JPS5887795A - Induction heating cooking device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an induction heating cooker, and particularly to an induction heating cooker, which provides boiling notification;
The present invention relates to an induction heating cooker that can effectively prevent dry cooking.

Technical Background of the Invention In recent years, flameless cookers that utilize electromagnetic induction heating using commercial frequency waves have been developed, and have gained popularity for their high thermal efficiency and the ability to cook safely and cleanly. This is called an induction heating cooker, and it generally consists of an excitation coil, a special pot with a copper/iron base plate structure, and a top plate that acts as a cooker.The excitation coil is connected to a commercial power source. be done. The magnetic flux generated by the energization of the excitation coil passes through the bottom of the pot, causing an eddy current to flow due to electromagnetic induction, which directly generates heat in the pot. Since the energy source of such an induction heating cooker is electricity, it has superior performance and safety features, unlike scum- or oil-burning cookers. Examples include an output setting device and an abnormal temperature detection device. The former has its adjustment knob attached to the operation lever surface,
By adjusting this heir, the volume moves to increase or decrease the energization of the excitation coil, making it possible to precisely control the temperature of the heated pot. In the latter case, a temperature sensor or a current sensor is provided near the excitation coil,
It detects when the temperature becomes abnormally high or when an overcurrent flows.

Problems with the background technology Cooking simmered foods is a well-known fact, but I would like to mention it here: First, water is poured into a pot, heated and brought to a boil, and then the food and seasonings are added to complete the simmering process. . The first and most important step in this series of established patterns is the boiling of water, and this is where it all begins. If some kind of countermeasure is not taken during such cooking, the amount of water that is originally planned may evaporate and reduce the amount of water, or even all of it may evaporate and end up being air-baked. . This also applies to induction heating cookers, and cannot be avoided even if an output setting device or an abnormal temperature detection device is provided. This is because although the heating temperature can be set in advance with the output setting device, once the heating temperature is set, the heating operation continues regardless of the state of the water in the pot, so no matter how precisely the temperature can be controlled, However, it cannot be used as a means to notify boiling. In addition, since the abnormal temperature detection device is designed to detect when the temperature of the pot becomes abnormally high, it must be set at a temperature higher than the boiling temperature of water that normally accompanies it. This detection stage means that dry firing has already started, and this cannot be used as a means to detect boiling. For this reason, even with induction heating cookers equipped with these devices, it is unavoidable to repeatedly boil, add water, and heat, which is a waste of energy, and there is always the risk of dry cooking. It was extremely dangerous to wear it.

Purpose of the Invention In conventional induction heating cookers, although there was a means for detecting information from the heating source side, there was no means for directly obtaining information from the heated side, so it was not possible to notify boiling of the solution in the container. This invention directly detects the temperature of the water in the pot, which is the heated side, and alerts you to boiling, which is an important step in simmering cooking. An object of the present invention is to provide an induction heating cooker that can prevent the transition to

Summary of the Invention In order to achieve the above object, the present invention generates an eddy current in a pot using electromagnetic induction to directly heat the pot, and operates an output setting knob that can variably adjust the heating temperature by controlling the current. In an induction heating cooker that has a panel, a temperature sensor is installed to constantly see through the temperature of the water filled in the pot, and an alarm is installed to determine whether the water has boiled based on the output from this sensor and notify you of this. Furthermore, a timer is provided to stop this notification after a certain period of time, but to continue the heating operation even after the notification is stopped.

As an embodiment of the invention, in addition to the configuration of the invention described above, when the water in the pot boils, the temperature of the water is measured again after a predetermined time from that point, and if the temperature of the water still does not drop, the heating operation is forced. It is equipped with an automatic stop device that automatically stops the heating operation when the temperature drops by placing vegetables or other ingredients in between.

Secondly, instead of the automatic stop device of the above invention, an automatic heating throttle device is provided which weakens the heating power instead of stopping the heating when the temperature of the water does not drop. It is something.

