Induction heating device

Patent metadata

Field	Value
Publication number	US-11166347-B2
Application number	US-201716308170-A
Country	US
Kind code	B2
Filing date	May 31, 2017
Priority date	Jun 7, 2016
Publication date	Nov 2, 2021
Grant date	Nov 2, 2021

Abstract

An induction heating device includes a first coil that is wound about an axis by a first number of rotations, a second coil that is spaced apart from the first coil in a radial direction and that is disposed radially outward of the first coil, the second coil being wound about the axis by a second number of rotations, and a power supply unit configured to convert alternating current (AC) power and to supply a high-frequency AC to the first coil and to the second coil based on conversion of the AC power. The induction heating device is configured to output a maximum output level in a range from 6500 W to 7500 W based on a ratio between the first number of rotations and the second number of rotations.

First claim

The invention claimed is:

1. An induction heating device comprising:
a first coil that is wound about an axis by a first number of rotations;
a second coil that is spaced apart from the first coil in a radial direction and that is disposed radially outward of the first coil, the second coil being wound about the axis by a second number of rotations;
a coil base configured to seat the first coil and the second coil; and
a power supply unit configured to convert alternating current (AC) power and to supply a high-frequency AC to the first coil and to the second coil based on conversion of the AC power,
wherein the induction heating device is configured to output a maximum output level in a range from 6500 W to 7500 W based on a ratio between the first number of rotations and the second number of rotations, and
wherein the coil base comprises:
a first base configured to seat the first coil,
a second base spaced apart from the first base in the radial direction and disposed radially outward of the first base, the second base being configured to seat the second coil, and
one or more connection portions that extend from the first base to the second base in the radial direction.

2. The induction heating device of claim 1 , wherein the ratio between the first number of rotations and the second number of rotations is in a range from 1.5 to 1.7.

3. The induction heating device of claim 1 , wherein the maximum output level of the induction heating device is in a range from 7000 W to 7500 W.

4. The induction heating device of claim 3 , wherein the ratio between the first number of rotations and the second number of rotations is any one of 18:11, 17:11, or 16:10.

5. The induction heating device of claim 1 , wherein an output frequency of the high-frequency AC is in a range from 25 kHz to 35 kHz.

6. The induction heating device of claim 1 , further comprising:
one or more first shielding sheets disposed at a lower portion of the first coil and configured to restrict transmission of an electromagnetic wave; and
one or more second shielding sheets disposed at a lower portion of the second coil and configured to restrict transmission of an electromagnetic wave.

7. The induction heating device of claim 1 , wherein the induction heating device is configured to output the maximum output level based on the ratio between the first number of rotations and the second number of rotations being equal to 17:11.

8. An induction heating device comprising:
an induction assembly comprising:
a first coil that is wound about an axis by a first number of rotations, and
a second coil that is spaced apart from the first coil in a radial direction and that is disposed radially outward of the first coil, the second coil being wound about the axis by a second number of rotations;

an interface unit configured to adjust an output of the induction assembly;
a coil base configured to seat the first coil and the second coil; and
a power supply unit configured to supply power to the induction assembly and to the interface unit,
wherein the induction heating device is configured to output a maximum output level in a range from 6500 W to 7500 W based on a ratio between the first number of rotations and the second number of rotations, and
wherein the coil base comprises:
a first base configured to seat the first coil,
a second base spaced apart from the first base in the radial direction and disposed radially outward of the first base, the second base being configured to seat the second coil, and
one or more connection portions that extend from the first base to the second base in the radial direction.

9. The induction heating device of claim 8 , wherein the ratio between the first number of rotations and the second number of rotations is in a range from 1.5 to 1.7.

10. The induction heating device of claim 8 , wherein the maximum output level the induction heating device is in a range from 7000 W to 7500 W.

11. The induction heating device of claim 8 , wherein the ratio between the first number of rotations and the second number of rotations is any one of 18:11, 17:11, or 16:10.

12. The induction heating device of claim 8 , wherein the power supply unit is configured to supply a high-frequency alternating current (AC) to the first coil and to the second coil, and
wherein an output frequency of the high-frequency AC is in a range from 25 kHz to 35 kHz.

13. The induction heating device of claim 8 , wherein the induction heating device is configured to output the maximum output level based on the ratio between the first number of rotations and the second number of rotations being equal to 17:11.

14. The induction heating device of claim 8 , wherein the power supply unit is configured to supply power to both the first coil and the second coil based on the interface unit receiving a user input indicating an adjustment of the output of the induction heating device to the maximum output level.

15. The induction heating device of claim 1 , wherein the second coil is spaced apart from the first coil by a predetermined distance in the radial direction.

16. The induction heating device of claim 1 , wherein the first coil and the second coil are coplanar.

17. The induction heating device of claim 1 , wherein the coil base includes:
an upper surface configured to seat the first coil and the second coil; and
a lower surface configured to seat one or more shielding sheets that are configured to restrict transmission of an electromagnetic wave through the coil base.

18. The induction heating device of claim 17 , wherein the coil base defines one or more accommodating portions that are recessed from the lower surface of the coil base, that are arranged about the axis, and that are configured to receive the one or more shielding sheets, respectively.

19. The induction heating device of claim 8 , wherein the coil base includes:
an upper surface configured to seat the first coil and the second coil; and
a lower surface configured to seat one or more shielding sheets that are configured to restrict transmission of an electromagnetic wave through the coil base.

20. The induction heating device of claim 19 , wherein the coil base defines one or more accommodating portions that are recessed from the lower surface of the coil base, that are arranged about the axis, and that are configured to receive the one or more shielding sheets, respectively.

Assignees

• Lg Electronics Inc

Inventors

• Oh Dooyong
• Park Byeong Wook

Classifications

• H05B6/062 Primary

  for cooking plates or the like · CPC title

• H05B6/44

  having more than one coil or coil segment · CPC title

• H05B6/129

  induction ovens · CPC title

• Y02B40/00

  Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers · CPC title

• H05B6/1281

  with flat coils · CPC title