JP2003059635A - Heater cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heater cooker in which cooking can be made continuously without interruption or stop by reducing the thermal stress of the switching element and, which is easy to handle. SOLUTION: The heater cooker comprises a switching element 4a that is installed corresponding to a heater means 2a for heating the object, an element- temperature detecting means 5a for detecting the temperature of the switching element 4a, and a heating control means 3a for controlling the current conduction and heat output of the heating means 2a. The heat control means 3a performs heating and cooking by changing the heating output corresponding to the monitored temperature, when the detected temperature of the element- temperature detecting means 5a reaches the monitor temperatures of plural steps established beforehand.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating cooker provided with heating means such as a heater and an induction heating coil.

[0002]

2. Description of the Related Art As an example of a heating cooker (induction heating cooker) provided with a heating means (here, an induction heating coil), there is an invention disclosed in Japanese Patent Laid-Open No. 4-137389.

The induction heating cooker disclosed in Japanese Patent Laid-Open No. 4-137389 discloses a high frequency power source for generating a high frequency voltage from a commercial AC power source using a switching element, a resonance capacitor, a high frequency generating circuit and the like, and this high frequency power source. And an induction heating device that heats an object to be heated such as a pan by using a heating coil, temperature control means that compares the temperature of the object to be heated with an arbitrary preset temperature, and measures the temperature of the switching element Element temperature detection means, abnormal temperature detection means for measuring that the temperature of the object to be heated exceeds a predetermined temperature, and the amount of heat given to the object to be heated by controlling the induction heating device by receiving the output of the temperature control means. The temperature of the object to be heated is adjusted to the temperature set by the temperature adjusting means, and when the temperature detected by the element temperature detecting means exceeds a predetermined temperature or the temperature detected by the abnormal temperature detecting means reaches a predetermined temperature. Control means for stopping the output of the high frequency power supply, the element temperature display means for displaying a predetermined display when the output of the element temperature detection means exceeds a predetermined temperature, and the output of the abnormal temperature detection means for the predetermined temperature. And an abnormal temperature display means for displaying a predetermined display when the temperature exceeds the limit.

The element temperature detecting means and the element temperature displaying means and the abnormal temperature detecting means and the abnormal temperature displaying means stop the heating of the object to be heated before the temperature of the switching element rises and is destroyed. In addition, when the temperature of the object to be heated abnormally rises and heating is stopped, a different display is displayed according to each cause, and the user is informed that the stop is due to the temperature rise of the element and the induction heating cooker again. It will be possible to distinguish whether the machine is stopped in a usable state or is stopped due to a cause such as a malfunction of the temperature control temperature sensor and requires specialist repair.

[0005]

In the conventional heating cooker (induction heating cooker) as described above, whether the cooker can be reused by the user or repaired by the element temperature display means and the abnormal temperature display means. So that you can tell what you need. However, in the case where the temperature of the switching element is raised due to an unintended factor that the user does not intend, for example, the induction heating cooker is widely used in general households and various pots for the induction heating cooker are available. In the current situation, especially when a pot made of non-magnetic material is used, the inductance of the pot becomes large due to the relationship with the induction heating coil, and the amount of current flowing through the induction heating coil becomes large. However, an excessive current flows. In such a state, the temperature of the switching element rises. Therefore, in order to prevent the switching element from being destroyed and to cool the switching element, it is necessary to stop the heating of the object to be heated and interrupt the cooking. Due to this interruption, even if the user can distinguish that it can be used again by the display, it may take a long time to cook or uneven cooking may result in poor finish, and in some cases there is a problem that cooking cannot be completed. there were.

Further, if the pot made of such a material is used continuously, the same state continues with respect to the switching element, and the cooking is interrupted every time, and the switching element is cooled and the cooking can be resumed. Even if
Since the cooking temperature and the like had to be set from the beginning, there was also the problem of poor usability.

