Apparatus and method for providing selective hysteresis for zero

Details Apparatus and method for providing selective hysteresis for zero Apparatus and method for providing selective hysteresis for zero

1995-10-10

1997-11-25

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

360 9701, 360 7301, G11B 1546

Patent

active

056918569

ABSTRACT:
A hysteresis circuit for providing hysteresis for a degree of noise immunity when detecting zero-crossings of a hard disk drive. A comparator is used to detect the zero-crossings associated with one of the windings of the disk drive's spindle motor. When a zero-crossing is detected, the hysteresis circuit introduces a hysteresis voltage to one of the inputs to the comparator. A positive hysteresis voltage is applied when the slope of the back emf signal corresponding to the motor winding is negative. Conversely, a negative hysteresis voltage is applied when the back emf signal has a positive slope. The slope of the back emf signal is determined by a logic combination of the commutation signals used to commutate the spindle motor.

REFERENCES:
patent: 4743815 (1988-05-01), Gee et al.
patent: 4864198 (1989-09-01), Takase et al.
patent: 4922169 (1990-05-01), Freeman
patent: 5210474 (1993-05-01), Oswald
patent: 5367234 (1994-11-01), DiTucci
patent: 5397971 (1995-03-01), McAllister et al.
patent: 5442266 (1995-08-01), Morehouse et al.
patent: 5493189 (1996-02-01), Ling et al.
patent: 5541484 (1996-07-01), DiTucci
U.S. application No. 08/094,484, Galvin et al., filed Jul. 19, 1993.

Affiliated with

Also associated with

Rating

Apparatus and method for providing selective hysteresis for zero does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Apparatus and method for providing selective hysteresis for zero, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and method for providing selective hysteresis for zero will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2111927