H - Electricity – 05 – B
Patent
H - Electricity
05
B
315/59
H05B 41/18 (2006.01) H05B 41/36 (2006.01) H05B 41/392 (2006.01)
Patent
CA 1038025
ABSTRACT OF THE DISCLOSURE There is provided a circuit for solid-state starting and ballasting gaseous discharge lamps operating on direct current. The circuit provides a means of positive turn off and turn on of gaseous discharge lamps. A direct current source is connected in series with a strating pulse trans- former, a gaseous discharge lamp and a constant current ballast transistor. A resistor is connected across the lamp to shunt the ballast transistor off-state leakage current away from the lamp and a second transistor is connected to the base of the ballast transistor to provide a shunt path for the off-state leakage current away from the base-emitter junction of the ballast transistor. The starting circuit for the lamp, which comprises an SCR connected in series with a pulse transformer primary winding and a capacitor, is separated from the transistor ballast. A charging resistor is connected between the direct current source and the starting means, the value being large enough to conduct current below the holding current of the SCR so that it will commutate when gate drive is removed. The gate terminal of the SCR and the base of the ballast transistor are connected to a common control signal input. A second capacitor is connected to the direct current source and to the collector of the ballast transistor to bypass starting voltage spikes from the ballast transistor and to aid in starting the lamp.
183959
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