KR100818944B1 - Heating device and light emitting device using induction heating - Google Patents

Abstract

The present invention relates to a heating device and a light emitting device using induction heating,

A power supply unit supplying an AC current; An induction coil through which the current flows to generate an alternating magnetic flux; Heat is generated by the alternating magnetic flux and is made of a heating element in the form of a plate or tube made of a ferromagnetic material or a ferromagnetic alloy having a high heat generating efficiency,

The heating element is characterized in that it is made of a material having a Curie temperature higher than the maximum operating temperature or a material having a Curie temperature near the maximum or optimal operating temperature.

Description

Heating device and light emitting device using induction heating {A Heating Apparatus and luminous Apparatus Using Induction Heating}

1 is a simplified configuration diagram of a conventional induction heating device

2 is a simplified block diagram of an induction heating apparatus according to the present invention

Figure 3 is a view showing a heating plate and induction coil for the induction heating device of the present invention

Figure 4 is a view showing a heating plate and a support plate for the induction heating device of the present invention

5 is a view showing the installation state of the heating plate for the induction heating device of the present invention.

6 is a simplified diagram showing a magnetic body for magnetic flux induction for induction heating device of the present invention

7 is a view showing a first embodiment of the induction heating apparatus of the present invention.

Figure 8 is a view showing a second embodiment of the induction heating device of the present invention

9 is a view showing a third embodiment of the induction heating apparatus of the present invention

10 is a view showing a fourth embodiment of the induction heating apparatus of the present invention

11 is a view showing a fifth embodiment of the induction heating apparatus of the present invention.

12 is a view showing a sixth embodiment of the induction heating apparatus of the present invention.

13 is a view showing a seventh embodiment of the induction heating apparatus of the present invention.

14 is a view showing an eighth embodiment of the induction heating apparatus of the present invention.

15 shows a ninth embodiment of the induction heating apparatus of the present invention.

<Explanation of symbols for the main parts of the drawings>

1: eddy current 2: AC flux

10: power supply 20: induction coil

50: heating plate 60: heat insulating material

The present invention relates to a heating device and a light emitting device using induction heating, and more particularly, to a heating device and a light emitting device using induction heating, including a heating plate or a light emitting plate that generates heat by the alternating magnetic flux generated in the induction coil. It is about.

In general, the heat required for living is obtained by supplying current to combustion or electrical resistance of coal, oil, gas and the like. However, as income levels increase, electricity-generating home heating devices do not consume oxygen and are increasingly used because of the characteristics of maintaining a comfortable and fresh room and ease of use.

All electric heating devices use joule's heat generated when current flows through the resistance.The heating elements are mainly nichrome wire heating element, ceramic heating element, positive temperature coefficient (PTC) heating element and carbon heating element. This is used.

Among these electric heating devices, the heating device using induction heating has an excellent advantage that the heating efficiency is much better than the heating devices using other electricity, thereby reducing the electric charge. However, existing heating devices by induction heating are mainly used for industrial purposes, and domestic electric rice cookers using induction heating are rapidly spreading in Korea recently.

However, existing induction heating devices used for industrial or domestic use a method of heating by generating a eddy current in the conductor plate or the conductor bowl itself for cooking food for heat treatment. In this case, there is a disadvantage in that the heated object to be heated must be a conductor, and the heating power also changes greatly when the material properties of the heated object change, such as in a cooker.

In order to explain in more detail the disadvantages of the conventional induction heating device, a simplified configuration diagram of the conventional induction heating cooker 90 is shown in FIG. 1. As shown in FIG. 1, the existing induction heating cooker 90 includes a power supply unit 10 for supplying an alternating current; An induction coil 20 for generating alternating magnetic flux by the alternating current; It consists of a conductor vessel 30 which is directly heated by the eddy current 1 generated by the alternating magnetic flux 2 and contains food.

As described above, the conventional induction heating device 90 generates an eddy current 1 on the bottom surface 31 of the cooking vessel 30 by the alternating magnetic flux 2 generated by the induction coil 20. A method in which the bottom surface 31 is generated by self resistance is used.

For this reason, the conventional induction heating apparatus 90 used for home as shown in FIG. 1 is changed according to the magnitude of the eddy current when the permeability of the vessel 30 is used to compensate for this, the existing high frequency power supply The circuit for detecting the change in permeability of the vessel and the circuit for changing the frequency of the current supplied to the induction coil are generally added, so that the power supply is complicated and expensive.

In addition, when using the bowl 30 having a low permeability, such as copper or aluminum in the conventional induction heating device 90 has a disadvantage that the heat generation efficiency is very low and the power consumption is greatly increased.

As in the conventional induction heating unit 90 shown in Figure 1, the existing induction heating unit for industrial or home use a method of directly heating the heating element by eddy current.

On the other hand, the light-emitting device used in daily life is mainly used incandescent lamps and fluorescent lamps. They all use filaments of tungsten wire. However, their use time is generally about 1000 hours for bulbs and about 5000 hours for fluorescent lamps. This is mainly caused by the breakdown of filaments due to the evaporation of tungsten wire at high temperatures above 2000 ℃. That is, their use time is short mainly because they use thin filament lines.

The present invention devised in view of the above-mentioned circumstances is to provide a general induction heating device in which the heating element is indirectly heated by the heating element further comprising a heating element, and having a plate having a high heating efficiency and a strong structure or To provide a heating element in the form of a tube.

In addition, the present invention is to provide a general induction heating light emitting device having a light emitting plate, and to provide a material and structure of the light emitting plate for the surface emission for the induction heating light emitting device.

The present invention for achieving the above object,

A power supply unit supplying an AC current; An induction coil through which the current flows to generate an alternating magnetic flux; Heat is generated by the alternating magnetic flux and is made of a heating element in the form of a plate or tube made of a ferromagnetic material or a ferromagnetic alloy having a high heat generating efficiency,

The heating element is characterized in that it is made of a material having a Curie temperature higher than the maximum operating temperature or a material having a Curie temperature near the maximum or optimal operating temperature.

