Methods and apparatus for controlling a notification appliance circuit
First Claim
1. An arrangement for use in a safety notification system, comprising:
- a) an alarm signal power source, the alarm signal power source configured to generate bias power for activating a notification appliance circuit of a notification system;
b) at least a first semiconductor device having a load path coupled between the alarm signal power source and the notification appliance circuit;
c) a current sensing unit operably coupled to generate a sensing signal that is dependent on the current in the load path;
d) a controller circuit 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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Accused Products
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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Citations
16 Claims
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1. An arrangement for use in a safety notification system, comprising:
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a) an alarm signal power source, the alarm signal power source configured to generate bias power for activating a notification appliance circuit of a notification system; b) at least a first semiconductor device having a load path coupled between the alarm signal power source and the notification appliance circuit; c) a current sensing unit operably coupled to generate a sensing signal that is dependent on the current in the load path; d) a controller circuit 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An arrangement for use in a safety notification system, comprising:
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a) an alarm signal power source, the alarm signal power source configured to generate bias power for activating a notification appliance circuit of a notification system; b) at least a first semiconductor device having a load path coupled between the alarm signal power source and the notification appliance circuit; c) a current sensing unit operably coupled to generate a sensing signal that is dependent on the current in the load path; d) a hot swap controller operably connected to receive the current sensing signal and to control the first semiconductor device responsive to a current sensing signal, said control including limiting the current through the load path when said current exceeds an in-rush current threshold. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification