Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Periodic switch in the primary circuit of the supply...
Patent
1998-01-20
2000-01-25
Shingleton, Michael
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Periodic switch in the primary circuit of the supply...
315DIG2, 315DIG7, 315224, 315244, 315209R, H05B 3702
Patent
active
060182202
ABSTRACT:
A ballast circuit for a gas discharge lamp includes a rectifier coupled to convert current from an a.c. source to d.c. current provided on bus and reference conductors. A smoothing capacitance, coupled between the bus and reference conductors, smooths current supplied by the rectifier. A resonant load circuit includes a resonant inductance, a resonant capacitance, and means to connect to the lamp. A d.c.-to-a.c. converter circuit, coupled to the resonant load circuit, induces an a.c. current in the resonant load circuit. The converter circuit comprises first and second switches serially connected between the bus and reference conductors, and being connected together at a common node through which the a.c. load current flows. The switches each comprise a reference node and a control node, the voltage between such nodes determining the conduction state of the associated switch. The respective reference nodes of the switches are interconnected at the common node. The respective control nodes of the switches are interconnected. A control circuit for controlling the switches includes an inductance connected between the control nodes and the common node. A starting pulse-supplying capacitance is connected in series with the inductance, between the control nodes and the common node. A network is connected to the control and common nodes for supplying the starting pulse-supplying capacitance with charge so as to create a starting pulse thereacross during lamp starting effective on its own to start one of the switches. The capacitance substantially comprises at least one dry-type capacitor.
REFERENCES:
patent: 4370600 (1983-01-01), Zansky
patent: 4463286 (1984-07-01), Justice
patent: 4546290 (1985-10-01), Kerekes
patent: 4588925 (1986-05-01), Fahnrich et al.
patent: 4614897 (1986-09-01), Kumbatovic
patent: 4647817 (1987-03-01), Fahnrich et al.
patent: 4667345 (1987-05-01), Nilssen
patent: 4692667 (1987-09-01), Nilssen
patent: 4734828 (1988-03-01), Vargo
patent: 4937470 (1990-06-01), Zeller
patent: 4945278 (1990-07-01), Chern
patent: 5223767 (1993-06-01), Kulka
patent: 5309062 (1994-05-01), Perkins et al.
patent: 5341068 (1994-08-01), Nerone
patent: 5349270 (1994-09-01), Roll et al.
patent: 5355055 (1994-10-01), Tary
patent: 5387847 (1995-02-01), Wood
patent: 5406177 (1995-04-01), Nerone
patent: 5446347 (1995-08-01), Nilssen
patent: 5514981 (1996-05-01), Tam et al.
(Anonymous), "Samsung Electronics KA7514A Industrial," Samsung Electronics, Korea (1996), CD-ROM (Edition 3.0), printed as pp. 1-5.
General Electric Company
Shingleton Michael
LandOfFree
Gas discharge lamp ballast circuit with a non-electrolytic smoot does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Gas discharge lamp ballast circuit with a non-electrolytic smoot, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Gas discharge lamp ballast circuit with a non-electrolytic smoot will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2318054