单相有源PFC开环控制的研究

Research on Open Loop Control of Single-Phase Active Power Factor Corrector

在单相有源PFC领域,截止目前,出现了多种控制方法,可以归类于开环控制和闭环控制,各有优缺点和所适用范围。在分析一种无需输出电压检测的单相PFC控制原理的基础上,提出和分析了一种只需检测整流桥后正弦半波电压和输出阻抗的开环控制策略,适合单级有源PFC和多级交错有源PFC,通过调节输出电压平均值与输入电压有效值之比,可以获得输出电压相对输入电压或输出功率的跟随特性,也可以维持输出电压平均值不变,在利用MATLAB/Simulink仿真分析后,基于DSPTMS320F28335设计了一种单相有源PFC的开环数字控制电路,建立实验平台进行实验测试。所得的仿真与实验结果符合相关的理论分析。

By now, in the field of single-phase active power factor correctors （ PFC ） , there are many control methods, which can be summarized into open control and closed control with their different merits and applicable scopes. In the paper, on the basis of the analysis of a single-phase active PFC principle needless of output voltage detection, an open loop control strategy is presented and analyzed only needing detection of post-bridge sinusoidal half-wave voltage, which can bring about follower characteristics versus input voltage and output power by means of regulation of the ratio between the mean output voltage and the RMS input voltage, and can also maintain the mean output voltage. After the simulation analysis by MATLAB/SIMULINK, a single-phase active PFC open digital control circuit based on DSP TMS320F28335 is designed and built into experimental platform and tested. The gained simulation and implementation results prove the theoretical analysis.