JPH01130491A - Induction heating cooking apparatus - Google Patents

Abstract

PURPOSE:To prevent burn due to touching a top plate unintentionally by informing with an information device when the top plate is hot with the conducted heated. CONSTITUTION:When a pan 1 is heated, a top plate 3 becomes hot with the conducted heat, and the temp. of the top plate 3 is sensed by a temp. sensing element 7, and signal is sent to a control circuit 5. If the temp. sensed by this temp. sensing element 7 is over a certain value when the pan 1 taken away from the top plate, the control circuit 5 gives output to an alarm 16, which calls attentions. This prevents burn due to touching the top plate.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an induction cooking device that utilizes electromagnetic induction heating.

Conventional technology In a conventional induction heating cooker, the object to be heated, such as a pot, is placed on a top plate, and a high-frequency current is passed through a heating coil built into the main body to generate a high-frequency magnetic field. Eddy current was generated in pots, etc. to heat them. It has a pot detection function that stops heating when a pot, etc. is removed from the top plate. What's more, there was also an indicator light that displayed only when heating was in progress.

Problems to be Solved by the Invention However, in the conventional configuration, if a pot, etc. is removed from the top plate during heating, the pot detection function is activated and heating stops.1 At this time, the surface of the top plate Although it is hot due to conduction heat from the pot that was being heated, it looks the same as if it were cold, and the heating indicator lamp was also off, so there was a problem that people could accidentally touch it and get burns. SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to prevent burns from touching a hot top plate.

Means for Solving the Problems In order to achieve the above object, the present invention includes a top plate 1 on which an object to be heated is placed, a temperature sensing element that is pressed into contact with the back surface of the top plate, and a temperature sensing element on which an object to be heated is placed. A heating coil for inductively heating the heated object, a control device for controlling the heating coil, and a temperature sensing element for determining the presence of the heated object when the heated object is not placed. The device also includes a notification device that notifies you when the detected temperature exceeds a certain value.

Function According to the above configuration, when the heated object detection function is activated, that is, when the heated object such as a pot is removed from the top plate during heating, the temperature sensing element that is in pressure contact with the top plate When the detected temperature is above a certain value, the notification device notifies you that the top plate is getting hot.

Therefore, since caution is required, there is no chance of getting burned by touching the top plate.

Embodiment The following describes an induction heating cooker according to an embodiment of the present invention.
This will be explained using figures. Reference numeral 1 denotes a pot, which is an object to be heated, containing water or the like, and is heated by being placed on a top plate 3 forming the upper surface of the main body 2 of the induction heating cooker. Inside the main body 2, there is a heating coil 4 that generates a high-frequency magnetic field, and a heating coil 4 that generates a high-frequency magnetic field.
A board 6 including a control circuit 6 for flowing a high frequency current to the
Furthermore, there is a temperature sensing element 7 arranged on the back surface of the top plate 3 so as to be in pressure contact with it from below.

Next, the circuit configuration of this embodiment will be explained with reference to FIG. That is, 10 is an alternating current power source, and this alternating current power source 1o is provided with a current transformer 11, which is a type of object-to-be-heated detection device that detects the presence or absence of the pot 1 based on an input current. Further, the AC power source 10 is converted into DC by a rectifier circuit 12. On the DC side of the rectifier circuit 12, a heating coil 4 for inductively heating the pot 1, a resonant capacitor 14, and a switching element 13 are provided.
is connected. The switching element 13 is turned on and off by the output from the control circuit 6, and causes a high frequency current to flow through the heating coil. 15 is a power switch. Reference numeral 16 denotes an alarm, which is notified by the output of the control circuit 6.

In the above configuration, when the pot 1 is placed on the top plate 3 and the power switch 15 is turned on, a high frequency current flows through the heating coil 4 to heat the pot 1.

When the pot 1 is heated, the top plate 3 also becomes hot due to conduction heat. The temperature of the top plate 3 is detected by a temperature detection element 7, and a signal is sent to the control circuit 5.

On the other hand, the current transformer 11 also outputs a current detection signal because current is flowing through the AC power supply 10 circuit. If there is no output from the current transformer 11 (that is, when the pot 1 is removed from the top plate) and the temperature detected by the temperature detection element 7 exceeds a certain value, the control circuit 5 outputs an output to the alarm 16. , and an alarm 16 is issued to alert the driver.

At this time, even if the power switch 15 is turned off,
The power supply for the temperature detection element 7 and the control circuit remains the same, and notification can be continued.

Effects of the Invention As is clear from the description of the embodiments above, according to the present invention, when the top plate becomes hot due to conduction heat from a pot, etc., the notification device notifies the top plate, so that the top plate is inadvertently It also prevents burns from touching the plate.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of an induction heating cooker according to an embodiment of the present invention, and FIG. 2 is a sectional view of the same side. 1...Pot, 3...Top plate, 5
...control circuit, a...temperature detection element,
11...Current transformer, 16...Alarm.

Claims (1)

[Claims] A top plate on which a heated object is placed, a temperature detection element pressed against the back surface of the top plate, a heated object detection device for determining the presence or absence of a heated object, and a heating coil for inductively heating the heated object. , an induction heating device comprising a control device that controls the heating coil, and a notification device that notifies you when the object to be heated is not placed and the temperature detected by the temperature detection element exceeds a certain value. Cooking device.