Induction heating cooker

Patent metadata

Field	Value
Publication number	US-9277598-B2
Application number	US-201213428053-A
Country	US
Kind code	B2
Filing date	Mar 23, 2012
Priority date	Mar 28, 2011
Publication date	Mar 1, 2016
Grant date	Mar 1, 2016

Abstract

An induction heating cooker including a cooking plate on which a cooking vessel is placed, a plurality of heating coils disposed while being adjacent to one other below the cooking plate, and a Printed Circuit Board (PCB) on which circuits configured to drive the heating coils are placed, wherein the PCB is divided into a high frequency circuit part on which circuits characterized by high frequency are placed and a low frequency circuit part on which circuits characterized by low frequency are placed, and the high frequency circuit part is spaced apart from the low frequency circuit part by a predetermined distance. The interference between the high frequency circuit part and the low frequency circuit part is minimized while enhancing the operation efficiency of each heating coil. The assembly efficiency and the working efficiency are enhanced when an inverter circuit is wired to a corresponding heating coil.

First claim

What is claimed is:

1. An induction heating cooker comprising:
a cooking plate on which a cooking vessel is placed;
a plurality of heating coils disposed while being adjacent to one other below the cooking plate; a Printed Circuit Board (PCB) on which circuits configured to drive the heating coils are placed; and
a heat radiation plate placed on the PCB, to absorb heat generated from the circuit and to dissipate the absorbed heat to outside,
wherein the PCB is divided into a high frequency circuit part on which circuits characterized by high frequency are placed and a low frequency circuit part on which circuits characterized by low frequency are placed, and the high frequency circuit part is separated from the low frequency circuit part by the heat radiation plate.

2. The induction heating cooker of claim 1 , wherein a first high frequency circuit part is disposed on a left edge of the PCB and a second high frequency circuit part is disposed on a right edge of the PCB, and the low frequency circuit part is disposed on the PCB between the first and second high frequency circuit parts, and
wherein the low frequency circuit part is separated from the first high frequency circuit part by a first heat radiation plate and from the second high frequency circuit part by a second heat radiation plate.

3. The induction heating cooker of claim 1 , wherein the circuits configured to drive the heating coils comprise:
a plurality of rectifier circuits configured to perform rectification on an input alternating current (AC) power source to output a rectified ripple voltage;
a plurality of inverter circuits configured to supply a high frequency power source to the heating coils; and
a plurality of subsidiary control circuits configured to control an operation of the heating coils.

4. The induction heating cooker of claim 3 , wherein the plurality of rectifier circuits and the plurality of inverter circuits are placed on the high frequency circuit part of the PCB.

5. The induction heating cooker of claim 3 , wherein the plurality of subsidiary control circuits are placed on the low frequency circuit part of the PCB.

6. The induction heating cooker of claim 3 , wherein the rectifier circuit comprises a diode bridge.

7. The induction heating cooker of claim 3 , wherein the inverter circuit comprises a switching device, which is configured to supply a resonance voltage to the heating coil according to a switching control signal of the subsidiary control circuit, and a resonance condenser which is connected in parallel to the heating coil and achieves a continuous resonance in cooperation with the heating coil by an input voltage, wherein the switching device comprises an Insulted Gate Bipolar Transistor (IGBT).

8. The induction heating cooker of claim 1 , wherein respective wire connecting parts are installed on the left edge of the PCB and the right edge of the PCB, each wire connecting part being configured to connect a wire, for driving current to a corresponding heating coil, to a corresponding one of the first high frequency circuit part and the second high frequency circuit part.

9. The induction heating cooker of claim 1 , wherein the heating coil is provided in a shape of a D that extends laterally.

10. The induction heating cooker of claim 1 , wherein a periphery of the heating coil comprises a straight line portion and an arched line portion having a parabola shape.

11. The induction heating cooker of claim 10 , wherein the arched line portion having the parabola shape is disposed facing a peripheral part of the cooking plate.

12. An induction heating cooker comprising:
a cooking plate on which a vessel is placed;
a plurality of heating coils disposed below the cooking plate while being adjacent to one another;
a plurality of magnets disposed below each of the plurality of heating coils and to increase an inductance of the heating coils;
a plurality of detection parts configured to detect a value of electric current flowing through each of the heating coils; and
a control part configured to determine whether a vessel is placed on a heating coil of the heating coils based on a corresponding one of the detected values,
wherein the heating coil is provided in a D shape that extends laterally.

13. The induction heating cooker of claim 12 , wherein a periphery of the heating coil comprises a straight line portion and an arched line portion having a parabola shape.

14. The induction heating cooker of claim 13 , wherein the arched line portion having the parabola shape is disposed facing a peripheral part of the cooking plate.

15. The induction heating cooker of claim 14 , wherein the control part determines that the vessel is placed on the heating coil based on whether the corresponding one value meets a threshold.

16. The induction heating cooker of claim 15 , wherein the threshold represents a value of electric current flowing through the heating coil when a vessel formed using magnetic material occupies a predetermined critical ratio of an area of the heating coil.

17. The induction heating cooker of claim 12 , wherein the plurality of heating coils, including the heating coil and the respectively adjacent different heating coils, comprise first through eighth heating coils, the eight heating coils being arranged in first through third columns.

18. The induction heating cooker of claim 17 , wherein the first through third heating coils are disposed on the first column such that a curved line portion of each of the first through third heating coils faces a left edge of the cooking plate,
the fourth and fifth heating coils are disposed on the second column such that a curved line portion of the fourth and fifth heating coils faces an upper edge and a lower edge of the cooking plate, respectively, and
the sixth through eighth heating coils are disposed on the third column such that a curved line portion of each of the sixth through eighth heating coils faces a right edge of the cooking plate.

Assignees

• Lee Sung Ho
• Shon Jong Chull
• Jung Min Gyu
• Kim Ha Na
• Samsung Electronics Co Ltd

Inventors

• Lee Sung Ho
• Shon Jong Chull
• Jung Min Gyu
• Kim Ha Na

Classifications

• H05B6/1263 Primary

  using coil cooling arrangements · CPC title

• H05B2206/022

  Special supports for the induction coils · CPC title

• H05B6/1272

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

• H05B2213/03

  Heating plates made out of a matrix of heating elements that can define heating areas adapted to cookware randomly placed on the heating plate · CPC title

• Y02B40/126

  Cross-Sectional Technologies · mapped topic