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The Study on the HBML Inverter Using the Cascaded Transformers  

박성준 (전남대 전기공학과)
박노식 (전남대 일반대학원 전기공학)
강필순 (일본 오사카대학 전기공학)
김광헌 (전남대 전기공학)
임영철 (전남대 전기공학)
김철우 (부산대 전자전기통신공학부)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.9, no.4, 2004 , pp. 334-340 More about this Journal
Abstract
In this paper, an efficient switching pattern to equalize the size of transformer is proposed for a multi-level inverter employing cascaded transformers. It is based on the prior selected harmonic elimination PWM(SHEPWM) method. Because the maximum magnetic flux imposed on each transformer becomes exactly equal each to each, all transformers can be designed with the same size regardless of their position. Therefore, identical full-bridge inverter units can be utilized, thus improving modularity and manufacturability. The fundamental idea of the proposed switching pattern is illustrated and then analyzed theoretically. The validity of the proposed switching strategy is verified by experimental results.
Keywords
cascaded transformers; magnetic flux; multi-level inverter; power distribution; new switching angel technique;
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