EP3461229B1 - Table de cuisson à induction - Google Patents
Table de cuisson à induction Download PDFInfo
- Publication number
- EP3461229B1 EP3461229B1 EP17192537.3A EP17192537A EP3461229B1 EP 3461229 B1 EP3461229 B1 EP 3461229B1 EP 17192537 A EP17192537 A EP 17192537A EP 3461229 B1 EP3461229 B1 EP 3461229B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cooking hob
- induction cooking
- switching element
- induction
- temperature
- 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.)
- Active
Links
- 230000006698 induction Effects 0.000 title claims description 54
- 238000010411 cooking Methods 0.000 title claims description 36
- 238000001816 cooling Methods 0.000 claims description 27
- 238000010438 heat treatment Methods 0.000 claims description 19
- 239000004065 semiconductor Substances 0.000 claims description 6
- 239000003990 capacitor Substances 0.000 claims description 5
- 238000013021 overheating Methods 0.000 description 4
- 230000033228 biological regulation Effects 0.000 description 3
- ALDJIKXAHSDLLB-UHFFFAOYSA-N 1,2-dichloro-3-(2,5-dichlorophenyl)benzene Chemical compound ClC1=CC=C(Cl)C(C=2C(=C(Cl)C=CC=2)Cl)=C1 ALDJIKXAHSDLLB-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000011889 copper foil Substances 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- CUGLICQCTXWQNF-UHFFFAOYSA-N 1,2-dichloro-3-(2,6-dichlorophenyl)benzene Chemical compound ClC1=CC=CC(C=2C(=CC=CC=2Cl)Cl)=C1Cl CUGLICQCTXWQNF-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Images
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
- H05B6/06—Control, e.g. of temperature, of power
- H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
-
- 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
- H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
- H05B2213/07—Heating plates with temperature control means
Definitions
- the present invention relates to an induction cooking hob comprising a plurality of heating units and a plurality of switching elements.
- Document JP 2011/198621 A1 describes an electromagnetic cooker capable of effectively cooling a semiconductor switching element mounted on radiators by forming an air channel hardly leaking cooling wind from a cooling fan with the use of a pair of the radiators having a simple structure.
- the electromagnetic cooker is provided with a heating coil, an inverter circuit containing a plurality of switching elements supplying high-frequency current to the heating coil, at least a pair of radiators mounted on each of the switching elements and containing a plurality of heat radiating fins, and a cooling fan blasting air to the air channel formed between the pair of radiators by arranging at least one heat radiating fin of one of the radiators between heat radiating fins of the other radiator.
- Document EP 1 679 938 A1 describes an induction heating cooking device having an inverter including a resonant circuit, and a heating output control part.
- the resonant circuit has a resonant capacitor and a heating coil that is magnetically coupled to a load.
- the inverter has first and second switching elements.
- the heating output control part performs control by inverting the rate values of the driving periods of the first and second switching elements. The driving of the inverter is thus controlled so that substantially the same heating output is obtained to average the losses of the first and second switching elements.
- Document EP 2 746 672 A1 describes a cooktop with a control device for controlling inductors.
- the control device includes a single temperature sensor arranged in a cooling air stream generated by a fan, and arranged downstream of an end of a heat sink.
- a microcontroller is arranged in the cooling air stream generated by the fan, and arranged downstream of the end of the heat sink, where power supply to power components of the control device is limited by the microcontroller according to the value of temperature measured by the temperature sensor.
- Document JP 2001 267056 A relates to an induction heating cooker having a frequency converter for turning on/off a switching semiconductor and supplying a high frequency current to a heating coil by resonance.
- a thermistor is connected to a copper foil of a printed circuit board in the vicinity of a solder connecting portion of an emitter terminal of a reverse conducting transistor by soldering the end portion to the copper foil.
- a collector and emitter terminal of the transistor, terminals of the reverse conducting transistor, and terminals of the thermistor are soldered.
- Document EP 1 616 463 B1 is related to a high-frequency dielectric heating by using a magnetron, and to protecting a semiconductor switching element such as IGBT (insulated gate bipolar transistor) used in an inverter from being overheated.
- IGBT insulated gate bipolar transistor
- a heat-radiating portion of the IGBT that generates a high temperature is secured to heat-radiating fins, and three legs thereof are inserted in through holes in a printed circuit board and are soldered on the opposite side.
- a chip thermistor is directly soldered to a leg of the IGBT on a soldering surface on the back side of the printed circuit substrate.
- Document EP 1 571 707 A2 is related to temperature detection for a semiconductor device used for a power conversion apparatus to drive an alternating current induction motor.
- a problem with known cooking hobs is the fact that it is difficult to set the appropriate power for each heating unit so as to avoid any overheating of the switching elements which can lead to a malfunction or can destroy parts of the induction cooking hob and the comprised circuits or electrical components such as the switching elements itself.
- the induction cooking hob according to the present invention includes a plurality of temperature sensors, wherein each of the temperature sensors is associated and thermally connected to one of the switching elements, wherein the temperature sensors are adapted to sense the temperature of the dedicated switching element.
