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Overcurrent protection circuit

An overcurrent protection circuit, overcurrent protection technology, applied in electrical components, electronic switches, pulse technology, etc., can solve problems such as damage to load equipment and excessive current

Pending Publication Date: 2016-12-07
SICHUAN YICHONG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide an overcurrent protection circuit to solve the problem that the current in the circuit of the load device is too large and the load device is easily damaged when an abnormal situation occurs

Method used

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Embodiment Construction

[0028] The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0029] Such as figure 1 As shown, the overcurrent protection circuit includes: a sampling control circuit 001 , a conversion circuit 002 , a comparison and judgment unit 003 and a latch drive unit 004 .

[0030] The sampling control circuit 001 collects the voltage at both ends of the load device through the first input terminal and the second input terminal, and outputs the collected voltage to the conversion circuit 002; the conversion circuit 002 converts the received voltage into a first voltage and sends it to the comparison The judgment unit 003; the comparison judgment unit 003 compares the first voltage with the reference voltage, and when the first voltage exceeds the reference voltage VREF, the comparison judgment unit 003 sends an overcurrent protection signal to the latch drive unit 004; the latch drive uni...

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Abstract

The invention discloses an overcurrent protection circuit comprising a sampling control circuit, a conversion circuit, a reference voltage circuit, a comparing and judging unit and a latch driving unit, wherein the sampling control circuit collects voltages on both ends of load equipments through a first input end and a second input end, and outputs the voltage collected by the first input end and the voltage collected by the second input end to the conversion circuit; the conversion circuit converts the received voltages into a first voltage and sends the first voltage to the comparing and judging unit; the comparing and judging unit compares the first voltage with a reference voltage, and sends an overcurrent protection signal to the latch driving unit when the first voltage exceeds the reference voltage; and the latch driving unit latches the overcurrent protection signal, reinforces the driving ability of the overcurrent protection signal, outputs the overcurrent protection signal to control the on-off of the load equipment so as to execute overcurrent protection measures on the load equipment.

Description

technical field [0001] The invention relates to the field of emergency protection circuits, in particular to an overcurrent protection circuit. Background technique [0002] At present, electronic switches are used in more and more electronic systems, and as the current flowing through the electronic switch increases, the resistance of the electronic switch becomes smaller and smaller; when an abnormal situation occurs, it will cause the current flowing through the electronic switch If the current is too large, it is easy to cause damage to the electronic switch; the traditional overcurrent protection circuit directly connects a resistor in series with the current path, and realizes protection by detecting the voltage difference on the resistor, but as the application current increases, the electronic The switch resistance is getting smaller and smaller, and the method of serial resistance detection can no longer meet the requirements, and the traditional over-current protec...

Claims

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Application Information

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IPC IPC(8): H03K17/082
CPCH03K17/082Y02B20/30
Inventor 梅当民杨靖刘柳
Owner SICHUAN YICHONG TECH CO LTD
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