Discharge lamp illumination circuit

Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Periodic switch in the primary circuit of the supply...

Reexamination Certificate

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Details

C315S2090SC, C315S291000, C315S224000

Reexamination Certificate

active

07075246

ABSTRACT:
A discharge lamp illumination circuit1has a DC-AC conversion circuit3which effects AC conversion and boosting upon receipt of a DC input, and a starter circuit4for supplying a start-up signal to a discharge lamp. Power output from the DC-AC conversion circuit3is controlled by control means6, thereby controlling illumination of a discharge lamp10. An AC transformer7constituting the DC-AC conversion circuit3is provided, and a primary circuit and a secondary circuit, both forming part of the AC transformer7, are insulated from each other. The start-up signal boosted by the AC transformer7is superposed on the AC-converted output, and the resultant signal is supplied to the discharge lamp10. Thus, the need for a starter transformer specifically designed for startup can be obviated.

REFERENCES:
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patent: 5151631 (1992-09-01), Oda et al.
patent: 5233273 (1993-08-01), Waki et al.
patent: 5406471 (1995-04-01), Yamanaka
patent: 5495405 (1996-02-01), Fujimura et al.
patent: 5714845 (1998-02-01), Heering et al.
patent: 5742497 (1998-04-01), Hashimoto et al.
patent: 6034487 (2000-03-01), Yamashita et al.
patent: 6188180 (2001-02-01), Diamond
patent: 7-142182 (1995-06-01), None
patent: 7-169583 (1995-07-01), None
Gulko et al., “A MHz Electronic Ballast for Automotive-Type HID Lamps,” IEEE 1:39-45, Jun. 22, 1997.

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