Method and apparatus for a voltage controlled start-up...

Details Method and apparatus for a voltage controlled start-up... Method and apparatus for a voltage controlled start-up...

2006-01-24

2006-01-24

Tran, Thuy Vinh (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

C315S2090SC, C315SDIG002

Reexamination Certificate

active

06989637

ABSTRACT:
A voltage control startup circuit for a lighting ballast includes first and second transistors for converting direct current from a voltage source into alternating current to operate a lamp. The circuit includes an input portion for receiving a bus voltage signal, a resonant load portion for receiving a lamp load. The ballast also includes a start-up portion that delays firing of the lamp based on the detected bus voltage.

REFERENCES:
patent: 5177408 (1993-01-01), Marques
patent: 5838181 (1998-11-01), Hesterman
patent: 6222322 (2001-04-01), Stack
patent: 6781326 (2004-08-01), Stack

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