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问题：在VIN过零点处，桥堆的二极管反向截止，这个时候应该原边不在有电流输入，但是从测试波形来看，电感电流似乎仍在上升和下降，但是驱动又是不完整的，那电感上的电流是哪里来的，又去向何处，希望大家能指点迷津，谢谢。
