Compander for power control in a ballast
US6577262B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 22, 1999 |
| Grant date | Jun 10, 2003 |
| Priority date | — |
| Expiry date | Dec 22, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/1235
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A system and method for the dynamic power control of a ballast, wherein a compander is used to reduce dynamic input range requirements of an analog-to-digital converter (ADC) in power systems having dynamic signal ranges that are several orders of magnitude smaller than the largest signal being sampled. The present invention compresses an analog power signal and then digitizes and expands the signal to attain a digitized signal having an amplitude identical to the analog signal, thereby providing a power control system that is less expensive and less complicated than conventional power systems. The present invention can use algorithms to calculate both the expansion values and correction values required for a power control circuit to adjust an output power level toward a desired value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.