A Novel Reduced Current Amplitude Fluctuation PDM Control Strategy for Modular-Structured Series-Resonant Converters

This paper presents a novel reduced current amplitude fluctuation pulse-denisty modulation (PDM) control strategy for modular-structured series-resonant converters by combining the advantages of interleaved PDM, stepped PDM, and augmented PDM principles. The proposed strategy aims to mitigate the disadvantages of existing PDM methods. By introducing step-by-step changes in the pulse density in each channel of the converter while preserving the interleaving principle, the proposed strategy ensures more uniform power losses and lower fluctuations in the output current amplitude. Simulation results demonstrate the effectiveness of the proposed strategy in reducing current amplitude fluctuations.