Locking screw loosening detection circuit

By designing a loose locking screw detection circuit, voltage changes are collected and judged in real time. By using a state holding unit composed of an optocoupler and a transistor, the problem of unstable contact caused by loose locking screws in lithium battery systems is solved, realizing rapid early warning protection and improving the safety and reliability of the equipment.

CN224383339UActive Publication Date: 2026-06-19XIAMEN HUALIAN ELECTRONICS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
XIAMEN HUALIAN ELECTRONICS CO LTD
Filing Date
2025-05-20
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

In existing technologies, the loosening of locking screws in lithium battery systems cannot be detected in real time, resulting in weak contact, increased contact resistance, and the potential for equipment overheating and instability, or even the risk of burning out the circuitry.

Method used

Design a detection circuit for loose locking screws. Through a voltage acquisition unit and a signal detection unit, the voltage change of the locking screw is acquired and judged in real time. A state holding unit composed of an optocoupler and a transistor is used to realize rapid early warning protection.

Benefits of technology

It enables real-time rapid response and early warning for loose locking screws. The circuit is simple and low-cost, which can effectively avoid equipment instability and circuit damage, and improve the safety and reliability of the system.

✦ Generated by Eureka AI based on patent content.

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Abstract

This utility model discloses a detection circuit for loose locking screws, including a voltage acquisition unit and a signal detection unit. The input terminal of the voltage acquisition unit is connected between the locking screw and the load, and the voltage acquisition unit outputs a corresponding voltage signal based on the sampled voltage. The input terminal of the signal detection unit is connected to the output terminal of the voltage acquisition unit, and the signal detection unit outputs a corresponding detection signal based on the voltage signal. The looseness of the locking screw is detected based on the detection signal. Thus, by acquiring the voltage change at the locking point, the looseness of the locking screw can be determined. This can be achieved with only a pure hardware circuit, which is simple, low in cost, and can provide real-time and rapid early warning protection.
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