该文针对数字滞环控制PFC 电路中存在电流脉动较大的问题，提出了一种电流脉动最小化的算法。通过计算出电流上升、下降的斜率，并结合电流采样值，实时的计算出每个开关周期的占空比。另外，该文针对数字系统离散采样的特点，根据每个开关周期的占空比调整相应的电流采样点，以保证电流采样的精度。实验结果表明，该文提出的电流脉动最小化算法可以减小开关周期内的电流脉动，同时保证系统的快速响应性。 ABSTRACT: Due to the large current ripple of PFC based on digital hysteresis control, this paper proposes a novel control arithmetic for current ripple minimum. Calculating the slope of current raise and fall, duty cycle can be worked out real-time with help of the current sampling value. In addition,considering the characteristic of digital sampling, this paper proposes a method that the point of current sampling during every switching period can be adjusted based on duty cycle, and it can ensure the precision in sampling process. Experimental results prove that this control arithmetic can decrease the current ripple with fast response based on digital hysteresis control. KEY WORDS: Power electronics; Hysteresis; Power factor correction(PFC); Current ripple; Duty cycle
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