JP2001332375A - Induction heating cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an induction heating cooker in which displacement and floating of the heated pair from the face of cooler or the like due to a buoyancy owing to a repulsive magnetic field are made less. SOLUTION: In the induction heating cooler having an induction heating coil 8 connected with a high frequency inverter 7, and cooking pan 9, wherein the cooking is made by induction heating of the cooking pan 9 by a high frequency magnetic field generated from the induction heating coil 8, the detection is performed by electric means of power supply current detecting circuit 13 or the like, and the displacement and floating inhibitory control of the cooking pan 9 are conducted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction heating cooker used in ordinary households.

[0002]

2. Description of the Related Art In an induction heating cooker, a high-frequency magnetic field is generated from an induction heating coil, and an object to be heated such as a pan is heated by eddy currents caused by electromagnetic induction.

Hereinafter, an example of a conventional induction heating cooker will be described with reference to FIG. In the figure, 1 is a high-frequency inverter, 2 is an induction heating coil connected to the high-frequency inverter 1, and 3 is a cooking pot.

As shown in this configuration, a high-frequency magnetic field is generated from the induction heating coil 2 by a high-frequency current supplied by the high-frequency inverter 1, and the cooking pot 3 is heated by an eddy current due to electromagnetic induction.

[0005]

In the above-mentioned conventional construction, especially when the cooking pot 3 is made of a non-magnetic metal, buoyancy acts on the cooking pot 3 due to a repulsive magnetic field, and the cooking pot 3 is heated. Depending on the weight, displacement due to buoyancy and lifting from the mounting surface may occur. FIG. 15 shows an example of the correlation between input power and buoyancy when the cooking pot 3 made of a non-magnetic metal is heated. In the graph of FIG. 15, the horizontal axis represents input power, and the vertical axis represents buoyancy. With the increase in input power,
The buoyancy also increases, and if it exceeds the weight of the cooking pot, it shifts and floats.

[0006] Japanese Patent Application Laid-Open Nos. 61-128492 and 62-276787 relate to control of displacement and floating of a cooking pot using a weight sensor. Had a control that could not be heated.

Therefore, the present invention solves the above-mentioned conventional problems, and performs detection by an electric means to perform shift control of a cooking pot and floating control. It is an object of the present invention to provide an induction heating cooker configured to limit floating.

[0008]

In order to solve the above-mentioned problems, the present invention comprises a high-frequency inverter, an induction heating coil connected to the high-frequency inverter, a power supply current detection circuit, and the like. The displacement and floating of the cooking pot are detected based on the inclination of the change.

[0009]

DETAILED DESCRIPTION OF THE INVENTION The invention according to claim 1 has a high-frequency inverter, an induction heating coil connected to the high-frequency inverter, and a power supply current detection circuit. , An induction heating cooker that detects floating. According to this configuration, the cooking pot displacement, the inclination of the change in the power supply current due to floatation is detected, and heating stop, control of input power reduction, and the like are performed. Can be provided.

According to a second aspect of the present invention, there is provided a high-frequency inverter, an induction heating coil connected to the high-frequency inverter, and the induction heating coil current detection circuit. And an induction heating cooker for detecting the temperature. According to this configuration, the inclination of the induction heating coil current change caused by the displacement of the cooking pot and the change in the coupling between the cooking pot and the induction heating coil due to the floatation is detected, and the cooking is controlled by controlling heating stop, input power reduction and the like. It is possible to provide an induction heating cooker in which displacement and lifting of a pot are reduced.

According to a third aspect of the present invention, there is provided an induction heating system comprising a high-frequency inverter, an induction heating coil connected to the high-frequency inverter, and the cooking pan position detecting circuit based on light, for detecting a shift or a floating of the cooking pan. It shall be a cooker. According to this configuration, it is possible to provide an induction heating cooker in which the displacement and lifting of the cooking pot are reduced by detecting the displacement and lifting of the cooking pot and controlling the stop of heating and the reduction of input power.

According to a fourth aspect of the present invention, there is provided a high-frequency inverter, an induction heating coil connected to the high-frequency inverter, a weight sensor for detecting the weight of the cooking pot, and a weight detection circuit connected to the weight sensor. In addition, the induction heating cooker detects displacement and floating of the cooking pan due to a change in the weight of the cooking pan. According to this configuration, there is provided an induction heating cooker that detects the buoyancy of the cooking pot based on a change in the weight of the cooking pot and controls the stop of heating, a reduction in input power, and the like, thereby reducing the displacement and lifting of the cooking pot. I can do it.

