下面是PFC的电流采样电路，能简短的分析下吗？ 为何IIN_SENSE的电流测出来是个正值？ 我空载时PFC的电压能达到395，但是过了几分钟后 IIN_SENSE的电流测出来是个负值,PFC不工作了，输出只有300
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