JPH0732068B2 - Induction heating cooker - Google Patents

Description

TECHNICAL FIELD The present invention relates to an induction heating cooker that cooks while automatically adjusting the heating state according to a heating pattern that matches the intended cooking.

[Prior Art] FIG. 7 is a schematic configuration block diagram showing a conventional induction heating cooker disclosed in, for example, JP-A-61-168890.

In FIG. 1, reference numeral 1 denotes a cooking pot, in which a material 2 to be cooked is placed and placed on the surface of an upper plate 3. A heating coil 4 for inductively heating the cooking pot 1 and a thermistor 5 for converting the temperature change into a resistance change and indirectly detecting the temperature of the cooking pot 1 are provided on the back surface side of the upper plate 3. There is. A voltage conversion circuit 6 converts the resistance change of the thermistor 5 into a voltage change and outputs a voltage conversion signal. A temperature setting unit 7 sets the temperature of the cooking pot 1 to a desired temperature and outputs a temperature setting signal. This temperature setting unit 7
The temperature setting signal output from the voltage conversion circuit 6 and the voltage conversion signal output from the voltage conversion circuit 6 are input to the control circuit 8, and the control circuit 8 compares the voltage conversion signal with the temperature setting signal as a reference. The heating temperature of the cooking pot 1 is controlled to the set temperature, and the set temperature control signal is output. The control circuit 8 is supplied with power from a stabilized constant power supply circuit 10 that converts a commercial power supply 9 into a stabilized constant voltage power supply. The set temperature control signal output from the control circuit 8 is input to the frequency conversion circuit 11 and converted into a high frequency power source adjusted to the level of the low frequency power source of the commercial power source 9 according to the level of the set temperature control signal. , Is applied to the heating coil 4.

Since the conventional induction heating cooker is configured as described above, the cook puts the material 2 to be cooked in the cooking pot 1 and places it on the upper plate 3. Then, the temperature setting unit 7 is operated to determine a desired set temperature, and the temperature setting unit 7 outputs a temperature setting signal. Further, the resistance change due to the temperature change of the thermistor 5 is converted into a voltage change by the voltage conversion circuit 6, and a voltage conversion signal is output to indirectly detect the temperature of the cooking pot 1. Then, the control circuit 8 receives the voltage conversion signal output from the voltage conversion circuit 6 and the temperature setting signal output from the temperature setting unit 7, and cooks while comparing the voltage conversion signal with the temperature setting signal as a reference. A set temperature control signal for controlling the heating temperature of the pan 1 to a set temperature is output. Next, the frequency conversion circuit 11 converts the low frequency power source of the commercial power source 9 into a high frequency power source by the set temperature control signal and applies it to the heating coil 4 to generate a high frequency magnetic field, which induces the bottom of the cooking pot 1. When heated, the temperature of the water 2 in the cooking pot 1 rises. As a result, a resistance change of the thermistor 5 occurs, and the control circuit 8 outputs the set temperature control signal until the level of the voltage conversion signal reaches the level of the temperature setting signal, and the frequency conversion circuit 11 operates. And heating coil 4
Then, the high-frequency magnetic field was continuously generated, and the bottom of the cooking pot 1 was induction-heated until the temperature reached the set temperature.

[Problems to be Solved by the Invention] Since the conventional induction heating cooker is configured as described above and mainly performs a single heating operation until the cooking pot reaches the set temperature, the amount of heat changes with time. Cooking while letting
For example, in the case of stewed dishes, cooked rice, etc., the cook must operate the temperature setting unit to set an appropriate temperature each time, which is a very complicated operation.

This type of technique is also disclosed in Japanese Patent Laid-Open No. 61-16889.

Further, JP-A-62-176410 discloses a technique of determining a heating pattern by selecting a cooking menu. However, this prepared menu is "white rice",
Many cooking menus cannot be prepared because "cooking", "pilaf", "white glazed", etc. are performed by button operation.

