synchronizing rectifier of the converter according to claim 1 , wherein the controller stops an operation of the synchronizing rectifier when the output command voltage does not exceed the threshold value.3. The apparatus for controlling the synchronizing rectifier of the converter according to claim 2 , wherein the controller again operates the synchronizing rectifier that is in a stop state when an output command voltage exceeding the threshold value is newly received.4. A method for controlling a synchronizing rectifier of a voltage direct current (DC)-DC converter claim 2 , the method comprising:receiving, by a receiver, an output command voltage; andcontrolling, by a controller, an operation of the synchronizing rectifier based on the received output command voltage,wherein the controlling includes operating, by the controller, the synchronizing rectifier when the controller determines that the output command voltage exceeds a threshold value.5. The method for controlling the synchronizing rectifier of the converter according to claim 4 , wherein the controlling further includes:stopping, by the controller, an operation of the synchronizing rectifier when the output command voltage does not exceed the threshold ...

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Номер записи: 69
24-04-2014 дата публикации

Power converting device

Номер: US20140112027A1
Автор: Chin-Chuan Huang, Huang-Jen Chiu, Jing-Yuan Lin, Po-Jung Tseng, Sin-Li Lin, Yu-Kang Lo
Принадлежит: Lite On Technology Corp

A power converting device includes a transformer, a first switch coupled to a primary winding of the transformer, a PWM controller which generates a first PWM signal for controlling conduction and non-conduction of the first switch and which generates a control signal that leads the first PWM signal, a rectifier-filter circuit which rectifies an induced voltage generated by a secondary winding of the transformer, a second switch coupled to the secondary winding, and a synchronous rectifier controller which controls conduction and non-conduction of the second switch, and which controls, according to the control signal, the second switch to become non-conductive prior to conduction of the first switch.

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Номер записи: 70
24-04-2014 дата публикации

Control and drive circuit and method

Номер: US20140112031A1
Автор: Wei Chen
Принадлежит: Hangzhou Silergy Semiconductor Technology LTD

Disclosed herein are control and drive circuits and methods for synchronous rectification switching power supply bias voltage generating circuits configured for a switching power supply. In one embodiment, a control and drive circuit can include: (i) a primary side switch controller configured to generate a primary side switch control signal; (ii) a logic circuit configured to generate a first control signal based on the primary side switch control signal; (iii) a converting circuit configured to generate a second control signal based on the first control signal; and (iv) a synchronous rectifier switch controller configured to generate a synchronous rectifier switch control signal based on the second control signal such that phases of the primary side switch control signal and the synchronous rectifier switch control signal are the same or inverse based on a topology of the synchronous rectification switching power supply.

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Номер записи: 71
10-02-2022 дата публикации

CHARGING AND DISCHARGING DEVICE AND CHARGING AND DISCHARGING SYSTEM OF ELECTRIC VEHICLE

Номер: US20220045619A1
Автор: JIA Minli, SUN Hao, Zhang Jinfa
Принадлежит:

A charging and discharging device includes a transformer consisting of a primary winding and multiple secondary windings including at least a first secondary winding and a second secondary winding; multiple ports electrically connected to the primary winding and the multiple secondary windings of the transformer, respectively, wherein the multiple ports at least include a first port electrically connected to the primary winding via a first conversion circuit; a second port electrically connected to the first secondary winding via a second conversion circuit; and a third port electrically connected to the second secondary winding via a third conversion circuit; and a first controllable switch connected between the first conversion circuit and the primary winding. 1. A charging and discharging device , comprising:a transformer comprising a primary winding and multiple secondary windings, which comprises at least a first secondary winding and a second secondary winding; a first port electrically connected to the primary winding via a first conversion circuit;', 'a second port electrically connected to the first secondary winding via a second conversion circuit; and', 'a third port electrically connected to the second secondary winding via a third conversion circuit; and, 'multiple ports electrically connected to the primary winding and the multiple secondary windings of the transformer, respectively, wherein the multiple ports at least comprisea first controllable switch connected between the first conversion circuit and the primary winding;wherein a voltage at the first port of the charging and discharging device is a first voltage, a voltage at the second port is a second voltage, and a voltage at the third port is a third voltage.2. The charging and discharging device according to claim 1 , wherein the third voltage is smaller than the second voltage.3. The charging and discharging device according to claim 1 , wherein the first port is electrically connected to a ...

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Номер записи: 72
24-01-2019 дата публикации

DC-DC CONVERTER

Номер: US20190028036A1
Автор: AOKI Kousuke, Funato Hirohito, OGASAWARA Satoshi, Okazaki Fumihiro
Принадлежит:

A direct current (DC)-DC converter includes: a transformer; a half bridge circuit provided on a primary side of the transformer; a synchronous rectification circuit provided on a secondary side of the transformer; and a controller configured to switch a power semiconductor device for rectification of the synchronous rectification circuit at a duty ratio and a phase corresponding to an input voltage of the half bridge circuit and an output current of the synchronous rectification circuit. 1. A direct current (DC)-DC converter comprising:a transformer;a half bridge circuit provided on a primary side of the transformer;a synchronous rectification circuit provided on a secondary side of the transformer; anda controller configured to switch a power semiconductor device for rectification of the synchronous rectification circuit at a duty ratio and a phase corresponding to an input voltage of the half bridge circuit and an output current of the synchronous rectification circuit.2. The DC-DC converter according to claim 1 , wherein the controller determines the duty ratio at the time of switching the power semiconductor device for rectification with reference to a table of duty ratios in which a combination of the input voltage and the output current and the duty ratio corresponding to the combination are mapped to each other.3. The DC-DC converter according to claim 1 , wherein the controller determines the phase at the time of switching the power semiconductor device for rectification with reference to a table of phases in which a combination of the input voltage and the output current and the phase corresponding to the combination are mapped to each other.4. The DC-DC converter according to claim 2 , wherein the controller refers to the table per control cycle of switching of the power semiconductor device for rectification with respect to at least one of two power semiconductor devices for rectification of the synchronous rectification circuit.5. The DC-DC converter ...

