Abstract
The paper presents the new current source inverter (CSI), of which the commutation period and the voltage across the commutating capacitors can be controlled by using GTO thyristors having gate-turn-off capability. In the conventional CSI which feeds the inductive load such as an induction motor, the voltage across the commutating capacitors depends on the capacitance of the commutating capacitor and the external load condition. In the proposed inverter, the peak capacitor voltage can be kept lower than that of the conventional CSI, by varying the on-off time ratio of GTO thyristors. In the paper, the operating principle and experimental results of the new CSI are described. It is shown that the inverter efficiency of the new CSI is higher than that of conventional one. Also the steady-state characteristics of this CSI-induction motor drive system are analyzed and a comparison between the analyzed and experimental results is given.
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