Electric lamp and discharge devices: systems – Combined load device or load device temperature modifying... – Discharge device load
Reexamination Certificate
2000-11-09
2003-09-23
Wong, Don (Department: 2821)
Electric lamp and discharge devices: systems
Combined load device or load device temperature modifying...
Discharge device load
C362S265000
Reexamination Certificate
active
06624581
ABSTRACT:
This nonprovisional application claims priority under 35 U.S.C. §119(a) from German Patent Application No. 199 54 489.1 filed in Germany on Nov. 12, 1999, which is herein incorporated by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a circuit for operating an alternating current high pressure gas discharge lamp for a motor vehicle, having a ballast, a starter, a symmetrical lamp filter and a high pressure gas discharge lamp at least partially surrounded by a reflector, the symmetrical lamp filter being arranged between the high pressure gas discharge lamp and the starter circuit, having a filter capacitor arranged in parallel with the high pressure gas discharge lamp and a reactance coil in the connecting lines between this parallel circuit and the starter circuit, and having two lamp power supply lines at the input of the starter circuit.
2. Description of the Background Art
The high pressure gas discharge lamps usually used in motor vehicles, namely D
1
and D
2
lamps, have an asymmetrical design with regard to their power supply connections. The feedback line together with the reflector forms a capacitance of approx. 2 to 3 pF; the reflector forms an equally large capacitance with the vehicle. Interference pulses on the feedback line are thus fed as capacitance into the vehicle electric system by way of the vehicle chassis and are difficult to filter out in the starter.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to prevent interference pulses from being fed into the vehicle chassis and the vehicle electric system.
This object is achieved according to the invention by arranging a capacitor between the reflector and one of the lamp power supply lines.
Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
REFERENCES:
patent: 4467247 (1984-08-01), Hammer
patent: 5691577 (1997-11-01), Smith
patent: 5838109 (1998-11-01), Kobayashi et al.
patent: 6111359 (2000-08-01), Work et al.
patent: 910 (1952-08-01), None
patent: 4400412 (1994-07-01), None
patent: 4310307 (1994-10-01), None
patent: 19924097 (2000-11-01), None
Daub Wolfgang
Helle Hans-Michael
Moeller Stefan
A Minh D
Birch & Stewart Kolasch & Birch, LLP
Hella KG & Hueck Co.
Wong Don
LandOfFree
Circuit for driving an alternating current high pressure gas... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Circuit for driving an alternating current high pressure gas..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Circuit for driving an alternating current high pressure gas... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3101137