JP2003077640A - Electromagnetic cooking device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent any failure in deep frying as much as possible. SOLUTION: An electromagnetic cooking device comprises induction heating coils 8 and 9 fitted to a lower side of a top plate 3 for placing a vessel, a temperature sensor 43 disposed substantially at the center of the heating coils, an inverter circuit 37 for supplying power to the induction heating coils by controlling the frequency, input power monitor circuits 41 and 42, and a control circuit 39 for controlling the inverter circuit or the like based on the output of the input power monitor circuits, the output of the temperature sensor, or the like. The control circuit is constituted to supply the predetermined power to the heating coils when starting deep fry and to determine whether or not the vessel is an accessory pan 44 based on the output of the input power monitor circuits and the operating frequency of the inverter circuit in this condition.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic cooker that heats and cooks by induction heating.

[0002]

2. Description of the Related Art In a general electromagnetic cooker, an induction heating coil is arranged under a top plate mounted on the top surface of an appliance body, and a temperature sensor is arranged at a substantially central position of the induction heating coil. By detecting the temperature of the cooking container placed on the top plate by the temperature sensor and controlling the electric power supplied to the induction heating coil based on the detection result, the cooking object stored in the cooking container Is heating to the set temperature.

On the other hand, there are many kinds of cooking containers suitable for the electromagnetic cooker, generally, there are an iron-based pot and a SUS-based pot, but the SUS-based pot has poor heat conductivity. Things
Some pans have a curved inner bottom, and when these pans are used, the temperature difference between the temperature detected by the temperature sensor and the temperature of the pan becomes large. However, there is a problem that accurate temperature control cannot be performed.

Therefore, there is also one in which a cooking container for fried food is set as an accessory in the equipment, but in this case, when fried food is erroneously cooked by using a cooking container other than the attached pan suitable for electromagnetic cooking, There is a problem that delicious cooking results cannot be obtained because the control program is built on the premise that the utensils are combined with the attached pan.

[0005]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to accurately determine whether or not fried food is cooked in a dedicated accessory pan, and prevent fried food from failing.

[0006]

According to the present invention, there is provided a top plate on which a cooking container is placed, an induction heating coil mounted below the top plate, and a temperature sensor arranged at a substantially central position of the heating coil. And an inverter circuit that supplies electric power to the induction heating coil by frequency control, an input power monitor circuit that detects the input power supplied to the induction heating coil, and the output of this input power monitor circuit, the output of the temperature sensor, etc. A control circuit for controlling an inverter circuit or the like, the control circuit supplies predetermined power to the heating coil at the start of fried food cooking, and outputs the input power monitor circuit at this time and the inverter circuit. From the operating frequency,
It is configured to determine whether or not the cooking container is an accessory pot.

Further, according to the present invention, the control circuit lowers the output of the inverter circuit to a preset output when it is determined that the cooking pot is other than the attached pot based on the determination result of the cooking container.
It is configured to notify.

Further, according to the present invention, when the control circuit determines that the cooking pot is other than the attached pot based on the determination result of the cooking container,
The heating operation is stopped and a notification is given.

Further, according to the present invention, a predetermined electric power is set to the maximum thermal power.

Further, according to the present invention, the control circuit is configured to determine whether or not the cooking container is an accessory pot from the output of the input power monitor circuit, the drive frequency of the inverter circuit, and the output of the temperature sensor. It consists of

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described first with reference to FIGS. 1 and 2 by using an electromagnetic cooker. 1 is incorporated in a top cabinet 2 of a system kitchen, for example, by a drop-in method. In the main body of the electromagnetic cooker, a heat-resistant glass top plate 3 is attached to the upper surface, and an intake / exhaust cover 5 with a large number of ventilation holes 4 ... There is.

On the right side of the front surface of the main body 1 of the electromagnetic cooker, an operation panel 6 constituting an input means is arranged, and on the left side of the operation panel, a door 7 for a roaster is arranged so as to be freely drawn out. is doing.

Further, below the top plate 3, induction heating coils 8 and 9 constituting heating means are arranged on the left and right sides in front of the top plate 3, and the heating means is also constructed behind the heating coils. It has a built-in gradient heater 10.