- each switching element is associated with a (separate) respective temperature sensor being thermally connected to the switching element, wherein the temperature sensor is adapted to sense the temperature of the switching element, a more precise temperature estimation and control of the switching element can be achieved. As a result the power fed into or through the switching elements can be better controlled and an overheating of the components of the induction cooking hob, especially of the related switching element, can be avoided.
- the induction cooking hob comprises induction coils, each induction coil being associated to one of the heating units, wherein a power generator is associated to each of the induction coils for feeding electrical power to the induction coil.
- the temperature sensors preferably are thermistors.
- the switching element is a semiconductor switching element, preferably an insulated-gate bipolar transistor (IGBT), or a relay.
- IGBT insulated-gate bipolar transistor
- the induction cooking hob comprises a resonant circuit, wherein the induction coil is part of the resonant circuit, and the resonant circuit further comprises a capacitor.
- the power generator comprises an inverter adapted to convert a direct current (DC) voltage into an alternating current (AC) voltage to be applied to the induction coil.
- DC direct current
- AC alternating current
- the inverter or each inverter comprises one or two switching elements, each of them being thermally connected to an associated temperature sensor which is adapted to sense the temperature of the associated switching element.
- the switching elements and the associated temperature sensors can be mounted onto a printed circuit board (PCB) and preferably are surface mounted devices (SMD). This i.a. reduces production cost.
- PCB printed circuit board
- SMD surface mounted devices
- At least one cooling body can be mounted onto such a PCB and is thermally connected to at least one switching element. This leads to the benefit that the cooling body acts as a heating sink or passive heat exchanger that transfers the heat generated by the switching element to the surrounding air, thereby allowing regulation of the device's temperature at optimal levels.
- a temperature sensor and at least one leg of the switching element are sharing the same PCB pattern.
- the temperature sensor and the switching element can be mounted on opposite sides of the PCB.
- an induction cooking hob preferably comprises: at least one, preferably one or two power boards, each power board comprising: at least one, preferably one or two power generators, each power generator being associated to one induction coil and comprising: at least one, preferably one or two switching elements, each switching element being thermally connected to an associated temperature sensor, wherein the temperature sensor is adapted to sense the temperature of the respective switching element.
- the induction cooking hob includes one-to-one association between every switching element (preferably IGBTs) and one of the temperature sensors (preferably thermistors) leading to an improved power and temperature management of the switching elements.
- every switching element preferably IGBTs
- one of the temperature sensors preferably thermistors
- a further temperature sensor is provided and placed in or nearby an air inlet or outlet of a cooling fan and adapted to measure the temperature of cooling air draw in or ejected by the fan. This leads to the benefit that the cooling fan can cool the switching element and the efficiency of the cooling can be controlled by measuring the respective air temperature.
- the induction cooking hob further comprises a microcontroller being adapted to receive input signals from at least one temperature sensor and to control the electrical power that is delivered to a switching elements associated with the temperature sensor. This includes the benefit that a feedback control can be established wherein the electrical power that is directed towards the respective switching element or power generator / inverter can be controlled based on the detected temperature of the switching element.
- the induction cooking hob further comprises at least one cooling body and a temperature sensor is provided per switching element or per generator or per cooling body, wherein the cooling body and the temperature sensor an the switching element preferably are mounted on a PCB.
- F IG . 1 illustrates a schematic circuit diagram of the induction cooking hob according to the present invention.
- a thermistor circuit 10 is shown comprising a thermistor 12 connected to a potential V CC 14 and a common ground 42.
- the thermistor 12 is arranged at or nearby a joint of a switching element such as an insulated-gate bipolar transistor (IGBT) 26.
- IGBT 26 is part of a power generator 20 or inverter which feeds electrical power to a resonant circuit 32 comprising an induction coil 34 and a capacitor 36.
- Induction coil 34 is associated to a heating unit 50 which can be used to heat a load 38 such as a pan or a pot or the like.
- Power generator 20 can be realized by or comprise a half-bridge inverter 22 comprising an additional IGBT 24 and two diodes 28 and 30.
- the power generator 20 can also be realized by other means such as a quasi-resonant converter comprising only one switching element such as an IGBT.
- Half-bridge inverter 22 is connected to a potential V BUS 40 and also to common ground 42.
- the dotted line in F IG . 1 illustrates that thermistor circuit 10 with thermistor 12 and power generator 20 comprising or consisting of half-bridge inverter 22 (or another type of inverter) not only share the same common electrical ground 42, but IGBT 26 and thermistor 12 are arranged at a small distance or in contact with each other so that thermistor 12 is also thermally connected to IGBT 26. Therefore, thermistor 12 can be used for detecting the specific temperature of IGBT 26.
