Induction heating device and method for controlling induction heating device

Patent metadata

Field	Value
Publication number	US-11540360-B2
Application number	US-201916556504-A
Country	US
Kind code	B2
Filing date	Aug 30, 2019
Priority date	Aug 30, 2018
Publication date	Dec 27, 2022
Grant date	Dec 27, 2022

Abstract

An induction heater device and a method for controlling an induction heating device are provided. The method may include determining a first target frequency of a first working coil corresponding to the drive command for the first working coil, determining a second target frequency of a second working coil corresponding to the drive command for the second working coil, and determining a final drive frequency of the first working coil and a final drive frequency of the second working coil based on the first target frequency and the second target frequency, respectively.

First claim

What is claimed is:

1. A method for controlling an induction heating device, the method comprising:
determining a first target frequency of a first working coil corresponding to the drive command for the first working coil;
determining a second target frequency of a second working coil corresponding to the drive command for the second working coil; and
determining a final drive frequency of the first working coil and a final drive frequency of the second working coil based on the first target frequency and the second target frequency, respectively, wherein the determining the final drive frequency of the first working coil and the final drive frequency of the second working coil based on the first target frequency and the second target frequency comprises:
calculating a difference value between the first target frequency and the second target frequency; and
determining the final drive frequency of the first working coil and the final drive frequency of the second working coil according to a comparison result between the difference value and a preset reference value.

2. The method according to claim 1 , further comprises:
receiving a drive command for the second working coil when the first working coil is being driven at the first target frequency; and
stopping driving of the first working coil, and driving the second working coil at a predetermined first adjustment frequency.

3. The method according to claim 1 , further comprises:
driving the first working coil at the final drive frequency of the first working coil continuously and driving the second working coil at the final drive frequency of the second working coil continuously.

4. The method according to claim 1 , wherein when the difference value is less than a first reference value, the final drive frequency of the first working coil and the final drive frequency of the second working coil are set to be equal to each other.

5. The method according to claim 1 , wherein when the difference value is less than a first reference value, the final drive frequency of the first working coil and the final drive frequency of the second working coil are set as any one among the first target frequency and the second target frequency.

6. The method according to claim 1 , wherein when the difference value is equal to or greater than a first reference value and less than a second reference value, a difference between the final drive frequency of the first working coil and the final drive frequency of the second working coil is set to correspond to a predetermined noise avoidance setting value.

7. The method according to claim 1 , wherein when the difference value is equal to or greater than a first reference value and less than a second reference value, a value obtained by increasing a larger value among the first target frequency and the second target frequency by a predetermined noise avoidance setting value and a smaller value among the first target frequency and the second target frequency are set as the final drive frequency of the first working coil and the final drive frequency of the second working coil, respectively.

8. The method according to claim 1 , wherein when the difference value is equal to or greater than a second reference value, the final drive frequency of the first working coil is set as the first target frequency, and the final drive frequency of the second working coil is set as the second target frequency.

9. The method according to claim 1 , further comprising:
driving the first working coil and the second working coil simultaneously at a second adjustment frequency; and
adjusting a drive frequency of the first working coil and a drive frequency of the second working coil to the final drive frequency of the first working coil and the final drive frequency of the second working coil, respectively.

10. An induction heating device, comprising:
a first working coil disposed to correspond to a first heating area;
a second working coil disposed to correspond to a second heating area; and
a control unit configured to adjust drive frequencies of the first working coil and the second working coil according to a drive command input by a user, wherein the control unit is configured to:
determine a first target frequency of the first working coil corresponding to the drive command for the first working coil;
determine a second target frequency of the second working coil corresponding to the drive command for the second working coil; and
determine a final drive frequency of the first working coil and a final drive frequency of the second working coil based on the first target frequency and the second target frequency, respectively, wherein the control unit is configured to:
calculate a difference value between the first target frequency and the second target frequency; and
determine the final drive frequency of the first working coil and the final drive frequency of the second working coil according to a comparison result between the difference value and a preset reference value.

11. The induction heating device according to claim 10 , wherein the control unit is further configured to:
receive a drive command for the second working coil when the first working coil is being driven at the first target frequency; and
stop driving of the first working coil, and drive the second working coil at a predetermined first adjustment frequency.

12. The induction heating device according to claim 10 , wherein the control unit is configured to:
drive the first working coil at the final drive frequency of the first working coil continuously and drive the second working coil at the final drive frequency of the second working continuously.

13. The induction heating device according to claim 10 , wherein when the difference value is less than a first reference value, the final drive frequency of the first working coil and the final drive frequency of the second working coil are set to be equal to each other.

14. The method according to claim 10 , wherein when the difference value is less than a first reference value, the final drive frequency of the first working coil and the final drive frequency of the second working coil are set as any one among the first target frequency and the second target frequency.

15. The method according to claim 10 , wherein when the difference value is equal to or greater than a first reference value and less than a second reference value, a difference between the final drive frequency of the first working coil and the final drive frequency of the second working coil is set to correspond to a predetermined noise avoidance setting value.

16. The method according to claim 10 , wherein when the difference value is equal to or greater than the first reference value and less than the second reference value, a value obtained by increasing a larger value among the first target frequency and the second target frequency by a predetermined noise avoidance setting value and a smaller value among the first target frequency and the second target frequency are set as the final drive frequency of the first working coil and the final drive frequency of the second working coil, respectively.

17. The method according to claim 10 , wherein when the difference value is equal to or greater than a second reference value, the final drive frequency of the first working coil is set as the first target frequency, and the final drive frequency of the second working coil is set as the second target frequency.

18. The method according to claim 10 , wherein the control unit is further configured to:

Assignees

• Lg Electronics Inc

Inventors

• Park Wongyu
• Kim Gwangrok
• Yoon Bada

Classifications

• H05B6/062 Primary

  for cooking plates or the like · CPC title

• H05B6/1209

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

• H05B6/1272

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

• H05B6/065 Primary

  using coordinated control of multiple induction coils · CPC title

• H05B6/08

  using compensating or balancing arrangements · CPC title