EMI mitigation in power electronic circuits operating at high power factor

A quasi-resonant boost stage has been inserted at the front end of II power converter to improve the input side power factor, reduce the switching losses as well as reducing the EMI. The main 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. 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.