Spindle motor controlling circuit of an optical disk system

Electricity: motive power systems – Positional servo systems – Frequency- or phase-modulated systems

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318632, 388805, G05B 106

Patent

active

055571840

ABSTRACT:
A spindle motor controlling circuit for controlling the rotation of an optical disk system using a constant linear velocity servo. The circuit includes a spindle motor rotation sensing circuit for generating a phase frequency in response to the rotation of the spindle motor. A speed control part of the controlling circuit includes a speed error signal generating circuit that generates speed error data indicative of a difference between the period of the phase frequency and data representing a desired spindle motor speed. A phase control part of the control circuit includes a phase coefficient pulse generating circuit, a reference phase signal generating circuit and a phase error signal generating circuit. Finally, the controlling circuit includes a driving voltage generating circuit for generating a speed driving voltage corresponding to the speed error data and a phase driving voltage corresponding to the phase error signal. The driving voltages are used for driving the spindle motor.

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