Circuit for driving an alternating current high pressure gas discharge lamp for a motor vehicle
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United States of America Patent
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Sep 23, 2003
Grant Date -
N/A
app pub date -
Nov 9, 2000
filing date -
Nov 12, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A circuit for operating an alternating current high pressure gas discharge lamp for a motor vehicle is described. The circuit includes a ballast, a superimposed pulse starter, a symmetrical lamp filter and a high pressure gas discharge lamp which is surrounded at least partially by a reflector, the symmetrical lamp filter being arranged between the high pressure gas discharge lamp and the superimposed pulse starter, with a filter capacitor arranged in parallel with the high pressure gas discharge lamp and with one reactance coil arranged in each of the connecting lines between this parallel circuit and the starter circuit, and with two lamp power supply lines at the input of the starter circuit, a capacitor being arranged between the reflector and at least one of the lamp power supply lines. This causes the interference emitted by the high pressure gas discharge lamp to be diverted into the starter, thus preventing the interference pulses from being applied to the vehicle ground and thus to the vehicle electric system.
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