Induction heating device and method of controlling the same

Patent metadata

Field	Value
Publication number	US-12144086-B2
Application number	US-201917271823-A
Country	US
Kind code	B2
Filing date	Aug 30, 2019
Priority date	Aug 30, 2018
Publication date	Nov 12, 2024
Grant date	Nov 12, 2024

Abstract

According to an embodiment, a method of controlling an induction heating device comprises determining a first target frequency of a first working coil corresponding to a driving command for the first working coil, determining a second target frequency of a second working coil corresponding to a driving command for the second working coil, determining a final driving frequency of the first working coil and a final driving frequency of the second working coil based on the first target frequency and the second target frequency, determining output control methods of the first working coil and the second working coil based on the first target frequency, the second target frequency, the final driving frequency of the first working coil, and the final driving frequency of the second working coil, and driving the first working coil and the second working coil at the final driving frequencies according to the output control methods.

First claim

The invention claimed is:

1. A method of controlling an induction heating device, the method comprising:
determining a first target frequency of a first working coil corresponding to a driving command for the first working coil;
receiving a driving command for a second working coil when the first working coil is driven at the first target frequency;
stopping driving of the first working coil and determining a second target frequency of the second working coil corresponding to the driving command for the second working coil;
determining a final driving frequency of the first working coil and a final driving frequency of the second working coil based on the first target frequency and the second target frequency;
determining output control methods of the first working coil and the second working coil based on the first target frequency, the second target frequency, the final driving frequency of the first working coil, and the final driving frequency of the second working coil; and
driving the first working coil and the second working coil at the final driving frequencies according to the determined output control methods.

2. The method of claim 1 , wherein the determining the first target frequency of the first working coil includes:
driving the first working coil at a predetermined first adjustment frequency,
reducing a driving frequency of the first working coil from the predetermined first adjustment frequency, and
determining that the first target frequency is a driving frequency when an output power value of the first working coil matches a required power value corresponding to the driving command for the first working coil.

3. The method of claim 1 , wherein the stopping driving the first working coil and the determining the second target frequency of the second working coil includes:
driving the second working coil at a predetermined first adjustment frequency,
reducing a driving frequency of the second working coil from the predetermined first adjustment frequency, and
determining that the second target frequency is a driving frequency when an output power value of the second working coil matches a required power value corresponding to the driving command for the second working coil.

4. The method of claim 1 , wherein the determining the final driving frequency of the first working coil and the final driving frequency of the second working coil includes:
determining a difference between the first target frequency and the second target frequency and determining the final driving frequency of the first working coil and the final driving frequency of the second working coil according to a result of comparison between the difference and a predetermined reference value.

5. The method of claim 4 , wherein when the difference is not less than a predetermined first reference value and less than a predetermined second reference value, the final driving frequency of the first working coil and the final driving frequency of the second working coil are set to be identical to each other.

6. The method of claim 5 , wherein the final driving frequency of the first working coil and the final driving frequency of the second working coil are set to larger value among the first target frequency and the second target frequency, or a smaller value among the first target frequency and the second target frequency.

7. The method of claim 4 , wherein when the difference is not less than a predetermined second reference value and less than a predetermined third reference value, the final driving frequency of the first working coil and the final driving frequency of the second working coil are set to have a difference not less than a predetermined noise avoidance set value.

8. The method of claim 7 , wherein the final driving frequency of the first working coil and the final driving frequency of the second working coil are set to a value resulting from increasing a larger value among the first target frequency and the second target frequency to a predetermined noise avoidance set value and a smaller value among the first target frequency and the second target frequency.

9. The method of claim 4 , wherein when the difference is less than a predetermined first reference value or not less than a predetermined third reference value, the final driving frequency of the first working coil is set to the first target frequency, and the final driving frequency of the second working coil is set to the second target frequency.

10. The method of claim 1 , wherein the determining the output control methods of the first working coil and the second working coil includes:
setting an output control method of a working coil whose final driving frequency is smaller than a target frequency to a duty control method, and
setting an output control method of a working coil whose final driving frequency is the same as a target frequency to a linear control method.

11. An induction heating device, comprising:
a first working coil corresponding to a first heating area;
a second working coil corresponding to a second heating area; and
a controller configured to determine a driving frequency of the first working coil or the second working coil when a driving command for the first working coil or a driving command for the second working coil is input to drive the first working coil or the second working coil, wherein the controller is configured to:
determine a first target frequency of the first working coil corresponding to the driving command for the first working coil,
receive a driving command for the second working coil when the first working coil is driven at the first target frequency,
stop driving the first working coil and determine a second target frequency of the second working coil corresponding to the driving command for the second working coil,
determine a final driving frequency of the first working coil and a final driving frequency of the second working coil based on the first target frequency and the second target frequency,
determine output control methods of the first working coil and the second working coil based on the first target frequency, the second target frequency, the final driving frequency of the first working coil, and the final driving frequency of the second working coil, and
drive the first working coil and the second working coil at the final driving frequencies according to the determined output control methods.

12. The induction heating device of claim 11 , wherein the controller is configured to drive the first working coil at a predetermined first adjustment frequency, reduce a driving frequency of the first working coil from the predetermined first adjustment frequency, and determine that the first target frequency is a driving frequency when an output power value of the first working coil matches a required power value corresponding to the driving command for the first working coil.

13. The induction heating device of claim 11 , wherein the controller is configured to:
drive the second working coil at a predetermined first adjustment frequency,
reduce a driving frequency of the second working coil from the predetermined first adjustment frequency, and
determine that the second target frequency is a driving frequency when an output power value of the second working coil matches a required power value corresponding to the driving command for the second working coil.

14. The induction heating device of claim 11 , wherein the controller is configured to determine a difference between the first target frequency and the second target frequency and determine the final driving frequency of the first working coil and the fina

Assignees

• Lg Electronics Inc

Inventors

• Yoon Bada
• Kim Gwang Rok
• Park Wongyu

Classifications

• H05B6/1236

  adapted to induce current in a coil to supply power to a device and electrical heating devices powered in this way · CPC title

• H05B6/1272

  with more than one coil or coil segment per heating zone · CPC title

• H05B6/1209

  induction cooking plates or the like and devices to be used in combination with them · CPC title

• H05B6/065 Primary

  using coordinated control of multiple induction coils · CPC title

• H05B6/062 Primary

  for cooking plates or the like · CPC title