H - Electricity – 05 – B
Patent
H - Electricity
05
B
315/58
H05B 41/16 (2006.01) H05B 41/04 (2006.01)
Patent
CA 1141426
48,914 ABSTRACT OF THE DISCLOSURE A lighting apparatus which provides for high- voltage pulses for starting a high-pressure sodium dis- charge lamp and thereafter provides operating ballasting. The apparatus uses two capacitors and associated blocking diodes and a charging resistor. One of the capacitors charges toward the peak of the line voltage in the nega- tive half cycle, and thereafter, when the line voltage goes positive, the voltage on the one capacitor is added to the line voltage for charging the other capacitor. When the voltage on the other capacitor reaches a pre- determined voltage exceeding the Zener voltage of a paral- leling Zener diode which Zener voltage may be about twice the peak voltage of the line, the other capacitor dis- charges through a ballast inductor which is connected in autotransformer relationship therewith to provide a high voltage pulse of sufficient magnitude to start the lamp.
382409
Mcconnell And Fox
Westinghouse Electric Corporation
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