JPH04341790A - High frequency induction heating cooker - Google Patents

Abstract

PURPOSE:To provide a high-frequency induction heating cooking appliance which has heating properties of a conventional electromagnetic cooking appli ance and is able to carry out heating from the upper side. CONSTITUTION:An electricity receiving coil 7 to receive electromagnetic induction of an induction heating coil 3 and a heating part 8 to which electricity is applied by the electricity receiving coil 7 are installed in a cover 6 and besides the induction heating coil 3, an electricity supplying coil 3a on the opposite to the electricity receiving coil 7 is installed and an electric power source 4 is used in common for the induction heating coil 3 and the electricity supplying coil 3a. The cover 6 is made freely detachable and a temperature adjustor 9 to adjust the heating temperature of the electricity receiving coil 7 and the heating part 8 is provided, No contact electric supply to the electricity receiving coil is carried out to heat cooking ingredients from upper side and the variety of cookings for which an oven and a grill are usable are widened using the appliance.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high frequency induction heating cooker, and more particularly, to a high frequency induction heating cooker which utilizes high frequency induction heating to add an oven/grill function.

0002

2. Description of the Related Art Electromagnetic cookers, which are placed on a dining table or the like and cook ingredients by generating heat in a cooking container using high-frequency induction heating, are widely used in ordinary households.

FIG. 9 is a sectional view of a conventional electromagnetic cooker. In the figure, 1 is a cooking container made of, for example, an iron-based metal material with high resistivity and high relative magnetic permeability, and 2 is a mounting part on which the cooking container 1 is placed. Made of transparent material. 3 is an induction heating coil, and 4 is a high frequency switching power supply section. This high-frequency switching power supply section 4 is a voltage resonance type switching power supply using one transistor, and after full-wave rectification, it chops at a frequency of 20 to 30 KHz to obtain a high frequency, and this high-frequency current energizes the induction heating coil 3. be done. 5 is a main body, and an induction heating coil 3 is disposed inside thereof.

[0004] In such an electromagnetic cooker, a cooking container 1 containing cooking ingredients is placed on a placing part 2, and a high frequency switching power supply part 4 applies 20 to 30 KHz to an induction heating coil 3.
When a high frequency current is applied, an eddy current is generated on the surface of the cooking container 1, and the cooking container 1 generates heat due to Joule heat caused by the eddy current, and the cooking material is cooked.

[0005]

[Problems to be Solved by the Invention] As described above, the conventional electromagnetic cooker has a high overheating efficiency of about 85%, and the cooking container 1 is limited to iron-based metal materials such as pots and frying pans. For example, cooking such as ``boiling'' and ``browning'' can be performed with high efficiency, saving labor in housework. However, the cooking ingredients are heated only from the bottom, and moreover, from the side in contact with the cooking container 1, that is, from one side, and cooking from the entire surface like oven cooking is not possible, and the type of cooking is different. It was limited.

The present invention was made to solve the above-mentioned problems, and provides a high-frequency induction cooking device that has the heating characteristics of a conventional electromagnetic cooker and can perform radiant heating from above. The purpose is to provide utensils.

[0007]

[Means for Solving the Problems] A high-frequency induction heating cooker according to the present invention includes a cooking container housed in a cooking device main body whose upper part is covered with a lid, a placing portion for placing the cooking container, and a cooking device. In a high-frequency induction heating cooker that includes a heating means for inductively heating a container and a power supply section, a power receiving coil that receives electromagnetic induction of an induction heating coil that constitutes the heating means in a lid, and a heating section that is energized by the power receiving coil. It has been established that In addition to the induction heating coil constituting the heating means, a power feeding coil is provided facing the power receiving coil. Furthermore, the induction heating coil and the power supply coil constituting the heating means are configured to share a power supply section. Further, the lid is configured to be detachable, or a temperature controller is provided to adjust the heating temperature of the power receiving coil and heating section provided in the lid.

[0008]

[Operation] Place the cooking container on the mounting section of the cooking device equipped with induction heating means, cover with the lid, and turn on the power. The induction heating means is energized to generate heat in the cooking container, and at the same time, the power receiving coil receives electromagnetic induction from the power feeding coil and energizes the heating section disposed within the lid. Then, the cooking material is cooked from both upper and lower sides using the induction heating means and the heating section. Moreover, since the lid is configured to be detachable, the lid can be removed and cooking can be carried out in the same manner as before. Furthermore, a temperature regulator is provided inside the lid, and cooking is performed while adjusting the heating temperature of the power receiving coil and the heating section.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic cross-sectional view of an embodiment of the present invention, and FIG. 2 is an electrical circuit diagram of the embodiment of FIG.

