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A study on reducing switching device of the HBML inverter using the transformers

In this paper, we proposed the electric circuit using one common arm of H-Bridge inverters to reduce the number of switching components in multi-level PWM inverter combined with H-Bridge inverters and transformers. And we proposed a switching method that can get same rate of usage at each transformer. We tested the proposed prototype inverter to clarify the proposed electric circuit and reasonableness of the control signal.