According to a fifth aspect of the present invention, there is provided a high-frequency inverter, an induction heating coil connected to the high-frequency inverter, a cooking pot, a weight sensor for detecting a weight of the induction heating coil, and a weight sensor connected to the weight sensor. A weight detecting circuit for detecting a shift or a floating of the cooking pot due to a change in the weight of the induction heating coil.
According to this configuration, induction heating cooking that detects the stress acting on the induction heating coil with respect to the buoyancy acting on the cooking pot and controls the stop of heating, reduction of input power, etc., to reduce the displacement and floating of the cooking pot. Vessels can be provided.

According to a sixth aspect of the present invention, there is provided an induction heating cooker having a high-frequency inverter and an induction heating coil connected to the high-frequency inverter, and mechanically holding a cooking pot. According to this configuration, it is possible to provide an induction heating cooker in which the cooking pot does not shift or float.

According to a seventh aspect of the present invention, there is provided a high-frequency inverter, an induction heating coil connected to the high-frequency inverter, and a groove, a concave portion, or a convex portion on the cooking pot mounting surface.
An induction heating cooker that restricts the movement of the cooking pot by the groove, the concave portion, or the convex portion. This 8th
According to the means of (1), it is possible to make the displacement and floating of the cooking pot less than a predetermined amount.

The invention according to claim 8 is an induction heating cooker having a high-frequency inverter, an induction heating coil connected to the high-frequency inverter, and a movable portion such as a spring, wherein the induction heating coil is held by the movable portion. Container. According to the configuration, the stress acting on the induction heating coil with respect to the buoyancy acting on the cooking pot is reduced or eliminated,
It is possible to provide an induction heating cooker in which the cooking pot is not displaced or lifted.

[0017]

(Embodiment 1) Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. In FIG. 1, 7
Is a high frequency inverter, 8 is an induction heating coil connected to the high frequency inverter 7, 9 is a cooking pot, and 13 is a power supply current detection circuit.

In the above configuration, especially when the cooking pot 9 is made of a non-magnetic metal, buoyancy acts on the cooking pot 9 due to a repulsive magnetic field against induction heating. However, in the present embodiment, the shift and floating of the cooking pot 9 can be reduced by detecting a change in the power supply current and performing predetermined control.

The graph of FIG. 2 shows, as an example, changes in input power and power supply current at the start of heating. As the input power increases, the power supply current increases. The cooking pot 9
When the buoyancy acts on and shifts or floats, the distance from the induction heating coil 8 decreases, so that the input power decreases and the slope of the change in the power supply current decreases. The power supply current detection circuit 1
In step 3, the inclination of the change in the power supply current is detected, and the control such as stopping the heating and reducing the input power can reduce the displacement and floating of the cooking pot 9.

(Embodiment 2) Next, a second embodiment of the present invention will be described with reference to the drawings. In FIG. 3, 1
4 is a high frequency inverter, 15 is the high frequency inverter 1
An induction heating coil connected to 4 is provided, 16 is a cooking pot, and 20 is the induction heating coil 15 and a current detection circuit.

In the above configuration, as shown in the example of the graph of FIG. 4, the induction heating coil 15 caused by a change in the coupling between the cooking pan 16 and the induction heating coil 15 due to the displacement and floating of the cooking pan 16. By detecting the gradient of the current change and controlling the stop of the heating, the reduction of the input power, and the like, the displacement and the floating of the cooking pot 16 can be reduced.

(Embodiment 3) Next, a third embodiment of the present invention will be described with reference to the drawings. In FIG. 5, 2
1 is a high frequency inverter, 22 is the high frequency inverter 2
1, an induction heating coil, 23 is a cooking pot, 27 is an optical sensor, and 28 is a position detecting circuit connected to the optical sensor 27.

In the above configuration, the position detecting circuit 28
Accordingly, the shift and floating of the cooking pot 23 can be reduced by detecting the shift and floating of the cooking pot 23 and controlling the stop of heating and the reduction of the input power.

