Output Voltage Ripple Analysis for Modular Series Parallel Resonant Converter Systems with Capacitive Output Filter

In this paper, an analysis of the output voltage ripple of modular series parallel resonant converter systems with capacitive output filter is presented. An analytical description of the output voltage ripple of output series, output parallel as well as output parallel-output series connections of series parallel resonant converter basic modules is given. The derived equations can be used for investigating the voltage ripple due to component tolerances and non-optimal interleaving angles. The analytical results obtained by simulations and calculations match well with the measurement results. The verification of the determined equations is performed for different switching frequencies over the full range of possible interleaving angles. The measured results also match well for the time dependent waveforms.