Averaged modeling and analysis of resonant converters

An averaged modeling and analysis method for resonant power converters is described. The method is based on the slowly varying amplitude and phase transformation. Application of such a transformation to the state space model of a resonant power converter leads to a new transformed model where all state variables are slow variables. The averaging method is then applied to the transformed model to derive an averaged model. Various kinds of analysis and controller design can be carried out using the averaged model. The method is discussed in detail, and a series resonant power converter is taken as example to demonstrate the application of the method