【摘要】 对在斩波型PFC变换器中的交流输入电流存在的低频谐波和高频谐波进行二重Fourier分析,得到输入电流频谱.据此设计了相应的输入滤波器.实验结果表明:理论分析及设计可行.对市电频率的输入电流,滤波器引入的相移不大于3.3°,衰减几乎为0;而对高频谐波,衰减可达50dB.更多还原

【Abstract】 In a chopping PFC converter, AC input currents consist of two of kinds of harmonics:integral time of line frequency and integral time of chopping frequency. The time scales of variation are quite different and considered as two independent time variables so that the input current spectra can be obtained by duplicating Fourier analysis. On this basis, a input filter is designed. Experimental results confirm the theoretical analyses and design. For the line frequency input current, phase-shift and attenuation introduced by the filter are no more than 3.3° and near 0 dB respectively. For the chopping currents, attenuations can reach 50 dB.更多还原