Monday, 21 December 2015

Unity Power Factor AC–DC Power Converter

·          This article presents a power converter and its control circuit for high-frequency-fed ac to dc conversion.
·        Based on the resonant technique, the input current is shaped to be sinusoidal and is forced to follow the high-frequency sinusoidal input voltage so as to achieve unity power factor.

·        With the proper selection of the characteristic impedance of the resonant tank, the converter is able to perform the function of a buck, boost, or buck–boost converter.
·         The initial condition of the resonant tank is used to control the output voltage gain of the converter.


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