Induction heating device is a phenomenon in which a conductor is heated by eddy current loss when alternating magnetic flux intersects with the surface of the conductor, especially eddy current loss and hysteresis loss when the conductor is magnetic. The conductor generates heat.

The eddy current loss is a phenomenon in which a eddy current is generated in the direction of counteracting the alternating magnetic flux on the surface of the conductor placed in the alternating magnetic flux and is generated by Joule's heat, that is, P = i ² * R. Where P is power, i is current, and R is resistance.

In addition, magnetic hysteresis loss occurs only in the magnetic body, and the magnetic molecules constituting the magnetic body generate heat by rotational vibration in the alternating magnetic flux. That is, it shows the energy loss per unit volume in which the area surrounded by the hysteresis curve occurs when the alternating magnetic flux is repeated once.

In particular, the most important characteristics of the magnetic material generated by induction heating are Curie temperature and specific permeability. Here, the Curie temperature is a temperature at which the magnetization of the magnetic body disappears due to the disturbance caused by thermal motion when the magnetic body is heated to a temperature higher than the Curie temperature, thereby changing to a paramagnetic body having a specific permeability of approximately one.

Table 1 shows the specific permeability and Curie temperature of various materials. As shown in Table 1, the specific permeability of paramagnetic aluminum, tungsten and diamagnetic copper is almost 1, but the relative permeability of ferromagnetic nickel, cobalt, iron and 78 permalloy is much higher than 1. In addition, among the ferromagnetic materials of Table 1, the Curie temperature of cobalt is the highest as 1152 ℃. In general, a desired Curie temperature can be obtained by ferromagnetic alloys that are alloyed with ferromagnetic materials and other materials.

Equation 1 shows the formula to obtain the skin thickness (δ, skin depth) and skin resistance (R _ac, skin resistance) of the conductor.

Where ｆ is the frequency of the current, σ is the electrical conductivity, μ is the permeability, and π is the circumferential rate. The eddy current generated on the surface of the conductor by the alternating magnetic flux is rapidly decayed exponentially in the conductor, where the skin thickness refers to the depth at which the current at the surface of the conductor decreases to 1 / e, or 36.7%, in the conductor. Since the eddy currents are concentrated and distributed between the thicknesses of the conductors on the surface of the conductor, the resistance between them is called the skin resistance.

Skin thickness and skin resistance vary greatly according to the values of frequency and specific permeability, as shown in Equation (1). The heating power generated between the conductor surface and the skin thickness accounts for 86.5% of the total power. At 0.8 times the skin thickness, 80% of the total power is generated. At 1.5 times and 3.1 times the thickness of the skin, 95% and 98% of the total heat generation power is generated.

Table 2 shows the electrical resistivity of each material and the skin thickness and skin resistance at 50 kHz and 100 kHz, respectively. However, the values of Table 1 and Table 2 were measured at 20 ℃. Specifically, the skin thicknesses of the paramagnetic and the ferromagnetic 78 permalloy, which were obtained using Equation 1 at a frequency of 50 kHz, are very large, 364.17 μm and 2.85 μm, respectively. Of particular note is that the skin thickness of the 78 permalloy is very thin at 2.85 μm at 50 kHz, and as shown in Table 2, the skin resistance of the 78 permalloy is about 790 times greater than that of aluminum. As the frequency increases from 50 kHz to 100 kHz, the thickness of the skin decreases, thus the skin resistance increases. In general, induction heating heating devices used for home use a frequency of 10kHz to 100kHz.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

First, in the drawings, the same components are to be noted that the same reference numerals.

In describing the present invention, detailed descriptions of related well-known functions or configurations are omitted in order not to obscure the subject matter of the present invention.

As shown in FIG. 2, the heating device and the light emitting device using induction heating according to the present invention include a power supply unit 10 for supplying an AC current; An induction coil 20 for generating the alternating magnetic flux by flowing the alternating current; A heat generating plate 50 generated by the eddy current 1 generated by the alternating magnetic flux 2; It is composed of a heat insulating material 60 for protecting the induction coil 20 from the heat generated by the heat generating plate (50).

However, in FIG. 2, a flat induction coil 20 was used.

It is preferable that the heating plate 50 is more than 0.8 times the thickness of the skin thickness so as to be mostly interlinked with the alternating magnetic flux 2 to have a high heat generating efficiency.

In addition, the solid plate is further included in FIG. 2, and the solid plate may be indirectly heated by the heat generating plate 50. In addition, the solid plate may be a container or bowl for cooking or containing water.

As shown in FIG. 3, the heating plate 50 or the induction coil 20 may be composed of one or more cells each, and the heating plate 50 may be separately supplied to each of the induction coils 20. It is easy to change the area of heat generated from

That is, one or more induction coils 20 and 21 may be included in one heating plate 50 as shown in FIGS. 3A and 3B according to the present invention. In this case, the power supply unit 10 is connected to the induction coils 20 and 20. By selectively supplying a current it is possible to adjust the heat generating area of the heating plate (50).

More specifically, in order to change the heating area of the heating plate (50, 51) as shown in Figure 3a further includes another induction coil 21 in the form of a donut in the outer periphery of the induction coil 20, or as shown in Figure 3b Another induction coil 21 may be further included next to the induction coil 20. At this time, the width of the heating plate 50 is preferably to cover all the induction coil (20).

 Alternatively, as shown in FIG. 3C and FIG. 3D, a plurality of heating plates 50 and 51 may be formed and respective induction coils 20 and 21 may be formed therein. The heating plates 50 and 51 and the induction coils 20 and 12 may be configured such that one induction coil is positioned on one heating plate, as shown in FIGS. 3C and 3D.

