JP2000079054A - Induction heat cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a noise terminal voltage without increasing a twist number of a power source lead wire or adding a capacitor. SOLUTION: A rib 28 is extended from a bottom surface of a coil cover 15 downward, and a power source lead wire 27 is supported. The power source lead wire 27 is set apart from an induction heat coil for a constant distance. Magnetic flux density of an alternating field generated by the induction heat coil gets smaller as distance from the induction heat coil is larger. A voltage induced at the power source lead wire 27 by the alternating field generated by the induction heat coil, that is a noise terminal voltage, can thus be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction heating cooker in which power supply lead wires connected from a power supply means to an oscillation circuit board are improved.

[0002]

Conventionally, in an induction heating cooker, a power supply lead wire which is connected from the power supply means to the oscillation circuit board and supplies power to the oscillation circuit board is provided substantially at the center of the bottom of the pot as a container. Because of the necessity of passing through a thermal fuse for preventing overheating, the heater was disposed close to an induction heating coil provided at the bottom of the pan. A high-frequency current is supplied to the induction heating coil from an inverter circuit on the oscillation circuit board, and an alternating magnetic field generated by the high-frequency current causes the heating element joined to the pan to generate heat. This alternating magnetic field also generates an induced voltage in the power supply lead, which causes a problem that the noise terminal voltage of the power supply lead increases. When the noise terminal voltage rises, the noise may flow backward in the power supply line, adversely affect other devices, or damage elements on the oscillation circuit board.

Therefore, generally, in order to reduce the noise terminal voltage, the number of twists of a power supply lead wire connected from the power supply means to the oscillation circuit board is increased, and a capacitor is connected to a terminal of the power supply means on the power supply lead side. In this case, the cost of twisting the power supply lead wire is high, and a capacitor has to be added, so that the manufacturing cost is increased.

Accordingly, the present invention has been made in view of the above problems, and has as its object to provide an induction heating cooker capable of reducing the noise terminal voltage without increasing the number of twists of a power supply lead wire and without adding a capacitor. With that purpose.

[0005]

According to a first aspect of the present invention, there is provided an induction heating cooker comprising a container, an induction heating coil for induction heating the container, and an induction heating coil. An oscillation circuit board having an inverter circuit for supplying a high-frequency current, power supply means for housing a power cord, a power lead wire connecting the oscillation circuit board and the power supply means and supplying power to the oscillation circuit board, An induction heating cooker comprising: a coil cover for fixing the induction heating coil from below; a lead wire holding unit that supports the power supply lead wire and separates the power supply lead wire from the induction heating coil by a predetermined distance. , Extending to a member near the induction heating coil.

Since the magnetic flux density of the alternating magnetic field generated from the induction heating coil becomes smaller as the distance from the induction heating coil increases, the power supply lead wire is connected to the induction heating coil by a certain distance. If the lead wire holding portion to be separated is extended to a member near the induction heating coil, the voltage induced in the power supply lead wire by the alternating magnetic field generated from the induction heating coil is reduced. Therefore, the noise terminal voltage of the power supply lead can be reduced without increasing the number of twists of the power supply lead or adding a capacitor.

In order to achieve the above object, an induction heating cooker according to a second aspect of the present invention includes a container, an induction heating coil for induction heating the container, and an inverter for supplying a high-frequency current to the induction heating coil. An oscillation circuit board having a circuit, power supply means for accommodating a power cord, a power supply lead wire connecting the oscillation circuit board and the power supply means and supplying power to the oscillation circuit board, and lowering the induction heating coil. And a coil cover fixed to the induction heating coil, wherein the power supply lead wire is disposed so as to intersect the direction of the winding of the induction heating coil substantially at right angles.

