JPH09148062A - Cooker - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a heating cooker capable of automatically preventing a cooking container to be heated from being left for a long time at a high temperature due to, for example, baking. SOLUTION: The heating output of the heating means is reduced when the peak temperature of the cooking vessel to be heated 3 exceeds a predetermined set temperature by a predetermined value or more.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating cooker for cooking using a heating means such as an induction heater.

[0002]

2. Description of the Related Art In recent years, as a commonly used heating cooker, an electromagnetic induction heating cooker has begun to spread in place of a gas stove, and its characteristic cleanliness, comfort, and safety have come to be evaluated. . Further, it is also characterized in that it is easy to control due to its electrical configuration.

A conventional heating cooker will be described below. FIG. 10 is a schematic view of a conventional heating cooker, in which a heat-resistant ceramic plate 42 on which a heated cooking vessel 41 is placed and a heat-resistant ceramic plate 4 are placed.
2, the heating means for heating the cooking container 41 is composed of a heating coil 43, an inverter circuit including a transistor 44, a diode 45, a condenser 46 and the like. Reference numeral 47 is a rectifying circuit that forms the power supply of the oscillation circuit, and 48 is a smoothing circuit. A temperature sensor 49 formed of a negative characteristic thermistor or the like is provided directly below the heated cooking container 41 on the heat-resistant ceramic plate 42 to detect the temperature of the heated cooking container 41. 50 is an oscillating circuit for driving the inverter, 51 is a temperature detecting circuit, 52 is a stop circuit for stopping the inverter operation, 53 is a timer circuit for arbitrarily setting a time and stopping heating, and 54 is a heating start. This is an automatic stop circuit for automatically stopping heating after a predetermined time has elapsed.

As a safety means for leaving the heating cooker configured as described above in a high temperature state, there is provided an automatic stop circuit for automatically stopping heating when a predetermined time has elapsed after the start of heating.

[0005]

However, in the above-described conventional heating cooker configuration, the cooker forgets to turn off the switch after cooking, and if water evaporates during boiling, the cooked food is cooked for a long time. In case you accidentally forget to set the timer and leave the kitchen and the water evaporates and is burnt in the air, depending on the output setting, it may be a fairly high temperature for a long time (generally, this automatic stop time setting is 45
~ 60 minutes. ) Had the problem of being left alone.

It is an object of the present invention to solve the above problems and provide a highly safe heating cooker that stops heating in a short period of time when it is left in a high temperature state, or keeps it warm or switches to low heat. And

[0007]

Means for Solving the Problems The means of the present invention for solving the above-mentioned problems include a heating means, a temperature detecting means for detecting the temperature of a cooking container to be heated, and an output in advance according to the output of the temperature detecting means. A heating output control means for controlling the heating output of the heating means according to a predetermined program and a heating output switching means for switching the heating output are provided, and the heating output switching means is a peak detected by the temperature detecting means. It operates when the difference between the temperature and the preset temperature exceeds a predetermined value.

Further, the other means are: heating means, temperature detecting means for detecting the temperature of the cooking container to be heated, and heating output of the heating means according to a predetermined program according to the output of the temperature detecting means. A heating output control means for controlling, a heating output switching means for switching the heating output, and a time until the temperature detected by the temperature detecting means exceeds a predetermined set temperature and then returns to the set temperature again is counted. Timer output means, and the heating output switching means operates when the measurement time measured by the timer output exceeds a predetermined time setting.

[0009]

According to the invention of claim 1, when the cooking container to be heated is in an unbaked state or the like, it is detected that the cooking container is left in a high temperature state by the information from the temperature detecting means, and the temperature of the cooking container to be heated is detected. Since the heating output is switched depending on the difference between the temperature and the preset temperature, it is not left for a long time in a high temperature state.

According to the second aspect of the present invention, when the cooking container to be heated is in an idle state or the like, it is detected from the temperature detecting means that the cooking container is left at a high temperature, and the cooking container to be heated is set to a predetermined set temperature. Since the heating output is switched depending on the time when the temperature is exceeded, it is not left for a long time in a high temperature state.

According to the third aspect of the present invention, it is possible to prevent an erroneous operation of detecting that the user is left in a high temperature state even though the user is on the heating cooker side and cooking.

