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UCC28070两路的电感电压波形不正常

每50Hz才进行一次PF调节(整流后频率100Hz),每次调节时MOS管开关频率200KHz,但Vbus电压由380V降到290V,PF也只有0.58(一直跳变),为什么会这样,貌似跟电感值(220uH)没有太大联系。具体电压波形如下

原理图如下: