Detailed Analysis of Magnetizing Inductance Effects in Interleaved PDM-Controlled Modular Resonant Converters

This paper analyzes the effect of magnetization inductance in matching transformers on the output currents of modular resonant converters with voltage-source inverters under interleaved pulse-density modulation. A simplified equivalent circuit is used to study current distribution distortions. The findings, supported by mathematical modeling, simulations, and experiments, demonstrate that while the impact is minimal at full pulse density, it becomes significant at reduced density, resulting in waveform distortion, amplitude imbalance, and phase beating. Recommendations for accurate waveform modeling are also provided to improve the reliability and performance of such converters.