Embodiments of the present invention will be described below with reference to the drawings. (Embodiment 1) FIG. 1 is a block diagram of a heating cooker showing a first embodiment of the present invention. The heating means is a heating coil 1.
A heat-resistant ceramic plate 4 for mounting the cooking container 3 to be heated is provided on the heating coil 1. As the temperature detecting means, a temperature sensor 5 such as a negative characteristic thermistor for detecting the temperature of the cooking container 3 to be heated is attached to the center of the heating coil 1, and the temperature detected by the temperature sensor 5 is used as an input signal. The temperature conversion device 6 is composed of an AD converter or the like for conversion. Reference numeral 7 is a heating output control means for controlling the heating output of the heating means, and controls according to a predetermined program by the input from the temperature sensor 5. Reference numeral 8 denotes a heating output switching means, and when the difference between the preset temperature and the peak temperature of the cooking container 3 exceeds a predetermined value, it is detected that the apparatus is left in a high temperature state and the heating output is stopped. , Or keep it warm or switch to low heat.

The operation of the heating cooker configured as described above will be described with reference to FIGS. 2 and 3. FIG.
Represents the relationship between the temperature of the cooking vessel 3 to be heated by the temperature sensor 5 when the heating is started in the air-free state and the temperature is left as it is, and the heating output controlled by the information from the temperature sensor 5. Is. After the normal heating is started, the heating output operates according to a predetermined program by the input from the temperature sensor 5. However, in the case of the baking condition, the temperature of the cooking container 3 to be heated is rapidly increased, Even if the control is performed, the temperature becomes high and the heating output operates from the maximum output of the set output to the output stopped state. This is a peculiar operation in a no-load state such as air baking, and the set temperature at this time is set to T1, the cooking container 3 to be heated.
The peak temperature of T2 is set to T2, and when the value of (T2-T1) exceeds a predetermined value, the heating output is switched to prevent standing in a high temperature state. (FIG. 2 shows the case where the heating is stopped.) FIG. 3 shows the temperature sensor 5 in the actual cooking such as fried vegetables.
Represents the relationship between the temperature detected by the sensor and the heating output controlled by the information from the temperature sensor 5. The heating output operates according to a predetermined program, and is a unique operation in a no-load state such as baking. Is not done.

As is clear from the above, the heating cooker according to the present embodiment can clearly judge whether it is left in a high temperature state. Thus, according to the present embodiment,
It is possible to prevent the product from being left in a high temperature state such as baking.

(Embodiment 2) FIG. 4 is a block diagram of a heating cooker showing a second embodiment of the present invention, wherein the heating means is composed of a heating coil 11 and an inverter 12, and the heating coil 11 has an upper portion. Is provided with a heat resistant ceramic plate 14 on which the heated cooking vessel 13 is placed. As the temperature detecting means, at the center of the heating coil 11,
A temperature sensor 15 including a negative characteristic thermistor for detecting the temperature of the cooking container 13 to be heated is attached, and a temperature conversion including an AD converter for converting the temperature detected by the temperature sensor 15 into an input signal. The device 16 is used. Reference numeral 17 denotes a heating output control means for controlling the heating output of the heating means, which controls according to a predetermined program by the input from the temperature sensor 15. 18 is
The timer means 19 for counting the time until the temperature of the cooking container 13 to be heated exceeds the preset temperature and reaches the preset temperature again, 19 is the heating output switching means, and the measurement time of the timer means 18 It detects that it has been left in a high temperature state and stops heating output, or keeps it warm or switches to low heat.

The operation of the heating cooker configured as described above will be described with reference to FIGS. 5 and 3. FIG.
Represents a relationship between the temperature of the cooking container 13 to be heated by the temperature sensor 15 when the heating is started in an idle state and the temperature is left as it is, and the heating output controlled by the information from the temperature sensor 15. Is. After the start of normal heating, the heating output operates according to a predetermined program according to the input from the temperature sensor 15. However, in the case of an idle condition, the temperature of the cooking container 13 to be heated is rapidly increased, Even if the control is performed, the temperature becomes high and the heating output operates from the maximum output of the set output to the output stopped state. This is a peculiar operation in the no-load state due to baking, etc., and the time until the set temperature is exceeded is S
1, S2 is the time until the temperature reaches the set temperature again, and (S
2-When the value of S1) exceeds a predetermined value, the heating output is switched to prevent the device from being left in a high temperature state.
(FIG. 2 shows a case where the heating is stopped.) FIG. 3 is a temperature sensor 1 in actual cooking such as fried vegetables.
5 shows the relationship between the detected temperature of No. 5 and the heating output controlled by the information from the temperature sensor 15. The heating output operates according to a predetermined program, and is unique to the unloaded state due to baking. No action is taken.

