WO2008072804A1 - Bobinage de chauffage pour dispositif de cuisson par induction - Google Patents

Bobinage de chauffage pour dispositif de cuisson par induction Download PDF

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Publication number
WO2008072804A1
WO2008072804A1 PCT/KR2006/005456 KR2006005456W WO2008072804A1 WO 2008072804 A1 WO2008072804 A1 WO 2008072804A1 KR 2006005456 W KR2006005456 W KR 2006005456W WO 2008072804 A1 WO2008072804 A1 WO 2008072804A1
Authority
WO
WIPO (PCT)
Prior art keywords
heating coil
coil
thin copper
supporting plate
copper lines
Prior art date
Application number
PCT/KR2006/005456
Other languages
English (en)
Inventor
Yong Jai Kwon
Original Assignee
Yong Jai Kwon
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 Yong Jai Kwon filed Critical Yong Jai Kwon
Priority to PCT/KR2006/005456 priority Critical patent/WO2008072804A1/fr
Publication of WO2008072804A1 publication Critical patent/WO2008072804A1/fr

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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
    • H05B6/36—Coil arrangements
    • H05B6/362—Coil arrangements with flat coil conductors
    • 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
    • H05B6/36—Coil arrangements

Definitions

  • the present invention relates to a heating coil for an induction heating cooker, and more particularly, to a heating coil for an induction heating cooker that is braided to form a hatch-pattern tube so that the surface area thereof is increased (the heating coil has a small thickness and large height) and is wound in a spiral shape on a coil supporting plate so that bundles of the heating coil have a predetermined pitch and are spaced from each other by a predetermined interval pitch in a radial direction of a coil supporting plate, to improve cooling efficiency and uniformly form magnetic fields.
  • an induction heating cooker is a cooker that maximizes energy efficiency by using skin effect.
  • the induction heating cooker includes a heating coil 5 that forms magnetic fields in a vertical direction by using an inverter method so as to correspond to current flow, a cooking vessel 1 that converts eddy current flowing in a direction perpendicular to the magnetic fields into joule heat by using the characteristics of materials such as resistivity and magnetic permeability so as to cook food therein, and a ceramic plate 3 on which the cooking vessel 1 is placed.
  • a circuit for controlling the induction heating cooker includes a key input unit 35 used to select cooking functions by a user, a microcomputer 29 for controlling all of the components on the basis of functional data selected in the key input unit 35, a filter unit 11 for removing noises, such as EMI or EMC, from AC power to be input, a first rectifying unit 13 for rectifying the AC power from which noises are removed, a heating coil 5 for enabling the voltage output from the first rectifying unit 13 to resonate and inducing eddy current in the cooking vessel 1 by using an electric induction effect that occurs due to magnetic fields caused by the resonant voltage so that food in the cooking vessel 1 is heated up to a desired temperature, a switching unit 15 that is controlled by a drive control unit 31 and is switched to supply the resonant voltage to the heating coil 5, a drive control unit 31 that controls switching elements of the switching unit 15 and drives a cooling fan 33 for cooling the heated heating coil 5, a current detecting unit 19 for detecting current from the input AC power, a constant current detecting unit 27 for
  • a general cooking function of an electric induction cooker will be described as an example.
  • AC power is rectified into a ripple DC voltage by the first rectifying unit 13 and smoothed.
  • the AC power is lowered by the low voltage converter 17, is converted into a DC voltage by the second rectifying unit 21, and is supplied to the voltage regulator 23.
  • the voltage regulator 23 applies a constant voltage, which corresponds to an input DC voltage, to the microcomputer 29.
  • the constant voltage applied to the microcomputer 29 is used as a driving voltage of the microcomputer 29.
  • a user selects a button through the key input unit 35.
  • the microcomputer 29 displays a corresponding function on the display unit 37.
  • base current of the switching unit 15 is driven so as to correspond to pulse width modulation control signals generated from the drive control unit 31. For this reason, a resonant capacitor of the heating coil 5 and a resonant capacitor of the switching unit 15 are in a continuously resonant state due to DC current. Accordingly, large resonant current flows in the heating coil 5.
  • the combination structure between the heating coil 5 and the coil supporting plate 7 and the cross-sectional area of the heating coil 5 act as important factors in the above-mentioned induction heating cooker, in order to improve the cooling of the heating coil 5 and thermal efficiency on the basis of change in magnetic flux density and to prevent damage to the insulation.
  • FIG. 2 is a plan view showing that a heating coil 5 and a coil supporting plate 7 in the related art are combined with each other.
  • the heating coil 5 is composed of a plurality of thin copper lines 5a that is coated with an insulating layer such as enamel varnish and is twisted to have a litz-shape.
  • the twisted thin copper lines 5a are then coated with self-bonding varnish to form the heating coil 5.
  • the heating coil 5 having the litz-shape is wound in a spiral shape on the upper surface of a coil supporting plate 7 to which a plurality of ferrite cores (not shown) is attached. After that, the heating coil 5 is heated so that the self -bonding varnish is hardened. As a result, the heating coil 5 and the coil supporting plate 7 are integrally fixed to each other. Disclosure of Invention Technical Problem
  • a plurality of thin copper lines 5a having a cross-sectional area of 0.2 mm is twisted in a litz-shape to form the shape of a cylinder. For this reason, when the heating coil 5 is cooled by the cooling fan 33, the outer portion of the heating coil 5 comes in contact with air so as to be cooled. However, since air does not reach the thin copper lines 5 a disposed at the central portion of the heating coil, the thin copper lines 5a disposed at the central portion of the heating coil cannot be cooled. For this reason, cooling efficiency deteriorates. Accordingly, there have been problems that insulation is damaged due to high-frequency induction heat and the life span of products is shortened.