The method of FIGS. 3C and 3D and the method of FIGS. 3A and 3B may be combined with each other. The area generated by the power supply unit 10 selectively supplies AC current to the induction coils 20 and 21 may be changed. The heating plates 50 and 51 and the induction coils 20 and 21 illustrated in FIG. 3 are drawn in a rectangular shape for convenience, but may have a circular shape or other shapes. In addition, when the induction coil is wound in the form of a solenoid may have a shape as shown in FIG. 3e. A plurality of induction coils and a heating element in the form of a plate or tube may be formed.

In addition, it should be noted that in the induction heating heating apparatus of FIG. 2, when the distance between the induction coil 20 and the heating plate 50 becomes too large, the alternating magnetic flux 2 that is connected to the heating plate 50 is reduced, thus reducing the heating efficiency. do. Therefore, as shown in FIG. 2, the induction heating apparatus according to the present invention further includes a heat insulating material 60 between the induction coil 20 and the heating plate 50, thereby spacing between the induction coil 20 and the heating plate 50. By narrowing the heat generation efficiency to increase the at the same time to protect the induction coil 20 from the heat generated from the heating plate (50). In addition, unlike the above, both sides of the induction coil 20 may be covered with a heat insulating material to protect the induction coil 20.

The induction coil 20 uses a litz wire, and the litz wire may be twisted with each other so as to suppress generation of a eddy current 1 in itself.

The heating plate 50 may further include a layer having corrosion resistance on its surface.

In addition, the heating plate 50 may further include a functional coating such as a ceramic coating such that far infrared rays or anions or both are emitted together.

It is preferable that the thickness of the heating plate 50 is thicker than 0.8 times the thickness of the skin so that most of the magnetic flux interlinks with the heating plate 50. However, when the thickness of the heating plate 50 becomes too thick than the skin thickness, heat is mainly generated only on the surface of the heating plate 50 facing the induction coil 20, and heat is generated on the surface of the heating plate 50 on the opposite side, that is, the portion requiring heat. It is good not to make the heating plate too thick because a problem occurs that does not occur. Specifically, it may be desirable to set it to 3.1 times or less of the skin thickness, which is a thickness at which 98% of the total power is generated.

In addition, the heating plate 50 according to the present invention may be made of ferromagnetic or ferromagnetic alloys such as Fe, Co, Ni, Gd in order to increase the heating power. Specifically, the ferromagnetic alloy is made of Ni alloys such as Ni-Cr alloys, Fe alloys such as stainless steel or permalloy, Fe-Co alloys or alnico, Co-containing alloys, or Mn or Cr-containing alloys. Can be. The alloys may further include elements of Si, Al, C, Mn, Cu, Cr, Mo, V, W, etc. up to 10%.

In addition, the heating plate 50 is preferably a ferromagnetic material within the working temperature range in order to have a high heat generating efficiency. In addition, the heating plate 50 may be a material having a Curie temperature near the maximum operating temperature or the optimum operating temperature to prevent the heating plate 50 from overheating.

The plate- or tube-shaped light emitter can prevent overheating or maintain an optimal exothermic temperature by using a material having a Curie temperature near the maximum or near optimum operating temperature. In other words, if the temperature of the heating element is higher than the Curie temperature, the heating element is changed to paramagnetic material and the heating power is reduced, so that the temperature of the heating element is lowered. . By this principle, the temperature of the heating element can be kept almost constant near the Curie temperature.

In addition, the heating plate 50 may be made of an amorphous alloy to obtain a desired Curie temperature and specific permeability.

In general, induction heating with alternating frequency of alternating magnetic flux in ferromagnetic material with the same thickness is known to have higher magnetic hysteresis loss when the frequency of alternating magnetic flux is lower, but higher eddy current loss when higher than a certain frequency. Of course, it depends on the material of the heating plate, but in the case of a conductor, it is known that the eddy current loss is larger when the frequency is about tens of kHz or more.

The eddy current loss varies greatly depending on the nonlinearity such as the specific permeability and other conditions. However, when the thickness of the conductor is much thicker than the skin thickness, it is known that the heating power due to the eddy current increases in proportion to the square root of the frequency as in Equation 2.

Where ｋ is the proportional constant, N is the number of times the induction coil is wound, i is the current, ρ is 1 / σ, and electrical resistivity, ｆ is the frequency. In particular, it is noteworthy in Equation 2 that the heat generation power due to eddy current loss is proportional to the skin resistance (or the square root of the electrical resistivity), the effect of the skin resistance (or electrical resistivity) is very large. Specifically, according to Table 2, the heating power of iron by induction heating at a frequency of 50 kHz is 137 times larger than that of aluminum. In other words, very small skin resistance, such as aluminum, generates a small amount of heat generation power even if eddy currents occur.

In other words, in order to obtain high heating power by eddy current loss, the electrical resistivity of a conductor generally needs to be high. A common way to increase the electrical resistivity of conductors is to use alloys. According to Equation 2, the heating plate 50 is preferably made of a ferromagnetic alloy having a high specific permeability and a large specific resistance.

On the contrary, the heating power generated by the loss of magnetic history can be obtained from the empirical formula obtained by Steinmetz of Equation (3).

Where k _h is a hysteresis constant, B represents the magnetic flux density at the conductor surface. If the frequency of alternating magnetic flux is low, the heating plate may be made of a material having high magnetic history loss instead of a material having high eddy current loss.

The heating power by induction heating generated by eddy current loss and magnetic history loss increases as the frequency of the AC current supplied to the induction coil increases. Therefore, the use of a higher frequency has the advantage that it is possible to obtain a larger heating power and at the same time reduce the volume of the power supply.

