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28070做的1500W pfc电源,在输入电压100V以下,mos电流波形异常



28070做的1500W pfc电源,在输入电压100V以下,mos电流包络馒头波的上升阶段会出现异常凸起,负载从轻载突变为满载时这个凸起值会超过馒头波峰值。调外围元件电流环参数无改善,改限制占空比为小于0.7及减小imo外加电阻值有改善,但不能消除。请问是什么原因?是否与平均电流控制模式有关?