Furthermore, thirdly, in the above invention, instead of the means of stopping the notification by the tie-l-, the pot is removed from the cooker regardless of the time factor, or the output setting of the operation panel is This configuration includes a detection device that does not terminate the notification when the knobs such as 1 are moved.

Embodiment of the Invention A preferred embodiment of the induction heating cooker according to the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, 1 is an excitation coil wound around an iron core, and 2 is a pot exemplifying a dedicated container having a base plate structure on a hot plate that serves as a range cover. Excitation coil 1
is connected to a commercial power supply via a drive circuit 5 controlled by the main control circuit 4, is energized by a start switch 6 provided in the main control circuit 4, and has an output setting variable by a knob on the operation panel. The amount of energization is increased or decreased depending on the resistance value of the device 7. Note that 8 is a current sensor connected to the main control circuit 4 via an abnormality detection circuit 9, and is provided so as to always see through excessive energization of the excitation coil 1.

The magnetic flux generated by the energization of the excitation coil 1 passes through the bottom of the pot 3, and an eddy current flows due to electromagnetic induction.
It is configured to generate heat directly in the pot 3. on the other hand,
In contrast to the heating control section consisting of the above-mentioned main control circuit 4, drive circuit 5, current sensor 8, and abnormality detection circuit 9, an alarm circuit section 10 having a completely different circuit is provided inadvertently. The notification circuit section 10 includes a temperature sensor 11, a temperature detection circuit 12, an amplifier circuit 13, and a speaker 14.

The temperature sensor 11 is, for example, a contact-type temperature sensor that detects the temperature of a solution when it is immersed in a solution such as water filled in the pot 3 or a solution such as soup stock that has been boiled with seasonings or vegetables, or Various cheaper pyroelectric infrared sensors can be considered that can monitor the temperature of the solution surface in a non-contact manner without immersing it in the solution, but any of these can detect the temperature of the solution inside the pot 3, and the output is electrical. It is acceptable as long as it can be taken out. The temperature sensor 11 is attached to the temperature detection circuit 12 so that it can be mechanically or electrically connected to and separated from the temperature detection circuit 12, and its detection output is amplified by the output of a comparator 12a1 provided in the temperature detection circuit 12 serving as a notification means. It is connected to the comparator 12a of an amplifier circuit 13 and a speaker 14 that is driven by the circuit and outputs a notification sound. This comparator 12a compares the detection output of the temperature sensor 11 with a predetermined temperature, that is, 100°C, which is the boiling temperature of water, and determines whether the detection output has reached 100°C, and outputs an output at 100°C or higher. It is configured as follows. Temperature detection circuit 1
2 is also provided with a timer 12b serving as time-limited alarm stopping means, and is configured to cut off the input to the amplifier 13 or the speaker 14 after a certain period of time has elapsed since the output of the comparator 12a was output. 15 is provided in the temperature detection circuit 12,
This is a start switch for starting the notification circuit section 10, and this switch and the start switch 6 of the heating control section mentioned above are interlocked. Thus, the notification circuit section 1o simply switches the start switch 6 to the heating control section.
．． Since the heating control unit is connected to the chisel through the control unit 15, there is no extraneous operation or influence operation, and therefore the heating control section has its own uniqueness and can stop its heating operation only by its own control system.

The operation of the notification circuit section 1o of the device having the above configuration will be explained with reference to the operation chart of FIG. 2.

When the start switch 15 is pressed, the notification circuit section 10
is energized, but it is first determined in step A whether or not to notify that the solution in the pot 3 has boiled. This is done by checking whether the temperature sensor 11 is connected to the temperature detection circuit 12. If "NO", the loop continues until the temperature sensor 11 is connected, that is, "YES". These judgments and the like are all executed by the temperature detection circuit 12. If "YES", the detection output of the temperature sensor 11 is constantly compared with the comparator 12a, and as shown in step B, it is determined whether the solution has boiled or not. If "NO", the process loops until it reaches 100'C, and if "YES", the process proceeds to the next step C, where the timer is activated and outputs the comparator 12a until it counts up to 100'C. This output is sent to the speaker 14 via the amplifier circuit 13 to notify that the water has boiled. The count time of the timer 12b determines the length of the notification from the speaker 14, and the notification from the speaker 14 is stopped when the timer 12b is turned off. Note that the heating operation by the heating control unit continues even after the notification from the speaker 14 is made.

