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UCC28019电流波形异常

Other Parts Discussed in Thread: UCC28019

  TI工程师,你们好。我使用UCC28019搭建了一个输入AC20V,输出DC36V、100W的PFC电路。现在电路能够稳定输出36V,但输入侧电流波形异常

  如下图所示,黄色为AC24V输入电压,蓝色是电流(使用电流探头测得)

而且,发现在加重负载后,波形有所好转

请问,电流波形的异常是什么导致的,该如何解决?