Phase-locked loop speed control system using programmable counte

Details Phase-locked loop speed control system using programmable counte Phase-locked loop speed control system using programmable counte

1979-05-31

1981-07-14

Smith, Jr., David

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318318, 331 1A, H02P 516

Patent

active

042789257

ABSTRACT:
A phase-locked loop system for controlling the speed of a motor or the like comprises an oscillator generating clock pulses or the like comprises a programmable frequency divider receptive of clock pulses for delivery of output pulses at a frequency which is an integral submultiple of the clock frequency, the integral submultiple being variable as a function of external supplied digital signals. A phase comparator compares speed related pulses. A transducer generates pulses at a repetition frequency related to the speed of the motor which is compared in the phase comparator with the output pulse from the frequency divider for driving the motor. A programmable binary counter is provided which is reset in response to the beginning of each period of the speed related pulses for counting the clock pulse. A logic gate circuit is connected to the counter stages of the programmable counter to define a range of pulse counts to generate motor control voltage signals when the count falls outside of the defined range.

REFERENCES:
patent: 3458823 (1969-07-01), Nordahl
patent: 3686469 (1972-08-01), Clark et al.
patent: 3836756 (1974-09-01), Yammoto et al.
patent: 3936710 (1976-02-01), Tanikoshi
patent: 4151485 (1979-04-01), Lafratta

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