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ucc28070低压工作,输入电流和电压在峰值处都畸形了是怎么回事?

大家好,这周遇到个问题如题. 在220交流工作还正常,带载到1200W都没问题. 低压110交流的时候却只能带载300W,随后输入电流和电压都在峰值处有很明显波纹,抖动的厉害,继续加载会爆mosfet的. 我的交流输入是个3kw的调压器,电压变形时调压器也会发声,应该是电流瞬间过大. 晚上贴个照片.

希望有人能给建议,谢谢.