(Embodiment 4) Next, a fourth embodiment of the present invention will be described with reference to the drawings. The graph in FIG.
The correlation between input power and buoyancy when heating a cooking pot made of non-magnetic metal is shown. In the graph, the horizontal axis represents input power, and the vertical axis represents buoyancy. As is clear from the graph, the higher the induction heating frequency, the smaller the buoyancy generated in the cooking pot. According to experiments by the inventors, f ≧ 0.035P /
By setting N, the weight of the cooking pot increases with respect to buoyancy,
The cooking pot does not shift or float. Here, f is the induction heating frequency [kHz], N is the minimum weight [kg] of the cooking pan design,
P is the rated input power [W].

(Embodiment 5) Next, a fifth embodiment of the present invention will be described with reference to the drawings. In FIG. 7, 2
9 is a high frequency inverter, 30 is the high frequency inverter 2
9, an induction heating coil, 31 is a cooking pot, 35 is a weight sensor, and 36 is a weight detection circuit connected to the weight sensor 35.

In the above configuration, it is possible to detect a change in the weight of the cooking pot 31 caused by a shift or floating of the cooking pot 31. The graph of FIG. 8 shows, by way of example, changes in the input power and the output of the weight sensor 35 at the start of heating. As the input power increases, the cooking pot 3
Since the buoyancy acting on 1 also increases, the output of the weight sensor 35 decreases. When the cooking pan 31 shifts and floats, the slope of the output change of the weight sensor 35 increases,
Displacement and floating of the cooking pot 31 can be detected.
Based on this detection result, the shift and floating of the cooking pot 31 can be reduced by controlling heating stop, input power reduction, and the like.

(Embodiment 6) Next, a sixth embodiment of the present invention will be described with reference to the drawings. In FIG. 9, 3
7 is a high frequency inverter, 38 is the high frequency inverter 3
7, an induction heating coil, 39 is a cooking pot, 43 is a weight sensor, and 44 is a weight detection circuit connected to the weight sensor 43.

The weight sensor 43 detects the weight of the induction heating coil 38.

In the above configuration, the stress acting on the induction heating coil 38 with respect to the buoyancy generated in the cooking pot 39 can be detected. The graph of FIG. 10 is an example.
3 shows changes in input power and the output of the weight sensor 43 at the start of heating. As the input power increases, the buoyancy acting on the cooking pot 39 increases, and the stress acting on the induction heating coil 38 also increases. When the cooking pan 39 shifts and floats, the inclination of the output change of the weight sensor 43 becomes small, and it is possible to detect the shift and floating of the cooking pan 39. Based on this detection result, it is possible to reduce the displacement and floating of the cooking pot 39 by controlling heating stop, input power reduction, and the like.

(Embodiment 7) Next, a seventh embodiment of the present invention will be described with reference to the drawings. In FIG.
45 is a high frequency inverter, 46 is an induction heating coil connected to the high frequency inverter 45, 47 is a cooking pot, 51
Is composed of mechanical holding means.

The cooking pot 47 is provided with the mechanical holding means 5.
The position is fixed by 1.

In the above configuration, since the position of the cooking pot 47 is fixed by the mechanical holding means 51, no displacement due to buoyancy and no lifting from the mounting surface occur.

In the embodiment shown in this embodiment, the shape of the mechanical holding means 51 is not limited.

(Embodiment 8) Next, an eighth embodiment of the present invention will be described with reference to the drawings. In FIG.
52 is a high frequency inverter, 53 is an induction heating coil connected to the high frequency inverter 52, and 54 is a cooking pot.

A recess 58 is provided on the surface on which the cooking pot 55 is placed.

In the above configuration, even when the cooking pot 54 is buoyant due to a repulsive magnetic field with respect to the induction heating and the cooking pot 54 is displaced, the concave portion 58 is formed.
Since the amount of movement of the cooking pot 54 is restricted by this, the displacement can be reduced.

The embodiment shown in this embodiment does not limit the shape of the concave portion 58 but may be a groove or a convex portion.

Embodiment 9 Next, a ninth embodiment of the present invention will be described with reference to the drawings. In FIG.
59 is a high frequency inverter, 60 is an induction heating coil connected to the high frequency inverter 59, and 61 is a cooking pot.

The induction heating coil 60 is held by a movable part 65 such as a spring.

