Zero-order switching networks and their applications to power factor correction in switching converters

This paper addresses the requirements of networks containing linear inductors, capacitors and ideal switches for synthesis of zero-order input impedance. Sufficient conditions for achieving zero-order input impedance are stated in terms of the network topology and the switching sequence. Such networks have direct practical relevance to power factor correction (PFC). Based on zero-order switching networks, a comprehensive study is presented for many existing PPC circuits as well as new circuit topologies.