Abstract
Ac voltage controllers are used to obtain variable output voltage from fixed ac voltage. It has its applications in domestic and industrial heating, starting and speed control of single phase, three phase ac drives. In convention, Phase angle control and Integral cycle control have been extensively used in this type of controllers. These techniques have some inherent disadvantages like low power factor with respect to the firing angle and also the presence of lower order harmonic contents. This paper explores the techniques, which improves the power factor and reduces the harmonics. Also it compares and contrasts the implementation of extinction angle control (EAC) and Sinusoidal pulse width modulation control (SPWM), Moreover the performance evaluation of these proposed techniques has been analyzed while supplying for static loads. Thus the difficulty caused by the conventional techniques in the ac voltage controllers to obtain variable ac voltage can be reduced to an appreciable extent using the proposed scheme.
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