JPS58108688A - Induction heater - 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 device, such as an electromagnetic cooker, having a plurality of heating ports.

Technical background of the invention and its problems For example, induction heating devices such as electromagnetic cookers tend to be used frequently. Among this type of devices, there are large ones that are equipped with a plurality of heating coils facing a top plate that constitutes a main body. That is, the top plate is provided with a plurality of heating ports, and the object to be heated placed on each can be heated.

By the way, if the object to be heated, for example, a pot, is not placed correctly on the top plate, it may be placed out of alignment with respect to the heating port. If the steel is applied to two or more heating ports, the heating coils facing each other will operate simultaneously.

If the user does not notice, the settings of each power control will continue to be incorrect, leading to cooking failures, and if the remaining power capacity is used for other appliances, the power capacity will be reduced. If you run out of water, you will be in an extremely dangerous situation.

OBJECTS OF THE INVENTION An object of the present invention is to provide an induction heating device that can detect the deviation of an object to be heated with respect to a heating port and improve heating operability and safety.

Summary of the Invention The present invention provides a plurality of load detection elements located between a plurality of heating ports provided in the top plate and outside the heating range of the heating coil to detect the object to be heated. When the heating coil is placed out of alignment with the heating port, the load detection element detects this and controls the heating coil.

EMBODIMENTS OF THE INVENTION The two flow sides of the present invention will be explained below based on the drawings. In the figure, 1 is the main body of an induction heating device which is a porcelain cooker.

The upper surface of the main body 1 is closed by a top plate 2 and an operation plate 3.

The top plate 2 has, for example, four heating ports 4a.
or 4d is drawn. These heating ports 4a to 4d are arranged in an orderly manner both vertically and horizontally on the top plate 2. In addition, adjacent heating ports 4a and 4b, 4b and 4c, and 4c and 4
A total of five load detection elements 5a to 5d, which are microswitches, are provided at the d positions and at the center position. The respective operating terminals of these load detection elements 5a to 5d protrude from the top plate 2 toward the upper surface thereof. Also, a heating coil 6a is provided in the main body 1 facing each of the heating ports 4a to 4d.
6d are arranged. In other words, the heating coil 6a
The heating ports 4a to 4d4 are located in positions facing each other and have the same diameter. Therefore, the load detection elements 5a to 5d and the heating coil 6
The relative positions of a to 6d are exactly the same as those of heating ports 4a to 4d.

The electric circuit of the induction heating device constructed in this way is shown in FIG. That is, the load detection elements 5a to 5d are directly connected. 7 is a rectifier, 8
A to 8d are drive circuits for the heating coils 6a to 6d.

Therefore, it is necessary to correctly place the object to be heated on one of the heating ports 4a to 4d and operate the switches on the operation panel 3.
As a result, the heating coils 6a to 6d facing the heating ports 4a to 4d on which the object to be heated is placed are excited, and the object to be heated is heated by induction.

For example, as shown by the two-dot chain line in FIG. 2, the object to be heated S is large and may be erroneously placed in a state where a portion thereof is covered by the heating coils 6a and 6b. In this case, the object to be heated S turns off the load detection element 5a. That is, the particular electric circuit shown in FIG. 3 is constructed, and all heating coils 6a to 6d are demagnetized. Even if the object to be heated is correctly placed in another position and normal induction heating is performed, the heating action will be interrupted.

For this reason, there is no mistake in power control, and power capacity for other appliances can be secured.

If an object to be heated is placed on any of the other load detection elements 5b to 5e, it will be turned off, the heating operation of all the heating coils 6a to 6d will be stopped, and if the object to be heated is removed, the original state will be restored. Of course, it will return to the state of .

The positions and numbers of the heating coils 6a to 6d and the heating ports 4a to 4d are not limited, and are essentially the same number.
And as long as they are facing each other correctly. The number of load detection elements 5a to 5d is not limited, and it is sufficient that they are interposed between the heating ports and located outside the heating range of the heating coil.

Note that in the above embodiment, any one of the load detection elements 5
Although all the heating coils 6a to 6d are demagnetized when a to 5d are turned off, the present invention is not limited to this. For example, the load detection element and the heating coil may be connected in series with each other to demagnetize one heating coil. It is also possible to use a circuit that selects and turns on only one heating coil and turns off other heating coils. Effects of the Invention The present invention determines whether or not the object to be heated is placed correctly with respect to the heating port, and then adjusts the power of the heating coil. Control is possible, there is no failure during electromagnetic cooking, and operability is improved, and four-source capacity is ensured to improve safety.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a perspective view of an induction heating device, FIG. 2 is a schematic cross-sectional plan view of the main part, and FIG. 3 is an electric circuit diagram. 2...Top plate, 6a, 6b, 6c, 6d...
・Heating coil, 4h, 4b, 4c, 4d... heating port,
5 a, 5 b, 5 c, 5 d, 5
e = load detection element.

Claims (1)

[Claims] The top plate is provided with heating ports facing a plurality of heating coils, and a load detection element is provided between the heating ports and outside the heating range of the heating coils to control the heating coils. induction heating device.