According to the second aspect of the present invention, since the power supply lead wire is disposed below the coil cover so as to intersect substantially perpendicularly to the direction of the winding of the induction heating coil, the alternating magnetic field generated from the induction heating coil is provided. The direction of the magnetic field lines is almost parallel to the power supply lead, and the power supply lead is less affected by the alternating magnetic field generated by the induction heating coil, and the voltage induced on the power supply lead by the alternating magnetic field generated by the induction heating coil is reduced. . Therefore, the noise terminal voltage can be reduced without increasing the number of twists of the power supply lead wire or adding a capacitor.

According to a third aspect of the present invention, there is provided an induction heating cooker for achieving the above object, a container, an induction heating coil for induction heating the container, and an inverter for supplying a high-frequency current to the induction heating coil. An oscillation circuit board having a circuit, power supply means for accommodating a power cord, a power supply lead wire connecting the oscillation circuit board and the power supply means and supplying power to the oscillation circuit board, and lowering the induction heating coil. An induction heating cooker provided with a coil cover for fixing the power supply lead wire, and a lead wire holding portion for separating the power supply lead wire from the induction heating coil by a certain distance, comprising: Along with extending to a member in the vicinity, the power supply lead wire is arranged so as to intersect at a substantially right angle to the direction of the winding of the induction heating coil. That.

According to the third aspect of the present invention, the magnetic flux density of the alternating magnetic field generated from the induction heating coil decreases as the distance from the induction heating coil increases, so that the power supply lead wire is separated from the induction heating coil by a certain distance. If the lead wire holding portion to be separated is extended to a member near the induction heating coil, the voltage induced in the power supply lead wire by the alternating magnetic field generated from the induction heating coil is reduced. In addition, since the power supply lead wires are arranged below the coil cover so as to intersect at right angles to the direction of the winding of the induction heating coil,
Since the direction of the magnetic field lines of the alternating magnetic field generated by the induction heating coil and the power supply lead are almost parallel, the influence of the alternating magnetic field generated by the induction heating coil on the power supply lead is small. The voltage induced on the line is reduced. Therefore, the synergistic effect can further reduce the noise terminal voltage without increasing the number of twists of the power supply lead wire or adding a capacitor.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of an induction heating cooker according to the present invention will be described below with reference to the accompanying drawings. The induction heating cooker in each embodiment is a rice cooker.

First, a first embodiment of the present invention will be described with reference to FIGS. 1, 2 and 3. In the figure, 1 is a main body of the rice cooker, 2 is an outer frame which forms an outer shell of the main body 1, and a bottom plate 3 which covers an opening of the outer frame 2 and forms an outer shell of the bottom surface of the rice cooker main body 1 is fitted to the bottom. They are fixed together. In addition, a bottomed tubular pot housing 4 is disposed inside the main body 1, and a pot 5 serving as a container is detachably housed in the pot housing 4. The pan storage wall 6 forming the side surface of the pan storage section 4 is formed integrally with the outer frame 2 forming the upper part of the pan storage section 4. Then, an inner frame 7 as a coil base forming a bottom from the lower side surface of the pot housing portion 4 is provided so as to close the bottom opening of the pot housing wall 6. The pot 5 is made of aluminum, aluminum alloy, duralumin, magnesium, copper, or the like having good thermal conductivity as a main body 8 serving as a base of the pan 5, and a ferrite stainless steel or A heating element 9 made of a magnetic metal such as an iron plate is joined. Further, a flange portion 10 extending outward in the horizontal direction is formed on the upper portion of the pot 5 having a bottomed cylindrical shape. The lower surface of the flange portion 10 is placed on the upper end of the pot housing portion 4 so that the pot 5 is housed in a suspended state inside the pot housing portion 4.

An induction heating coil 11 serving as a heating means for electromagnetically heating the pan 5 is provided outside the inner frame 7 for accommodating the pan 5.
Is provided. The induction heating coil 11 corresponding to the pan heating means is configured by twisting a plurality of wires, and
Is provided so as to be wound spirally at a position where the bottom part and the lower part of the side surface of the pan 5 are heated in opposition to the above. Then, by supplying a predetermined high-frequency current to the induction heating coil 11, the heating element 9 is caused to generate heat by electromagnetic induction heating.
Is heated to heat a cooked product (rice cooked product) such as rice or water stored in the pot 5.

