WO2004016048A1 - Chauffage electronique a induction - Google Patents

Chauffage electronique a induction Download PDF

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Publication number
WO2004016048A1
WO2004016048A1 PCT/KR2003/001605 KR0301605W WO2004016048A1 WO 2004016048 A1 WO2004016048 A1 WO 2004016048A1 KR 0301605 W KR0301605 W KR 0301605W WO 2004016048 A1 WO2004016048 A1 WO 2004016048A1
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WO
WIPO (PCT)
Prior art keywords
conductor
iron core
plate shaped
heater
length
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2003/001605
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English (en)
Inventor
Hak-Min Kim
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to AU2003248499A priority Critical patent/AU2003248499A1/en
Priority claimed from KR10-2003-0055220A external-priority patent/KR100468410B1/ko
Publication of WO2004016048A1 publication Critical patent/WO2004016048A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/12—Cooking devices
    • H05B6/1209—Cooking devices induction cooking plates or the like and devices to be used in combination with them
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers

Definitions

  • the present invention relates to an electronic induction heater, and in particular to an electronic induction heater which is capable of decreasing a resistance and eddy loss using a bundle conductor formed in multiple layers instead of a Litz wire and preventing a loss occurring due to a circulation current by twisting an intermediate portion of a winding bundle conductor and riveting the same at a certain length.
  • the present invention relates to an electronic induction heater of a cooking container capable of induction-heating a cooking container using a high frequency wave magnetic field.
  • a cooling utensil represents various vessels such as a steel, aluminum, tungsten, glass, Chinese, etc.
  • the present invention is directed to a patent invention based on a Korean priority of the patent application No. 2002-46979(filing date is August 9, 2002).
  • Figure 1 is a view for describing a principle of an induction heater.
  • a conventional induction heating container is directed to supplying a high frequency wave current from an inverter circuit to a heating coil, and generating a magnetic field of a high frequency wave above minimum 20kMz in a heating coil for thereby induction-heating a cooling container.
  • FIG. 2 is a view illustrating the construction of a control circuit of an electronic induction heater.
  • a transistor cooling fan motor 3 and a primary coil 4a of a transformer are connected with a power 1 through a switch 2.
  • a direct current power circuit 5 is connected with the power 1 through the switch -2.
  • the DC(Direct Current) power circuit 5 is formed of a choke coil 7 and a smoothing condenser 8.
  • an inverter circuit 10 is connected with an output terminal of the DC power circuit 8 in series.
  • the inverter circuit 10 is formed of a SEEP circuit and bipolar transistors 11 and 12 which are capable of implementing a switching operation at a frequency of 20kHz.
  • a series resonant circuit formed of a heating coil 13 and a condenser 14 is connected between an interconnection point of the transistors 11 and 12 and a terminal N.
  • a high frequency wave current is supplied to the heating coil 13 by driving the transistors 11 and 12
  • a high frequency magnetic field is generated, and an eddy current is generated in the cooling container 20.
  • a heating is implemented by the current for thereby heating the food in the interior of the cooking container 20.
  • Figure 3 is a perspective view illustrating a conventional electronic induction heater
  • Figure 4 is a view illustrating a bottom portion of Figure 3.
  • the conventional electronic induction heater includes a casing 30, a heating apparatus which is formed in such a manner that an enamel coated copper wire of 0.5 ⁇ which is a winding conduction wire capable of heating based on a magnetic field in the interior, is twisted in multiple pieces, an electric wire 31 for supplying power, and a ceramic plate 33 for mounting a temperature adjusting unit 32, a power switch 34 and a cooling container 20.
  • a magnetic flux 48 is formed in a lower portion of the cooling container 20 placed on the ceramic plate 33 which is an upper side of the casing 30, and a high frequency wave magnetic field is formed for thereby implementing a magnetic heating. At this time, it is possible to accurately control a heating temperature using a temperature adjusting unit 32.
  • a substrate 42 formed of a plastic or nonconductor and a radial shaped iron core 46 are attached to a bottom portion of the casing 30.
  • one winding conductor is formed by twisting an enamel coated Litz wire in multiple layers in an upper portion of the substrate, and an electronic induction heater is formed of a steel wire in a bottom portion of the substrate.
  • the Korean patent publication No. 1990-2388 discloses an electronic induction heater using a metallic plate.
  • the above heater is directed to an industrial purpose, not for a home heater.
