Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Silicon controlled rectifier ignition
Reexamination Certificate
2005-04-12
2005-04-12
Philogene, Haissa (Department: 2828)
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Silicon controlled rectifier ignition
C315S219000, C315S307000, C315S276000, C315S282000, C315SDIG007
Reexamination Certificate
active
06879114
ABSTRACT:
A fluorescent lamp driver circuit has regulator (SR); primary circuit of transformer (TF); electronic switches (TR2A and TR2B) and current sensing device (Rsense) connected successively in series across power supply (PSF). Controller (CTRL) is connected to create a feed back loop. The secondary circuit of transformer (TF) is coupled to fluorescent lamps (U10and U11) via ballast capacitors (C1and C2). Diode (D1) creates unidirectional current flow, so current sensing device (Rsense) indicates only energy input to lamps (U10and U11). Capacitors (C1and C2) are placed physically very close to their respective lamps, enabling good matching of currents through lamps (U10and U11). Pulse width modulator (PM) with predetermined input is connected to regulator (SR) and, via delay circuit (TD) to controller (CTRL), thus permitting a larger dimming ratio, and further control of input power. Overvoltage detector (OVD) is connected to sense the voltage across inductor (L3) and transformer (TF) giving further control in the event of excess voltage.
REFERENCES:
patent: 5519289 (1996-05-01), Katyl et al.
patent: 5652479 (1997-07-01), LoCascio et al.
patent: 5754012 (1998-05-01), LoCascio et al.
patent: 5854538 (1998-12-01), Krummel
patent: 5892336 (1999-04-01), Lin et al.
patent: 6064155 (2000-05-01), Maya et al.
patent: 6083021 (2000-07-01), Lau
patent: 6181066 (2001-01-01), Adamson
patent: 6225742 (2001-05-01), Iida et al.
patent: 6326740 (2001-12-01), Chang et al.
patent: 39 02 984 (1990-08-01), None
patent: 0 587 923 (1992-09-01), None
patent: 2 212 995 (1989-08-01), None
patent: 2 271 479 (1994-04-01), None
patent: 57-180064 (1982-11-01), None
patent: 60-10554 (1985-01-01), None
patent: 8705436 (1987-09-01), None
E. Wells: “Using the UC3871 and UC3872 Resonant Fluorescent Lamp Drivers in Floating Lamp Applications” Unitrode Design Note DN-75, 1999.
M. Martin Alfonso, D. O'Sullivan: “10 watts DC/dc smart converter” Proceedings European Space Power Conference, 1995, pp. 73-79.
Copy of European Search Report.
Jales Richard James
Wilmott Barnaby Norman
Merchant & Gould P.C.
Philogene Haissa
Raymarine Limited
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