中文摘要：

针对无桥功率因数校正（PFC）电路在传统控制算法下,由于升压电感位于电网交流侧而存在输入电流过零点畸变问题,提出了一种新的高功率因数控制策略。在新控制策略下,避免了无桥PFC电路在输入电压过零点处输入电流畸变,同时使输入端达到很高的功率因数。论文详细分析了传统控制算法下无桥PFC输入电流过零点畸变的原因,推导了输入电流畸变的时间范围,讨论了影响输入电流THD的相关因素,然后比较了两种控制策略下电源的PF值和输入电流THD,最后通过仿真和实验验证了新型控制策略在抑制电流谐波畸变率方面的正确性和优越性。

英文摘要：

A new high power factor control strategy is discussed with the aim of avoiding the distortion problem of input current of bridgeless PFC when the input voltage is crossing zero line due to the boost inductor on the AC side of the grid. Under the new control strategy input current distortion is avoided and high power factor is achieved.The reasons of the distortion are discussed. The input current THD and PF expressions are derived. The performance of the novel control strategy is investigated through experiment and simulation.