Circuit arrangement for adjusting the operating voltage of high-pressure gas discharge lamps
US4891563A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 9, 1985 |
| Grant date | Jan 2, 1990 |
| Priority date | — |
| Expiry date | May 9, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B41/392
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A circuit arrangement for adjusting the operating voltage of high-pressure gas discharge lamps to a given nominal value, comprises a controllable current limiter connected in series with the lamp and an adjustment circuit (3) for controlling the latter. The output signal of the adjustment circuit is determined by the difference between a given desired value determining the nominal lamp operating voltage and an actual value dependent upon the instantaneous lamp operating voltage. In parallel with the lamp (1) a heating element (5) is arranged which is in thermal contact with a temperature-dependent electrical element (6), which produces the actual voltage dependent upon the instantaneous lamp operating voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.