DEVICE AND METHOD FOR GENERATING THREE-PHASE SINE WAVES USING TWO PULSE-WIDTH MODULATORS

摘要

A device and method for providing three-phase pulse-width modulated sine waves includes an inverter including first, second and third legs, and first and second PWM generators, the first PWM generator is coupled to selectively provide an output to the first inverter leg or the third inverter leg, and the second PWM generator is coupled to selectively provide an output to the second inverter leg or the third inverter leg. In exemplary embodiments of the invention, the first PWM generator provides an output to the first inverter leg during first and second 120° segments of a 360° electrical cycle, and the first PWM generator provides an output to the third inverter leg during a third 120° segment. The second PWM generator provides an output to the third inverter leg during the first 120° segment, and the second PWM generator provides an output to the second inverter leg during the second and third 120° segments, thus providing generation of three-phase pulse-width modulated sine waves using fewer than three pulse-width modulators.