International Journal of Electronics Engineering Research

This paper introduces novel digital and analog power factor correction techniques for single phase boost converter using pulse width modulation. It attempts to bring the input voltage waveform and input current waveform in phase with each other. In digital technique, switching is carried out using digital signal processor TMS320F2812. In analog technique, it is implemented using IC UC3854. In both these algorithms, the required duty cycles to achieve unity power factor are calculated and a boost converter is controlled by the pulses with pre-calculated duty cycles to achieve sinusoidal input current waveform. Also the input voltage feed-forward compensation network makes the output voltage insensitive to the input voltage and guarantees sinusoidal input current even if the input voltage is distorted. The said converter enhances a power factor correction from 49.80% to 98.40% for a load of 120 watts and 50.00% to 99.30% for a load of 400 watts.