H - Electricity – 05 – B
Patent
H - Electricity
05
B
315/59
H05B 41/18 (2006.01) H05B 41/04 (2006.01)
Patent
CA 1071297
ABSTRACT The invention relates to a device for starting a discharge lamp by means of a transistor starter, that starter being provided with an auxiliary transistor for stop- ping the starting procedure if the lamp fails to ignite. According to the invention a zener diode is included in the control circuit of the auxiliary transistor, while further- more a capacitor is connected in parallel across the lamp, and a self-inductor is included in the connection from the lamp to the main transistor. In a circuit according to the invention, the auxiliary transistor has yet a second func- tion, namely because, by the action of the zener diode, the instants the main transistor is made conductive by means of the auxiliary transistor are delayed, so that a large rise of the voltage between the electrodes of the lamp is produced which is useful for a reliable ignition of the lamp within a large temperature range.
245545
Chermin Hubertus M.j.
Luursema Meerten
Rozenboom Jaap
Smulders Herman A.g.s.
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