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Synchronous rectification circuit and control circuit and method thereof

A control method and synchronous rectification technology, applied in the direction of control/regulation systems, high-efficiency power electronic conversion, electrical components, etc., can solve the problems of shutdown threshold design, adverse effects of the system, and poor versatility, so as to improve efficiency and apply Wide range of performance and high reliability

Active Publication Date: 2020-05-19
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method only designs a fixed higher turn-off threshold, which is not very versatile. If the turn-off threshold is too high, it may cause negative current shutdown and cause adverse effects on the system.

Method used

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  • Synchronous rectification circuit and control circuit and method thereof
  • Synchronous rectification circuit and control circuit and method thereof
  • Synchronous rectification circuit and control circuit and method thereof

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Embodiment Construction

[0063] The present invention is described below based on examples, but the present invention is not limited to these examples. In the following detailed description of the invention, some specific details are set forth in detail. The present invention can be fully understood by those skilled in the art without the description of these detailed parts. In order not to obscure the essence of the present invention, well-known methods, procedures, procedures, components and circuits have not been described in detail.

[0064] Additionally, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.

[0065] Meanwhile, it should be understood that in the following description, "circuit" refers to a conductive loop formed by at least one element or sub-circuit through electrical connection or electromagnetic connection. When an element or circuit is said to be "connected to" another eleme...

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PUM

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Abstract

The invention discloses a synchronous rectification circuit and a control circuit and a control method thereof. The driving voltage and the turn-off shielding time of a synchronous rectifier tube aredynamically adjusted, so that the synchronous rectifier tube is turned off at a proper turn-off point, the turn-off speed is high, negative current turn-off is avoided, and the efficiency of synchronous rectification is improved. In addition, the scheme is wider in applicability and higher in reliability.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a synchronous rectification circuit, a control circuit and a control method thereof. Background technique [0002] In order to improve the efficiency of the converter, a synchronous rectifier is usually used instead of a diode to form a synchronous rectification circuit. Due to the existence of lead inductance of the synchronous rectifier, the synchronous rectifier will be turned off in advance, thereby reducing the efficiency of the synchronous rectifier. In the prior art, a higher turn-off threshold is often used to control the synchronous rectifier to turn off when the drain-source voltage of the synchronous rectifier exceeds the turn-off threshold. However, this method only designs a fixed higher turn-off threshold, which is not universal, and if the turn-off threshold is too high, it may cause negative current to turn off and cause adverse effects on the system. ...

Claims

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Application Information

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IPC IPC(8): H02M3/335H02M1/08
CPCH02M3/33592H02M1/08Y02B70/10H02M3/01
Inventor 陈超军邓建金津
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD