Method and apparatus for providing the lock of a phase-locked lo

Details Method and apparatus for providing the lock of a phase-locked lo Method and apparatus for providing the lock of a phase-locked lo

1992-02-28

1993-06-29

Wysocki, Jonathan

Electricity: motive power systems

Switched reluctance motor commutation control

318138, 388911, H02P 700

Patent

active

052237729

ABSTRACT:
Synchronization of the output of an internally-driven VCO to an exterior clock signal is obtained by using the exterior clock signal to re-start the VCO at every exterior clock pulse, until the pre-set VCO frequency is reached. At that point, the restarting of the VCO ceases, and the VCO locks onto the internal signal it is designed to track. One application of this circuit is for enabling a smooth transition between open-loop, ramp-up of a polyphase DC motor to closed loop operation. Implementation of the circuit described phase-synchronizes the output of a phase-switching PLL loop, which is tracking the back emf of the motor, to the external clock used for motor ramp-up, so that there is no "jolt" in the motor at the transition from open-loop to closed-loop operation of the motor.

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patent: 5034668 (1991-07-01), Bausch

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