Electronic ballast for a discharge lamp

Details Electronic ballast for a discharge lamp Electronic ballast for a discharge lamp

2006-02-21

2006-02-21

Tran, Thuy V. (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S307000, C315S308000, C315S224000, C315S360000

Reexamination Certificate

active

07002305

ABSTRACT:
An electronic ballast for a discharge lamp has a controller that increase luminous flux of the lamp to a stabilized level in a constant time irrespective of possible variations in lamp characteristic. The controller utilizes a reference lamp power table and a reference lamp voltage table respectively defining a reference lamp power and a reference voltage varying with time. The controller includes a voltage deviation detector that gives a voltage correction index indicating a voltage deviation between the reference voltage and a monitored lamp voltage. The voltage correction index is processed at an offset provider that gives an offset power. A target power generator is included to correct the reference lamp power in view of the offset power, thereby generating a target lamp power which is constantly updated and is supplied to the lamp.

REFERENCES:
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patent: 5212428 (1993-05-01), Sasaki et al.
patent: 6693393 (2004-02-01), Konishi et al.
patent: 2003/0160576 (2003-08-01), Suzuki
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patent: 08-330089 (1996-12-01), None
patent: 2946384 (1999-07-01), None
International Search Report for PCT/JP03/12227 mailed on Jan. 27, 2004.

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