In the figure, 1 is a cooking container made of, for example, a magnetic material with high resistivity and high relative magnetic permeability, and 2 is a mounting part on which the cooking container 1 is placed, and is made of heat-resistant material such as ceramic and transmits electromagnetic waves. Composed of materials. 3 is an induction heating coil that inductively heats the cooking container 1; 3a is a power feeding coil that feeds power to a power receiving coil 7 (described later); 4 is a high-frequency switching power source; 5 is a main body with an induction heating coil in the part facing the placing part 2; 3 and a feeding coil 3a are arranged, and both coils 3, 3a are controlled to be energized by a high frequency switching power supply section 4. Reference numeral 6 denotes a removable top lid; 7 a power receiving coil disposed inside the top lid 6 facing the power feeding coil 3a; 8 a heating element provided in the top lid 6; It is arranged so as to cover it, and is energized by the power receiving coil 7. Reference numeral 9 denotes a temperature regulator provided inside the upper lid 6, which controls the supply of electricity from the power receiving coil 7 to the heating element 8 to adjust the temperature. 10 is a cooking material.

The high frequency switching power supply section 4 is composed of a rectifier 11, a smoothing capacitor 12, a transistor 13 serving as a switching element, a resonant capacitor 14, a regenerative diode 15, a coil switching relay 16, and a high frequency power supply control section 17. There is.

The high frequency current is generated as follows. The commercial power supply is full-wave rectified by a rectifier 11, smoothed by a smoothing capacitor 12, and then turned on and off by a transistor 13. At this time, the induction heating coil 3, the power supply coil 3a, and the resonance capacitor 14 are set to values that maintain resonance conditions. The regenerative diode 15 serves to bypass the current flowing backward when the transistor 13 is blocked, and the current is supplied by changing the frequency or duty cycle by the high frequency power supply control section 17.

Next, the operation of the present invention will be explained. First, the cooking material 10 is put into the cooking container 1, placed on the placing part 2, and covered with the top lid 6. Next, the power supply (not shown) is turned on, and the relay 16 connects the induction heating coil 3 and the power supply coil 3a.
When electricity is alternately applied to the high frequency switching power supply section 4,
is 20 to 50 to the induction heating coil 3 and power supply coil 3a.
A high frequency current of approximately KHz is alternately applied. Magnetic flux is generated by excitation of the induction heating coil 3, and an alternating eddy current flows in the cooking vessel 1 due to electromagnetic induction, generating Joule heat.
The cooking container 1 rapidly generates heat. At this time, a voltage is induced in the power receiving coil 7 in the upper lid 6 by electromagnetic induction from the power feeding coil 3a, and the heating element 8 is heated by electricity. In this way, the cooking material 10 is heated and cooked from both the upper and lower sides while controlling the high frequency current and heating temperature to be supplied by the high frequency switching power supply section 4 and the temperature controller 9.

[0014] In the above-mentioned embodiment, the case where power is supplied to the power receiving coil 7 by the separately provided power supply coil 3a has been explained as an example, but the power supply coil 3a is omitted and the induction heating coil 3 is used instead. Alternatively, power may be supplied to the power receiving coil 7. In addition, since the relay 16 can supply appropriate power to the induction heating coil 3 and the power feeding coil 3a, for example, when frying fish, the relay 16 is connected to the power feeding coil 3a side and the feeding coil 3a, that is, the power receiving coil 7 When all power is supplied to the heating element 8 via the relay 16 to bake cakes, bread, etc., 60% is supplied to the induction heating coil 3 by the relay 16, and 40% is supplied to the power supply coil 3a, that is, the heating element 8.
Cooking can be done well if electricity is applied at a rate of about 100%.

Furthermore, when the upper lid 6 is removed and the large cooking container 1a is placed on the mounting portion 2 as shown in FIG.
Cook by induction heating a.

FIG. 4 is another electrical circuit diagram of an embodiment of the present invention, in which the relay 16 of FIG. 2 is omitted and the induction heating coil 3 and the power supply coil 3a are connected in series. In this embodiment, the balance of power supply to the induction heating coil 3 and the power feeding coil 3a is set in advance by the distribution of the coils and the capacity of the heating element 8, and the cooking vessel is heated by the electromagnetic induction effect explained in the embodiment of FIG. 1 and a heating element 8 are heated to cook the cooking material 10 in the cooking container 1.

FIG. 5 is a schematic cross-sectional view of another embodiment of the invention. In the figure, 18 is an induction heating coil arranged in place of the heating element 8 in FIG. For example, it is arranged on the hot plate 19 so that it can be heated more uniformly than a sheathed heater. Even in this embodiment configured as described above, when the cooking container 1 is placed on the placing part 2 and the top lid 6 is placed on it and the power is turned on, the cooking container 1 is moved by the electromagnetic induction effect explained in the embodiment of FIG. I get a fever. At the same time, from the power feeding coil 3a to the power receiving coil 7
The high frequency current combined with is applied to the induction heating coil 18, and the hot plate 19 also generates heat, thereby heating and cooking the cooking material 10 from both the upper and lower sides.

