Dimmer switch with adjustable high-end trim

Details Dimmer switch with adjustable high-end trim Dimmer switch with adjustable high-end trim

2011-03-15

2011-03-15

Vu, David Hung (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S307000, C315S360000, C307S140000

Reexamination Certificate

active

07906916

ABSTRACT:
A dimmer switch has a user adjustable high-end trim. The dimmer switch includes a bidirectional semiconductor switch, such as a triac, for controlling the amount of power delivered from a source of alternating current power to a lighting load, such as an electric lamp. A user-adjustable timing circuit controls the conduction time of the triac from a minimum time to a maximum time. The maximum possible conduction time of the triac is the high-end trim. The minimum possible conduction time of the triac is the low-end trim. The timing circuit includes a user-accessible switch that allows a user to reduce the high-end trim from a first nominal level to a second reduced level, lower than the first level, without substantially affecting the low-end trim. The switch allows a user to switch a transient voltage suppressor into and out of parallel connection with a resistor that is part of an RC timing circuit for the triac. The dimmer switch advantageously uses less energy and the lifetime of the lamp is extended when the second reduced level of the high-end trim is selected.

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Lutron Electronics Co., Inc., Skylark Fluorescent Dimmers Installation Instructions, Aug. 1999, 4 pages.
European Patent Office, International Search Report and Written Opinion, Nov. 7, 2007, 16 pages.

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