(19)
(11)EP 3 962 239 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
25.01.2023 Bulletin 2023/04

(21)Application number: 21187854.1

(22)Date of filing:  27.07.2021
(51)International Patent Classification (IPC): 
H05B 6/12(2006.01)
(52)Cooperative Patent Classification (CPC):
H05B 6/1263

(54)

AN INDUCTION HEATING COOKER WITH IMPROVED COOLING PERFORMANCE

INDUKTIONSHERD MIT VERBESSERTER KÜHLLEISTUNG

APPAREIL DE CUISSON À CHAUFFAGE PAR INDUCTION PRÉSENTANT UNE MEILLEURE PERFORMANCE DE REFROIDISSEMENT


(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(30)Priority: 31.08.2020 TR 202013716

(43)Date of publication of application:
02.03.2022 Bulletin 2022/09

(73)Proprietor: Arçelik Anonim Sirketi
34445 Istanbul (TR)

(72)Inventors:
  • ONAL, Mustafa
    34445 ISTANBUL (TR)
  • OFLUGIL, Ilhan
    34445 ISTANBUL (TR)
  • TAN, Oguz
    34950 ISTANBUL (TR)
  • BEYTER, Engin
    34445 Istanbul (TR)
  • KURT, Ahmet
    34445 ISTANBUL (TR)


(56)References cited: : 
EP-A2- 2 679 913
WO-A1-2013/064396
WO-A1-2011/154373
US-A1- 2012 152 933
  
      
    Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).


    Description


    [0001] The present invention relates to an induction heating cooker having improved air circulation and cooling performance.

    [0002] Today, induction heating cookers are household appliances which are operated by means of electromagnets generating magnetic fields for domestic or industrial purposes. As a basic working principle, said appliances turn into an open electric circuit when there is no metal pot thereon, and a completed electric circuit when there is. Thus, a magnetic field is generated and heating is provided with the energy transferred to the body of the metal pot. By means of the the energy transferred to the metal pot by changing the strength of the magnetic field generated, the amount of heat can also be adjusted.

    [0003] In the household induction heating cookers, the power switching which provides the adjustment of the power and staging of the cooker is performed by means of power transistors called IGBT. During the use of the induction heating cooker, the IGBT heats up due to the switching process during the adjustment of the desired level in the cooker, and the temperature thereof rises as the operating time increases. In order to prevent the IGBT from causing a heating-related safety problem during the operating time thereof, the cooker is automatically turned off upon reaching a certain temperature (usually 90°C), and further heating of the component is prevented. Moreover, various cooling systems are used to prevent the heating of the IGBT component. Thus, the performance of an induction heating cooker depends on the operating time of the cooker and it is accepted that the cooker performance increases as the operating time increases. It is possible to increase the operating time of the cooker by effectively cooling the power switching IGBTs. It is known that in the induction heating cookers where effective cooling cannot be provided, the components which get too hot turn off the cooker, preventing the foodstuffs from being cooked and reducing user satisfaction. Moreover, due to the heating of the circuit boards in the cooker, the lifetime of the cooker may be shortened due to overheating.

    [0004] In the state of the art European Patent Application No. EP2712267A1, an induction heating cooker is disclosed, wherein cooling is provided by ventilation by means of two symmetrical openings.

    [0005] The aim of the present invention is the realization of an induction heating cooker with improved performance by providing an efficient air cooling on the power switching components.

    [0006] The induction heating cooker realized in order to attain the aim of the present invention, explicated in the claims, comprises a body; at least one circuit board which is disposed in the body; at least one IGBT component which is disposed in the body and which provides power switching; at least one heat sink which contacts the IGBT component so as to cool the same; at least one fan which is disposed in the body and which provides the cooling of the circuit board and the IGBT component by air; and an air guiding member which is positioned in the flow of the air provided by the fan and which guides the air. By means of the heat sink which absorbs the excessive heat and the air flow provided by the fan towards the air guiding member, the IGBT component and the circuit boards can be operated within the ideal operating range for a longer period of time, providing a continuous cooker performance. The induction heating cooker further comprises an air guiding member having groove-shaped air ducts, which is placed on the heat sink and the IGBT component so as to allow the cooling air from the fan to be distributed more evenly to the IGBT components. It is aimed that the air molecules pass through the heat sink surface by means of the air ducts in accordance with the flow direction of the air coming out of the fan so as to be guided onto the IGBT components. Moreover, the induction heating cooker comprises at least one first slit which is provided between the air guiding member and the air outlet of the fan so as to guide the air to the circuit boards on the right and left sides of the body, and at least one second slit which is provided on the body and which enables the air passing over the circuit boards to continue to circulate. There may be preferably two first slits and two second slits on the parts of the air guiding member facing the circuit boards. Thus, the air coming out of the fan is guided first to the IGBT components and then to the circuit boards so as to exit through the second slit, ensuring a much more efficient air circulation.

