Infrared temperature sensing in induction cooking systems

• US 10,356,853 B2
• Filed: 08/29/2016
• Issued: 07/16/2019
• Est. Priority Date: 08/29/2016
• Status: Active Grant

• Current Assignee: Cooktek Induction Systems, LLC (Middleby Corporation)
• Original Assignee: Cooktek Induction Systems, LLC (Middleby Corporation)
• Inventors: Metz, Reinhard
• Primary Examiner(s): Nguyen, Hung D
• Application Number:
  US15/250,439
• Publication Number:
  US 20180063892A1
• Time in Patent Office: 1,051 Days
• Field of Search: 219620, 219621, 219622, 219625, 219627
• CPC Class Codes: G01J 5/02 Constructional details
• CPC Class Codes: G01J 5/041 Mountings in enclosures or in a particular environment
• CPC Class Codes: H05B 6/06 Control, e.g. of temperature, of power
• CPC Class Codes: H05B 6/062 for cooking plates or the like
• CPC Class Codes: H05B 6/12 Cooking devices
• CPC Class Codes: H05B 6/1281 with flat coils

Abstract

An induction cooking system. The induction cooking system includes a base, one or more side walls, an induction coil, and an infrared temperature sensor. The base includes a base surface associated therewith. The base surface includes a window. The window is disposed within the base surface. The one or more side walls define a well above the base surface. The well is configured to receive a vessel disposed above the base surface. The induction coil is disposed within the base. The induction coil defines a first surface that is disposed below the base surface. The induction coil also defines a second surface that is disposed opposite from the first surface. The induction coil further defines an aperture disposed adjacent to the window and extending from a first surface toward a second surface of the induction coil. The infrared temperature sensor is disposed adjacent to the window and within the aperture.

Claims

1. An induction cooking system, comprising:

a base including a base surface associated therewith, the base surface having a window disposed within the base surface;

one or more side walls defining a well above the base surface, the well configured to receive a vessel disposed above the base surface;

an induction coil disposed within the base, the induction coil defining

a first surface disposed below the base surface,

a second surface disposed opposite the first surface, and

an aperture disposed adjacent the window and extending from the first surface toward the second surface;

an infrared temperature sensor disposed adjacent to the window and within the aperture; and

an electronic controller electrically coupled to the infrared temperature sensor and configured to determine a compensated temperature measurement based at least in part on a material of the window, wherein the controller is configured to determine the compensated temperature measurement by applying the following algorithm;

T_compensated=a+(b×

T_measured²), in which T_compensated is the compensated temperature, a is an additive constant, b is a function of an attenuation curve with respect to frequency, and T_measured is a temperature measurement taken by the infrared temperature sensor.

2. The induction cooking system of claim 1, wherein the window comprises polyethylene plastic.

3. The induction cooking system of claim 2, wherein the base surface comprises bulk molding compound.

4. The induction cooking system of claim 1, wherein the base surface comprises bulk molding compound.

5. The induction cooking system of claim 1, further comprising a gap between a bottom of the vessel and the base surface.

6. The induction cooking system of claim 1, wherein the vessel includes a rim protruding outward from a top portion of the vessel and configured to rest on a ledge extending around a top of the well when the vessel is disposed within the well.

7. The induction cooking system of claim 1, wherein the aperture extends from the first surface to the second surface.

8. The induction cooking system of claim 1, wherein the aperture is positioned at a center of the first surface.

9. The induction cooking system of claim 1, wherein the aperture is offset from a center of the first surface.

10. The induction cooking system of claim 9, wherein the aperture is a first aperture, and wherein the induction coil further defines a second aperture disposed at the center of the first surface.

11. The induction cooking system of claim 1, wherein the aperture is positioned midway between a center of the first surface and a periphery of the first surface.

12. The induction cooking system of claim 1, wherein the first surface and the second surface are generally circular.

13. The induction cooking system of claim 12, wherein the aperture is concentric with the first surface.

14. The induction cooking system of claim 1, wherein the infrared temperature sensor is configured to measure an amount of infrared radiation transmitted through the window.

15. The induction cooking system of claim 1, further comprising a power supply electrically coupled to the electronic controller and the induction coil, the power supply configured to provide a current supply to the induction coil.

16. The induction cooking system of claim 1, wherein the electronic controller is further configured to adjust an energy output of the induction coil based at least in part on the compensated temperature measurement.

17. An induction cooking system, comprising:

a base including a base surface associated therewith, the base surface having a window disposed within the base surface;

one or more side walls defining a well above the base surface, the well configured to receive a vessel disposed above the base surface;

an induction coil disposed within the base, the induction coil defining an aperture disposed adjacent the window;

an infrared temperature sensor disposed adjacent to the window and within the aperture; and

an electronic controller electrically coupled to the infrared temperature sensor and configured to determine a compensated temperature measurement based at least in part on a material of the window and on a temperature measurement taken by the infrared temperature sensor,

wherein the controller is configured to determine the compensated temperature measurement based on a correction factor derived from attenuation contributed by the window with respect to frequency.

18. The induction cooking system of claim 17, further comprising a power supply electrically coupled to the electronic controller and the induction coil, the power supply configured to provide a current supply to the induction coil, wherein the electronic controller is further configured to adjust an energy output of the induction coil based at least in part on the compensated temperature measurement.

19. The induction cooking system of claim 17, wherein the controller is configured to determine the compensated temperature measurement by applying the following algorithm:

T_compensated=a+(b×

T_measured²), in which T_compensated is the compensated temperature, a is an additive constant, b is a function of an attenuation curve with respect to frequency, and T_measured is the temperature measurement taken by the infrared temperature sensor.