A controller overcurrent value adjustable protection circuit

By designing a circuit in the vehicle controller that includes overcurrent detection and protection switches, the current is monitored in real time and the resistance value is adjusted. This solves the problem of the overcurrent value of the self-resetting fuse being affected by temperature, and achieves overcurrent threshold accuracy and safety across the entire temperature range.

CN224473045UActive Publication Date: 2026-07-07ZHEJIANG ASIA PACIFIC MECHANICAL & ELECTRONICS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
ZHEJIANG ASIA PACIFIC MECHANICAL & ELECTRONICS CO LTD
Filing Date
2025-05-12
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

The overcurrent value of the self-resetting fuse in the existing vehicle controller is greatly affected by temperature, and the accuracy of the overcurrent threshold cannot be guaranteed across the entire temperature range. Furthermore, there are problems such as physical interference when adjusting the overcurrent threshold value.

Method used

The protection circuit adopts an overcurrent detection section and an overcurrent protection switch section. It uses a combination of resistors, current detectors, MOSFETs and transistors to monitor the current in real time and disconnect the power supply when there is an overcurrent. The overcurrent threshold value can be adjusted by adjusting the resistor value.

Benefits of technology

Achieving accuracy and flexibility in overcurrent threshold values ​​across the entire temperature range improves the safety and scalability of the vehicle controller.

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Abstract

The utility model discloses a kind of protection circuit of controller overcurrent value adjustable.Power supply is in turn powered for load RL by resistance R4, MOS tube Q1, the both ends of resistance R4 are connected with the two input terminals of current detector U1, the output terminal of current detector U1 is connected with triode Q36 through diode D1, triode Q36 is connected with triode Q37, triode Q36 one end ground, the output terminal of current detector U1 is grounded through resistance R3;Power supply is connected with MOS tube Q1 through resistance R1, power supply is connected with triode Q37 through resistance R2, triode Q37 is connected with MOS tube Q1, one end of triode Q37 ground.The utility model passes through real-time monitoring current in loop and adjusts overcurrent threshold by adjusting resistance value, when loop current exceeds overcurrent threshold and disconnects power supply, overcurrent fault is cancelled, and it is automatically normal power supply, and this circuit design improves the security level on the use of vehicle-mounted controller.
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