Dead-time compensation strategy for permanent magnet synchronous motor drive taking zerocurrent clamp and parasitic capacitance effects into account

A dead-time compensation strategy is presented for a permanent-magnet synchronous motor drive taking zero-current clamp and parasitic capacitance effects into account. To improve the performance of dead-time compensation around the zero-crossing point of phase current, two strategies are proposed. One is to correct failure in polarity reversal of the dead-time compensation voltage (DTCV) caused by the zero-current clamp phenomenon. The other is to adjust the amplitude of DTCV to deal with variation in transition time due to the parasitic capacitance of switching devices. Experimental results demonstrate that current ripple for the proposed dead-time compensation strategy decreases by half compared with that of the conventional method.