INDUCTION HEATING COOKER

• US 20120248095A1
• Filed: 03/23/2012
• Published: 10/04/2012
• Est. Priority Date: 03/28/2011
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Lee, Sung Ho, Shon, Jong Chull, Jung, Min Gyu, Kim, Ha Na
• Granted Patent: US 9,277,598 B2
• Time in Patent Office: Days
• US Class Current: 219/620
• CPC Class Codes: H05B 2206/022 Special supports for the induction coils
• CPC Class Codes: H05B 2213/03 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 Class Codes: H05B 6/1263 using coil cooling arrangements
• CPC Class Codes: H05B 6/1272 with more than one coil or coil segment per heating zone
• CPC Class Codes: Y02B 40/00 Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers

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.

Claims

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; 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.

2. The induction heating cooker of claim 1, wherein the high frequency circuit part is disposed on a left edge of the PCB and on a right edge of the PCB, and the low frequency circuit part is disposed between the high frequency circuit parts.

3. The induction heating cooker of claim 2, wherein a heat radiation plate is placed on the PCB to absorb heat generated from the circuit, characterized by high frequency, placed on the high frequency circuit part, and to dissipate the absorbed heat to outside;

and the high frequency circuit part is separated from the low frequency circuit part by the heat radiation plate.

4. 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.

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

6. The induction heating cooker of claim 4, wherein the plurality of subsidiary control circuits are placed on the high frequency circuit part of the PCB.

7. The induction heating cooker of claim 4, wherein the rectifier circuit comprises a diode bridge.

8. The induction heating cooker of claim 4, 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).

9. The induction heating cooker of claim 1, wherein a wire connecting part used to connect a wire is installed on a left end portion or a right end portion of the PCB, the wire configured to connect each of the heating coils to the corresponding circuit characterized by high frequency.

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

11. 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.

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

13. 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 detection parts configured to detect a value of electric current flowing through each of the heating coils; and

a control part configured to detect a heating coil of the heating coils on which the vessel is placed, according to the value of electric current detected through the detection part, wherein the heating coil is provided in a D shape that extends laterally.

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

15. 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.

16. The induction heating cooker of claim 15, wherein if a value of electric current flowing through the heating coil exceeds a critical value, the control part determines the heating coil as a heating coil having the vessel placed thereon.

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

18. The induction heating cooker of claim 13, wherein the plurality of heating coils comprise first through eighth heating coils, the eight heating coils being arranged in first through third columns.

19. The induction heating cooker of claim 18, wherein the first through third heating coils are disposed on the first column such that the 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 the 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 the curved line portion of each of the sixth through eighth heating coils faces a right edge of the cooking plate.