    [0007] In an embodiment of the present invention, the induction heating cooker comprises a guide which is positioned at the outlet of the first slit so as to guide the air leaving the first slit directly onto the circuit board. Thus, the air, which is disorderly guided to the circuit boards, passes through the guide more smoothly and spreads over the boards, increasing the cooling efficiency.

    [0008] In an embodiment of the present invention, the induction heating cooker comprises the air guiding member of which the air ducts are symmetrically distributed in the horizontal and vertical axes. In order to evenly distribute the air to the IGBT components and the circuit boards positioned at both sides, the air ducts are enabled to be arranged symmetrically in the horizontal and vertical axes. Thus, the efficiency of the cooling performance of the induction heating cooker is increased.

    [0009] In an embodiment of the present invention, the induction heating cooker comprises the air guiding member manufactured from a metal material. By means of a metal air guiding member, the durability thereof is increased and a better cooling is obtianed by means of the heat conductivity.

    [0010] In an embodiment of the present invention, the induction heating cooker comprises the air guiding member manufactured from a plastic material. Thus, a cost-efficient and lightweight design is obtained, providing ease of production.

    [0011] By means of the induction heating cooker of the present invention, the components which heat up are cooled such that a more smooth cooking performance is provided.

    [0012] An induction heating cooker realized in order to attain the aim of the present invention is illustrated in the attached figures, where:

    Figure 1 - is the perspective view of the induction heating cooker.

    Figure 2 - is the schematic view of the air guiding member together with the induction heating cooker.

    Figure 3 - is another schematic view of the air guiding member together with the induction heating cooker.



    [0013] The elements illustrated in the figures are numbered as follows:
    1. 1. Induction heating cooker
    2. 2. Body
    3. 3. IGBT component
    4. 4. Heat sink
    5. 5. Fan
    6. 6. Circuit board
    7. 7. Air guiding member
    8. 8. Air duct
    9. 9. First slit
    10. 10. Second slit
    11. 11. Guide


    [0014] The induction heating cooker (1) comprises a body (2); at least one circuit board (6) which is disposed in the body (2); at least one IGBT component (3) which is disposed in the body (2) and which provides power switching; at least one heat sink (4) which contacts the IGBT component (3) so as to cool the same; at least one fan (5) which is disposed in the body (2) and which provides the cooling of the circuit board (6) and the IGBT component (3) by air; and an air guiding member (7) which is positioned in the flow of the air provided by the fan (5) and which guides the air. By means of the heat sink (4) which absorbs the excessive heat and the air flow provided by the fan (5) towards the air guiding member (7), the IGBT component (3) and the circuit boards (6) can be operated within the ideal operating range for a longer period of time, providing a continuous cooking performance. The induction heating cooker (1) further comprises an air guiding member (7) having groove-shaped air ducts (8), which is placed on the heat sink (4) and the IGBT component (3) so as to allow the cooling air from the fan (5) to be distributed more evenly to the IGBT components (3). It is aimed that the air molecules pass through the heat sink (4) surface by means of the air ducts (8) in accordance with the flow direction of the air coming out of the fan (5) so as to be guided onto the IGBT components (3). Especially by leaving a certain distance between the heat sink (4) and the air guiding member (7) by the producer, an air path is created. Moreover, the induction heating cooker (1) comprises at least one first slit (9) which is provided between the air guiding member (7) and the air outlet of the fan (5) so as to guide the air to the circuit boards (6) on the right and left sides of the body (2), and at least one second slit (10) which is provided on the body (2) and which enables the air passing over the circuit boards (6) to continue to circulate. For example, there may be two first slits (9) and two second slits (10) on the parts of the air guiding member (7) facing the circuit boards (6), and thus two equal air paths can be created at both sides of the body (2). Thus, the air coming out of the fan (5) is guided first to the IGBT components (3) and then to the circuit boards (6) so as to exit through the second slit (10), ensuring a much more efficient air circulation.

