一种简化的单相Boost PFC变换器的功率因数测量方法

摘要

在对单相Boost PFC变换器进行实验研究的基础上，建立了输入电压与电流的等效模型，并基于该模型提出了一种简化的功率因数测量方法。相比于传统的功率因数测量，该方法只需要采样输入电流信号即可实现功率因数测量，不仅测量方便，而且为DSP节省了大量运算时间。最后制作了一台样机，实验结果显示，在全负载范围内，该方法测量结果和功率分析仪的测量结果之间的误差小于3%。因此在单相Boost PFC变换器功率因数测量的场合，可以推广使用该测量方法。%On the basis of experimental research on single phase Boost PFC converter, this paper proposed the input voltage and current model based on which it developed a simplified power factor measurement method. Compared with traditional method, this simplified one can not only realize power factor measurement only by sampling the input current, but make the measuring process more convenient and effective by saving lots of operation time. With a prototype being built, the experimental result shows that the measured result error between this method and power analyzer is within three percentage over full load range. Therefore, this method can be applied in those power factor measurement field of single phase Boost PFC converter.