Near Unity Power Factor Using Non-inverting Boost-Buck Converter with Programmed PWM

This paper presents how to implement non-inverting boost-buck converter to achieve near unity power factor application. The advantage of the proposed converter is that it has continuous currents at both input and output, and its gain can be adjusted to higher or lower than unity. Steady state operation of the converter is also described by using circuit simplification. Since its input current is continuous, it can be applied for power factor correction. This work shows how to make the input current to have the current from ac source close to sinusoidal waveform with the same phase. In order to achieve that, programmed PWM technique is used to control the switches in the converter. Computer simulation is also given to confirm the work.