KR-102961265-B1 - INDUCTION HEATING TYPE COOKTOP HAVING IMPROVED USABILITY

KR102961265B1KR 102961265 B1KR102961265 B1KR 102961265B1KR-102961265-B1

Abstract

The present invention relates to an induction heating cooktop with improved ease of use. In addition, an induction heating cooktop according to one embodiment of the present invention comprises a case, a cover plate coupled to the top of the case and having a top plate portion on which an object to be heated is placed on the top surface, a working coil provided inside the case to heat the object to be heated, and a thin film disposed on a plane intersecting the magnetic field of the working coil.

Inventors

김원태
전현우
양재경
손승호
이용수

Assignees

엘지전자 주식회사

Dates

Publication Date: 20260508
Application Date: 20240131

Claims (16)

case; A cover plate coupled to the top of the above case and having a top plate portion on which an object to be heated is placed on the top surface; A working coil provided inside the above case and generating a magnetic field; and It includes a thin film disposed on a plane intersecting the magnetic field of the above-mentioned working coil, and The above working coil is, In order to heat the object to be heated, at least one of the object to be heated and the thin film is inductively heated, and The above thin film is formed in at least one ring shape. Induction heating cooktop.
In Article 1, The above thin film is, Arranged to overlap the above working coil in the vertical direction, Induction heating cooktop.
In Article 1, The above thin film forms a closed circuit on the above plane, Induction heating cooktop.
In Article 1, The above magnetic field is, Forming a closed circuit, Passing through the above thin film and reaching the above heated object, Induction heating cooktop.
In Article 1 or Article 4, When the above-mentioned heated object is a magnetic material, The above magnetic field passes through the thin film and is exhausted from the object to be heated, thereby inductively heating the object to be heated, and When the above-mentioned heated object is a non-magnetic material, The above magnetic field is exhausted in the thin film, thereby inducing heating of the thin film. Induction heating cooktop.
In Article 1, The above thin film is coated on the upper or lower surface of the upper plate portion, Induction heating cooktop.
In Article 1, The thickness of the above thin film is, Thinner than the skin depth of the above thin film, Induction heating cooktop.
In Article 1 or Article 7, The thickness of the above thin film is, Formed to have a resistance value that can be heated by the above-mentioned working coil, Induction heating cooktop.
In Article 1, The above-mentioned heated object and the above-mentioned thin film form an equivalent circuit, and The resistance component and inductor component of the above-mentioned heated object and Depending on the difference in magnitude between the resistance and inductor components of the above thin film, An eddy current is applied to at least one of the above-mentioned heated object and the above-mentioned thin film, Induction heating cooktop.
In Article 1, A shielding plate mounted on the lower surface of the above-mentioned working coil to block the magnetic field generated downward when the above-mentioned working coil is driven; A support member installed between the lower surface of the shielding plate and the lower surface of the case to support the shielding plate upward; and A cooling fan further comprising a cooling fan installed inside the case to cool the working coil. Induction heating cooktop.
In Article 1, It further includes an insulating material disposed between the above thin film and the above working coil, The above insulation material is, Overlapping in the vertical direction with the above thin film and the above working coil, Induction heating cooktop.
In Article 1, The above working coil is provided in multiple numbers, and The above thin film and the plurality of working coils are superimposed in the vertical direction, The above-mentioned heated object is, At least one of the plurality of working coils provided, which is simultaneously heated by a position that overlaps in the vertical direction with the area where the object to be heated is placed on the upper plate, Induction heating cooktop.
In Article 1 or Article 12, The above thin film is provided in multiple numbers, and The above-mentioned plurality of thin films have a shape in which a plurality of rings of different diameters are repeated. Induction heating cooktop.
In Article 1, The value of the eddy current applied to the above thin film is greater than 0, Induction heating cooktop.
In Article 1, The above upper plate is, The plane on which the above thin film is placed is parallel, Induction heating cooktop.
In Article 1, The above thin film is, Composed of conductive material, Induction heating cooktop.

