| Abstrakt: |
Harmonic components included in the output waveforms of inverter circuits cause magnetic noise, that is, audio noise, from the output transformers or load motors. To estimate the magnetic noise due to the harmonic components, we have already proposed the equivalent noise voltage E8 and current I8. In this paper, by applying the aforementioned E8, we compare quantitatively the magnetic noise in the various ordinary voltage-source inverters, both PWM inverters with multipulse waveforms and PAM inverters with multistep waveforms. Then, to reduce the magnetic noise, the output waveforms of the PWM inverters are improved by applying E8 into the idea of harmonic elimiation. Moreover, by employing PAM system as voltage regulation in the aforementioned method, the more improved output waveforms can be obtained with lower noise and also lower distortion. [ABSTRACT FROM AUTHOR] |
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