On the other hand, as shown in FIG. 3, the operation panel 6 is mainly divided into three parts in the left-right direction, the left and right seesaw type power switch 11 is set on the right side, and fried food cooking is set under the power switch. A deep-fried food key 12, and an operation key 13 under which an electric current to the induction heating coil 9 is turned on and off,
A pair of firepower setting keys 1 to raise or lower the firepower setting
4 and 15 are arranged, and the above-mentioned fried food key 12 and operation key 1
3. The heating power setting keys 14 and 15 are used to set the operation of the induction heating coil 9 forming the right stove.

A roaster operation key 16 and a heat power setting key 17 are arranged on the upper side in the center of the operation panel 6, and an operation key for turning on / off the energization of the radiant heater 10 is provided under these keys. Similar to 18, a pair of heat power setting keys 19 and 20 are arranged, and three heat power indicating lamps 21 for roasters are arranged on the heat power setting key 17, and each time the heat power setting key 17 is turned on. In addition, the heating power of the roaster is set to be sequentially switched from weak-medium-strong-weak to a loop.

Further, on the left side of the operation panel 6,
A timer key 22 is arranged, and an operation key 23 for turning on / off the power supply to the induction heating coil 8 under the timer key 22.
Similarly, a pair of heating power setting keys 24 and 25 are arranged, and four timer display lamps 26 are arranged on the timer key 22. Whenever the timer key 22 is turned on, 0.5 ( (Time) -1-2-3-off-0.5 and the loop-shaped switching is sequentially set, and the operation of the induction heating coil 8 constituting the left stove is set by these.

The operation keys 13, 16, 18, 2 described above are provided.
Adjacent to these, operation lamps 27, 28, 29, 30 constituted by LED lamps and the like are provided in 3.

Further, in the above embodiment, the fried food key 12 is arranged only on the operating portion for the right stove, and the timer key 22 is arranged only on the operating portion for the left cooking stove, and the fried food cooking function is only for the right cooking stove and the timer. Although the function is set only on the left stove, it is not limited to this, and these functions may be added to both the right and left stoves and the gradient heater 10.

FIG. 4 shows induction heating coils 8 and 9 of the top plate 3.
In the thermal power display section arranged in front of the space, seven thermal power display lamps 31 for displaying the thermal power of the induction heating coil 8 for the left stove in seven stages, and a thermal power display lamp 32 for the radiant heater 10 ... , 7 thermal power display lamps 33 for displaying the thermal power of the induction heating coil 9 for the right stove in 7 steps, and a high temperature for warning when the temperature of the top plate 3 reaches a high temperature of, for example, 70 degrees or more. A lamp 34 is provided.

FIG. 5 shows a part of a circuit block diagram for controlling the energization of the induction heating coils 8, 9 and the like, in which a DC conversion circuit 36 is connected to a commercial 200 V power source 35 via the power switch 11. At the same time, an inverter circuit 37 is connected to the output of the DC conversion circuit, and the induction heating coil 8 is connected to the output of the inverter circuit, and a coil current detecting means 38 for detecting the current value supplied to the coil is connected in series. The circuit is connected.

Reference numeral 39 is a control circuit composed mainly of a microcomputer, and the inverter circuit 37 is provided at the output port.
And a notification buzzer 40 are connected, the operation panel 6 is connected to the input / output port, and the input port is
The output of the input current detection means 41 connected between the power supply 35 and the DC conversion circuit 36, the output of the input voltage detection means 42 connected to the output of the input current detection means, and the substantially central portion of the induction heating coil 8. A temperature sensor 43 such as a thermistor arranged in the above is connected.

Further, the temperature sensor 43 is configured to detect the temperature of the accessory pot 44 placed on the top plate 3 via the top plate 3.

The input power is calculated from the outputs of the input current detecting means 41 and the input voltage detecting means 42, and these constitute an input power monitor circuit.

On the other hand, the inverter circuit 37 adjusts the electric power supplied to the induction heating coil 8 by frequency control. In this case, the frequency can be lowered as shown in A and B of FIG. If the induction heating coil 8 is energized for a long time, the output increases, and if the frequency is increased, the output decreases.

