改进型倍压Boost PFC变换器的MCM控制算法研究

摘要

普通的倍压Boost PFC变换器因具有输入电流连续、电磁干扰小等优点而作为半桥逆变器的前端得到广泛运用，但其拓扑的开关管和电感在工频周期内未得到充分利用。本文针对普通倍压Boost PFC变换器的缺点提出一种改进型倍压Boost PFC变换器，同时引入混合导通模式控制算法控制此新型变换器，有效地降低了输入电流的畸变率(THDi)，使系统在全功率范围内均能得到一个较好的PFC效果。最后搭建1kW的改进型倍压Boost PFC试验样机，并在该平台上验证了混合导通模式控制算法的可行性。%Because of the continuous input current and small electromagnetic interference, conventional voltage doubler Boost PFC converter has been widely applied in the front-end stage of half-bridge inverter. But this conventional converter is not taking full advantage of its switches and inductances. A modified voltage doubler Boost PFC is presented inthis paper aiming to make up the shortfall. Besides, the Mixed Conduction Mode Algorithmis adopted to improve the quality of the input current of the novel converter, and a good resultis obtainedduring the full power range. Finally, a 1KW experimental prototypeisset upto verify the feasibility of the MCM Algorithm.