Novel Online Parameter Tuning Method for Digital Boost PFC With Transition Current Mode

摘要

A new online parameter tuning method for digital power factor corrector (PFC) with transition current mode (TCM) control is proposed in this paper. The proposed method copes with the parameter variation issue, which results in discontinuous current mode operation and larger current ripple. The proposed method is to give one more current sample in one sampling period in order to estimate the inductance of a boost inductor online, thereby tuning the parameter of the predicted switching period. It will be shown by experimental results that the proposed online parameter tuning method can retain TCM operation even under full-load condition and slightly increase the converter efficiency. Experimental results derived from a digital-signal-processor-based controller are presented for confirmation. The PFC is with 270-W power rating, 100-V/50-Hz input, and 385-V/dc output. Experimental results demonstrate the effectiveness of the proposed online parameter tuning method for digital PFC under TCM control.