A New Current Source Inverter with Simultaneous Recovery and Commutation

A novel current source inverter which is believed to be more advantageous than the autosequentially commutated inverter is proposed. This current source inverter operates in a much wider frequency range with much lower voltage stress on the motor terminals and power devices. Simulation results show that the proposed current source inverter is superior (about fourfold) to the autosequentially commutated inverter in operating frequency range and in voltage stress. The proposed inverter requires only a small-size DC capacitor; thus the system cost is estimated to be considerably low. Since all of the commutation energy is returned to the load, the overall efficiency is also high. Experimental results are shown for a 5/sup 1///sub 2/ hp induction motor. >