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以下图应用来说明,IN+-测量的是load负载的电流,VBUS检测的是负载的供电电压,负载的供电电压与负载的电流相乘得到负载消耗的功率;
IN+-测到的电压是Rshunt电阻两端的电压,乘以电流是电阻Rshunt消耗的功率;
如果您要获得被测回路负载的功率,那么就需要知道VBUS电压。