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Synchronous rectification control method and synchronous rectification circuit

A technology of synchronous rectification and control method, which is applied in the direction of converting AC power input to DC power output, electrical components, and output power conversion devices, etc., which can solve the problems of error-prone output voltage detection and difficulty of accurate shutdown of synchronous rectification circuit current. , to achieve the accurate effect of primary edge detection

Active Publication Date: 2017-11-07
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] In view of this, the object of the present invention is to provide a synchronous rectification control method and a synchronous rectification circuit to solve the technical problems in the prior art that the output voltage detection is prone to errors and the current in the synchronous rectification circuit is difficult to turn off accurately

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  • Synchronous rectification control method and synchronous rectification circuit
  • Synchronous rectification control method and synchronous rectification circuit
  • Synchronous rectification control method and synchronous rectification circuit

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Embodiment Construction

[0027] The 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 solutions made within the spirit and scope of the present invention.

[0028] In order for the public to have a thorough understanding of the present invention, specific details are described in the following preferred embodiments of the present invention, and those skilled in the art can fully understand the present invention without the description of these details.

[0029] In the following paragraphs, the present invention is described in more detail by way of example with reference to the drawings. It should be noted that the drawings all adopt a relatively simplified form and all use imprecise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the emb...

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Abstract

The invention discloses a synchronous rectification control method and a synchronous rectification circuit, including a plurality of working stages. In the late working stage of synchronous rectification, as the current decreases, the drain-source voltage rises to the closed-loop threshold voltage, and the gate-source voltage Start to decrease, so that the on-resistance increases, and by making the drain voltage of the synchronous rectifier close to the reference voltage, the drain-source voltage is kept equal to the closed-loop threshold voltage; thus, the drain-source voltage can be kept constant in the later stage of synchronous rectification conduction , so that the detection of the primary side is more accurate; at the same time, the present invention uses the gate-source turn-off threshold voltage to judge the turn-off moment, so as to ensure that the synchronous rectifier tube is turned off precisely when the current crosses zero.

Description

Technical field [0001] The invention relates to the technical field of power electronics, in particular to a synchronous rectification control method and a synchronous rectification circuit. Background technique [0002] Synchronous rectification is a method of using power MOSFETs with low on-resistance to replace rectifier diodes to reduce rectification losses. figure 1 Listed in the prior art are synchronous rectifier circuits based on flyback topology, including a transformer composed of a primary side inductor L1 and a secondary side inductor L2, an output capacitor C1, and a synchronous rectifier tube M. D, S, and G represent synchronous rectifier tubes, respectively The drain, source and gate of M. Regulator is the main power switch of the flyback topology. figure 2 For and figure 1 The corresponding working waveform diagram, V_ds is the drain-source voltage of the synchronous rectifier M, and V_gs is the gate-source voltage of the synchronous rectifier M. [0003] Such as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/217
Inventor 李新磊徐孝如白永江张少斌
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD
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