本文提出了一种新的单相双Boost拓扑结构和相应的系统控制策略,并将其应用于APFC中。系统采用DSP实现全数字控制。分析了主电路的拓扑结构及相应的控制模式,提出了基于数字控制的PFC的实现方法。分析表明,上下双侧PFC电路可以进行独立控制,且双侧直流母线电压分别仅与本侧的控制相关。理论分析和实验结果均表明,该系统具有很高的输入功率因数和较小的输入电流谐波,而且可以获得稳定的直流母线电压。
A novel single phase bi-boost topology with the controlling strategy, which applied in APFC system adopting DSP control,is presented in this article. And the structure and control mode of main circuit of such topology are analyzed and the realization of PFC based on digital control is also introduced. Theoretical analysis and experimental results show that higher input power factor and lower input harmonic current could be realized with stable DC bus voltage.