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Flyback Converter patents

      

This page is updated frequently with new Flyback Converter-related patent applications.




 Tapped winding flyback converter for multiple output voltages patent thumbnailTapped winding flyback converter for multiple output voltages
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 device's request.
Apple Inc.


 High efficiency primary and secondary bias flyback converter with dual outputs patent thumbnailHigh efficiency primary and secondary bias flyback converter with dual outputs
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.
Apple Inc.


 Control  employing primary side regulation in a quasi-resonant ac/dc flyback converter patent thumbnailControl employing primary side regulation in a quasi-resonant ac/dc flyback converter
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.
Stmicroelectronics S.r.l.


 Dc-dc flyback converter with primary side auxiliary voltage output patent thumbnailDc-dc flyback converter with primary side auxiliary voltage output
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.
Osram Sylvania Inc.


 Flyback converter patent thumbnailFlyback converter
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 state during a first time period and during a second time period which follows the first time period, and such that a current flowing through the secondary winding has a direction during the second time period opposite to that during the first time period.. .
Lite-on Technology Corp.


 Flyback converter output current evaluation circuit and evaluation method patent thumbnailFlyback converter output current evaluation circuit and evaluation method
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.
Alpha And Omega Semiconductor (cayman) Ltd.


 Transformer, flyback converter and switching power supply with the same patent thumbnailTransformer, flyback converter and switching power supply with the same
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 primary winding coupled between a second terminal of the power switch and a primary grounding terminal, where a dotted terminal of the second primary winding is coupled to the primary grounding terminal; a secondary winding configured between the first and second primary windings in a radial direction of a magnetic core, where the first primary winding, the second primary winding, and the secondary winding are wound around the magnetic core; and a secondary rectifier and filter circuit coupled with the secondary winding, and configured to generate a stable current/voltage.. .
Silergy Semiconductor Technology (hangzhou) Ltd


 Led luminaire driving circuit and method patent thumbnailLed luminaire driving circuit and method
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 to provide a first illumination responsive to a power signal on the second output when the first secondary electronically controlled switch is in a closed state and not provide the first illumination when the first secondary electronically controlled switch is in the open state, wherein the turns ratio of the first secondary winding and the second secondary winding is such that power is delivered to the first output via the first unidirectional electronic valve only when the first secondary electronically controlled switch is switched to the open state..
Microsemi Corporation


 Flyback converter with secondary side regulation patent thumbnailFlyback converter with secondary side regulation
Disclosed examples include flyback converters, control circuits and methods to facilitate secondary side regulation of the output voltage. A primary side control circuit operates a primary side switch to independently initiate power transfer cycles to deliver power to a transformer secondary winding in a first mode.
Texas Instruments Incorporated


 Dead time compensation for synchronous rectifiers in adaptive output powers patent thumbnailDead time compensation for synchronous rectifiers in adaptive output powers
A synchronous rectifier controller for an adaptive output power converter is provided. The synchronous rectifier controller includes a voltage detection circuit, a threshold generation circuit, and a driver.
Fairchild (taiwan) Corporation


Systems and methods of operation for power converters having series-parallel mode active clamps

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 of turning off of the control switch.
Apple Inc.

Power control module with improved start requirements

Circuits and devices are described that provide power to appliances and other devices via a power correction circuit and an llc converter, which may for example include resonant series converters and flyback converters. The circuits and devices economize on board space, part size and power start up time by separately powering up the controller circuit portion prior to powering up the llc converter..
Sanken Electric Co., Ltd.

Pfm scheme for boost and flyback converter in led backlight application

This application relates to systems, methods, and apparatus for controlling a switching frequency of a boost or flyback converter to be above an audible frequency range when operating the boost or flyback converter in a pulse frequency modulation (pfm) mode. The boost or flyback converter uses one or more switches for converting power for a display panel.
Apple Inc.