  • the Korean patent of Dual full bridge type electronic induction heater (filed by LG corporation of Korea and Lain open on February 1 , 1999) is directed to implementing a low noise cooking operation by removing an interference noise which occurs between the heating plates based on a time sharing control with respect to a large capacity electronic induction heater having two or four heating plates.
  • the above heater is implemented by improving an electronic circuit and must disadvantageously heat multiple heaters.
  • the conventional electronic induction heater uses a Litz wire as a conductor.
  • the conductor is constructed in the same construction as an inner surface of a conductor on which a steel wire attached to a lower surface of a substrate is wound.
  • a zone current of a high frequency a large cross section area is needed.
  • the number of pieces of Litz wires is increased, so that it is impossible to implement a desired twist system.
  • the insulation is gradually increased as the time is passed, so that a conductor may be damaged.
  • the above construction may operate as one conductor.
  • the number of pieces of Litz wires exceeds 50, a desired twist system is not implemented.
  • the length of an inner side end of a steel wire is the same as the width of an upper winding bundle conductor, a magnetic region of a magnetic flux flowing into an inner side end of the steel wire is offset with an inner side surface of the conductor, so that a certain heat is generated.
  • the instruction may be destroyed by an eddy loss of a Litz wire, a current and a vibration of a conductor itself.
  • an object of the present invention to overcome the above conventional problems. It is another object of the present invention to provide an electronic induction heater which is capable of maximum decreasing a loss of a circulation current which may be a cause of an eddy loss and preventing an insulation destruction, so that it is possible to implement an electronic induction heater which does not have an error.
  • an electronic induction heater is implemented in such a manner that an enamel coated copper wire is twisted on an upper portion of a substrate in multiple layers for thereby forming one winding conductor, and a radial shaped steel wire is installed in a bottom portion of a substrate.
  • an electronic induction heater which includes a plate shaped plate installed in an upper portion of a substrate of a heater, a plate shaped insulator installed between the plate shaped conductors, a fixing conductor layer fixed in such a manner that the plate shaped insulator and the plate shaped insulator are integrally formed in multiple numbers and are impregnated in an insulation material such as a varnish or epoxy, and a twisting portion in which the fixing conductor layer is twisted in an intermediate portion of the winding to make the lengths of the inner side winding and the outer side winding same when a bundle conductor wound the fixing conductor layer is engaged on the substrate, and the plate shaped conductor is wound.
  • the length of the iron core is a length Lb obtained by adding the length La from an outer diameter portion of the bundle conductor to an inner diameter portion in a normal direction and the length L 2 that the iron core is extended from an inner diameter portion of the bundle conductor.
  • the length of the inner side end from the inner diameter portion to the center of the circle is smaller than the height l 2 of the bundle conductor.
  • the lengths of the inner circle side winding and the outer circle side winding are made same when the plate shaped conductor is wound in a circle shape in the bundle conductor.
  • a twisting portion is formed in an intermediate portion of the winding in such a manner that the plate shaped conductor is twisted.
  • the fixing conductor layer is implemented in such a manner that the plate shaped conductor and the insulator are integrated and are bound in one bundle using a certain number of the same(preferably, 5) for thereby forming a conductor.
  • the bundle conductor represents a heating member formed by winding the fixing conductor layer. Namely, as shown in Figure 5, the bundle conductor represents a circular heating member in which the fixing conductor layer is wound on the substrate.
  • the plate shaped conductor may be enamel- coated for insulating the portions between the plate shaped conductors or the insulator maybe inserted.
  • an insulation paper called as NOMAX(brand name) is used as the insulator .
  • a circular iron core or a protrusion type circular iron core is preferably used for extending the magnetic path.
  • the twisting portion is implemented by riveting the plate shaped conductor using rivets at a certain length interval for decreasing the loss of the circulation current in maximum which may be a cause of eddy loss and insulation destroy.
  • Figure 1 is a view for describing a principle with respect to an induction heater
  • Figure 2 is a view illustrating the construction of a control circuit of an electronic induction heater
  • Figure 3 is a perspective view illustrating a conventional electronic induction heater
  • Figure 4 is a view illustrating a bottom portion of a heater of Figure 3;