  • the heating coil 5 in the related art is wound in a spiral shape without intervals as shown in FIG. 4. For this reason, the intensity of the magnetic field is gradually increased at a position close to the center of the heating coil 5 as shown by a dotted line. As a result, the heating coil 5 at a position close to the center thereof is overheated, so that the insulation is damaged. In addition, since cooling air supplied from the lower side does not flow in an inner portion of the heating coil 5 and flows only around the heating coil 5, thermal efficiency and cooling efficiency significantly deteriorate. As a result, there have been problems that insulation is damaged and the life span of products is shortened. Technical Solution
  • the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a heating coil for an induction heating cooker that can uniformly maintain magnetic fields between a center of the heating coil and edges thereof; improve thermal efficiency and cooling efficiency; suppress the damage of insulation; and lengthen the life span of products.
  • a heating coil for an induction heating cooker is wound in a spiral shape on a coil supporting plate.
  • the heating coil includes a plurality of thin copper lines coated with an insulating layer.
  • the thin copper lines are braided to form a hatch-pattern tube.
  • the braided thin copper lines are pressed so as to have a small thickness and large height, and are then wound in a spiral shape on the upper surface of the coil supporting plate so that bundles of the braided thin copper lines have a predetermined pitch and are spaced from each other by a predetermined interval pitch in a radial direction of the coil supporting plate.
  • the interval pitch when the pitch of the bundles of the braided thin copper lines is in the range of 5 to 7 mm, the interval pitch may be in the range of 7 to 9 mm and the pitch of the bundles at the edge of the coil supporting plate 7 may be in the range of 8 to 15 mm.
  • a heating coil when wound in a spiral shape on a coil supporting plate, bundles of the heating coil have a predetermined pitch and are spaced from each other by an interval pitch in a radial direction of the coil supporting plate. Accordingly, magnetic fields are uniformly maintained between a center of the heating coil and edges thereof. As a result, it is possible to improve thermal efficiency and cooling efficiency. Further, it is possible to suppress damage to the insulation and to lengthen the life span of products.
  • FIG. 1 is a block diagram of an induction heating cooker in the related art.
  • FIG. 2 is a plan view illustrating that a heating coil and a coil supporting plate in the related art are combined with each other.
  • FIG. 3 is a view illustrating airflow on a cross-section of the heating coil in the related art.
  • FIG. 4 is a schematic view illustrating magnetic fields and airflow caused by the heating coil in the related art.
  • FIG. 5 is a plan view illustrating that a heating coil and a coil supporting plate according to the present invention are combined with each other.
  • FIG. 6 is a view illustrating airflow on a cross-section of the heating coil according to the present invention.
  • FIG. 7 is a schematic view illustrating magnetic fields and airflow caused by the heating coil according to the present invention.
  • a heating coil 50 of an induction heating cooker according to the present invention is composed of a plurality of thin copper lines 50a that are coated with an insulating layer such as enamel varnish and are braided to form a hatch-pattern tube.
  • the braided heating coil 50 is pressed to form a flat shape having a small thickness T and large height H so that the surface area of the heating coil is increased.
  • the braided heating coil 50 is wound in a spiral shape on the upper surface of a coil supporting plate 7 to which a plurality of ferrite cores (not shown) is attached.
  • the braided heating coil 50 is coated and combined on the coil supporting plate so that bundles of the braided heating coil 50 have a pitch Pl and are spaced from each other by an interval pitch P2 in a radial direction of the coil supporting plate.
  • the heating coil 50 When being wound in a spiral shape on the upper surface of the coil supporting plate 7, the heating coil 50 is temporarily and partially fixed by using silicon on the upper surface of the coil supporting plate 7. After that, when self-bonding varnish to be partially coated on the surface of the heating coil is heated, the heating coil 50 is hardened and thus integrally formed with the coil supporting plate 7.
  • the pitch Pl of the bundles of the heating coil 50 is in the range of 5 to 7 mm
  • the interval pitch P2 is in the range of 7 to 9 mm
  • the pitch Pl of the bundles at the edge of the coil supporting plate 7 is in the range of 8 to 15 mm.
  • a plurality of thin copper lines 50a having a cross-sectional area of 0.2 mm is braided to form a hatch-pattern tube and then pressed to form a flat shape having a small thickness T and large height H so that the surface area of the heating coil is increased.
  • the cooling air is supplied toward the heating coil 50 in a direction indicated by arrows, the cooling air comes in contact with the surface of the heating coil 50. As a result, the heating coil 50 is rapidly cooled.
  • the heating coil 50 has a braided shape that the plurality of thin copper lines
  • the heating coil 50a are all exposed to the outside when the heating coil 50 is pressed to form a flat shape having a small thickness T and large height H. For this reason, the heating coil 50 easily comes in contact with cooling air, so that cooling efficiency is improved. As a result, even if the heating coil 50 is turned on for a long time, it is possible to suppress damage to the insulation caused by high-frequency induction heat and to lengthen the life span of products.
  • the heating coil 50 according to the present invention when wound in a spiral shape as shown in FIG. 7, the bundles of heating coil 50 have a pitch Pl and are spaced from each other by an interval pitch P2 in a radial direction of the coil supporting plate. For this reason, magnetic fields are uniformly formed as shown by a dotted line. As a result, it is possible to obtain high thermal efficiency. Further, since cooling air flows in gaps of the heating coil 50 corresponding to the interval pitch P2, it is possible to rapidly cool the heating coil 50. As a result, it is possible to suppress damage to the insulation. [29] Meanwhile, the present invention is not limited to the above-mentioned embodiment, and may have various modifications without departing from the spirit and scope of the present invention. Further, it should be understood that various modifications are included in the following claims.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Induction Heating Cooking Devices (AREA)