Enhanced flyback converter

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.
Ohio State Innovation Foundation

Switched mode power supply with efficient operation at light loads and method therefor

A switched mode power supply includes an active clamp flyback converter having an input for receiving an input voltage, and an output for providing a regulated voltage, the active clamp flyback converter having a first switch for controlling a flow of current through a primary winding of a flyback transformer, and a second switch for clamping a switch node on a primary side of the flyback transformer, and a controller for controlling the first and second switches to operate the active clamp flyback converter in an active clamp flyback mode when a load current is above a first predetermined level, and for controlling the first and second switches to operate the active clamp flyback converter in a discontinuous conduction mode with a variable switching frequency when the load current is below a second predetermined level.. .
Semiconductor Components Industries, Llc

Constant power supply for led emergency lighting using smart output resetting circuit for no load conditions

A constant power backup power supply for led lighting fixtures is disclosed. The power supply includes a storage battery that is charged while an ac power source is in an on condition.
Iota Engineering, Llc

Reduced flicker driver circuit for led systems

Led systems and circuits for generating a driver output for powering one or more led devices are provided. A dimmable driver circuit can include a controller configured to reduce output ripple current to reduce flicker over the dimming range of the led system.
Hubbell Incorporated

Dual ac and dc output flyback converter and associated systems and methods

Exemplary embodiments of flyback converters are provided. The flyback converters include a voltage input, a flyback transformer including a primary winding circuitry, and first and second secondary winding circuitries.
University Of Connecticut

Flyback converter, control circuit and control method therefor

The disclosure relates to a flyback converter, a control circuit and a control method therefor. In the control method, a power stage circuit is controlled at a light load to operate alternatively in a pulse width modulation mode (i.e.
Silergy Semiconductor Technology (hangzhou) Ltd.

Circuit arrangement

The invention relates to a circuit arrangement (1), in particular for controlling an electric machine, comprising at least one high-voltage semiconductor bridge circuit (2) that includes a low-side semiconductor switch (4) and a high-side semiconductor switch (3). A high-side gate driver (5) is assigned to the high-side semiconductor switch (3), and a low-side gate driver (6) is assigned to the low-side semiconductor switch (4).
Robert Bosch Gmbh

Control circuit, control method and flyback converter of primary-side feedback control thereof

The disclosure relates to a control circuit, a control method and a flyback converter of primary-side feedback control including the control circuit. On the basis of the current sampling signal feedback, the flyback converter of primary-side feedback control is controlled to operate in a constant on time mode when the input voltage is large, and is controlled to operate in a peak current mode when the input voltage is close to a valley.
Silergy Semiconductor Technology (hangzhou) Ltd.

Control circuit, control method and flyback converter

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 output a reset signal in a constant on time mode when the voltage feedback signal is greater than a first voltage threshold value, and to output the reset signal in a peak current mode when the voltage feedback signal is less than the first voltage threshold value; and a logic circuit configured to activate a switching control signal according to the set signal, and to deactivate the switching control signal according to the reset signal.. .
Silergy Semiconductor Technology (hangzhou) Ltd

Pulse-width modulation (pwm) controlling flyback converter

A pulse-width modulation (pwm) controlling apparatus includes a valley detector configured to detect a valley of an auxiliary winding voltage of a flyback converter, an output voltage controller configured to output a first pwm control signal by performing averaging and sampling of the auxiliary winding voltage, an output current controller configured to output a second pwm control signal by performing an average current mode method on a current signal (cs) voltage, a latch configured to output a gate control signal after being supplied with the result of a logical or operation of the first pwm control signal output by the output voltage controller and the second pwm control signal output by the output current controller, or an output signal of the valley detector, and a gate controller configured to perform a turning-on or turning-off operation of a first switch based on the gate control signal.. .
Magnachip Semiconductor, Ltd.

Circuit and driving synchronous rectifiers for high-frequency flyback converters

A voltage waveform similar to a waveform of a magnetizing current of an isolation transformer and immune to high frequency oscillatory resonant behavior is developed across a capacitor of a series resistor and capacitor connection connected in parallel with a synchronous rectifier. A simple logic circuit produces a waveform for controlling the synchronous rectifier which is not subject to significant turn on delay or early turn off caused by oscillatory resonances among parasitic inductances and capacitances.
Virginia Tech Intellectual Properties, Inc.

Method and device for high-power-factor flyback converter

The present disclosure is directed to a switching power converter having a power transistor controlled by a controller. The controller includes a multiplier that produces a voltage reference signal.
Stmicroelectronics S.r.l.

Secondary controller for use in synchronous flyback converter

A secondary controller for use in a power converter includes a drive circuit coupled to a secondary side of the power converter. The drive circuit is coupled to generate a first signal to enable a first switch coupled to a primary side of the primary converter.
Power Integrations, Inc.

Control for quasi-resonant high-power-factor flyback converter

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.
Stmicroelectronics S.r.l.

