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Short circuit protection circuit

A technology of short-circuit protection circuit and booster circuit, which is applied in the direction of emergency protection circuit device, short-circuit test, circuit device, etc., which can solve the problem of damage to peripheral devices and achieve the effect of preventing burnout

Active Publication Date: 2021-11-12
SHANGHAI XINLONG SEMICON TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Once the output is short-circuited, even if the chip and power tube are not working, the current will still flow through the inductor and diode, resulting in damage to peripheral devices

Method used

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  • Short circuit protection circuit
  • Short circuit protection circuit
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Embodiment Construction

[0025] The specific implementation manner of the present invention will be described in more detail below with reference to schematic diagrams. 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.

[0026] Hereinafter, the terms "first", "second", etc. are used to distinguish between similar elements, and are not necessarily used to describe a specific order or chronological order. It is to be understood that these terms so used are interchangeable under appropriate circumstances. Similarly, if a method described herein includes a series of steps, the order in which these steps are presented is not necessarily the only order in which these steps can be performed, and some described steps may be omitted and / or...

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PUM

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Abstract

The invention provides a short-circuit protection circuit, comprising: a switch module, which disconnects the input current when the BOOST boost circuit is short-circuited; an over-current judgment module, which judges whether the input current is overloaded, and outputs a judgment result; a short-circuit judgment module, which receives According to the judgment result of the overcurrent judging module, if the input current is overloaded, judge whether the cause of the input current overload is the short circuit of the BOOST booster circuit or the excessive starting current, and output the judgment result; restart the control module, and receive the short circuit judgment According to the judgment result of the module, if the BOOST booster circuit is short-circuited, it will output a short-circuit signal and the time to disconnect the input current, and finally feed back the short-circuit signal and the time to disconnect the input current to the switch module to control the switch module to turn off The time to turn on the input current and turn off the input current. The invention can detect whether the BOOST boost circuit is short-circuited, and cut off the input current to protect the circuit.

Description

technical field [0001] The invention relates to the field of DC-DC switching power supplies, in particular to a short circuit protection circuit. Background technique [0002] The BOOST topology circuit is also commonly referred to as a BOOST boost circuit, which can convert a lower input voltage into a higher output voltage. The circuit has a simple structure and is widely used. However, due to the topological structure of the circuit, in the case of an output short circuit, even if the main control chip is not working and the power tube is not conducting, the current at the input terminal can still flow through the inductor and the freewheeling diode to the output terminal. The current is uncontrollable during a short circuit, resulting in damage to the device. [0003] At present, the power chip used in the BOOST boost circuit usually only has current limiting protection, that is, when the output is overloaded, the current flowing through the power tube is limited to pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/087H02H7/12H02M3/158G01R31/52
CPCG01R31/52H02H3/087H02H7/1213H02M3/158
Inventor 许锦龙李瑞平
Owner SHANGHAI XINLONG SEMICON TECH CO LTD