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Switch tube driving control method and control circuit for switching power supply

A technology for driving control circuits and switching power supplies, used in electronic switches, high-efficiency power electronic conversion, electrical components, etc., can solve the problems of large switching losses and EMI interference, and achieve high efficiency, reduce switching losses, and improve EMI characteristics. Effect

Active Publication Date: 2018-11-27
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of this, the purpose of the present invention is to provide a switching tube drive control method and control circuit for switching power supplies, in order to solve the technical problems of large EMI interference and large switching losses in the prior art

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  • Switch tube driving control method and control circuit for switching power supply
  • Switch tube driving control method and control circuit for switching power supply
  • Switch tube driving control method and control circuit for switching power supply

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Embodiment Construction

[0031] 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.

[0032] 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, without which the description of these details can be fully understood by those skilled in the art.

[0033] 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 the present inv...

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Abstract

The invention discloses a switching tube driving control method and a control circuit for a switching power supply, which adopts a control method combining grid voltage detection and drain voltage detection of the switching tube, and is based on the connection between the high-voltage starting tube and the power switching tube relationship, convert the voltage of the high-voltage startup transistor into a smaller voltage for detection, detect the gate voltage of the power switch tube through the gate voltage detection circuit, and detect the drain voltage of the power switch tube through the drain voltage detection circuit, and according to the gate voltage The detection signal and the drain detection signal control the magnitude of the driving current. By adopting the control strategy of the present invention, it is possible to realize segmental drive optimization control of the power switching tube without detecting the Miller plateau voltage of the switching tube, thereby reducing the EMI interference of the power supply, improving the EMI characteristics of the power supply, and reducing the switching voltage of the switching tube. The switching loss of the tube improves the efficiency of the power supply.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a switching tube drive control method and a control circuit for switching power supplies. Background technique [0002] In a switching power supply, the gate drive method of the main power switching tube has a great influence on the performance of the power supply. If the driving ability is too strong (that is, the driving current is too large), the di / dt and dv / dt of the main power switch tube will be too large, which will cause serious EMI interference; if the driving ability is too weak (that is, the driving current is too small ), which will cause the switching delay of the main power switching tube to become larger and the switching speed to slow down, thereby increasing the switching loss. [0003] In order to reduce both EMI interference and switching loss, it is necessary to optimize the design of the gate drive circuit of the switch tube. The practice in the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/08H02M1/44
CPCH03K17/166H02M1/36H02M1/44Y02B70/10H02M1/0054H02M1/08H02M3/158
Inventor 张少斌李乐胡志亮白永江
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD
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