提出了一种基于正弦平方项补偿的峰值电流控制临界连续模式(cRM)反激功率因数校正(PFc)变换器控制策略。所提出的控制策略消除了传统CRM反激PFC变换器输入电流的波形失真,使变换器获得单位功率因数(PF)和低总谐波畸变率(THD)。分析了改进峰值电流控制CRM反激PFC变换器的工作原理及工作特性,并通过30w实验样机进行了验证。实验结果表明,相比于传统CRM反激PFC变换器,改进型峰值电流控制CRM反激PFC变换器在整个输入电压范围内具有更高的PF和更低的THD。
A peak current control strategy with sine square compensation for critical conduction mode (CRM) flyback power factor correction(PFC) converter is proposed.Input current distortion of CRM flyback PFC converter can be co- mpletely eliminated and unity power factor (PF) and low total harmonic distortion (THD) can be obtained by using proposed control strategy.The operation principles and characteristics of CRM flyback PFC converter using proposed control strategy are analyzed and verified by experimental circuit of 30 W.The experimental results show unity PF and total THD of the CRM flyback PFC converter using proposed control strategy are better than those of traditional CRM flyback PFC converter.