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Номер записи: 73
23-01-2020 дата публикации

Disturbance quelling

Номер: US20200028433A1
Автор: Aichen Low, Gregory Szczeszynski
Принадлежит: PSemi Corp

A power converter that supplies a constant output voltage includes a regulator that connects to a charge pump. The charge pump is operable in plural charge-pump modes. A controller preemptively suppress evidence of occurrence of a transition between said charge-pump modes.

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Номер записи: 74
23-01-2020 дата публикации

SYNCHRONOUS RECTIFIERS WITH REDUCED POWER LOSS AND THE METHOD THEREOF

Номер: US20200028441A1
Автор: Miao Lei
Принадлежит:

A synchronous rectifier monitors a driven signal of a synchronous switch. If the driven signal is provided within a set time length, the driven signal is latched off, to make the system enter light load mode. 1. A synchronous rectifier used in an electronic circuit , wherein the electronic circuit has a transformer including a primary winding and a secondary winding , the synchronous rectifier comprising:a synchronous switch, coupled to the secondary winding of the transformer, the synchronous switch being controlled to be periodically turned on and turned off in response to a driven signal to convert an input voltage to an output voltage; whereinthe driven signal is latched off if the driven signal is not provided within a first set time period, so as to have the synchronous rectifier enter light load mode.2. The synchronous rectifier of claim 1 , further comprising:a first timer, configured to be reset by the driven signal, wherein the first timer keeps timing if the synchronous rectifier does not provide the driven signal to reset it, and wherein if a period of time of the timing reaches the first set time period, the first timer is configured to generate a light load signal to disable a logical and driven circuit, and latch off the driven signal.3. The synchronous rectifier of claim 2 , further comprising:a latch, wherein the light load signal is operable to disable the logical and driven circuit by way of the latch.4. The synchronous rectifier of claim 1 , further comprising:an exit comparator, configured to compare a voltage across the synchronous switch with an exit voltage threshold, wherein if the voltage across the synchronous switch is lower and remains lower than the exit voltage threshold for a second set time period, the driven signal is released, and the synchronous rectifier exits light load mode.5. The synchronous rectifier of claim 4 , further comprising:a second timer, configured to start timing when the voltage across the synchronous switch is ...

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Номер записи: 75
28-01-2021 дата публикации

RECTIFIER CIRCUIT AND POWER SUPPLY UNIT

Номер: US20210028711A1
Автор: Shiomi Takeshi
Принадлежит:

A transient current in a rectifier circuit is effectively reduced. In the rectifier circuit, a current flows from a power supply to a coil when a transistor is turned ON. When the transistor is turned OFF, the current of the coil generates a first reverse voltage to be applied to the rectifier. 1. A rectifier circuit causing a rectification current to flow from a second terminal to a first terminal , the rectifier circuit comprising:a third terminal between the first terminal and the second terminal;a first rectifier connected to the first terminal and the second terminal;a coil connected to the first terminal and the third terminal;a second rectifier connected to the third terminal and the second terminal;a transistor having a source or an emitter connected to the third terminal; anda power supply having a negative electrode connected to the first terminal and a positive electrode connected to a drain or a collector of the transistor, whereina first reverse voltage is applied to the rectifier circuit by a current in the coil.2. The rectifier circuit according to claim 1 , whereinfollowing the first reverse voltage, a second reverse voltage is applied to the rectifier circuit.3. The rectifier circuit according to claim 1 , whereinafter the first reverse voltage reaches a predetermined voltage of 5 V or above, the second reverse voltage is applied to the rectifier circuit.4. The rectifier circuit according to claim 2 , whereinafter the first reverse voltage reaches a predetermined voltage of 5 V or above, the second reverse voltage is applied to the rectifier circuit.5. The rectifier circuit according to claim 2 , whereinthe first reverse voltage is 12% or above and 88% or below the second reverse voltage.6. The rectifier circuit according to claim 3 , whereinthe first reverse voltage is 12% or above and 88% or below the second reverse voltage.7. The rectifier circuit according to claim 4 , whereinthe first reverse voltage is 12% or above and 88% or below the second ...

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Номер записи: 76
28-01-2021 дата публикации

PREDICTIVE SYNCHRONOUS RECTIFIER SENSING AND CONTROL

Номер: US20210028712A1
Автор: Bhardwaj Manish, Yu Sheng-Yang
Принадлежит:

For predictive synchronous rectifier sensing and control, an example apparatus includes an air core toroid having a voltage output, the air core toroid adapted to surround a portion of a current path and adapted to be coupled through the current path to a transformer, and a control logic circuit having a voltage input and a control output, the voltage input coupled to the voltage output, and the control output adapted to be coupled to a switch. 1. An apparatus comprising:an air core toroid having a voltage output, the air core toroid adapted to surround a portion of a current path and adapted to be coupled through the current path to a transformer; anda control logic circuit having a voltage input and a control output, the voltage input coupled to the voltage output, and the control output adapted to be coupled to a switch.2. The apparatus of claim 1 , wherein the air core toroid is a Rogowski coil claim 1 , and the control logic circuit includes:an integrator circuit coupled to the voltage output;a gain amplifier circuit coupled to the integrator circuit;a slope detection logic circuit coupled to the gain amplifier circuit; anda switch control logic circuit coupled to: the integrator circuit, the gain amplifier circuit, the slope detection logic circuit, and adapted to be coupled to the switch.3. The apparatus of claim 2 , wherein:the integrator circuit has a first input, a second input, a first output, and a second output, the first input and the second input coupled to the voltage output; andthe gain amplifier circuit has a third input and a fourth input, the third input coupled to the first input and the fourth input coupled to the second input.4. The apparatus of claim 2 , wherein:the gain amplifier circuit has a first output and a second output;the switch control logic circuit has a first input, a second input, a third input, a third output, a fourth output, and a fifth output, the first input coupled to the first output, the second input coupled to the second ...

