Analysis of Split-Capacitor Push-Pull Parallel Resonant Converter in normal mode

This paper presents a mathematical model through which the operation of a split-capacitor push-pull parallel resonant converter (SCPPRC) in conventional normal mode can be analyzed. The SCPPRC converter can also be operated with a variable switching frequency to provide a lower (Buck) or higher (Boost) peak load voltage than that which would result in the normal mode. The variable switching frequency is generated by incorporating a negative or positive variable time delay into the switching period of the normal mode. This paper describes the normal mode of operation, which is realized by switching the converter at its damped resonant frequency with zero time delay, and presents a complete mathematical model through which the performance of the converter can be accurately predicted. The validity of the proposed mathematical model is verified both by simulations and experimental results of a 50 Watt prototype SCPPRC converter.