Methods and apparatus for controlling a notification appliance circuit
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United States of America Patent
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Feb 12, 2013
Grant Date -
Mar 18, 2010
app pub date -
Feb 6, 2009
filing date -
Feb 8, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
An arrangement for use in a safety notification system includes an alarm signal power source, a first semiconductor device, a current sensing unit, and a controller unit. The alarm signal power source is configured to generate bias power for activating a notification appliance circuit of a notification system. The first semiconductor device has a load path coupled between the alarm signal power source and the notification appliance circuit. The current sensing unit is operably coupled to generate a sensing signal that is dependent on the current in the load path. The controller circuit is operably connected to receive the current sensing signal and to control the first semiconductor device responsive to a current sensing signal that exceeds an in-rush current threshold.
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