As is clear from the above, the heating cooker according to the present embodiment can clearly determine whether it is left in a high temperature state. Thus, according to the present embodiment,
It is possible to prevent the product from being left in a high temperature state such as baking.

(Embodiment 3) FIG. 6 is a block diagram of a heating cooker showing a third embodiment of the present invention. The heating means is composed of a heating coil 21 and an inverter 22. Is provided with a heat-resistant ceramic plate 24 on which the cooked container 23 is placed. As the temperature detecting means, at the center of the heating coil 21,
A temperature sensor 25 including a negative characteristic thermistor for detecting the temperature of the cooking container 23 to be heated is attached, and a temperature conversion including an AD converter for converting the temperature detected by the temperature sensor 25 into an input signal. The device 26 is used. Reference numeral 27 is a heating output control means for controlling the heating output of the heating means, which controls according to a predetermined program by the input from the temperature sensor 25. 28 is
When the difference between the preset temperature and the peak temperature of the cooking container to be heated 23 exceeds a predetermined value, it is detected that it is left in a high temperature state and the heating output is stopped, or the heating is stopped or the heating is switched to low heat. Output switching means 29 is provided from a time point when the temperature of the heated cooking vessel 23 exceeds a predetermined set temperature until the difference between the peak temperature of the heated cooking vessel 23 and the set temperature exceeds a predetermined value. It is an operation canceling means for canceling the operation of the heating output switching means when an operation signal is input from the outside during the period.

The operation of the heating cooker configured as described above will be described with reference to FIG. FIG. 7 shows the relationship between the temperature of the cooking container 23 to be heated detected by the temperature sensor 25 and the heating output controlled by the information from the temperature sensor 25 when it is heated in an idle state from the start of heating and left as it is. It represents. After starting the normal heating,
By the input from the temperature sensor 25, the heating output operates according to a predetermined program. However, when the cooking container 23 to be heated is abruptly heated in an idle state, the heating output is controlled. The temperature becomes high, and the heating output operates from the maximum output of the set output to the output stopped state. This is a peculiar operation under a no-load condition such as baking, and the set temperature at this time is T1, the cooking container 2 to be heated.
The peak temperature of 3 is set to T2, and when the value of (T2-T1) exceeds a predetermined value, the heating output is switched to prevent leaving in a high temperature state. However, from the time when the temperature of the heated cooking container 23 exceeds a predetermined set temperature until the difference between the peak temperature of the heated cooking container 23 and the set temperature exceeds a predetermined value, When the operation signal is input, it is assumed that the user is on the side and executes a predetermined program by the operation canceling means to prevent a malfunction that is detected as being left in a high temperature state. is there.

(Embodiment 4) FIG. 8 is a block diagram of a heating cooker showing a fourth embodiment of the present invention. The heating means comprises a heating coil 31 and an inverter 32. Is provided with a heat-resistant ceramic plate 34 on which the cooking container 33 to be heated is placed. As the temperature detecting means, at the center of the heating coil 31,
A temperature sensor 35 including a negative characteristic thermistor for detecting the temperature of the cooking container 33 to be heated is attached, and a temperature conversion including an AD converter for converting the temperature detected by the temperature sensor 35 into an input signal. The device 36 is used. Reference numeral 37 is a heating output control means for controlling the heating output of the heating means, and controls according to a predetermined program by the input from the temperature sensor 35. 38 is
The timer means 39 counts the time until the temperature of the heated cooking vessel 33 exceeds the preset temperature and reaches the preset temperature again, and 39 is left in a high temperature state according to the measurement time of the timer means 38. Is detected, the heating output is stopped, or the heating is switched to low heat or low heat.
0 cancels the operation of the heating output switching means when an operation signal from the outside is input until the temperature of the cooking container 33 to be heated exceeds the preset temperature and reaches the preset temperature again. Is a means for canceling the operation.

