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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: 2016-01-20
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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  • Overvoltage protection circuit and device
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Embodiment Construction

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

[0019] Reference figure 1 In 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 jointly constitute an overvoltage protection device.

[0020] Reference 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 providing circuit 210 is used for providing a reference voltage, and the first voltage input terminal is electrically connected to t...

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Abstract

The invention provides an overvoltage protection circuit. The overvoltage protection circuit is electrically connected between an input circuit and a switching power supply circuit, and comprises a first voltage input end, a second voltage input end, a voltage output end, an input voltage detection circuit, a reference voltage providing circuit and a switching tube. The first voltage input end is electrically connected with the reference voltage providing circuit, and is used for receiving a reference voltage. The second voltage input end is electrically connected with the input voltage detection circuit, and is used for receiving a voltage to be compared. The voltage output end is connected with an input undervoltage cut-off pin of a power supply control chip of the switching power supply circuit. When the input voltage to be compared is overvoltage, the voltage output end of the overvoltage protection circuit outputs a voltage control signal so as to make the switching power supply circuit stop operating. The invention further provides an overvoltage protection device. The technical problem that the switching power supply circuit might be damaged since the existing switching power supply circuit has no overvoltage protection is effectively solved.

Description

Technical field [0001] The present invention relates to the technical field of circuit protection, and in particular to an overvoltage protection circuit and device. Background technique [0002] When converting AC power to DC power to supply power to 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 power control chip to realize a flyback constant voltage DC output switching power supply circuit, there is no input overvoltage protection function, and when the input voltage is too high, the switching power supply may be damaged. How to provide a protection circuit that can control the switching power supply to automatically turn off when the input voltage is too high is an urgent technical probl...

Claims

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Application Information

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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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