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中文摘要：
提出两开关伪连续导电模式（pseudocontinuousconductionmode，PCCM）Buck-Boost功率因数校jE（powerfactorcorrection，PFC）变换器及其控制策略。利用两开关PCCMBuck．BoostPFC变换器电感惯性模态所提供的一个额外控制自由度，可实现单位功率因数控制，并明显改善传统单开关Buck-BoostPFC变换器、两开关连续导电模式（continuousconductionmode，CCM）Buck．BoostPFC变换器和两开关不连续导电模式（discontinuousconductionmode，DCM）Buck-BoostPFC变换器的性能。与两开关DCMBuck．BoostPFC变换器相比，两开关PCCMBuck．BoostPFC变换器减小了电感电流纹波。仿真与实验结果表明，两开关PCCMBuck-BoostPFC变换器的负载动态响应速度明显快于传统的两开关CCM和DCMBuck-BoostPFC变换器。
英文摘要：
A novel two-switch Buck-Boost power factor correction （PFC） converter operating in pseudo continuous conduction mode （PCCM） and its corresponding control strategy were proposed in this paper. The two-switch PCCM Buck-Boost PFC topology provides an additional degree of control freedom to realize PFC control, which can offer significant performance improvements over single-switch Buck-Boost PFC converters or two-switch Buck-Boost PFC converters in continuous conduction mode （CCM） and discontinuous conduction mode （DCM）. The additional degree of control freedom introduced by inductor current freewheeling stage helps to achieve unity power factor control. Besides, inductor current ripple of the two-switch PCCM Buck-Boost PFC converter, which is lower than that of the two-switch DCM Buck-Boost PFC converter, can be obtained. Analysis, simulation and experiment results of the two-switch PCCM Buck-Boost PFC converter were presented. The experiment results show that the dynamic response of the two-switch PCCM Buck-Boost PFC converter is significantly faster than that of the two-switch CCM and DCM Buck-Boost PFC converter.
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