Method and device for controlling load and voltage in voice coils
US8786242B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 26, 2009 |
| Grant date | Jul 22, 2014 |
| Priority date | — |
| Expiry date | Dec 21, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P25/034
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method for sensing and compensating for variances in load and voltage in a closed loop voice coil system is described. A load in a system which included a supply voltage and the load, which includes an inductive element, is excited with a known duty cycle for a time interval. At an end time, at the end of the time interval, the current which flows through the load is sensed. A lumped term based at least in part on the time interval and a change in the load current during the time interval is calculated. The lumped term is representative of the supply voltage and one or more electrical characteristic of the load. A control signal to control a voltage applied to the load may be generated based at least in part on the lumped term. Apparatus and computer-readable media are also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.