POWER FACTOR CORRECTION WITH BOOST RECTIFIER

Conventional AC/DC power converters that are connected to the line through full-wave rectifier draws a non-sinusoidal input current. These Harmonic currents flowing through the impedances in the electrical utility distribution system can cause several problems such as voltage distortion, heating, noises. These harmonics distort the local voltage waveform, potentially interfering with other electrical equipment connected to the same electrical service and reduce the capability of the line to provide energy. This fact and the presence of standards or recommendations have forced to use power factor correction in power supplies. Boost regulators have been with us for many years as a power factor correction rectifiers. The main problem in boost rectifier is, the output voltage is very sensitive to Duty ratio variations. So maintaining the output voltage with in the regulation is very complex. Boost regulators are draws power from utility at unity power factor when it is operated in continuous conduction mode.