FIG. 6 is a schematic cross-sectional view of still another embodiment of the present invention, and FIG. 7 is an enlarged view of its main parts, which improves the degree of coupling between the power feeding coil 3a and the power receiving coil 7 in FIG. It is something. In this embodiment, the feeding coil 3a
is composed of a close-wound multilayer coil 20 and a high permeability ferrite core 21 that increases magnetic flux density, and the receiving coil 7 is also composed of a close-wound multilayer coil 22 and a ferrite core 23 in the same way as the power supply coil 3a. Although the power feeding coil 3a and the power receiving coil 7 are separated by, for example, about 4 mm by the main body 5 and the upper cover 6, the transmission efficiency is as high as 95%. In addition, as shown in FIG. 8, the power feeding coil 3a and the power receiving coil 7 may be configured to be small and flat. Reference numeral 24 denotes a halogen heater having high radiation efficiency characteristics. Power on to the halogen heater 24 can be soft-started by variable frequency control of the high-frequency switching power supply section 4, and measures against inrush current at the time of power on are taken.

Also in this embodiment constructed as described above, the cooking vessel 1 is moved by the electromagnetic induction effect explained in the embodiment of FIG.
generates heat, and at the same time, the high-frequency current coupled from the power feeding coil 3a to the power receiving coil 7 is applied to the halogen heater 24 to heat and cook the cooking material 10 from both the upper and lower sides.

[0020]

As described above, in this invention, a power receiving coil receiving electromagnetic induction of an induction heating coil constituting the heating means and a heating section energized by the power receiving coil are provided in the lid, and furthermore, a power receiving coil and a heating section are provided. Since a temperature controller is provided to adjust the heating temperature of the heating section, contactless power supply to the receiving coil by the induction heating coil can be performed, and cooking materials can be radiantly heated not only from the bottom but also from the top. It also enables fine-grained control of heating temperature, etc., and expands the range of cooking types that can be used, such as oven and grill cooking.

Furthermore, since a feeding coil is provided which is disposed opposite to the receiving coil separately from the induction heating coil constituting the heating means, the coupling ratio between the feeding coil and the receiving coil is improved, and the power transmission efficiency is also improved. The higher the temperature, the more effective cooking can be done. In addition, since the lid is configured to be detachable, it can be used as a stove for everyday use if the top lid is removed, and is also easy to clean.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view of an embodiment of the present invention.

FIG. 2 is an electrical circuit diagram of the embodiment of FIG. 1;

FIG. 3 is a schematic diagram when a large cooking container is placed.

FIG. 4 is another electrical circuit diagram of the embodiment of the invention.

FIG. 5 is a schematic cross-sectional view of another embodiment of the present invention.

FIG. 6 is a schematic cross-sectional view of still another embodiment of the present invention.

FIG. 7 is an enlarged view of the main part of FIG. 6;

8 is another enlarged view of the main part of FIG. 7. FIG.

FIG. 9 is a cross-sectional view of a conventional electromagnetic cooker.

[Explanation of symbols]

1 Cooking container 2 Placement section 3,18 Induction heating coil 3a　Power supply coil 4 High frequency switching power supply section 5 Main body 6 Top lid 7 Power receiving coil 8 Heating element 9 Temperature controller 16 Relay 19 Hot plate 20, 22 Closely wound multilayer coil 21, 23 Ferrite core 24 Halogen heater

Claims (5)

[Claims] 1. A cooking container housed in a cooking device main body whose upper part is covered with a lid, a mounting section on which the cooking container is placed, heating means for induction heating the cooking container, and a power supply section. A high frequency induction heating cooker comprising: a power receiving coil receiving electromagnetic induction of an induction heating coil constituting the heating means; and a heating section energized by the power receiving coil, disposed in the lid. Induction heating cooker. 2. The high-frequency induction heating cooker according to claim 1, further comprising a power feeding coil disposed opposite to the power receiving coil in addition to the induction heating coil constituting the heating means. 3. The high-frequency induction heating cooker according to claim 1, wherein the induction heating coil constituting the heating means and the power source section of the power feeding coil are commonly used. 4. The high-frequency induction heating cooker according to claim 1, wherein the lid is configured to be detachable. 5. The high-frequency induction heating cooker according to claim 1, further comprising a temperature controller for adjusting the heating temperature of the power receiving coil and the heating section provided in the lid.