JPH0629082A - Electromagnetic cooking apparatus - Google Patents

Abstract

PURPOSE:To eliminate unevenness in heating in the upper part and the lower part relative to each other by winding an aux. heating coil around the sides of a deep pan to be heated, and installing a current receiving coil and the aux. heating coil in such a way removable from the body of a cooking apparatus concerned. CONSTITUTION:When electric power is supplied to a current feed coil 7, a high frequency voltage is induced in a current receiving coil 3 to be in electromagnetic coupling, and the voltage is, as it is, supplied to an aux. heating coil 32, in which a magnetic field is generated in the same manner as in a heating coil 3. When magnetic field is generated, eddy currents are generated at the side faces of a deep pan 24 to conduct heating. Thus the bottom of the pan 24 is heated by the heating coil 3 while the sides are heated by the aux. heating coil 32 to permit the pan 24 to be heated uniformly regardless of its part either upper or lower, and risk of uneven heating can be eliminated. This eliminate the user is work stirring the inside of the pan during cooking with resultant enhancement of the easiness in handling.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adapter used in an electromagnetic cooker.

[0002]

2. Description of the Related Art Conventionally, as disclosed in JP-A-4-2082, a top plate is arranged above a heating coil, and a pan is placed on the top plate so that It was heating.

[0003]

In the above-mentioned conventional example,
When cooking dishes such as oden and stew, a deep pot with a deep pot bottom is used.When heating such a pot, however, it is heated only from the bottom of the pot. There was unevenness and I could not cook well. Therefore, the person who cooks the food usually cooks it and cooks it thoroughly, or it may leave the place temporarily if the cooking time is long, but periodically returns to stir in the pot. It was necessary to eliminate uneven heating at the top and bottom.

The present invention solves this problem.

[0005]

[Means for Solving the Problems] The means for solving the above problems comprises a main body having a heating coil, and an adapter which is detachably mounted on the main body and covers the periphery of a heated pot. The adapter comprises a power receiving coil that receives power supply by magnetic coupling with a power feeding coil of the main body, and an auxiliary heating coil that is connected to the power receiving coil and is provided so as to face the side surface of the pan to be heated. Is.

[0006]

In other words, the power feeding coil and the power receiving coil of the main body of the electromagnetic cooker are magnetically coupled, and the alternating voltage induced by the power receiving coil is directly supplied to the auxiliary heating coil. In the auxiliary heating coil, a magnetic field is generated by the alternating voltage, and the magnetic field heats the side surface of the pan to be heated placed in the auxiliary heating coil. Further, when the adapter is not used for cooking in a frying pan or the like, for example, it is detachable so that it can be removed from the main body of the electromagnetic cooker for use.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 shows a control circuit of an electromagnetic cooker.

Reference numeral 1 denotes a power supply circuit, which is a full-wave rectifier 1b connected to a commercial AC power supply 1a, a choke coil 1c connected to one end of the output of the full-wave rectifier 1b, a choke coil 1c and a full-wave rectifier 1b. It is composed of a smoothing capacitor 1d connected to the other end and smooths a commercial power source to produce a DC power source.

Reference numeral 2 denotes an inverter circuit for switching the DC power supply to convert it into a high frequency power supply. A series circuit of a heating coil 3 and a resonance capacitor 4 connected in parallel to the smoothing capacitor 1d, and a resonance capacitor 4 connected in parallel. The switching element 5 is formed of an IGBT or the like, and the diode 6 is antiparallel to the switching element 5.

The heating coil 3 is formed of an inner heating coil 3a wound inside and an outer heating coil 3b wound outside. Further, a feeding coil 7 for supplying electric power to an adapter described later is connected in parallel to the inner heating coil 3a. The power feeding coil 7 is usually wound outside the outer heating coil 3b, and depending on whether or not the relay coil 8a of the relay 8 connected between the choke coil 1c and the heating coil 3 is energized, the contact 8b and the inner heating are heated. Switching to the coil side and the power feeding coil side. Although the feeding coil 7 is separately provided in this embodiment, the heating coil 3 may also serve as the feeding coil.

