Electronic ballast for a lamp

Details Electronic ballast for a lamp Electronic ballast for a lamp

2006-04-13

2008-09-02

Vu, David H (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

C315S243000, C315S307000, C315SDIG002

Reexamination Certificate

active

07420334

ABSTRACT:
An electronic ballast for a lamp having a bridge circuit, includes at least one first switch and a second switch coupled between a connection for a supply voltage and a connection for a ground potential, a center point of the bridge circuit between the first switch and second switches; a first and a second connection for a lamp the first connection coupled to the center point; and a signal evaluation unit. The evaluation unit includes a first input coupled to a signal which is at the DC voltage level of the first connection, and second input coupled to a signal which is at the DC voltage level of the second connection, the DC voltage reference potential for the evaluation unit being designed to be variable within a value range which is greater than or equal to the ground potential and is less than or equal to the supply voltage potential.

REFERENCES:
patent: 4560908 (1985-12-01), Stupp et al.
patent: 4727470 (1988-02-01), Nilssen
patent: 5808422 (1998-09-01), Vankitasubrahmanian et al.
patent: 1 003 357 (2000-05-01), None
patent: 1 404 162 (2004-03-01), None
European Search Report dated Aug. 22, 2006 from corresponding EP Application No. 06007435.8-2206, 6 pages.

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