This paper describes the non-linear characteristic of output voltage and a method for determining carrier frequency. First, the linear region of the output voltage is determined by calculating the upper limit of the modulation factor (ali) for which the gate signal does not disappear. Second, the carrier frequency, which falls below ali, is determined by calculating the modulation factor that generates the rated output voltage and by calculating the compensation voltage that reduces the dead-time and impedance voltage. Third, the accuracy of the proposed design method is experimentally confirmed.
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