Cooktop with temperature sensor

• US 20030029858A1
• Filed: 08/16/2002
• Published: 02/13/2003
• Est. Priority Date: 02/16/2000
• Status: Active Grant

• Current Assignee: BSH Hausgeraete GmbH (Robert Bosch GmbH)
• Original Assignee: BSH Bosch und Siemens Hausgerã¤Te GmbH (Robert Bosch GmbH)
• Inventors: Has, Uwe, Vetterl, Peter, Neumayer, Dan, Zeraschi, Monika, Theine, Markus, Gratz, Franz
• Granted Patent: US 6,753,509 B2
• Time in Patent Office: Days
• US Class Current: 219/448.17
• CPC Class Codes: H05B 2213/07 Heating plates with temperature control means
• CPC Class Codes: H05B 3/746 Protection, e.g. overheat cutoff, hot plate indicator

Abstract

In a cooktop with a cooktop plate, in particular, made from glass ceramic, beneath which at least one heating element is disposed, for heating a cooking vessel to be placed on the cooktop plate, and having a temperature sensor for recording the temperature of the cooktop plate, which temperature sensor senses the temperature of the underside of the cooktop plate within the heating element and is shielded from the thermal radiation from a heating device of the heating element by insulating material, and is connected to a control unit for controlling the heating power of the heating element, to enable a good measurement accuracy to be achieved, the temperature sensor is in thermal contact with the underside of the cooktop plate by a thermally conductive element, and that the element and the temperature sensor are shielded from the thermal radiation of the heating device by insulating material.

Claims

1. A cooktop, comprising:

a glass ceramic cooktop panel having an underside;

at least one heating element having a heating device for emitting thermal radiation, said heating element disposed beneath said cooktop panel for heating up a cooking vessel to be placed on said cooktop panel;

a control unit electrically connected to said at least one heating element for controlling a heating power of said at least one heating element;

a temperature sensor electrically connected to said control unit for controlling said heating power of said at least one heating element;

a heat-conducting element holding said temperature sensor in heat-conducting contact at said underside of said cooktop panel within said at least one heating element;

said temperature sensor sensing a temperature of said underside of said cooktop panel within said at least one heating element; and

insulating material shielding said temperature sensor and said heat-conducting element from the thermal radiation.

2. The cooktop according to claim 1, wherein:

said heat-conducting element has an underside;

said temperature sensor is secured to said underside of said heat-conducting element, and

said heat-conducting element is pressed onto said underside of said cooktop panel.

3. The cooktop according to claim 1, wherein:

said temperature sensor has a base area;

said heat-conducting element has a surface region in thermal contact with said underside of said cooktop panel; and

said surface region is at least approximately 5 times larger than said base area.

4. The cooktop according to claim 3, wherein said surface region is at least approximately 10 times larger than said base area.

5. The cooktop according to claim 1, wherein:

said insulating material has an edge region; and

a lateral spacing of said heat-conducting element with respect to said edge region of said insulating material is between approximately 6 mm and 12 mm.

6. The cooktop according to claim 7, wherein a lateral spacing of said heat-conducting element with respect to said edge region of said insulating material is approximately 8 mm.

7. The cooktop according to claim 1, wherein:

said at least one heating element has a temperature limiter; and

said temperature sensor is disposed in a region of said temperature limiter.

8. The cooktop according to claim 1, wherein:

said at least one heating element has a temperature limiter; and

said temperature sensor is disposed adjacent said temperature limiter.

9. The cooktop according to claim 1, wherein:

said heat-conducting element has an inside; and

said temperature sensor is fastened to said inside of said heat-conducting element by casting.

10. The cooktop according to claim 1, wherein:

said heat-conducting element has an inside; and

said temperature sensor is cast to said inside of said heat-conducting element.

11. The cooktop according to claim 1, wherein said heat-conducting element is:

a spring element; and

limited to a region of said temperature sensor, pressed onto said underside of said cooktop panel.

12. The cooktop according to claim 1, wherein said heat-conducting element is:

a spring element; and

pressed onto said underside of said cooktop panel at a region of said temperature sensor.

13. The cooktop according to claim 1, wherein said heat-conducting element:

has an upper wall and side walls; and

is approximately shroud-shaped at least in a region of said temperature sensor.

14. The cooktop according to claim 1, wherein said side walls of said heat-conducting element are skirt shaped.

15. The cooktop according to claim 1, wherein said side walls of said heat-conducting element have a skirt shape.

16. The cooktop according to claim 13, wherein:

said heat-conducting element has a shroud with a bottom side; and

said shroud is at least partly closed on said bottom side.

17. A cooktop, comprising:

a glass ceramic cooktop panel having an underside;

at least one heating element having a heating device for emitting thermal radiation, said heating element disposed beneath said cooktop panel for heating up a cooking vessel to be placed on said cooktop panel;

a control unit electrically connected to said at least one heating element for controlling a heating power of said at least one heating element;

a temperature sensor electrically connected to said control unit for controlling said heating power of said at least one heating element;

a heat-conducting element holding said temperature sensor in heat-conducting contact at said underside of said cooktop panel within said at least one heating element;

said temperature sensor sensing a temperature of said underside of said cooktop panel within said at least one heating element; and

insulating material substantially shielding said temperature sensor and said heat-conducting element from the thermal radiation.

18. In a cooktop having a glass ceramic cooktop panel with an underside, at least one heating element having a heating device for emitting thermal radiation and disposed beneath the cooktop panel for heating up a cooking vessel to be placed on the cooktop panel, a control unit electrically connected to the at least one heating element for controlling a heating power of the at least one heating element, and a temperature sensor sensing a temperature of the underside of the cooktop panel within the at least one heating element, in heat-conducting contact with the underside of the cooktop panel within the at least one heating element, and electrically connected to the control unit, a temperature sensor holder comprising:

a heat-conducting element holding said temperature sensor in heat-conducting contact at said underside of said cooktop panel within said at least one heating element; and

insulating material substantially shielding the temperature sensor and said heat-conducting element from the thermal radiation of the heating device.

19. The temperature sensor holding according to claim 18, wherein said heat-conducting element is a removable part of the at least one heating element.

20. In a cooktop having a glass ceramic cooktop panel with an underside, a control unit, and a temperature sensor electrically connected to the control unit, a heater comprising:

at least one heating element having a heating device for emitting thermal radiation, said at least one heating element electrically connected to the control unit for controlling a heating power of said at least one heating element and disposed beneath the cooktop panel for heating up a cooking vessel to be placed on the cooktop panel;

a heat-conducting element holding the temperature sensor in heat-conducting contact at the underside of the cooktop panel within said at least one heating element to sense a temperature thereof; and

insulating material substantially shielding the temperature sensor and said heat-conducting element from the thermal radiation of said heating device.