Dimmer protection
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United States of America Patent
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Dec 13, 2011
Grant Date -
Aug 12, 2010
app pub date -
Feb 9, 2010
filing date -
Feb 9, 2009
priority date (Note) -
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status (Latency Note)
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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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