Switching waveform synthesiser for polyphase static inverters

Details Switching waveform synthesiser for polyphase static inverters Switching waveform synthesiser for polyphase static inverters

1979-09-05

1982-01-19

Beha, Jr., William H.

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

318811, H02M 108, H02P 1318

Patent

active

043120300

ABSTRACT:
Switching waveform generator for pulse width modulation triggering of static inverters producing variable frequency output. The number of chops per half-cycle of output fundamental frequency is decreased as fundamental frequency is increased so as to keep the switching frequency of the inverter within the capabilities of the power switching devices used while obtaining maximum harmonic suppression. The chop number is changed between sequential frequency ranges. In a preferred form the chop width is continuously varied as output frequency is varied to decrease output amplitude with decreasing frequency to enable constant torque operation of an induction motor load.

REFERENCES:
patent: 3538420 (1970-11-01), Klein
patent: 3694718 (1972-09-01), Graf et al.
patent: 3697843 (1972-10-01), Riess
patent: 3947736 (1976-03-01), Byers
patent: 3967173 (1976-06-01), Stich
patent: 3971972 (1976-07-01), Stich
patent: 4123692 (1978-10-01), Gilmore et al.

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