H - Electricity – 05 – B
Patent
H - Electricity
05
B
315/54
H05B 41/14 (2006.01) H05B 41/282 (2006.01) H05B 41/392 (2006.01)
Patent
CA 1199961
ABSTRACT OF THE DISCLOSURE An electronic ballast system for at least one of a pair of gas discharge tubes, each of the gas discharge tubes having a first and second filament, the system comprising a first transformer having a primary and a secondary winding for establishing an oscilla- tion signal, first and second transistors being feedback coupled to the first transformer for switching a current signal responsive to the oscillation signal, first and second inverter transformers each of the inverters having a tapped winding for establishing an induced voltage signal responsive to the current signal, and a pair of secondary windings; first and second coupling capacitors connected to the tapped windings of the inverter transformers and the first filaments of the gas discharge tubes for discharging the induced voltage signal to the first filaments; and first and second capaci- tance tuning devices coupled to the tapped windings and secondary windings of the inverter transformers for modifying a resonant frequency and a duty factor of a signal pulse generated in the inver- ter transformers.
420071
Gowling Lafleur Henderson Llp
Intent Patent A.g.
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