Therefore, once the temperature sensor 11 is set, the solution in the pot is constantly monitored, and when it boils, it is immediately notified through the speaker 14, so even if you are far away from the cooker, you can know when it has boiled and avoid dry cooking. This allows you to prevent accidents and improve safety, allowing you to move on to the next cooking step without wasting time or energy. Further, since the notification automatically stops after a certain period of time, there is no need to manually reset the notification, and since the heating operation continues even if the notification does not occur, it does not interfere with cooking.

FIG. 3 shows another embodiment of the induction heating cooker according to the present invention with expanded functions.
The most important point is that by adopting a configuration that incorporates the central processing unit 16 instead of the central processing unit 16, various executions become possible. This basic configuration includes a central processing unit 16, two memories 17 capable of time-sharing operations that provide calculation instructions and data to the central processing unit 16, and the central processing unit 16.
The input/output circuit 18 is connected to the input/output circuit 18. This input/output circuit 18 has input terminal devices such as a temperature sensor 11 that detects the temperature of the solution in the pot 3, a detection device 19 that detects the presence or absence of the pot 3 on the top plate 2, and a heating output, that is, a heating temperature. An output setting device 7 is connected. Also,
Outlet 20 and power switch 2 as output terminal devices
A drive circuit 22- that connects the commercial frequency power supplied through the excitation coil 1 to the excitation coil 1, and a speaker 14 that emits a notification sound.
is connected.

Here, the contents of calculations in the central processing unit 16 when five aspect data are given to the memory 17 will be presented.

First, the central processing unit 16 is provided with means for notifying the boiling of the solution through the speaker 14 based on the detection output from the temperature sensor 11, and for stopping this notification after a certain period of time without interrupting the continuation of the heating operation. A time-limited alarm means, and an excitation coil that is activated when the solution temperature does not decrease by more than a certain temperature, for example, by 10°C or more, with respect to the maximum temperature detected within a predetermined time after the solution boils or after the alarm stops. 1
An embodiment including at least three means including a heating stop means for cutting off the energization by controlling the drive circuit 22 will be presented, and its operation will be explained based on FIG. When the power switch 21 is turned on, each system operates or enters an initial state standby state. Next, each step will be executed. In step A, the magnitude of the heating output is determined by reading the data obtained from the output setting device 7, and the drive circuit 22 is turned on as shown in step B with a predetermined output based on this data. Next, place pot 3 on top plate 2.
It is determined by the detection device 19 whether or not it is placed. If "No", the drive circuit 22 is turned off to save energy (step D), and the process returns to step B. After returning, turn on the drive circuit 22 again.
It is determined whether the remodulation 3 is placed, and if "YES", the output setting device 7 data to continue the heating operation is read, or the process returns to step A or proceeds to the next step E. In step E, the temperature sensor 1 detects the temperature of the water in the pot 3.
1, that is, it is determined whether the temperature probe is inserted or not.

If 'NO' here, the process returns; however, the above judgment, in other words, the judgment as to whether or not to notify boiling is determined depending on whether or not the temperature globe 11 is connected to the input/output circuit 18.

°If -YES' in step E, it is determined in the next step F whether the temperature is ]OO'C, that is, it has boiled, and if "No", the loop continues until it boils, and if "YES"
``In other words, when boiling occurs, the speaker 14 sounds for a predetermined period of time (
Step G). This execution is performed by a notification means and a time-limited notification stop means.

