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Method for controlling cross voltage of power switch of switching-type power converter, and circuit thereof

A technology for power converters and power switches, which is applied in control/regulation systems, output power conversion devices, DC power input conversion to DC power output, etc., and can solve problems such as damage and high cross-voltage

Active Publication Date: 2012-12-19
LEADTREND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the voltage across the power switch SW1 is almost proportional to the current I P , excessive current I P It will cause the voltage across the power switch SW1 to be too high and there is a risk of damage

Method used

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  • Method for controlling cross voltage of power switch of switching-type power converter, and circuit thereof
  • Method for controlling cross voltage of power switch of switching-type power converter, and circuit thereof
  • Method for controlling cross voltage of power switch of switching-type power converter, and circuit thereof

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Embodiment Construction

[0035] The direction of the present invention discussed here is a method and circuit for controlling the voltage across a power switch of a switching power converter. In order to have a thorough understanding of the present invention, detailed steps and components will be presented in the following description. It is evident that the practice of the invention is not limited to specific details familiar to those skilled in the art of the invention. On the other hand, well-known components or steps have not been described in detail so as not to unnecessarily limit the invention. The preferred embodiments of the present invention will be described in detail as follows, but in addition to these detailed descriptions, the present invention can also be widely implemented in other embodiments, and the scope of the present invention is not limited, and it is subject to the scope of the following patents .

[0036] The method for controlling the cross-voltage of the power switch of t...

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PUM

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Abstract

The invention relates to a method for controlling the cross voltage of a power switch of a switching-type power converter, and a circuit thereof. The method comprises the following steps: when the switching-type power converter is started, the switching frequency of the power switch of the switching type power converter is controlled as the first frequency; and after a definite period of time, the switching frequency of the power switch is changed to be the second frequency, wherein the first frequency is lower than the second frequency.

Description

technical field [0001] The present invention relates to a switched-mode power converter, in particular to a method and circuit for controlling the voltage across a power switch of the switched-mode power converter. Background technique [0002] A switching power converter, also known as a switched-mode power supply (SMPS), is an electronic power converter. The switch mode power converter is used for converting an input power and providing it to a load. Generally speaking, the input voltage and output voltage level of the switching mode power converter are not the same. Compared with linear power converters, switching power converters can provide higher power conversion efficiency and smaller circuit size. In a switching mode power converter with a transformer-coupled architecture, a transformer is used to isolate power from the input terminal to the output terminal. Among them, the side of the transformer close to the input voltage is called the primary side, and the othe...

Claims

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Application Information

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IPC IPC(8): H02M3/335
Inventor 张源文陈仁义沈逸伦
Owner LEADTREND TECH
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