Discharge lamp lighting apparatus for lighting multiple...

Details Discharge lamp lighting apparatus for lighting multiple... Discharge lamp lighting apparatus for lighting multiple...

2007-05-08

2007-05-08

Vo, Tuyet Thi (Department: 2821)

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Discharge control discharge device load

C315S276000, C315S279000, C315S312000, C315S291000

Reexamination Certificate

active

11117491

ABSTRACT:
In a discharge lamp lighting apparatus to light two discharge lamps, one terminal of the secondary side of a step-up transformer is connected, via each of two variable inductance elements, to one terminal of each of the two discharge lamps, the other terminal of each of the two discharge lamp is connected to one lamp current detecting unit connected to a lamp current control circuit, a switch is provided at the previous step of the lamp current control circuit, an output signal from one phase adjusting circuit is connected, via the switch, to the connection portion of the lamp current detecting unit and the lamp current control circuit, and the inductance of each variable inductance element is varied by an output signal which is sent from the lamp current control circuit, and which has a phase shifted from others, whereby the lamp current flowing through each discharge lamp is controlled.

REFERENCES:
patent: 4814963 (1989-03-01), Petersen
patent: 2002/0047556 (2002-04-01), Tajika et al.
patent: 2002/0125863 (2002-09-01), Lin et al.
patent: A 2002-015895 (2002-01-01), None

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