Further, FIG. 7 shows a case where the output of the coil is adjusted by the above frequency control, and the material of the cooking container when the frequency control is performed so that the output of the appliance becomes the maximum output (2 KW in the embodiment). It shows the characteristics of the input power and the coil current due to the difference, and when the accessory pot 44 for fried enamel attached to the equipment is used, the coil current increases in proportion to the input power as shown by the thin solid line. However, in the case of the SUS18-8 pot shown by the dotted line, the increase of the coil current with respect to the increase of the input power is large, the conversion efficiency is lower than that of the attached pot 44, and in the case of the SUS18-8 pot shown by the thick solid line, Further, there is a problem that the efficiency is low and the rated coil current does not flow even if the frequency is increased.

Therefore, according to the present invention, by utilizing the above characteristics, it is determined whether or not an accessory pot is used during fried food cooking, and when a cooking container other than the accessory pot is used, the fact is notified and cooking is performed. It prevents failure.

The operation of the present invention will be described with reference to the flowchart of FIG. 8. After the fried food key 12 is turned on in S1, the operation key 13 is turned on to start the fried food cooking.
In S2, heating is automatically started with maximum heat, and then S
In 3, the input current detection means 41 and the input voltage detection means 4
The input power is calculated from the output of 2 and it is determined whether or not this input power is less than or equal to the predetermined power set in advance. It is determined whether it is inside.

Further, if the temperature is within the range, the process proceeds to S5, where the temperature detected by the temperature sensor 43 is a predetermined temperature (for example, 1
00 degree) or more, and if so, the process proceeds to S6 to continue heating at a predetermined low output (for example, 1450 W), and then at S7, the temperature detected by the temperature sensor 43 is set at a preset control temperature ( (For example, 180 degrees) or more, and if it is more than that, the process proceeds to S8 and the heating is stopped.

After the heating is stopped in S8, S
9 to S12 are sequentially executed, the temperature of the food to be cooked is detected by the temperature detected by the temperature sensor 43, and heating is performed at the output set according to the amount of the food to be cooked and the like.

On the other hand, in S3, when the input power is less than the predetermined power because the cooking container made of a material other than the accessory pot 44 is used or the container is not placed at the predetermined position, In step S13, for example, it is determined whether or not the input power is less than or equal to the preset lower limit power, and if it is less than or equal to it, it is determined that it is a nonconforming pot, and the process proceeds to step S14, in which the buzzer 40 is activated to notify, and heating is stopped to cook. To finish.

Further, if it is determined in S13 that the electric power is equal to or more than the lower limit power, it is determined that cooking is possible although it is not the attached pot 44, and S15
After activating the buzzer 40 to notify the user, heating is started with a predetermined low thermal power (for example, 500 W) preset in S16, and after the start, S17 to S19 are executed and the temperature is the same as above. While detecting the temperature of the cooking target by the temperature detected by the sensor 43, the cooking target is controlled to a predetermined control temperature (for example, 18
Control heating to 0 degree).

With these constructions, it is possible to accurately detect whether or not fried food is cooked using a special accessory pan.
It is possible to reliably prevent the failure of fried food cooking due to the use of cooking containers other than the attached pan.

FIG. 9 shows the above-mentioned FIG.
In the characteristic diagram showing the control example in the case of heating according to the flow chart shown in FIG. 4, when the output of the temperature sensor 43 reaches a predetermined temperature at a after starting heating (S5), the output is switched to a low output (S5).
6) After that, when the control temperature is reached in b, the heating is stopped, so that accurate temperature control substantially matching the temperature of the food can be performed.

FIG. 10 is a flow chart showing another embodiment of the present invention. Explaining only the differences from the flow chart of FIG. 8 above, if the drive frequency of the inverter circuit 37 is within a predetermined range in S4, the routine proceeds to S20. Here, it is determined whether or not the temperature detected by the temperature sensor 43 has risen by a preset predetermined temperature or more within a preset time from the start of heating, and if it has risen, the above-described processing from S5 is performed. To do.

If the temperature has not risen above the predetermined temperature in S20, it means that a cooking container other than the accessory pot 44 is being used or that the pot bottom is warped inward for some reason. The determination is made, and the process proceeds to S13 to process the nonconforming pot.

With these configurations, it is determined whether or not the accessory pot is also used for the output of the temperature sensor, so that even if the accessory pot is used, the temperature of the pot will change due to deformation of the pot bottom or the like. When it cannot be detected accurately, the cooking control can be reliably prevented by not performing the normal control for fried food cooking.