Reference numeral 9 is a control circuit for controlling the drive power of the inverter circuit 2, 10 is connected to the connection point between the heating coil 3 and the switching element 5, and the switching element 5 is turned on in synchronization with the resonance cycle of the inverter circuit 2. An ON signal generating circuit for generating an ON signal for generating a triangular wave in synchronism with the ON signal from the ON signal generating circuit 10 and supplying the control signal to the control circuit 9. 12 is a control signal from the control circuit 9. When the oscillation stop signal of the inverter circuit 2 is input,
A starter circuit that starts the triangular wave generation circuit 11 to start the oscillation of the inverter circuit 2, 13 is a current transformer that detects the input current of the inverter circuit 2, and 14 is an ON / OFF signal of the switching element 5 according to a control signal from the control circuit 9. It is a driver circuit that outputs. The control circuit 9 outputs a control signal based on the triangular wave of the triangular wave generating circuit 11 and the detection signal of the current transformer 13, and also outputs a periodic on / off signal to the relay 8 during oscillation of the inverter circuit 2 to contact the contacts. Are switching.

The relay 8 is oscillated while the inverter circuit 2 is oscillating.
When operating the, stop the oscillation of the inverter circuit 2,
The relay 8 is operated after a certain time (0.2 seconds to 0.5 seconds) has elapsed. This is because when the relay 8 is operated immediately after the oscillation is stopped, the resonance operation may be transiently continued in the inverter circuit 2,
This is because an arc may be generated at the contact point, causing a contact failure and contact welding. After the operation of the relay 8, the oscillation of the inverter circuit 2 is started again after the time when the chattering is settled.

In FIGS. 2 and 3, reference numeral 15 denotes an electromagnetic cooker main body, which includes a lower case 16, an upper cover 17 covering the lower case 16 and having an opening at the center, and the upper cover 17. For example, the pot mounting plate 18 is formed so as to be closed and is made of polyethylene terephthalate resin. The pot mounting plate 18 is provided with a convex portion 19 on the outer periphery and a concave portion at the center, and a ceramic top plate 20 for supporting the pot is fitted therein. The top plate 20 is attached so as to project from the pot mounting plate 18 by about 2 mm.

Further, inside the main body 15 of the electromagnetic cooker, a control section 21 provided with a control circuit 9 and the like is provided in the lower part, a heating coil 3, a heating coil base 22 for supporting the heating coil, and a heating coil. A power feeding coil 7 is provided on the outer periphery of the coil 3 and on the back surface of the pan placing table 18 by bonding with silicon or the like.

Reference numeral 23 is an adapter for heating the side surface of the pot 24 placed on the top plate 20, which is substantially doughnut-shaped and has a central portion penetrating therethrough.

The adapter 23 has a pan 2 at the central penetrating portion.
The inner side surface portion 25 having a shape substantially along the side surface of the pot 24, the upper engaging portion 27 that engages with the edge portion 26 of the outer periphery of the upper portion of the pot 24, the outer side surface portion 28, and the pot mounting plate 18 for mounting the pan 4. It is composed of a lower concave portion 29 that fits into the convex portion 19 and a supporting surface portion 30 that is in contact with the pan placing plate 18 and supports the adapter 23.
The outer contour of the adapter 23, that is, the inner side surface portion 25, the upper engagement portion 27, the outer side surface portion 28, the lower recess portion 29, the support surface portion 30.
For example, polyethylene terephthalate resin having good heat resistance is used.

On the back surface of the support surface portion 30, the power receiving coil 3 is electromagnetically coupled to the power feeding coil 7 and receives power supply.
1 is wound, and further, on the back surface of the inner side surface portion 27, an auxiliary heating coil 32 connected to the power receiving coil 31 is wound. The power receiving coil 31 and the auxiliary heating coil 32 are supported by an L-shaped coil stand 33 having a substantially L-shaped cross section.

The width of the support surface portion 30 is determined by the pot mounting plate 1
The widths of the protrusions 19 and the top plate 20 are substantially the same, and they are formed so as to engage with each other when placed.

In the operation of such a structure, first, the contact 8b of the relay 8 is switched to the outer heating coil 3b side, and then, when the oscillation stop signal is output from the control circuit 9 to the starting circuit 12, the starting circuit 12 is started. When a signal is output, the triangular wave generation circuit 11 is activated by the signal, and the triangular wave generated by the triangular wave generation circuit 11 is supplied to the control circuit 9, the control circuit 9 outputs a short-time control signal to the driver circuit 14. The driver circuit 14 generates an ON signal based on the control signal to turn on the switching element 5, and causes a short-time drive current to flow through the heating coil 3. At this time, a magnetic field is generated in the heating coil 3, and an eddy current is generated in the pot 24 to be heated for heating.

After that, when the output of the ON signal is stopped, the switching element 5 is turned off, and the electric charge charged in the resonance capacitor 4 is discharged. This discharge current flows through the heating coil 3 in reverse, and flows through the smoothing capacitor 1d to the diode 6.

