DSP实现无输出电压采样的功率因数校正

Output voltage sensorless power factor correction based on DSP

提出一种无输出电压采样的功率因数校正(PFC)控制策略,它既不需要采样电感电流,也无需采样直流输出电压,输出电压由电压控制增益K直接控制,电路成本得到降低.由于该控制策略算法比较简单,故计算量大大减少,数字信号处理(DSP)速度与开关频率之间的矛盾得到缓解,可以提高PFC电路的工作频率.通过制作实验室模型,编写了DSP程序,利用TMS320LF2407A定点DSP,实现了开关频率为100kHz的单相PFC电路的数字控制,获得满意的效果.

A kind of PFC control strategy without detecting the direct current output voltage is put forward in this dissertation. Not only the inductance current, but also the Out put voltage does not need to be detected in this strategy. The output voltage is directly controlled by the gain K, so the cost is reduced. This control strategy is very simple in algorithm, so the computing amount is decreased. Thus the conflict between the speed of DSP and switching frequency is alleviated and it helps to raise the switching frequency. Finally the feasibility of the proposed control system is verified by a laboratory prototype based on TMS320LF2407A. The digital control of PFC with switching frequency 100 kHz is realized and satisfying result is achieved.