Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Reexamination Certificate
2005-04-05
2005-04-05
Tran, Thuy Vinh (Department: 2821)
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
C315S20000A, C315S224000, C315S149000
Reexamination Certificate
active
06876160
ABSTRACT:
A ballast with circuitry to allow the level of the lighting device to be adjusted, a separate direct current input and a sensing circuit within the ballast to lower the light level and thus the amount of power required from the direct current input when the normal line power fails. A method of recharging the battery by supply current to flow out of the direct current input when the ballast is operating from line power is also provided.
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Marrs Roger A.
Tran Thuy Vinh
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