Feedforward Deadtime Compensation Using Current Zero Crossing Detection

A feedforward deadtime compensation algorithm for inverters is proposed, utilizing current zero crossing detection (ZCD) to generate a current direction signal for the feedforward input. Conventional deadtime compensation relies on information from a standard current sensor, which may not capture current ripple behavior accurately due to latency, frequency response, and noise limitations. The ZCD and hardware logic circuits operate at extremely high speed, and the feedforward compensation algorithm has minimal computational requirements. Simulation results show a significant improvement in load current total harmonic distortion (THD). The proposed circuit was constructed, and hardware testing with a SiC inverter showed similar performance to simulation.