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Control circuit and control method of flyback converter

A flyback converter and control circuit technology, applied in control/regulation systems, DC power input conversion to DC power output, instruments, etc., can solve problems such as low efficiency, improve system efficiency, and reduce conduction loss Effect

Active Publication Date: 2021-04-23
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 control circuit and control method of a flyback converter to solve the problem of low efficiency caused by the intermittent interval during zero-voltage turn-on in the prior art

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  • Control circuit and control method of flyback converter
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  • Control circuit and control method of flyback converter

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Embodiment Construction

[0043] 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.

[0044] 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.

[0045] 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 control circuit and a control method of a flyback converter. The conduction moment of an auxiliary switch tube can be controlled according to the comparison result by comparing the volt-second integral of the voltage of a transformer winding in the conduction period of a main switch tube and the volt-second integral in the turn-off period of the main switch tube, so that the auxiliary switch tube can be turned on in time, the interruption time of the inductive current in the critical conduction mode is very short or uninterrupted, the conduction loss of the main switch tube and the transformer is reduced, and the system efficiency is improved.

Description

technical field [0001] The present invention relates to the technical field of power electronics, and more specifically, relates to a control circuit and a control method of a flyback converter. 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 view of the above problems, in order to realize zero-voltage (ZVS) turn-on, the industry has proposed that before the main switch on the primary side is turned on, the auxiliary switch is turned on after a delay of a period of time according to the detection result by detecting whether the drain-source voltage of the main power tube is close to zero. T...

Claims

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Application Information

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