Anti-backfeed protection circuit

A protection circuit and anti-backflow technology, which can be used in emergency protection circuit devices, electrical components, etc., and can solve problems such as high power consumption and difficult heat dissipation.

Active Publication Date: 2018-03-02
SICHUAN HUIYUAN OPTICAL COMM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the present invention provides an anti-backfeed protection circuit to improve the technical problems of large power consumption and difficult heat dissipation when diodes are used to achieve anti-backfeed in the prior art

Method used

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Embodiment Construction

[0017] The present invention will be described in further detail below through specific implementation examples and in conjunction with the accompanying drawings.

[0018] refer to figure 2 , the anti-backfeed protection circuit 200 provided by the present invention is electrically connected between an input circuit 100 and an output circuit 300 . The anti-backfeed protection circuit 200 includes: a reference voltage supply circuit 210 , a voltage comparison circuit 220 and an anti-backfeed control circuit 230 . The voltage comparison circuit 220 includes a current detection resistor. The output end of the reference voltage supply circuit 210 is connected to the first input end of the voltage comparison circuit 220 . The negative pole of the input circuit 100 is connected to the negative pole of the output circuit 300 via the current detection resistor, and a feedback voltage formed on the current detection resistor acts on the second input terminal of the voltage compariso...

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Abstract

The invention provides an anti-backflow protection circuit, which is electrically connected between an input circuit and an output circuit. The anti-backflow protection circuit includes: a reference voltage supply circuit, a voltage comparison circuit and an anti-backflow circuit. The voltage comparison circuit includes a current sense resistor. The output terminal of the reference voltage supply circuit is connected to the first input terminal of the voltage comparison circuit, the negative terminal of the input circuit is connected to the negative terminal of the output circuit through the current detection resistor, and the feedback voltage formed on the current detection resistor acts on the second input terminal of the voltage comparison circuit. The anti-backflow circuit includes a P-channel MOSFET. The voltage comparison circuit compares the reference voltage and the feedback voltage, and controls the working state of the P-channel MOSFET through the output end of the voltage comparison circuit to prevent the back-feed current from entering the input circuit from the output circuit. The technical problem of large power consumption and large heat dissipation when the diode is used to realize anti-backflow in the prior art is solved.

Description

technical field [0001] The invention relates to the technical field of circuit protection, in particular to an anti-backfeed protection circuit. Background technique [0002] The anti-backfeed protection circuit is often used to prevent the power supply from being damaged by the current backfeed at the output terminal. The anti-backfeed control circuit of the DC output in the prior art realizes the anti-backfeed through a diode. The circuit is as follows: figure 1 , the AC current source rectifies the AC to DC through the rectifier bridge BR1, the DC positive pole of the rectifier bridge BR1 is connected to the positive pole of C2, the negative pole of DC is connected to the negative pole of C2, and C2 is used for energy storage and filtering. The positive pole of the direct current is connected to the positive pole of the diode D1, and the negative pole of the diode D1 is connected to the positive pole of the direct current output. The DC output negative pole is directly c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H11/00
Inventor 李绍飞宋昌林陈方春
Owner SICHUAN HUIYUAN OPTICAL COMM CO LTD
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