A Unified Model For Auxiliary Switch Commutated DC-DC Converters

A novel ZVS auxiliary switch commutated variation for all DC-DC converter topologies has been proposed in 2006. With proper designation of the circuit variables (throw current I and the pole voltage V), all these converters are seen to be governed by an identical set of equations. With idealized switches, the steady-state performance is obtainable in an analytical form. The conversion ratio of the converter topologies is obtained. A generalized equivalent circuit emerges for all these converters from the steady-state conversion ratio. It also provides a dynamic model as well. With these generalized steady-state equivalent circuits, small signal analysis of these converters may be carried out readily. It enables one to use the familiar state space averaged results of the standard PWM DC-DC converters for the resonant counterparts. The DC and AC models reveals that DC and low frequency behaviour of the proposed family of converters is similar to that of its PWM parent.