JPS6063892A - Electromagnetic induction heating cooking device - Google Patents

Abstract

(57) [Abstract] 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 electromagnetic induction cooking device.

Conventional devices are equipped with a small object detection circuit that detects the current flowing through the heating coil when a small object such as a knife, fork, or spoon is placed on top of it, and cuts off the current flowing through the heating coil when the current is small. This is an important safety device that prevents small objects from heating up and causing burns if people accidentally touch them without realizing it. However, because of this safety device, even if you try to warm up small items such as canned drinks such as canned coffee, the small object detection circuit is activated and there is no way to warm them up. In view of this point, the present invention has been developed so that the conventional safety device is still attached.
To provide an electromagnetic induction heating cooker which can heat even small items and prevents the small items from being heated due to a safety device if they are placed carelessly. Embodiments will be described in detail below with reference to the drawings.

The drawing is a block circuit diagram showing one embodiment of the present invention. In the drawing, 1 is a power supply, 2 is an input detection element, and the detection output thereof is inputted to a level detection circuit 4 via a rectifier circuit 3. A variable resistor 5 is used to set the level of the level detection circuit 4. 6 is a self-holding circuit to which the output of the circuit 4 is input.

Note that the level detection circuit 4 does not output an output signal when the input is large, and outputs an output signal when the input is small. 7 is an inverter circuit, 8
is an oscillation circuit, 9 is the inverter circuit 72, and oscillation circuit 8.
10 is a heating coil, 11 is a cooking device to be heated such as a pot, 12 is an input adjustment coil, 13 is a timer motor, 14 is a timer motor switch, and 15 is a normally closed timer switch.

In the above configuration, when the pot is normally turned on, the input power is large, the output of the input detection element 2 and the rectifier circuit 3 is also large, and the level detection circuit 4 does not emit a signal. Therefore, the self-holding circuit 6 does not operate, the oscillation circuit 8 continues to oscillate, and the output from the inverter device 9 to the heating coil 10 continues. Even if the input to the heating coil 10 is reduced by the input adjustment coil 12, the setting variable resistor 5 of the level detection circuit 4 is linked, so the level detection circuit 4 still does not produce an output and the inverter device outputs no output. Continue.

Next, when heating small items such as canned drinks, the input power is very small and the output of the rectifier circuit 3 is also small, so the level detection circuit 4
generates a signal. Therefore, if you use a conventional heating cooker,
The self-holding device works to stop the operation of the oscillation circuit 8 and the output of the inverter circuit 7, thereby stopping the heating of small objects.In the present invention, the timer motor 1 is used as the power source.
3 and the timer switch 14, and the normally closed timer switch 15 linked to this is inserted and connected to the wire connecting the self-holding circuit 6 and the oscillation circuit 8.Then, set the timer to the time required to warm up the canned beverage. Once set, the timer switch 14 is turned on, the timer motor 13 is started, and the normally closed timer switch 15 is turned off, cutting off the self-holding circuit and preventing the oscillation circuit 8 from oscillating. First, the output of the inverter circuit 7 does not stop. The small items are therefore heated. When the set time has elapsed, the timer switch 14 is turned OFF and the timer switch 15 is turned ON, and at the same time as the timer motor stops, the output of the self-holding circuit 6 is input to the excavation circuit 8, and at the same time as the oscillation stops, the inverter circuit 7 is turned on. The output also stops and heating of small items ends.

As explained above, according to the present invention, by adding a timer for heating small items, it is possible to heat any small items that could not be heated with conventional electromagnetic induction heating cookers, and it also improves safety. The effect of further expanding the scope of use without any damage is significant. Also, since it uses a timer, it will automatically return to its original state once the small items have finished heating, so there is no risk of making a mistake.

[Brief explanation of drawings]

The drawing is a block circuit diagram showing one embodiment of the present invention. 1... Commercial AC power supply, 2 - Input detection element, 3 - Rectifier circuit, 4... Level detection circuit, 5... Variable resistor, 6
...Self-holding circuit, 7...Inverter circuit, 8...
Oscillation circuit, 10... Heating coil, 12... Input adjustment coil, 13... Timer motor, 14... Timer motor switch, 15-... Normally closed timer switch.

Claims (1)

[Claims] The electromagnetic induction heating circuit is provided with a means for detecting the load condition, a means for detecting the level of the detected signal, and a self-holding circuit, and the level detecting means changes the detection level in conjunction with the output adjusting means of the inverter. An induction heating cooker equipped with a timer, one end of a normally closed switch operated by the timer is connected to an output terminal of a self-holding circuit, and the other end is connected to an input terminal of an oscillation circuit. Cooking device.