--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.

-A comparison study was conducted to characterize the loss mechanisms, component stresses, and overall efficiencies of a group of voltage-mode softswitching PWM methods including two newly developed methods. All soft-switching methods in the selected group allow zero voltage turn-on and turn-off of the main switch and utilize a single auxiliary switch with some resonant components. Advantages and disadvantages are identified for each method. Experimental verification for each soft-switching method are provided. It was found that not all the existing methods improved efficiency over most of the load range, but only those methods that softly switch the auxiliary switch, minimumize redirection current, and recover the auxiliary circuit energy.

-A comparison study was conducted to characterize the loss mechanisms, component stresses, and overall efficiencies of a group of voltage-mode softswitching PWM methods including two newly developed methods. All soft-switching methods in the selected group allow zero voltage turn-on and turn-off of the main switch and utilize a single auxiliary switch with some resonant components. Advantages and disadvantages are identified for each method. Experimental verification for each soft-switching method are provided. It was found that not all the existing methods improved efficiency over most of the load range, but only those methods that softly switch the auxiliary switch, minimumize redirection current, and recover the auxiliary circuit energy.

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