Switching power supply control circuit and system and switching power supply control method

A technology for controlling circuits and switching power supplies, applied in control/regulation systems, high-efficiency power electronic conversion, electrical components, etc., can solve problems such as overcurrent, increase in switching tube current value, audio noise, etc. Switching loss, the effect of ensuring safe operation

Active Publication Date: 2021-08-10
SHANGHAI BRIGHT POWER SEMICONDUCTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the load is reduced, the switching frequency may be reduced to fall into the audio frequency range (such as 200Hz-20kHz), causing audible noise
On the other hand, when the input voltage increases, the fixed on-time will cause the current value flowing through the switch tube to increase, and there is a risk of overcurrent

Method used

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  • Switching power supply control circuit and system and switching power supply control method
  • Switching power supply control circuit and system and switching power supply control method
  • Switching power supply control circuit and system and switching power supply control method

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Embodiment Construction

[0032] An overvoltage protection circuit and method, as well as a switching power supply proposed by the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will be more apparent from the following description. It should be noted that all the drawings are in a very simplified form and use imprecise scales, and are only used to facilitate and clearly assist the purpose of illustrating the embodiments of the present invention. In addition, it should be noted that the "time", "conduction time length" and "conduction time" referred to in this manual are all time periods, that is, the length of a period of time; "moment", "when...", " "Turn-off moment" is a time point, that is, the moment when an event occurs; "a signal indicating..." indicates a non-zero level to instruct a certain component or a certain module to perform corresponding actions; "... ...

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PUM

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Abstract

The invention provides a switching power supply control circuit, which is used for driving a first switch in a switching power supply to convert an input voltage into an output voltage, and comprises a turn-on time control unit, the turn-on time control unit receives a first signal and a second signal, the first signal represents the switching frequency of the first switch, and the second signal represents the current flowing through the first switch so as to generate a signal indicating the turn-off moment of the first switch; when the peak value of the current flowing through the first switch is lower than a preset current value, the turn-on time control unit determines the turn-off moment of the first switch according to the first signal so as to maintain the switching frequency of the first switch to be basically constant at a target frequency value. Therefore, generation of audio noise is effectively avoided, the output voltage can be stabilized and the high efficiency can be maintained when the load changes, and the safe operation of the switching power supply is ensured.

Description

technical field [0001] The invention mainly relates to the field of electronic circuits, in particular to a control circuit, a control method and a control system for a switching power supply. Background technique [0002] In the field of switching power supplies, the commonly used control methods are mainly voltage control mode, current control mode and constant on time control mode (COT for short), among which COT control has superior load transient response and simple control circuit configuration and is widely used. In the traditional COT control method, the switch tube is turned on when the output voltage of the switching power supply is lower than the reference signal, and the switch tube is turned off when the conduction time reaches a preset value. For the traditional COT control switching power supply, its switching frequency will gradually decrease as the load decreases. When the load is reduced, the switching frequency may be reduced to fall into the audio frequ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/44H02M3/335H02M1/32H02M7/217H02M1/08
CPCH02M1/44H02M3/33523H02M3/33553H02M1/32H02M7/217H02M1/08H02M1/007H02M7/06H02M1/0032H02M1/0054Y02B70/10H02M3/158H02M3/33507
Inventor 郭艳梅陈一辉缪海峰李岳辉郜小茹朱臻
Owner SHANGHAI BRIGHT POWER SEMICONDUCTOR CO LTD
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