Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Impedance or current regulator in the supply circuit
Reexamination Certificate
2006-09-19
2006-09-19
Tran, Thuy V. (Department: 2821)
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Impedance or current regulator in the supply circuit
C315S308000, C315S299000, C315SDIG002
Reexamination Certificate
active
07109665
ABSTRACT:
A three-way dimming CFL ballast operates at a single high bus voltage while varying switching frequency to control lamp current. The ballast accepts three different light level input switch command positions and an off position to provide three different light output levels. A closed loop current feedback control maintains a precise switching frequency for the ballast to produce accurate light output levels based on the light output switch selection. A reference value is provided to the feedback loop based on the selected light output level to drive the switching frequency at the appropriate value. The ballast circuit provides a sufficient CFL control for three-way dimming as adapted to be used with a standard Edison screw base.
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International Rectifier Corporation
Ostrolenk Faber Gerb & Soffen, LLP
Tran Chuc
Tran Thuy V.
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