Further, since the current flowing through the switching element becomes excessive, the loss of the switching element increases and the cooling capacity of the switching element is limited, so that the induction heating cooker cannot withstand continuous use. There was also a problem such as.

The present invention has been made to solve the above problems, and suppresses the temperature rise of the switching element to reduce the thermal stress, and the cooking can be continued without interruption or stop. It is an object of the present invention to provide a heating cooker which has a good cooking finish and is easy to use.

[0009]

A heating cooker according to the present invention includes at least one heating means for heating an object to be heated such as a pan, a switching element provided corresponding to the heating means, and a switching element. Element temperature detection means for detecting the temperature, and connected to the heating means through the switching element,
And a heating control means for controlling energization and heating output of the heating means, wherein the heating control means, when the temperature detected by the element temperature detection means reaches any of a plurality of preset monitoring temperatures, The heating output is varied according to the reached monitoring temperature so that cooking can be performed.

The cooking device according to the present invention comprises at least one heating means for heating an object to be heated such as a pot, a switching element provided corresponding to the heating means, and an element temperature for detecting the temperature of the switching element. A detection means and a heating control means which is connected to the heating means via a switching element and which controls energization and heating output of the heating means,
When the detected temperature of the element temperature detecting means reaches any of a plurality of preset monitoring temperatures, the heating control means lowers the heating output corresponding to the reached monitoring temperature to perform cooking. It is a thing.

The heating cooker according to the present invention comprises at least one heating means for heating an object to be heated such as a pan, a switching element provided corresponding to the heating means, and an element temperature for detecting the temperature of the switching element. A detection means and a heating control means which is connected to the heating means via a switching element and which controls energization and heating output of the heating means,
When the detected temperature of the element temperature detection means reaches any of the preset monitoring temperatures of a plurality of stages, the heating control means sets the reached monitoring temperature to the high level or the heating output set at the start of cooking. Correspondingly, heating cooking is performed by changing the decrease width or the increase width of the heating output.

The heating cooker according to the present invention is provided with an operating section having an input switch corresponding to the heating means, an informing section having a display section, and a control section for informing the operating information of the operating section by the informing section. The control unit causes the notification unit to notify the changed heating output information when the heating output is varied or lowered based on the temperature detected by the element temperature detection unit by the heating control unit or the heating output set at the start of cooking. It is a thing.

The heating cooker according to the present invention is provided with a cooling device for cooling the heating means and the switching element, and a control means for controlling the driving of the cooling device. The control means cools based on the heating output of the heating means. It controls the power of the device.

In the heating cooker according to the present invention, the cooling device comprises a fan and a motor, and the control means increases the rotation speed of the fan of the cooling device as the heating output increases.

In the heating cooker according to the present invention, the cooling device comprises a fan and a motor, and the control means stops the fan of the cooling device when the heating output of the heating means is smaller than a preset heating output or at a low speed. It is driven by rotation, and the fan of the cooling device is driven at high speed when the heating output is larger than a preset heating output.

In the heating cooker according to the present invention, the control means is
The fan of the cooling device is kept rotating at high speed until the temperature of the switching element drops below a preset temperature when the heating output of the heating means drops.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. FIG. 1 is a block diagram showing a configuration of a main part of an embodiment of the present invention. In the figure, 1 is a main body of a heating cooker, and one or more heating means 2 (here, two (2a, 2a, 2a, 2a, 2
b)) is provided, and each heating means 2a, 2b is connected to the respective heating control section 3a, 3b via the corresponding switching element 4a, 4b, and the heating control section 3a, 3b supplies electricity and heat. Output (thermal power, here 2kW, 1.5kW, 1kW, 750W, 500W,
8 stages of 300W, 200W, 100W and 0.5 stage which is a stage between each stage) are controlled. In the vicinity of the switching elements 4a and 4b, a radiating fin (not shown) for suppressing heat generation of the switching elements 4a and 4b is attached or the switching elements 4a and 4b.
Each of the switching elements 4a,
Temperature sensing elements 5a and 5b, which are element temperature detecting means for detecting the temperature of 4b, respectively, and a cooling device 6 including a fan and a motor for cooling the heating means 2a and 2b and the switching elements 4a and 4b are provided. There is. And
Each of the heating control units 3a and 3b uses a control function for preventing excessive temperature rise of each of the switching elements 4a and 4b provided therein, so that the detected temperature T of the temperature sensitive elements 5a and 5b is set in advance at a plurality of monitoring temperatures ( Here, 120 ℃, 110 ℃, 10
When any one of 5 degrees C and 100 degrees C) is reached, the heating output of the heating means 2a, 2b is reduced to the heating output corresponding to the reached monitoring temperature and the cooking of the object to be heated is continued. Let