The present invention has been made to solve such a problem. Even when cooking while changing the amount of heat depending on time, the cooking pot is set to an appropriate temperature with the change of time, and cooking is performed. Even if a person does not operate a complicated temperature setting section each time, a specific menu can be selected from many cooking menus with a simple operation, and the cooking pot is set to an appropriate temperature over time, and automatic cooking is performed. The purpose is to obtain a possible induction heating cooker.

[Means for Solving Problems] In an induction heating cooker according to the present invention, a heating coil to which a high frequency power source is applied to generate a high frequency magnetic field, and a pan bottom of a cooking pot are set by the high frequency magnetic field generated from the heating coil. In an induction heating cooker equipped with a control circuit for controlling induction heating up to a temperature, a heating pattern section for setting the output of a high-frequency power source applied to the heating coil to change with cooking time in accordance with a cooking item input by a bar code. Be prepared.

[Operation] In this induction heating cooker, the heating level and the heating level are automatically controlled according to the cooking item input by the bar code by the heating pattern unit, and the automatic heating and cooking operation is executed.

[Embodiment] An embodiment of the present invention will be described below with reference to Figs.

FIG. 1 is a schematic block diagram showing an embodiment of an induction heating cooker according to the present invention, and FIG. 2 uses a one-chip microcomputer as a control circuit in the induction heating cooker according to an embodiment of the present invention. Fig. 3 is a block diagram of a basic configuration of the case, Fig. 3 is an external view of an induction heating cooker according to an embodiment of the present invention, and Fig. 4 is data showing a basic pattern when cooking rice in the induction heating cooker according to an embodiment of the present invention. 5 and 5 are explanatory views showing the basic heating pattern data structure in the induction heating cooker of the embodiment of the present invention, and FIG. 6 is an operation flowchart of the induction heating cooker of the embodiment of the present invention. .

In FIG. 1, reference numeral 1 denotes a cooking pot, in which a material 2 to be cooked is placed and placed on the surface of an upper plate 3. A heating coil 4 for inductively heating the cooking pot 1 and a thermistor 5 for indirectly detecting the temperature of the cooking pot 1 by converting a temperature change into a resistance change are provided on the back surface of the upper plate 3. The voltage conversion circuit 6 converts the resistance change of the thermistor 5 into a voltage change and outputs a voltage conversion signal. A temperature setting unit 7 sets the temperature of the cooking pot 1 to a desired temperature and outputs a temperature setting signal. 12 is a bar code reader 12a
And a data conversion circuit 12b. The heating pattern section that outputs the heating pattern signal that automatically sets the output of the high-frequency power source applied to the heating coil 4 according to the item to be cooked and changes with the cooking time, 13 is a single A mode switching unit that switches between heating and automatic heating and outputs a mode switching signal. 14 is a buzzer that gives a warning to the cook. 15
Is a control circuit, the temperature setting signal output from the temperature setting unit 7, the voltage conversion signal output from the voltage conversion circuit 6,
With the heating pattern signal output from the heating pattern unit 12,
When the mode switching unit 13 is automatically set in response to the mode switching signal output from the mode switching unit 13, the cooking pot 1 is heated while comparing the voltage conversion signal with the heating pattern signal as a reference. Automatically controls the temperature to the set temperature, outputs the automatically set temperature control signal, and when the mode switching unit 13 is set to single heating, compares the voltage setting signal with the temperature setting signal as a reference. Meanwhile, the heating temperature of the cooking pot 1 is controlled to the set temperature, and the set temperature control signal is output. The control circuit 15 is supplied with power from a stabilized constant power supply circuit 10 that converts the commercial power supply 9 into a stabilized constant voltage power supply. The automatic set temperature control signal or the set temperature control signal output from the control circuit 15 is input to the frequency conversion circuit 11 to convert the low frequency power source of the commercial power source 9 into a high frequency power source and then applied to the heating coil 4. There is.

