Power down brake latch circuit for a brushless DC motor

Details Power down brake latch circuit for a brushless DC motor Power down brake latch circuit for a brushless DC motor

1997-06-13

1999-12-21

Martin, David

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318376, 318375, 318459, 360 741, H02K 710

Patent

active

060053593

ABSTRACT:
A power down brake latch circuit for dynamically braking a spindle motor in a disk drive system is disclosed. The power down brake latch circuit includes a reservoir capacitor, a smoothing capacitor, a timing circuit, and a logic circuit. The timing circuit includes a voltage divider and a bandgap comparator. The smoothing capacitor absorbs a BEMF voltage from the spindle motor as it rotates after losing power. The timing circuit generates a first signal when a voltage on the smoothing capacitor falls below a threshold. The logic circuit brakes the spindle motor in response to the loss of power and the generation of the first signal.

REFERENCES:
patent: 3699416 (1972-10-01), Sloan et al.
patent: 4479080 (1984-10-01), Lambert
patent: 4658308 (1987-04-01), Sander, Jr.
patent: 5091680 (1992-02-01), Palm
patent: 5170105 (1992-12-01), Kumar
patent: 5172036 (1992-12-01), Cameron
patent: 5221881 (1993-06-01), Cameron
patent: 5249877 (1993-10-01), Cameron
patent: 5306988 (1994-04-01), Carobolante et al.
patent: 5317243 (1994-05-01), Cameron
patent: 5331261 (1994-07-01), Brown et al.
patent: 5377094 (1994-12-01), Williams et al.
patent: 5449993 (1995-09-01), Davis
patent: 5455496 (1995-10-01), Williams et al.

Affiliated with

Also associated with

Rating

Power down brake latch circuit for a brushless DC motor does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Power down brake latch circuit for a brushless DC motor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Power down brake latch circuit for a brushless DC motor will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-508342