Discharge lamp ballast and projector

Details Discharge lamp ballast and projector Discharge lamp ballast and projector

2004-09-07

2009-11-24

Vu, David Hung (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S224000, C315S308000

Reexamination Certificate

active

07622869

ABSTRACT:
A DC-DC converter111with a switching element Q11changes a supply of power to a HID lamp DL1. On/off of the element Q11is controlled with a control circuit13. The circuit13controls an on/off state of the element Q11with constant lamp power control on stable operation of the lamp. The circuit13controls the on/off state of the element Q11so as to provide the lamp with lamp power larger than lamp power by the constant lamp power control based on high power control for a period of time that the lamp is on. It is possible to keep temperature of electrodes and within a bulb of the lamp in a proper state through simple control, and to prevent flicker generation and electrode degradation.

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