DC and AC characteristics of zero voltage switching PWM converters

The authors present an equivalent circuit model for zero voltage switching resonant transition (ZVS-RT) converters operating with constant frequency which takes into account the RT interval. The analysis is carried out by relating the terminal currents and voltages, through the definition of switching functions of the power switches responsible for the ZVS action an equivalent DC circuit model is generated from these relationships. This model is simple and accurate, and can be used to analyze the DC characteristics of the three basic topologies using ZVS-RT: buck, boost, and buck-boost. This technique can be extended to improve the small-signal analysis of these converters, and it can be applied to converters using bipolar junction transistors as switching devices to account for the impact of the switching times of the devices.<
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