100kHz, 10kW switching type power amplifier using multilevel inverter

摘要

This paper proposes a novel idea of 10kW 100kHz power amplifier using the technology of multilevel inverter. Its amplifier is composed of two pairs of 5level inverters with interphasa reactor. It has 81 switching patterns to contrast with 9level of output voltage and two switching control modes in this proposed multilevel inverter. By employing this control methods, the switching frequency can be reduced by about 1/8 times and the circulating current can be reduced within ±1 ampere with respect to the difference of output current 40 amperes. The efficiency of this system is over 93% at 10kW and the size is as follows: length is 350mm, width is 250mm, and height is 150mm. This paper also presents the effectiveness of the computer simulations, characteristics, and arbitrary output waveforms of the system.