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Over-current protection circuit and equipment with over-current protection function

An overcurrent protection circuit and resistor technology, applied in the circuit field, achieves the effects of low cost, avoiding circuit damage, and simple and fast triggering method

Pending Publication Date: 2021-03-19
CHENGDU T-RAY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are many problems in using fuses to protect circuits.

Method used

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  • Over-current protection circuit and equipment with over-current protection function
  • Over-current protection circuit and equipment with over-current protection function
  • Over-current protection circuit and equipment with over-current protection function

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Embodiment Construction

[0037] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of this application, not all of them. The components of the embodiments of the application generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

[0038] Accordingly, the following detailed description of the embodiments of the application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the application. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art w...

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PUM

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Abstract

The invention provides an over-current protection circuit and equipment with an over-current protection function. The over-current protection circuit comprises a sampling unit, a comparison unit, a switch assembly and a load. The sampling unit is used for collecting the current voltage and transmitting the current voltage to the comparison unit, and the current voltage is in positive correlation with the current in the load; if the current voltage is larger than the reference voltage, the current value in the load is too large, and overcurrent may occur. At the moment, the comparison unit outputs a high level to the third pole of the switch assembly, the switch assembly is disconnected, a circuit between the load and the power supply is cut off, and circuit damage caused by overcurrent isavoided. Compared with over-current protection through a fuse, the over-current protection circuit in the scheme can be repeatedly used, the cost is lower, the triggering mode is simple and rapid, time accumulation is not needed, the circuit is rapidly disconnected, and therefore the rapid protection effect is achieved.

Description

technical field [0001] The present application relates to the field of circuits, in particular, to an overcurrent protection circuit and a device with an overcurrent protection function. Background technique [0002] During the working process of the circuit, some components or wire harnesses are short-circuited, or the circuit is not working properly, which may lead to a large current situation. When a large current occurs, the chip will be burned at least, and the internal circuit of the PCB board will be burned at worst, making the entire board irreparable. Energy is needed to burn out devices and circuits. According to the formula Q=I^2Rt, as long as the output is turned off in a very short time during overcurrent, various burnouts caused by overcurrent can be avoided or reduced. [0003] In the prior art, a fuse or a resettable fuse is used to protect the circuit from overcurrent. However, there are many problems in using fuses to protect circuits. Therefore, develop...

Claims

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Application Information

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IPC IPC(8): H02H3/08H02H3/20
CPCH02H3/08H02H3/20
Inventor 魏征王榜伟朱先勇祝鹏罗烜郭凡玉
Owner CHENGDU T-RAY TECH CO LTD