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Номер записи: 77
02-02-2017 дата публикации

INSULATED SYNCHRONOUS RECTIFICATION DC/DC CONVERTER

Номер: US20170033703A1
Автор: Kikuchi Hiroki, SHIMIZU Ryo
Принадлежит:

A first capacitor and an auxiliary power supply are provided to a secondary side of an insulated synchronous rectification DC/DC converter, in addition to a synchronous rectification transistor and a secondary-side controller. One end of the first capacitor is connected to a first node that connects the synchronous rectification transistor and a secondary winding. The auxiliary power supply charges the first capacitor using the voltage Vsupplied via the output line, so as to stabilize the voltage across the first capacitor. The ground voltage is supplied to the secondary-side controller via the first node. Furthermore, the power supply voltage is supplied to the secondary-side controller via the other end of the first capacitor. 1. A DC/DC converter configured as an insulated synchronous rectification DC/DC converter , the DC/DC converter comprising:a transformer comprising a primary winding and a secondary winding;an output line connected to a load;a switching transistor connected to the primary winding;a synchronous rectification transistor arranged between the secondary winding and the output line;a primary-side controller that drives the switching transistor;a secondary-side controller that drives the synchronous rectification transistor;a first capacitor having a first electrode connected to a first node that connects the secondary winding and the synchronous rectification transistor; andan auxiliary power supply that charges the first capacitor using a voltage supplied via the output line, so as to stabilize a voltage across the first capacitor,wherein a ground voltage is supplied to the secondary-side controller via the first node,and wherein a power supply voltage is supplied to the secondary-side controller via a second electrode of the first capacitor.2. The DC/DC converter according to claim 1 , wherein the auxiliary power supply comprises a first resistor arranged between the output line and the second electrode of the first capacitor.3. The DC/DC ...

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Номер записи: 78
02-02-2017 дата публикации

HIGH SPEED SYNC FET CONTROL

Номер: US20170033787A1
Автор: Brinlee Antony E.
Принадлежит: Flextronics AP, LLC

A circuit arrangement is disclosed for controlling the switching of a field effect transistor (FET). A current controlled amplifier may be configured to amplify a current in a current sense device to generate an amplified current, wherein the current in the current sense device indicates a current through the FET. A comparator may be coupled to the current sense amplifier to compare a voltage corresponding to the amplified current with a voltage reference and to generate a comparator output based on the comparison, wherein the comparator output controls whether the FET is on or off. 1. An apparatus for controlling a field effect transistor (FET) , the apparatus comprising:a current controlled amplifier configured to amplify a current in a current sense device to generate an amplified current, wherein the current in the current sense device indicates a current through the FET;a comparator coupled to the current controlled amplifier, the comparator configured to compare a voltage corresponding to the amplified current with a voltage reference and to generate a comparator output based on the comparison, wherein the comparator output controls whether the FET is on or off; anda hysteresis resistance coupled to an output of the comparator, wherein the hysteresis resistance is configured to effect hysteresis in the output of the comparator.2. The apparatus of claim 1 , wherein the current sense device is a copper trace claim 1 , and wherein the apparatus further comprises:a compensation device configured to compensate for a change in resistance in the copper trace, and wherein the compensation device includes at least one of a negative temperature coefficient (NTC) thermistor and a positive temperature coefficient (PTC) thermistor; andcircuitry configured to selectively enable or disable compensation for the change in the resistance in the copper trace.3. The apparatus of claim 1 , wherein the current sense device is a shunt resistor.4. The apparatus of claim 1 , wherein ...

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Номер записи: 79
01-05-2014 дата публикации

SYNCHRONOUS RECTIFIER CIRCUIT

Номер: US20140119061A1
Автор: CHIBA Akiteru, ISHIKURA Keita
Принадлежит: Sanken Electric Co., Ltd.

Provided is a synchronous rectifier circuit which, even if a synchronous rectification element having a low on-resistance is used, can perform a synchronous rectifying operation without being influenced by the inductance component. It is a synchronous rectifier circuit having a synchronous rectification element Q and a synchronous rectification control circuit IC for turning on/off the synchronous rectification element Q in accordance with the current iflowing through the synchronous rectification element Qincluding a current detection circuit for detecting the current iflowing through the synchronous rectification element Qduring an on-period of the synchronous rectification element Q as a synchronized voltage waveform, the synchronous rectification control circuit IC being configured so as to turn off the synchronous rectification element Q on the basis of the voltage waveform detected by the current detection circuit 1. A synchronous rectifier circuit having a synchronous rectification element , and a synchronous rectification control circuit for turning on/off said synchronous rectification element according to the current flowing through the synchronous rectification element ,comprising a current detection circuit for detecting the current flowing through said synchronous rectification element during an on-period of said synchronous rectification element as a synchronized voltage waveform,said synchronous rectification control circuit turning off said synchronous rectification element on the basis of said voltage waveform detected by said current detection circuit.2. The synchronous rectifier circuit according to claim 1 , wherein said synchronous rectification control circuit turns on said synchronous rectification element according to the saturation voltage of said synchronous rectification element claim 1 , while turning off said synchronous rectification element according to said saturation voltage of said synchronous rectification element and said voltage ...

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Номер записи: 80
04-02-2016 дата публикации

INSULATION-TYPE SYNCHRONOUS DC/DC CONVERTER

Номер: US20160036339A1
Автор: Kikuchi Hiroki
Принадлежит:

Asynchronous rectifier controller is provided on a secondary side of an insulation-type synchronous DC/DC converter and controls the synchronous rectifier transistor. A driver circuit controls the synchronous rectifier transistor. A photo coupler connection terminal is coupled to an input side of the photo coupler. An error amplifier amplifies an error between a voltage detection signal according to an output voltage of the DC/DC converter and its target voltage, and to draw a current according to the error from an input side of the photo coupler via the photo coupler connection terminal. 1. Asynchronous rectifier controller provided on a secondary side of an insulation-type synchronous DC/DC converter , wherein the DC/DC converter comprises:a transformer having its primary winding and its secondary winding;a switching transistor coupled to the primary winding of the transformer;a synchronous rectifier transistor coupled to the secondary winding of the transformer;a photo coupler; anda primary controller coupled to an output of the photo coupler, and configured to control the switching transistor according to a feedback signal from the photo coupler, and wherein the synchronous rectifier controller comprises:a driver circuit for switching the synchronous rectifier transistor;a photo coupler connection terminal coupled to an input side of the photo coupler; andan error amplifier structured to amplify an error between a voltage detection signal according to an output voltage of the DC/DC converter and its target voltage, and to draw a current according to the error from an input side of the photo coupler via the photo coupler connection terminal, wherein the synchronous rectifier controller is packaged in a single module.2. The synchronous rectifier controller according to claim 1 , wherein a power supply plane for the error amplifier and a power supply plane for the driver circuit are isolated each other claim 1 , and a ground plane for the error amplifier and a ...

