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A simple multiple pulsewidth modulated (MPWM) ac chopper using power transistors for 3-β power control is discussed. 120° chopping period is used for main transistors so that the circuit can accommodate resistive and lagging or leading power factor loads. Only 1-β sensing is used for 3-β control. An alternate economical power and control schemes for 3-β MPWM ac choppers suitable only for resistive loads is also suggested. The experimental results for 12 choppings per cycle are given.
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Bhat et al. (1982) studied this question.
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