航天服浪涌抑制电路设计和应用研究

为解决航天服电源带载切换瞬间浪涌抑制功能失效问题,提出一种改进的浪涌电流抑制方法,增加MOS管栅极电压快速泄放通道,设计相对独立的充电电路和放电电路,通过分析计算确定各阻容元件的参数值;仿真计算结果表明,MOS管栅极电压泄放时间由48.55ms减小为554.5μs,充满电时间由90ms变为42ms,放电时间加快,而充电时间相对稳定;经实验测试,电源初始加电及电源切换加电瞬间,浪涌电流峰值均不大于3A,两种工况下浪涌电流都能得以抑制;改进后的浪涌抑制电路有效地解决了带载切换过程中浪涌电流过大的问题,能够很好地应用于航天服的供电系统中。

The Design and Application Research of Surge Suppression Circuit for Spacesuit

In order to solve the problem that the surge suppression function failed at the moment of spacesuit power switching with load,an improved method for surge suppression was proposed.The fast discharge path of MOS gate voltage was added,the relatively isolated charging circuit and discharging circuit were designed,and the parameters of resistance and capacitance were determined through analysis and calculation.The simulation and calculation results showed that the discharge time of MOS gate voltage was reduced from 48.55 ms to 554.5μs,and the charge time was changed from 90 ms to 42 ms,the discharge time was accelerated while the charge time was stable.The test results showed that the peak current was no more than 3 Aat the moment of initial power on and power switching,which indicated that the surge current could be suppressed under both conditions.The improved surge suppression circuit could effectively solve the problem of excessive surge current in power switching with load,and could be applied to the power supply system of spacesuit.