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Номер записи: 81
04-02-2016 дата публикации

Insulation-type synchronous dc/dc converter

Номер: US20160036340A1
Автор: Hiroki Kikuchi, Ryo Shimizu
Принадлежит: ROHM CO LTD

The feedback IC is provided at the secondary side of the DC/DC converter and is coupled to the photo coupler. The error amplifier amplifies an error between a voltage detection signal according to an output voltage of the DC/DC converter and a target voltage, and draws a current according to the error from the input side of the feedback photo coupler via the photo coupler connection terminal. The abnormal detection circuit asserts an abnormal detection signal when an abnormal condition in a secondary side of the DC/DC converter is detected. The protection circuit is coupled to the photo coupler connection terminal, and acts on the feedback photo coupler via the photo coupler connection terminal so that a feedback operation by the error amplifier is invalid and an on-period of the switching transistor is shorten.

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Номер записи: 82
01-02-2018 дата публикации

RESONANT CONVERTER AND DRIVING METHOD THEREOF

Номер: US20180034261A1
Автор: BAEK Hyeong Seok, Choi Hang-Seok, JANG Ji-Hoon, LEE Won-Tae
Принадлежит: FAIRCHILD KOREA SEMICONDUCTOR LTD.

A resonant converter includes a first switch on the primary side and a second switch coupled to the first switch, a synchronization rectification switch on a secondary side configured to conduct during a conduction period in response to a switching operation of the first switch, and a switch control circuit configured to determine an operating region of the resonant converter to be below resonance based on a result of a comparison between the conduction period and an on period of the first switch. 1. A switch control circuit for a resonant converter , the switch control circuit comprising:a first driver circuit configured to drive a first switch on a primary side;a second driver circuit configured to drive a first synchronous rectification switch on a secondary side; anda below resonance detection circuit configured to determine that an operating region of the resonant converter is below resonance based on a result of a comparison between a conduction period of the first synchronous rectification switch and an on period of the first switch.2. The switch control circuit of claim 1 , wherein the below resonance detection circuit is configured to determine that the operating region of the resonant converter is below resonance when a state in which the conduction period of the first synchronous rectification switch is shorter than the on period of the first switch is maintained during a first debounce time.3. The switch control circuit of claim 1 , wherein the below resonance detection circuit is configured to determine that the operating region of the resonant converter is not below resonance when a state in which the conduction period of the first synchronous rectification switch is longer than the on period of the first switch is maintained during a second debounce time.4. The switch control circuit of claim 1 , wherein the below resonance detection circuit is configured to generate a below detection signal indicative of below resonance operation based on a maximum ...

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Номер записи: 83
01-02-2018 дата публикации

INDUCTIVE POWER RECEIVER

Номер: US20180034324A1
Автор: ABDOLKHANI Ali
Принадлежит: PowerbyProxi Limited

An inductive power receiver having a power pick-up stage and a power rectification and regulation stage consisting of a single current control element configured to rectify the voltage from the power pick-up stage in a first half cycle and to regulate the voltage from the power pick-up stage in a second half cycle. 1. An inductive power receiver comprising:a power pick-up stage; anda power rectification and regulation stage consisting of a single current control element configured to rectify the voltage from the power pick-up stage in a first half cycle and to regulate the voltage from the power pick-up stage in a second half cycle.2. The receiver in wherein the power pick-up stage includes a receiver coil connected in parallel with a tuned resonant capacitor.3. The receiver in wherein the current control element is a switch.4. The receiver in wherein the current control element is a single MOSFET or two back to back MOSFETs.5. The receiver in wherein the current control element is configured to pass power to a load during the first half cycle and from the load during the second half cycle.6. The inductive power receiver in wherein the power pick-up stage is connected to the power rectification and regulation stage without a DC inductor. This invention relates generally to a converter, particularly though not solely, to a converter for an inductive power receiver.Electrical converters are found in many different types of electrical systems. Generally speaking, a converter converts a supply of a first type to an output of a second type. Such conversion can include DC-DC, AC-AC and DC-AC electrical conversions. In some configurations a converter may have any number of DC and AC ‘parts’, for example a DC-DC converter might incorporate an AC-AC converter stage in the form of a transformer.One example of the use of converters is in inductive power transfer (IPT) systems. IPT systems are a well-known area of established technology (for example, wireless charging of ...

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Номер записи: 84
01-02-2018 дата публикации

High-efficiency fully soft-switching single-stage three-level (ss-3) power amplifier

Номер: US20180034359A1
Автор: Jianhui SU, Shilin Guo, Xue Jian Chen
Принадлежит: Guangdong Redx Electrical Technology Ltd

The present disclosure relates to a circuit arrangement which comprises one high-efficiency fully soft-switching single-stage 3-level power amplifier with dual auxiliary networks. The primary-side passive auxiliary network is formed by one inductor and two capacitors to extend soft switching ranges and avoid switching loss. The secondary-side active auxiliary network is constituted of four switches, three capacitors and two inductors which not only removes or maximally reduces otherwise occurring disruptive spikes but also assists zero voltage switching (ZVS) for switches of active auxiliary network. A predictive gate drive method for driving power switches is presented to guarantee ZVS turn-on. The proposed circuit achieves high level of integration without bulky dc link capacitor, and high-efficiency by single-stage conversion and ZVS for all the switches under different operating conditions.

