Zero-voltage conduction flyback circuit and control method and control circuit thereof

A zero-voltage conduction and flyback circuit technology, which is applied in control/regulation systems, high-efficiency power electronic conversion, electrical components, etc., to optimize system efficiency, prevent primary and secondary sides from sharing, and reduce conduction loss.

Pending Publication Date: 2020-12-08
JOULWATT TECH INC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the object of the present invention is to provide a zero-voltage turn-on flyback circuit and its control method and control circuit to solve the problem of additionally increasing the switching loss and driving loss of the tube in the prior art

Method used

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  • Zero-voltage conduction flyback circuit and control method and control circuit thereof
  • Zero-voltage conduction flyback circuit and control method and control circuit thereof
  • Zero-voltage conduction flyback circuit and control method and control circuit thereof

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Embodiment Construction

[0034] 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.

[0035] 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.

[0036] 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 a simplified form and use imprecise scales, which are only used to facilitate and clearly assist the purpose of illustrating the embodiments of ...

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PUM

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Abstract

The invention discloses a zero-voltage conduction flyback circuit, a control method and a control circuit thereof, and the control method for the zero-voltage conduction flyback circuit is characterized in that: the zero-voltage conduction flyback circuit comprises a main switch tube, a second switch tube, a primary winding, a secondary winding and an auxiliary winding of a transformer; the secondswitch tube is connected with the auxiliary winding or the secondary winding; and in a critical conduction mode, the second switch tube is switched on after the main switch tube is switched off, andthe drain voltage of the main switch tube can be oscillated to be close to zero voltage by adjusting the switching-off moment of the second switch tube.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a zero-voltage conduction flyback circuit, a control method and a control circuit thereof. Background technique [0002] In traditional flyback converters, the main switching tube on the primary side is hard-turned-on, and the turn-on loss is large. As the adapter has higher and higher requirements for small size and high power density, the switching frequency needs to be increased, but the turn-on loss will be further increased, so the traditional hard-switching flyback converter is limited in this application. [0003] In response to the above problems, the industry has introduced a zero voltage conduction ZVS (zero voltage switching) flyback converter. tube) or the secondary side synchronous rectifier tube to generate a certain amount of negative excitation current, and then turn off the auxiliary tube or synchronous rectifier tube, the negative excitation current w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/08H02M1/38H02M3/335H02M1/32
CPCH02M1/083H02M1/32H02M1/38H02M3/33569H02M1/0054Y02B70/10
Inventor 黄必亮许祥勇
Owner JOULWATT TECH INC LTD
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