Novel Six-Step and Twelve-Step Current-Source Inverters with DC Side Commutation and Energy Rebound

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Abstract
Novel six-step and twelve-step current-source inverters (CSI) with dc side commutation and energy rebound capability are presented with detailed explanation of the circuit operation. The proposed inverters can operate in a very wide range of frequency and load variation by employing dc side commutation. Also, the energy rebound makes the use of low voltage silicon controlled rectifiers (SCR's) possible and increases the inverter efficiency. Unlike the dual current-source inverter, one auxiliary inverter with a power requirement of about one-half that of the main inverter is simply added to the six-step CSI in order to obtain a twelve-step CSI. Motor operation is possible in four quadrants in both six-and twelve-step inverters. The advantages of the proposed CSI's over conventional ones are described, and experimental results are given in oscillograms.

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