Circuit arrangement for operating a high-pressure sodium discharge lamp
US4952846A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 23, 1986 |
| Grant date | Aug 28, 1990 |
| Priority date | — |
| Expiry date | Jun 23, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B41/392
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A circuit arrangement for operating at a supply voltage V.sub.n a high-pressure sodium discharge lamp (4) having a lamp voltage V.sub.la in conjunction with a current limiter circuit (3) and a first controlled semiconductor switching element (1). The circuit arrangement comprises PA0 a first part of comparing a proportional part of the lamp voltage V.sub.la with a reference voltage V.sub.r and PA0 a second part for comparing a proportional part of the supply voltage V.sub.n with the resultant of the first comparison. The circuit arrangement makes it possible to operate the lamp so that the lamp voltage V.sub.la is substantially constant.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.