MOS tube anti-reverse connection and anti-backflow circuit and electronic product

By combining a P-channel MOSFET, a PNP transistor, and a capacitor in a combined circuit structure, the problem of reverse current flow in the MOSFET reverse connection protection method is solved, achieving both reverse connection and reverse current protection effects, improving circuit reliability and reducing costs.

CN224097412UActive Publication Date: 2026-04-07SHENZHEN ZHIWEI INTELLIGENT SOFTWARE DEV CO LTD
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Patent Information

Application Number
CN202520699729.6
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-04-14
Publication Date
2026-04-07
Estimated Expiration
2035-04-14

AI Technical Summary

Technical Problem

Existing reverse connection protection methods for MOSFETs have the problem of backflow current, which affects the normal operation of the power supply.

Method used

It adopts a combined circuit structure including P-channel MOSFETs, PNP transistors and capacitors. By designing the position of the capacitors and the connection method of the transistors, it achieves the functions of preventing reverse connection and backflow.

Benefits of technology

It provides reverse connection protection while preventing current backflow, improving the reliability of the protection circuit and reducing the number of components and cost.

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Abstract

The utility model relates to an anti-reverse-connection and anti-backflow circuit for an MOS tube and an electronic product. The anti-reverse-connection and anti-backflow circuit comprises an MOS tube assembly and a capacitor, along the current direction, the capacitor is located at the downstream of the MOS tube assembly; the MOS tube assembly comprises a P-channel MOS tube, a first triode and a second triode; by applying the circuit provided by the invention, reverse connection prevention protection can be provided, current backflow is prevented, and the reliability of the protection circuit is improved; the whole circuit is simple in structure, the number of related elements is small, and cost is low.
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