JPS5893185A - 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 Technical Field of the Invention 911) Regarding the safety of an induction heating cooker consisting of a heating coil and a heating coil, more specifically, It relates to something that can reliably detect the boiling state of water without relying on human hands.

Technical background and problems with induction heating GSM, consisting of a top plate on which the expander tube is placed, and a heating filter that heats the dog:f rate.
This is a guide to heating the object to be heated within the vessel through the rate and volume. However, when the object to be heated is water, the following problems arise depending on the boiling state of the water in the container. First, 11!・If a large amount of water boils over, there is a risk that the electrical parts room installed below the dog grate will be flooded, increasing the risk of electric shock etc. due to deteriorated insulation of electrical parts.Induction heating 11M141 The 0th order leading to the damage of
If you leave the bottle at boiling point, the water in the container will evaporate and reduce, resulting in wasted electricity. If you leave a bottle of boiling water in the east, the water in the container will There is a danger that all of the water will evaporate and the food will be left uncooked, which could lead to a fire.

The purpose of the book @ Ming was to solve the problems mentioned above, and its purpose was to detect and notify the boiling status of water in the water by sound, and to avoid dangerous situations. Induction heating that can prevent the situation from occurring
is to provide.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in Figure 1 (1 is a top plate, on which a container 2 is placed, and below it a heating coil 3 for heating the top plate 1 is installed.Heating coil) 3. The drive circuit 4, which is the drive means, is connected to the power source via the power switch 5 and the outlet 6. A microphone 1 is installed near the container 2, and its output @ is connected to an amplifier 8. On the output side of the amplifier III 8, a frequency analysis (2) path S and a peak detection path S are connected in parallel. and the output of the AND circuit 11 is connected to the control circuit 1.
Connected to 2. The output 4jU of the control circuit 12 is connected to the speaker 13 which is a notification child, and the output 4jU of the control circuit 12 is
1gJIMI4 is also connected.

Next, we will describe the function of the present invention. When a large amount of water in the container 2 is heated and boiled, water boils from the container 2 and collapses, but the water flows down the outer surface of the container 2. , enters between the dog plate 1 and the container [62]. At this time, since the top grate 1 and the container 2 are at high temperatures, the broken water is evaporated. In this case, if there is a small amount of Kohorero water (1), the heat energy for evaporation will be large, causing a loud sound like "putty, ) koo". The installed microphone T collects various sounds, converts them into electrical signals, and outputs them.

However, its output is amplified by amplifier-8, and frequency analysis-path 9
In the 1-frequency analysis circuit 9 which enters the peak detection circuit 15le, it is determined by 1kIfU whether the sound is the above-mentioned putty putty or not, and only when the sound is that sound, it is sent to the signal tube AND circuit 11. Peak detection 10 determines whether or not the sound is above a quantitative value, and outputs a signal tANDl@path 11 only when the sound is above a quantitative value. AND circuit 11 line frequency analysis (2) path 8 and peak detection! 10. A signal is output to the control circuit 12 only when both output signals are received.
Upon receiving the signal from the circuit 11, first the S, B force 13 is applied.
The alarm circuit 1 is still activated even after a predetermined period of time has elapsed after the speaker 13 is activated and a sound is played to call attention to the speaker 13.
When the signal from 1 continues, K sends a signal to the drive circuit 4 to stop its operation lIl i5< p1 stops driving the heating coil 3. Therefore, when the user is away, the drive circuit a2
When water is boiled from the boiler, the spinica 13 will notify that the water is boiling, and the heat source will automatically stop without any action being taken by the user.

