具有宽负载范围的新型Boost功率因数校正器

摘要

To extend the load variation range of Boost PFC converter operating in DCM and CCM, a novel PFC converter operating in pseudo continuous conduction mode （PCCM） is proposed. The operation of PCCM Boost converter is analyzed and its large signal model is established. Based on which, the digital valley current control strategy of current loop and PI compensation of voltage loop is designed. The PCCM Boost PFC converter can achieve high power factor over a wide load variation range. The performance of PCCM Boost PFC converter and CCM Boost PFC converter is verified and compared by using a 70-400W experimental prototype.%针对不连续导电模式（DCM）和连续导电模式（CCM）BoostPFC变换器存在负载范围受限的问题，提出了一种工作在伪连续导电模式（PCCM）的新型Boost功率因数校正变换器。分析了PCCMBoost变换器的工作过程，建立了PCCMBoostPFC变换器的大信号模型，在此基础上设计了数字谷值电流控制策略和电压环PI调节器。该变换器可在较宽的负载范围内实现高功率因数。通过一台输出功率范围为70-400W的实验样机，对PCCMBoostPFC变换器和CCMBoostPFC变换器的性能进行了对比和验证。