Voltage-mode drive for driving complex impedance loads
US6940685B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 16, 2003 |
| Grant date | Sep 6, 2005 |
| Priority date | — |
| Expiry date | Oct 14, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P25/034
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method of driving an electrical load having a complex electrical impedance, such as a voice-coil motor controlling the position of a read/write head in a data storage disk drive system, comprises providing a voltage-mode driver generating drive signals for the electrical load in response to drive commands. Compensated commands for the voltage-mode driver are generated filtering the drive commands, compensating for a phase shift between electrical quantities delivered to the electrical load. The voltage-mode drive thus emulates a conventional, but more expensive, current-mode drive. In a preferred embodiment, the method comprises estimating characteristic parameters of the electrical load during the operation, and adapting the filtering to the estimated characteristic parameters. The estimation comprises implementing a Kalman filtering algorithm, particularly an extended Kalman filtering.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.