System and process for utilizing back electromotive force in disk drives
US7211973B1 · kind B1 · utility
4Cited by
18References
41Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 13, 2005 |
| Grant date | May 1, 2007 |
| Priority date | — |
| Expiry date | Jul 13, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B21/12
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A circuit system and process utilizes back electromotive force (BEMF) voltage to assist in safe power down of devices, such as the read/write head in from low factor disk drives or similar devices. The BEMF voltage from a motor device, such as a spindle motor utilized in a circuit using negative voltage to drive some switches, such as positive channel metal oxide semiconductor (“PMOS”) driver transistors, to reduce and/or effectively minimize the on-resistance of the switches while delivering the current from BEMF voltage of the motor to another device, such as a motor that retracts controls a read/write head.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.