A part of 7 is exposed on the surface of the main body 1, and the input switches 8a and 8b corresponding to the heating means 2a and 2b (here, energization ON / OFF and heating output are 2kW and 1.5k).
W, 1 kW, 750 W, 500 W, 300 W, 200
W, 100 W) that can be set in 8 steps), 9 has a notification control unit 10, and is a control unit that drives and controls the cooling device 6, and notifies based on an input signal from the operation unit 7. The operation contents are notified to the user via the control unit 10 by a display unit (not shown) or a buzzer provided in the notification unit 11, and the heating control unit 3a, based on the input signal from the operation unit 7, A heating operation start signal is sent to 3b and the cooling device 6 to drive the heating means 2a, 2b and the cooling device 6.

Next, the first embodiment configured as described above
The action of will be described with reference to the flowchart of FIG. For example, when stir-fry cooking is performed using a frying pan that is an object to be heated, first, put the frying pan on the heating means 2a side of the main body 1 and operate the input switch 8a corresponding to the heating means 2a provided in the operation unit 7, By the control unit 9 and the heating control unit 3a, the energization of the heating means 2a is turned on, and the heating by the set arbitrary heating output (here, the maximum heating power of 2 kW for fried cooking) is started. At this time,
The notification unit 11 notifies the display unit or the like of the energization state and the set heating output, which are operation contents from the operation unit 7, by the notification control unit 10 of the control unit 9.

Then, when the frying pan is heated to an appropriate degree, foods such as oil and vegetables are put in and cooked by frying. During cooking, that is, while the heating means 2a is energized, current also flows in the switching element 4a, and the temperature sensitive element 5a detects the temperature of the switching element 4a every predetermined time (for example, 10 seconds). And the heating control unit 3
a is heating means 2a when the detected temperature T from the temperature sensitive element 5a exceeds an abnormal temperature (for example, 120 ° C.), which is one of the monitored temperatures, based on the control function of the switching element 4a for preventing excessive temperature rise. Stop energizing (S101 in FIG. 2,
S102), when the temperature is below the abnormal temperature (120 ° C.) and exceeds 110 ° C. which is the next monitoring temperature, the set heating output (here, 2 kW) is lowered to the heating output (1 kW) that is two steps lower and cooking is performed (S103). , S104), and when the temperature exceeds 105 ° C, which is the next monitoring temperature, at 110 ° C or lower, cooking is performed by lowering the set heating output to a heating output (1.5 kW) that is one step lower (S105, S106), and 105 ° C. If the temperature exceeds 100 ° C., which is the next monitoring temperature, the heating output is 0.5 steps lower than the set heating output (heating output controlled by the heating controller 3a, which cannot be set by the input switch 8a, 1.75 kW). ) To cook (S107, S
108). When the detected temperature T is 100 ° C or lower,
Cooking is performed with the set heating output (2 kW), the temperature of the switching element 4a is monitored until the cooking is completed, and the heating output is adjusted based on the detected temperature T of the temperature sensitive element 5a.

At this time, the notification unit 11 does not change the display corresponding to the set heating output (2 kW) set at the start of cooking until the cooking is completed. The heating controller 3a
A heating output adjusted by the notification control unit 10 of the control unit 9, for example, a display corresponding to the heating output 1 kW reduced by two steps from the set heating output 2 kW is displayed based on the heating output adjustment signal from The user may be able to recognize the heating output that is present.

