Electric lamp and discharge devices: systems – Pulsating or a.c. supply – Induction-type discharge device load
Patent
1995-09-21
1997-04-15
Pascal, Robert
Electric lamp and discharge devices: systems
Pulsating or a.c. supply
Induction-type discharge device load
315278, 315224, 336224, H05B 4116
Patent
active
056212801
ABSTRACT:
An illumination unit comprises an electrodeless low-pressure discharge-lamp and a high-frequency power supply unit. The lamp has a gastight closed discharge vessel with an ionizable fill and a coil with turns of a primary and a secondary winding around a core of soft-magnetic material. The power supply unit has input terminals, a first output terminal, electrically neutral with respect to ground, that is connected to a first end of the primary winding, and a further output terminal that is connected to a second end of the primary winding. During nominal lamp operation the primary winding excites a high-frequency magnetic field that maintains an electrical discharge in the discharge vessel and that induces in the secondary winding a potential drop in the direction of a first, with respect to the electrically neutral end, to a second free end that varies in a sense opposite to the potential drop from the first to the second end in the first winding. At least one of the windings has at its second end at least one turn that extends beyond the core, which facilitates the ignition of the lamp.
REFERENCES:
patent: 3748510 (1973-07-01), McNeal
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patent: 4704562 (1987-11-01), Postma et al.
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patent: 5061896 (1991-10-01), Schmidt
patent: 5291091 (1994-03-01), Eggink
patent: 5465028 (1995-11-01), Antonis et al.
Antonis Petrus H.
Konings Leonardus U. E.
Schlejen Jacob
Egbert, III Walter M.
Franzblau Bernard
Gambino Darius
Pascal Robert
U.S. Philips Corporation
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