四级交错单相有源功率因数校正器的研究

Research on Four-stage Interleaved Single-phase Active Power Factor Corrector

在家用变频空调等应用中,功率因数校正器(PFC)的功率等级越来越大。多级交错PFC可以有效地降低电源纹波电流,简化电感设计和提升系统效率。文中在描述这种PFC单周期控制原理基础上,提出了一种基于IGBT电流的电流合成方法,分析了四级交错并联PFC中IGBT占空比与纹波电流关系、输出滤波电容纹波电流和开关频率调制原理,并采用Matlab/Simulink进行了全面的仿真分析。为验证理论分析和仿真分析,基于RENESAS最新推出的模拟控制器R2A20104,设计和实现了额定输出功率8.0kW的四级交错PFC。结果表明,采用单周期控制、电流合成原理实现并联交错有源PFC是可行的,具有很好的输入端纹波电流抑制效果,且电感设计简化,并能提升系统效率。

In the application of household inverter air-conditions and so on, the power level of single phase active power factor correction （PFC） increases rapidly day by day. Multi- phase interleaved PFC can effectively reduce the line ripple current, simplify inductor design and can enhance efficiency. The paper firstly describes the one cycle control principle, proposes a current synthesis method based on IGBT current, and then analyses the relationship between ripple current and duty cycle of IGBT. The output filter capacitor ripple current and switching frequency modulation principle in four-phase interleaved PFC are analyzed as well. In addition, the whole PFC system is simulated completely by means of Matlab/Simulink. In order to verify the theoretical analysis and simulation analysis, a two- phase interleaved PFC with a rated output power of 4.0kW is designed and implemented based on the latest analog control chip R2A20104 newly developed by RENESAS. The obtained results show that the interleaved PFC by means of one cycle control and current synthesis is practical, capable of reaching a good suppression effect of ripple current and being cost-effective.