    [0015] In an embodiment of the present invention, the induction heating cooker (1) comprises a guide (11) which is positioned at the outlet of the first slit (9) so as to guide the air leaving the first slit (9) directly onto the circuit board (6). Thus, the air, which is disorderly guided to the circuit boards (6), passes through the guide (11) more smoothly and spreads over the circuits boards (6), increasing the cooling efficiency. By better cooling the circuit boards (6), the performance of the induction heating cooker (1) is also indirectly improved.

    [0016] In an embodiment of the present invention, the induction heating cooker (1) comprises the air guiding member (7) of which the air ducts (8) are symmetrically distributed in the horizontal and vertical axes. In order to evenly distribute the air to the IGBT components (3) and the circuit boards (6) positioned at both sides, the air ducts (8) are enabled to be arranged symmetrically in the horizontal and vertical axes. Thus, identical operation conditions are provided for the IGBT components (3) provided at the right and left sides. Thus, the efficiency of the cooling performance of the induction heating cooker (1) is improved, preventing the same from reaching critical temperatures and being turned off.

    [0017] In an embodiment of the present invention, the induction heating cooker (1) comprises the air guiding member (7) manufactured from a metal material. By means of a metal air guiding member (7) preferably manufactured from stainless steel, the durability thereof is increased and a better cooling is obtained by means of the heat conductivity.

    [0018] In an embodiment of the present invention, the induction heating cooker (1) comprises the air guiding member (7) manufactured from a plastic material. Thus, a cost-efficient and lightweight design is obtained, providing ease of production.

    [0019] By means of the induction heating cooker (1) of the present invention, the power switching components are cooled more efficiently by air, providing an improved cooking performance.


    Claims

    1. An induction heating cooker (1) comprising a body (2); at least one circuit board (6) which is disposed in the body (2); at least one IGBT component (3) which is disposed in the body (2) and which provides power switching; at least one heat sink (4) which contacts the IGBT component (3) so as to cool the same; at least one fan (5) which is disposed in the body (2) and which provides the cooling of the circuit board (6) and the IGBT component (3) by air; and an air guiding member (7) which is positioned in the flow of the air provided by the fan (5) and which guides the air, characterized by

    - an air guiding member (7) having groove-shaped air ducts (8), which is placed on the heat sink (4) and the IGBT component (3) so as to allow the cooling air from the fan (5) to be distributed more evenly to the IGBT components (3), and

    - at least one first slit (9) which is provided between the air guiding member (7) and the air outlet of the fan (5) so as to guide the air to the circuit boards (6) on the right and left sides of the body (2), and at least one second slit (10) which is provided on the body (2) and which enables the air passing over the circuit boards (6) to continue to circulate.


     
    2. An induction heating cooker (1) as in Claim 1, characterized by a guide (11) which is positioned at the outlet of the first slit (9) so as to guide the air leaving the first slit (9) directly onto the circuit board (6).
     
    3. An induction heating cooker (1) as in Claim 1 or 2, characterized by the air guiding member (7) of which the air ducts (8) are symmetrically distributed in the horizontal and vertical axes.
     
    4. An induction heating cooker (1) as in any one of the above claims, characterized by the air guiding member (7) which is manufactured from a metal material.
     
    5. An induction heating cooker (1) as in any of claims 1 to 3, characterized by the air guiding member (7) which is manufactured from a plastic material.
     


    Ansprüche

    1. Ein Induktionsherd (1) umfasst einen Körper (2); mindestens eine Leiterplatte (6), die im Körper (2) angeordnet ist; mindestens eine IGBT-Komponente (3), die in dem Körper (2) angeordnet ist und die Leistungsschaltung bereitstellt; mindestens einen Kühlkörper (4), der die IGBT-Komponente (3) kontaktiert, um dieselbe zu kühlen; mindestens einen Lüfter (5), der in dem Körper (2) angeordnet ist und der für die Kühlung der Leiterplatte (6) und der IGBT-Komponente (3) durch Luft sorgt; und ein Luftführungselement (7), das in der Luftströmung angeordnet ist, die von dem Lüfter (5) bereitgestellt wird, und das die Luft führt, gekennzeichnet ist er durch

