Dead-time elimination of pwm-controlled inverter/converter without separate power sources for current polarity detection circuit

This paper will present a dead-time elimination scheme for PWM-controlled inverter/converter. The presented dead-time elimination scheme doesn’t require separated power supplies for wheeling current detection of high-side and low-side power devices. The presented scheme includes the freewheeling current polarity detection circuit and the PWM control generator without dead-time. It will be shown that the presented scheme eliminates the dead-time of PWM control for inverter/converter and therefore dramatically improving the output voltage loss and current distortion. Experimental results derived from an FPGA-based PWM-controlled inverter are shown to demonstrate the effectiveness.