The non-zero vector pulse width modulation (NZVPWM) wave technology suppresses the common-mode voltage (CMV) of the three-phase inverter. But its dead zone effect can cause the failure of common-mode suppression. An improved active zero space vector pulse width modulation (AZSVPWM) technology is proposed, and the dead zone constraint conditions which can achieve full modulation are analyzed. By setting a reasonable dead zone range, the common mode voltage can be effectively suppressed in a wide modulation range. The simulation and experimental results verify the validity of the analysis.