Starting fluorescent lamps with a voltage fed inverter

Details Starting fluorescent lamps with a voltage fed inverter Starting fluorescent lamps with a voltage fed inverter

2007-10-31

2010-06-08

Owens, Douglas W (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

C315S2090SC, C315S277000

Reexamination Certificate

active

07733031

ABSTRACT:
A lamp ballast includes an inverter circuit, a resonant circuit, a control circuit, and a startup circuit. When the DC bus reaches its final value, a capacitor in the startup circuit charges to a predetermined voltage, at which point a pulse is sent to start a gate drive circuit in the inverter. Additionally, a gate in the control circuit is initially OFF, allowing full power to the lamp, and a capacitor in the control circuit charges to a predetermined voltage, at which point a gate is turned ON. When the gate is ON, power to the lamp is reduced. The control circuit capacitor is selected so that it charges for a sufficient period to allow the lamp to complete a glow phase of startup before turning on the gate and reducing power as the lamp transitions into an arc phase.

REFERENCES:
patent: 6051934 (2000-04-01), Nerone
patent: 6150769 (2000-11-01), Nerone et al.
patent: 6975076 (2005-12-01), Nerone
patent: 2003/0090217 (2003-05-01), Nerone
patent: 2003/0094907 (2003-05-01), Nerone
patent: 2007/0176564 (2007-08-01), Nerone et al.
patent: 0 828 408 (1998-03-01), None
PCT/US2008/073546 International Search Report, mailed Nov. 21, 2008.

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