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Increase of integrated Halogen lifetime in worst-case conditions Disclosure Number: IPCOM000083331D
Publication Date: 2005-Mar-01
Document File: 2 page(s) / 92K

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The Prior Art Database



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Publication of ID869795

Increase of integrated Halogen lifetime in worst-case conditions

At this moment, the integrated Halogen has a lifetime of 5000 to 6000 hours in nominal condition. In worst-case condition, the lifetime reduces, due to the increase of output voltage, to 2000 to 3000 hours. More in detail, the output voltage in nominal situation (235 Volt mains or 120 Volt mains), the output voltage is around 11.7 Volt. In worst-case (254 Volt or 132/140 Volt) the output voltage increases to 12.2 or even 12.7 Volt (140 Volt mains). This affects the lifetime of the integrated Halogen substantial. Although the focus is on integrated Halogen, the idea is also valid for halogen applications with a non-integrated electronic driver.

As previous written, in worst-case condition, the lifetime reduces substantially.

By limiting the output voltage of the electronic driver to the nominal voltage, the lifetime of the halogen burner can be equal in worst-case and nominal condition. The losses in the circuit will go up, however since there is not efficiency required in any other condition as nominal, it will not affect the position of the lamp in specification.

The general schematic of the output stage of a halogen converter or electronic transformer is depicted below.

With this output stage, the output voltage increases when the mains voltage increases.

By adding two zener diodes and a current limiting resistor, the output voltage can be limited to a fixed voltag...