Overvoltage detection circuit

An overvoltage detection and circuit technology, applied in the direction of measuring electrical variables, measuring devices, measuring current/voltage, etc., can solve the problems of large power consumption and noise, and achieve the effect of reducing power consumption and enhancing anti-noise performance

Active Publication Date: 2012-05-02
ANHUI DONGKE SEMICON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the above technical problems, an embodiment of the present application provides an overvoltage detection circuit to solve the problems of large noise and high power consumption in the existing overvoltage detection circuit. The technical solution is as follows:

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Embodiment Construction

[0028] In order to enable those skilled in the art to better understand the technical solutions in the present application, 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 The embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0029] See figure 1 , shows a schematic structural diagram of an overvoltage detection circuit, mainly including: a voltage sampling circuit 100, a setting circuit 200, a decision circuit 300, a first control switch S1, a second control switch S2, a third control switch S3, and a second control switch S3. A voltage-controlled current gen...

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Abstract

The application discloses an overvoltage detection circuit that comprises a voltage sampling circuit, a setting circuit, a decision circuit, a first control switch, a second control switch, a third control switch, a first voltage-controlled current generation unit and a second current generation unit. When the overvoltage detection circuit detects that an input voltage is higher than a preset voltage, an output low level signal controls the second control switch to be broken, so that the overvoltage detection circuit will not detect an input voltage signal; therefore, it is avoided that a noise signal is input into the overvoltage detection circuit and thus the anti-noise performance of the overvoltage detection circuit can be strengthened; meanwhile, power consumption of the overvoltage detection circuit can also be reduced.

Description

technical field [0001] The present application relates to the technical field of voltage detection, in particular to an overvoltage detection circuit. Background technique [0002] An overvoltage detection circuit is a circuit that generates an output signal when the input voltage exceeds a preset voltage. The traditional overvoltage detection circuit is composed of a comparator and a sampling resistor. The comparator is an analog circuit, and its noise tolerance is relatively weak. , if the comparator is fast enough to respond to the noise, and the noise is relatively large, the output terminal will generate relatively large noise, that is, the output signal at the output terminal will jump out of order between high and low levels. The power consumption of the voltage detection circuit will also increase significantly. Contents of the invention [0003] In order to solve the above technical problems, an embodiment of the present application provides an overvoltage detec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00
Inventor 龙爽陈岚陈巍巍杨诗洋雷镇海
Owner ANHUI DONGKE SEMICON CO LTD
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