At this time, the potential of the anode side of the diode 6, that is, the connection point between the heating coil 3 and the switching element 5 decreases, and the ON signal generating circuit detects this decrease and outputs an ON signal. When the ON signal is output, the switching element 5 is turned on again, and the above operation is repeated.
By repeating this operation, the oscillation is continued and the pan is heated by generating an eddy current.

The heating output is adjusted by detecting the input current by the current transformer 13 and adjusting the length of the control signal from the control circuit 9 so that it becomes a predetermined value when it exceeds a predetermined value. There is.

Further, within a predetermined time, the current transformer 13
If the current value detected by does not rise above a certain value, pan 24
When the control circuit 9 determines that is not mounted, the ON signal to the switching element 5 is stopped, and the oscillation of the inverter circuit 2 is stopped.

After a lapse of one minute, for example, the contact 8b of the relay 8 is switched to the side of the power feeding coil to energize the power feeding coil 7 and the outer heating coil 3b. At this time, the adapter 23
If is not placed, the current value detected by the current transformer 13 does not rise, so the control circuit 9 determines that there is no adapter 23 and switches the contact 8b of the relay 8 to the inner heating coil side for continuous heating operation. .

When the adapter 23 is installed on the outer periphery of the pot 24 and heating is started, the electric power is supplied to the heating coil 3 and the feeding coil 7 by the inner heating coil 3a, the outer heating coil 3b, and the outer heating coil 3b. The power supply coil 7 is alternately repeated for a predetermined period (for example, every 10 seconds if rice cooking is performed).

When power is supplied to the power feeding coil 7,
A high frequency voltage is induced in the power receiving coil 31 that is electromagnetically coupled,
Since the voltage is supplied as it is to the auxiliary heating coil 32, a magnetic field is generated in the auxiliary heating coil 32 as in the heating coil 3. When a magnetic field is generated, an eddy current is generated on the side surface of the pot 24 to heat it.

In this manner, the bottom of the pot 24 is heated by the heating coil 3 and the side of the pot 24 is heated by the auxiliary heating coil 32, so that the pot 24 is heated uniformly regardless of the upper and lower portions of the pot 24 to eliminate uneven heating. can do.

Reference numeral 34 is a power sign display portion showing that the auxiliary heating coil 32 is heating. The display unit 34
Is the coil 3 wound around the outer circumference of the power receiving coil 31 only once.
When the electric power is supplied to the power receiving coil 31 by being connected to the No. 5, the voltage is also induced in the coil 35 at the same time, and the voltage is applied to turn on the light.

Since the edge portion 26 of the pot 24 and the upper engaging portion 27 of the adapter 23 are engaged, the pot 24 is also lifted when the adapter 23 is lifted, and only the adapter 23 cannot be easily removed during heating. It is hard to be mischievous.

The support surface portion 30 of the adapter 23 is
Since it engages with the concave portion formed between the convex portion 19 of the pan placing plate 18 and the top plate 20, the pan 24 does not slide down from the electromagnetic cooker body 15 even if it is slightly shaken left and right.

[0031]

EFFECTS OF THE INVENTION According to the present invention, since the bottom and side of the pan are heated, there is no uneven heating at the top and bottom of the pan, and the user does not need to stir the heated material in the pan during cooking. , The usability is improved.

[Brief description of drawings]

FIG. 1 is a control circuit diagram of an electromagnetic cooker according to the present invention.

FIG. 2 is a cross-sectional view of the electromagnetic cooker, the adapter, and the pot of the present invention when placed.

FIG. 3 is an external perspective view of an electromagnetic cooker, an adapter, and a pot of the present invention.

[Explanation of symbols]

 15 Electromagnetic cooker body 23 Adapter 31 Power receiving coil 32 Auxiliary heating coil

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ikuko Ashida 2-18 Keihan Hondori, Moriguchi City, Osaka Prefecture Sanyo Electric Co., Ltd. (72) Masaaki Kaneshiro 2-18-18 Keihan Hondori, Moriguchi City, Osaka Sanyo Denki Within the corporation

Claims (1)

[Claims] 1. A main body having a heating coil, and an adapter which is detachably mounted on the main body and covers the periphery of the pot to be heated, the adapter being a power supply coil of the main body for magnetically connecting electric power. An electromagnetic cooker comprising: a power receiving coil that receives supply; and an auxiliary heating coil that is connected to the power receiving coil and that is provided so as to face the side surface of the pan to be heated.