Abstract
A novel DC/AC power converter for variable-speed AC motor drives using the zero voltage switching technique is described. This converter combines the advantages of soft commutated inverter and those of conventional PWM (pulse width modulation) control inverters. In the proposed scheme the soft commutation reduces the constraints on the switches and the PWM enables simple and efficient regulation of the power flow. Furthermore the zero voltage switching technique makes operation very safe, and switching bipolar transistors at 20 kHz is easily achieved without compromising the efficiency of the system. >
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