Soft switching flyback converter

Disclosed examples include synchronous rectifiers and flyback converters, integrated circuits and operating methods, in which a first switch is turned on to allow current to flow for a first time period in a first direction in a transformer primary winding responsive to a first switch voltage transitioning below a first threshold, and a second switch is turned on for a second time period after the first time period to transfer energy from a secondary transformer winding to drive a load. In the same converter cycle, the second switch is again turned on for a third time period in response to a second switch voltage transitioning below a second threshold at one of a series of troughs of a resonant ringing voltage waveform across the second switch, to cause current flow in a second direction in the primary winding to discharge a capacitance of the first switch to cause the first switch voltage to transition below the first threshold to initiate a subsequent converter cycle..
Texas Instruments Incorporated

Dc-dc power converter for use in data communications distributed power architecture

A dc-dc power converter is for use in data communications and for connection between a front end ac-dc power supply and a point-of-load circuit. The dc-dc power converter includes either an unregulated flyback converter or an unregulated buck converter.
Astec International Limited

Knee voltage detector

A knee voltage detector for a flyback converter is provided. The knee voltage detector comprises a delay unit, for delaying an auxiliary related voltage for a specific period, to generate a delay signal; a subtracting unit, for generating a subtraction signal according to the auxiliary related voltage and the delay signal; a comparing unit, for generating a sampling signal when the subtraction signal indicates that a voltage difference between the auxiliary related voltage and the delay signal is greater than a threshold; and a sample and hold unit, for sampling the delay signal to generate a knee voltage according to the sampling signal when the voltage difference between the auxiliary related voltage and the delay signal is greater than the threshold..
Novatek Microelectronics Corp.

Led driver circuit using flyback converter to reduce observable optical flicker by reducing rectified ac mains ripple

The present application describes a driver circuit for supplying a drive current to an led lighting scheme. In particular, the present invention relates to an ac input driver circuit operable in conjunction with a current regulator device which utilizes a plurality of zener diodes connected in parallel combinations.
Accuric Ltd

Shoot-through prevention in switched-mode power supplies

The disclosed embodiments provide a system that operates a flyback converter. During activation of a synchronous rectifier (sr) controller on a secondary side of the power converter, the system temporarily disables driving of a gate of a metal-oxide-semiconductor field-effect transistor (mosfet) by the sr controller to enable synchronization of the sr controller to a switching frequency on a primary side of the power converter.

Flyback converter output current evaluation circuit and evaluation method

An output current calculating circuit for a flyback converter operating under ccm and dcm is disclosed. The off current value ion 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.

System and zero voltage switching in continuous conductance mode (ccm) flyback converters

It is possible to achieve zero-voltage switching in continuous conductance mode (ccm) flyback converters by reducing the voltage differential across the primary winding immediately prior to transitioning the primary circuit from the off-state to the on-state. In one example, the voltage differential is reduced to the extent that polarity across the primary winding is reversed.

Low voltage environment controller with power factor correction flyback power supply

The present environment controller is adapted for being powered in low-voltage daisy-chained power configuration. The environment controller comprises a low-voltage daisy-chainable power supply comprising a power factor conversion (pfc) flyback converter.

Circuit and evaluation overload condition in flyback converter

A circuit and a method for evaluating a load condition in a flyback converter are disclosed. A first current source is used for providing a preset current isum equal to a sum of the off current value ioff and the blanking current value ileb to charge a first capacitor, and a second current source is used for providing a reference current iref to charge a second capacitor.

Control employing primary side regulation in a quasi-resonant ac/dc flyback converter

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.
Stmicroelectronics S.r.l.

Flyback converter operating by synchronous rectification with transient protection, primary side control circuit therein, and control method thereof

The present invention discloses a flyback converter, a primary side control circuit therein, and a control method thereof. The flyback converter includes: a transformer circuit, a power switch circuit, a primary side control circuit, a synchronous rectification (sr) switch, and a synchronous rectification (sr) control circuit.
Richtek Technology Corporation

Regulation of the power supply voltage for a flyback converter controller

A switching power converter is provided that includes a detector to detect whether a controller power supply voltage has fallen below a threshold voltage during a dormant period in which a power switch is no longer cycling to deliver power to a load. In response to a detection of such a threshold crossing by the detector, a controller powered by the controller power supply voltage is configured to cycle the power switch to replenish the controller power supply voltage..
Dialog Semiconductor

Adaptive bjt driver for switching power converter

A flyback converter is provided that includes a base driver for driving a base current into a base of a bjt power switch. The base driver is controlled so as to adaptively vary the base current across at least some of the pulses..
Dialog Semiconductor Inc.

