Controlling a lamp ballast

Details Controlling a lamp ballast Controlling a lamp ballast

2007-07-17

2010-11-16

Vu, David Hung (Department: 2821)

Electric lamp and discharge devices: systems

With cathode or cathode heater supply circuit

C315S105000, C315S307000, C315S308000

Reexamination Certificate

active

07834552

ABSTRACT:
A method and apparatus for providing electrical current to a lamp, detecting a power supply voltage outage, detecting a return of the power supply voltage, determining how long the power supply voltage outage lasted, and preheating the lamp responsive to determining that the power supply voltage outage lasted greater than a threshold amount of time.

REFERENCES:
patent: 6617805 (2003-09-01), Ribarich et al.
patent: 6963178 (2005-11-01), Lev et al.
patent: 7002305 (2006-02-01), Kambara et al.
patent: 7378807 (2008-05-01), Feldtkeller et al.
patent: 102004037390 (2006-03-01), None
patent: 9510168 (1995-04-01), None

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