JP2562276Y2 - Induction heating device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a plurality of heating coils provided adjacent to a single object to be heated, switching means for applying a high-frequency current to each of the heating coils, and the switching means. The present invention relates to an induction heating device including a driving circuit to be driven and heating output setting means for varying individual heating outputs of the heating coil.

[0002]

2. Description of the Related Art An example of a conventional induction heating apparatus will be described with reference to FIGS. In the conventional induction heating apparatus, a top plate 13 on which an iron plate 12 as an object to be heated is provided on an upper surface of an apparatus main body 11, and an inner heating coil 14 and an outer heating coil 15 are provided on a back surface of the top plate 13. The heating coil is provided, and a thermistor 16 for detecting the temperature of the iron plate 12 is provided at the center of the inner heating coil 14.

[0003] A heating ratio setting volume 1 for setting the ratio of the heating output of the inner heating coil 14 to the heating output of the outer heating coil 15 is provided on a side surface of the apparatus main body 11.
7 and a total output setting volume 18 for setting the total heating output of the inner heating coil 14 and the outer heating coil 15.

When the heating ratio setting volume 17 is operated to the right in the figure, the outer heating coil 15 is moved.
Is higher than the heating output of the inner heating coil 14, and the heating ratio is adjusted so that the heating output of the inner heating coil 14 becomes larger than the heating output of the outer heating coil 15 by operating the left side of the drawing. Was to set.

In the above induction heating apparatus, when the heating ratio of the inner heating coil 14 and the outer heating coil 15 is heated at the same heating ratio by the heating ratio setting volume 17, “strong” heating is performed by the total output setting volume 18. Is set, for example, the heating output of 13000 W is divided into the inner heating coil 14 and the outer heating coil 15 due to the limit of the current capacity of the general household outlet, and the heating output of one heating coil is 750 W Becomes the iron plate 12
Temperature of consuming T ₀ hours as indicated by the broken line in FIG. 5 for a predetermined temperature, for example 200 ° C., could not be immediately raised to a predetermined temperature.

[0006] When it is desired to quickly raise the temperature of the central portion of the iron plate 12 to a predetermined temperature when performing grilled meat dishes or the like,
By operating the heating ratio setting volume 17 to maximize the heating output of the inner heating coil 14, the total output setting volume 18 is operated to “strong” heating to raise the temperature of the central portion of the iron plate 12. I was

[0007]

With the induction heating device having the above structure, when it is desired to quickly raise the temperature of the central portion of the iron plate 12 (the object to be heated), the heating ratio setting volume 17 and the total output setting volume are used. 18 has to be operated, and a troublesome operation for the user is always required.

[0008] The present invention has been made in view of the above-described problems, and it is possible to set the heating output of each heating coil by a simple operation when it is desired to quickly raise the temperature of the central portion of the object to be heated. It is an object to provide an induction heating device.

[0009]

In order to achieve the above object, an induction heating apparatus according to the present invention is provided with a plurality of heating coils adjacent to each other for a single object to be heated. A switching means for supplying a high-frequency current is provided, a drive circuit for driving the switching means is provided, and a heating output setting means for varying the individual heating output of the heating coil is provided, regardless of a set value by the heating output setting means. And a heating switch for increasing the heating output of a specific heating coil among the above-mentioned heating coils by a certain value as compared with the heating output of the other heating coils.

[0010]

When the heating switch is operated, the heating output of the specific heating coil among the heating coils is constant as compared with the heating output of the other heating coils regardless of the set value of the heating output setting means. By increasing the value, the temperature of the portion of the object to be heated which is heated by this specific heating coil rises quickly.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the induction heating apparatus according to the present invention will be described with reference to FIGS. The induction heating device of the present invention
A top plate 13 on which an iron plate 12 to be heated is placed is provided on an upper surface of the apparatus main body 11, and an inner heating coil 14 and an outer heating coil 15 are provided on the back surface of the top plate 13.
A plurality of heating coils are provided, and a thermistor 16 for detecting the temperature of the iron plate 12 is provided at the center of the inner heating coil 14.

