Abstract
A new on-line parameter tuning method for digital-controlled PFC with transition current mode 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 boost inductor on line and thereby tuning the parameter of controller. It will be shown by experimental results that the proposed on-line parameter tuning method can retain transition current mode operation even under full load condition and slightly increase the converter efficiency.
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