A power supply protection circuit, power supply and vehicle

By introducing a switching power supply module, comparator, and constant current discharge circuit into the vehicle domain controller power system, the problems of increased size due to large-capacity electrolytic capacitors and slow overvoltage protection response are solved, achieving fast and accurate overvoltage protection and reducing system cost and size.

CN224555473UActive Publication Date: 2026-07-24Z-ONE TECH CO LTD
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Patent Information

Authority / Receiving Office
CN Ā· China
Patent Type
Utility models(China)
Current Assignee / Owner
Z-ONE TECH CO LTD
Filing Date
2025-07-29
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Traditional automotive domain controller power systems use large-capacity electrolytic capacitors, which increase system size and weight, and the overvoltage protection circuits have slow response speeds, making it difficult to cope with transient voltage fluctuations.

Method used

It employs a switching power supply module, a comparator, and a constant current discharge circuit. By comparing the output voltage with a preset threshold, a constant current source is used to perform constant current discharge when there is overvoltage. Combined with a hysteresis comparator, the response speed and protection accuracy are improved.

Benefits of technology

It reduces the need for filter capacitors, improves the safety and reliability of the power supply system, achieves rapid overvoltage protection, and enhances the stability and safety of the system.

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Abstract

The utility model discloses a kind of power protection circuit, battery and vehicle, its circuit includes: switching power supply module, for receiving input voltage and generating output voltage;Protection module is electrically connected with the switching power supply module, and includes: comparator, for comparing the output voltage with preset threshold voltage;Constant-current discharge circuit is electrically connected with the comparator, for constant-current discharge when the output voltage exceeds the preset threshold voltage;Wherein, the constant-current discharge circuit includes constant-current source, for providing predetermined discharge current when the output voltage exceeds the preset threshold voltage.The utility model can reduce filter capacitor capacity value, set accurate protection voltage, and provide constant-current discharge protection.
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