  • Figure 5 is a plane view illustrating a major portion of the present invention.
  • Figure 6 is a cross sectional view of Figure 5;
  • Figure 7 is a view illustrating the construction of a bundle conductor according to the present invention
  • Figure 8 is a view illustrating a twist system of a plate shaped conductor according to the present invention
  • Figure 9 is a view illustrating the construction that a plate shaped conductor is riveted according to the present invention.
  • Figure 10A is a bottom view illustrating an iron core according to the present invention.
  • Figure 10B is a cross sectional view illustrating an iron core according to the present invention.
  • Figure 11 A is a bottom view illustrating a circular iron core according to another embodiment of the present invention
  • Figure 11 B is a cross sectional view illustrating a circular iron core according to another embodiment of the present invention
  • Figure 12A is a cross sectional view illustrating a circular iron core having a protrusion structure according to another embodiment of a circular iron core according to the present invention
  • Figure 12B is a perspective view illustrating the construction that a circular iron core of Figure 12A is engaged to a heater according to the present invention
  • Figure 13A is a cross sectional view illustrating a circular core according to another embodiment of the present invention
  • Figure 13B is a perspective view illustrating the construction that a circular core of Figure 13A is engaged to a heater according to the present invention
  • Figure 14A is a cross sectional view illustrating a circular core according to another embodiment of the present invention.
  • Figure 14B is a perspective view illustrating the construction that a circular core of Figure 14A is engaged to a heater according to the present invention.
  • Figure 5 is a plane view illustrating a major portion of the present invention
  • Figure 6 is a cross sectional view of Figure 5
  • Figure 7 is a view illustrating the construction of a bundle conductor according to the present invention.
  • a surface of a plate shaped conductor is coated with an enamel coating layer 48 based on a copper plate of a thickness 0.3mm and a height 5-1 Omm or a plane type insulation material 44 is inserted between the plate shaped conductors 41 as an insulation material.
  • a bundle conductor 40 formed by winding a fixing conductor layer 49 in a circular shape in which a multiple number of plate shaped conductors 41 is bound is engaged to an upper portion of the substrate 42.
  • reference numeral 38 represents a construction that the fixing conductor layer 49 is connected with an electric circuit. The above construction may be easily understood by the constructions of both ends of the heating coil 13 provided in a lower portion of the cooking container 20.
  • Ki and K 2 are constant.
  • Equation 2 in order to decrease the magnetic flux density Bm, it is needed to increase the frequency or to increase the homocentric cross section area A of the center of the bundle conductor.
  • Figure 8 is a view illustrating the construction that the plate shaped conductor of the present invention is twisted
  • Figure 9 is a view illustrating the construction which is riveted by the plate shaped conductor rivet of the present invention.
  • the intermediate portion of the bundle conductor 40 is twisted in such a manner that the inner and outer sides of the bundle conductor 40 are substituted for thereby forming the twisted portion 47. Therefore, the lengths of the inner and outer sides of the plate shaped conductor 42 are same, so that a circulation current does not occur.
  • the bundle conductor in another embodiment of the present invention, the bundle conductor
  • the loss power P occurs in proportion to the square of the circulation current I.
  • the loss power P occurs as a heat loss.
  • Figures 10A and 10B are views illustrating the iron core of the present invention, and Figure 10A is a bottom view, and Figure 10B is a perspective view illustrating that a steel wire is engaged to a heater.
  • an iron core 46 of a ferrite core is attached to a lower portion of the substrate 42 in a radial shape.
  • the length of the iron core of the present invention is directed to preventing the magnetic flux from being offset with the bundle conductor 40.
  • the height of the plate shaped conductor 41 is smaller than the extended length l 2 or equal thereto to or is larger than 0, namely, 0 ⁇ ⁇ l 2 .
  • Figures 11A and 11 B are views illustrating the arrangements of the circular iron core 52 according to another embodiment of the present invention.
  • Figure 11A is a bottom view
  • Figure 11 B is a perspective view illustrating the construction that a circular iron core is engaged to the heater according to the present invention.
  • the circular iron core 52 is adapted for the reason that the inner diameter may be decreased compared to the homocentric portion when the homocentric cross sectional area of the inner side circular of the winding is exchanged with the cross sectional area of the iron core.
