提出了一种适用于快速响应电源管理系统中的软启动电路。该电路利用运算放大器钳位反馈原理，实现了平稳无过冲的软启动切换。基于0.25μm BCD（双极型晶体管、互补型金属氧化物场效应管及高功率双扩散半导体场效应管集成技术）工艺，对所设计电路进行了仿真验证。仿真结果表明，该电路在–40～+125℃的温度范围内都能够实现稳定的软启动切换。结合系统整体仿真结果分析，本电路的性能达到了使电源系统稳定启动的预期目标，可用于对响应速度要求较高的避雷器监测系统。%A kind of soft-start circuit without overshoot suitable for power management module of high-speed response system was proposed. The clamp feedback circuit was used to realize stable switch without overshoot during the whole soft start process. Based on 0.25μm BCD technique(a kind of silicon processes combines the bipolar device, CMOS and DMOS for power and high-voltage elements), the circuit was verified by simulation. The simulation results show that the circuit can realize stable soft-start switch in a given temperature fluctuation range (–40–+125℃).Combined with the analysis of the whole system simulation results, the performance of the circuit achieves the expected goal of stable soft-start, and the module can be implemented in lightning guard monitor system, which has a high demand of response speed.
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