Ballastless discharge lamp operating circuit

Details Ballastless discharge lamp operating circuit Ballastless discharge lamp operating circuit

H - Electricity

05

B

315/51

H05B 41/14 (2006.01) H05B 41/04 (2006.01)

Patent

CA 1078451

ABSTRACT: The invention relates to a device for operating a low-pressure sodium vapour discharge lamp without a ballast. According to the invention the electrode voltage drop near a main electrode of the sodium lamp is influenced by a change in the pre-heating current of that electrode and/or a change in the effective area of the electrode. The changed electrode voltage drop obtained in this way results in that any changes in the lamp current are opposed, which enables a simple ballast-less operation of the lamp. -14-

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