    - ein Luftführungselement (7) mit nutförmigen Luftkanälen (8), das auf dem Kühlkörper (4) und dem IGBT- Komponenten (3) platziert ist, um zu ermöglichen, dass die Kühlluft von dem Lüfter (5) gleichmäßiger zu den IGBT-Komponenten (3) verteilt wird, und

    - mindestens einen ersten Schlitz (9), der zwischen dem Luftleitelement (7) und dem Luftauslass des Lüfters (5) vorgesehen ist um die Luft zu den Leiterplatten (6) auf der rechten und linken Seite des Körpers (2) zu führen, und mindestens einen zweiten Schlitz (10), der an dem Körper (2) vorgesehen ist und der den Luftdurchtritt ermöglicht über die Leiterplatte (6) weiter umzulaufen.


     
    2. Ein Induktionsherd (1), wie in Anspruch 1 aufgeführt, ist dadurch gekennzeichnet, dass eine Führung (11), die am Ausgang des ersten Schlitzes (9) positioniert ist, um die den ersten Schlitz (9) verlassende Luft direkt auf die Leiterplatte (6) zu leiten.
     
    3. Ein Induktionsherd (1), wie in Anspruch 1 oder 2 aufgeführt, ist dadurch gekennzeichnet, dass das Luftführungselement (7) Luftkanäle (8) aufweist, die symmetrisch in der horizontalen und der vertikalen Achse verteilt sind.
     
    4. Ein Induktionsherd (1), wie in einem der vorherigen Ansprüchen aufgeführt, ist dadurch gekennzeichnet, dass das Luftführungselement (7) aus einem Metallmaterial hergestellt ist.
     
    5. Ein Induktionsherd (1), wie in den Ansprüchen 1 bis 3 aufgeführt, ist dadurch gekennzeichnet, dass das Luftführungselement (7) aus einem Kunststoffmaterial hergestellt ist.
     


    Revendications

    1. Un appareil de chauffage par induction (1) comprenant un corps (2) ; au moins une carte de circuit imprimé (6) qui est disposée dans le corps (2) ; au moins un composant IGBT (3) qui est disposé dans le corps (2) et qui assure la commutation de puissance ; au moins un dissipateur thermique (4) qui est en contact avec le composant IGBT (3) de manière à le refroidir ; au moins un ventilateur (5) qui est disposé dans le corps (2) et qui assure le refroidissement de la carte de circuit imprimé (6) et du composant IGBT (3) par l'air ; et un élément de guidage d'air (7) qui est positionné dans le flux d'air fourni par le ventilateur (5) et qui guide l'air, caractérisé par

    - un élément de guidage d'air (7) ayant des conduits d'air en forme de rainure (8), qui est placé sur le dissipateur thermique (4) et le composant IGBT (3) de façon à permettre à l'air de refroidissement provenant du ventilateur (5) d'être distribué plus uniformément aux composants IGBT (3), et

    - au moins une première fente (9) qui est prévue entre l'organe de guidage d'air (7) et la sortie d'air du ventilateur (5) de manière à guider l'air vers les cartes de circuits imprimés (6) sur les côtés droit et gauche du corps (2), et au moins une deuxième fente (10) qui est prévue sur le corps (2) et qui permet à l'air passant sur les cartes de circuits imprimés (6) de continuer à circuler.


     
    2. Un appareil de chauffage par induction (1) selon la déclaration 1, caractérisé par un guide (11) qui est positionné à la sortie de la première fente (9) de manière à guider l'air quittant la première fente (9) directement sur la carte de circuit imprimé (6).
     
    3. Un appareil de chauffage par induction (1) comme dans la déclaration 1 ou 2, caractérisé par l'élément de guidage d'air (7) dont les conduits d'air (8) sont répartis symétriquement dans les axes horizontal et vertical.
     
    4. Appareil de chauffage par induction (1) comme dans l'une quelconque des déclarations ci-dessus, caractérisé par l'élément de guidage d'air (7) qui est fabriqué à partir d'un matériau métallique.
     
    5. Un appareil de chauffage par induction (1) comme dans l'une quelconque des déclarations 1 à 3, caractérisé par l'élément de guidage d'air (7) qui est fabriqué à partir d'une matière plastique.
     




    Drawing














    Cited references

    REFERENCES CITED IN THE DESCRIPTION



    This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.

    Patent documents cited in the description