Discharge lamp

Details Discharge lamp Discharge lamp

H - Electricity

01

J

315/48

H01J 7/44 (2006.01) H01J 17/34 (2006.01) H01J 61/56 (2006.01) H05B 41/231 (2006.01)

Patent

CA 1102402

PHN 8522 17.7.1977 ABSTRACT : The invention relates to a dis- charge lamp intended for operation with alterna- ting current, wherein the lamp is provided with an internal capacitor. According to the invention the capacitor is a temperature-dependent capacitor which is either in series with the discharge tube or is included in a branch which is in parallel with that discharge tube. The result is that at the relatively low lamp temperature at the beginning of the starting procedure of that lamp the capacitance of the capacitor is relatively high and that in the operating condition of the lamp the capacitance of the capacitor is relatively low. In the case where the capacitor constitutes a ballast of the lamp (series arrangement) this results in an increased starting current of the discharge tube. In the case the capacitor shunts the discharge path a proper operation of the capacitor, which promotes starting, can be coupled to a situation in which the capacitor in the operating condition of the lamp is hardly of any influence any longer. -14-

286582

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