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US 7,541,753 B2Granted
Starter for low-pressure discharge lamps
AssigneeOsram Gesellschaft Mit Beschraenkter Haftung
InventorsStefano Florian, Axel Girstenbreu
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AssigneeOsram Gesellschaft Mit Beschraenkter Haftung
InventorsStefano Florian, Axel Girstenbreu
Estimating the term…
Disclosed is a starter for AC-fed low-pressure discharge lamps that are operated on a series inductor. The starter comprises a glow fuse, a high-temperature conductor (NTC resistor) that is serially connected to the glow fuse, and a resetting bimetal switch which is serially connected to the glow fuse and the high-temperature conductor and is in thermal contact therewith. The high-temperature conductor is provided with high resistance in a cold state, which is transformed into low resistance by elements of built-up heat while the bimetal switch interrupts the electrode heating circuit when the low-pressure discharge lamp fails to ignite. According to the invention, the current is conducted via the high-temperature conductor for both igniting the low-pressure discharge lamp and switching off when the discharge lamp fails to ignite.
A starter for AC fed low pressure discharge lamps operated on a series inductor, having a glow igniter, an NTC thermistor that is connected in series with the glow igniter, and a resettable bimetallic switch that is connected in series with the glow igniter and the NTC thermistor and is in thermal contact therewith, the NTC thermistor having in a cold state a high ohmic resistance that is transformed into a low ohmic resistance by intrinsic heating, and the bimetallic switch interrupts the electrode heating circuit upon nonignition of the low pressure discharge lamp, characterized in that the current is conducted via the NTC thermistor both for igniting the low pressure discharge lamp and for switching off upon nonignition.
Dependencies are inferred from the claim text.