Discharge lamp driving

Details Discharge lamp driving Discharge lamp driving

1997-01-14

1999-08-03

Wong, Don

Electric lamp and discharge devices: systems

Current and/or voltage regulation

315209R, 315307, 315174, 315DIG5, 315DIG7, G05F 100

Patent

active

059329769

ABSTRACT:
A discharge lamp driving circuit includes DC voltage input connections, lamp driving connections, bridge circuitry, and control circuitry. The bridge circuitry is connected to the DC voltage input connections and to the lamp driving connections and includes circuit elements which in one mode of operation deliver a higher frequency AC voltage to the lamp driving connections and in another mode of operation deliver a lower frequency AC voltage to the lamp driving connections. The control circuitry is connected to control the bridge circuitry selectively as either a half-bridge to deliver the higher frequency AC voltage to the lamp driving connections during starting or a full-bridge to deliver only the lower frequency AC operating voltage to the lamp while the lamp is operating normally after starting. A low frequency driver and a high frequency driver are connected to drive the bridge circuitry.

REFERENCES:
patent: 3969652 (1976-07-01), Herzog
patent: 4734624 (1988-03-01), Nagase et al.
patent: 4912374 (1990-03-01), Nagase et al.
patent: 4949015 (1990-08-01), Nilssen
patent: 5491386 (1996-02-01), Eriguchi et al.
patent: 5517088 (1996-05-01), Blom
Laski, "High-Frequency Ballasting Techniques for High-Intensity Discharge Lamps", Ph.D. Dissertation 1994, Texas A&M University, Abstract.

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