JP2957810B2 - Electromagnetic cooker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Conventionally, as disclosed in Japanese Patent Application Laid-Open No. 4-2082, a top plate is arranged above a heating coil, and a pot is placed on the top plate. Had been heated.

[0003]

In the above conventional example,
When cooking dishes such as oden and stew, use a deep pot with a pot bottom, but when heating such a pot, the temperature difference between the upper part and the lower part of the pot becomes large because it is heated only from the pot bottom. I couldn't cook properly. So, usually, the cook is cooking and cooks very clearly, or if the cooking time is long, they may temporarily leave the place, but come back regularly and stir in the pot In addition, it was necessary to eliminate uneven heating in the upper and lower portions.

[0004] The present invention solves such a problem.

[0005]

According to the present invention, there is provided a top plate on which a pan is placed.
And a heating device disposed under the top plate of the main body.
A coil and a power supply coil disposed on the outer periphery of the heating coil
And place it on the body so that it can be removed
Adapter and the heating coil or the feeding coil
A power supply unit for supplying power to the heating coil and
A switch for alternately connecting the power supply coil to the power supply unit
Control the switching connection, the power supply and the switching connection
And a controller that controls the magnetic coupling.
Facing the above feeding coil to receive power supply
Receiving coil arranged so as to be connected to the receiving coil
And an auxiliary heating device placed on the side of the pan to induce induction heating.
A heat coil; and the control unit includes the power feeding coil.
When the power consumed by the
Stop the alternate switching of the connection part and select the heating coil
It is configured to connect and supply power .

[0006]

The power supply coil and the power receiving coil of the electromagnetic cooker body 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 of the pot placed in the auxiliary heating coil. When the adapter is not used for cooking in a frying pan, for example, the adapter is detachable from the electromagnetic cooker body for use. This adapter
Is determined by the power feeding coil.
Judgment is made based on whether power is consumed. Adap
When the control unit determines that the
Instruct the switching connection to switch to heating only the heating coil
I have.

[0007]

FIG. 1 shows a control circuit of an electromagnetic cooker.

A power supply circuit 1 includes a full-wave rectifier 1b connected to a commercial AC power supply 1a, a choke coil 1c connected to one end of an output of the full-wave rectifier 1b, and a choke coil 1c and a full-wave rectifier 1b. It is composed of a smoothing capacitor 1d connected to the other end, and produces DC power by smoothing commercial power.

Reference numeral 2 denotes an inverter circuit for switching the DC power supply and converting the DC power to the public power. The inverter circuit includes a series circuit of a heating coil 3 and a resonance capacitor 4 connected in parallel to the smoothing capacitor 1d, and a parallel circuit with the resonance capacitor 4. It comprises a switching element 5 such as an IGBT connected thereto and a diode 6 antiparallel to the switching element 5. The inverter circuits other than the heating coil 3
It corresponds to the feeding unit.

The heating coil 3 is formed of an inner heating coil 3a wound on the inner side and an outer heating coil 3b wound on the outer side. A power supply coil 7 for supplying power to an adapter described later is connected in parallel to the inner heating coil 3a. The feeding coil 7 is usually wound outside the outer heating coil 3b, and depending on whether or not to energize a relay coil 8a of a relay 8 serving as a switching connection portion connected between the choke coil 1c and the heating coil 3, The contact 8b, the inside heating coil side, and the power feeding coil side are switched.

Reference numeral 9 denotes a control circuit for controlling the driving power of the inverter circuit 2, and reference numeral 10 denotes a connection point between the heating coil 3 and the switching element 5, and turns on the switching element 5 in synchronization with the resonance cycle of the inverter circuit 2. An ON signal generating circuit 11 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 it to the control circuit 9. When the oscillation stop signal of the inverter circuit 2 is input,
A starting circuit for starting the triangular wave generating circuit 11 to start the oscillation of the inverter circuit 2, a current transformer 13 for detecting an input current of the inverter circuit 2, and an on / off signal 14 for the switching element 5 based on 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 generation circuit 11 and the detection signal of the current transformer 13, and outputs a periodic on / off signal to the relay 8 during the oscillation of the inverter circuit 2, so that a contact is made. Switching.

During the oscillation of the inverter circuit 2, the relay 8
, When the oscillation of the inverter circuit 2 is stopped,
The relay 8 is operated after a lapse of a fixed time (from 0.2 seconds to 0.5 seconds). This is because if the oscillation is stopped and the relay 8 is operated immediately, the resonance operation may be transiently continued in the inverter circuit 2.
This is because an arc is generated at the contact, and there is a possibility that a contact failure may occur or contact welding may occur. Then, after the operation of the relay 8 has elapsed, the oscillation of the inverter circuit 2 is started again after a lapse of time during which chattering stops.