Next, after the speaker 14 is stopped or after a certain period of time after the water boils without going through step G, the process proceeds to step H, but here, it is assumed that food is put in the boiling pot and the temperature has decreased as a result. In other words, it is determined whether the user remembers to move on to the next cooking stage. If the temperature does not drop
If the answer is "No", it is determined that if the heating is continued any further, dry firing will occur, and after turning off the drive circuit 22 and cutting off the energization of the excitation coil 1, the detection operation is terminated in the same way as in the case of "Yes".Such execution is performed. The heating stop means will be in charge of this.In the case of the above-mentioned flow that does not pass step G, a specific measure is to activate a timer at the same time as the boiling, and make the determination in step H within the set time of this timer. It is possible to do so.

In the second aspect, instead of the first heating stop means, a heating reduction means is provided which reduces the energization of the excitation coil 1 when the solution temperature does not decrease by a certain temperature or more within a predetermined time after the water boils. This is the case if it is adopted. In other words, in this case, step ■ in the operation flow in Figure 4 is "forcibly lowering the output".
etc., and if the result in step H is 'NO', the drive circuit 22 is not turned off, but is controlled to reduce the current in the exciting coil 1, thereby reducing the heating power.

Therefore, in the first and second aspects, even if the user misses the notification that the water has boiled, the heating operation is automatically stopped or reduced, thereby preventing or preventing the water from evaporating completely. This is extremely safe as it can delay the process and avoid dry firing.

Next, as a third aspect, a mode will be presented in which a detection alarm stop means is employed in place of the time limit alarm stop means in the first embodiment. That is, the notification by the notification means is configured to be stopped by removing the pot 3 from the top plate 2 or by detecting the operation of the output setting device 7 or the operation of another legitimate child on the operation panel surface. This operation flow will be explained based on FIG. 5, but since the steps up to step F are the same as the above-mentioned mode, the explanation will be omitted by setting flag Z. If the answer is "uYES" in step F, that is, the water boils, the process proceeds to step J and the speaker 14 is sounded.The speaker 14 continues to be sounding, and then it is determined whether or not the pot 3 has been removed (step K). This is done by the detection device 19, and if "YES", the speaker 14 is stopped and the process ends.On the other hand, if "No", it is determined whether the output setting device 7 of the operation panel or other switches, etc. have been operated. (Step L), if “No”, returns to step K and the same execution is performed again.”Y
ES'', the supino 714 is stopped and the process ends.

Therefore, since the warning is continued until the user notices that the product has boiled, it is possible to avoid dangerous situations such as dry burning.

The fourth aspect is the third one with a heating reduction means added, and its operation flow is as shown in FIG. 6, by adding step N between steps J and K, and issuing a boiling alarm, then The heating output is forcibly reduced after a predetermined period of time has elapsed. Therefore, it becomes possible to delay the evaporation of water in the pot 3 and to extremely reduce the probability of dry baking.

In a fifth aspect, in addition to the fourth aspect, an audio conversion means is provided so that the notification sound emitted from the speaker 14 after the heating output is reduced is different from the notification sound when the boiling occurs. . The operation flow is shown in FIG. 7. When boiling is detected, the speaker 14 is sounded at the frequency or amplitude of pattern 1 in step 0, and then the heating output is lowered after a predetermined period of time (step N). Following this output, the notification using pattern 1 is stopped (step P), and instead, notification using pattern 2 having a different frequency or amplitude is made to be performed by the speaker 14 (step Q).

However, in addition to continuing this notification, Steve
After executing step L, the notification according to pattern 2 is stopped in step R and the process ends. Therefore, by switching the notification sound, the dull sound can be clearly distinguished from the monotonous sound that is often missed in daily life by lx, so that the notification function can be improved as much as possible.

More than the effects of the invention, in short, the present invention exhibits the following excellent effects.

(1) A temperature sensor constantly monitors the temperature of the solution in the container, and when it reaches boiling, it is notified via the alarm means, so that it can be detected even if you are far from the cooker. Since countermeasures can be taken quickly, it is possible to eliminate waste of time and energy, and also prevent dry cooking, which not only prevents the risk of fire but also damage to the cooking device.

