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Flyback Converter

Flyback Converter-related patent applications - as published by the U.S. Patent and Trademark Office (USPTO).


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Control method and device employing primary side regulation in a quasi-resonant ac/dc flyback converter ...
Stmicroelectronics S.r.l.
January 04, 2018 - N°20180007751

A primary-side controlled high power factor, low total harmonic distortion, quasi resonant converter converts an ac mains power line input to a dc output for powering a load, such as a string of leds. The ac mains power line input is supplied to a transformer that is controlled by a power switch. A device for controlling a power transistor of ...
Secondary-side control circuit, control method and flyback converter thereof
Silergy Semiconductor Technology (hangzhou) Ltd
December 07, 2017 - N°20170353099

A method of controlling a secondary-side rectifier switch of a flyback converter, can include: detecting a slope parameter of a secondary-side detection voltage along a predetermined direction, where the secondary-side detection voltage is configured to represent a voltage across a secondary winding of the flyback converter; and controlling the secondary-side rectifier switch to turn on when the slope parameter is ...
Auxiliary load application for increasing data rate of messages or for increasing the response speed ...
Dialog Semiconductor Inc.
November 30, 2017 - N°20170346411

A system and method of controlling the data transfer rate of a switching power converter when the switching frequency is below a desired level by using an auxiliary load to at least maintain output regulation.
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Control circuit, control method and flyback converter
Silergy Semiconductor Technology (hangzhou) Ltd
November 23, 2017 - N°20170338729

In one embodiment, a control circuit can include: a voltage feedback circuit configured to obtain a voltage feedback signal that represents an output voltage of the power stage circuit; a set signal generator configured to output a set signal when a secondary current crosses zero or a voltage sampling signal reaches a valley value; a reset signal generator configured to ...
Auxiliary winding ground fault detection for isolated dc/dc converter
Silergy Semiconductor Technology (hangzhou) Ltd
November 02, 2017 - N°20170317600

A flyback converter is provided with a controller that is configured to analyze the reflected feedback voltage waveforms to determine the presence of a ground connection fault for the auxiliary winding.
Power supply having high power factor and low standby power consumption
Silergy Semiconductor Technology (hangzhou) Ltd
November 02, 2017 - N°20170317578

A power supply circuit includes: an anti-electromagnetic interference circuit configured to receive input alternating current power and to output filtered alternating current power; a rectifier circuit configured to rectify the filtered alternating current power; a current correction circuit configured to perform passive power factor correction on the rectified alternating current power; a single-ended flyback converter circuit coupled to the output ...
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Reusing electromagnetic energy from a voltage converter downhole
Halliburton Energy Services, Inc.
September 21, 2017 - N°20170271992

A biasing circuit for a flyback converter can include a rectifier electrically coupled to an inductor of the flyback converter for generating a direct current signal from an alternating current signal outputted by the inductor in response to the inductor transferring an amount of energy to another inductor. The biasing circuit can also include a storage device electronically coupled to ...
Active clamp flyback converter
Fairchild Korea Semiconductor Ltd.
September 14, 2017 - N°20170264206

An active clamp flyback converter includes a low-side switch that serves as a power switch and a high-side switch that serves as a clamp switch. The high-side switch is operated in one of two active clamp switching modes, which is selected based on load condition. In a complementary active clamp mode, the switching frequency of the low-side switch is decreased ...
Dimming circuit, control circuit and dimming method
Silergy Semiconductor Technology (hangzhou) Ltd
August 31, 2017 - N°20170251535

A dimming circuit for adjusting the brightness of an led load, can include: a primary controlled flyback converter having a primary-side circuit, a first secondary-side circuit, and a second secondary-side circuit; a dc-dc converter coupled in a cascade arrangement with the second secondary-side circuit, where an output node of the dc-dc converter is coupled in series to an output node ...
Systems and methods of operation for power converters having series-parallel mode active clamps
Apple Inc.
August 24, 2017 - N°20170244316

Systems and methods for operating improved flyback converters are disclosed, in which leakage energy is returned to the input power source rather than to the output load, while still achieving zero voltage switching (i. E., zvs) operation. In some embodiments, the improved converters may transfer the energy stored in the leakage inductance to a snubber capacitor(s) at the instant ...
Self-tuning adaptive dead time control for continuous conduction mode and discontinuous conduction mode operation of ...
Fairchild Semiconductor Corporation
August 03, 2017 - N°20170222569

