Abstract
Three-phase balanced sine-PWM pulses are required for the purpose of generation of sinusoidal output voltage and/or currents from inverters, used for UPS/motor-control applications. Such pulse-generation is possible using micro-controllers/DSPs with PWM output pins. This paper discusses a simple algorithm to generate low distortion balanced three-phase sine-PWM pulses from a general purpose micro-controller, without using PWM pins. It is shown via simulation and experimentation that such an algorithm is capable of achieving current-distortions well below 5%. An inverter, controlled by such an algorithm, is also tested for three-phase AC induction motor control application in V/f mode, using a feed-forward control-methodology. A performance-comparison is made between a general-purpose micro-controller (using the above strategy) and a micro-controller (used for motor-control applications) for the above application-area.
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