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UCC2818D问题波形

UCC2818D做1KW PFC,满载时电流波形异常,在交流波形峰值时,PWM出现丢失,好像峰值电流保护,请大家帮忙看一下,是什么问题导致的,下图是电感电流波形,

 

 图1:加载950W,前半部分和后半部分正常,交流峰值出现异常

图2:正常部分的电感电流波形

图3:异常部分的电感电流波形