In the above configuration, when buoyancy is generated in the cooking pot 61 due to a repulsive magnetic field with respect to induction heating,
A stress is generated in the induction heating coil 60 in the direction of gravity. However, since the induction heating coil 60 is held by the movable portion 65, the position of the induction heating coil 60 moves in the direction of gravity according to the stress. As a result, the buoyancy is absorbed by the movement of the induction heating coil 60, so that the cooking pot 61 does not shift or float.

[0041]

As described above, according to the present invention, the shift of the cooking pot is detected by detecting the shift of the cooking pot and the change of the power supply current due to the float, and controlling the stop of the heating and the reduction of the input power. An induction heating cooker capable of suppressing floating can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an induction heating cooker according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a change over time of input power and power supply current.

FIG. 3 is a schematic configuration diagram of an induction heating cooker according to a second embodiment of the present invention.

FIG. 4 is a diagram showing a change over time in input power and coil current.

FIG. 5 is a schematic configuration diagram of an induction heating cooker according to a third embodiment of the present invention.

FIG. 6 is a diagram showing a correlation between input power and buoyancy in Embodiment 4 of the present invention.

FIG. 7 is a schematic configuration diagram of an induction heating cooker according to a fifth embodiment of the present invention.

FIG. 8 is a diagram showing a change over time of the input power and the weight sensor output.

FIG. 9 is a schematic configuration diagram of an induction heating cooker according to a sixth embodiment of the present invention.

FIG. 10 is a diagram showing changes over time in input power and weight sensor output.

FIG. 11 is a schematic configuration diagram of an induction heating cooker according to a seventh embodiment of the present invention.

FIG. 12 is a schematic configuration diagram of an induction heating cooker according to an eighth embodiment of the present invention.

FIG. 13 is a schematic configuration diagram of an induction heating cooker according to a ninth embodiment of the present invention.

FIG. 14 is a schematic configuration diagram of a conventional induction heating cooker.

FIG. 15 is a diagram showing a correlation between input power and buoyancy.

[Explanation of symbols]

 7 High frequency inverter 8 Induction heating coil 9 Cooking pot 13 Power supply current detection circuit

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H05B 6/12 331 H05B 6/12 331 (72) Inventor Izumi Hirota 1006 Kazuma Kadoma, Kadoma City, Osaka Matsushita Inside Electric Industrial Co., Ltd. (72) Inventor Hideki Omori 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. F-term (reference) 3K051 AA02 AA08 AB02 AB04 AC07 AC37 AC39 AD09 AD39 BD16

Claims (8)

[Claims] 1. A high-frequency inverter, an induction heating coil connected to the high-frequency inverter, and a power supply current detection circuit, which detects a shift or a floating of a cooking pot to be heated by an inclination of a change in a power supply current. Induction heating cooker. 2. A high-frequency inverter, an induction heating coil connected to the high-frequency inverter, and the induction heating coil current detection circuit. Induction heating cooker that detects floating. 3. A high-frequency inverter, an induction heating coil connected to the high-frequency inverter, and an optical sensor, wherein a position detection circuit connected to the optical sensor shifts and floats a cooking pot as an object to be heated. Induction cooker that detects 4. A cooking pot having a high-frequency inverter, an induction heating coil connected to the high-frequency inverter, a weight sensor for detecting the weight of the cooking pot, and a weight detection circuit connected to the weight sensor. An induction heating cooker that detects the shift or floating of a cooking pot that is the object to be heated due to changes. 5. A high-frequency inverter, an induction heating coil connected to the high-frequency inverter, a weight sensor for detecting a weight of the induction heating coil, and a weight detection circuit connected to the weight sensor, An induction heating cooker that detects a shift or floating of a cooking pot, which is an object to be heated, due to a change in the weight of the induction heating coil. 6. An induction heating cooker having a high-frequency inverter, an induction heating coil connected to the high-frequency inverter, and mechanical holding means, wherein a cooking pot to be heated is held by the mechanical holding means. . 7. A high-frequency inverter, an induction heating coil connected to the high-frequency inverter, and a groove, a concave portion, or a convex portion provided on the cooking pot mounting surface, wherein the groove, the concave portion, or the convex portion is provided. An induction heating cooker that restricts the movement of a cooking pot, which is an object to be heated. 8. An induction heating cooker having a high-frequency inverter, an induction heating coil connected to the high-frequency inverter, and a movable portion such as a spring, wherein the induction heating coil is held by a movable portion such as a spring.