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Synchronous rectifying control method and circuit

A technology of synchronous rectification and control method, which is applied in the direction of control/regulation system, conversion of DC power input to DC power output, conversion of AC power input to DC power output, etc., which can solve the problem of large power loss, low efficiency, and switching time Inaccurate control and other issues to achieve the effect of reducing power loss, avoiding negative current, and high working efficiency

Active Publication Date: 2014-11-05
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide a new type of synchronous rectification control circuit and synchronous rectification control method to solve the problems of large power loss, low efficiency, inaccurate switching time control of synchronous rectifiers in the prior art and problems in light load state negative current problem

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  • Synchronous rectifying control method and circuit
  • Synchronous rectifying control method and circuit
  • Synchronous rectifying control method and circuit

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Embodiment Construction

[0061] 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 present invention, specific details are set forth in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details.

[0062] refer to figure 2 , shows a flow chart of a synchronous rectification control method applied to an isolated switching power supply according to an embodiment of the present invention. In this embodiment, the synchronous rectification control method includes the following steps:

[0063] S201: Receive the voltage between the firs...

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Abstract

Disclosed are synchronous rectifying control methods and circuits for an isolated switching power supply. In one embodiment, a method can include: (i) generating a ramp voltage based on a power terminal voltage, where the power terminal voltage includes a voltage between first and second power terminals of a synchronous rectifier in the isolated switching power supply; (ii) determining whether the power terminal voltage starts declining; (iii) comparing the ramp voltage to a threshold voltage when the power terminal voltage starts to decline, where the threshold voltage substantially matches a minimum conduction time of the synchronous rectifier; (iv) reducing the ramp voltage and controlling the synchronous rectifier in an off state when the ramp voltage is lower than the threshold voltage; and (v) reducing the ramp voltage and controlling the synchronous rectifier in on state when the ramp voltage is higher than the threshold voltage.

Description

technical field [0001] The invention relates to the technical field of semiconductors, in particular to a synchronous rectification control method and a synchronous rectification control circuit of a synchronous rectifier in a switching power supply using a power transformer. Background technique [0002] A conventional isolated power supply includes one or more primary side switches, at least one transformer and one or more rectifiers on the secondary side. The transformer is used to provide a relatively large voltage conversion ratio, implement more reliable short-circuit protection for the input source, and realize the isolation between the primary side and the secondary side that meets the requirements of safety regulations. The rectifier is used to rectify the AC voltage or current of the secondary winding of the transformer to generate the DC voltage or current required by the output load. Common transformer-based switching power supply topologies include flyback, for...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335H02M7/217
CPCH02M3/33523Y02B70/1475H02M3/33592Y02B70/10
Inventor 姚杰赵晨
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD
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