Next, a case where the one-chip microcomputer 16 is used as the control circuit 15 will be described with reference to the block diagram shown in FIG. Interrupt controller that controls the interrupt operation generated externally and internally
16a, a timer 16c that divides the oscillation signal of the external oscillator 16b to control the time, a ROM 16d that stores a system program, an instruction decoder 16e that fetches and decodes an instruction from the ROM 16d, and performs an operation. Arithmetic logic unit ALU
16f, a RAM 16g for storing or temporarily comparing data, and a component having a basic function of an input / output port 16h for executing input / output with the outside are provided. And I / O port
The voltage conversion circuit 6, the temperature setting unit 7, the heating pattern unit 12, and the mode switching unit 13 are connected to the input unit of 16h, and the frequency conversion circuit 11 and the buzzer 14 are connected to the output unit. ing.

An external view of the embodiment configured as described above is shown in FIG. In the cooking text 17, various kinds of menus for cooking are posted, and information on contents and ingredients is written. In addition, a bar code 18 in which information of a heating pattern is written is also printed on a part of the page, and when the mode switching unit 13 is set to automatic heating, the bar code reader 12a of the heating pattern unit 12 is printed. Can be scanned to enter heating pattern information.

As shown in FIG. 4, the information on the heating pattern input to the barcode 18 is, for example, the beginning of the heating pattern when cooking rice for four people.
After heating at [W] for 30 minutes, heat at medium heat of 1000 [W] for 20 minutes, reduce the output to 200 [W], boil the rice, and then keep it warm. .

Now, as shown in FIG. 5, when the barcode 18 is scanned by the barcode reader 12a and the information of the heating pattern shown in FIG. 4 for cooking rice for four people is input, for example. , Heating output data and output data are paired, and basic pattern numbers are assigned according to changes in the output level and stored in the RAM 16g. Further, the RAM 16g has an operation register area including an output level register 16g ₁ and a time counter 16g ₂ , and actual output data is output by referring to the operation register area. The output time is managed by decreasing the value of the time counter 16g ₂ by 1, and when the time counter 16g ₂ becomes zero, the next basic pattern number is set from the basic pattern area,
The heating level changes. When the time storage value of the basic pattern area is zero, the automatic heating operation ends.

The control of the induction heating cooker of the above embodiment will be described with reference to the basic control flow chart shown in FIG. This basic control flowchart executes the heating output and time control by calling a subroutine from the main routine at fixed time intervals in the heating output determination subroutine. Further, a bar code input process of the mode switching unit 13 and the heating pattern unit 12 and a frequency conversion circuit for the heating coil 4
The programs such as the output processing of 11 and the output processing of the buzzer 14 are executed as other subroutines.

First, when the heating output value determination subroutine is called,
In step S1, it is determined whether the automatic heating mode is set. In the case of the single heating mode, the process proceeds to step S2 and the end flag is reset. In this embodiment, the automatic heating operation is started by performing the single heating operation once and then performing the automatic heating operation again. Then, in step S3, it is determined whether the set temperature input is "0", and if it is "0", the process proceeds to step S4 and the heating output is set to "0". If the set temperature input is not "0" in step S3, the process proceeds to step S5, the thermistor 5 detection process is executed, and the heating output is calculated by the detected temperature of the thermistor 5 and the value of the temperature setting unit 7 in step S6. And decide. The control up to this point is equivalent to the single heating operation.

In the case of the automatic heating mode, it is subsequently determined in step S7 whether the end flag is set. If the end flag is not set, the process proceeds to step S8, and it is determined whether or not the data is set in the basic pattern area by checking whether all the data in the basic area are "0". If the data is not set in the basic pattern area, the process proceeds to step S9, the barcode input process is executed, and the basic pattern from the barcode 18 is read. Then, in step S10, the read data is set in the basic pattern area, and in step S11, the basic pattern 1 is set in the operation register area. In step S12, the buzzer 14 is operated to heat. The cook is informed that the data reading by the barcode reader 12a of the pattern unit 12 is completed and the automatic pattern heating is started.

