Duty cycle detector

Details Duty cycle detector Duty cycle detector

1982-03-31

1984-10-02

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

328 61, 307234, 307265, 377 39, 377 45, H03K 526, H03K 505

Patent

active

044750862

ABSTRACT:
Apparatus is disclosed for determining whether the duty cycle of a periodic signal produced by an incremental encoder is within a predetermined acceptable range. The apparatus includes an oscillator which produces clock pulses at a substantially higher frequency than the periodic signal and a counter which is effective during a selected period of the periodic signal to add the number of clock pulses produced during that portion of the period when the square wave signal is high and subtract from the accumulated number, the number of clock pulses produced when the signal is low. A detector, in response to the final number held by the counter, determines whether the duty cycle is within the predetermined acceptable range.

REFERENCES:
patent: 3652832 (1972-03-01), Baumann
patent: 3941981 (1976-03-01), Abe
patent: 3956616 (1976-05-01), Knollenberg
patent: 3980960 (1976-09-01), Hutchinson
patent: 4277697 (1981-07-01), Hall
patent: 4314147 (1982-02-01), Miyagawa
patent: 4323976 (1982-04-01), Radaelli
patent: 4399412 (1983-08-01), Rinaldi

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