Induction heater

• US 8,426,781 B2
• Filed: 02/22/2008
• Issued: 04/23/2013
• Est. Priority Date: 02/24/2007
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Won Tae, Ryu, Seung Hee
• Primary Examiner(s): Yuen, Henry
• Assistant Examiner(s): Nguyen, Hung D
• Application Number:
  US12/528,207
• Publication Number:
  US 20100187222A1
• Time in Patent Office: 1,887 Days
• Field of Search: 219/632, 219/623, 219/677, 219/620, 219/622, 219/660, 126/21.R, 126/21.A, 126/1.AD, 99D/IG.14
• US Class Current: 219/623
• CPC Class Codes: H05B 2206/022 Special supports for the induction coils
• CPC Class Codes: H05B 6/1263 using coil cooling arrangements

Abstract

Provided is an induction heater which induces an electric current in a metal utensil (e.g., a cooking utensil) using an electromagnetic force and can thus heat the metal utensil, and more particularly, an induction heater which can prevent electric devices sensitive to temperature from being overheated by forcefully blowing air to the front and the rear of an inverter circuit board. The induction heater is easy to be miniaturized, and a considerable number of devices can be integrated into the induction heater.

Claims

1. An induction heater, comprising:

an inverter body having an inlet formed in a bottom surface thereof;

an inverter circuit board provided within the inverter body;

an inverter heat dissipater mounted in the inverter body and contacting the bottom surface of the inverter body such that an inlet of the inverter heat dissipater is connected to the inlet of the inverter body, wherein the inverter heat dissipater is configured to blow air to a front and a rear of the inverter circuit board, the inverter heat dissipater comprising;

an inverter heat dissipation blower configured to blow air into at least one of a first inverter heat dissipation space formed between the inverter body and the inverter circuit board or a second inverter heat dissipation space formed between the inverter body and the inverter circuit board; and

an inverter guide provided between the inverter body and the inverter circuit board and configured to guide air blown by the inverter heat dissipation blower to the inverter circuit board; and

a heat sink provided on a top surface of the inverter circuit board, wherein the heat sink dissipates heat from the inverter circuit board, and wherein an outlet divider divides an outlet of the inverter heat dissipation blower so that more air is blown into the first inverter heat dissipation space than into the second inverter heat dissipation space, and

wherein the inverter guide comprises a plurality of guide ribs each having an end portion thereof that is closest to the heat sink bent toward the heat sink.

2. The induction heater of claim 1, wherein the first inverter heat dissipation space is provided between a top surface of the inverter circuit board and the inverter body, and wherein the second inverter heat dissipation space is provided between a bottom surface of the inverter circuit board and the inverter body.

3. The induction heater of claim 2, wherein a first portion of an outlet of the inverter heat dissipation blower is configured to blow air into the first inverter heat dissipation space, and a second portion of the outlet of the inverter heat dissipation blower is configured to blow air into the second inverter heat dissipation space.

4. The induction heater of claim 3, wherein the outlet divider divides the outlet of the inverter heat dissipation blower into the first and second portions.

5. The induction heater of claim 2, wherein the inverter body comprises a plurality of outlets configured to guide air blown by the inverter heat dissipation blower out of the inverter body, the plurality of outlets comprising a first inverter body outlet configured to discharge air from the first inverter heat dissipation space and a second inverter body outlet configured to discharge air from the second inverter heat dissipation space.

6. The induction heater of claim 2, wherein the inverter body comprises an outlet configured to guide air blown by the inverter heat dissipation blower out of the inverter body, the outlet comprising a first portion configured to discharge air from the first inverter heat dissipation space and a second portion configured to discharge air from the second inverter heat dissipation space.

7. The induction heater of claim 2, wherein the inverter body has a substantially rectangular inner space, and the inverter heat dissipation blower is provided at a corner of the rectangular inner space of the inverter body.

8. The induction heater of claim 2, wherein the inverter body comprises:

an outlet provided on a side of the inverter body, wherein the inlet of the inverter body is configured to guide air blown by the inverter heat dissipation blower into the inverter body and the outlet of the inverter body is configured to guide air blown by the inverter heat dissipation blower to an outside of the inverter body.

9. The induction heater of claim 1, wherein the inverter guide is configured to support the inverter circuit board.

10. The induction heater of claim 1, wherein the inverter circuit board comprises both a first inverter circuit board and a second inverter circuit board provided within the inverter body, and the wherein the heat sink comprises:

a first heat sink provided on the first inverter circuit board and configured to dissipate heat from the first inverter circuit board; and

a second heat sink provided on the second inverter circuit board and configured to dissipate heat from the second inverter circuit board, the first and second heat sinks being provided in a space between the first inverter circuit board and the second inverter circuit board proximate each other.

11. The induction heater of claim 10, wherein the inverter heat dissipation blower comprises:

a first inverter heat dissipation blower configured to blow air to the first inverter circuit board, wherein the first inverter heat dissipation blower corresponds to the first heat sink; and

a second inverter heat dissipation blower configured to blow air to the second inverter circuit board, wherein the second inverter heat dissipation blower corresponds to the second heat sink.

12. The induction heater of claim 11, wherein the inverter guide comprises:

a first inverter guide configured to guide the air blown by the first inverter heat dissipation blower to the first inverter circuit board, but not to the first heat sink; and

a second inverter guide configured to guide the air blown by the second inverter heat dissipation blower to the second inverter circuit board, but not to the second heat sink.

13. The induction heater of claim 10, wherein the inverter heat dissipation blower is configured to blow air to the first and second inverter circuit boards, wherein the inverter heat dissipation blower corresponds to both the first and second heat sinks.

14. The induction heater of claim 1, further comprising one or more induction coils provided on the inverter body, wherein the induction coils generate an induction field.

15. An induction heater, comprising:

an inverter circuit board;

an inverter body which defines a space configured to receive the inverter circuit board, the inverter body having an inlet formed in a bottom surface thereof;

a heat sink provided on a top surface of the inverter circuit board, wherein the heat sink dissipates heat from the inverter circuit board, and wherein an outlet divider divides an outlet of an inverter heat dissipation blower so that more air is blown into a first inverter heat dissipation space than into a second inverter heat dissipation space, the first and second inverter heat dissipation spaces each being formed between the inverter circuit board and the inverter body; and

an inverter heat dissipater mounted in the inverter body and contacting the bottom surface of the inverter body such that an inlet of the inverter heat dissipater is connected to the inlet of the inverter body, wherein the inverter heat dissipater is configured to blow both a main air stream to a first portion of the inverter circuit board and a sub-air stream to a second portion of the inverter circuit board,

wherein the inverter heat dissipater includes an inverter guide provided between the inverter body and the inverter circuit board and configured to guide air blown by an inverter heat dissipation blower to the inverter circuit board, and

wherein the inverter guide comprises a plurality of guide ribs each having an end thereof that is closest to the heat sink bent toward the heat sink.

16. The induction heater of claim 15, wherein the first portion of the inverter circuit board comprises a front of the inverter circuit board, and the second portion of the inverter circuit board comprises a rear of the inverter circuit board.

17. The induction heater of claim 16, wherein the inverter heat dissipater is configured to support the inverter circuit board.