The heat generating plate according to the present invention may be composed of a heat generating layer 50b generated by alternating alternating magnetic flux as shown in FIG. 4A and a conductive layer 50a for conducting heat of the heat generating layer 50b. In addition, the heating layer 50b and the conductive layer 50a of FIG. 4A may be formed in plural numbers. In this case, in order to obtain high heat generating efficiency, the heat generating layer 50b may be a ferromagnetic material or a ferromagnetic alloy having a high specific resistance and a high permeability. The conductive layer 50a may be formed of a material capable of conducting most of the heat generated in the heat generating layer 50b so as to have a low heat loss. To this end, the conductive layer 50a may be a conductor having a low resistance, that is, a material having a high thermal conductivity, and having a thin thickness. Such a structure can also be used for heating tubes for solenoid induction coils.

In addition, Figure 4b in Figure 4b according to the present invention shows the shape of the support plate 55 and the heating plate of the non-conductive material for supporting the heating plate 50 when using the flat plate induction coil. As shown in Table 2, in the case of 78 permalloy having a high specific permeability, when the frequency of the alternating current is 50 kHz, the skin thickness becomes too thin as 2.85 μm, and thus, a support plate 55 for supporting the heating plate 50 may be further included.

4b to 4c, the heating plate 50 according to the present invention may be located on the support plate 55 or above the groove, and as shown in FIG. 55 may be placed inside.

4E shows a shape of the heat generating tube 53 for generating heat and the support tube 56 for supporting the solenoid type induction coil 20. The heating tube 53 has a hollow pipe (pipe) form, the induction coil 20 is wound around the outer periphery of the support tube 56 located at the outermost. In the case of the solenoid type induction coil, when the thickness of the heating tube 53 becomes too thin, a non-magnetic and non-conductive support tube 56 for supporting the heating tube 53 may be further included as shown in FIG. 4E. In FIG. 4E, the heating tube 53 is positioned inside the support tube 56, but unlike the FIG. 4E, the heating tube 53 may be positioned outside the support tube 56. This structure could be used to warm air by passing air into a heated heating tube.

In addition, Figure 5 shows the structure of the heating plate and the heating tube that can be used as a heater for heating the air by further adding a blower.

As shown in the heating plate of FIG. 5A and the heating tube of FIG. 5B according to the present invention, a plurality of heating plates or heating tubes having different radii may overlap each other. In FIG. 5A, two heating plates 50c and 50d are supported by two supporting plates 55c and 55d, respectively, and the two heating plates 50c and 50d face each other. In this case, one or two induction coils for heating the heating plates 50c and 50d may be provided on the outside of the support plates 55c and 55d. If one induction coil is provided outside of the support plates 55c and 55d, the heating plates cause the alternating magnetic flux generated in the induction coil to be connected to both of the heating plates 50c and 50d to generate heat. The total thickness of the pores is preferably made thicker than 0.8 times the skin depth.

In addition, in the present invention, as shown in FIG. 5C, the support tube 53 may be positioned inside the heat generating tube 53. In this case, the induction coil is wound around the outer circumference of the outer tube 59 by further adding an outer tube 59 of the non-conductive material to the outside of the heating tube 53. It is preferable that the material of the outer tube 59 is an insulator. Alternatively, instead of the outer tube 59 in FIG. 5C, the heating tube 53b and the support tube 56b shown in FIG. 5B may be positioned so that the two heating tubes face each other.

Such a method can be usefully used for warming air in a heater, and can increase the heating efficiency by greatly increasing the area where the air is heated.

In addition, two heating plates 50c and 50d may be heated by induction coils by providing induction coils on both outer sides of the support plates 55c and 55d in FIG. 5A, respectively.

FIG. 5B shows the heating tubes 53a and 53b in which the induction coil is wound in the form of a solenoid and the support tubes 56a and 56b for supporting them. In this case, the induction coil is located on the outer circumference of the outermost support tube 56b and the two heating tubes 56a and 56b located inside the induction coil are heated together by the alternating magnetic flux generated from the induction coil. For this reason, it is preferable to adjust the thickness of the heating tubes so that the alternating magnetic flux penetrates the two heating tubes 53a and 53b so that the heating tubes are all heated. By using this method, the total heat generating area of the heating plate and the heating tube can be greatly increased.

6A and 6B according to the present invention, a magnetic shield for magnetic flux shielding, such as ferrite, having a high resistance and a high permeability, may be further included to prevent electromagnetic interference due to electromagnetic waves generated in the induction coil 20. . This improves product reliability by preventing unnecessary magnetic flux leakage and reducing electromagnetic interference (EMI) noise.

6A and 6B show simplified forms of magnetic shielding magnetic bodies when induction coils in the form of a plate and a solenoid are used, respectively.

As shown in FIG. 6A, an alternating magnetic flux 2 generated in the induction coil 20 is connected to the heating plate 50 so that a eddy current 1 is generated and heated in the heating plate 50, and the alternating magnetic flux 2 generated at this time is generated. Magnetic flux for inducing magnetic shields (70, 71) to shield the induction coil 20 to the outside.

In the case of FIG. 6A, two magnetic materials 70 and 71 may be formed, but the magnetic materials 70 and 71 may be connected to each other to form one magnetic material. Ferrite, which is a metal oxide, is generally used as a magnetic shielding magnetic material because of its large electrical resistance and low power loss due to eddy currents.

6B also shows magnetic flux induction magnetic bodies 72 and 73 that can be used in the solenoid induction coil 25. The magnetic bodies 72 and 73 surround the induction coil 25 at both corners of the heating tube 53. All of the magnetic induction magnetic bodies 70 to 73 shown in FIG. 6 may be manufactured in the form of a square bar and may be formed in plural.

The above-mentioned information may be applied to embodiments of a heating device or a light emitting device using induction heating described below.

(First embodiment)

7 illustrates an embodiment in which the induction heating apparatus 100 according to the present invention is applied to an electric range, an electric fan, an electric grill, an electric roaster or a hot plate.

