EMI mitigation in power electronic circuits operating at high power factor

A quasi-resonant boost stage has been inserted at the front end of a power converter to improve the input side power factor, reduce the switching losses as well as reducing the EMI. The maid idea is to show the superiority of quasi-resonant boost stage over the hard-switched boost stage with respect to performance indices such as the power factor, switching losses and EMI. An optimized design has been used for the resonant tank of the quasi-resonant stage to get the maximum advantage. Computer simulations have been carried out to support the theory. Hardware has been developed to experimentally verify the advantages of the proposed scheme.