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Input overvoltage protection circuit and DC-DC power supply conversion device

A technology of overvoltage protection circuit and output circuit, which is applied to emergency protection circuit devices, output power conversion devices, circuit devices, etc., can solve the problems of low reliability and high cost of overvoltage protection circuits, and achieve high reliability and low cost. The effect of low, simple circuit structure

Active Publication Date: 2011-04-27
EVOC SMART IOT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the embodiments of the present invention is to provide an input overvoltage protection circuit, which aims to solve the problems of high cost and low reliability of the existing overvoltage protection circuit

Method used

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  • Input overvoltage protection circuit and DC-DC power supply conversion device
  • Input overvoltage protection circuit and DC-DC power supply conversion device
  • Input overvoltage protection circuit and DC-DC power supply conversion device

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Embodiment Construction

[0033] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0034] The input overvoltage protection circuit provided by the embodiment of the present invention uses a voltage detection circuit to detect the input voltage. When the input voltage is higher than the set reference voltage, the load 6 is disconnected and isolated from the input voltage through the switch circuit, so as to protect the load from being damaged. be damaged; this circuit has simple structure, low cost and high reliability.

[0035] The input overvoltage protection circuit provided by the embodiment of the present invention is mainly applied to a DC-DC power conversion device t...

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Abstract

The invention is suitable for the field of overvoltage protection, and provides an input overvoltage protection circuit and a direct current-direct current (DC-DC) power supply conversion device. The input overvoltage protection circuit comprises a voltage detection circuit, a drive and delay circuit, an output circuit and a switching circuit which are connected in turn, wherein the voltage detection circuit detects input voltage, compares the detected voltage with set reference voltage and outputs a corresponding voltage signal according to a comparison result; the output circuit outputs a switching control signal according to a drive and delay signal output by the drive and delay circuit and controls the switching on and off of the switching circuit; the output end of the switching circuit is connected with a load; and when overvoltage is input, the switching circuit is switched off, and the load is isolated from the input voltage. In the input overvoltage protection circuit, the voltage detection circuit detects the input voltage, and the load is isolated from and disconnected with the input voltage through the switching circuit when the input voltage is higher than the set reference voltage, so that the load is prevented from being damaged.

Description

technical field [0001] The invention belongs to the field of overvoltage protection, and in particular relates to an input overvoltage protection circuit and a DC-DC power conversion device. Background technique [0002] The input overvoltage protection circuit is widely used in the low-voltage DC-DC power conversion circuit. This input overvoltage protection circuit is used to prevent the circuit from being damaged due to misconnection. When the input voltage is normal, the protection circuit can restore the system to a stable working state. [0003] In order to achieve the above functions, the overvoltage protection circuit should meet the following key technical requirements: [0004] (1) The overvoltage protection circuit itself can work normally under the condition of overvoltage, that is, the working voltage range of the overvoltage protection circuit is much larger than the working voltage range of the system; in the predictable voltage range, the overvoltage protect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/20H02H3/027H02H7/10H02M3/00
Inventor 杨明盛
Owner EVOC SMART IOT TECH CO LTD
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