System and methods for dimming a high pressure arc lamp

Details System and methods for dimming a high pressure arc lamp System and methods for dimming a high pressure arc lamp

2011-04-19

2011-04-19

Choi, Jacob Y (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S307000, C315S224000

Reexamination Certificate

active

07928665

ABSTRACT:
A driver circuit provides a drive current from a power source to an arc lamp to produce a light. The circuit includes a transformer having primary and secondary windings, with the ends of the secondary winding providing the lamp drive current to the arc lamp. A current steering module provides a drive output from the power source to the transformer in response to a current steering input, and a current control loop adjusts the current steering input in response to the current in one of the windings of the transformer. A luminance control loop adjusts the current steering input in response to the brightness of the light and a luminance command. A power control module may be further provided to generate a boost command in response to a difference between the brightness of the arc lamp and a luminance command.

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