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关于软启动电阻的问题



大家好 关于驱动电路设计 想请教大家一下软启动电阻应该如何设计

外部供电是24V或者48V的直流电源,三相桥的母线支撑电容是两颗220uF的电容并联,电源和电容之间加了继电器,如下图所示

电容上电瞬间低阻抗,请问应该如何设计软启动电阻呢?