Charging device output short circuit detection circuit

By using a combination of a low-voltage fixed power supply and a microcontroller-controlled switching circuit in the charging device, the short-circuit state at the output of the charging gun can be accurately detected, solving the problems of long detection response time and low accuracy in the existing technology, and improving charging safety and reliability.

CN224536153UActive Publication Date: 2026-07-21ZHUHE (XIAMEN) NEW ENERGY TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
ZHUHE (XIAMEN) NEW ENERGY TECH CO LTD
Filing Date
2025-05-26
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Existing charging equipment suffers from long response time, low detection accuracy, and high false alarm rate when detecting short circuits at the output of the charging gun, leading to safety hazards.

Method used

A combination circuit consisting of a low-voltage fixed power supply, a microcontroller, pull-up resistors, first and second switching circuits, and protection diodes is used. The short circuit condition is determined by measuring the output impedance between the Lout and Nout terminals. The short circuit detection is performed by controlling the conduction and cutoff states of the switching transistors using the microcontroller.

Benefits of technology

It enables rapid and accurate detection of short circuits at the output terminal before charging, improving charging safety, avoiding dangers during high-voltage power-on, and enhancing the reliability and accuracy of detection.

✦ Generated by Eureka AI based on patent content.

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    Figure CN224536153U_ABST
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Abstract

The utility model discloses a kind of short-circuit detection circuits of charging equipment output end, including low voltage fixed power supply, single-chip microcontroller, pull-up resistance, first switching circuit and second switching circuit, equipment output end includes Lout end and Nout end, the voltage of low voltage fixed power supply is 1~36V;Low voltage fixed power supply is connected to upper voltage dividing resistance, and is divided into two-way connection to first switching circuit and second switching circuit;First switching circuit is connected to Lout end, and first switching circuit includes first switch;Second switching circuit includes lower voltage dividing resistance, second switch and switch tube, lower voltage dividing resistance is connected to switch tube and second switch respectively, switch tube is connected to single-chip microcontroller, one end of second switch is connected to Nout end, and the other end is connected to ground;Close first switch and second switch, when Lout end and Nout end short circuit, switch tube cut-off;When Lout end and Nout end have no short circuit, switch tube conduction.The utility model circuit can realize the short-circuit detection of output end, improve the security of charging, and detection precision is high.
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