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Optocoupler overvoltage protection circuit and related appliances

An overvoltage protection circuit and optocoupler technology are applied in emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, and protection against overvoltage, etc., which can solve the safety and hidden dangers of buried circuits , breakdown damage and other problems to achieve the effect of enhancing safety protection and reliability and avoiding damage

Inactive Publication Date: 2019-04-02
APPOTRONICS CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the switching power supply has an overvoltage or short circuit fault, a large voltage or a large current will directly act on the optocoupler, causing the potential difference to exceed the voltage that the optocoupler can withstand, which will cause it to be broken down and damaged, burying a hole in the circuit. safety hazard

Method used

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  • Optocoupler overvoltage protection circuit and related appliances

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Embodiment Construction

[0017] It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. "Left" and "right" in the text are only for convenience of description in conjunction with the drawings, and do not constitute a limitation on the implementation.

[0018] Such as figure 1 As shown, in this embodiment, an optocoupler overvoltage protection circuit includes: fuse F2, power chip U6, transient diode D11, optocoupler U5 and voltage divider circuit, the fuse F2, power chip U6 and optocoupler The output terminals of U5 are connected sequentially, and the input terminals of the optocoupler U5 are connected with the voltage dividing circuit. Wherein, the cathode of the transient diode D11 is connected together with one end of the power supply chip U6 and the pin 3 of the output end of the optocoupler U5, and the anode of the transient diode D11 is grounded together with the pin 4 of the output end of the optoc...

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PUM

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Abstract

The invention relates to the technical field of circuit safety protection, and discloses an optocoupler overvoltage protection circuit. The circuit comprises a fuse, a power chip, a transient diode and an optocoupler, the fuse, the power chip and the optocoupler are sequentially connected, the cathode of the transient diode, one end of the power chip and a pin 3 of the output end of the optocoupler are connected, the anode of the transient diode and the pin 4 of the output end of the optocoupler are grounded, the transient diode is used for protection of the optocoupler when the transient large voltage is generated, and the fuse is employed to perform circuit protection at the large current generated by the transient diode to enhance the safety protection and reliability of the circuit. The present invention further provides an appliance of an optocoupler overvoltage protection circuit, and the appliance has a higher safety performance.

Description

technical field [0001] The invention relates to the technical field of circuit safety protection, in particular to an optocoupler overvoltage protection circuit. Background technique [0002] At present, the optocoupler is often used as the feedback device in the overvoltage protection between the primary and secondary stages of the switching power supply, and the output voltage is adjusted through the conduction of the optocoupler to achieve the purpose of constant output, so the optocoupler is the most critical device in the voltage feedback circuit , its stability and security directly affect the entire switching power supply. When the switching power supply has an overvoltage or short circuit fault, a large voltage or a large current will directly act on the optocoupler, causing the potential difference to exceed the voltage that the optocoupler can withstand, which will cause it to be broken down and damaged, burying a hole in the circuit. a security risk. Contents o...

Claims

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Application Information

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IPC IPC(8): H02H9/04H02H3/087
CPCH02H3/087H02H9/045H02H3/20H02H9/04
Inventor 李屹
Owner APPOTRONICS CORP LTD
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