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Synchronous Rectifier

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


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Resonant rectifier circuit with capacitor sensing
Texas Instruments Incorporated
March 29, 2018 - N°20180090993

A wireless power transfer system using a resonant rectifier circuit with capacitor sensing. A wireless power transfer system includes a power receiver resonant circuit and a synchronous rectifier. The power receiver resonant circuit includes an inductor and a capacitor connected in series with the inductor. The synchronous rectifier is configured to identify zero crossings of alternating current flowing through the ...
Regulation circuit associated with synchronous rectifier providing cable compensation for the power converter and method ...
Semiconductor Components Industries, Llc
March 15, 2018 - N°20180074537

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 ...
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.
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Adaptive turn-off trigger blanking for synchronous rectification
Fairchild Semiconductor Corporation
February 15, 2018 - N°20180048241

A switching converter includes a synchronous rectifier and a synchronous rectifier driver that controls conduction of the synchronous rectifier. The synchronous rectifier driver turns off the synchronous rectifier in response to a turn-off trigger. The synchronous rectifier driver prevents the turn-off trigger from turning off the synchronous rectifier during a turn-off trigger blanking time that is adaptively set based on ...
Power converter and control method therefor
Semiconductor Components Industries, Llc
December 28, 2017 - N°20170373607

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 ...
Communication circuit for flyback power converter with synchronous rectifier
Semiconductor Components Industries, Llc
December 28, 2017 - N°20170373606

A method for communicating with a power converter comprises initiating a communication sequence by sensing a first distortion of a sensed waveform during a discharge period of a first power transfer cycle of the power converter. The sensed waveform is proportional to a secondary current of the power converter. At a primary side of the power converter, a data bit ...
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System for synchronous rectifier voltage regulator shoot-through detection
Dell Products, Lp
December 14, 2017 - N°20170357309

A method, circuit, and information handling system detect an assertion of a low side gate driver signal of a low side gate driver coupled to a low side gate of a low side selectively conductive device, to obtain a reference voltage value, to detect a local high side positive supply voltage at a high side positive supply voltage terminal of ...
Switching control circuit with signal process to accommodate the synchronous rectifier of power converters
Semiconductor Components Industries, Llc
November 23, 2017 - N°20170338749

A switching control circuit of a power converter according to the present invention comprises an input circuit and a clock generator. The input circuit is coupled to receive a feedback signal for generating a switching signal. The clock generator generates a clock signal to determine a switching frequency of the switching signal. The feedback signal is correlated to an output ...
Synchronous rectifier
November 02, 2017 - N°20170317602

Disclosed is a method to control the synchronous rectification in a power converter including a primary winding and a secondary winding, including detecting a peak current in a secondary winding, determining a blanking threshold based on the peak current, and blanking a turning off of a synchronous rectifier (sr) switch for a blanking time based on the blanking threshold.
Digitalized double-excitation uninterrupted switching power supply
November 02, 2017 - N°20170317524

A digitalized double-excitation uninterrupted switching power supply comprises a main transformer provided with a primary coil and a secondary coil, a main loop, a synchronous rectification output loop, a synchronous direct-current converter and a digital control unit, wherein the main loop comprises a high-voltage switching network, a resonant inductor, the primary coil and a resonant capacitor. The synchronous rectification output ...
Self supply for synchronous rectifiers
Infineon Technologies Austria Ag
October 26, 2017 - N°20170310230

A power converter with an isolated topology may include a primary side and a secondary side. The secondary side includes a self-powered synchronous rectifier. The synchronous rectifier includes a synchronous rectifier transistor having at least a drain and a gate, a voltage regulator having at least an input that is coupled to the drain of the synchronous rectifier transistor, and ...
Synchronous rectifier circuit and control method thereof
October 19, 2017 - N°20170302193

