Operating circuit and operating method for a gas discharge lamp
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United States of America Patent
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Issued Date -
May 19, 2005
app pub date -
Nov 12, 2004
filing date -
Nov 15, 2003
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
In an operating circuit for a gas discharge lamp 1, in particular in the aeronautical field, an inductance L1 is connected upstream of the gas discharge lamp 1 and a switch V3 periodically controlled by an electronic control system 3 controls the current through the inductance L1. In order also to be able to achieve very low dimming values with freedom from flicker, by virtue of the switch V3 being switched into a conducting condition by means of the electronic control system 3 a constant dc voltage U.sub.in is applied to the inductance L1 for a constant switch-on duration t.sub.on. By the switch V3 being switched off at the end of the switch-on duration t.sub.on the energy stored by the inductance L1 is discharged to the gas discharge lamp 1. In each case after discharge of the inductance L1 the electronic control system 3 closes the switch V3 periodically again for the switch-on duration t.sub.on.
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