PULSE-WIDTH MODULATED INVERTER SYSTEM AND METHOD

摘要

070002-BWL PULSE-WIDTH MODULATED INVERTER SYSTEM AND METHOD : A pulse-width modulated inverter system and a method for operating the same is describecl for providing three-phase power to a load at a preselectable output frequency and a preselectable output voltage wherein modulated inverter logic control circuitry is provided for activating switching devices to produce waveforms at output terminals having at least one pulse of a variable width disposed symmetrically about the center or 90.degree. point in the middle 60.degree. portion in each half cycle thereof. The width of the pulses are varied continuously to obtain the preselected output voltage. The number of pulses to be added in the middle 60.degree. portion in each half cycle of the waveforms is increased automatically and continuously as the preselectable output frequency is reduced.