Partial time active clamp flyback

A method is shown to improve the resonant transition controlled flyback converter presented in ser. No.
Rompower Energy Systems, Inc.

Reducing switching losses in flyback converters

The disclosed embodiments present a flyback voltage converter that reduces switching losses in a primary-side switching transistor. This flyback converter includes a primary current path that feeds from an input power source into a voltage input of the flyback converter, then through a primary winding of a transformer and a primary transistor to a primary ground.
Apple Inc.

Synchronous rectification control circuit and power supply thereof

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.. .
Silergy Semiconductor Technology (hangzhou) Ltd

Measuring input voltages from reference windings of power converters with limited on-time

The disclosed embodiments provide a system that operates switched-mode power supplies, such as flyback converters. The power supplies may comprise isolated or non-isolated power converters.
Apple Inc.

Synchronous rectification for flyback converter

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.
Infineon Technologies Austria Ag

Flyback converter

According to one aspect, embodiments herein provide a flyback converter comprising an input, an output, a rectifier, a transformer having a primary winding and a secondary winding, a switch, the switch being closed in a first mode of operation and open in a second and third mode of operation, and a regenerative snubber circuit, wherein the flyback converter is configured such that in the first mode of operation, the dc power from the rectifier charges the transformer, wherein the flyback converter is configured such that, in the second mode of operation, the snubber circuit is configured to store leakage energy from the primary winding, and wherein the flyback converter is configured such that, in the third mode of operation, the snubber circuit is configured to provide the stored energy to the primary winding. The flyback converter may also have high power factor at the input while operating from ac input..
Schneider Electric It Corporation

Converter and controlling the same

A method for controlling converter such as a flyback converter is disclosed. A load of the flyback converter varies between zero and a peak value.
Delta Electronics (shanghai) Co., Ltd.

Method and providing power conversion using an interleaved flyback converter with automatic balancing

Method and apparatus for converting dc input power to dc output power. In one embodiment, the apparatus comprises a plurality of flyback circuits, coupled in parallel, for providing dc-to-dc conversion; and a controller for automatically adjusting activation timing of each flyback circuit in said plurality of flyback circuits to achieve a balanced operation..
Enphase Energy, Inc.

Low forward voltage rectifier

A low forward voltage rectifier (lfvr) includes a bipolar transistor, a parallel diode, and a base current injection circuit disposed in an easy-to-employ two-terminal package. In one example, the transistor is a reverse bipolar junction transistor (rbjt), the diode is a distributed diode, and the base current injection circuit is a current transformer.
Ixys Corporation

Control circuit, control method and primary-controlled flyback converter using the same

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 control signal generator that generates a switch control signal according to the voltage sense signal and the current sense signal; and (iv) the switch control signal being configured to control a power switch of the power stage circuit, where the switch control signal is active during a constant on time.. .
Silergy Semiconductor Technology (hangzhou) Ltd

Power converters

A power converter comprising: an input portion; a forward converter output portion with a ripple steering element; and a flyback converter output portion with a ripple steering element, wherein the input portion, forward converter output portion and flyback converter output portion are combined in an isolated magnetic configuration sharing a single transformer.. .
Meggitt Us-scpl, Securaplane Technologies, Inc.



Flyback Converter topics:
  • Flyback Converter
  • Synchronous Rectifier
  • Synchronous
  • Feedback Signal
  • Modulation
  • Power Generation System
  • Sleep Mode
  • Computer System
  • Reference Voltage
  • Forward Converter
  • Duty Cycle
  • Voltage Stress
  • Hybrid Electric Vehicles
  • Hybrid Electric Vehicle
  • Electric Vehicle


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    This listing is a sample listing of patent applications related to Flyback Converter for is only meant as a recent sample of applications filed, not a comprehensive history. There may be associated servicemarks and trademarks related to these patents. Please check with patent attorney if you need further assistance or plan to use for business purposes. This patent data is also published to the public by the USPTO and available for free on their website. Note that there may be alternative spellings for Flyback Converter with additional patents listed. Browse our RSS directory or Search for other possible listings.


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