采用Boost的PFC电路输出电压纹波分析及输出滤波电容值的确定

OUTPUT VOLTAGE RIPPLE ANALYSIS AND FILTERING CAPACITANCE DETERMINATION OF THE PFC CIRCUITS USING BOOST

本文对采用Boost为主电路的PFC电路进行分析,推导出输出电压纹波的数学表达式,进而找出了确定输出滤波电容的计算公式,公式对各种方式控制的Boost PFC电路普遍适用,计算机仿真证明结论的正确性。

This paper analyzes the PFC circuits that uses the Boost as the main circuit. It derives the mathematic expression of the output voltage ripple, and finds out the calculation formula for determining the value of the output filtering capacitor. The formula applies to any Boost circuits with different control mode. The result is proved by a computer simulation.