An inner frame 7 having an open upper surface and a bottomed cylindrical shape.
Is provided so as to be connected to the lower end of the upper opening 12 of the outer frame 2 forming the outer shell of the main body 1, and around the upper opening 12 of the outer frame 2, when a lid 51 described later is opened. A depressed portion recess 13 is formed to prevent the dew flowing down from the inner surface of the lid 51 from flowing out to the outer surface of the outer frame 2. The concave portion 13 as the dew storage portion does not necessarily have to be concave as long as the dew flowing from the inner surface of the lid 51 can be prevented from overflowing to the outer surface of the outer frame 2. Further, it is not necessary to form the recess 13 around the entire periphery of the pot 5. Inside the main body 1, there is provided a pot temperature sensor 14, which is located at the center of the inner frame 7 and detects the temperature of the pot 5 during cooking and keeping warm.

Outside the induction heating coil 11, there is provided a coil cover 15 for pressing and fixing the induction heating coil 11 against the inner frame 7 side. This coil cover 15 is an induction heating coil arranged in an annular shape when viewed from the bottom shown in FIG.
11 covers the entire outside. In the center of the coil cover 15, a convex sensor housing 16 for housing the pan temperature sensor 14 is formed, and extends from the sensor housing 16 to the periphery, and the induction heating coil 11 is A support portion 17 fixedly supported on the inner frame 7 is formed. The support portion 17 is formed in a curved shape according to the outer shape of the inner frame 7 so as to contact the outer surface of the induction heating coil 11. Further, a temperature fuse 18 for preventing overheating is provided on one side of the sensor housing 16.

The induction heating coil 11 is provided inside the main body 1.
An oscillation circuit board 21 provided with a power supply voltage detection circuit for detecting a change in the power supply voltage supplied to the main body 1 in addition to an inverter circuit for supplying a high-frequency current to the power supply and adjusting the heating output of the heating coil 11; In order to cool the heat-generating components and the like of the oscillation circuit board 21, a cooling fan 22 disposed close to the oscillation circuit board 21 and a power cord 24 with a power plug 23 are housed in a spirally wound state. A cord reel 25 serving as a power supply means and a power supply wire winding mechanism is provided.

Among them, a flat cord reel 25 for supplying power from an outlet to various electric parts (for example, an oscillation circuit board 21) inside the main body 1 is attached to a cord reel at a lower portion of a bottom 3 at a rear portion of the main body 1. The unit 19 is disposed in a horizontal state. Further, the oscillation circuit board 21 is disposed horizontally in a space 26 between the outer surface of the inner frame 7 formed in the front part of the main body 1 and the inner surface of the outer frame 2. At the bottom of the space 26, a cooling fan 22 as a blower for introducing outside air into the space 26 is provided.

Reference numeral 27 denotes a pair of power supply leads for connecting the oscillation circuit board 21 and the code reel 25 and supplying power to the oscillation circuit board 21. One of the power supply lead wires 27 is connected to the oscillation circuit board 21 from the code reel 25 via the temperature fuse 18 installed on one side of the sensor housing 16,
The other is connected directly from the code reel 25 to the oscillation circuit board 21. That is, the thermal fuse 18 is configured to cut off the supply of power to the oscillation circuit board 21 when the pot 5 is abnormally overheated. Further, as shown in FIG. 3, the coil cover 15 is fixed downwardly from the bottom of the support portion 17 of the coil cover 15 for fixing the induction heating coil 11 from below.
A plurality of lead wire holding ribs integrated with the support 17 of 15
28 are extended. The ribs 28 are provided to support and route the power supply lead wires 27 at predetermined positions, and are provided with legs 30 so that the power supply lead wires 27 do not fall down and can be easily attached. Hook-shaped locking piece at the lower end of
29 are staggered. The power supply lead wire 27 is disposed so as to be engaged with the engaging piece 29 formed on the rib 28 and to be in contact with the lower end of the leg 30 and is spaced apart from the induction heating coil 11 by a predetermined distance. Have been.