A heating ratio setting volume 1 for setting a ratio of a heating output of the inner heating coil 14 to a heating output of the outer heating coil 15 is provided on a side surface of the apparatus main body 11.
7 and a total output setting volume 18 for setting the total heating output of the inner heating coil 14 and the outer heating coil 15, regardless of the set value by the heating ratio setting volume 17. The heating output of the inner heating coil 14 is controlled to be larger than the heating output of the outer heating coil 15 by a certain value (for example, the heating output of the inner heating coil 4 is twice the heating output of the outer heating coil 15), and the total output setting is performed. "High" regardless of the setting value of volume 18
A heating switch 1 for controlling heating is provided.

As shown in FIG. 2, in the induction heating apparatus of the present invention, a series circuit of an inner heating coil 14 and a damper diode 3 is connected to a commercial power source 2, and a resonance capacitor 4 and the inner heating coil are connected to the series circuit. 14 is connected in parallel with a series circuit of a transistor 5 which is a switching element for supplying a high-frequency current, and connects a connection point between the inner heating coil 14 and the damper diode 3 and a connection point between the resonance capacitor 4 and the transistor 5. The drive circuit 6 is connected to the base of the transistor 5.

An external heating coil 1 is connected to the commercial power source 2.
5 and a series circuit of a damper diode 7, and a series circuit of a resonance capacitor 8 and a transistor 9 as a switching element for supplying a high-frequency current to the outer heating coil 15 are connected in parallel to the series circuit. The connection point between the heating coil 15 and the damper diode 7 and the connection point between the resonance capacitor 8 and the transistor 9 are connected, and the drive circuit 6 is connected to the base of the transistor 9.

The drive circuit 6 is connected to a control circuit 10 for controlling the energization of the inner heating coil 14 and the outer heating coil 15 via the drive circuit 6.
The heating switch 1, the thermistor 16, the heating ratio setting volume 17, and the total output setting volume 18 are connected to 0 respectively.

The operation of the induction heating apparatus having the above configuration will be described. First, the heating ratio setting volume 17 is operated to set the heating ratio between the inner heating coil 14 and the outer heating coil 15, and the total output setting volume 18 is operated to operate the inner heating coil 14 and the outer heating coil 15. The heating is started by setting the total output with the number 15 to any of "weak" to "strong".

The control circuit 10 outputs a control signal to the drive circuit 6 based on the heating ratio set by the heating ratio setting volume 17, and the drive circuit 6 outputs a drive signal corresponding to the control signal. The rate of conduction to the inner heating coil 14 and the outer heating coil 15 is controlled.

For example, the heating ratio setting volume 1
7 is operated to the right end, only the outer heating coil 15 is heated, and when operated to the center, the inner heating coil 14 is heated.
The heating ratio between the heating coil 15 and the outside heating coil 15 is set to the same heating ratio, and when the operation is performed at the left end, the heating is controlled so that only the inside heating coil 14 is heated.

The total output setting volume 1
The control circuit 9 outputs a control signal to the drive circuit 6 based on the output set in step 8, and the drive circuit 6 outputs a drive signal in accordance with the control signal so that the inner heating coil 14 and the outer heating coil 15 is controlled.

For example, the heating ratio setting volume 1
7 is set to the inner heating coil 14 and the outer heating coil 15
If the heating ratio of the total heating setting volume 18 is “high” (maximum output 1300 W), the heating output of the inner heating coil 14 is 520 W and the outer heating coil is The heating output of No. 15 is controlled to be 680 W.

Next, the heating switch 1 is operated to heat the point A at the center of the iron plate 12 of a grilled meat dish or the like to a predetermined temperature (for example, 200 ° C.) and to heat the temperature of the surrounding point B to a temperature lower than the temperature of the center. Then, by operating the heating switch 1, the control circuit 10 causes the inner heating coil 14 and the outer heating coil 1 to operate regardless of the set values set by the heating ratio setting volume 17 and the total output setting volume 18.
The heating ratio is set to a heating ratio of 2: 1 (the heating output of the inner heating coil 14 is twice the heating output of the outer heating coil 15), and the heating output is set to the "strong" heating output to perform heating.

