Improved small-signal analysis for the ZVT converter

A closed form, cycle by cycle analysis forms the basis for a new zero-voltage transition (ZVT) power converter small-signal model. The ZVT converter has an implicit "slew interval," making the converter dynamics difficult to analyze using traditional averaging techniques. The control to output transfer function for the ZVT converter using voltage-mode control does not exhibit a second order pole associated with the output L-C filter, in direct contrast to existing small-signal models for the ZVT converter. There is a characteristic pole dependent upon switching frequency and inductor values. This characteristic pole is independent of operating conditions and is fundamental to the ZVT converter. The new small-signal model is in excellent agreement with experimental results.