Electric lamp and discharge devices: systems – With signal – indicator – or alarm
Patent
1993-12-15
1995-02-28
Pascal, Robert J.
Electric lamp and discharge devices: systems
With signal, indicator, or alarm
315209R, 315224, 315219, 315DIG5, H01J 160
Patent
active
053940628
ABSTRACT:
A gas discharge lamp ballast with an indicator of operability of the ballast is disclosed. The ballast circuit comprises circuitry for providing a d.c. bus voltage on a bus conductor with respect to a ground, and a resonant load circuit. The resonant load circuit includes lamp terminals for connecting to a removable gas discharge lamp, a resonant inductor, and a resonant capacitor. The resonant inductor and resonant capacitor are selected to set a magnitude, and resonant frequency, of a bidirectional current in the lamp. Further included is a converter circuitry, including first and second serially connected switches coupled between the bus conductor and the ground, and providing to the resonant load circuit, at a node coupled between the first and second switches, a voltage that alternates between first and second voltage levels. Circuitry for generating first and second switch-control signals for alternately switching into conduction the first and second switches, including circuitry responsive to a feedback signal representing a current in the resonant load circuit, are further included. The ballast circuit, moreover, includes overload detection circuitry for detecting if voltage applied to the lamp terminals exceeds an overload level; and circuitry for indicating, in response to such an overload condition being detected by the overload detection circuitry, probable operability of the ballast circuit.
REFERENCES:
patent: 3293489 (1966-12-01), Marshall
patent: 5047690 (1991-09-01), Nilsson
patent: 5134345 (1992-07-01), El-Hamainsy et al.
patent: 5208515 (1993-05-01), Lee
patent: 5233273 (1993-08-01), Waki et al.
U.S. patent application Ser. No. 08/020,275, date filed: Feb. 18, 1993.
Harsa Clarence J.
Minarczyk Michael M.
Nerone Louis R.
Oberle Joseph C.
Ronald Brian M.
Corwin Stanley C.
General Electric Company
Hawranko George E.
Pascal Robert J.
Philogene Haissa
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