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Номер записи: 85
01-02-2018 дата публикации

BIDIRECTIONAL INSULATED DC-DC CONVERTER

Номер: US20180034360A1
Автор: HIRABAYASHI Nobuo
Принадлежит: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI

A bidirectional insulated DC-DC converter includes a transformer, a secondary circuit, and a control circuit. When electric power is transferred from the secondary side to the primary side of the transformer, the control circuit measures a first voltage on a high voltage side of the transformer and a second voltage on a low voltage side of the transformer in each cycle time. When the voltage ratio is a reference value or larger, the control circuit calculates a first period during which the control circuit turns ON the first switching element and a second period during which the control circuit turns ON the second switching element after the first period of the cycle time so that a period ratio is larger than a reference value and controls the first switching element and the second switching element based on the first period and the second period. 1. A bidirectional insulated DC-DC converter comprising;a transformer having a primary winding and a secondary winding;a secondary circuit connected to the secondary winding of the transformer and including a coil, a first switching element, and a second switching element, wherein a first terminal of the coil and a first terminal of the first switching element are connected to a first terminal of the secondary winding of the transformer, wherein a first terminal of the second switching element is connected to a second terminal of the secondary winding, and wherein a second terminal of the first switching element and a second terminal of the second switching element are connected to each other; and{'b': 1', '1', '1, 'a control circuit controlling the first switching element and the second switching element, wherein when electric power is transferred from the secondary side to the primary side of the transformer, the control circuit measures a first voltage VH that denotes a DC voltage of the primary winding on a high voltage side of the transformer and a second voltage VL that denotes a DC voltage of the secondary winding ...

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Номер записи: 86
01-02-2018 дата публикации

SYSTEMS AND METHODS WITH PREDICTION MECHANISMS FOR SYNCHRONIZATION RECTIFIER CONTROLLERS

Номер: US20180034377A1
Автор: Cao Yaming, Fang Lieyi, Luo Qiang
Принадлежит:

System controller and method for regulating a power converter. For example, the system controller includes a first controller terminal and a second controller terminal. The system controller is configured to receive, at the first controller terminal, an input signal, generate a drive signal based at least in part on the input signal, and output, at the second controller terminal, the drive signal to a switch to affect a current associated with a secondary winding of the power converter. The system controller is further configured to detect a first duration of a demagnetization period associated with the secondary winding based at least in part on the input signal, determine a second duration of a time period for the drive signal based at least in part on the first duration, and keep the drive signal at a first logic level during the entire time period. 1. A system controller for regulating a power converter , the system controller comprising:a first controller terminal; anda second controller terminal; receive, at the first controller terminal, an input signal;', 'generate a drive signal based at least in part on the input signal; and', 'output, at the second controller terminal, the drive signal to a switch to affect a current associated with a secondary winding of the power converter;, 'wherein the system controller is configured to detect a first duration of a demagnetization period associated with the secondary winding based at least in part on the input signal, the demagnetization period including a first beginning and a first end;', 'determine a second duration of a time period for the drive signal based at least in part on the first duration, the time period including a second beginning and a second end, the second end being after the first end; and', 'keep the drive signal at a first logic level during the entire time period to keep the switch closed during the entire time period., 'wherein the system controller is further configured to2. The system ...

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Номер записи: 87
17-02-2022 дата публикации

DIRECT-CURRENT VOLTAGE CONVERTER FOR BIDIRECTIONAL ELECTRICAL POWER TRANSMISSION FROM A PRIMARY SIDE TO A SECONDARY SIDE OF THE DIRECT-CURRENT VOLTAGE CONVERTER OR VICE VERSA

Номер: US20220052610A1
Автор: Plum Thomas
Принадлежит:

The invention relates to a direct-current voltage converter () for electrical power transmission from a secondary side to a primary side of the direct-current voltage converter (), which has on the primary side an actively clamped flyback converter circuit having a controlled first switch () and a controlled second switch (), and the primary side is inductively coupled to the secondary side. The current of a secondary coil () on the secondary side, for inductive coupling to the primary side, is switched by a single controlled third switch () on the secondary side, and the direct-current voltage converter has a regulator () which, in parts of a regulating cycle, conductively connects the third switch () to the first switch (). 1101010. A DC-DC converter () for electrical power transmission from a secondary side to a primary side of the DC-DC converter () , the DC-DC converter comprising:{'b': ['5', '6'], 'claim-text': [{'b': ['5', '11', '1', '11'], 'i': ['a', 'b'], '#text': 'wherein the primary coil () is connected on one side to a first primary voltage terminal () and is connected on the other side, in series with a first switch (), to a second primary voltage terminal (),'}, {'b': ['5', '4', '2'], '#text': 'wherein, in parallel with the primary coil (), a capacitor () is connected in series with a second switch (), and'}, {'b': ['6', '9', '3'], 'i': 'a', '#text': 'wherein the secondary coil () is connected on one side to a first secondary voltage terminal () and is connected on the other side, in series with a third switch (),'}], '#text': 'a transformer having a primary-side primary coil () and a secondary-side secondary coil (),'}{'b': '9', 'i': 'b', '#text': 'to a second secondary voltage terminal (), and'}{'b': '12', '#text': 'a regulating device () configured'}{'b': ['1', '2', '3', '1', '2', '5'], '#text': 'to switch the first (), second () and third switches () off and on repeatedly, wherein the first switch () is always switched off when the second switch () ...

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Номер записи: 88
17-02-2022 дата публикации

FLYBACK POWER CONVERTER AND ACTIVE CLAMP SNUBBER THEREOF

Номер: US20220052612A1
Автор: LIN Tzu-Chen
Принадлежит:

A flyback power converter includes: a power transformer, a primary side control circuit, a secondary side control circuit, and an active clamp snubber including a snubber switch and a control signal generation circuit. The control signal generation circuit controls the snubber switch to be conductive during a soft switching period in an OFF period of a primary side switch within a switching period of the switching signal, whereby the primary side switch achieves soft switching. A starting time point of the soft switching period is determined by a current threshold, so that a secondary side current is not lower than the current threshold at the starting time point, whereby the secondary side control circuit keeps the SR switch conductive at the starting time point. The secondary side control circuit turns OFF the SR switch when the secondary side current is lower than the current threshold. 1. A flyback power converter , which is configured to operably convert an input voltage to an output voltage; the flyback power converter comprising:a power transformer, which is coupled between the input voltage and the output voltage;a primary side control circuit, which is configured to operably generate a switching signal for controlling a primary side switch, so as to operate a primary winding of the power transformer, wherein the primary winding is coupled to the input voltage;a secondary side control circuit, which is configured to operably control a synchronous rectifier (SR) switch connected in series to a secondary winding of the power transformer according to a secondary side current flowing through the secondary winding of the power transformer, wherein the secondary side control circuit is configured to operably turn OFF the SR switch when the secondary side current is lower than a current threshold; and{'claim-text': ['a snubber switch; and', 'a control signal generation circuit, wherein the control signal generation circuit is configured to operably control the ...