Induction heating heating device 100 according to the present invention and the power supply for generating an alternating current (10); A planar induction coil 20 for generating an alternating magnetic flux by flowing the alternating current; A heating plate 50 made of a ferromagnetic material or a ferromagnetic alloy heated by a eddy current 1 generated by the alternating magnetic flux 2; A heat insulating material 60 for protecting the induction coil 20; An upper plate 110 supporting the heating plate 50; It is composed of a cooking vessel 130 is indirectly heated by the heat generated from the heating plate (50).

As shown in FIG. 7, a eddy current 1 is generated in the heating plate 50 by the alternating magnetic flux 2 generated by the induction coil 20, thereby heating the heating plate 50. At this time, the bottom surface 131 of the bowl 130 is warmed by the generated heat to cook.

Induction heating heating device 100 according to the present invention, but the heating plate 50 is heating the bowl 130 to cook food, the existing induction heating device is a bowl 130 itself in the eddy current as shown in FIG. The difference is that it is heated.

Therefore, the vessel 130 used in the conventional induction heating device shown in Figure 1 has the disadvantage that it must be a conductor. However, the induction heating heating device 100 according to the present invention has a wide range of versatility because the bowl 130 is heated by the heat generated by the heating plate 50, so that all kinds of bowls including non-conductive materials can be used.

In this case, instead of the support plate shown in FIG. 4D to FIG. 4D, the heating plate 50 may serve as a support plate for supporting the heating plate 50. The heating plate may be inserted into the upper plate 110, and the heating plate may be integrally formed with the upper plate 110.

Induction heating heating apparatus 100 according to the present invention may further include a temperature sensor and a temperature display for measuring the temperature of the heating plate 50 so that the user can easily know the temperature of the heating plate (50).

(2nd Example)

8A and 8B illustrate an embodiment in which the induction heating apparatus 200 according to the present invention is applied to an electric pot or an electric rice cooker.

Induction heating heating device 200 of Figure 8 is made of the same basic configuration as in FIG.

8A and 8B, the bottom surface 231 or the side surface 232 or both portions of the bowl 230 are heated and cooked by the heat generated from the heating plate 50.

In this case, the induction coil 20 of FIG. 8A has a flat plate shape such as a spiral shape, but the induction coil 25 of FIG. 8B is wound around the heating tube 53 in the form of a solenoid. Alternatively, a flat induction coil may be located on the side. That is, one or more heating plates may be disposed on the side surface, and the one or more induction coils may have a flat plate shape composed of zigzag or spiral shape. And in all embodiments the solenoid form used on the side may be replaced by a flat form. When the plate-shaped induction coil is provided on the side surface, various types of plates, such as a flat plate or a curved plate or a concave plate, may be used.

(Third Embodiment)

9 shows an embodiment in which the induction heating device 300 according to the present invention is applied to an electric oven or the like.

The induction heating heating device 300 of FIG. 9A has a basic configuration as shown in FIG. 7, and the shelf 330 is heated by the heat generated from the heating plate 50.

The heating plate 50 is cooked by heating the bottom surface 330 of the shelf by conduction or convection of heat. In addition, the solenoid type induction coil 20 and the heating tube 53 may be further included on the side surface as shown in FIG. 9B. The solenoid induction coil may be configured in the form of a flat plate as in the third embodiment.

In addition, the induction heating apparatus 300 according to the present invention may further include a blower therein to cook with hot air. In addition, the induction heating device 300 may be to cook by the steam by generating steam.

(Example 4)

Induction heating heating device 400 according to the present invention of Figure 10 shows an embodiment that can be applied to the electric boiler or electric instant water heater or humidifier or electric port for warming water. The basic configuration is the same as FIG. 7 and the water tank or the bowl 430 containing the water 410 is heated by the heat generated from the heating plate 50 to heat the water.

As shown in FIG. 10, the heating plate 50 is heated by the alternating magnetic flux generated by the induction coil 20, and the bottom surface 431 of the water tank 430 or the bowl 430 is heated to heat the water.

In the case of FIG. 10, a flat type induction coil and a heating plate are used, but a solenoid type or flat type induction coil may heat the side surface.

Electric instantaneous water heater according to the present invention can be used for shower, sink or neck.

(Example 5)

Induction heating apparatus 500 according to the present invention of Figure 11 is an embodiment showing an automated heating method such as food or objects. In the case of Figure 11, the basic configuration of Figure 7 includes a moving means (520, 510) for transporting the vessel 530 containing the food or object 550 is heated. The vessel 530 which is moved by the moving means 520 and 510 is heated by heat generated by the heating plate 50 for a predetermined time. The moving means shown in FIG. 11 includes a support 520 for supporting a circular rotating body 510 and a bowl 530. Specifically, the support 520 may be made to hang the bowl 530 on both sides so that the heating plate 50 can heat the bowl 530. Alternatively, the heating plate may be moved by the moving means, or the heating plate and the object to be heated may move together.

The induction heating heating device of FIG. 11 further includes a blower, wherein the heating plate 50 may heat the air, and food or objects may be dried by the heated air. In addition, the heating plate 50 may heat water to generate water vapor, and may heat food or an object with the water vapor.

(Example 6)

12A to 12C according to the present invention, the induction heating device 600 of FIG. 12 includes a power supply unit 10 for generating an alternating current; An induction coil (20) using a litz wire for generating an alternating magnetic flux by flowing the alternating current; A heat generating plate 50 made of a ferromagnetic material or a ferromagnetic alloy in order to generate heat by the magnetic flux and increase heat generating efficiency; Magnetic shielding magnetic material (not shown) having high resistance and high permeability such as ferrite to prevent electromagnetic interference; It is composed of a heat insulating material 60 for protecting the induction coil 20 and the like from the heat generated in the heating plate 50,

The thickness of the heating plate 50 is thicker than 0.8 times the thickness of the skin to obtain high heating efficiency, so that most of the magnetic fluxes link with the heating plate 50 and at the same time, the heating plate 50 has a higher Curie temperature than the maximum operating temperature. It is made of a material having, and the heating plate 50 is composed of one or more of the heating plate or induction coils so that the heat generating area can be easily changed, characterized in that the power can be supplied separately to each of the induction coils do. 12 does not show the magnetic flux induction magnetic material for convenience.

