LAUSR

Common-mode voltage produced by voltage source inverters (VSI) is of great concern in motor drive systems. Significant amount of conducted common-mode/bearing current will be induced and will interfere with system operation. As an alternative to inserting bulky passive filters to combat the adverse effect by common-mode voltage, this paper proposes a new topology of integrated active zero-state switch (IAZS). Minor adjustment to the standard space vector pulse-width modulation (SVPWM) is proposed to facilitate the use of IAZS, which enables common-mode voltage reduction in VSI-fed motor drives. Simulation and experimental results on a commercial VSI are presented as proof of concept to validate the effectiveness of proposed design in common-mode voltage reduction.