A flyback converter includes a primary-side switch that controls conduction of current on a primary side of a transformer and a synchronous rectifier on a secondary side of the transformer. A synchronous rectifier driver controls the conduction of the synchronous rectifier by adaptively adjusting a turn-off threshold of the synchronous rectifier.
Control circuit having adaptive blanking time and method for providing the same
Silergy Semiconductor Technology (hangzhou) Ltd
July 27, 2017 - N°20170214326

A control circuit can include: a blanking time control circuit configured to generate a blanking control signal according to a peak current of a main switch of a power stage circuit of a flyback converter; a sampling time control circuit configured to generate a sampling time control signal according to the blanking control signal and a feedback voltage signal; and ...
Power supply apparatus
Lite-on Technology Corp.
July 13, 2017 - N°20170201179

A power supply apparatus includes a flyback converter and a controller. The controller generates, in response to an output voltage generated by the flyback converter and stabilized at a selected one of a plurality of voltage values, a control signal associated with the selection of the voltage values. Based at least on the output voltage and the control signal, the ...
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Power converter for a switching power supply and manner of operation thereof
Champion Microelectronic Corporation
June 22, 2017 - N°20170179832

A switching power supply comprises a power converter that includes a transformer, a low side switch and a high side switch. The low side switch draws current from a supply voltage through a primary winding of the transformer. The high side switch discharges current from the primary winding of the transformer to a snubber capacitor. The controller synchronously controls the ...
Zero voltage switching flyback converter
Dell Products L.p.
June 22, 2017 - N°20170179831

A zero voltage switching method for a flyback converter featuring a transformer with first and second primary windings and corresponding turns ratios, n1 and n2, includes rectifying and filtering an ac signal to produce a primary dc voltage. A voltage level signal indicating whether the primary dc voltage falls within a particular voltage range is generated. The voltage level signal ...
Power supply
Noble Corporation
June 15, 2017 - N°20170170720

A power supply circuit includes: an anti-electromagnetic interference circuit configured to receive input alternating current power and to output filtered alternating current power; a rectifier circuit configured to rectify the filtered alternating current power; a current correction circuit configured to perform passive power factor correction on the rectified alternating current power; a single-ended flyback converter circuit coupled to the output ...
Device and method for determining a voltage
Robert Bosch Gmbh
May 18, 2017 - N°20170138987

The invention relates to a device and to a method for determining a voltage. The voltage to be determined is a direct voltage at the input of a flyback converter. The flyback converter comprises at least a flyback-converter transformer and a switching element on the primary side of the flyback-converter transformer. In order to determine the voltage at the input ...
Ac-dc power converters with improved voltage output level transitions
Apple Inc.
May 04, 2017 - N°20170126133

This disclosure relates to power converters that are capable of providing smooth transitions between multiple output voltage levels. The converter's output may need to be changed from, e. G., 5v to 12v, 15v, or 20v—based on the charging device's request. By using improved power converter designs comprising both a flyback converter circuit and variable-frequency buck converter circuit that ...
Control method and device for quasi-rosonant high-power-factor flyback converter
Stmicroelectronics S.r.l.
April 27, 2017 - N°20170117814

The present disclosure is directed to a high power factor quasi resonant converter. The converter converts an ac power line input to a dc output to power a load, generally a string of leds. The power input is fed into a transformer being controlled by a power switch. The power switch is driven by a controller having a shaping circuit. ...
Delta-sigma modulation for power converter control
Infineon Technologies Austria Ag
April 27, 2017 - N°20170117812

A flyback converter is described that in some examples includes an integrated circuit that includes a delta-sigma converter and a cascaded integrator-comb filter configured to determine: a proportional factor, an integral factor, and a derivative factor associated with a secondary-side voltage across a secondary-side winding of the converter. The integrated circuit uses each factor to control a secondary switching element ...
Tapped winding flyback converter for multiple output voltages
Apple Inc.
March 30, 2017 - N°20170093290

This disclosure relates to power converters capable of providing multiple output voltage levels. With respect to usb-c adapter design, the converter's output may need to be changed between different voltage levels, e. G., a low voltage (such as 5v, 10v), an intermediate voltage (such as 12v, 20v), or a high voltage (such as 20v, 40v)—based on the charging ...
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