The induction heating coil 11 has a string shape, and a winding start portion 31 and a winding end portion 32 for winding around the inner frame 7 are formed at both ends thereof. In the vicinity of the winding start portion 31 and the winding end portion 32 of the induction heating coil 11, a support portion of the coil cover 15 is provided.
17 is provided, and a notch 34 for leading the end 33 closer to the start end side of the induction heating coil 11 than the winding start portion 31 to the outside of the coil cover 15 and a winding end portion 32 are guided more than the winding end portion 32. Notch portions 36 are formed in the coil cover 15 for leading out the end portion 35 on the terminal side of the heating coil 11 to the outside of the coil cover 15. 37 is the end 33, 35 of the induction heating coil 11.
It is a conductive external terminal that is crimped and fixed to the terminal.

At least in the vicinity of the winding start portion 31 and the winding end portion 32 of the induction heating coil 11, the induction heating coil 11
A heat-resistant silicone rubber adhesive member (not shown) is interposed between the
It is designed to stop fraying at the end of Eleven. Inner frame 7
The material of the coil cover 15 is a polyethylene terephthalate resin containing glass fiber which is excellent in heat resistance, and contains 10% to 20% of hollow ceramic beads (not shown) inside. The ceramic beads form an infinite number of heat-insulating spaces inside the inner frame 7 and are made of a material having improved heat insulating properties. It is designed to prevent the side from getting cold.
Reference numeral 41 denotes a ferrite member radially arranged outside the induction heating coil 11, and reference numeral 42 denotes a ferrite fixing frame for fixing the ferrite member 41 at a predetermined position. The ferrite member 41 is provided to prevent leakage of magnetic flux from the induction heating coil 11.

Reference numeral 51 denotes a lid that covers the upper surface of the main body 1. The lid 51 includes an outer lid 52 that forms the outline of the lid 51, a lid lower surface member 53 that forms the lower surface of the lid 51, and the like. Also,
The lid 51 is supported by a hinge shaft 54 provided on the rear upper side of the outer frame 2, and a hook button 55 serving as a lid locking portion is provided on the front front side of the main body 1 on the opposite side to the hinge shaft 54. Has been
By operating the hook button 55, the main body 1 and the lid 51 are
And the lid 51 is automatically opened around the hinge shaft 54.

On both sides of the outer frame 2 in front of the rear surface 56 of the lid 51, handles 57 for carrying the main body 1 are provided rotatably with respect to the outer frame 2. When the handle 57 is tilted to the rear of the main body 1, the grip of the handle 57 is mounted on a handle mounting portion 58 formed to protrude from the rear of the main body 1.

An operation panel 61 is provided on a front upper surface of the main body 1. Inside the operation panel 61, a microcomputer, a liquid crystal display (LCD), a light emitting diode display (LED), and a display substrate 62 having an operation unit are provided.

The steam port 81 is formed substantially at the center of the upper surface of the outer lid 52, and is provided detachably at the inner bottom of the concave portion 82 depressed toward the pot 5. The steam port packing 83 is made of an elastically deformable member, and is attached to the inner lid 53. A lid packing 86 is provided in an annular shape around the lid lower surface member 53 facing the upper opening of the pot 5 and serving as the lower surface of the lid 51, and closing the gap with the main body 1 when the lid 51 is closed. ing. The lid packing 86 is made of an elastically deformable member, and is specifically made of silicone rubber or fluorine rubber. When the pot 5 is provided inside the main body 1 as in the present embodiment and rice is cooked or kept warm in the pot 5, the lid packing 86 is brought into contact with the upper surface of the pan 5, and the lid 51 and the main body 1 are placed. What is necessary is just to prevent vapor from leaking out from the gap between the first and the second.

