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how to calculate the PF from this picture

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jackym

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how to calculate the PF


I feel difficult to calculate the PF from this picture .The picture is the simulated result of a buck circuit. In Candence, I use the average of the power to divide the
product of the Vrms and Irms. The PF only have 0.5, I feel it's wrong .:|But I don't find the cause.I want someone help me . Thank you![/img][/quote]
 

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