KR-102961264-B1 - INDUCTION HEATING TYPE COOKTOP

KR102961264B1KR 102961264 B1KR102961264 B1KR 102961264B1KR-102961264-B1

Abstract

A cooktop according to the present disclosure comprises first and second working coils that generate a magnetic field to heat a cooking vessel, an inverter that supplies current to at least one of the first and second working coils, and first and second resonant capacitor modules that resonate with the first and second working coils, wherein current may selectively flow through the second working coil and the second resonant capacitor module depending on the type of cooking vessel.

Inventors

문현욱
정경훈
이재우
김양경

Assignees

엘지전자 주식회사

Dates

Publication Date: 20260508
Application Date: 20210223

Claims (10)

First and second working coils that generate a magnetic field to heat a cooking vessel; An inverter that supplies current to at least one of the first and second working coils; and It includes first and second resonant capacitor modules that resonate with the first and second working coils, and Current flows selectively through the second working coil and the second resonant capacitor module depending on the type of cooking vessel, and The above first resonant capacitor module is It includes a first resonant capacitor and a second resonant capacitor, and The above second resonant capacitor module is It includes a third resonant capacitor and a fourth resonant capacitor disposed between the first resonant capacitor and the second resonant capacitor, and A wire further comprising one end connected between the first resonant capacitor and the third resonant capacitor, and the other end connected between the second resonant capacitor and the fourth resonant capacitor. Induction heating cooktop.
In claim 1, If the above cooking container is a magnetic material, current flows through the first working coil and the first resonant capacitor module, and When the above cooking container is a non-magnetic material, current flows through the first and second working coils and the first and second resonant capacitor modules. Induction heating cooktop.
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In claim 1, The apparatus further comprises a first switch and a second switch driven to selectively flow current to the second working coil and the second resonant capacitor module depending on the type of the cooking vessel. Induction heating cooktop.
In claim 4, The above first switch is A common terminal is connected to the second working coil, and Terminal A is connected between the first working coil and the second working coil, and Terminal B is connected between the third resonant capacitor and the fourth resonant capacitor, and The above second switch is A common terminal is connected to the second working coil, and Terminal A is connected between the first resonant capacitor and the third resonant capacitor, and Terminal B is connected between the third resonant capacitor and the fourth resonant capacitor. Induction heating cooktop.
In claim 5, When the above cooking container is a magnetic material, the first and second switches are driven so that the common terminal and terminal A are connected, respectively, and Current flows through the first resonant capacitor and the second resonant capacitor connected in parallel. Induction heating cooktop.
In claim 6, When the above cooking container is a non-magnetic material, the first and second switches are driven so that the common terminal and the B terminal are connected, and Current flows through the first resonant capacitor module and the second resonant capacitor module connected in parallel. Induction heating cooktop.
In claim 7, When the common terminal of the first and second switches is connected to terminal A, the combined capacitance is greater than the combined capacitance when the common terminal of the first and second switches is connected to terminal B. Induction heating cooktop.
First and second working coils that generate a magnetic field to heat a cooking vessel; An inverter that supplies current to at least one of the first and second working coils; and It includes first to fourth resonant capacitors that resonate with the first and second working coils, and When operating in the first mode, current flows through the first working coil and the first to second resonant capacitors, and When operating in the second mode, current flows through the first and second working coils and the first to fourth resonant capacitors, and A wire further comprising one end connected between the first resonant capacitor and the third resonant capacitor, and the other end connected between the second resonant capacitor and the fourth resonant capacitor. Induction heating cooktop.
A plurality of working coils that generate a magnetic field to heat a cooking vessel; An inverter that supplies current to at least some of the plurality of working coils; and It includes a plurality of resonant capacitors that resonate with the plurality of working coils mentioned above, and Some of the plurality of working coils and some of the plurality of resonant capacitors selectively have current flowing through them depending on the type of cooking vessel, The above plurality of resonant capacitors A first resonant capacitor module including first and second resonant capacitors, and It is composed of a second resonant capacitor module including third and fourth resonant capacitors, and A wire further comprising one end connected between the first resonant capacitor and the third resonant capacitor, and the other end connected between the second resonant capacitor and the fourth resonant capacitor. 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 capable of heating both magnetic and non-magnetic materials. 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. In other words, a cooktop capable of heating both magnetic and non-magnetic containers with high output is required. Japanese Registered Patent Publication No. 4978059, a prior patent, discloses that a short-circuit/open-circuit changing means is controlled so that the combined capacitance of a resonant capacitor is reduced when heating a low-resistance non-magnetic metal. However, since the combined inductance of the cooktop according to the aforementioned prior patent is fixed, there is a problem that the working coil must be designed based on either a magnetic container or a non-magnetic container. For example, assuming the case where the working coil is designed based on a magnetic container, the combined inductance is designed to have a relatively small value for high output, but in this case, there is a problem that a non-magnetic container with very low coupling resistance requires a considerably large resonant current to be heated to high output. 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. FIGS. 5 and 6 are circuit diagrams showing a working coil module and a resonant capacitor module of a cooktop according to one embodiment of the present disclosure. FIGS. 7 to 9 are circuit diagrams showing a working coil module and a resonant capacitor module of a cooktop according to another 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) contains an electrical resistance component, the magnetic field (20) can induce an eddy current (30) in the cooking vessel (1). This eddy current (30) heats the cooking vessel (1) itself, and since this heat is transmitted through conduction or radiation to the interior of the cooking vessel (1), the contents of th