At the time of cooking rice, the pot 5 is heated by electromagnetic induction, and the amount of heating to the pot 5 is adjusted based on the temperature detected by the pot temperature sensor 14 and time management. Specifically, at the time of cooking rice, the rice to be cooked and water placed in the pan 5 are heated, and the pan temperature sensor 14 for detecting the temperature of the pan 5 is heated to a predetermined cooking temperature (for example, 120 ° C.).
℃), stop heating the rice cooker and shift to purple,
The rice cake in the hot pot 5 is cooked for 15 minutes. Heating and heating are performed subsequent to rice cooking and heating. In this heat-retaining heating, the pot 5 is heated by electromagnetic induction to adjust the heating amount of the pot 5 based on the temperature detected by the pot temperature sensor 14 and time management. The temperature is maintained at 60 ° C to 80 ° C.

Although not shown, a power supply voltage detecting means for detecting a power supply voltage supplied to the main body 1 during rice cooking and warming is provided, and the power supply voltage is detected. The current value of the heating coil 11 is adjusted so that the heating output at the time of voltage (for example, AC 100 V) is kept. For example, at the time of heat retention, the heating output of the heating coil 11 is 500 W at a rated power supply voltage of 100 V.
In the case of, even if the power supply voltage fluctuates to 90V or 110V, it is possible to keep 500W which is the heating output at the rated voltage, the difference in the power supply voltage for each home, the voltage due to the voltage drop during use, etc. Even when the temperature fluctuates, the temperature can be maintained with a stable heating amount.

As described above, in the first embodiment, the pot 5 serving as a container, the induction heating coil 11 for induction heating the pot 5,
An oscillation circuit board 21 having an inverter circuit for supplying a high-frequency current to the induction heating coil 11, a code reel 25 serving as a power supply means for accommodating a power cord 24, and an oscillation circuit board 21 connecting the oscillation circuit board 21 and the code reel 25; A power supply lead 27 for supplying power to the power supply, and a coil cover 15 for fixing the induction heating coil 11 from below, the power supply lead 27 is supported, and the power supply lead 27 is separated from the induction heating coil 11. A rib 28, which is a lead wire holding portion that is separated by a certain distance, extends from the coil cover 15 which is a member near the induction heating coil 11.

In this case, since the magnetic flux density of the alternating magnetic field generated from the induction heating coil 11 decreases as the distance from the induction heating coil 11 increases, the rib for separating the power supply lead wire 27 from the induction heating coil 11 by a certain distance. If 28 extends from the lower surface of the coil cover 15, the induction heating coil 11
, The voltage induced in the power supply lead wire 27 by the alternating magnetic field, that is, the noise terminal voltage can be reduced.

When the noise terminal voltage rises, the noise may flow backward in the power supply line, adversely affect other devices, or damage elements on the oscillation circuit board 21. In general, this noise terminal voltage In order to reduce the number of twists, measures have been taken to increase the number of twists of the power supply lead wire 27 connected from the code reel 25 to the oscillation circuit board 21 and to provide a capacitor at the terminal on the power supply lead wire 27 side of the code reel 25. .
In this case, there is a problem that the processing cost for twisting the power supply lead wire 27 is high, and a capacitor must be added, so that the manufacturing cost is increased. Without increasing the number of twists or adding a capacitor, the noise terminal voltage of the power supply lead wire 27 can be reliably reduced while the manufacturing cost is kept low.

Here, in the configuration of the first embodiment,
Table 1 shows the measured data of the relationship between the distance of the power supply lead wire 27 from the induction heating coil 11 and the noise terminal voltage of the power supply lead wire 27.
Shown in According to the measured data in Table 1, every time the power supply lead wire 27 is separated from the induction heating coil 11 by 7 mm, the noise terminal voltage decreases by about 3 dB. The noise terminal voltage of the lead wire 27 is reliably reduced.

