Analysis and passivity-based control of zero-voltage-transition PWM converters

A zero-voltage-transition pulse-width modulation (ZVT-PWM) converter composes of a conventional PWM circuit and a resonant tank to achieve zero-voltage switching, resulting in low voltage and current stresses and zero capacitive turn-on losses. In this paper, the analysis and passivity-based control of the ZVT-PWM buck converter are presented. A generalized state space average model of the ZVT-PWM buck converter is derived. The controller design is carried out using the derived model and follows the "energy shaping plus damping injection" ideas of the passivity-based approach. Both direct and indirect output voltage regulation schemes are addressed. Simulation results are presented to illustrate the features of the proposed controllers.