Apparatus for controlling the duty cycle of a pulse generator

Details Apparatus for controlling the duty cycle of a pulse generator Apparatus for controlling the duty cycle of a pulse generator

1994-05-24

1996-03-26

O'Shea, Sandra L.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

324173, 32420725, 327175, G01P 348, G01P, G01P

Patent

active

055023762

ABSTRACT:
Apparatus is presented for controlling the duty cycle of a pulse generator which provides a periodic input signal having a frequency proportional to the rate of movement of an input member. The input signal is compared with a threshold signal and, for each cycle of the periodic signal, an ON signal is provided so long as the magnitude of the input signal exceeds that of the threshold signal. The apparatus for controlling the duty cycle includes a clock source for providing clock pulses having a fixed frequency rate. A first counter counts the total number of clock pulses occurring during an interval corresponding with N of the ON pulses to provide a total count of B. A second counter counts the total number of clock pulses occurring during each of the N ON pulses and provide a total count of A. The ratio of A to B is calculated to provide a ratio R. A new value is calculated for the threshold signal for replacing the previous value of the threshold signal wherein the new value varies as a function of the value of the ratio R.

REFERENCES:
patent: 4257005 (1981-03-01), Hall
patent: 4434470 (1984-02-01), Thomas et al.
patent: 4485452 (1984-11-01), Cording et al.
patent: 4884227 (1989-11-01), Watanabe
patent: 4902970 (1990-02-01), Suquet

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