Magnetically sensed thermostat control

• US 6,741,158 B2
• Filed: 07/18/2002
• Issued: 05/25/2004
• Est. Priority Date: 07/18/2002
• Status: Expired due to Fees

• Current Assignee: Honeywell International Inc.
• Original Assignee: Honeywell International Inc.
• Inventors: Engler, Kevin J., Giuffre, Thomas R., Moyer, Thomas M., Ottens, Gregory J.
• Primary Examiner(s): Vortman, Anatoly
• Application Number:
  US10/199,167
• Publication Number:
  US 20040012477A1
• Time in Patent Office: 677 Days
• Field of Search: 337/54, 337/90, 337/98, 337/134, 337/344, 337/366, 324/207.2, 324/207.21, 324/251, 324/117.H
• US Class Current: 337/344
• CPC Class Codes: G05D 23/1902 characterised by the use of a variable reference value
• CPC Class Codes: H01H 37/56 having spirally wound or helically wound bimetallic element
• CPC Class Codes: H05B 1/0213 using bimetallic elements

Abstract

Methods and apparatuses for magnetically detecting a temperature change for thermostat control thereof are disclosed. A thermostat control device can be configured to include at least one bi-metallic strip that is configured to experience a change in angular position in response to a temperature change. The thermostat control device is generally associated with a Hall sensor, which includes a plurality of magnets that can experience movement relative to the Hall sensor in response to the change in the angular position of the bi-metallic strip. The temperature change can then be automatically and/or electrically detected in response to the movement of the magnets, wherein the temperature change is utilized for thermostat control thereof.

Claims

1. A method for magnetically detecting a temperature change for thermostat control thereof, said method comprising the steps of:

configuring a thermostat control device to include a thermostat and at least one bi-metallic strip that is configured to experience a change in angular position in response to a temperature change;

associating said thermostat control device with a Hall sensor comprising a plurality of magnets, wherein said plurality of magnets can experience a movement relative to said Hall sensor in response to said change in said angular position of said at least one bi-metallic strip; and

automatically detecting said temperature change in response to said movement of said plurality of magnets, thereby utilizing said temperature change for thermostat control thereof.

2. The method of claim 1 further comprising the step of:

electrically detecting said temperature change in response to said movement of said plurality of magnets.

3. The method of claim 1 further comprising the step of:

configuring said Hall sensor to further comprise at least one Hall transistor associated with said plurality of magnets.

4. The method of claim 3 further comprising the step of:

initiating a change in state of said Hall transistor in response to said change in said angular position of said bi-metallic strip, wherein said change in state comprises a change from a low state to a high state.

5. The method of claim 1 further comprising the step of:

associating said thermostat control device with a furnace having a power load thereof; and

coupling an output of said Hall sensor to a switching device for shifting said power load of said furnace.

6. The method of claim 5 further comprising the step of:

coupling said output of said Hall sensor to said switch utilizing a relay.

7. The method of claim 6 wherein said relay comprises a low current relay.

8. The method of claim 5 wherein the step of coupling an output of said Hall sensor to a switching device for shifting said power load of said furnace, further comprises the step of:

coupling an output of said Hall sensor via a coil to a switching device for shifting said power load of said furnace.

9. The method of claim 8 wherein said coil comprises a magnetic reed switch.

10. A method for magnetically detecting a temperature change for thermostat control thereof, said method comprising the steps of:

configuring a thermostat control device to include a thermostat and at least one bi-metallic strip that is configured to experience a change in angular position in response to a temperature change thereof, wherein said at least one bi-metallic strip comprises a coiled bi-metallic strip located within said thermostat control device;

associating said thermostat control device with a Hall sensor comprising at least one magnet thereof, wherein said at least one magnet can experience movement relative to said Hall sensor in response to said change in said angular position of said at least one bi-metallic strip and wherein said Hall sensor is located perpendicular to an opposing magnetic field;

locating said at least one magnet on a radial surface of said at least one bi-metallic strip;

automatically detecting said temperature change in response to said movement of said at least one magnet, thereby utilizing said temperature change for thermostat control thereof;

associating said thermostat control device with a furnace having a power load thereof and associated microprocessor control circuitry; and

coupling an output of said Hall sensor to a switching device for shifting said power load of said furnace and to said associated microprocessor control circuitry.

11. An apparatus for magnetically detecting a temperature change for thermostat control thereof, said apparatus comprising:

a thermostat control device that comprises a thermostat and at least one bi-metallic strip that is configured to experience a change in angular position in response to a temperature change thereof;

a Hall sensor associated with said thermostat control device, wherein said Hall sensor comprises a plurality of magnets, which can experience movement relative to said Hall sensor in response to said change in said angular position of said at least one bi-metallic strip; and

wherein said Hall sensor automatically detects said temperature change in response to said movement of said plurality of magnets, thereby utilizing said temperature change for thermostat control thereof.

12. The apparatus of claim 11 wherein said temperature change is electrically detected in response to said movement of said plurality of magnets.

13. The apparatus of claim 11 wherein said Hall sensor comprise at least one Hall transistor associated with said plurality of magnets.

14. The apparatus of claim 13 wherein a change in state of said Hall transistor is initiated in response to said change in said angular position of said bi-metallic strip, wherein said change in state comprises a change from a low state to a high state.

15. The apparatus of claim 11 further comprising:

said thermostat control device associated with a furnace having a power load thereof; and

an output of said Hall sensor coupled to a switching device for shifting said power load of said furnace.

16. The apparatus of claim 15 wherein said output of said Hall sensor is coupled to said switch utilizing a relay.

17. The apparatus of claim 16 wherein said relay comprises a low current relay.

18. The apparatus of claim 15 an output of said Hall sensor is coupled via a coil to a switching device for shifting said power load of said furnace.

19. The apparatus of claim 18 wherein said coil comprises a magnetic reed switch.

20. An apparatus for magnetically detecting a temperature change for thermostat control thereof, said apparatus comprising:

a thermostat control device comprising a thermostat and at least one bi-metallic strip that is configured to experience a change in angular position in response to a temperature change, wherein said at least one bi-metallic strip comprises a coiled bi-metallic strip located within said thermostat control device;

a Hall sensor associating said thermostat control device wherein said Hall sensor comprises at least one magnet thereof, such that said at least one magnet can experience movement relative to said Hall sensor in response to said change in said angular position of said at least one bi-metallic strip and wherein said Hall sensor is located perpendicular to an opposing magnetic field;

said at least one magnet located on a radial surface of said at least one bi-metallic strip;

wherein said Hall sensor automatically detects said temperature change in response to said movement of said at least one magnet, thereby utilizing said temperature change for thermostat control thereof;

said thermostat control device associated with a furnace having a power load thereof and associated microprocessor control circuitry; and

an output of said Hall sensor coupled to a switching device for shifting said power load of said furnace and to said associated microprocessor control circuitry.