The heating control by the heating switch 1 is performed for a predetermined time T _2, and when the predetermined time T ₂ elapses, the heating control of the heating switch 1 is released, and the heating ratio setting volume 17 and the total output setting volume 18 are released. The heating is controlled by the set values respectively set in the steps (a) and (b) so that the temperature at the central point A is quickly raised to a temperature (200 ° C.) necessary for cooking.

As shown by the solid line in FIG. 5, the predetermined time T ₂ is a time period when the heating ratio between the inner heating coil 14 and the outer heating coil 15 is 2: 1 and the heating output is “strong” heating. 12 has set (object to be heated) slightly longer than the time T ₁ to the temperature of the central portion a point required until 200 ° C..

In the above embodiment, when the heating switch 1 is operated, the inner heating coil 14 and the outer heating coil 15 are connected regardless of the setting values of the heating ratio setting volume 17 and the total output setting volume 18. heating the ratio of 2: 1, the heating output is controlled to perform during the heating with the "HIGH" for a predetermined time T _2, the iron plate 12
The heating control by the heating switch 1 may be performed until the temperature at the point A at the center of the above becomes 200 ° C.

That is, when the heating switch 1 is operated, the heating ratio between the inner heating coil 14 and the outer heating coil 15 becomes 2 irrespective of the setting values of the heating ratio setting volume 17 and the total output setting volume 18. : 1
Then, the heating at a high heating output is controlled, and the temperature at the central point A of the iron plate 12 is detected by the thermistor 16. The control is released, and the heating ratio setting volume 17 and the total output setting volume 1 are released.
It is configured to perform the heating control based on the set value set in step 8.

In the above embodiment, the inner heating coil 14
And two outer heating coils 15 are provided, but three or more heating coils are provided, and when the heating switch 1 is operated, one or more specific heating coils among the heating coils are provided. You may comprise so that the heating output of a coil may be made large compared with the heating output of another heating coil.

[0027]

According to the present invention, an induction heating apparatus comprises: a plurality of heating coils provided adjacent to a single object to be heated; a switching means for supplying a high-frequency current to each of the heating coils; In an induction heating device comprising a drive circuit for driving the means and a heating output setting means for varying the individual heating output of the heating coil, regardless of the set value by the heating output setting means, a specific one of the heating coils A heating switch that increases the heating output of the heating coil by a certain value compared to the heating output of the other heating coils is provided.
The temperature of a specific portion of the object to be heated can be quickly raised to a predetermined temperature, so that an extremely convenient induction heating device can be provided.

[Brief description of the drawings]

FIG. 1 is an overall perspective view showing an embodiment of the induction heating device of the present invention.

FIG. 2 is a circuit block diagram showing the induction heating device of the present invention.

FIG. 3 is a cross-sectional view showing a general induction heating device.

FIG. 4 is an overall perspective view showing an example of a conventional induction heating device.

FIG. 5 is a temperature characteristic diagram showing a temperature rise of an object to be heated in the present invention and the conventional induction heating device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heating switch 5 Transistor 6 Drive circuit 9 Transistor 10 Drive circuit 11 Device body 12 Iron plate (object to be heated) 14 Inner heating coil 15 Outer heating coil 16 Thermistor 17 Heating ratio setting volume 18 Total output setting volume

Claims (1)

(57) [Scope of request for utility model registration] 1. A plurality of heating coils provided adjacent to each other with respect to a single object to be heated, switching means for supplying a high-frequency current to each of the heating coils, a drive circuit for driving the switching means, An induction heating apparatus comprising: heating output setting means for varying the individual heating output of the heating coil; irrespective of a setting value by the heating output setting means, the heating output of a specific heating coil among the heating coils is set to another value. An induction heating device comprising a heating switch for increasing a heating value of a heating coil by a certain value.