System and method of detecting temperature of a cooking utensil over a radiant cooktop

• US 7,307,246 B2
• Filed: 06/28/2004
• Issued: 12/11/2007
• Est. Priority Date: 06/28/2004
• Status: Active Grant

• Current Assignee: Haier US Appliance Solutions, Inc. DBA GE Appliances (Haier Group Company)
• Original Assignee: General Electric Company
• Inventors: Mathews, Harry Kirk Jr., Smolenski, Joseph Lucian
• Primary Examiner(s): Paschall; Mark
• Application Number:
  US10/878,067
• Publication Number:
  US 20050286609A1
• Time in Patent Office: 1,261 Days
• Field of Search: 219/448.11, 219/446.1, 219483-488, 219/494, 219/497, 219/502, 219/499, 219/505, 99325-331
• US Class Current: 219/497
• CPC Class Codes: G01K 1/14 Supports; Fastening devices; Arrangements for mounting thermometers in particular locations
• CPC Class Codes: G01K 1/16 Special arrangements for conducting heat from the object to the sensitive element
• CPC Class Codes: G01K 13/00 Thermometers specially adapted for specific purposes
• CPC Class Codes: G01K 2207/00 Application of thermometers in household appliances

Abstract

A system for detecting temperature of a cooking utensil over a radiant cooktop includes a cooktop having an upper surface and a lower surface and a radiant heating element adapted to heat the cooktop. A temperature detector is disposed adjacent the lower surface of the cooktop and is adapted to detect temperature of the lower surface of the cooktop. The system also includes a thermal insulation barrier disposed intermediate the temperature detector and the radiant heating element.

Claims

1. A system for detecting temperature of a cooking utensil over a radiant cooktop comprising:

a cooktop having an upper surface and a lower surface;

a radiant heating element adapted to heat the cooktop;

a temperature detector disposed adjacent the lower surface of the cooktop and adapted to detect temperature of the lower surface of the cooktop;

a thermal insulation barrier disposed intermediate the temperature detector and the radiant heating element, wherein the thermal insulation barrier is configured to shield a portion of the cooktop from the radiant heating element and create an area of reduced heat flux in the cooktop; and

a plurality of raised locations disposed on the upper surface of the cooktop adapted to provide contact between the upper surface of the cooktop and a cooking utensil disposed over the upper surface of the cooktop.

2. The system of claim 1,wherein the temperature of the lower surface of the cooktop is a representative of the temperature of a cooking utensil disposed over the upper surface of the cooktop.

3. The system of claim 1, wherein the cooktop comprises a ceramic material.

4. The system of claim 1, wherein the cooktop comprises a glass material.

5. The system of claim 1, wherein the temperature detector is a resistive thermal device.

6. The system of claim 1, wherein the temperature detector is a thermistor.

7. The system of claim 1, wherein the temperature detector is bonded to the lower surface of the cooktop.

8. The system of claim 1, wherein the temperature detector comprises a spring loaded sensor assembly for urging the temperature detector towards the lower surface of the cooktop.

9. The system of claim 1, wherein the thermal insulation barrier comprises a material compliant with the material of the cooktop.

10. The system of claim 1, wherein a radiant shield is disposed over the thermal insulation barrier.

11. The system of claim 10, wherein the radiant shield comprises gold.

12. The system of claim 1, wherein a minimum number of the raised locations is three.

13. A system for controlling operation of a radiant cooktop comprising:

a cooktop having an upper surface and a lower surface;

a radiant heating element adapted to heat the cooktop;

a temperature detector disposed adjacent the lower surface of the cooktop adapted to detect temperature of the lower surface of the cooktop;

a thermal insulation barrier disposed intermediate the temperature detector and the radiant heating element;

a controller coupled to the temperature detector and the radiant heating element for controlling temperature of the radiant cooktop based upon the temperature detected by the temperature detector; and

a plurality of raised locations disposed on the upper surface of the cooktop adapted to provide contact between the upper surface of the cooktop and a cooking utensil disposed over the upper surface of the cooktop.

14. The system of claim 13, wherein the temperature of the lower surface of the cooktop is a representative of the temperature of the cooking utensil disposed over the upper surface of the cooktop.

15. The system of claim 13, wherein the temperature detector is bonded to the lower surface of the cooktop.

16. The system of claim 13, wherein the temperature detector comprises a spring loaded sensor assembly for urging the detector towards the lower surface of the cooktop.

17. The system of claim 13, wherein a radiant shield is disposed over the thermal insulation barrier.

18. The system of claim 13, wherein a minimum number of the raised locations is three.

19. The system of claim 13, wherein the controller is operable to control a cooking feature of the cooktop.

20. The system of claim 19, wherein the cooking feature is boil detection of contents placed inside a cooking utensil disposed over the upper surface of the cooktop.

21. The system of claim 19, wherein the cooking feature is boil control of contents placed inside a cooking utensil disposed over the upper surface of the cooktop.

22. The system of claim 19, wherein the cooking feature is a no-load condition of the radiant cooktop.

23. A method of detecting a temperature of a cooking utensil over a radiant cooktop comprising:

disposing a temperature detector adjacent to a lower surface of a cooktop;

creating an area of reduced heat flux in the cooktop; and

sensing the temperature of the area of reduced heat flux via the temperature detector by providing contact between an upper surface of the cooktop and a cooking utensil disposed on the upper surface of the cooktop via a plurality of raised locations disposed on the upper surface of the cooktop.

24. The method of claim 23, wherein the temperature detector is bonded to the lower surface of the cooktop.

25. The method of claim 23, wherein the temperature detector is biased towards the lower surface of the cooktop via a resilient sensor assembly.

26. The method of claim 23, wherein creating an area of reduced heat flux comprises providing an insulation barrier adjacent to the temperature detector.

27. The method of claim 26, further comprising disposing a radiant shield over the thermal insulation barrier.

28. The method of claim 23, wherein a minimum number of the raised locations is three.

29. A method of controlling operation of a radiant cooktop comprising:

disposing a temperature detector adjacent a lower surface of a cooktop;

creating an area of reduced heat flux in the cooktop;

sensing a temperature of the area of reduced heat flux via the temperature detector by providing contact between an upper surface of the cooktop and a cooking utensil disposed on the upper surface of the cooktop via a plurality of raised locations disposed on the upper surface of the cooktop; and

controlling the temperature of the cooktop based upon the temperature sensed by the temperature detector.

30. The method of claim 29, wherein the temperature detector is bonded to the lower surface of the cooktop.

31. The method of claim 29, wherein the temperature detector is urged towards the lower surface of the cooktop via a resilient sensor assembly.

32. The method of claim 29, wherein creating an area of reduced heat flux comprises providing an insulation barrier adjacent to the temperature detector.

33. The method of claim 32, further comprising disposing a radiant shield over the thermal insulation barrier.

34. The method of claim 29, wherein controlling the temperature of the radiant cooktop comprises adjusting the power input to the radiant cooktop based upon the temperature sensed by the temperature detector.

35. The method of claim 29, wherein controlling the temperature of the radiant cooktop comprises controlling a cooking feature of the radiant cooktop based upon the temperature sensed by the temperature detector.