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Номер записи: 89
17-02-2022 дата публикации

SYNCHRONOUS RECTIFICATION CONTROL SYSTEM AND METHOD FOR QUASI-RESONANT FLYBACK CONVERTER

Номер: US20220052613A1
Автор: QI Congming, Shi Longxing, SHI Xiaoyu, Sun Weifeng, Xu Shen, Zhang Sen, Zhao Siyu
Принадлежит:

A synchronous rectification control system and method for a quasi-resonant flyback converter are provided. The control system includes a switching transistor voltage sampling circuit configured to sample an output terminal voltage of the switching transistor to obtain a sampled voltage of the switching transistor; a sampling calculation module configured to obtain a dead-time based on the sampled voltage of the switching transistor and a preset relationship, the preset relationship being a correspondence between the duration of the sampled voltage of the switching transistor being below a first preset value and the dead-time during an on-time of a switching cycle of the switching transistor, the dead-time being a time from when the switching transistor is turned off to when the synchronous rectification transistor is turned on; and a control module configured to receive the dead-time and control switching of the synchronous rectification transistor based on the dead-time. 1. A synchronous rectification control method for a quasi-resonant flyback converter , the flyback converter comprising a primary side of a transformer and a secondary side of the transformer , the primary side comprising a primary winding and a switching transistor , the secondary side comprising a secondary winding , a synchronous rectification transistor and a resonant capacitor , the method comprising:sampling an output terminal voltage of the switching transistor to obtain a sampled voltage of the switching transistor;obtaining a dead-time based on the sampled voltage of the switching transistor and a preset relationship, the preset relationship being a correspondence between a duration of the sampled voltage of the switching transistor being below a first preset value and the dead-time during an on-time of the switching cycle, the dead-time being a time from when the switching transistor is turned off to when the synchronous rectification transistor is turned on; andcontrolling switching of ...

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Номер записи: 90
17-02-2022 дата публикации

SWITCHING CIRCUIT, SYNCHRONOUS RECTIFICATION CONTROL CIRCUIT AND CONTROL METHOD THEREOF

Номер: US20220052614A1
Автор: Li Xinlei, Zhang Qiao
Принадлежит:

A synchronous rectification control circuit for controlling a switching circuit comprising a synchronous rectifier switch, can include: a drive circuit configured to generate a drive signal to control switching states of the synchronous rectifier switch; and a voltage regulation circuit configured to control the drive circuit to adjust an amplitude of the drive signal to decrease to a preset threshold in an adjustment state when a drain-source voltage of the synchronous rectifier switch is greater than an adjustment threshold before the synchronous rectifier switch is turned off, where a time that the voltage regulation circuit is in the adjustment state is an adjustment time. 1. A synchronous rectification control circuit for controlling a switching circuit comprising a synchronous rectifier switch , the control circuit comprising:a) a drive circuit configured to generate a drive signal to control switching states of the synchronous rectifier switch; andb) a voltage regulation circuit configured to control the drive circuit to adjust an amplitude of the drive signal to decrease to a preset threshold in an adjustment state when a drain-source voltage of the synchronous rectifier switch is greater than an adjustment threshold before the synchronous rectifier switch is turned off, wherein a time that the voltage regulation circuit is in the adjustment state is an adjustment time, and wherein the drain-source voltage is changing during the adjustment time.2. The control circuit of claim 1 , wherein the adjustment time changes adaptively in accordance with a change of the adjustment threshold.3. The control circuit of claim 1 , wherein the voltage regulation circuit comprises a threshold adjustment circuit configured to adjust the adjustment threshold in accordance with the adjustment time in previous periods and a predetermined time claim 1 , in order to make the adjustment time equal to the predetermined time.4. The control circuit of claim 1 , wherein the threshold ...

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Номер записи: 91
31-01-2019 дата публикации

RESONANT POWER TRANSFER

Номер: US20190036348A1
Автор: Boys John Talbot, Covic Grant Anthony
Принадлежит:

The present invention relates to a current multiplier primarily in the field of power conversion. The invention relates to a controlled current multiplier with a resonant winding to assist with, for example, power conversion. In particular, but not solely, the invention may broadly consist in a current multiplier comprising: a primary winding associated with a power source; a secondary winding associated with a load; a resonant winding associated with a capacitance; and a control means for controlling an output of the secondary winding to the load, the control means associated with the primary or resonant winding. This allows, for instance, control of the high current output to be placed on a low current winding. 1. A current multiplier comprising:a primary winding associated with a power source;a secondary winding associated with a load;a resonant winding associated with a capacitance; anda control means for controlling an output of the secondary winding to the load, the control means associated with the primary or resonant winding.2. The current multiplier as claimed in wherein the primary claim 1 , secondary and resonant windings are wound around a magnetically permeable material.3. The current multiplier as claimed in wherein the magnetically permeable material is substantially toroidal.4. The current multiplier as claimed in wherein the magnetically permeable material includes a gap.5. The current multiplier as claimed in wherein the gap is adapted to allow a coil of the secondary winding to pass through.6. The current multiplier as claimed in comprising a further winding associated with the magnetically permeable material.7. The current multiplier as claimed in wherein each of the primary claim 1 , secondary and resonant windings is spaced apart from one another.8. The current multiplier as claimed in comprising a rectification means electrically connected to the secondary winding.9. The current multiplier as claimed in wherein the capacitance associated with ...

