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Switching power supply over-temperature protection circuit and over-temperature protection method

An over-temperature protection circuit, switching power supply technology, applied in the direction of emergency protection circuit device, automatic disconnection emergency protection device, circuit device, etc., can solve the problem of adding a controller and so on

Active Publication Date: 2020-08-28
JOULWATT TECH INC LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a switching power supply over-temperature protection circuit and protection method for realizing the external over-temperature protection of the switching power supply controller, so as to solve the external over-temperature of the switching power supply controller in the prior art and the need to increase the controller’s extra lead. foot problem

Method used

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  • Switching power supply over-temperature protection circuit and over-temperature protection method
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  • Switching power supply over-temperature protection circuit and over-temperature protection method

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Embodiment Construction

[0015] The 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 arrangements made within the spirit and scope of the present invention.

[0016] In order to give the public a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments of the present invention, and those skilled in the art can fully understand the present invention without the description of these details.

[0017] The invention is described in more detail by way of example in the following paragraphs with reference to the accompanying drawings. It should be noted that, the accompanying drawings are all in a relatively simplified form and in an inaccurate scale, so as to facilitate and clearly assist in explaining the purpose ...

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Abstract

The invention provides a switching power supply over-temperature protection circuit and an over-temperature protection method. The over-temperature protection circuit multiplexes a driving pin of a switching power supply controller to realize over-temperature protection. And when the drain-source end voltage of the main power tube of the switching power supply is stable, the over-temperature protection circuit is enabled. The over-temperature protection circuit can reuse the driving pin of the switching power supply controller to realize over-temperature protection, and an extra chip pin doesnot need to be arranged.

Description

technical field [0001] The invention relates to the field of power electronics, in particular to an over-temperature protection circuit and an over-temperature protection method of a switching power supply. Background technique [0002] In the switching power supply, usually the PWM control chip has its own internal over-temperature protection. In addition to the internal over-temperature protection, the application also hopes that the controller can have its own external over-temperature protection. The external over-temperature protection detects the temperature of the power device near the temperature-sensitive resistor (NTC) to realize over-temperature protection. In order to realize the external over temperature protection, usually need to add a pin to the controller to realize. SUMMARY OF THE INVENTION [0003] The purpose of the present invention is to provide a switching power supply over-temperature protection circuit and a protection method for realizing the ext...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/32H02H7/12H02H5/04
CPCH02M1/32H02H7/1213H02H5/04H02H5/042H02M1/327Y02B70/10
Inventor 周逊伟其他发明人请求不公开姓名
Owner JOULWATT TECH INC LTD
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