Direct digital technique for generating an AC waveform

Details Direct digital technique for generating an AC waveform Direct digital technique for generating an AC waveform

1976-08-10

1978-08-08

Dobeck, B.

Electricity: motive power systems

Positional servo systems

Pulse-width modulated power input to motor

307265, 363137, G05B 1128

Patent

active

041059395

ABSTRACT:
A digital circuit employing a programmable read only memory (PROM) provides direct digital driving of semiconductor devices comprising a bridge circuit of an inverter to develop a predetermined AC output waveform. The combination of the programmable read only memory and an up-down counter provides the capability of stopping the output waveform at predetermined points as well as reversing the phase direction of the AC output waveform to thereby permit greater control of an electrical system driven by the AC output waveform.

REFERENCES:
patent: 3614590 (1971-10-01), Kernick
patent: 3624486 (1971-11-01), Oates
patent: 3649902 (1972-03-01), Dunbar
patent: 3766497 (1973-10-01), Opal et al.
patent: 4028609 (1977-06-01), Detering

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