A.C. powered detecting device with battery backup
First Claim
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1. In a warning device, means for connecting with power from a first source thereof;
- means for connecting with power from a second source thereof, said second source comprising a battery;
means for emitting a signal, said emitting means having an active state in which said signal is emitted and an inactive state in which said signal is not emitted;
means for detecting the presence of predetermined phenomena;
means responsive to said detecting means for placing said emitting means in said active state;
means for monitoring the output voltage of said battery and for placing said emitting means in said active state when said voltage equals a first predetermined value; and
means for applying power from said first source thereof to said emitting means, said detecting means, said responsive means and said monitoring means, and for applying power thereto from said second source thereof upon interruption of power from said first source.
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Abstract
An improved a.c. voltage powered warning device for detecting the occurrence of predetermined phenomena, is characterized by battery backup for providing power to the device in the event of interruption of the a.c. voltage. In the disclosed embodiments the warning device is a fire detector having circuitry for supervising the energy level of the backup battery and for providing a warning upon the energy level decreasing to a predetermined value, and for testing a combustion detecting and alarm generating portion of the detector.
44 Citations
29 Claims
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1. In a warning device, means for connecting with power from a first source thereof;
- means for connecting with power from a second source thereof, said second source comprising a battery;
means for emitting a signal, said emitting means having an active state in which said signal is emitted and an inactive state in which said signal is not emitted;
means for detecting the presence of predetermined phenomena;
means responsive to said detecting means for placing said emitting means in said active state;
means for monitoring the output voltage of said battery and for placing said emitting means in said active state when said voltage equals a first predetermined value; and
means for applying power from said first source thereof to said emitting means, said detecting means, said responsive means and said monitoring means, and for applying power thereto from said second source thereof upon interruption of power from said first source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
- means for connecting with power from a second source thereof, said second source comprising a battery;
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14. In a warning device, a power source comprising a battery;
- means for emitting a signal;
means for detecting the presence of predetermined phenomena;
means responsive to said detecting means for causing said emitting means to emit said signal, and means for monitoring the output voltage of said battery and for causing said emitting means to emit said signal when said voltage equals a first predetermined value, said monitoring means including means for establishing a first voltage representative of said battery voltage, means for establishing a reference voltage, a unijunction transistor connected at a gate thereof with said first voltage, a first diode connected at a cathode thereof with said transistor gate and at an anode thereof with said reference potential, a second diode connected at a cathode thereof with said reference potential and at an anode thereof with an anode of said transistor, said transistor comparing said first and said reference voltages and being rendered conductive upon said first voltage differing from said reference voltage by a predetermined amount, and circuit means connected with said transistor and said emitting means and responsive to conduction of said transistor to cause said emitting means to emit said signal. - View Dependent Claims (15, 16, 17, 18)
- means for emitting a signal;
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19. In a warning device, means for connecting with power from a first source thereof;
- means for connecting with power from a second source thereof, said second source comprising a battery;
means for providing first and second audible warnings, said first audible warning being sensually discernable from said second warning;
sensor means for detecting the presence of combustion;
means responsive to said sensor means for causing said providing means to provide said first warning;
means for monitoring the output voltage of said battery and for causing said providing means to provide said second warning when said voltage equals a predetermined value, and means for applying power from said first source thereof to said providing, sensor, responsive and monitoring means, and for applying power thereto from said second source upon interruption of power from said first source. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
- means for connecting with power from a second source thereof, said second source comprising a battery;
Specification