The operation of the heating cooker configured as described above will be described with reference to FIG.

FIG. 9 shows the temperature of the cooking container 33 to be heated by the temperature sensor 35 detected by the temperature sensor 35 when it is heated in an air-baked state from the start of heating and left as it is, and the temperature sensor 35.
It represents the relationship of the heating output controlled by the information from. After the normal heating is started, the heating output operates according to a predetermined program by the input from the temperature sensor 35. However, in the case of the baking condition, the temperature of the cooking container 33 to be heated is rapidly increased, and the heating output Even if the control is performed, the temperature becomes high and the heating output operates from the maximum output of the set output to the output stopped state. This is a peculiar operation in a no-load state due to baking, etc., and the time until the set temperature is exceeded is S1,
2, when the value of (S2-S1) exceeds a predetermined value, the heating output is switched to prevent the device from being left in a high temperature state. However, if an operation signal from the outside is input before the temperature of the cooking container 33 detected by the temperature detecting means exceeds a preset set temperature and reaches the set temperature again, use As a person on the side, a predetermined program is executed by the operation canceling means to prevent an erroneous operation of detecting that it is left in a high temperature state.

Although the heating coil is used as the heat source in the first to fourth embodiments of the present invention, the heat source can be appropriately changed if necessary.

[0024]

As described above, according to the first to third aspects of the present invention, when cooking is done by forgetting to turn off the switch, or when water is boiled and water is boiled, it is cooked for a long time. In situations such as when you forget to set the timer accidentally and leave the kitchen and the water evaporates and it is baked in the air,
It is possible to realize a highly safe heating cooker that stops heating, keeps heat or switches to low heat in the shortest possible time when left in a high temperature state, and its value is great.

[Brief description of the drawings]

FIG. 1 is a block diagram of a heating cooker according to a first embodiment of the present invention.

FIG. 2 is a correlation diagram between the temperature detected by the temperature sensor and the heating output when the heating cooker is in an idle state.

FIG. 3 is a correlation diagram between a temperature sensor detection temperature and a heating output in the normal cooking state of the heating cooker.

FIG. 4 is a block diagram of a heating cooker according to a second embodiment of the present invention.

[Fig. 5] Similarly, a correlation diagram between the temperature detected by the temperature sensor and the heating output when the heating cooker is in an idle state.

FIG. 6 is a block diagram of a heating cooker according to a third embodiment of the present invention.

FIG. 7 is a correlation diagram between the temperature detected by the temperature sensor and the heating output when the heating cooker is in an idle state.

FIG. 8 is a block diagram of a heating cooker according to a fourth embodiment of the present invention.

FIG. 9 is a correlation diagram between the temperature detected by the temperature sensor and the heating output when the cooking device is in the dry state.

FIG. 10 is a block diagram of a conventional heating cooker.

[Explanation of symbols]

 1 Heating Coil 2 Inverter 3 Heated Cooking Container 4 Heat Resistant Ceramic Plate 5 Temperature Sensor 6 Temperature Converter 7 Heating Output Control Means 8 Heating Output Switching Means

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Koichi Hosoi 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (3)

[Claims] 1. A heating means, a temperature detecting means for detecting the temperature of a cooking container to be heated, and a heating output control for controlling the heating output of the heating means according to a program predetermined according to the output of the temperature detecting means. Means and heating output switching means for switching the heating output, wherein the heating output switching means has a difference between the peak temperature detected by the temperature detecting means and a preset temperature exceeding a predetermined value. A cooker that will be working in case. 2. A heating means, a temperature detecting means for detecting a temperature of a cooking container to be heated, and a heating output control for controlling a heating output of the heating means according to a program predetermined according to an output of the temperature detecting means. Means, heating output switching means for switching the heating output, and timer means for counting the time until the temperature detected by the temperature detecting means exceeds a predetermined set temperature and then returns to the set temperature again. A heating cooker provided with the heating output switching means when the measurement time measured by the timer means exceeds a predetermined set time. 3. The operation releasing means for releasing the operation of the heating output switching means is provided, and the operation releasing means operates when an operation signal from the outside is input.
The cooker described.