[0031]

[Table 1]

Next, a second embodiment of the present invention will be described with reference to FIG. In the figure, the same reference numerals are given to parts common to the first embodiment, and the detailed description thereof will be omitted. Reference numeral 27 denotes a pair of power supply leads for connecting the oscillation circuit board 21 and the code reel 25 and supplying power to the oscillation circuit board 21. One of the power supply lead wires 27 is connected to the oscillation circuit board 21 from the code reel 25 via the temperature fuse 18 installed on one side of the sensor housing 16,
The other is connected directly from the code reel 25 to the oscillation circuit board 21. That is, the thermal fuse 18 is configured to cut off the supply of power to the oscillation circuit board 21 when the pot 5 is abnormally overheated. Here, the power supply lead wire 27
Is disposed below the coil cover 15 and reaches the outside of the sensor housing 16 from the code reel 25 so as to intersect at a substantially right angle with respect to the winding direction of the induction heating coil 11. Through the thermal fuse 18 on one side of the sensor housing 16 from the outer periphery of the
After reaching the vicinity of the outer frame 2 which forms the outer periphery of the rice cooker 1 so as to cross the direction of the winding 11 at a right angle, it is connected to the oscillation circuit board 21.

As described above, in the above embodiment, the pot 5 serving as a container, the induction heating coil 11 for induction heating the pot 5, the oscillation circuit board 21 having an inverter circuit for supplying a high-frequency current to the induction heating coil 11, and the like. , A power supply means for accommodating the power supply cord 24, a power supply lead wire 27 for connecting the oscillation circuit board 21 and the code reel 25 and supplying power to the oscillation circuit board 21, and fixing the induction heating coil 11 from below. Power supply lead wire
27 are arranged so as to intersect at right angles to the direction of the winding of the induction heating coil 11.

In this case, since the power supply lead wire 27 is disposed below the coil cover 15 so as to intersect at right angles to the direction of the winding of the induction heating coil 11, the induction heating coil
Direction of magnetic field lines of alternating magnetic field generated from 11 and power supply lead wire 27
Are almost parallel, the influence of the alternating magnetic field generated from the induction heating coil 11 on the power supply lead wire 27 is small, and the power supply lead wire is not affected by the alternating magnetic field generated from the induction heating coil 11.
The voltage induced at 27, that is, the noise terminal voltage can be reduced. Therefore, the noise terminal voltage of the power supply lead 27 can be reliably reduced without increasing the number of twists of the power supply lead 27 or adding a capacitor, while keeping the manufacturing cost low.

Next, a third embodiment of the present invention will be described with reference to FIG. In the figure, portions common to the first and second embodiments are denoted by the same reference numerals, and detailed description thereof will be omitted.

Reference numeral 27 denotes a pair of power supply leads for connecting the oscillation circuit board 21 and the code reel 25 and supplying power to the oscillation circuit board 21. One of the power supply lead wires 27 is connected to the oscillation circuit board 21 from the code reel 25 via the temperature fuse 18 installed on one side of the sensor housing 16,
The other is connected directly from the code reel 25 to the oscillation circuit board 21. That is, the thermal fuse 18 is configured to cut off the supply of power to the oscillation circuit board 21 when the pot 5 is abnormally overheated. As shown in FIG. 3, the coil cover 15 is fixed downwardly from the bottom of the support portion 17 of the coil cover 15 for fixing the induction heating coil 11 from below.
A plurality of lead wire holding ribs integrated with the support 17 of 15
28 are extended. The ribs 28 are provided to support and route the power supply lead wires 27 at predetermined positions, and are provided with legs 30 so that the power supply lead wires 27 do not fall down and can be easily attached. Hook-shaped locking piece at the lower end of
29 are staggered. The power supply lead wire 27 is disposed so as to be engaged with the engaging piece 29 formed on the rib 28 and to be in contact with the lower end of the leg 30 and is spaced apart from the induction heating coil 11 by a predetermined distance. Have been.

