Power stealing control devices

• US 7,476,988 B2
• Filed: 11/23/2005
• Issued: 01/13/2009
• Est. Priority Date: 11/23/2005
• Status: Active Grant

• Current Assignee: Ademco Inc. (Resideo Technologies, Inc.)
• Original Assignee: Honeywell International Inc.
• Inventors: McNamara, Curtis B., Juntunen, Robert D., Mulhouse, David P.
• Primary Examiner(s): Deberadinis; Robert L.
• Application Number:
  US11/164,464
• Publication Number:
  US 20070114848A1
• Time in Patent Office: 1,147 Days
• Field of Search: 307/66
• US Class Current: 307/66
• CPC Class Codes: H02J 7/34 Parallel operation in networks using both storage and other dc sources, e.g. providing buffering H02J7/14 takes precedence
• CPC Class Codes: H02J 9/061 for DC powered loads
• CPC Class Codes: Y02B 10/70 Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
• CPC Class Codes: Y02B 90/10 Applications of fuel cells in buildings

Abstract

A power stealing system having a switch and a circuit that takes power from equipment to operate control electronics. The system may be such that power stealing occurs while the equipment is not powered to avoid disruption or false signals in the electronics or equipment. The circuit may convey taken power to a storage device. The electronics may be powered by the storage device. The storage device may have a capacitor, a rechargeable battery, a non-chargeable battery, a solar cell, fuel cell, line power, and/or the like.

Claims

1. A power stealing system comprising:

a switch for switching power on and off to an electrical load;

a control circuit connected to the switch;

a storage device connected to the control circuit, wherein the control circuit conveys power from the switch to the storage device when the switch is off;

a controller connected to the switch and control circuit, wherein the controller is configured to control the switching of the switch;

a secondary power supply; and

wherein the control circuit is configured to convey power from the storage device to the controller, and if the storage device does not have sufficient power to power the controller, the control circuit conveys power from the secondary power supply to the controller.

2. The system of claim 1, wherein the switch is connectable between a set of terminals and may result in the load being powered if the terminals are electrically connected to each other.

3. The system of claim 2, wherein a voltage potential may exist across the terminals when not connected to each other.

4. The system of claim 3, wherein the control circuit may convey power from the terminals to the storage device.

5. The system of claim 4, wherein the storage device is a capacitor.

6. The system of claim 4, wherein the storage device is a rechargeable battery.

7. The system of claim 4, wherein the switch is a relay.

8. The system of claim 7, wherein the switch is a latching relay.

9. The system of claim 4, wherein the switch is a solid state device.

10. The system of claim 4, wherein:

the secondary power supply is a backup battery; and

the backup battery is for providing power in lieu of, or in addition, the storage device.

11. The system of claim 4, wherein:

the secondary power supply is a solar cell; and

the solar cell is for providing power in lieu of, or in addition to, the storage device.

12. The system of claim 4, wherein:

the secondary power supply is a fuel cell; and

the fuel cell is for providing power in lieu of, or in addition to, the storage device.

13. A method for stealing power, comprising:

switching power on or off to an electrical load with a switch;

conveying power as needed from the switch, when the switch is off and no power is provided to the electrical load, to a storage device; and

powering control electronics that control the switching of the switch, at least in part, with the power stored in the storage device.

14. The method of claim 13, wherein the switch has a topology such that upon switching the power off to the electrical load, the terminals of the switch are connected to the storage device.

15. The method of claim 14, wherein the storage device is a capacitor.

16. The method of claim 14, wherein the storage device is a rechargeable battery.

17. The method of claim 14, further comprising providing a backup power source to provide power in lieu of, or in addition to, the storage device.

18. The method of claim 17, wherein the backup power source is a battery.

19. The system of claim 17, wherein the backup power source is a solar cell.

20. The system of claim 17, wherein the backup power source is a fuel cell.

21. The method of claim 13 wherein the control electronics include a microcontroller to control the switching of power to the electrical load.

22. A system for taking power, comprising:

a switch for connection between a power source and a load;

a conveyance circuit connected to the switch;

a storage mechanism connected to the conveyance circuit;

a controller connected to the switch; and

wherein the controller is powered by the storage mechanism at least some of the time.

23. The system of claim 22, wherein:

the switch is a relay having a first position for connecting the power source and the load, and having a second position disconnecting the power source and the load; and

the conveyance circuit may convey power from the switch in the second position to the storage mechanism.

24. The system of claim 23, wherein a default position of the switch is the second position.

25. The system of claim 24, wherein if the controller receives insufficient power from the storage mechanism, then the switch will be in the default position.

26. The system of claim 25, further comprising:

a backup battery; and

wherein the backup battery is connected to the controller when the switch is in the default position.

27. The system of claim 25, further comprising:

a backup power source; and

wherein the backup power source is a solar cell.

28. The system of claim 25, further comprising:

a backup power source; and

wherein the backup power source is a fuel cell.

29. The system of claim 22, wherein the storage mechanism is a capacitor.

30. The system of claim 22, wherein the storage mechanism is a chargeable battery.

31. The system of claim 22, wherein the switch is a relay.

32. The system of claim 22, wherein the switch is a solid state device.