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DC start for metal halide lamps

IP.com Disclosure Number: IPCOM000019606D
Publication Date: 2003-Sep-23
Document File: 1 page(s) / 11K

Publishing Venue

The IP.com Prior Art Database

Abstract

ID609630

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ID609630

DC start for metal halide lamps

    A metal halide lamp is often operated by means of a ballast circuit such as shown in the figure comprising a bridge circuit. During the ignition of the metal halide lamp, a large voltage must be present over the lamp. Such a large voltage can be generated by controlling the DC switch and the switch T1 both in a conductive state (while switch T2 is maintained in a non-conductive state). As a consequence the rail voltage (in the example in the figure equal to 400 Volts) is present over the series arrangement comprising the lamp. A moderate rail voltage thus suffices to ignite the lamp.

Disclosed anonymously.

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