Method and apparatus for automatically controlling a lighting load
US6057654A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | May 13, 1999 |
| Grant date | May 2, 2000 |
| Priority date | — |
| Expiry date | May 13, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/40
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a method of automatically controlling a lighting load to which are delivered alternately forced turning on instructions and forced turning off instructions, according to the result of comparing the brightness measured in a given area and particular brightness thresholds, the brightness threshold used to deliver a forced turning on instruction, hereinafter called the comfort threshold, is left for the user to determine. In a normal operation phase, i.e. after an initiation phase, the brightness threshold used for delivering a forced turning off instruction is the sum of this comfort threshold and the brightness difference between the brightness measured before the previous forced turning off instruction and the brightness measured immediately after that forced turning off instruction. Applications include automatic control of fluorescent tubes with a non-electronic ballast.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.