Electric lamp and discharge devices: systems – With cathode or cathode heater supply circuit – Pulsating or a.c. supply to the cathode or heater circuit
Patent
1997-07-11
1998-08-04
Lee, Benny T.
Electric lamp and discharge devices: systems
With cathode or cathode heater supply circuit
Pulsating or a.c. supply to the cathode or heater circuit
315209R, 315DIG5, H05B 3700
Patent
active
057898669
ABSTRACT:
An electronic ballast includes a series resonant inductor and capacitor and a filament winding magnetically coupled to said inductor. The filament winding forms a closed circuit with a filament in a gas discharge lamp, wherein the current induced in the winding opposes a portion of the current through the inductor to reduce the net voltage on the filament during normal lamp operation. In accordance with another aspect of the invention, the filament winding is reversely wound with the inductor on a common core to reverse the phase of the current induced in the filament winding from the current through the inductor.
REFERENCES:
patent: 4158792 (1979-06-01), Kuroi et al.
Keegan Patrick J.
Keith William L.
Rhodes Bruce R.
Energy Savings, Inc.
Lee Benny T.
Vu David H.
Wille Paul F.
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