Wireless induction heating cooker having improved cooking uniformity

Patent metadata

Field	Value
Publication number	US-11730300-B2
Application number	US-202016903981-A
Country	US
Kind code	B2
Filing date	Jun 17, 2020
Priority date	Dec 18, 2019
Publication date	Aug 22, 2023
Grant date	Aug 22, 2023

Abstract

A wireless induction heating cooker is configured to operate on an induction heating apparatus. The wireless induction heating cooker includes a main body, an internal pot configured to be disposed in the main body, a plurality of receiving coils disposed at a bottom surface of the main body and arranged along a circumferential direction of the internal pot, and a plurality of lateral surface heating coils spaced apart from the bottom surface of the main body and arranged along a lateral surface of the internal pot. Each of the plurality of lateral surface heating coils is connected to one of the plurality of receiving coils that is disposed at an opposite side with respect to a reference line passing through the bottom surface of the main body.

First claim

What is claimed is:

1. A wireless induction heating cooker configured to operate on an induction heating apparatus, the wireless induction heating cooker comprising:
a main body;
an internal pot configured to be disposed in the main body;
a plurality of receiving coils disposed at a bottom surface of the main body and arranged along a circumferential direction of the internal pot; and
a plurality of lateral surface heating coils spaced apart from one another and arranged along a lateral surface of the internal pot, each of the plurality of lateral surface heating coils being connected to one of the plurality of receiving coils that is disposed at an opposite side across a reference line passing through the bottom surface of the main body.

2. The wireless induction heating cooker of claim 1 , wherein the plurality of receiving coils comprise a first receiving coil and a second receiving coil, and
wherein the plurality of lateral surface heating coils comprise:
a first lateral surface heating coil connected to the first receiving coil and disposed at an opposite side of the first receiving coil with respect to the reference line, and
a second lateral surface heating coil connected to the second receiving coil and disposed at an opposite side of the second receiving coil with respect to the reference line.

3. The wireless induction heating cooker of claim 1 , wherein the plurality of receiving coils are configured to induce electric currents based on a magnetic field being generated in a working coil of the induction heating apparatus.

4. The wireless induction heating cooker of claim 1 , wherein each of the plurality of receiving coils is configured to supply induced electric current to a corresponding heating coil among the plurality of lateral surface heating coils, and
wherein the plurality of lateral surface heating coils are configured to heat the lateral surface of the internal pot based on the induced electric current.

5. The wireless induction heating cooker of claim 1 , further comprising a metallic plate disposed on the lateral surface of the internal pot and configured to be heated by a magnetic field generated in the plurality of receiving coils and by the plurality of lateral surface heating coils.

6. The wireless induction heating cooker of claim 1 , further comprising a resonance capacitor that connects one of the plurality of receiving coils to one of the plurality of lateral surface heating coils.

7. The wireless induction heating cooker of claim 1 , wherein centers of the plurality of receiving coils are arranged on the bottom surface of the main body along the circumferential direction of the internal pot, and
wherein centers of the plurality of lateral surface heating coils are disposed in a plane parallel to the bottom surface of the main body and are arranged along the circumferential direction of the internal pot.

8. The wireless induction heating cooker of claim 7 , wherein vertical distances between the bottom surface of the main body and the centers of the plurality of lateral surface heating coils are equal to one another.

9. The wireless induction heating cooker of claim 1 , wherein the reference line is a vertical line through a center of the internal pot,
wherein radial distances from the vertical line to centers of the plurality of receiving coils are equal to one another, and
wherein radial distances from the vertical line to centers of the plurality of lateral surface heating coils are equal to one another.

10. The wireless induction heating cooker of claim 1 , wherein the plurality of receiving coils are arranged on the bottom surface of the main body that faces a working coil of the induction heating apparatus.

11. The wireless induction heating cooker of claim 1 , wherein the internal pot comprises a round portion that extends upward from a bottom surface of the internal pot, the round portion having:
a lower end that is connected to the bottom surface of the internal pot and that defines a first radius of the internal pot; and
an upper end that is disposed vertically above the lower end and that defines a second radius of the internal pot that is different from the first radius, and
wherein the plurality of receiving coils are disposed radially outside the lower end of the round portion.

12. The wireless induction heating cooker of claim 1 , wherein the internal pot comprises a round portion that defines a first radius of the internal pot and a second radius of the internal pot, and
wherein the plurality of receiving coils face a lower part of the round portion of the internal pot.

13. The wireless induction heating cooker of claim 12 , wherein the second radius of the internal pot is greater than the first radius of the internal pot, and
wherein a distance between the reference line and an outer edge of each of the plurality of receiving coils is greater than the second radius of the internal pot.

14. The wireless induction heating cooker of claim 1 , wherein a center of one of the plurality of receiving coils and a center of one of the plurality of lateral surface heating coils connected to the one of the plurality of receiving coils are disposed on a line that crosses the reference line.

15. The wireless induction heating cooker of claim 1 , wherein the plurality of lateral surface heating coils are vertically arranged on the lateral surface of the internal pot.

16. The wireless induction heating cooker of claim 1 , wherein each of the plurality of lateral surface heating coils is disposed on a plane that is inclined with respect to the bottom surface of the main body,
wherein each of the plurality of lateral surface heating coils has a lower edge facing the bottom surface of the main body and an upper edge disposed vertically above the lower edge, and
wherein a radial distance between the reference line and the lower edge is less than a radial distance between the reference line and the upper edge.

17. The wireless induction heating cooker of claim 1 , wherein the plurality of lateral surface heating coils are disposed concavely along a round portion of the internal pot.

18. The wireless induction heating cooker of claim 1 , wherein the reference line is a vertical line through a center of the internal pot,
wherein central angles defined about the vertical line between two adjacent receiving coils among the plurality of receiving coils are equal to one another, and
wherein central angles defined about the vertical line between two adjacent lateral surface heating coils among the plurality of lateral surface heating coils are equal to one another.

19. The wireless induction heating cooker of claim 1 , wherein the plurality of receiving coils are arranged symmetrically with respect to the reference line, and
wherein the plurality of lateral surface heating coils are arranged symmetrically with respect to the reference line.

20. The wireless induction heating cooker of claim 1 , wherein each of the plurality of receiving coils has a flat shape parallel to the bottom surface of the main body, and
wherein each of the plurality of lateral surface heating coils has a convex shape that protrudes outward relative to the lateral surface of the internal pot.

Assignees

• Lg Electronics Inc

Inventors

• Nam Hyeunsik
• Kim Wan Soo
• Park Byungkyu

Classifications

• A47J27/004 Primary

  with integral electrical heating means (drinking cups with integral heating means A47J36/2466) · CPC title

• A47J36/16

  Inserts · CPC title

• H02J50/10

  using inductive coupling · CPC title

• 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

• H05B6/1245

  with special coil arrangements · CPC title