Dimmer protection

Details Dimmer protection Dimmer protection

2010-02-09

2011-12-13

Choi, Jacob Y (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

C315S127000, C315S291000, C315S308000

Reexamination Certificate

active

08076862

ABSTRACT:
A lighting installation comprises (a) a lighting load, powered by an AC power supply, said AC power supply having a cycle having a period; and (b) a dimmer comprising a first semiconductor switch operable by the action of a switching voltage to switch a current to the load on and off. In normal operation, the switch may repeatedly switch the current on and switch the current off. The average power delivered to the load is altered by altering the switching on or the switching off so that the current is on for a longer or shorter portion of the period. A method of protecting the dimmer comprises monitoring the current and, when the current exceeds a threshold value, altering the switching voltage to cause the first semiconductor switch to switch off the current.

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U.S. Appl. No. 12/791,712 filed Jun. 1, 2010.

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