12A to 12C, the induction heating device 600 according to the present invention uses a heating plate 50 heated by induction heating instead of the existing heating element using a heating wire, and radiant heat generated from the heating plate 50 is used. I use it. That is, the existing heaters use a heating wire in the form of a line, but the heating plate 50 uses a surface heating element in the form of a plate. For this reason, since the heating plate 50 can emit more heat per unit area than the existing heating wires, the size of the product can be made smaller, and the possibility of failure due to disconnection is low.

In addition, as illustrated in FIGS. 12B and 12C, a blower 610 may be further added to force cold air through the heated heating plate or the heating tube, thereby discharging the heated air 630 to the outside to adjust the room temperature. . The heating plate 50 or the heating tube 53 may be supported by the support plate 55 as shown in Figure 4b to 4e. In addition, the heating plate and the heating tube may have a structure as shown in Figure 4a. In addition, when the structure shown in FIG. 5 is used as a heating element, an area to generate heat and heat generating efficiency can be greatly increased. 12 illustrates a case of a flat induction coil, but a heating tube and a solenoid induction coil as shown in FIGS. 5B and 5C may be used.

(Example 7)

13A to 13D show another induction heating apparatus 700 according to the present invention. The induction heating heating apparatus 700 according to the present invention may be used as an electric fan type electric heater, and a heating plate 50 that generates heat by induction heating rather than conventional heating wire is used as a heating element. The induction heating apparatus 700 further includes reflecting plates 710 and 720 in the basic configuration shown in FIG. 12.

More specifically, the induction heating device 700 according to the present invention further includes a flat plate heating plate 50 that is generated by induction heating, unlike the conventional heater using a heating wire, and the heating plate 50 A convex bowl-shaped front reflector 710 is further included in the center portion of the front protection net 780 facing the front surface, so that the radiant heat 701 generated by the heating plate 50 is reflected by the front reflector 710 and is concave again. Radiant heat 701 reflected by the rear reflector 720 in the form is supplied to the user. The material of the reflecting plates 710 and 720 is preferably a conductor.

In addition, as shown in FIG. 13C, the radiant heat 701 is radiated from the heating plate 50 by further including a blower 730, and at the same time, the air introduced from the inlet 750 is heated using the blower 730, and the heated air 702. You can adjust the temperature of the room by).

In addition, in order to obtain a warm air, as shown in FIG. 13D, a heating plate 51, an induction coil 21, and a blower 630 for only warm air may be further provided to have a function of controlling the room temperature by heated air. . In the case of FIG. 13D, the positions of the heating plate 51, the induction coil 21, and the blower 730 for the warm air may be located at the head of the fan type heater 700 or other parts.

(Example 8)

14 shows another induction heating apparatus 800 according to the present invention. The induction heating apparatus 800 of FIGS. 14A to 14C has the same basic configuration as the heating apparatus 800 of FIG. 13. As shown in FIG. 13, in FIG. 14, the radiant heat 801 generated by the heating plate 50 is reflected from the first reflecting plate 810 to the second reflecting plate 820 and supplied to the user.

As shown in FIG. 14C, the reflecting plates 810 and 820 may have a planar shape, a concave shape, or a convex shape.

(Example 9)

Unlike the above embodiments of the induction heating apparatus, the following relates to a light emitting device using general induction heating using induction heating. Conventional light emitting devices emit light by passing an electric current through the filament, but an induction heating light emitting device uses a light emitting plate that is heated and emits light by an alternating magnetic flux. The induction heating light emitting device according to the present invention has a great advantage that it is possible to emit light in a planar shape unlike a conventional line light-emitting body using tungsten wire.

Induction heating light emitting device 900 according to the present invention includes a power supply for supplying an alternating current (910); An induction coil 920 for generating an alternating magnetic flux by flowing an alternating current; A light emitting plate 950 which is heated by the alternating magnetic flux and emits light; It is composed of a heat insulating means 960 for protecting the induction coil 920 and the like from the heat generated in the light emitting plate 950.

The induction heating light emitting device 900 may further include a glass tube 930 made of a material such as quartz or glass.

When the frequency of the alternating current supplied from the power supply unit 910 is so high that the thickness of the light emitting plate 950 is too thin, further comprising a support structure (not shown) for supporting the light emitting plate 950 and The light emitting plate 950 may be supported by the support structure. The support structure and the light emitting plate may have a structure as shown in FIGS. 4B and 4C. The support structure may also be part of a glass tube.

In order to easily change the light emitting area of the light emitting plate 950, the light emitting plate 950 and the induction coil 920 are each composed of one or more as shown in FIG. 3, and power is separated from each induction coil 920. It may be supplied.

By narrowing the distance between the induction coil 920 and the light emitting plate 950, the heat exchange means so that most of the alternating magnetic flux generated in the induction coil 920 is connected to the light emitting plate 950 to obtain a high luminous efficiency ( It is desirable to make 960 as thin as possible. The heat insulating means 960 may trap air and use air as a heat insulating material, or may include a thin reflector for reflecting radiant heat.

The induction heating light emitting device 900 further includes a magnetic shielding magnetic material (not shown) such as ferrite to prevent electromagnetic interference as shown in FIG. 6, so that the magnetic material surrounds the induction coil 920 to the outside. Can be shielded.

