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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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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 ...
System and method for bidirectional wireless power transfer
Access Business Group International Llc
October 12, 2017 - N°20170294807

The present invention relates to a wireless power supply system including a remote device capable of both transmitting and receiving power wirelessly. The remote device includes a self-driven synchronous rectifier. The wireless power supply system may also include a wireless power supply configured to enter an off state in which no power, or substantially no power, is drawn, and to ...
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 ...
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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 ...
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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 ...
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.
Adaptive turn-off trigger blanking for synchronous rectification
Fairchild Semiconductor Corporation
August 03, 2017 - N°20170222568

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 ...
Synchronous rectifier applied to a power converter and operation method thereof
Leadtrend Technology Corp.
July 20, 2017 - N°20170207715

A synchronous rectifier applied to a power converter includes a power supply module, a control module, and a gate driving unit. The power supply module is used for generating a supply current according to an induced voltage generated from a secondary side of the power converter, wherein the supply current is used for establishing a supply voltage, and the induced ...
Self-driven ac-dc synchronous rectifier for power applications
City University Of Hong Kong
June 22, 2017 - N°20170179846

Systems, methods, and devices that employ self-driven gate-drive circuitry to facilitate controlling power switches to emulate a diode bridge to synchronously rectify a power signal are presented. A single-phase or multi-phase synchronous rectifier can comprise at least a first pair of switches of a first conducting path and a second pair of switches of a second conducting path that can ...
Control of asymmetric parallel synchronous rectifiers in power converter topologies
Infineon Technologies Austria Ag
June 08, 2017 - N°20170163159

A power converter includes an input power source, a synchronous rectifier and a controller. The synchronous rectifier includes a plurality of actively controlled switches coupled in parallel and configured to rectify current delivered from the input power source to a load. The controller is operable to issue a first control signal for driving a first one of the actively controlled ...
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High speed synchronous rectifier
Fairchild (taiwan) Corporation
May 25, 2017 - N°20170149353

A control circuit and method for a synchronous rectifier having a plurality of switches and receiving an ac input signal. The control method includes switching between controlling a first switch of the plurality of switches in response to a control signal for a second switch of the plurality of switches, controlling the first switch in response to a comparison between ...
Wireless power transfer receiver having synchronous rectifier synchronized to wireless power transfer signal
Fairchild (taiwan) Corporation
May 25, 2017 - N°20170149282

An apparatus for wirelessly receiving power via a wireless field generated by a transmitter includes a resonator configured to generate electrical current to power or charge a load based on a voltage induced in the resonator in response to the wireless field, a controller configured to receive a synchronization timing reference signal based on a derivative of the voltage induced ...
System and method for improving efficiency for quasi-square wave power converters
Texas Instruments Incorporated
May 04, 2017 - N°20170126122

A power converter includes a power stage having a switch-node of a switched-mode power supply that is coupled to an input voltage node by a power field-effect transistor (fet) to energize an inductive circuit and is coupled to a ground node by a synchronous rectifier in parallel with the inductive circuit. The power converter also includes a controller coupled to ...
Driver circuit for synchronous rectifier switches in resonant converters, corresponding converter and method
Stmicroelectronics S.r.l.
March 23, 2017 - N°20170085188

A driver circuit for synchronous rectifier electronic switches, such as sr mosfets in resonant converters controls a pair of synchronous rectifier electronic switches to apply thereto a drive voltage to switch the synchronous rectifier electronic switches on and off synchronously with a converter current. The driver circuit includes a programming module to produce a first signal indicative of the figure ...
Synchronous rectifier applied to a power converter and operation method thereof
Leadtrend Technology Corp.
March 09, 2017 - N°20170070151

A synchronous rectifier applied to a power converter includes a gate coupling effect suppressing unit. The gate coupling effect suppressing unit is used for suppressing an induced voltage coupled to a gate of a metal-oxide-semiconductor transistor coupled to a secondary side of the power converter to ensure that the metal-oxide-semiconductor transistor is turned off when the power converter operates in ...
Adaptive synchronous rectifier control
Dialog Semiconductor Inc.
March 02, 2017 - N°20170063246

A switching power converter may include a power switch coupled to a primary winding of a transformer, and a primary controller configured to turn on and off the power switch, a synchronous rectifier switch coupled to a secondary winding of a transformer, and a synchronous rectifier controller configured to turn on and off the synchronous rectifier switch. The synchronous rectifier ...
Method and device for detecting conduction mode
Sync Power Corp.
February 16, 2017 - N°20170047851

A method and a device for detecting conduction mode is disclosed. The method uses an energy-storing element to connect with a synchronous rectifier and a load, and the load connects with the synchronous rectifier. Firstly, energy is discharged from the energy-storing element and applied to the load through the synchronous rectifier to periodically generate a detected voltage signal across the ...
Flyback converter with secondary side regulation
Texas Instruments Incorporated
February 02, 2017 - N°20170033698

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. A secondary side control circuit operates a synchronous rectifier or secondary side switch to ...
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