In this way, it is possible to detect a small amount of water boiling and to prevent a large amount of water from boiling, thereby preventing the risk of electric shock due to insulation deterioration caused by water ingress of electrical parts. , Hoki! i! In the example, Yong 4! Although the case has been described in which the sound emitted when a small amount of water boiling from I2 is rapidly heated and evaporated, the present invention is not limited to this, and can also be applied to detecting the sound of boiling water in the case 2. can also be applied. The electric circuit used in this case can be constructed as shown in FIG.
- a memory circuit 15t connected to the input/output circuit 14, a CPU l6 (central control circuit), a speaker 13,
A selection switch 11 for selecting whether or not to use the function that notifies the boiling of water, an output setting device 18 for setting the output of the speaker 13, and a drive circuit 4 are connected, and the configuration is the same as that of the previous embodiment. has been done. When the water in the mackerel 2 rises by 1 degree and approaches the boiling point, a sluggish sound is produced, but when this sound is captured by the microphone T and converted into an electrical signal, a waveform as shown in Figure 3 is obtained.・It is clear from the waveform that the above sound becomes louder as it approaches the boiling point (100°C). If we reshape this waveform so that it can be seen as a potential level, #! The waveform will be as shown in Figure 4.゛The partially prominent parts of this waveform are the sounds that are not to be detected (human voices), and the fact that there is a slight potential level even though it is not boiling at all is due to the usual surroundings. This is the noise. This 5. By comparing the gradually increasing potential level with a preset potential, it is determined whether or not the water is boiling.

These operations are performed by the input/output circuit 14, CPU 1g, and memory circuit 15. It was determined to be boiling II
Similarly to the above-mentioned embodiment, K is notified through the speaker 3, and furthermore, the drive circuit Oe is stopped. In addition, do not use YjAII's work for sudden loud sounds such as human voices.
Therefore, it is determined that boiling occurs only when the peak level is a predetermined value. ・Also, even if the boiling temperature is the same, the boiling sound will change in size depending on the driving strength of the heating coil 3. It is necessary to know in advance the potential level of the boiling sound when the drive of No. 3 is weak, and use that level as the set value, or to change the set value in conjunction with the strength of the drive of the heating coil 3. be. According to this embodiment, boiling of the water in the container 2 can be known reliably and easily, so that it is possible to avoid waste of electricity and the risk of dry cooking.

Effects of the Invention According to the present invention, which is clear from the above explanation, the following effects are achieved: (1) By installing a microphone near the container, the boiling state of water in the container can be detected by sound. (2) Water is boiling! Since the microphone is detected, the pipe notification means is used to notify the user, and the heating is stopped, it is possible to prevent insulation deterioration of electrical parts caused by boiling water, and to prevent dangers such as electric shock. .

(3) The control circuit causes the driving means of the heating coil to stop after a predetermined period of time has elapsed since the alarm hand R was activated.
Highly safe.

(4) By detecting the boiling of water in the container with a microphone, it is possible to prevent the container from going into a dangerous state of dry cooking.

(5) Since the detection is based on sound, there is no need for any operation such as putting the detector into the water, and the operation is extremely simple and provides an excellent effect.

[Brief explanation of the drawing]

Summary Figure 1 shows an embodiment of the induction heating cooker according to the present invention! Lock diagram, Figure 2 line Two lock diagram showing another embodiment of the induction heating-S mackerel according to the present invention, Figure 3 is a waveform diagram showing the output signal of the microphone in the embodiment of Figure 2 %JIB
Fig. 4 is a waveform diagram showing a shaped waveform of Fig. 3; In the figure, 1#i) is a tag rate, 2 is a container, 3 is a heating coil, 4#i is a driving means, T is a microphone, 12 is a control circuit, and 13 is a notification means.

Claims (1)

[Claims] 1. A top grade on which fluency is placed, and the top/f
Induction heating IIl consisting of a heating coil that heats the rate
An induction heating device characterized in that the container 41 is equipped with a microphone for detecting the boiling state of water in the container. 2. Induction heating 1 according to claim 1i1E1, wherein a notification means is provided on the output side of the microphone.
gg1iis. 3. The one-conductor heating regulator according to claim 1, wherein a drive means capable of stopping the drive tube of the heating coil is connected to the output side of the microphone. 4. Between the output side of the microphone and the notification means and drive means, after the notification means is activated! Claims [Claim E2 or F! Induction heating described in Section 3 - field assembly