JPS6310547B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an induction heating cooker used in general households.

BACKGROUND ART Conventionally, this type of induction heating cooker, as shown in FIG.
, a control circuit 3 for the inverter 2, a magnetic shielding layer 4 composed of several ferrite cores and provided below the heating coil 1 to reduce unnecessary radiation, a bobbin 5 provided in the center of the heating coil 1, and a magnetic shielding layer 4 for reducing unnecessary radiation. It has generally been equipped with a coupling coil 6 that is wound and electromagnetically coupled to the heating coil 1 and supplies power to the control circuit 3.

Problems to be Solved by the Invention In such a conventional configuration, since the bobbin 5 is required, the number of parts increases, and the coupling coil 6 is required.
Since it has an air core, the magnetic flux density within the coupling coil 6 becomes low, as shown by the flow of magnetic flux in Figure 5, and it becomes necessary to increase the diameter of the coupling coil 6 or increase the number of turns. . Therefore,
There was a problem that the amount of copper wire required for the coupling coil 6 was large, increasing the cost.

In view of the above problems, the present invention eliminates the need for a dedicated bobbin, increases the magnetic flux density in the coupling coil without adding any parts, and reduces the amount of copper wire required for the coupling coil, thereby achieving low-cost induction. It provides a heating cooker.

Means for Solving the Problems In order to achieve this object, the induction heating cooker of the present invention includes a heating coil, an inverter that supplies a high frequency current to the heating coil, a control circuit for the inverter, and the heating coil. a magnetic shielding layer provided below to reduce unnecessary radiation, and a coupling coil that is electromagnetically coupled to the heating coil and supplies power to the control circuit, the coupling coil being wound around the magnetic shielding layer. It is.

Effect: This configuration eliminates the need for a bobbin for winding the coupling coil, and increases the magnetic flux density within the coupling coil, thereby reducing the amount of copper wire required for the coupling coil.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, 7 is a heating coil that heats the pot B, 8 is an inverter that supplies high-frequency current to the heating coil 7, 9 is a control circuit for the inverter 8, and 10 is composed of four ferrite cores. A magnetic shielding layer 11 is provided below the heating coil 7 to reduce unnecessary radiation. A coupling coil 11 is wound around the magnetic shielding layer 10 and is electromagnetically coupled to the heating coil 7 to supply power to the control circuit 9.

In the above configuration, the heating coil 11 can be wound around the magnetic shielding layer 10 without a bobbin. Further, as shown in the flow of magnetic flux in FIG. 1, the magnetic flux density of the magnetic shielding layer 10 is increased, so that the amount of copper wire required for the coupling coil 11 can be reduced.

In this embodiment, the coupling coil 11 is provided at only one location on the magnetic shielding layer 10, but of course the coupling coil 11 may be provided at two or more locations. FIGS. 3 and 4 show other embodiments of the present invention. In this embodiment, the magnetic shielding layer 10 is constituted by a circular plate having a notch 12 in which a coupling coil 11 is wound. In this case, the same effects as the embodiments shown in FIGS. 1 and 2 can be obtained, and the number of parts can be further reduced.

Effects of the Invention As is clear from the above, the induction heating cooker of the present invention supplies power to the control circuit by electromagnetically coupling the heating coil to a magnetic shielding layer provided below the heating coil to reduce unnecessary radiation. By winding the coupling coil, there is no need for a bobbin.
By increasing the magnetic flux density within the coupling coil and reducing the amount of copper wire required in the coupling coil without adding any additional components, a low cost induction cooker can be provided.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an induction heating cooker showing one embodiment of the present invention, Fig. 2 is a bottom view thereof, and Fig. 3 is a sectional view of a coupling coil and a magnetic shielding layer showing another embodiment of the invention. , FIG. 4 is a bottom view thereof, and FIG. 5 is a sectional view of the induction heating cooker showing the conventional technology. 7... Heating coil, 8... Inverter, 9...
Control circuit, 10... Magnetic shielding layer, 11... Coupling coil.

Claims (1)

[Claims] 1. A heating coil, an inverter that supplies high-frequency current to the heating coil, a control circuit for the inverter, a magnetic shielding layer provided below the heating coil to reduce unnecessary radiation, and a magnetic shielding layer that is electromagnetically coupled to the heating coil to control the control circuit. and a coupling coil for supplying power to a circuit, the coupling coil being wound around the magnetic shielding layer.