On the other hand, the control unit 9 controls the driving of the cooling device 6, and when the set heating output is low, the temperature of the switching element 4a does not rise sharply, so the fan of the cooling device 6 is stopped or driven at low speed. However, when the set heating output is high, the temperature of the switching element 4a also rises sharply.
The fan of the cooling device 6 is driven at high speed to prevent the temperature of the switching element 4a from rapidly increasing. When the heating output is adjusted to suppress the temperature rise of the switching element 4a and the high heating output is changed to the low heating output,
The control unit 9 keeps the fan rotating at high speed until the temperature of the switching element 4a falls below a predetermined temperature (for example, 100 ° C.), and enhances the cooling effect of the switching element 4a. It should be noted that the drive of the cooling device 6 and the control of the rotation speed of its fan are not only performed corresponding to the set heating output, but also
It may be performed corresponding to the temperature T detected by the temperature sensing element 5a or the heating output after adjustment based on the temperature T detected.

As described above, the temperature sensitive elements 5a and 5b for detecting the temperature of the switching elements 4a and 4b corresponding to the heating means 2a and 2b are provided, and the temperature sensitive elements 5a and 5b are provided.
When the abnormal temperature, which is one of the monitored temperatures, is exceeded based on the detected temperature T of b, cooking is stopped, and when the other monitored temperatures are exceeded, the heating output of each heating means 2a, 2b is monitored correspondingly. Since the heating output corresponding to the temperature is lowered and the cooking is continued, the switching elements 4a and 4b
It is possible to obtain an easy-to-use heating cooker that can suppress the temperature rise of the above, reduce the thermal stress, and prevent the interruption or stop of the cooking as much as possible without uneven cooking.

Embodiment 2. Embodiment 2 according to the present invention
In the heating cooker according to the first embodiment shown in FIG. 1, when the temperature exceeds an abnormal temperature which is one of the monitored temperatures based on the detected temperature T of each of the temperature sensitive elements 5a and 5b, the cooking is stopped, When the other monitored temperatures are exceeded, each heating means 2a,
The heating output of 2b is lowered to the heating output corresponding to the corresponding monitored temperature to continue the cooking (S101 to S108 in the flowchart shown in FIG. 3), and each temperature sensing element 5a, 5
When the detected temperature T of b is below 80 ° C., which is one of the monitored temperatures, the set heating output (2 kW) is increased to a heating output 0.5 steps higher (2.25 kW) and cooking is performed (FIG. 3). S109, S110).

Also in the second embodiment having such a configuration, as in the case described in the first embodiment, the frying pan, which is the object to be heated, is placed on the heating means 2a side of the main body 1, and the input switch 8a of the operating section 7 is placed. Is operated to set the heating output, the heating means 2a is controlled by the controller 9 and the heating controller 3a.
Is energized and fried cooking is started. During cooking, the temperature sensitive element 5a detects the temperature of the switching element 4a every predetermined time, and the heating control section 3a lowers or raises the set heating output until the end of cooking based on the detected temperature T of the temperature sensitive element 5a. Any adjustment without change is performed (see the flowchart of FIG. 3), and cooking is continued by the adjusted heating output.

As described above, when the abnormal temperature, which is one of the monitored temperatures, is exceeded based on the detected temperature T of each of the temperature sensitive elements 5a and 5b, the cooking is stopped, and the other monitored temperatures are exceeded or dropped. In this case, since the heating output of each heating means 2a, 2b is changed to the heating output corresponding to the corresponding monitored temperature for cooking, each switching element 4a, 4b is used.
It is possible to obtain an easy-to-use heating cooker capable of suppressing the temperature rise of the above, reducing thermal stress, continuing the cooking without interrupting or stopping the cooking, and being able to cook well without finishing the cooking time.

