Waveform synthesis using switching circuits

Details Waveform synthesis using switching circuits Waveform synthesis using switching circuits

1974-09-03

1976-03-30

Shoop, William M.

Electricity: motive power systems

Motor-reversing

Armature or primary circuit control

318230, 318231, 321 9A, H02K 1702

Patent

active

039477363

ABSTRACT:
The synthesising of a waveform which upon integration will approximate a sinusoid of controllable frequency and amplitude is disclosed. Any desired amplitude may be programmed for a particular frequency. The synthesiser is suitable as a variable speed AC motor drive. The output waveform is synthesised by chopping a square wave using a variable width chop. To obtain lower harmonic content, a chopped square wave is Walsh multiplied with another square wave of different frequency to produce a pulse width modulated waveform having a frequency equal to the frequency difference between the square waves. Methods for accurately controlling the difference frequency using variable digital dividers are disclosed.

REFERENCES:
patent: 3409817 (1968-11-01), Gillett
patent: 3423662 (1969-01-01), Schlabach et al.
patent: 3538420 (1970-11-01), Klein
patent: 3662247 (1972-05-01), Schieman
patent: 3739253 (1973-06-01), Humphrey et al.

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