A structural approach to synthesizing,analyzing, and modeling quasi‐resonant converters

This paper presents a structural approach to synthesizing, analyzing, and modeling quasi‐resonant converters (QRCs) based on the concept of basic converter units (BCUs). Typical QRCs include the well‐known topologies of buck, boost, buck‐boost, Cuk, Zeta, and Sepic. With proper reconfiguration, these QRCs can be synthesized from either buck‐QRC BCU or boost‐QRC BCU plus certain linear networks. Thus, the BCUs and general configurations of the converters can be identified. Analysis of steady state operation and derivation of small‐signal models for the converters then can be conveniently performed from the general configurations, reducing the complexity significantly. Moreover, the proposed structural approach can explore more physical insights into the converters in a family, and can reveal more relationships among converters over conventional approaches. Copyright © 2011 John Wiley & Sons, Ltd.