Constant Common-Mode Voltage Strategies Using Sigma–Delta Modulators in Five-Phase VSI

This article proposes and studies different sigma–delta ( $\Sigma$ notation="LaTeX">$\Delta$ ) modulation strategies for obtaining a constant common-mode voltage (CMV) by eliminating the CMV level transitions in five-phase source inverter (VSI). These techniques are based on choosing vectors that generate with values of 0.1 notation="LaTeX">$V_{\text{dc}}$ or –0.1 . Because high-switching frequencies used wide-bandgap semiconductors, pulse-width continually high d v /d xmlns:xlink="http://www.w3.org/1999/xlink">t values. Therefore, proposal to combine strategy vector selections achieves due elimination its transitions, reduction conducted electromagnetic interference high-efficiency converter operation. The average number switching per transistor VSI is analyzed using results from MATLAB/Simulink PLECS simulations. Experimental obtained applying proposed silicon carbide MOSFETs. demonstrate achievement aforementioned features.