Enhanced Single Pulse Width Modulation for Achieving Wide-Range ZVS and High Efficiency in Multi-Active-Bridge Converters

초록

This paper proposes an advanced single pulse-width-modulation (SPWM) control method for multi-active-bridge (MAB) converters to reduce conduction and switching losses. The proposed algorithm achieves soft switching over the entire load range while minimizing RMS currents and conduction losses, especially under light-load conditions. By using two control variables - the zero-voltage turn-on intervals for the primary and secondary sides (α and β) and the phase shift (φd) between bridges - ZVS is maintained and overall losses are minimized. The proposed scheme simplifies the control process, reducing computational complexity compared with conventional MAB algorithms. Simulation and experimental results at 10 kHz and 30 kW verify that the method consistently achieves soft switching and minimizes RMS currents under various conditions.

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