Modelling a push-pull parallel resonant convertor using generalised state-space averaging

A generalised state-space averaging technique particularly suited to resonant convertor analysis is applied to a parallel resonant convertor topology which produces high frequency power from a DC source. The convertor uses two power transistors (IGBT) configured in a low-cost push-pull arrangement that features low RFI emission and high efficiency owing to the zero voltage switching and absence of circulating current in the devices. Linear state-space models for the convertor describing its harmonic and transient characteristics are derived and compared with-those obtained analytically and by experiment. Good agreement is observed in both cases thus validating the models