Electronic ballast for a high intensity discharge lamp

Details Electronic ballast for a high intensity discharge lamp Electronic ballast for a high intensity discharge lamp

2006-03-21

2006-03-21

Tran, Thuy V. (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S2090SC, C315SDIG002

Reexamination Certificate

active

07015655

ABSTRACT:
An electronic ballast for a discharge lamp is capable of dimming the lamp over a wide range, yet minimizing a color temperature deviation. The ballast includes a power converter which converts an input DC voltage into a lamp power for driving the lamp, and a dimmer providing a dimmer command of a varying dimming ratio in order to reduce the lamp power to a greater extent as the dimming ratio decreases. A controller controls the power converter to supply a high frequency AC current to the lamp in response to the dimming ratio decreasing to a predetermined level, and to reduce an RMS value of the high frequency AC current as the dimming ratio decreases past the predetermined level.

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International Search Report for PCT/JP02/04872 mailed on Oct. 1, 2003.

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