在用2801做的PFC,开关频率为45k,现在弱电调试时,周期过零装载没有问题,但加强电工作时出现满脉宽,感觉失控(程序中限制占空比50%)。 改为立即装载(程序中其他未动),加强电工作时不会出满脉宽。不知是何原因?请专家把把脉。
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