  • the shape In order to insert into the center portion of the inner side circular of the winding, the shape must be same as the shape of the inner side circular of the winding.
  • Figures 12A and 12B are views illustrating the circular iron core according to another embodiment of the present invention.
  • Figure 12A is a cross sectional view illustrating a circular iron core 54 having a protrusion structure
  • Figure 12B is a perspective view illustrating the construction that the circular iron core 54 of the protrusion structure is engaged to the heater.
  • Figures 13A and 13B are views illustrating a circular iron core according to another embodiment of the present invention.
  • Figure 13A is a cross sectional view
  • Figure 13B is a perspective view illustrating the construction that a circular iron core is engaged to the heater according to the present invention.
  • the above iron core is implemented by integrally attaching a plate shaped iron core to the lower portion of the circular iron core.
  • Figures 14A and 14B are views illustrating a circular iron core according to another embodiment of the present invention.
  • Figure 14A is a cross sectional view illustrating the construction that a circular iron core is arranged for extending the magnetic path without arranging the circular iron core in a radial direction
  • Figure 14B is a perspective view illustrating that the circular iron core is engaged to the heater.
  • the length of the iron core is Lc.
  • the 16 conductor based on the Flemings left hand rule.
  • the conductor is vibrated by the above force.
  • an insulation material provided between the conductors becomes fatigue, and the above fatigue phenomenon of the insulation material may cause an insulation destroy. Therefore, in the present invention for implementing a dual effect for a fixing method capable of preventing the vibrations of the conductor and an enhancement of the insulation, the bundle conductor is impregnated with varnish or epoxy, so that the conductor is mechanically fixed, and the insulation is improved.
  • the present invention is basically directed to forming a bundle conductor using multiple pieces of a plate shaped conductor which does not have a circular cross section, and an intermediate insulation material is inserted into between the bundle conductors. An intermediate portion of each conductor is twisted, and the conductor is riveted using rivets at its regular length for thereby twisting the intermediate portions of the conductor.
  • the plane type conductor is used instead of the Litz wire comparing to the conventional art, so that it is possible to generate a uniform electric potential difference, whereby it is possible to decrease the eddy loss and the loss of the circulation current which may be a cause of the insulation destroy.
  • the length of the inner side end of the iron core of the bottom portion of the substrate is extended within a length range below the height of the bundle conductor, so that it is possible to prevent a thermal loss which occurs when the magnetic flux is offset with the inner side end of the bindle conductor in such a manner that the magnetic flux passes through at a certain distance from the inner side surface of the bundle conductor when the magnetic flux moves upwardly.
  • the electronic induction heater is well adapted to an electric oven, electric cooking appliance or heating instrument when a minimum rating power is above 1.9kW.
  • the electronic induction heater according to the present invention may be well adapted as a heating source for a heating appliance which needs an accurate time and temperature control such as an electric water heating device, an electric boiler, an electric iron, a coffee port, a vapor heater, etc.
  • a gas is used as a heating source, there may be a problem in safety. Therefore, the present invention may be well adapted to all kinds of products which use the gas as a heating source.
  • the electronic induction heater according to the present invention is capable of saving an energy and is well adapted to play a role as a stable heat source.
  • the bundle conductor 40 since the bundle conductor 40 is used, so that the surface is uniform. A relative electric potential difference occurring between the conductors is uniform, so that a circulation current does not occur for thereby fully preventing a cause of a heating of a bundle conductor and easily extending a cross sectional area during a zone current.
  • an induction heating cooking apparatus which has a low error ratio, low fabrication cost, and accurate operation in such a manner that a stable magnetic field is formed in a heating apparatus during a heating operation of an electronic induction based on the above described multiple advantages.
  • the above description is one embodiment for implementing a hair cutting scissors according to the present invention.
  • the present invention is not limited to the above embodiment.
  • the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above- described examples are not limited by any of the details of the foregoing description, unless otherwise specified, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Induction Heating (AREA)