[0037]

According to the structure of the present invention, a predetermined electric power is supplied to the heating coil at the start of fried food cooking, and it is determined from the electric power supplied to the heating coil and the driving frequency that the container being cooked is an accessory pan. By deciding whether or not the attached pan is used, it is possible to surely detect whether or not the attached pan is used and to control the fried food, and it is possible to reliably prevent the fried food from failing.

Further, according to the configuration of the present invention, even if the cooking container is not the accessory pot according to the determination result of the accessory pot, the output of the inverter circuit is configured to be able to continue the cooking at a low output, so that the accessory pot is not changed. Even when it is used for cooking, the fried food can be cooked and the usability can be improved.

Further, according to the configuration of the present invention, when the cooking container other than the attached pot is judged by the determination result of the dedicated pot, the heating operation is stopped by notifying the fact that the cooking pot other than the attached pot is cooked. It is possible to prevent the cooking failure due to the use of the container.

Further, according to the configuration of the present invention, the electric power supplied to the induction heating coil at the start of heating is set to the maximum heating power of the appliance, so that the characteristics of the cooking container can be more accurately determined.

Further, according to the structure of the present invention, the determination of the accessory pot is made based on the power supplied to the heating coil, the driving frequency, and the output of the temperature sensor. If the temperature sensor cannot accurately detect the temperature of the cooking container due to the warped bottom of the pan, it is determined that the attached pan is not in use, and the cooking error due to the use of such pan is reliably prevented. It is something you can do.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment according to the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is a front view showing an embodiment of the operation panel of the same.

FIG. 4 is a plan view of the same main portion.

FIG. 5 is a block diagram showing an embodiment of a control circuit of the same.

FIG. 6 is a time chart which similarly shows the control of the inverter circuit.

FIG. 7 is a graph showing characteristics of input power and coil current.

FIG. 8 is a flowchart for similarly explaining the operation.

FIG. 9 is a time chart when the attached pan is also used.

FIG. 10 is a flowchart showing the operation of another embodiment of the present invention.

[Explanation of symbols] 3 Top plate 8 induction heating coil 9 induction heating coil 37 Inverter circuit 39 Control circuit 40 buzzer 41 Input current detection means 42 Input voltage detection means 43 Temperature sensor 44 attached pan

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Toshiya Nishimoto             3-201 Minamiyoshikata, Tottori City, Tottori Prefecture Tottori             Sanyo Electric Co., Ltd. (72) Inventor Masami Akemi             3-201 Minamiyoshikata, Tottori City, Tottori Prefecture Tottori             Sanyo Electric Co., Ltd. (72) Inventor Takuo Ohara             3-201 Minamiyoshikata, Tottori City, Tottori Prefecture Tottori             Sanyo Electric Co., Ltd. F-term (reference) 3K051 AB05 AC09 AC12 AC33

Claims (5)

[Claims] 1. A top plate on which a cooking container is placed, an induction heating coil mounted below the top plate, a temperature sensor arranged at a substantially central position of the heating coil, and a frequency to the induction heating coil. An inverter circuit that supplies power by control, an input power monitor circuit that detects the input power supplied to the induction heating coil, and the inverter circuit based on the output of the input power monitor circuit, the output of the temperature sensor, and the like. And a control circuit for controlling the output of the input power monitor circuit and the inverter circuit at the time of supplying predetermined power to the heating coil at the start of fried food cooking. An electromagnetic cooker characterized by being configured to determine whether or not the cooking container is an accessory pot from the frequency. 2. The control circuit is configured to reduce the output of the inverter circuit to a preset output and notify when the cooking pot is determined to be a pot other than the attached pot based on the determination result of the cooking container. The electromagnetic cooker according to claim 1, wherein: 3. The control circuit is configured to stop the heating operation and notify when the cooking pot is determined to be a pot other than the attached pot based on the determination result of the cooking container. The electromagnetic cooker according to 1 or 2. 4. The electromagnetic cooker according to claim 1, wherein the predetermined electric power is set to a maximum heating power. 5. The control circuit is configured to determine whether or not the cooking container is an accessory pot from the output of the input power monitor circuit, the drive frequency of the inverter circuit, and the output of the temperature sensor. Claim 1 characterized by the above.
The electromagnetic cooker according to any one of claims 1 to 4.