Pulse-width modulation waveform generator

Details Pulse-width modulation waveform generator Pulse-width modulation waveform generator

1990-07-03

1992-03-03

Callahan, Timothy P.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307234, 328 58, 377 55, H03K 3017, H03K 504

Patent

active

050935828

ABSTRACT:
A PWM waveform generator has a cycle timer for generating pulses at regular intervals, and a duty timer for generating a pulse of a program-selected duration after each pulse from the cycle timer. A register stores one bit of data which designates whether the PWM output starts high or low at the beginning of each cycle. The pulses from the cycle timer are fed through gates controlled by the register contents to the set and reset terminals of a flip-flop. Pulses from the duty timer cause the flip-flop to toggle. The starting level can be changed in any PWM cycle by rewriting the data in the register.

REFERENCES:
patent: 3805167 (1974-04-01), Nash et al.
patent: 3840815 (1974-10-01), Masters
patent: 3980960 (1976-09-01), Hutchinson
patent: 4330751 (1982-05-01), Swain
patent: 4979194 (1990-12-01), Kawano
Electronics; "One-Shot Multivibrator Has Programmed Pulse Width"; Stephen C. Armfield; Jul. 7, 1977; pp. 104-105.

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