Further, the power supply lead wire 27 reaches the outside of the sensor housing 16 from the cord reel 25 so as to intersect the direction of the winding of the induction heating coil 11 substantially at right angles. The outer periphery of the rice cooker main body 1 is again crossed substantially at right angles to the winding direction of the induction heating coil 11 via the thermal fuse 18 on one side of the sensor housing 16 from the outer periphery of the rice cooker 16. After reaching the vicinity of the outer frame 2, it is connected to the oscillation circuit board 21.

As described above, in the above embodiment, the pot 5 serving as a container, the induction heating coil 11 for induction-heating the pot 5, the oscillation circuit board 21 having an inverter circuit for supplying a high-frequency current to the induction heating coil 11, and the like. A power supply lead wire 27 for connecting the oscillation circuit board 21 and the code reel 25 and supplying power to the oscillation circuit board 21;
A coil cover 15 for fixing the induction heating coil 11 from below, a rib serving as a lead wire holding portion for supporting the power supply lead wire 27 and separating the power supply lead wire 27 from the induction heating coil 11 by a certain distance. 28 extends not only from the lower surface of the coil cover 15 which is a member near the induction heating coil 11, but also so that the power supply lead wire 27 crosses the winding direction of the induction heating coil 11 substantially at right angles. Have been placed.

Also in this case, since the magnetic flux density of the alternating magnetic field generated from the induction heating coil 11 decreases as the distance from the induction heating coil 11 increases, the power supply lead wire 27 is separated from the induction heating coil 11 by a certain distance. Rib 28,
If it extends from the lower surface of the coil cover 15, the induction heating coil
The voltage induced in the power supply lead wire 27 by the alternating magnetic field generated from 11, that is, the noise terminal voltage can be reduced.

Further, the power supply lead wire 27 is connected to an induction heating coil.
Since it is arranged so as to intersect at right angles to the direction of the winding of 11, since the direction of the magnetic force lines of the alternating magnetic field generated from the induction heating coil 11 and the power supply lead wire 27 are substantially parallel,
The influence of the alternating magnetic field generated by the induction heating coil 11 on the power supply lead wire 27 is small, and the voltage induced on the power supply lead wire 27 by the alternating magnetic field generated by the induction heating coil 11, that is, the noise terminal voltage can be reduced. Due to these synergistic effects, in this embodiment, the power supply lead wire 27
Without increasing the number of twists or adding a capacitor, the noise terminal voltage of the power supply lead wire 27 can be reduced more reliably while the manufacturing cost is kept low.

It should be noted that the present invention is not limited to the above embodiments, and various modifications can be made within the scope of the present invention. For example, the extending position of the rib 28 is not limited to the position shown in the embodiment, but may be extended to any member near the induction heating coil.

[0042]

According to a first aspect of the present invention, there is provided an induction heating cooker including an oscillation circuit board having a container, an induction heating coil for induction heating the container, and an inverter circuit for supplying a high-frequency current to the induction heating coil. Power supply means for accommodating a power cord, a power supply lead wire for connecting the oscillation circuit board and the power supply means and supplying power to the oscillation circuit board, and a coil cover for fixing the induction heating coil from below. In the induction heating cooker provided with, a lead wire holding portion that supports the power supply lead wire and separates the power supply lead wire from the induction heating coil by a fixed distance is extended to a member near the induction heating coil. It is possible to reduce the noise terminal voltage of the power supply lead without increasing the number of twists in the power supply lead or adding a capacitor. .

According to a second aspect of the present invention, there is provided an induction heating cooker comprising: a container; an induction heating coil for induction heating the container; an oscillation circuit board having an inverter circuit for supplying a high-frequency current to the induction heating coil; Power supply means for accommodating a power cord, a power supply lead wire for connecting the oscillation circuit board and the power supply means and supplying power to the oscillation circuit board, and a coil cover for fixing the induction heating coil from below. In the induction heating cooker, the power supply lead wires are arranged so as to intersect at a substantially right angle with respect to the direction of the winding of the induction heating coil, thereby increasing the number of twists of the power supply lead wires or adding a capacitor. Without reducing the noise terminal voltage.

