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减小DCMBoostPFC变换器储能电容的方法

, PP. 172-181

Keywords: DCM,Boost,PFC,储能电容量,三次谐波注入

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Abstract:

在DCMBoostPFC变换器中,输入电流含有初始相位与基波电流相差π的三次谐波,不仅功率因数较低,且需要更大的输出储能电容。本文提出一种控制方法,在整个输入电压范围内可以使输入电流仅含有一定量的与基波初始相位相同的三次谐波。与定占空比控制相比,在满足IEC61000-3-2,ClassD谐波标准要求的情况下,可以将储能电容量降低为原来的37%。在满足EnergyStar对功率因数要求不低于0.9标准的情况下,输出储能电容最多可以减小为原来的43%。为了简化实现电路,本文进一步提出一种拟合占空比的方法。实验结果验证了理论分析的正确性。

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