When it is determined in step S8 that the data is set in the basic pattern area, the process proceeds to step S13, it is determined whether the time counter 16g ₂ in the operation register is “0”,
If not "0", the sequence proceeds to step S14, and the time counter 16g ₂ in the operation register to -1, the flow proceeds to step S15, and the heating output value of the output level register 16g ₁ within the operation register. That is, the heating time is controlled in steps S13 and S14, and the heating level output is controlled in step S15. If the time counter 16g ₂ in the operation register is "0" in step S13, step S16
Move on to, and the time data in the next basic pattern number is "0".
If it is not "0", step S17
Then, the data of the next basic pattern number is shifted from the basic pattern area to the operation register. This time is the timing at which the heating level changes, the process moves to step S18, and the buzzer 14 is operated to inform the cooker that, for example, if it is cooked rice, it is the timing to add ingredients or the timing to stir. If it is determined in step S16 that the time data in the next basic pattern number is "0", the process proceeds to step S19 to clear the data in the basic pattern area and the operation register area, and then in step S2.
Move to 0, set the end flag, declare that the automatic heating operation has ended, move to step S21, determine the heating output to "0", move to step S22, operate the buzzer 14 Notify the cook that the automatic heating operation has ended. By repeating this operation, automatic cooking can be realized.

As the heating pattern unit 12, in this embodiment, the case where the bar code 18 and the bar code reader 12a are used has been described, but this allows the cook to operate the complicated temperature setting unit each time, A specific menu can be selected from many cooking menus with a simple operation, and the temperature inside the cooking pot is set to an appropriate temperature over time, enabling automatic cooking.

[Effects of the Invention] As described above, according to the present invention, in the induction heating cooking in which the cooking pot is induction-heated to the set temperature by the high-frequency magnetic field generated by the heating coil, the output of the high-frequency power source is adjusted to the cooking time. In addition, since the heating pattern portion which is changed and set and applied to the heating coil is provided, the heating level is automatically controlled along with the cooking time according to the cooking item, and the automatic heating cooking is enabled. In particular, because the bar code is used, a cook can select a specific menu from many cooking menus with simple operations without having to operate a complicated temperature setting section each time, and the cooking pot can be set over time. Automatic cooking is possible by setting the temperature appropriately.

[Brief description of drawings]

FIG. 1 is a schematic block diagram of an induction heating cooker according to an embodiment of the present invention, and FIG. 2 is a basic configuration when a control circuit of the induction heating cooker according to an embodiment of the present invention uses a one-chip microcomputer. Block diagram, FIG. 3 is an external view of an induction heating cooker according to an embodiment of the present invention, and FIG. 4 is a data diagram showing a basic pattern during rice cooking in the induction heating cooker according to an embodiment of the present invention. FIG. 6 is an explanatory view showing a basic heating pattern data structure in an induction heating cooker according to an embodiment of the present invention, FIG. 6 is an operation flowchart of the induction heating cooker according to an embodiment of the present invention, and FIG. 7 is a conventional induction cooker. It is a schematic block diagram of a heating cooker. In the figure, 1 is a cooking pot, 4 is a heating coil, 12 is a heating pattern section, and 15 is a control circuit. In the drawings, the same reference numerals or symbols indicate the same or corresponding parts.

Claims (1)

[Claims] 1. Induction heating cooking, comprising: a heating coil to which a high-frequency power source is applied to generate a high-frequency magnetic field; and a control circuit for controlling induction heating of a pan bottom of a cooking pot to a set temperature by the high-frequency magnetic field generated from the heating coil. An induction heating cooker, comprising: a heating pattern unit configured to change and set an output of a high frequency power source applied to the heating coil with cooking time according to a cooking item input by a bar code.