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Control circuit and control method of synchronous rectifier

A technology of synchronous rectifiers and control circuits, which is applied to electrical components, high-efficiency power electronic conversion, and output power conversion devices. The effect of loading efficiency

Active Publication Date: 2010-04-07
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a synchronous rectifier control circuit and control method to solve the problems of low efficiency and inaccurate switching time control in the prior art

Method used

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  • Control circuit and control method of synchronous rectifier
  • Control circuit and control method of synchronous rectifier
  • Control circuit and control method of synchronous rectifier

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Embodiment Construction

[0053]Several preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to these embodiments. The present invention covers any alternatives, modifications, equivalent methods and schemes made on the spirit and scope of the present invention. In order to provide the public with a thorough understanding of the invention, specific details are set forth in the following preferred embodiments of the invention, without which the invention can be fully understood by those skilled in the art. In addition, well-known methods, procedures, procedures, components, circuits, etc. have not been described in detail in order to avoid unnecessary confusion to the essence of the present invention.

[0054] The content of the present invention will be described below in the form of processes, processes, logic modules, functional modules, processing, circuit diagrams, codes, data bits, dat...

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Abstract

The present invention relates to a control circuit and a control method of a synchronous rectifier. In a preferred embodiment according to the invention, the synchronous rectifier control circuit comprises the following components: (1) a first detection circuit which is used for detecting a voltage between a first power terminal and a second power terminal before the device is switched on and generating a first control signal for regulating the switching-on time of the synchronous rectifier; (2) a second detection circuit which is used for detecting a voltage between the first power terminal and the second power terminal after the device is switched off and generating a second control signal for regulating the switching-off time of the device; and (3) a driving control circuit which receives the first control signal and the second control signal and generating a grid control signal for driving a control terminal of the synchronous rectifier.

Description

technical field [0001] The invention relates to the field of semiconductor devices, in particular to a synchronous rectifier in a switching power supply using a power transformer. Background technique [0002] Voltage regulators, such as DC-DC voltage converters, are used to provide a stable voltage source for a wide variety of electronic device systems. High-efficiency DC-DC converters are especially needed for power supplies for low-voltage devices such as laptops, cell phones, etc. A switching voltage regulator generates an output voltage by converting an input DC voltage into a high-frequency voltage and then filtering the output DC voltage. A switching regulator includes a switch that periodically connects and disconnects an input DC voltage source to power a load (such as an integrated circuit). An output filter consisting of inductors and capacitors is connected between the input voltage source and the load to filter the switching output to provide an output DC volt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/02H02M7/217
CPCY02B70/1475H02M3/33592Y02B70/10
Inventor 陈伟
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD
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