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Номер записи: 92
31-01-2019 дата публикации

PRIMARY SIDE CONTROL OF PRIMARY RESONANT FLYBACK CONVERTERS

Номер: US20190036442A1
Автор: Oh InHwan
Принадлежит:

A primary resonant flyback converter may include a primary winding, a resonant capacitor in series with the primary winding, a secondary winding magnetically coupled to the primary winding, and an output electrically coupled to the secondary winding. A main switch may be operated to energize the primary winding when closed and transfer energy stored in the primary winding to the secondary winding when open. An auxiliary switch may be configured to switch complimentarily to the main switch, thereby allowing a resonant current to circulate through the primary winding and capacitor. Switch timing may be controlled to produce a desired output voltage. The primary resonant flyback converter may include one or more of: (a) output voltage sensing across the resonant capacitor; (b) a full bridge switch configuration; and (c) lossless current sensing using a current sensing circuit coupled in parallel with the resonant capacitor. 1. A primary resonant flyback converter comprising:a primary winding;a secondary winding magnetically coupled to the primary winding and electrically coupled to an output rectifier, and an output terminal;a resonant capacitor coupled in series with the primary winding;a main switch configured to switch on to energize the primary winding and the resonant capacitor from a DC voltage bus and to switch off to transfer energy stored in the primary winding to the secondary winding;an auxiliary switch configured to switch on during an off time of the main switch to allow a resonant current to circulate through the primary winding and the resonant capacitor; anda control circuit configured to operate the main switch and the auxiliary switch to produce a desired voltage at the output terminal.2. The primary resonant flyback converter of wherein the control circuit is configured to operate the main switch and the auxiliary switch responsive to a voltage measured across the resonant capacitor.3. The primary resonant flyback converter of wherein:the main switch ...

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Номер записи: 93
31-01-2019 дата публикации

SWITCH CIRCUIT WITH ACTIVE SNUBBER CIRCUIT AND DC-DC CONVERTER

Номер: US20190036445A1
Автор: MUTO Takami, NISHIYAMA Takayoshi
Принадлежит:

A switch circuit includes a first switch element defined by an FET, and an active snubber circuit connected between a drain and a source of the first switch element and including a second switch element defined by an FET, a capacitor connected in series to the second switch element, a third switch element connected to a gate of the second switch element and turned on to extract an electric charge of capacitance between the gate and a source of the second switch element, and a delay circuit that turns on the third switch element at a timing delayed from a timing at which the second switch element is turned on. 1. A switch circuit comprising:a first switch element defined by an FET; andan active snubber circuit connected between a drain and a source of the first switch element; wherein a second switch element defined by an FET;', 'a third switch element defined by an FET;', 'a capacitor connected in series to the second switch element; and', 'a delay circuit connected to the third switch element;, 'the active snubber circuit includesthe third switch element is connected to a gate of the second switch element and is turned on to extract an electric charge of capacitance between the gate and a source of the second switch element; andthe delay circuit includes a connecting capacitor configured to generate a control terminal voltage for the third switch element, a constant current circuit configured to charge the connecting capacitor, and a diode configured to discharge the connecting capacitor; andthe delay circuit is configured to turn on the third switch element at a timing delayed from a timing at which the second switch element is turned on.2. The switch circuit including the active snubber circuit according to claim 1 , whereinthe constant current circuit includes a transistor and a first resistor which is connected between a base and a collector of the transistor; andthe diode is connected in parallel between the collector and an emitter of the transistor.3. The ...

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Номер записи: 94
31-01-2019 дата публикации

POWER FACTOR CORRECTED PRIMARY RESONANT FLYBACK CONVERTERS

Номер: US20190036447A1
Автор: Cherian Abby, Oh InHwan, Patel Bharat
Принадлежит:

A primary resonant flyback converter may include a primary winding, a resonant capacitor in series with the primary winding, a secondary winding magnetically coupled to the primary winding, and an output electrically coupled to the secondary winding. A main switch may be operated to energize the primary winding when closed and transfer energy stored in the primary winding to the secondary winding when open. An auxiliary switch may be configured to switch complimentarily to the main switch, thereby allowing a resonant current to circulate through the primary winding and capacitor. Switch timing may be controlled to produce a desired output voltage. The converter may also include an input inductor that receives an input voltage, presenting an improved power factor to an AC input power source and in conjunction with the switching devices boosts a rectified AC input voltage to a DC voltage bus of the converter. 1. A power factor corrected primary resonant flyback converter comprising:an input inductor having a first terminal adapted to receive an input voltage and a second terminal;a main switch having a first terminal coupled to the second terminal of the input inductor and configured to switch on to energize a primary winding and a resonant capacitor from a DC voltage bus and to switch off to transfer energy stored in the primary winding to a secondary winding magnetically coupled to the primary winding and electrically coupled to an output terminal configured to receive a load; andan auxiliary switch having a first terminal coupled to a DC voltage bus and a second terminal coupled to the first terminal of the main switch and the second terminal of the input inductor and configured to switch on during an off time of the main switch thereby allowing a resonant current to circulate through the primary winding and the resonant capacitor;wherein the primary winding has a first terminal coupled to the first terminal of the auxiliary switch and a second terminal; andwherein ...

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Номер записи: 95
31-01-2019 дата публикации

Flyback power converters including adaptive clamp circuits for adjusting resonant frequencies

Номер: US20190036459A1
Автор: Chunyu DING, Jun Liu, Qingfeng Liu, Zhe Li
Принадлежит: Astec International Ltd

A switch mode power supply includes a flyback power converter and a control circuit. The flyback power converter includes an input, an output, a transformer coupled between the input and the output, a power switch coupled between the input and the transformer, and a clamp circuit coupled between the input and the transformer. The clamp circuit includes a capacitor and a clamp switch coupled in series with the capacitor. The control circuit is configured to control the power switch and the clamp switch. The switch mode power supply further includes at least one additional capacitor coupled in parallel with the capacitor of the clamp circuit to facilitate selection of a combination of capacitors to adjust a resonant frequency of the clamp switch for optimizing efficiency of the power supply. Other examples switch mode power supplies and/or methods for adjusting a resonant frequency of flyback power converters are also disclosed.