A synchronous rectifier circuit can include: a full-bridge rectifier circuit having first, second, third, and fourth switches, where a common node of the first and fourth switches is configured as a first input terminal of the synchronous rectifier circuit, and a common node of the second and third switches is configured as a second input terminal of the synchronous rectifier ...
Synchronous rectifier for buck converter without the need for a comparator
Dialog Semiconductor (uk) Limited
October 12, 2017 - N°20170294839

A switch mode power supply, which functions in a continuous current mode and a discontinuous mode employing a zero crossing control circuit for determining a polarity of an inductor current and from the polarity of the inductor current, controlling an operational state of a switching section of the switch mode power supply such that the inductor current becomes approximately zero ...
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Voltage discharge circuit
Microsoft Technology Licensing, Llc
October 05, 2017 - N°20170288558

Technologies are described for an adaptable power supply that can switch between two or more output voltages. The power supply includes discharge circuitry that utilizes the secondary windings of a transformer as a discharge path when the power supply switches from a high voltage level to a low voltage level. In some embodiments, the discharge circuitry is included within a ...
Secondary control device and charging system having the same
Byd Company Limited
October 05, 2017 - N°20170288440

A secondary control device and a charging system are provided. The secondary control device is connected with a transformer having a secondary winding connected with a charging interface, and includes: a secondary rectifier switch connected with the secondary winding; a secondary synchronous rectifier chip connected with the secondary winding and the secondary rectifier switch, and configured to detect a voltage ...
Isolated synchronous rectification control circuit, control device, and control method
Wuxi Chip Hope Micro-electronics Ltd
September 21, 2017 - N°20170272001

The present invention provides an isolated synchronous rectification control circuit, a control device, and a control method. The control circuit includes a power supply module, a reference module, a comparator module, a primary side turn-on determination unit, a secondary intermittent burst estimation unit, a logic unit, and a driver unit. The control device includes a transformer, a bypass capacitor configured ...
High frequency multi-level rectification
Qualcomm Incorporated
September 07, 2017 - N°20170256958

A multi-level rectifier is presented that is suitable for use at high frequencies, including into mhz range such as in the 6. 78 mhz band used for wireless power transfer. To maintain the proper timing or switching waveform when operating at high frequencies, a feedback loop is used. The rectification circuit includes a multi-level waveform generator circuit that generates a multi-level control ...
Multi-impedance rectification for wireless power transfer
Qualcomm Incorporated
September 07, 2017 - N°20170256956

A multi-level rectifier is presented that is suitable for use at high frequencies, including into mhz range such as in the 6. 78 mhz band used for wireless power transfer. Depending on the amplitude of the input waveform, the rectifier can be operated in different modes. For lower input levels, the rectifier acts as a voltage doubler. For higher input levels, the ...
System and method for controlling a synchronous rectifier
Toyota Motor Engineering & Manufacturing North America Inc.
August 31, 2017 - N°20170250615

A power system includes dc-dc power conversion circuitry that has a first switch and a second switch on either side of a transformer, and the second switch is operates as a synchronous rectifier. Power transfer from a primary side to secondary side of the dc-dc power conversion circuitry is controlled by operating the first switch. A drive signal for the ...
Gate pre-positioning for fast turn-off of synchronous rectifier
Fairchild Semiconductor Corporation
August 24, 2017 - N°20170244333

A synchronous rectifier driver pre-positions a gate of a synchronous rectifier to allow for fast turn-off. The synchronous rectifier driver turns on the synchronous rectifier by driving the gate at a high level for a period of time that is based on a previous conduction time of the synchronous rectifier. The synchronous rectifier driver thereafter drives the gate at a ...
Devices, systems, and methods for adjusting output power using synchronous rectifier control
Qualcomm Incorporated
August 24, 2017 - N°20170244254

Methods and apparatus are disclosed for wirelessly receiving power. In one aspect, an apparatus for wireless receiving power is provided. The apparatus comprises a receive circuit configured to receive wireless power via a magnetic field sufficient to power or charge a load. The apparatus further comprises a synchronous rectifier electrically coupled to the receive circuit, the synchronous rectifier comprising a ...
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