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Synchronous rectification control circuit, control method and switching power supply

A control circuit and control switch technology, applied in control/regulation systems, high-efficiency power electronic conversion, electrical components, etc., can solve the problems of large loss and low efficiency of synchronous rectification switching tubes, and achieve reduced switching power supply loss and system efficiency. improved effect

Pending Publication Date: 2020-10-16
JOULWATT TECH INC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the object of the present invention is to provide a synchronous rectification control circuit, a control method and a switching power supply to solve the technical problems of large loss and low efficiency of synchronous rectification switch tubes in the prior art

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  • Synchronous rectification control circuit, control method and switching power supply
  • Synchronous rectification control circuit, control method and switching power supply
  • Synchronous rectification control circuit, control method and switching power supply

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Embodiment Construction

[0036] 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 within the spirit and scope of the present invention.

[0037] 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.

[0038] In the following paragraphs the invention is described more specifically by way of example with reference to the accompanying drawings. It should be noted that all the drawings are in simplified form and use inaccurate scales, which are only used to facilitate and clearly assist the purpose of illustrating the embodiments of t...

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Abstract

The invention discloses a synchronous rectification control circuit, a control method and a switching power supply. The method comprises the steps: controlling a gate-source voltage value through a signal conditioning circuit before a synchronous rectifier tube is turned off; enabling a pull-down signal provided by the signal conditioning circuit to begin to decrease when the gate-source voltage drops to a certain preset value, so that the gate-source voltage of the synchronous rectifier tube does not quickly reach a turn-off voltage value, and the drain-source voltage of the synchronous rectifier tube is controlled to be maintained near the first threshold voltage, so the beneficial effects of reducing the loss of the switching power supply and improving the system efficiency can be achieved.

Description

technical field [0001] The invention relates to the field of switching power supplies, more specifically, to a synchronous rectification control circuit, a control method and a switching power supply. Background technique [0002] In switching power supply circuits, in order to improve the conversion efficiency of switching power supplies, synchronous rectification switching tubes are usually used instead of rectifier diodes, such as figure 1 Shown is a schematic block diagram of a flyback switching power supply. The secondary side uses a rectifier switching tube M2 instead of a diode. The flyback switching power supply also includes an isolation transformer T, a main switching tube M1 on the primary side, an input capacitor C1 and an output capacitor C2. [0003] In the working process of the flyback switching power supply, in order to turn off the rectifier M2 as soon as possible to realize the continuous operation mode (CCM) of the switching power supply, the control meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
CPCH02M3/33592H02M1/0054Y02B70/10
Inventor 苏志勇
Owner JOULWATT TECH INC LTD
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