KR-102961259-B1 - INDUCTION HEATING TYPE COOKTOP

KR102961259B1KR 102961259 B1KR102961259 B1KR 102961259B1KR-102961259-B1

Abstract

The present disclosure relates to an induction heating type cooktop, comprising a top glass on which a cooking vessel is placed, a working coil module that generates a magnetic field to heat the cooking vessel, and an inverter that drives current to flow through the working coil module, wherein the working coil module may include a first working coil wound to form a plurality of turns and a second working coil wound between the turns of the first working coil.

Inventors

박경호
김의성
이재우

Assignees

엘지전자 주식회사

Dates

Publication Date: 20260508
Application Date: 20210225

Claims (10)

Glass top on which cooking vessels are placed; A working coil module that generates a magnetic field to heat the above cooking vessel; It includes an inverter driven to allow current to flow through the above-mentioned working coil module, and The above working coil module is Base, and It includes first and second working coils that are alternately wound on the same plane of the base, and The first working coil above forms a plurality of turns, and The second working coil is wound between the turns of the first working coil, and Depending on the type of the above cooking vessel, current is supplied to both the first working coil and the second working coil, or to only one of them. Induction heating cooktop.
In claim 1, The above-mentioned first working coil is placed on odd turns, and The above second working coil is placed on an even turn. Induction heating cooktop.
In claim 1, The above working coil module is A first relay further comprising connecting the first working coil and the second working coil, Induction heating cooktop.
In claim 3, The above first relay is Connected between the last turn of the first working coil and the first turn of the second working coil, Induction heating cooktop.
In claim 4, The above first relay is Turning on or off based on the type of cooking container above, Induction heating cooktop.
In claim 3, The above first relay is It is connected between the first working coil and the second working coil, The above working coil module is A second relay further comprising one end connected between the first working coil and the first relay, and the other end connected between the second working coil and the resonant capacitor. Induction heating cooktop.
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In claim 1, When the above cooking container is a magnetic material, current is supplied to only one of the first working coil and the second working coil, and When the above cooking container is a non-magnetic material, current is supplied to both the first working coil and the second working coil, Induction heating cooktop.
In claim 1, The difference between the outer diameter of the first working coil and the outer diameter of the second working coil is less than or equal to a preset value, Induction heating cooktop.
In claim 1, Each turn of the first working coil and each turn of the second working coil are arranged to be spaced apart by more than a preset threshold value, Induction heating cooktop.

Description

Induction Heating Type Cooktop The present disclosure relates to an induction heating type cooktop, and more specifically, to an induction heating type cooktop having a coil switching structure. 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, but recently, devices that heat cooking vessels using electricity instead of gas are becoming more popular. Methods of heating an object using electricity are broadly divided into resistance heating and induction heating. Resistance heating is a method of heating 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 a cooking vessel through radiation or conduction. Induction heating, on the other hand, is a method of heating the cooking vessel itself by generating eddy currents in a cooking vessel made of metal components using a magnetic field generated around a coil when high-frequency power of a predetermined magnitude is applied to the coil. Meanwhile, in this induction heating method, there is a problem in that the output power varies depending on the material of the cooking vessel even when the same current is applied to the coil. Specifically, non-magnetic vessels have lower resistivity than magnetic vessels due to lower permeability, and consequently, the output of non-magnetic vessels is smaller than that of magnetic vessels. Accordingly, a method to increase output for non-magnetic containers as well as magnetic containers is required. Prior patent Japanese Published Patent Application No. 2010-257996 discloses heating both steel pots and aluminum pots by controlling the phase difference of current flowing through multiple heating coils according to the material of the cooking container to adjust the load impedance, wherein the multiple heating coils are implemented in a structure with different outer diameters or in a structure installed in two layers. However, when the multiple heating coils are implemented in a structure with different outer diameters, there is a problem of temperature non-uniformity occurring at the bottom of the heating element because magnetic flux is not generated in the vicinity where the multiple coils are adjacent. In addition, when the multiple heating coils are implemented in a two-layer structure, there is a disadvantage of increased size. FIG. 1 is a perspective view showing a cooktop and a cooking vessel according to an embodiment of the present disclosure. FIG. 2 is a cross-sectional view of a cooktop and a cooking vessel according to an embodiment of the present disclosure. FIG. 3 is a diagram showing a circuit of a cooktop according to an embodiment of the present disclosure. FIG. 4 is a drawing showing the output characteristics of a cooktop according to an embodiment of the present disclosure. FIG. 5 is a circuit diagram of a working coil module provided in a cooktop according to an embodiment of the present disclosure. FIG. 6 is a drawing showing an example of the installation of a working coil module provided in a cooktop according to an embodiment of the present disclosure. FIG. 7 is a cross-sectional view of a working coil module and a base according to an embodiment of the present disclosure. FIG. 8 is a block diagram illustrating a method of operation of a cooktop according to an embodiment of the present disclosure. FIG. 9 is a flowchart illustrating the operation method of a cooktop according to an embodiment of the present disclosure. FIG. 10 is a drawing showing the structure of a ferrite provided in a cooktop according to an embodiment of the present disclosure. Hereinafter, embodiments related to the present disclosure will be described in more detail with reference to the drawings. The suffixes "module" and "part" for components used in the following description are assigned or used interchangeably solely for the ease of drafting the specification and do not have distinct meanings or roles in themselves. Hereinafter, an induction heating type cooktop and a method of operation thereof according to an embodiment of the present disclosure will be described. For convenience of explanation, the “induction heating type cooktop” will be referred to as the “cooktop.” FIG. 1 is a perspective view showing a cooktop and a cooking vessel according to an embodiment of the present disclosure, and FIG. 2 is a cross-sectional view of a cooktop and a cooking vessel according to an embodiment of the present disclosure. A cooking vessel (1) can be positioned on top of a cooktop (10), and the cooktop (10) can heat the cooking vessel (1) positioned on top. First, explain how the cooktop (10) heats the cooking vessel (1). As illustrated in FIG. 1, the cooktop (10) can generate a magnetic field (20) such that at least a portion of it passes through the cooking vessel (1). At this time, if the material of the cooking vessel (1)