Experimental study reveals improved output waveforms and high efficiency in a three-phase PWM inverter, indicating simplified circuit architecture using turn-off thyristors.
A new pulsewidth-modulation method for a three-phase inverter is proposed. The method offers the advantages of a much simpler control logic circuitry and relatively high-quality waveforms of the output voltage. The use of high-power turn-off thyristors allows simplification of the power circuit construction and a reduction in size. The experiments using turn-off thyristors with a rating of 1200 V and 50 A show that both improved waveforms of the output current and high efficiency can be obtained. The details of the control circuits and the driver circuits of the turn-off thyristors are also presented.
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Oguchi et al. (1981) studied this question.
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