Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Silicon controlled rectifier ignition
Patent
1997-09-02
1999-06-22
Shingleton, Michael
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Silicon controlled rectifier ignition
315247, 315224, 315307, 363 60, H05B 3702
Patent
active
059145706
ABSTRACT:
A gas discharge lamp ballast comprises a load circuit including circuitry for connection to a gas discharge lamp. A circuit supplies d.c. power from an a.c. voltage. A d.c.-to-a.c. converter circuit is coupled to the load circuit for inducing a.c. current therein. The converter circuit comprises first and second converter switches serially connected in the foregoing order between a bus node at a d.c. voltage and a reference node, and being connected together at a common node through which the a.c. load current flows. The first and second converter switches each have a control node and a reference node, the voltage between such nodes determining the conduction state of the associated switch. The respective control nodes of the first and second converter switches are interconnected. The respective reference nodes of the first and second converter switches are connected together at the common node. A boost converter comprises a boost capacitor connected between the bus and reference nodes and whose level of charge determines the bus voltage on the bus conductor. A boost inductor stores energy from the circuit that supplies d.c. power, the boost inductor being connected by at least one diode to the boost capacitor, for discharging its energy into the boost capacitor. A boost switch periodically connects the boost inductor through a low impedance path to the bus node to thereby charge the boost inductor. The boost switch comprises the first switch of the converter circuit. The ballast achieves a high degree of power factor correction.
REFERENCES:
patent: 4463286 (1984-07-01), Justice
patent: 4546290 (1985-10-01), Kerekes
patent: 4588925 (1986-05-01), Fahnrich et al.
patent: 4647817 (1987-03-01), Fahnrich et al.
patent: 4677345 (1987-06-01), Nilssen
patent: 4692667 (1987-09-01), Nilssen
patent: 4937470 (1990-06-01), Zeller
patent: 4939427 (1990-07-01), Nilssen
patent: 4945278 (1990-07-01), Chern
patent: 4949016 (1990-08-01), De Bijl et al.
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: 5408403 (1995-04-01), Nerone
patent: 5514981 (1996-05-01), Tam et al.
patent: 5712536 (1998-01-01), Haas et al.
Kachmarik David J.
Nerone Louis R.
Bruzga, Esq. Charles E.
General Electric Company
Shingleton Michael
LandOfFree
Compact lamp circuit structure having an inverter/boaster combin does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Compact lamp circuit structure having an inverter/boaster combin, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Compact lamp circuit structure having an inverter/boaster combin will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1709987