Pulse-width modulated inverter system and method

Details Pulse-width modulated inverter system and method Pulse-width modulated inverter system and method

1979-03-30

1981-09-22

Shoop, William M.

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

H02M 112

Patent

active

042913683

ABSTRACT:
A pulse-width modulated inverter system and a method for operating the same is described 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.

REFERENCES:
patent: 3611086 (1971-10-01), Mokrytzki
patent: 3958171 (1976-05-01), Sekino

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