Properties and Synthesis of Passive, Lossless Soft-Switching PWM Converters

This paper derives general topological and electrical properties common to all lossless passive soft-switching converters with defined characteristics and proposes a synthesis procedure for the creation of new converters. The synthesis procedure uses the properties to determine all possible locations of the inductor and capacitor added to achieve soft switching. Then a set of circuit cells are used to easily add the additional circuitry to recover the energy stored in these elements. A family of soft-switching boost converters are given as an example of the synthesis procedure. Experimental waveforms are shown for a new soft-switching Cuk converter.