High-side power supply control circuit

CN122456447APending Publication Date: 2026-07-24CHONGQING UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHONGQING UNIV OF TECH
Filing Date
2026-04-28
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

In existing high-side power supply systems, overcurrent protection response delays are long, and the priorities of hardware protection paths and MCU control paths are unclear, leading to system safety and reliability issues. Furthermore, power output control is difficult to manage after power-on.

Method used

A high-side power supply control circuit is designed, which includes a current sampling and detection unit, a fault judgment unit, a fault latching unit, an arbitration drive unit, and a main power switching unit. The hardware circuit realizes fast overcurrent protection, latches fault states, and establishes hardware signal priorities in the arbitration drive unit to coordinate the default power-on and fault state retention.

Benefits of technology

It achieves rapid overcurrent protection, avoids repeated conduction and surge impact of power devices, ensures the real-time performance and reliability of the system, and retains the management capabilities of the MCU, solving the safety problem of power output after power-on.

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Abstract

The application discloses a high-side power supply control circuit and belongs to the technical field of integrated circuits. In order to solve the problems of slow software protection response, easy automatic restart of hardware protection and control conflict of software and hardware in the existing high-side power supply control, the application provides a circuit comprising a current sampling detection unit, a fault judging unit, a fault latching unit, an arbitration driving unit and a main power switch unit. The fault judging unit compares a load current with a threshold to generate a hardware opening request signal; the fault latching unit latches a fault state signal when overcurrent occurs; the arbitration driving unit logically combines the hardware opening request signal, the fault state signal and a software opening request signal, and generates an enable signal only when there is no fault, the fault is not latched and the software allows; and the main power switch unit controls power supply accordingly. The application is used in a high-side power supply system and has the advantages of hardware fast shutdown, fault latching anti-restart, higher fault priority than software and power-on default opening and the like.
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