Modelling, simulation and experimental investigation of a new two input, seriesparallel switched capacitor converter

A new series-parallel switched capacitor converter topology capable of operating off two independent inputsources and generating target output voltage in buck or boost mode is presented. Operation principle, conversion ratios,modelling considerations in different operation modes and extensive loss analysis are derived. The converter is robustand may be operated off one or two input sources, having the ability to change conversion ratio over a wide range. Theproposed model assumes that the conduction losses are proportional to the average current flowing through each of thecharge pump capacitor in a switching phase. Capacitor current instantaneous waveform in the complete charge, partialcharge and no charge modes are captured in simulation and experiment. Model predicted equivalent resistance, outputvoltage and instantaneous capacitor current waveform concur excellent with simulated and experimental values,rendering the new converter as an excellent candidate for two and single input source applications.