Abstract

L'invention concerne un chauffage électronique par induction comprenant une plaque plane installée dans une portion supérieure d'un substrat de chauffage, un isolant plan installé entre les conducteurs plans, une couche conductrice de fixation mise en oeuvre de telle manière que l'isolant plan et le conducteur plan soient formés intégrés un nombre multiple de fois et soient imprégnés d'un matériau isolant, notamment un vernis ou une résine époxy, et une portion de torsion dans laquelle la couche conductrice de fixation est torsadée dans une portion intermédiaire de l'enroulement afin de rendre égales les longueurs de l'enroulement latéral interne et de l'enroulement latéral externe lorsqu'un conducteur en faisceau enroulé à la couche conductrice de fixation est engagé sur le substrat et que le conducteur plan est enroulé. Dans cette invention, il est possible d'empêcher la destruction de l'isolation en raison d'un chauffage trop important, d'augmenter facilement la surface de section transversale dans une zone de courant et de réduire la perte de résistance afin d'améliorer l'efficacité. En particulier, il est possible de réduire la perte par courant parasite et d'empêcher une augmentation de température dans une extrémité interne du conducteur faisceau et la perte par auto-vibration, ce qui permet de disposer d'un chauffage électronique par induction sans défaut.
PCT/KR2003/001605 2002-08-09 2003-08-09 Chauffage electronique a induction Ceased WO2004016048A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003248499A AU2003248499A1 (en) 2002-08-09 2003-08-09 Electronic induction heater

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR20020046979 2002-08-09
KR10-2002-0046979 2002-08-09
KR10-2003-0055220 2003-08-09
KR10-2003-0055220A KR100468410B1 (ko) 2002-08-09 2003-08-09 전자유도 가열장치

Publications (1)

Publication Number Publication Date
WO2004016048A1 true WO2004016048A1 (fr) 2004-02-19

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2003/001605 Ceased WO2004016048A1 (fr) 2002-08-09 2003-08-09 Chauffage electronique a induction

Country Status (2)

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AU (1) AU2003248499A1 (fr)
WO (1) WO2004016048A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1571889A1 (fr) * 2004-03-03 2005-09-07 Electrolux Home Products Corporation N.V. Plaque de cuisson possédant un dispositif multi-fonctions sans contact.
FR2954662A1 (fr) * 2009-12-23 2011-06-24 Jaeger Foyer a induction autonome ameliore

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4969158A (en) * 1986-02-12 1990-11-06 Asea Brown Boveri Inductive heating unit
US5208433A (en) * 1990-06-15 1993-05-04 Rotelec S. A. Inductive heating coil
JPH11126679A (ja) * 1997-10-21 1999-05-11 Toshiba Corp 誘導加熱調理器

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4969158A (en) * 1986-02-12 1990-11-06 Asea Brown Boveri Inductive heating unit
US5208433A (en) * 1990-06-15 1993-05-04 Rotelec S. A. Inductive heating coil
JPH11126679A (ja) * 1997-10-21 1999-05-11 Toshiba Corp 誘導加熱調理器

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1571889A1 (fr) * 2004-03-03 2005-09-07 Electrolux Home Products Corporation N.V. Plaque de cuisson possédant un dispositif multi-fonctions sans contact.
FR2954662A1 (fr) * 2009-12-23 2011-06-24 Jaeger Foyer a induction autonome ameliore

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