A Unified Approach to Characterization of PWM and Quasi-PWM Switching Converters: Topological Constraints, Classification, and Synthesis

Topological constraints are obtained for PWM (under both continuous and discontinuous current modes) and quasi-PWM (includes families of quasi-resonant and quasi-square-wave) converters by identifying their tree structures. Switching sequence of these converters and a classification of quasi-PWM converters are presented. A dual circuit of an ideal diode and an ideal switch are proposed, and, they are used to obtain duals of the switching converters in one step. A procedure for the synthesis of quasi-PWM converters is also presented.