Description

Induction heating type cooktop with improved ease of use The present invention relates to an induction heating cooktop with improved ease of use. Various types of cooking appliances are used to heat food in homes and restaurants. Traditionally, gas ranges using gas as fuel have been widely used; however, recently, devices that heat objects using electricity instead of gas—such as cooking vessels like pots—are becoming more popular. Methods of heating an object using electricity are broadly divided into resistance heating and induction heating. The electric resistance method heats an object by transferring heat generated when an electric current is passed through a metal resistance wire or a non-metallic heating element, such as silicon carbide, to the object (e.g., a cooking vessel) through radiation or conduction. The induction heating method, on the other hand, is a method in which an eddy current is generated in an object made of metal components by utilizing the magnetic field generated around a coil when high-frequency power of a predetermined magnitude is applied to the coil, thereby heating the object itself. Recently, induction heating methods are mostly applied to cooktops. However, in the case of a cooktop with an induction heating method, there is a limitation that it can only heat magnetic materials. That is, if a non-magnetic material (e.g., heat-resistant glass, ceramics, etc.) is placed on the cooktop, there is a problem that the cooktop with an induction heating method cannot heat the object to be heated. Accordingly, in order to overcome the limitations of conventional induction heating cooktops, various methods as follows have been devised. First, a method was devised to add a heating plate capable of heating by induction heating between a cooktop and a non-magnetic material. Referring to Japanese Registered Patent Publication No. 5630495 (October 17, 2014), a method of induction heating by adding a heating plate is disclosed. However, this method had the problem that not only was heating efficiency reduced, but the time required to boil water also increased significantly compared to conventional methods. More specifically, this method is characterized by forming a chimney hole in the heating plate; when the cooking vessel is made of magnetic material, the vessel is heated by electromagnetic induction using magnetic field lines passing through the chimney hole, and the heating plate is also heated by electromagnetic induction using a heating coil, which resulted in problems such as reduced heating efficiency. In another way, a hybrid cooktop has been devised that heats a non-magnetic material through a radiant heater with an electric resistance method and heats a magnetic material through a working coil with an induction heating method. The configuration of a hybrid cooktop is disclosed by referring to Japanese Patent Publication No. 2008-311058 (December 25, 2008). However, this method had the problem of low radiant heater output and poor heating efficiency, and there was the inconvenience that the user had to consider the material of the object to be heated when placing it in the heating area. Finally, an all-metal cooktop capable of heating all metal objects (i.e., non-magnetic metals and magnetic materials) has been devised. Refer to U.S. Patent Publication No. 6,770,857 (August 3, 2004), which discloses the configuration of an all-metal cooktop. However, this method had the problem of being unable to heat non-magnetic, non-metallic objects. Additionally, when heating non-magnetic, metallic objects, there was also the issue of lower heating efficiency and higher material costs compared to radiant heater technology. Accordingly, there is a growing need to develop new technologies that can overcome the limitations of induction heating cooktops. FIG. 1 is a drawing illustrating an induction heating type cooktop according to one embodiment of the present invention. Figure 2 is a drawing illustrating the components provided inside the case of the induction heating type cooktop shown in Figure 1. Figures 3 and 4 are diagrams illustrating the relationship between the thickness of a thin film and the skin depth. Figures 5 and 6 are diagrams illustrating the change in impedance between a thin film and a heated object depending on the type of heated object. FIG. 7 is a drawing illustrating an induction heating type cooktop according to another embodiment of the present invention. FIG. 8 is a drawing illustrating the components provided inside the case of the induction heating type cooktop shown in FIG. 7. Figure 9 is a drawing illustrating the arrangement of a heated object on an induction heating cooktop shown in Figure 7. Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the attached drawings. In the drawings, the same reference numerals are used to indicate the same or similar components. Hereinafter, an induction heating type