Table 3 shows the melting points of tungsten and representative ferromagnetic materials. The melting point of tungsten is 3422 ° C, but the melting point of cobalt, a ferromagnetic material, is 1495 ° C, which is too low to be used as a light emitting plate. This is because incandescent bulbs can usually obtain the optimal white light at 2500 ~ 2700 ℃. Therefore, the light emitting plate 950 is preferably made of tungsten or a tungsten alloy having a high melting point.

The heating plate 950 may be a ferromagnetic material in order to obtain a high heat generating efficiency, but since the Curie temperature of the ferromagnetic material is much lower than about 2500 ° C., which is the temperature at which the optimum white light is obtained, an alloy with a high melting point metal may further increase the Curie temperature. It is preferable. More specifically, the light emitting plate 950 may be formed of an alloy of ferromagnetic material such as iron, nickel, and cobalt, and tungsten having a high melting point. The tungsten alloy may further include a small amount of elements such as Si, Al, C, Mn, Cu, Cr, Mo, V, and W.

The light emitting plate 950 preferably maintains a ferromagnetic material within an operating temperature range. In addition, a material having a maximum operating temperature for light emission or a Curie temperature near the optimum operating temperature may be used to prevent overheating or maintain an optimal emission temperature. The principle for maintaining a constant temperature is the same as the heating element for heat generation mentioned above.

The light emitting plate 950 may further include a coating such as tungsten having a high melting point on the surface of the light emitting plate as shown in FIG. 4A to reduce evaporation at a high temperature.

The light emitting plate 950 may further include alumina, silicon oxide, potassium oxide, or the like in order to prevent the light emitting plate from being deformed at a high temperature.

It is preferable that the thickness of the light emitting plate 950 is thicker than 0.8 times the skin thickness so that most of the magnetic fluxes link with the light emitting plate. However, it can be made thinner than 0.8 times the thickness of the epidermis.

The surface of the light emitting plate 950 may further include an oxide such as barium for emitting hot electrons at a high temperature, and a fluorescent material may be further coated on an inner wall of the glass tube 930.

The light emitting plate 950 may have a planar shape and may have an elongated plate shape, a round circle shape, or a heart shape, depending on the purpose. In addition, the shape of the heating plate may be concave or convex depending on the purpose.

The glass tube 910 or the light emitting plate 950 may further include a material for emitting electrons to remove odor or purify the air.

As the induction coil 920, a litz wire may be used, and the litz wire may be twisted with each other to suppress generation of eddy currents from itself.

The power supply unit 910 may be a built-in inverter circuit of a semiconductor (MOSFET, IGBT, etc.) method for high efficiency, small size, light weight. In addition, the power supply 910 may be a resonant power with good efficiency.

In order to further reduce the volume of the power supply unit 910 and increase the power supply, the power supply unit 910 may have a high frequency. Specifically, it may have a frequency of 10kHz or more.

The induction heating light emitting device 900 according to the present invention may be manufactured as a replaceable light bulb or a fluorescent lamp as shown in FIGS. 15A and 15B. The light bulb and the fluorescent lamp may include a glass tube 930 and the light emitting plate 950. It may be composed of or in addition to these may be configured to include an induction coil 920. In addition, heat insulating means 960 may be further included in these.

The light bulb shown in FIG. 15A includes a glass tube 930, a light emitting plate 950, a heat insulating means 960, and an induction coil 920, and a power supply 910 is provided outside the light bulb. However, the power supply unit 910 may be further included in the bulb. And, the bulb shown in Figure 15b is composed of a glass tube 930 and the induction coil 920 and the remaining components are located outside the bulb. In addition, the heat insulating means 960 in FIG. 15 may be included in the bulb or may be included outside the bulb or both the bulb and the bulb.

A small amount of gas may be further injected into the glass tube 930 to give a unique color, and the gas may be argon, nitrogen, krypton or sodium, mercury, or the like.

The induction heating light emitting apparatus 900 according to the present invention may further include a reflecting plate 970 for reflecting the light generated from the light emitting plate 950 inside or outside the bulb.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes can be made without departing from the technical spirit of the present invention. It will be apparent to those of ordinary skill in Esau.

The heating device using induction heating according to the present invention as described above can be used for a variety of applications, since the added heating plate generates heat, which can escape from the constraint that the vessel should be a conductor unlike the existing method, and further includes a heating plate. There is no need to adjust the output power by sensing the permeability of the material, so the power circuit is simple, which can lower the price of the product.

Energy conversion efficiency is better than conventional devices using resistors, and power consumption can be reduced. Also, no harmful combustion gas is generated because oxygen is not consumed, and thus a comfortable and clean indoor environment can be maintained.

In addition, since the light emitting device using induction heating according to the present invention is not a conventional line shape using filaments but a surface shape by a light emitting plate, the light emitting efficiency can be improved and the light emitting plate can be manufactured in various forms desired by consumers. The use of a plane-shaped light emitting plate prevents disconnection due to evaporation from existing filament lines, and thus has a much longer service life.

Claims (36)

