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Voltage protection circuit

A voltage protection and circuit technology, applied in the field of voltage protection circuits, can solve the problems of poor anti-interference ability and easy interference of voltage protection circuits, and achieve the effect of strong anti-interference ability

Active Publication Date: 2017-08-18
JILIN ZHONG YING HIGH TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Many voltage protection circuits have appeared in the prior art, but these voltage protection circuits have the disadvantages of being susceptible to interference and poor anti-interference ability

Method used

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Embodiment Construction

[0032] The core of the present invention is to provide a voltage protection circuit, which realizes the one-way transmission of electrical signals, realizes the electrical isolation between the input end of the voltage follower and the output end of the photocoupler, and the output signal has no influence on the input end. Strong anti-interference ability.

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the pres...

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Abstract

The invention discloses a voltage protection circuit. The voltage protection circuit comprises a rectification circuit, a voltage signal acquisition circuit, a voltage follower, an optical coupler and a control module, wherein the rectification circuit is connected with an AC power supply, an input end of the voltage signal acquisition circuit is connected with the rectification circuit, an input end of the voltage follower is connected with the voltage signal acquisition circuit, a positive electrode of a light emitting diode in the optical coupler is connected with an output end of the voltage follower, a negative electrode of the light emitting diode is connected with an output negative electrode line of the rectification circuit, a collector of a photosensitive semiconductor in the optical coupler is connected with a power supply through a resistor, an emitter of the photosensitive semiconductor is connected with the ground, an input end of the control module is connected with the collector of the photosensitive semiconductor, an output end of the control module is connected with a control end of a controllable switch, the control module is used for controlling the controllable switch to be switched off when a DC voltage output from the rectification circuit is not within a preset range, and the controllable switch is arranged on an output positive electrode line between the AC power supply and a load, With the voltage protection circuit disclosed by the invention, electrical isolation between an input end of the voltage follower and an output end of a photoelectrical coupler is achieved, no influence of an output signal on the input end is generated, and the voltage protection circuit is high in anti-interference capability.

Description

technical field [0001] The invention relates to the technical field of voltage protection, in particular to a voltage protection circuit. Background technique [0002] Voltage protection circuits play a very important role in power systems. The voltage protection circuit includes an overvoltage protection circuit and an undervoltage protection circuit, both of which work on the principle that when the voltage input from the power supply to the load exceeds a preset threshold, the voltage protection circuit operates to protect the power supply and the load. Many voltage protection circuits have appeared in the prior art, but these voltage protection circuits all have the disadvantages of being susceptible to interference and having poor anti-interference ability. [0003] Therefore, how to provide a solution to the above technical problems is a problem that those skilled in the art need to solve at present. Contents of the invention [0004] The purpose of the present inv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/20H02H3/24H02H1/00
CPCH02H1/0061H02H3/207
Inventor 不公告发明人
Owner JILIN ZHONG YING HIGH TECH CO LTD
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