In the first and second embodiments described above, when the detected temperature T of each of the temperature sensitive elements 5a and 5b reaches any of the preset monitoring temperatures of a plurality of stages, each heating means 2 is used.
The case where the heating output of a and 2b is changed to the heating output corresponding to the reached monitoring temperature and heating and cooking are continued has been described as an example, but the heating output of each heating means 2a and 2b is set at the start of cooking. You may make it continue heating cooking by changing the width | variety of the increase or decrease of the stage of a heating output according to the magnitude of a heating output. That is, when the set heating output is large, the decrease width of the heating output stage is increased and the increase amount is reduced, and when the set heating output is small, the decrease amount of the heating output stage is decreased and the increase amount is increased.

[0028]

As described above, the heating cooker according to the present invention includes at least one heating means for heating an object to be heated such as a pot, a switching element provided corresponding to the heating means, and a switching element. Element temperature detection means for detecting the temperature, and connected to the heating means through the switching element,
And a heating control means for controlling energization and heating output of the heating means, wherein the heating control means, when the temperature detected by the element temperature detection means reaches any of a plurality of preset monitoring temperatures, Since the heating output is adjusted to the heating output corresponding to the reached monitoring temperature, the temperature rise of the switching element is suppressed to reduce the thermal stress, and cooking can be continued without interruption or stop. Therefore, it is possible to obtain an easy-to-use heating cooker that can be cooked well without long cooking time.

The heating cooker according to the present invention comprises at least one heating means for heating an object to be heated such as a pan, a switching element provided corresponding to the heating means, and an element temperature for detecting the temperature of the switching element. A detection means and a heating control means which is connected to the heating means via a switching element and which controls energization and heating output of the heating means,
When the detected temperature of the element temperature detecting means reaches any of a plurality of preset monitoring temperatures, the heating control means lowers the heating output corresponding to the reached monitoring temperature to perform cooking. Therefore, the temperature rise of the switching element can be suppressed, the thermal stress can be reduced, and it is possible to obtain the easy-to-use heating cooker without cooking unevenness that can prevent the interruption or stop of cooking as much as possible.

The heating cooker according to the present invention comprises at least one heating means for heating an object to be heated such as a pan, a switching element provided corresponding to the heating means, and an element temperature for detecting the temperature of the switching element. A detection means and a heating control means which is connected to the heating means via a switching element and which controls energization and heating output of the heating means,
When the detected temperature of the element temperature detection means reaches any of the preset monitoring temperatures of a plurality of stages, the heating control means sets the reached monitoring temperature to the high level or the heating output set at the start of cooking. Correspondingly, the heating output can be lowered or increased to perform heating and cooking, so that it is possible to suppress the temperature rise of the switching element and reduce thermal stress, and also without interrupting or stopping cooking. It is possible to obtain a heating cooker that can be continuously operated.

The heating cooker according to the present invention is provided with an operation section having an input switch corresponding to the heating means, an informing section having a display section and the like, and a control section for informing the operation information of the operation section by the informing section. The control unit causes the notification unit to notify the changed heating output information when the heating output is varied or lowered based on the temperature detected by the element temperature detection unit by the heating control unit or the heating output set at the start of cooking. Therefore, the user can grasp the heating output currently being executed, and a convenient cooker can be obtained.

The heating cooker according to the present invention is provided with a cooling device for cooling the heating means and the switching element, and a control means for controlling the driving of the cooling device. The control means cools based on the heating output of the heating means. Since the power of the device is controlled, the temperature rise of the switching element can be suppressed,
A cooker capable of reducing thermal stress is obtained.

In the heating cooker according to the present invention, the cooling device is composed of the fan and the motor, and the control means increases the rotation speed of the fan of the cooling device as the heating output increases, so that the temperature rise of the switching element is suppressed. A heating cooker capable of reducing thermal stress is obtained.

