Phase-locked loop speed control system using programmable...

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

H - Electricity

02

P

318/108

H02P 7/28 (2006.01)

Patent

CA 1128987

ABSTRACT OF THE DISCLOSURE 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 program- mable 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.

330725

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