This paper proposes a novel ideas of 10 kW 200 kHz power amplifier using the switching technology of Multilevel inverter by compensating dead time. Its amplifier is composed of multiplexing 3 level inverter with interphase reactors. It has 81 switching patterns for 9 level of output voltage and two switching control modes in this proposed multilevel inverter. By employing this control method, the switching frequency can be reduced by about 1/8 of 200 kHz carrier frequency and the circulating current can be reduce within 1 ampere. The efficiency of this system is 95.6% at 4 kW and the THD is under 2% at 5 kHz output frequency with open loop control. Further, by applying the dead time compensation, and the carrier frequency is made to increasing at 400 kHz and realized 200 kHz frequency characteristic. This paper also presents the methods to improve frequency characteristics and distortion for arbitrary output waveforms of the system.
[1]
Isao Takahashi,et al.
Switching Type Power Amplifier Using Multilevel Inverter
,
2003
.
[2]
Yoshihiro Murai,et al.
Waveform Distortion and Correction Circuit for PWM Inverters with Switching Lag-Times
,
1987,
IEEE Transactions on Industry Applications.
[3]
Keiju Matsui,et al.
A Technique of Parallel Connections of Pulsewidth Modulated NPC Inverters by Using Current Sharing Reactors
,
1995
.
[4]
Hirofumi Akagi,et al.
A New Neutral-Point-Clamped PWM Inverter
,
1981,
IEEE Transactions on Industry Applications.
[5]
T.A. Lipo,et al.
On-line dead time compensation technique for open-loop PWM-VSI drives
,
1998,
APEC '98 Thirteenth Annual Applied Power Electronics Conference and Exposition.