Control device for discharge lamp

Details Control device for discharge lamp Control device for discharge lamp

2011-03-08

2011-03-08

Tran, Thuy Vinh (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

C315S225000, C315S226000, C315S291000, C315S307000

Reexamination Certificate

active

07902764

ABSTRACT:
A driving method for a discharge lamp having two cathodes includes providing a supply input voltage for providing an alternating voltage at the terminals of the cathodes, monitoring a condition of each of the cathodes and measuring a first direct voltage signal of the waveform of the voltage of the lamp that develops when the lamp approaches an ageing condition, deactivating the alternating voltage when a variation of the first direct voltage signal occurs, and supplying a second direct voltage signal proportional to the supply input voltage for deactivating the alternating voltage when a variation of the first direct voltage signal occurs in relation to the second direct voltage signal.

REFERENCES:
patent: 5475284 (1995-12-01), Lester et al.
patent: 5565740 (1996-10-01), Hiramatsu et al.
patent: 5883473 (1999-03-01), Li et al.
patent: 5969482 (1999-10-01), Gradzki
patent: 6288500 (2001-09-01), Klier
patent: 6362575 (2002-03-01), Chang et al.
patent: 2005/0001558 (2005-01-01), Buij et al.
patent: 1 322 142 (2003-06-01), None

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