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

A control unit 21 provided with a control circuit 9 and the like is provided in the lower part of the electromagnetic cooker main body 15, a heating coil 3, a heating coil base 22 for supporting the heating coil, and a heating unit. A power supply coil 7 attached to the outer periphery of the coil 3 and the back surface of the pan mounting table 18 with silicon or the like is provided at an upper portion.

Reference numeral 23 denotes an adapter for heating the side surface of the pot 24 placed on the top plate 20, and has a substantially donut shape having a central portion penetrating therethrough.

The adapter 23 is provided with a pan 2
4 for placing the pan 4 thereon, an inner side surface portion 25 shaped substantially along the side surface of the pan 24, an upper engaging portion 27 which engages with an upper outer peripheral edge 26 of the pan 24, an outer side surface portion 28, and a pan mounting plate 18. It comprises a lower concave portion 29 fitted to the convex portion 19 and a support surface portion 30 that contacts the pot placing plate 18 and supports the adapter 23.
The outer surface of the adapter 23, that is, the inner side surface portion 25, the upper engaging portion 27, the outer side surface portion 28, the lower concave portion 29, and the support surface portion 30
Uses, for example, a polyethylene terephthalate resin having good heat resistance.

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

The width of the support surface 30 is set to
The width of the projections 19 and the top plate 20 is made substantially equal to each other, and is formed so as to be engaged by being placed.

In the operation of such a configuration, first, the contact 8b of the relay 8 is switched to the outer heating coil 3b side, and when the oscillation stop signal is output from the control circuit 9 to the start circuit 12, the start circuit 12 starts. A signal is output, and the triangular wave generating circuit 11 is activated by the signal. When the triangular wave generated by the triangular wave generating circuit 11 is supplied to the control circuit 9, the control circuit 9 outputs a short-term control signal to the driver circuit 14. The driver circuit 14 generates an ON signal based on the control signal, turns on the switching element 5, and supplies a short-time driving current to 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 heating pot 24 to heat the pot 24.

Thereafter, 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 diode 6 via the smoothing capacitor 1d.

At this time, the potential of the anode side of the diode 6, that is, the potential at the connection point between the heating coil 3 and the switching element 5 decreases. 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 an eddy current is generated in the pot to heat it.

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

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

Thereafter, for example, after a lapse of one minute, the contact 8b of the relay 8 is switched to the power feeding coil side, and power is supplied to the power feeding coil 7 and the outer heating coil 3b. At this time, the adapter 23
Is not mounted, the current value detected by the current transformer 13 does not increase. Therefore, the control circuit 9 determines that there is no adapter 23, switches the contact 8b of the relay 8 to the inner heating coil side, and performs the continuous heating operation. .

When the heating is started by installing the adapter 23 on the outer periphery of the pan 24, the supply of the electric power to the heating coil 3 and the feeding coil 7 is performed 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 in a predetermined cycle (for example, every 10 seconds when cooking rice).

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

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

Numeral 34 denotes a power sign display portion indicating that the heating is being performed by the auxiliary heating coil 32. The display unit 34
Is a coil 3 wound one turn around the outer periphery of the power receiving coil 31.
5, when power is supplied to the power receiving coil 31, a voltage is simultaneously induced in the coil 35, and the coil is turned on by the induced voltage.

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

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

[0031]

According to the present invention, since the bottom and sides of the pan are heated, uneven heating of the upper and lower portions of the pan is eliminated, and the user does not need to stir the heated material in the pan during cooking. This enhances usability.

[Brief description of the drawings]

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

FIG. 2 is a sectional view when the electromagnetic cooker, the adapter, and the pan of the present invention are placed.

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

[Explanation of symbols]

 15 Electromagnetic cooker body 23 Adapter 31 Receiving coil 32 Auxiliary heating coil

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Ikuko Ashida 2-18-18 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Masaaki Kaneshiro 2--18 Keihanhondori, Moriguchi-shi, Osaka (56) References JP-A-63-236288 (JP, A) JP-A-59-35387 (JP, A) JP-A-3-184291 (JP, A) (58) Fields investigated ( Int.Cl. ⁶ , DB name) H05B 6/12

Claims (1)

(57) [Claims] 1. A book having a top plate on which a pot is placed
Body and a heating coil arranged under the top plate of the body
And a power supply coil disposed on the outer periphery of the heating coil.
An adapter that is detachably placed on the main body and covers the pot
Power to the heating coil or the feeding coil
Power supply unit for supplying power, the heating coil and the power supply coil.
Switching connection to alternately connect to the power supply unit
And a control unit for controlling the power supply unit and the switching connection unit.
The adapter consists of a magnetic coupling
In order to receive power supply,
The receiving coil arranged in the
Auxiliary heating coil placed on the side of the pot for induction heating
And the control unit consumes power in the power supply coil.
When the power to be supplied is smaller than a predetermined value,
Stop alternate switching and connect selectively to the heating coil
An electromagnetic cooker characterized by supplying electric power by using an electric heater.