A zero-current-switching based three-phase PWM inverter havingresonant circuits on AC-side

摘要

The authors present a zero-current-switching (ZCS)-basedthree-phase PWM (pulse-width-modulated) inverter having small resonantcircuits on the AC side, whose resonant frequency is 50 kHz. The ZCSinverter can greatly reduce the switching losses and electromagneticnoise. The principle of ZCS operation, the design of the resonantcircuits, and the control sequence are described from theoretical andpractical points of view. Experimental results obtained from a ZCS PWMinverter driving an induction motor of 2.2 kW are shown to verify thepracticability of this device