Discharge lamp lighting circuit

Details Discharge lamp lighting circuit Discharge lamp lighting circuit

2006-01-24

2006-01-24

Vo, Tuyet Thi (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S307000, C315S224000

Reexamination Certificate

active

06989638

ABSTRACT:
A discharge lamp lighting circuit includes an emission acceleration controller for detecting a lamp voltage for the discharge lamp, and supplying power greater than a rated value when the discharge lamp is initially lighted, and for gradually reducing the power supplied thereafter so as to shift the discharge lamp to a steady state. Power control is provided so that the power supplied to the discharge lamp is reduced in accordance with a rise in the voltage of a capacitor, and a charge current is supplied to the capacitor by current sources that provide a current that depends on the time elapsed since the lighting of the discharge lamp started and a second current that depends on a lamp voltage.

REFERENCES:
patent: 6163115 (2000-12-01), Ishizuka
patent: 6583587 (2003-06-01), Ito et al.
patent: 6750620 (2004-06-01), Suzuki
patent: 9-330795 (1997-12-01), None

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