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Overvoltage protection circuit and device

An overvoltage protection circuit, circuit technology, applied in emergency protection circuit devices, protections that respond to overvoltage, electrical components, etc., can solve problems such as damage to switching power supplies

Active Publication Date: 2017-12-12
SICHUAN HUIYUAN OPTICAL COMM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the present invention provides an overvoltage protection circuit to improve the technical problem that the switching power supply may be damaged when the input voltage is too high in the prior art

Method used

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Embodiment Construction

[0018] The present invention will be described in further detail below through specific implementation examples and in conjunction with the accompanying drawings.

[0019] refer to figure 1 , the overvoltage protection circuit 200 provided by the present invention, the overvoltage protection circuit 200 is electrically connected between the input circuit 100 and the switching power supply circuit 300 . The overvoltage protection circuit 200, the input circuit 100 and the switching power supply circuit 300 together constitute an overvoltage protection device.

[0020] refer to figure 1 , the overvoltage protection circuit 200 may include a first voltage input terminal, a second voltage input terminal, a voltage output terminal, an input voltage detection circuit 220 , a reference voltage supply circuit 210 and a switch tube 230 .

[0021] The reference voltage supply circuit 210 is used for providing a reference voltage, and the first voltage input terminal is electrically co...

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Abstract

The invention provides an overvoltage protection circuit and device. The overvoltage protection circuit is electrically connected between the input circuit and the switching power supply circuit. The overvoltage protection circuit includes a first voltage input terminal, a second voltage input terminal, a voltage output terminal, an input voltage detection circuit, a reference voltage supply circuit and a switch tube. The first voltage input end is electrically connected with the reference voltage supply circuit for receiving the reference voltage. The second voltage input end is electrically connected with the input voltage detection circuit for receiving the voltage to be compared. The voltage output terminal is connected to the input undervoltage shutdown pin of the power supply control chip of the switching power supply circuit through the switch tube. When the input voltage to be compared is overvoltage, the voltage output terminal of the overvoltage protection circuit outputs a voltage control signal to stop the switching power supply circuit from working. The invention also provides an overvoltage protection device. The technical problem that no overvoltage protection in the existing switching power supply circuit may damage the switching power supply circuit is effectively solved.

Description

technical field [0001] The invention relates to the technical field of circuit protection, in particular to an overvoltage protection circuit and device. Background technique [0002] When converting AC power to DC power supply for electrical equipment, it is generally necessary to provide a DC-to-DC constant-voltage switching power supply to provide a stable constant-voltage DC output to the electrical equipment. In the prior art, a power control chip is commonly used to implement a flyback constant voltage DC output switching power supply. [0003] However, in the circuit where the power control chip implements a flyback constant voltage DC output switching power supply, there is no input overvoltage protection function, and the switching power supply may be damaged when the input voltage is too high. How to provide a protection circuit that can control the switching power supply to automatically shut down when the input voltage is too high is an urgent technical problem ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/10H02H3/20
Inventor 李绍飞宋昌林陈方春
Owner SICHUAN HUIYUAN OPTICAL COMM CO LTD
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