Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Impedance or current regulator in the supply circuit
Reexamination Certificate
2007-03-06
2007-03-06
Vu, David (Department: 2821)
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Impedance or current regulator in the supply circuit
C315S307000
Reexamination Certificate
active
10972810
ABSTRACT:
A circuit for controlling power to a high intensity discharge lamp is disclosed. The circuit according to one embodiment of the invention comprises a rectifier circuit coupled to receive an alternating current line voltage, and a boost/flyback converter coupled to the rectifier circuit which outputs a regulated DC bus voltage. A power control circuit also couples a feedback signal to the boost/flyback converter to regulate the power output of the boost/flyback converter. A method of controlling power to a high intensity discharge lamp is also disclosed. The method comprises steps of generating a DC voltage for the high intensity discharge lamp by way of a boost/flyback converter; monitoring the DC voltage and the current generated in the boost/flyback converter; and modifying the power output by the boost/flyback converter to regulate power based upon the voltage and the current.
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patent: 6051935 (2000-04-01), Bucks et al.
patent: 6118673 (2000-09-01), Hua
patent: 6204614 (2001-03-01), Erhardt
patent: 6489754 (2002-12-01), Blom
patent: 6570366 (2003-05-01), Lin et al.
Fitch Even Tabin & Flannery
Osram Sylvania Inc.
Vu David
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