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Номер записи: 96
30-01-2020 дата публикации

ZVS CONTROL CIRCUIT FOR USE IN A FLYBACK POWER CONVERTER

Номер: US20200036280A1
Автор: LIN Tzu-Chen, TANG Chien-Fu, YANG Ta-Yung
Принадлежит:

A ZVS (zero voltage switching) control circuit for use in a flyback power converter includes a primary side controller and a secondary side controller. The primary side controller generates a switching signal to control a power transformer through a power transistor to generate an output voltage. The secondary side controller generates an SR (synchronous rectifier) signal to control an SR transistor at a secondary side of the power transformer. The SR signal includes an SR-control pulse and a ZVS pulse. The SR-control pulse controls the SR transistor according to a demagnetizing period of the power transformer. The ZVS pulse determines the starting timing of the switching signal to achieve zero voltage switching for the power transistor. The secondary side controller generates the ZVS pulse after a delay time from when the power transformer is demagnetized. The delay time is determined according to an output load of the output voltage. 1. A zero voltage switching (ZVS) control circuit , configured to operably control a flyback power converter including a power transformer having a primary side and a secondary side , the ZVS control circuit comprising:a primary side controller circuit, configured to operably generate a switching signal according to a feedback signal, wherein the switching signal controls a power transformer through a power transistor at the primary side to generate an output voltage at the secondary side; anda secondary side controller circuit, configured to operably generate the feedback signal, and generate an SR signal to control a synchronous rectifier transistor at the secondary side, wherein the SR signal includes an SR-control pulse and a ZVS pulse, wherein the SR-control pulse controls the synchronous rectifier transistor in response to a demagnetizing period of the power transformer, and wherein the ZVS pulse controls the power transformer through the synchronous rectifier transistor to determine a timing for starting the switching signal to ...

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Номер записи: 97
30-01-2020 дата публикации

Power Converter with Low Drain Voltage Overshoot in Discontinuous Conduction Mode

Номер: US20200036282A1
Автор: Escudero Rodriguez Manuel, Kutschak Matteo-Alessandro
Принадлежит:

A power converter includes a primary side with switch devices that form a power transfer stage, and a secondary side with switch devices that form a rectification stage and an output filter coupled to the rectification stage and including an output inductor and output capacitor. A transformer couples the primary and secondary sides. The switch devices are controlled in DCM (discontinuous conduction mode) to transfer energy from the primary side to the secondary side during a power transfer interval in which one branch of the power transfer stage is conducting, one branch of the rectification stage is conducting and another branch of the rectification stage is blocking. As a voltage of the transformer first begins to rise at the start of a new power transfer interval in DCM, the branch of the rectification stage that is to be conducting during the new power transfer interval is hard switched on. 1. A power converter , comprising:a primary side comprising switch devices that form a power transfer stage;a secondary side comprising switch devices that form a rectification stage and an output filter coupled to the rectification stage, the output filter comprising an output inductor and an output capacitor;a transformer coupling the primary side and the secondary side; anda controller operable to control the switch devices in DCM (discontinuous conduction mode), to transfer energy from the primary side to the secondary side during a power transfer interval in which one branch of the power transfer stage is conducting, one branch of the rectification stage is conducting and another branch of the rectification stage is blocking,wherein as a voltage of the transformer first begins to rise at the start of a new power transfer interval in DCM, the controller is operable to hard switch on the branch of the rectification stage that is to be conducting during the new power transfer interval, so that the branch of the rectification stage that is hard switched on begins dissipating ...

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Номер записи: 98
30-01-2020 дата публикации

HYBRID SECONDARY-SIDE REGULATION

Номер: US20200036291A1
Автор: Li Yong, Liu Wenduo, Wang Xiaoyan, Zheng Cong
Принадлежит:

A flyback converter control architecture is provided in which primary-only feedback techniques are used to ensure smooth startup and detection of fault conditions. During steady-state operation, secondary-side regulation is employed. In addition, current limits are monitored during steady-state operation using primary-only feedback techniques to obviate the need for a secondary-side current sense resistor. 1. A method for a flyback converter , comprising:in a secondary-side controller for the flyback converter, comparing an output voltage for the flyback converter to a reference voltage to determine a control voltage;transmitting the control voltage from the secondary-side controller to a primary-side controller;in a pulse width modulation mode of operation for the flyback converter, processing the control voltage to determine a desired peak current for a power switch;following a cycling on of the power switch in a first power switch cycle, switching off the power switch responsive to a current through the power switch equaling the desired peak current;following the switching off of the power switch, determining a transformer reset time from an auxiliary winding voltage; anddetermining an average output current for the flyback converter from the transformer reset time and the current through the power switch.2. The method of claim 1 , further comprising:control a cycling of the power switch during a subsequent second power switch cycle independently of the control voltage responsive to the average output current exceeding a current limit3. The method of claim 1 , wherein comparing the output voltage for flyback converter to the reference voltage comprises generating an error voltage claim 1 , the method further comprising filtering the error voltage in a loop filter to produce the control voltage.4. The method of claim 1 , further comprising:from the primary-side controller, transmitting an on and off status of the power switch to the secondary-side controller.5. ...

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Номер записи: 99
30-01-2020 дата публикации

METHODS AND APPARATUS FOR ADAPTIVE SYNCHRONOUS RECTIFIER CONTROL

Номер: US20200036293A1
Автор: Kannan Bharath Balaji, LU Bing
Принадлежит:

Methods, apparatus, systems, and articles of manufacture are disclosed for adaptive synchronous rectifier control. An example apparatus includes an adaptive off-time control circuit to determine a first voltage and a second voltage when a drain voltage of a switch satisfies a voltage threshold, the first voltage based on a first off-time of the switch, the second voltage based on the first off-time and a first scaling factor, determine a third voltage based on a second scaling factor and a second off-time of the switch, the second off-time after the first off-time, and determine a third off-time of the switch based on at least one of the second voltage or the third voltage. The example apparatus further includes a driver to turn off the switch for at least the third off-time after the second off-time. 1. An apparatus , comprising: determine a first voltage and a second voltage when a drain voltage of a switch exceeds a voltage threshold, the first voltage based on a first off-time of the switch, the second voltage based on the first off-time and a first scaling factor;', 'determine a third voltage based on a second scaling factor and a second off-time of the switch, the second off-time after the first off-time; and', 'determine a third off-time of the switch based on at least one of the second voltage or the third voltage; and, 'an adaptive off-time control circuit toa driver to turn off the switch for at least the third off-time after the second off-time.2. The apparatus of claim 1 , wherein the first scaling factor is based on a gain of an operational amplifier included in the adaptive off-time control circuit.3. The apparatus of claim 1 , wherein the adaptive off-time control circuit includes a voltage divider circuit including a first resistor and a second resistor claim 1 , the second scaling factor based on a first resistance value of the first resistor and a second resistance value of the second resistor.4. The apparatus of claim 1 , wherein the adaptive off- ...

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Номер записи: 100