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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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Enhanced flyback converter
Ohio State Innovation Foundation
May 03, 2018 - N°20180123480

A dc/dc flyback converter that exhibits reduced switch and transformer voltage stresses in comparison to known flyback converters. The flyback converter also employs soft switching. Embodiments of such flyback converters may be used, without limitation, in electric vehicles and hybrid electric vehicles. A front-stage of the flyback converter comprises a dc/ac step-down circuit that may be separately used ...
Soft switching in flyback converters using a fixed dead time
Vignan's University
May 03, 2018 - N°20180123442

Soft switching in flyback converters using a fixed dead time is presented. Embodiments disclosed herein relate to switching circuits and more particularly to soft switching in single stage isolated flyback converters. Embodiments herein disclose systems for soft switching in single stage isolated flyback converters operating in boundary control mode, by incorporating a fixed dead time.
Multifunction electronic power supply for led lighting appliances
Beghelli S.p.a.
April 26, 2018 - N°20180116020

A multifunction electronic power supply for led lighting appliances. A series of interface ports or connectors, a block for filtering and measuring the voltage and current, connected to the main power supply, an auxiliary power supply, a microcontroller, a flyback converter with isolated output, a circuit for measuring the brightness, a light sensor, which detects the light reflected from the ...
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A flyback converter with a snubber circuit
Linak A/s
March 29, 2018 - N°20180091039

A flyback converter (21) for use in a power supply for an electric actuator system comprises a snubber circuit with a snubber capacitor (23) for accumulating energy stored in a leakage inductance of a flyback transformer (4) when a primary current (iprim) is switched off. The snubber circuit further comprises a controllable switching element (24) in series with the snubber capacitor (23) with a control ...
Led dimming with slow data channel transmission
Dialog Semiconductor (uk) Limited
March 22, 2018 - N°20180084615

An data transmission method is provided for transmitting analog data through an isolating device using a calibration input pulse and a data input pulse. The analog data may represent, for example, the desired dimming value for a flyback converter powering a solid state lighting system.
Systems and methods of operation for power converters having series-parallel mode active clamps
Apple Inc.
March 22, 2018 - N°20180083546

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 capacitors) at the instant of ...
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Flyback converter and controlling method thereof
March 22, 2018 - N°20180083541

Wherein np denotes a turns number of the primary winding, ns denotes a turns number of the secondary winding, and iini denotes an initial current value which is detected when the main switch is conducted.
Flyback converter
Navitas Semiconductor, Inc.
March 15, 2018 - N°20180076725

A converter circuit is disclosed. The converter circuit includes a transformer and a primary circuit connected to the primary side of the transformer, where the primary circuit includes a first switch connected to a ground. The converter circuit also includes a second switch connected to the first switch, and a clamping capacitor connected to the second switch and to the ...
Power limiting for flyback converter
Infineon Technologies Austria Ag
March 15, 2018 - N°20180076722

A controller of a power converter is described that after switching-on a primary switch of a power converter, detects a voltage that is indicative of a primary current through the primary switch and responsive to determining that the voltage exceeds a direct-current (dc) voltage threshold, switches-off the primary switch. The controller stores a peak value of the voltage while switching-off ...
Fixed frequency series-parallel mode (spm) active clamp flyback converter
Apple Inc.
March 08, 2018 - N°20180069478

A flyback converter can include a series-parallel mode (spm) active clamp circuit. The active clamp circuit, coupled in parallel with the primary coil, may include multiple networks in parallel. The first network, comprising a switch, one or more snubber capacitors, and one or more diodes, may be configured to absorb and retain the leakage energy from the leakage inductance of ...
Backup electrical supply for main capacitor discharge
Ford Global Technologies, Llc
March 08, 2018 - N°20180065489

A vehicle may include an electric drive system including switches having gates configured to control the switches. The vehicle may include a galvanic isolation coupling having a primary side electrically connected with an input power source and a secondary side electrically connected with a gate driver circuit. The gat driver circuit has a controller configured to actuate the gates and ...
Efficient power supply voltage regulation for synchronous rectifier controller
Dialog Semiconductor Inc.
March 01, 2018 - N°20180062530

A flyback converter is provided with a synchronous rectifier (sr) controller including a pulse linear regulator (plr) charging path and an ldo charging path. The sr controller is configured to monitor the switching period and/or duty cycle of a power switch in the flyback converter to select between the plr and ldo charging paths.
Control method and device for quasi-resonant high-power-factor flyback converter
Stmicroelectronics S.r.l.
February 15, 2018 - N°20180048239

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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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.
Dual-mode operation controller for flyback converter with primary-side regulation
Inno-tech Co., Ltd.
November 30, 2017 - N°20170346405

Disclosed is a dual-mode operation controller in collocation with an input capacitor, a flyback transformer, a first primary-side switch, a second primary-side switch, a current-sensing resistor, a primary-side voltage-sensing unit, a secondary-side rectifier, and an output capacitor as a primary-side regulation (psr) flyback converter, which is dynamically controlled to operate in two operating modes, including quasi-resonant-discontinuous conduction mode (qr-dcm) and ...
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
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
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 ...
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 ...
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