Abstract

Le bobinage de chauffage selon l'invention comprend une pluralité de fils de cuivre fins gainés d'une couche isolante. Les fils de cuivre fins sont tressés pour former un tube présentant un motif hachuré. Les fils de cuivre fins tressés sont pressés de façon à présenter une faible épaisseur et une hauteur importante, puis enroulés en spirale sur la surface supérieure de la plaque de support du bobinage, de façon que les faisceaux de fils de cuivre fins tressés présentent une largeur P1 et sont espacés mutuellement par un intervalle P2 dans la direction radiale de la plaque de support de bobinage. Cette structure permet de maintenir des champs magnétiques uniformes entre le centre et les bords du bobinage de chauffage, ce qui permet d'améliorer le rendement thermique et le refroidissement. De plus, les dommages causés à l'isolation sont ainsi supprimés et la durée de vie des produits allongée.
PCT/KR2006/005456 2006-12-14 2006-12-14 Bobinage de chauffage pour dispositif de cuisson par induction WO2008072804A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/KR2006/005456 WO2008072804A1 (fr) 2006-12-14 2006-12-14 Bobinage de chauffage pour dispositif de cuisson par induction

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/KR2006/005456 WO2008072804A1 (fr) 2006-12-14 2006-12-14 Bobinage de chauffage pour dispositif de cuisson par induction

Publications (1)

Publication Number Publication Date
WO2008072804A1 true WO2008072804A1 (fr) 2008-06-19

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2312910A1 (fr) * 2009-10-13 2011-04-20 Samsung Electronics Co., Ltd. Dispositif de chauffage utilisable avec un appareil de cuisson, son procédé de fabrication et appareil de cuisson
CN109309976A (zh) * 2017-07-28 2019-02-05 佛山市顺德区美的电热电器制造有限公司 Lds线圈盘及具有该lds线圈盘的电磁烹饪器具
ES2703218A1 (es) * 2017-09-07 2019-03-07 Bsh Electrodomesticos Espana Sa Dispositivo de campo de cocción por inducción

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4453067A (en) * 1982-01-11 1984-06-05 Whirlpool Corporation Induction heating coil
KR0127476B1 (ko) * 1994-05-17 1998-04-02 이헌조 전자조리기의 유도가열코일의 가열을 증대시키는 구조 및 방법
JP2002208527A (ja) * 2001-01-12 2002-07-26 Toko Inc 漏れ磁束型電力変換トランス
KR100678383B1 (ko) * 2005-09-23 2007-02-02 권용재 유도가열조리기의 가열코일

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4453067A (en) * 1982-01-11 1984-06-05 Whirlpool Corporation Induction heating coil
KR0127476B1 (ko) * 1994-05-17 1998-04-02 이헌조 전자조리기의 유도가열코일의 가열을 증대시키는 구조 및 방법
JP2002208527A (ja) * 2001-01-12 2002-07-26 Toko Inc 漏れ磁束型電力変換トランス
KR100678383B1 (ko) * 2005-09-23 2007-02-02 권용재 유도가열조리기의 가열코일

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2312910A1 (fr) * 2009-10-13 2011-04-20 Samsung Electronics Co., Ltd. Dispositif de chauffage utilisable avec un appareil de cuisson, son procédé de fabrication et appareil de cuisson
CN102038435A (zh) * 2009-10-13 2011-05-04 三星电子株式会社 与烹饪用具一起使用的加热装置及其制造方法和烹饪用具
CN109309976A (zh) * 2017-07-28 2019-02-05 佛山市顺德区美的电热电器制造有限公司 Lds线圈盘及具有该lds线圈盘的电磁烹饪器具
ES2703218A1 (es) * 2017-09-07 2019-03-07 Bsh Electrodomesticos Espana Sa Dispositivo de campo de cocción por inducción

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