(2) Since the heating operation is not interrupted even after the notification is made by the notification means, cooking can be continued, and since the notification is stopped after a certain period of time, there is no need to bother with noise and you can easily cook. It will not cause any trouble.

(3) If the temperature does not drop to a certain level within a predetermined period of time after the solution boils, the energization of the excitation coil is cut off or the energization is reduced, so even if the notification is not noticed, the solution Evaporation and dry firing can be prevented or delayed, and safety can be further improved.

(4) After the notification is made by the notification means, the notification will continue unless a certain operation is performed, so even if the user does not notice it temporarily, he or she will eventually notice and return the cooker to its original safe state. This makes it possible to maintain an advantage in terms of safety management compared to systems that are left unattended in abnormal conditions.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a preferred embodiment of the induction heating cooker according to the present invention, FIG. 2 is a flowchart thereof, and FIG.
The figure is a block diagram showing another preferred embodiment of the induction heating cooker according to the present invention, and FIGS. 4 to 7 are flowcharts of four aspects executed by changing the program. In the figure, 1 is an excitation coil, 2 is a top plate, 3 is a pot which is an example of a container, 7 is an output setting device, 11 is a temperature sensor,
14 is a speaker. Representative Patent Attorney Nobuo Kinutani Figure 5 Figure 6 Figure 7

Claims (4)

[Claims] (1) The excitation coil is installed on the operation panel to directly heat a container such as a pot placed on the bottom plate by the electromagnetic induction effect caused by the magnetic flux generated by the excitation coil, and to control the heating temperature. In an induction heating cooker having an output setting device for increasing/decreasing energization, a temperature sensor detects the temperature of a solution in the heated container, and a detection output of the temperature sensor notifies boiling of the solution. An induction heating cooking appliance characterized by comprising: a notification means; and a time-limited notification stop means for stopping the notification of the notification means after a predetermined time without interrupting the continuation of the heating operation. (2) The electromagnetic induction effect caused by the magnetic flux generated by the energization of the excitation coil directly heats a container such as a pot placed on the base plate, and a control panel is provided to control the heating temperature. In an induction heating cooker having an output setting device for increasing or decreasing the energization of an excitation coil, a temperature sensor detects the temperature of the solution in the heated container, and a detection output of the temperature sensor notifies boiling of the solution. an alarm means; a time-limited alarm stop means for stopping the alarm of the alarm means after a predetermined time without interrupting the continuation of the heating operation; The induction heating cooker according to claim 1, further comprising heating stop means for cutting off the energization of the excitation coil. (3) A device that directly heats a container such as a pot placed on the top plate (by the electromagnetic induction effect caused by the magnetic flux generated by the energization of the excitation coil) is installed on the operation panel J to control the heating temperature. In an induction heating cooker having an output setting device for increasing/decreasing the energization of an excitation coil, there is provided a temperature sensor for detecting the temperature of the solution in the container to be heated, and a temperature sensor for detecting the temperature of the solution in the container according to the detection output of the temperature sensor. An alarm means for notifying boiling; a timed alarm stop means for stopping the alarm from the alarm means after a predetermined time without interrupting the continuation of the heating operation; and a decrease in the solution temperature by a certain temperature or more within a predetermined time after the solution boils. 2. The induction heating cooker according to claim 1, further comprising heating reducing means for reducing the energization of the excitation coil when the excitation coil is not activated. (4) Containers such as pots placed on the top plate are directly heated by electromagnetic induction caused by the magnetic flux generated by the excitation coil, and the excitation coil is installed on the operation panel to control the heating temperature. In an induction heating cooker having an output setting device for increasing or decreasing energization, a temperature sensor detects the temperature of a solution in the heated container, and a detection output from the temperature sensor notifies the boiling of the solution. and detection and notification stop means that stops the notification of the notification device by removing the container from the top plate or detecting the operation of the output setting device, etc. An induction heating cooker according to claims 1 to 3.