A power supply unit supplying an AC current; An induction coil through which the alternating current flows to generate alternating magnetic flux; It is heated by the alternating magnetic flux and is provided with a plate or tube-type heating element made of a ferromagnetic or ferromagnetic alloy having a high heat generating efficiency, The heating element is made of a material having a Curie temperature higher than the maximum operating temperature, The heating element is a heating device using induction heating, the thickness thereof is thicker than 0.8 times the thickness of the skin so that most of the magnetic flux is connected to the heating plate to obtain a high heat generating efficiency. The method of claim 1, Further comprising a solid plate indirectly heated by the heating plate of the plate form of the heating element, The heating plate is a heating device using induction heating, characterized in that any one selected from a plate (plate), concave or convex, curved plate. The method of claim 1, The heating element and the induction coil is divided into a plurality of cells, the heating device using induction heating, characterized in that the heating area is changed according to the selective power supply of the power supply. The method of claim 1, Further comprising a plate or tube-shaped support structure or plate-shaped top plate of the non-conductive material for supporting the heating element, The heating element is a heating device using induction heating, characterized in that fixed to the support structure or the top plate. delete The method according to any one of claims 1 to 4, When the heating element is a heating plate, The heating plate is a heating device using induction heating, characterized in that to form a plurality of plates overlap. The method according to any one of claims 1 to 4, When the heating element is a heating tube, The heating tube is a heating device using induction heating, characterized in that a plurality of tubes having different diameters overlap in concentric circles. The method according to any one of claims 1 to 4, The ferromagnetic alloy of the heating element further comprises elements such as Si, Al, C, Mn, Cu, Cr, Mo, V, W, the heating device using induction heating, characterized in that the content is 10% or less. The method according to any one of claims 1 to 4, The heating element is at least one heating layer for heating, And at least one conductive layer for conducting heat to be generated in the heating layer. The method of claim 9, The heating layer is made of a ferromagnetic or ferromagnetic alloy having a high resistance and high specific permeability, The conductive layer is a heating device using induction heating, characterized in that consisting of a low resistance and a non-magnetic conductor. The method according to any one of claims 1 to 4, Further comprising at least one magnetic shielding magnetic material made of a material such as ferrite having a high resistance and high permeability to prevent electromagnetic interference caused by the electromagnetic waves generated in the induction coil, The magnetic flux shielding magnetic material wraps the induction coil to the outside so that magnetic flux is shielded. The method according to any one of claims 1 to 4, Induction heating heating device characterized in that it further comprises a heat insulating material for protecting the induction coil from the heat generated by the heating element. The method according to any one of claims 1 to 4, The induction coil uses a Litz wire, and the Litz wire is a heating device using induction heating, characterized in that they are twisted together to suppress the occurrence of eddy currents in itself. The method according to any one of claims 1 to 4, The heating element is a heating device using induction heating, characterized in that made of an amorphous alloy to obtain a desired Curie temperature and specific permeability. The method according to any one of claims 1 to 4, The heating element is a heating device using induction heating, characterized in that it further comprises a functional coating such as a ceramic coating such that far infrared or anion or both are released together. The method according to any one of claims 1 to 4, Heating device using induction heating, characterized in that for forcibly heating the air by the heating plate further comprises a blower. The method according to any one of claims 1 to 4, And a heating element heats an object such as food or water, or heats water to generate water vapor. The method according to any one of claims 1 to 4, Further comprising a moving means for moving the heating element or the object or food for heating and the like or the object or food moving by the heat generated from the heating element or hot air or steam is heated using induction heating Heating device. The method according to any one of claims 1 to 4, The heating device using induction heating, characterized in that for supplying the radiant heat generated by the heating element to the user or the air is heated by the heating element and the room temperature is controlled by the heated air. The method of claim 19, And at least one reflector for reflecting radiant heat generated by the heating element, wherein the reflector is flat, concave or curved. A power supply unit for supplying AC current; An induction coil through which the alternating current flows to generate alternating magnetic flux; Light emitting device using induction heating, characterized in that consisting of a light emitting plate is heated by the alternating magnetic flux. The method of claim 21, The light emitting device using induction heating is characterized in that the light emitting plate and the induction coil is divided into a plurality of cells and the light emitting area varies according to the selective power supply of the power supply unit. The method of claim 21, When the frequency of the alternating magnetic flux is so high that the thickness of the light emitting plate is too thin, further comprising a support structure for supporting the light emitting plate, The light emitting device using induction heating, characterized in that the light emitting plate is supported by the support structure. The method of claim 21, Light emitting device using induction heating, characterized in that it further comprises a heat insulating means for protecting the induction coil and the like from the heat generated in the light emitting plate. The method of claim 21, A light emitting device using induction heating, characterized in that the magnetic material wraps the induction coil to the outside, further comprising a magnetic shield for magnetic flux such as ferrite to prevent electromagnetic interference generated from the induction coil. The method of claim 21, The material of the light emitting plate is a light emitting device using induction heating, characterized in that the melting point of any one of tungsten or tungsten alloy, high luminous efficiency ferromagnetic alloy, ferromagnetic and tungsten alloy. The method of claim 26, The light emitting device is a light emitting device using induction heating, characterized in that the material having a Curie temperature near the maximum operating temperature or higher than the maximum operating temperature for light emission in order to maintain the optimum light emitting temperature or to prevent overheating of the light emitting plate. The method of claim 26, The thickness of the light emitting plate is a light emitting device using induction heating, characterized in that the most magnetic flux is thicker than 0.8 times the thickness of the skin so as to bridge the light emitting plate. The method of claim 26, Light emitting device using induction heating, characterized in that the light emitting plate further comprises a thin tungsten coating on the surface of the light emitting plate to reduce the evaporation. The method of claim 26, The light emitting device is a light emitting device using induction heating, characterized in that the planar shape and the elongate plate, circular, or heart-shaped according to the purpose. The method of claim 21, The induction coil uses a litz wire, and the litz wire is a light emitting device using induction heating, characterized in that they are twisted together to suppress the generation of eddy currents in itself. The method of claim 21, The high frequency power supply unit is a light emitting device using induction heating, characterized in that the built-in inverter circuit using a high-efficiency, ultra small, lightweight and low-cost semiconductor device. The method of claim 21, Induction heating light emitting device, characterized in that it further comprises a light reflector for reflecting light. The method according to any one of claims 21 to 33, A light emitting device using induction heating, further comprising a glass tube made of a material such as quartz or glass. The method of claim 34, The light emitting device using induction heating, characterized in that the gas is further injected into the glass tube to help light emission or to protect the light emitting plate. The method of claim 34, The light emitting device using induction heating, characterized in that the surface of the light emitting plate further comprises a metal oxide for emitting hot electrons at a high temperature, the fluorescent material is further coated on the surface of the glass tube.

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