U.S. Philips Corporation

Heinz B Merker

Wolf-Dieter Bauch

Heinz Helmus

The electric lamp (1) has a lamp vessel (2), wherein an electric element (3) is accommodated. This element is connected to current conductors (4). Molybdenum end portions (5) of the current conductors extend outside the lamp vessel and have a skin of molybdenum nitride as a protection against oxidation.

Electric lamp having a protective skin on end portions of the current

A circuit arrangement for generating a pulsatory supply voltage for a load (1), such as a halogen incandescent lamp, from a source of direct voltage, in which a predetermined effective value of the supply voltage remains substantially constant in the case of a varying direct voltage. A switch (2) supplies the supply voltage from which a low-pass filter generates a mean value voltage. The mean value voltage is applied to a Schmitt trigger circuit (3) which controls the switch whose first switching threshold is constant and is derived from a reference voltage which is present at a first input of the Schmitt trigger circuit. A second switching threshold of the switch varies oppositely with respect to a decreasing direct voltage.

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Julich, Germany

Heinz B Merker