Three-Level Current-Source PWM Inverter with No Isolated Switching Devices for Photovoltaic Conditioner

概要

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This paper presents a new configuration of a three-level current-source PWM inverter (CSI) with a full common-source or common-emitter topology in terms of all transistor switching devices. Using this new configuration, the number of gate or base drive power supplies can dramatically be reduced to only a single instead of use of several isolated power supplies or conventional bootstrap circuits. As a result, bulky, heavy and expensive transformers and capacitors in the drive circuits are eliminated. In addition, the proposed configuration is capable to be operated at a higher switching frequency and a higher voltage without violent potential changes because of its common-source or common-emitter topology. Design and operation principle of the new circuit are investigated and analyzed using computer simulations. Finally, effectiveness of the circuit is experimentally verified by using a laboratory prototype set up. The simulation and the experimental results show that the circuit works properly to generate a three-level output current waveform, which proves feasibility of the proposed approach.
電気学会の論文
2009-05-01