System and method for providing temporary power to intermittent units

• US 9,881,490 B2
• Filed: 05/11/2016
• Issued: 01/30/2018
• Est. Priority Date: 05/11/2016
• Status: Active Grant

• Current Assignee: Johnson Controls Fire Protection LP (Johnson Controls International plc)
• Original Assignee: Tyco Fire & Security GmbH (Johnson Controls International plc)
• Inventors: Feltham, Robert, Chiarizio, Martin
• Primary Examiner(s): Nguyen, Tai T
• Application Number:
  US15/152,099
• Publication Number:
  US 20170330450A1
• Time in Patent Office: 629 Days
• Field of Search: 340509, 340628, 340632, 340636, 340508, 340521, 340541
• CPC Class Codes: G08B 17/10 Actuation by presence of smoke or gases , e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
• CPC Class Codes: G08B 25/10 using wireless transmission systems G08B25/009 takes precedence
• CPC Class Codes: G08B 29/043 of fire detection circuits
• CPC Class Codes: G08B 29/181 due to failing power supply
• CPC Class Codes: H02J 7/0068 Battery or charger load switching, e.g. concurrent charging and load supply H02J7/0013 takes precedence

Abstract

A system and method for providing temporary power to an intermittent unit of a fire alarm system device. The intermittent unit is intermittently activated. The fire alarm system device includes a power storage unit for providing temporary power to the intermittent unit and a voltage converter for providing power at a voltage required by the intermittent unit. The fire alarm system device also includes a power control circuit for discharging the power storage unit through the intermittent unit when the intermittent unit first is activated and then switching to enable the voltage converter to power the intermittent unit.

Claims

1. A fire alarm device, comprising:

an intermittent unit that is intermittently activated;

a power storage unit for providing temporary power to the intermittent unit;

a voltage converter for providing power at a voltage required by the intermittent unit; and

a power control circuit for discharging the power storage unit through the intermittent unit when the intermittent unit first is activated and then switching to enable the voltage converter to power the intermittent unit.

2. The fire alarm device of claim 1, further comprising:

a wireless transceiver for enabling the fire alarm device to wirelessly communicate with a system controller; and

a battery for providing power to the voltage converter.

3. The fire alarm device of claim 1, wherein the voltage converter provides power to charge the power storage unit.

4. The fire alarm device of claim 1, further comprising a wired network interface for receiving power from a system network and supplying power to the voltage converter.

5. The fire alarm device of claim 1, further comprising

one or more batteries for providing power to the voltage converter;

and

one or more battery control circuits for testing the batteries by periodically discharging the batteries through test load resistors under the control of the device controller to assess battery reliability.

6. The fire alarm device of claim 1, wherein the power control circuit tests the power storage unit by periodically discharging the power storage unit via a test load resistor under the control of a device controller to assess a capacity of the power storage unit.

7. The fire alarm device of claim 1, wherein the power storage unit is a supercapacitor.

8. The fire alarm device of claim 1, wherein the intermittent unit is a strobe or a horn.

9. The fire alarm device of claim 1, further comprising an output control circuit for activating the intermittent unit by grounding the intermittent unit under control of a device controller.

10. The fire alarm device of claim 1, wherein the voltage converter includes a back feed protection unit to ensure that the power storage unit discharges through the intermittent unit.

11. The fire alarm device of claim 1, further comprising a device controller that controls the power control circuit to recharge the power storage unit less frequently than once a day.

12. The fire alarm device of claim 1, further comprising a device controller that controls the power control circuit to discharge the power storage unit through the intermittent unit until a current requirement of the intermittent unit is below a maximum current output for the voltage converter.

13. The fire alarm device of claim 1, wherein the intermittent unit instantly operates when the power control circuit discharges the power storage unit through the intermittent unit which decreases a response time between detection of a fire condition and the operation of the intermittent unit.

14. The fire alarm device of claim 13, wherein the response time is less than 10 seconds.

15. A fire alarm system, comprising:

one or more fire alarm devices, each of the devices including;

an intermittent unit that is intermittently activated, a power storage unit for providing temporary power to the intermittent unit, a voltage converter for providing power at a voltage required by the intermittent unit, and a power control circuit for discharging the power storage unit through the intermittent unit when the intermittent unit first is activated and then switching to enable the voltage converter to power the intermittent unit; and

a system controller for controlling the fire alarm system devices.

16. A method of operation of a fire alarm device, the method comprising:

intermittently activating an intermittent unit of the fire alarm device;

after activation, first providing temporary power to the intermittent unit from a power storage unit; and

then powering the intermittent unit with power from a voltage converter.

17. The method of claim 16, further comprising:

a system controller wirelessly communicating with the fire alarm system device; and

providing power to the voltage converter from a battery.

18. The method of claim 16, further comprising charging the power storage unit with the voltage converter.

19. The method of claim 16, further comprising receiving power from a system network and supplying power to the voltage converter.

20. The method of claim 16, further comprising

providing power to the voltage converter with one or more batteries;

and

periodically testing the batteries by discharging the batteries through test load resistors to assess battery reliability.

21. The method of claim 16, further comprising testing the power storage unit by periodically discharging the power storage unit through a test load resistor to assess a capacity of the power storage unit.

22. The method of claim 16, wherein the power storage unit is a supercapacitor.

23. The method of claim 16, wherein the intermittent unit is a strobe or a horn.

24. The method of claim 16, further comprising activating the intermittent unit by grounding the intermittent unit under control of a device controller.

25. The method of claim 16, further comprising discharging the power storage unit only through the intermittent unit.

26. The method of claim 16, further comprising recharging the power storage unit no more frequently than once a day.

27. The method of claim 16, further comprising discharging the power storage unit through the intermittent until a current requirement of the intermittent unit is below a maximum current output for the voltage converter.

28. The method of claim 16, wherein after providing the temporary power to the intermittent unit, the intermittent unit operates instantly thereby decreasing a response time between detection of a fire condition and the operation of the intermittent unit.

29. The method of claim 28, wherein the response time is less than 10 seconds.