Disk drive comprising a pulse width modulated demand limit circuit for enhancing power management during spin-down
US6970319B1 · kind B1 · utility
125Cited by
7References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 27, 2003 |
| Grant date | Nov 29, 2005 |
| Priority date | — |
| Expiry date | Oct 11, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/54
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A disk drive is disclosed comprising a head, a disk and a spindle motor for rotating the disk. An internal supply voltage is generated from a back EMF (BEMF) voltage across the windings of the spindle motor. The internal supply voltage is applied to a voice coil motor for use in parking the head during a spin-down mode. The internal supply voltage is compared to a threshold in order to activate a demand limit control signal. A periodic signal periodically disconnects the internal supply voltage from the VCM while the demand limit control signal is active.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.