INDUCTION COOKING ELECTROMAGNETIC INDUCED REJECTION METHODS

• US 20130175259A1
• Filed: 01/11/2012
• Published: 07/11/2013
• Est. Priority Date: 01/11/2012
• Status: Active Grant

• Current Assignee: Haier US Appliance Solutions, Inc. DBA GE Appliances (Haier Group Company)
• Original Assignee: General Electric Company
• Inventors: Brosnan, Daniel Vincent, Etheredge, John L.
• Granted Patent: US 9,345,072 B2
• Time in Patent Office: Days
• US Class Current: 219/621
• CPC Class Codes: H05B 6/062 for cooking plates or the like

Abstract

An induction cooking system and method that prevents a valid key touch from being rejected is provided. A noise rejection apparatus can prevent noise from influencing the determination of a valid key touch.

Claims

1. An induction cooking system, comprising:

an induction heating coil disposed in a chassis of the induction cooking system;

an inverter coupled with said coil, wherein said inverter supplies energy to said coil;

a cooking utensil that is energized by said coil, wherein said cooking utensil produces an electromagnetic induced signal having noise when energized;

a user interface in communication with said coil and said inverter, wherein said user interface includes an input key to receive a first key touch;

a conductor that conducts the electromagnetic induced signal having noise between said energized cooking utensil and said user interface; and

a noise rejection apparatus that prevents rejection of a valid key touch signal, wherein said noise rejection apparatus includes;

a controller configured to determine the valid key touch, and

a feedback loop in communication with the controller,

wherein the controller compares a signal from the feedback loop and the first key touch to determine the valid key touch.

2. The induction cooking system, as in claim 1, wherein the first key touch includes a signal having a frequency, and the controller determines the valid key touch has been received when a frequency of the feedback loop signal is similar to the frequency of a first key touch signal.

3. The induction cooking system, as in claim 1, wherein the feedback loop communicates a signal having a first frequency and the first key touch is a signal including the electromagnetic induced signal having noise having a second frequency, and

the controller determines the valid key touch when the first frequency and the second frequency are within a predetermined range.

4. The induction cooking system, as in claim 1, wherein the feedback loop is at least one of a system controller feedback loop, an inverter feedback loop, and an induction feedback loop.

5. The induction cooking system, as in claim 1, wherein said user interface includes a capacitive touch sensitive display.

6. An induction cooking system, comprising:

an induction heating coil disposed in a chassis of the induction cooking system;

an inverter coupled to said coil;

wherein said inverter supplies energy to said coil;

a user interface in communication with said coil and said inverter, wherein said user interface includes an input key to receive a first key touch;

a glass surface adjacent to said induction heating coil or said user interface; and

a noise rejection apparatus that prevents rejection of a valid key touch signal, wherein said noise rejection apparatus includes a conductive material disposed on said glass surface.

7. The induction cooking system, as in claim 6, wherein said conductive material is in communication with the chassis.

8. The induction cooking system, as in claim 6, further comprising:

a conducting frame, wherein said user interface and said conductive material are coupled in said conducting frame, and

wherein said conductive material is disposed on said glass surface of said user interface.

9. The induction cooking system, as in claim 8, wherein said conducting frame is coupled to ground.

10. The induction cooking system, as in claim 6, further comprising:

a cooking utensil configured to be energized by said coil, wherein said cooking utensil produces an electromagnetic induced signal having noise when energized,

wherein said conductive material is disposed between said cooking utensil and said glass surface.

11. The induction cooking system, as in claim 10, wherein said conductive material is coupled to ground.

12. A method of determining a valid key touch in an induction cooking system, comprising:

supplying energy to an induction heating coil;

energizing the induction heating coil to generate an electromagnetic induced signal having noise;

conducting the electromagnetic induced signal having noise to a user interface;

detecting a first key touch including the electromagnetic induced signal having noise at the user interface; and

determining whether the first key touch is a valid key touch.

13. The method, as in claim 12, further comprising:

performing a predetermined function in response to the valid key touch.

14. The method, as in claim 12, wherein determining the valid key touch step includes:

receiving a feedback loop signal having a first frequency;

comparing the feedback loop signal having a first frequency with the first key touch including the electromagnetic induced signal having noise having a second frequency;

determining a valid key touch when the first frequency and the second frequency are similar.

15. The method, as in claim 14, wherein the feedback loop signal is from at least one of a system controller feedback loop, an inverter feedback look, and an induction feedback loop.

16. The method as in claim 12, wherein determining the valid key touch step includes:

receiving a feedback loop signal having a first frequency;

comparing the feedback loop signal having a first frequency with the first key touch including the electromagnetic induced signal having noise having a second frequency;

determining a valid key touch when the first frequency and the second frequency are within a predetermined range.

17. The method, as in claim 16, wherein the feedback loop signal is from at least one of a system controller feedback loop, an inverter feedback look, and an induction feedback loop.

18. The method, as in claim 12, wherein the user interface includes a capacitive touch sensitive display.