According to a third aspect of the present invention, there is provided an induction heating cooker comprising: a container; an induction heating coil for induction heating the container; an oscillation circuit board having an inverter circuit for supplying a high-frequency current to the induction heating coil; Power supply means for accommodating a power cord, a power supply lead wire for connecting the oscillation circuit board and the power supply means and supplying power to the oscillation circuit board, and a coil cover for fixing the induction heating coil from below. In the induction heating cooker, a lead wire holding portion that supports the power supply lead wire and separates the power supply lead wire from the induction heating coil by a predetermined distance is extended to a member near the induction heating coil. In addition, the power supply lead wire is disposed so as to intersect at a substantially right angle to the direction of the winding of the induction heating coil, and the number of twists of the power supply lead wire is Increasing or without adding a capacitor, it is possible to further reduce the noise terminal voltage.

[Brief description of the drawings]

FIG. 1 is an overall sectional view of an induction heating type rice cooker showing a first embodiment of the present invention.

FIG. 2 is a bottom view in a state where the upper bottom plate is removed.

FIG. 3 is an enlarged perspective view of the vicinity of the rib.

FIG. 4 is a bottom view of the induction-heated rice cooker according to the second embodiment of the present invention, with a bottom plate removed.

FIG. 5 is a bottom view of the induction-heated rice cooker according to the third embodiment of the present invention, with a bottom plate removed.

[Explanation of symbols]

 5 Pan (container) 11 Induction heating coil 15 Coil cover 21 Oscillator circuit board 24 Power cord 25 Code reel (power supply means) 27 Power lead 28 Rib (lead holding part)

 ────────────────────────────────────────────────── ─── Continued on the front page F term (reference) 4B055 AA02 AA09 BA13 BA22 BA32 CA01 CA19 CA68 CB07 CB24 CB30 CC01 CC04 CC10 CC12 CC16 CC68 CD69 CD73 DA01 DB14 DB15

Claims (3)

[Claims] 1. A container, an induction heating coil for induction heating the container, an oscillating circuit board having an inverter circuit for supplying a high-frequency current to the induction heating coil, a power supply means for accommodating a power cord, and the oscillation An induction heating cooker comprising a power supply lead wire for connecting a circuit board and the power supply means and supplying power to the oscillation circuit board, and a coil cover for fixing the induction heating coil from below, wherein the power supply lead wire is An induction heating cooker, wherein a lead wire holding portion that supports and separates the power supply lead wire from the induction heating coil by a predetermined distance is extended to a member near the induction heating coil. 2. A container, an induction heating coil for induction heating the container, an oscillating circuit board having an inverter circuit for supplying a high-frequency current to the induction heating coil, a power supply unit for storing a power cord, and the oscillating device. An induction heating cooker comprising a power supply lead wire for connecting a circuit board and the power supply means and supplying power to the oscillation circuit board, and a coil cover for fixing the induction heating coil from below, wherein the power supply lead wire is An induction heating cooker, wherein the induction heating cooker is disposed so as to intersect substantially perpendicularly to a direction of a winding of the induction heating coil. 3. An oscillation circuit board having a container, an induction heating coil for inductively heating the container, an inverter circuit for supplying a high-frequency current to the induction heating coil, a power supply means for accommodating a power cord, and the oscillation device. An induction heating cooker comprising a power supply lead wire for connecting a circuit board and the power supply means and supplying power to the oscillation circuit board, and a coil cover for fixing the induction heating coil from below, wherein the power supply lead wire is A lead wire holding portion for supporting and separating the power supply lead wire from the induction heating coil by a predetermined distance is extended to a member near the induction heating coil, and the power supply lead wire is connected to the induction heating coil. An induction heating cooker characterized by being arranged so as to intersect at a substantially right angle to a direction of a winding.