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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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Power converter for a switching power supply and manner of operation thereof
Champion Microelectronic Corporation
October 05, 2017 - N°20170288551

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 ...
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 ...
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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 ...
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Control circuit, control method and primary-controlled flyback converter using the same
Silergy Semiconductor Technology (hangzhou) Ltd
June 29, 2017 - N°20170187295

In one embodiment, a control circuit configured to control a power stage circuit of a primary-controlled flyback converter, can include: (i) a current sense circuit that generates a current sense signal by sampling a primary current; (ii) a voltage sense circuit that generates a voltage sense signal by sampling an auxiliary voltage after a blanking time has elapsed; (iii) a ...
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. ...
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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 ...
High efficiency primary and secondary bias flyback converter with dual outputs
Apple Inc.
March 30, 2017 - N°20170093289

This disclosure relates to flyback transformer-based power converters that are capable of providing multiple output voltage levels. With respect to usb-pd adapter design, the flyback converter's output may be changed from 12v to 20v—based on the charging device's request. By using a bias circuit that monitors an output voltage level of the flyback converter, a bias voltage for ...
Control method and device employing primary side regulation in a quasi-resonant ac/dc flyback converter
Stmicroelectronics S.r.l.
March 02, 2017 - N°20170063242

The present disclosure is directed to a primary-controlled 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, and may be compatible with phase-cut dimmers. The power input is fed into a transformer being controlled by a power switch. The power switch is ...
Dc-dc flyback converter with primary side auxiliary voltage output
Osram Sylvania Inc.
March 02, 2017 - N°20170063240

A dc-dc flyback converter includes a transformer and a switching component connected between the transformer and a ground. The switching component controls current flow through the primary winding of the transformer. A snubber circuit is connected between ground and the connection between the transformer and the switching component. The snubber circuit reduces transient voltage spikes across the switching component. A ...
Flyback converter
Lite-on Technology Corp.
March 02, 2017 - N°20170063213

A flyback converter includes: a transformer including a primary winding and a secondary winding; a first switch coupled to the primary winding; a first control module configured to control the first switch; a second switch coupled to the secondary winding; and a second control module configured to control the second switch, such that the second switch operates in an on ...
Flyback converter output current evaluation circuit and evaluation method
Alpha And Omega Semiconductor (cayman) Ltd.
February 16, 2017 - N°20170047853

An output current calculating circuit for a flyback converter operating under ccm and dcm is disclosed. The off current value ioff and the blanking current value ileb flowing through a sensing resistor are calculated using a detection module and are summed together using a current summing unit. A voltage converted from the sum value of the off current value ioff ...
Transformer, flyback converter and switching power supply with the same
Silergy Semiconductor Technology (hangzhou) Ltd
February 16, 2017 - N°20170047848

A flyback converter can include: a power switch controlled to be turned on/off to control a current through a primary side; a first primary winding coupled between an input terminal and a first terminal of the power switch, where a dotted terminal of the first primary winding is coupled to a first terminal of the power switch; a second ...
Led luminaire driving circuit and method
Microsemi Corporation
February 09, 2017 - N°20170041995

A flyback converter is provided with a first output associated with a first secondary winding, a primary side controller arranged to maintain the first output at a predetermined voltage level and a second output associated with a second secondary windings; an led controller. A first secondary electronically controlled switch is responsive to the led controller; a first led luminaire arranged ...
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