In the heating cooker according to the present invention, the cooling device is composed of a fan and a motor, and the control means stops the fan of the cooling device when the heating output of the heating means is smaller than a preset heating output or at a low speed. It is driven by rotation, and the fan of the cooling device is driven at high speed when it is larger than the preset heating output, so it is possible to reduce noise at low heating output and suppress temperature rise of switching element at high heating output. A heating cooker that can enhance the cooling effect is obtained.

In the heating cooker according to the present invention, the control means is
When the heating output of the heating means decreases, the fan of the cooling device is kept rotating at high speed until the temperature of the switching element falls below a preset temperature, so it is possible to suppress the temperature rise of the switching element and enhance the cooling effect. A heating cooker that can be obtained is obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a main part of an embodiment of the present invention.

FIG. 2 is a flowchart showing an operation of the first embodiment of the present invention.

FIG. 3 is a flowchart showing an operation of the second embodiment of the present invention.

[Explanation of symbols]

2a, 2b heating means, 3a, 3b heating control section, 4
a, 4b switching element, 5a, 5b temperature sensitive element,
6 cooling device, 7 operation part, 8a, 8b input switch, 9 control part, 10 notification control part, 11 notification part.

Claims (8)

[Claims] 1. At least one for heating an object to be heated such as a pan
One heating means, a switching element provided corresponding to the heating means, an element temperature detecting means for detecting the temperature of the switching element, and a heating element connected to the heating means via the switching element, and the energization of the heating means. And heating control means for controlling the heating output, the heating control means reaching the temperature when the temperature detected by the element temperature detecting means reaches any of a plurality of preset monitoring temperatures. A heating cooker characterized in that heating cooking is performed by changing the heating output corresponding to the monitored temperature. 2. At least one for heating an object to be heated such as a pan
One heating means, a switching element provided corresponding to the heating means, an element temperature detecting means for detecting the temperature of the switching element, and a heating element connected to the heating means via the switching element, and the energization of the heating means. And heating control means for controlling the heating output, the heating control means reaching the temperature when the temperature detected by the element temperature detecting means reaches any of a plurality of preset monitoring temperatures. A heating cooker characterized by lowering the heating output corresponding to the monitored temperature to perform heating cooking. 3. At least one for heating an object to be heated such as a pan
One heating means, a switching element provided corresponding to the heating means, an element temperature detecting means for detecting the temperature of the switching element, and a heating element connected to the heating means via the switching element, and the energization of the heating means. And heating control means for controlling the heating output, the heating control means reaching the temperature when the temperature detected by the element temperature detecting means reaches any of a plurality of preset monitoring temperatures. A heating cooker characterized in that heating cooking is performed by changing a decrease width or an increase width of the heating output in accordance with the height of the monitored temperature or the size of the heating output set at the start of cooking. 4. An operating unit having an input switch corresponding to the heating unit, an informing unit having a display unit, and a control unit for informing the operating information of the operating unit by the informing unit. When the heating output is varied or lowered based on the temperature detected by the element temperature detecting means by the heating control means or the heating output set at the start of cooking, the information of the changed heating output is notified by the notifying unit. The cooking device according to any one of claims 1 to 3. 5. A cooling device for cooling the heating means and the switching element, and a control means for controlling the driving of the cooling device are provided, and the control means controls the power of the cooling device based on the heating output of the heating means. The cooking device according to any one of claims 1 to 4, which is controlled. 6. The heating cooker according to claim 5, wherein the cooling device comprises a fan and a motor, and the control means increases the rotation speed of the fan of the cooling device as the heating output increases. 7. The cooling device comprises a fan and a motor, and the control means stops or drives the fan of the cooling device at a low speed when the heating output of the heating means is smaller than a preset heating output, The heating cooker according to claim 5, wherein the fan of the cooling device is driven at a high speed when the heating power is larger than the set heating output. 8. The control means keeps the fan of the cooling device rotating at a high speed until the temperature of the switching element falls below a preset temperature when the heating output of the heating means falls. The heating cooker according to 6 or 7.