Power control of an AC-operated high-pressure gas discharge lamp, particularly for motor vehicles
US5945787A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 6, 1997 |
| Grant date | Aug 31, 1999 |
| Priority date | — |
| Expiry date | Nov 6, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S315/07
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A power control of an AC-operated, high-pressure gas discharge lamp, particularly in a motor vehicle, including a bridge circuit in which two controlled switching transistors are disposed in at least one branch, and in which the high-pressure gas discharge lamp is supplied with ignition and/or burning energy by way of the bridge branch provides that the switching transistors switch the current in the form of pulse packets, with the individual pulse packets respectively containing a certain number of high-frequency pulses; switching is effected with as little loss as possible in the zero crossings of the current; and regulation for maintaining a certain power of the high-pressure gas discharge lamp is effected through continuous averaging over a predetermined interval (44, 45) of the supplied power packets.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.