在一个项目中发现这样一个电路，交流输入经全桥SCR整流后再经过BOOST PFC，这个电路中只采集了BOOST 开关管的电流，而实际却可以显示出交流的输入电流、输入功因。不知道这个开关管电流和输入AC交流的关系是什么？
求大神指点
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