Discharge lamp lighting apparatus

Details Discharge lamp lighting apparatus Discharge lamp lighting apparatus

2006-09-21

2009-02-24

Owens, Douglas W (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Keyboard operated or pattern controlled regulator

C315S291000, C315S293000, C315S307000, C315S308000, C315S309000, C315S310000, C315S311000, C315S224000, C315S225000, C315S267000, C315S246000, C315S2090SC

Reexamination Certificate

active

07495398

ABSTRACT:
A discharge lamp lighting apparatus includes: an inverter circuit including a switch circuit and a high-voltage transformer; a step-up circuit connected at the input stage of the inverter circuit; a control circuit to output a switch circuit controlling signal and a step-up circuit controlling signal; an on-off switching circuit connected at a input voltage line; and a switch signal buffering circuit connected between the control circuit and the switch circuit and adapted to relay the switch circuit controlling signal. A drive voltage is applied to the control circuit without going through the on-off switching circuit, and a drive voltage is applied to the switch signal buffering circuit via the on-off switching circuit. With such a structure, an excess rush current is inhibited from flowing into the discharge lamp thereby preventing its electrode wear and therefore increasing the product life of a lamp and enhancing reliability while achieving cost reduction and downsizing.

REFERENCES:
patent: 2007/0138975 (2007-06-01), Suganuma et al.
patent: 2001160497 (1999-01-01), None
patent: A 2001-160497 (2001-06-01), None

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