This paper proposes a digital average current-mode control
method in discontinuous conduction mode (DCM) power factor correction
rectifier. The proposed control technique does not estimate, but directly
senses the average value of the inductor current in each switching cycle. It is
implemented by means of a conventional current sensing circuit and a
microcontroller. The calculation burden of the microcontroller is the same with
that of conventional two-loop-controlled converter because the additional calculation
process is not required. The control method achieves lower total harmonic
distortion and higher power factor than the conventional technique.
Experimental results with a 200-W prototype verify the feasibility and
performance of the proposed control method.
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