- Electrical connection 16 connects thermistor 12 to a microcontroller (not shown) which is used to control or feedback-control the electrical power provided to and fed into power generator 20. Due to the thermal connection of thermistor 12 to IGBT 26 a more precise temperature estimation of IGBT 26 is achieved. Therefore, power control and power delivery to the power generator 20 can be controlled in a more precise manner so as to avoid an overheating of IGBT 26 and/or other parts of the circuit. An improved power regulation and temperature control of the induction cooking hob is achieved.
- Thermistor 12 can be used to limit the maximum temperature of the components of the power generator20 by modulating the power by means of the controller, wherein the latter can be a microcontroller running a respective software or program.
- Fig. 2 shows schematic view onto thermistor 12 and IGBT 26 of Fig. 1 which both are mounted onto a printed circuit board (PCB) 44.
- PCB printed circuit board
- Thermistor 12 as well as IGBT 26 are SMDs (Surface Mounted Devices).
- thermistor 12 and IGBT 26 are mounted on opposite sides of PCB 44.
- Thermistor 12 and IGBT 26 are arranged close to each other or in contact with each other so that thermistor 12 is thermally connected to IGBT 26.
- One leg 46 of IGBT 26 and thermistor 12 share the same pattern potential of PCT 44 which means that they are not only in electrical contact (see common ground 42 according to Fig. 1 ) but also in thermal contact with each other through the metallization of the PCB.
- Fig. 2 also shows a heat radiating fin 48 of a cooling body which is thermally connected to IGBT 26 so as to act as a heat sink for IGBT 26.
- a cooling fan can be provided which sucks in air and directs a respective air flow towards the components of power generator 20 such as towards IGBTs 24 and 26 and fin 48.
- a further temperature sensor is provided and placed in or nearby an air inlet of such a cooling fan and is adapted to measure the temperature of cooling air drawn in or ejected by the fan.
- thermosensors or thermistors can be provided in contact to PCB 44 or to fin 48 of the cooling body and used for detecting the temperature of the PCB or the cooling body.
- a combination of all measurements of the comprised temperature sensors improves the overall power and temperature regulation.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Induction Heating Cooking Devices (AREA)
Claims (13)
- Table de cuisson à induction comprenant une pluralité d'unités de chauffage (50), une pluralité d'éléments de commutation, et une pluralité de capteurs de température, chacun des capteurs de température étant associé et thermiquement connecté à l'un des éléments de commutation,les capteurs de température étant conçus pour capter la température de l'élément de commutation dédié,un capteur de température de la pluralité de capteurs de température et au moins un segment de l'élément de commutation dédié partageant le même tracé de circuit imprimé, etun autre capteur de température étant prévu et placé dans ou à proximité d'une entrée ou d'une sortie d'air d'un ventilateur de refroidissement et conçu pour mesurer la température de l'air de refroidissement aspiré ou rejeté par le ventilateur.
- Table de cuisson à induction selon la revendication 1, la table de cuisson à induction comprenant des bobines d'induction (34), chaque bobine d'induction étant associée à l'une des unités de chauffage, et dans laquelle un générateur d'énergie électrique (20) est associé à chacune des bobines d'induction pour alimenter la bobine d'induction en énergie électrique.
- Table de cuisson à induction selon l'une quelconque des revendications précédentes, dans laquelle au moins l'un des capteurs de température est une thermistance (12).
- Table de cuisson à induction selon l'une quelconque des revendications précédentes, dans laquelle au moins l'un des éléments de commutation est un élément de commutation à semi-conducteur, préférablement un transistor bipolaire à grille isolée (IGBT) (24, 26), ou un relais.
- Table de cuisson à induction selon l'une quelconque des revendications précédentes 2 à 4, la table de cuisson à induction comprenant des circuits résonnants (32) dans laquelle chaque bobine d'induction (34) fait partie d'un circuit résonnant, chaque circuit résonnant comprenant en outre un condensateur (36).
- Table de cuisson à induction selon l'une quelconque des revendications précédentes 2 à 5, dans laquelle chaque générateur d'énergie électrique (20) comprend un onduleur (22) conçu pour convertir un courant continu (CC) en un courant alternatif (CA) à appliquer à la bobine d'induction (34).
- Table de cuisson à induction selon la revendication 6, dans laquelle l'onduleur (22) comprend un ou deux éléments de commutation, au moins l'un d'entre eux étant thermiquement connecté à un capteur de température associé qui est conçu pour capter la température de l'élément de commutation associé.
- Table de cuisson à induction selon l'une quelconque des revendications précédentes, dans laquelle les éléments de commutation et les capteurs de température associés sont montés sur une carte de circuit imprimé (PCB) (44) et les éléments de commutation et/ou les capteurs de température sont préférablement des dispositifs montés en surface.
- Table de cuisson à induction selon la revendication 8, dans laquelle au moins un corps de refroidissement est monté sur la carte de circuit imprimé (PCB) (44) et est thermiquement connecté à un élément de commutation.
- Table de cuisson à induction selon l'une quelconque des revendications précédentes 8 et 9, dans laquelle le capteur de température et l'élément de commutation sont montés sur des côtés opposés de la carte de circuit imprimé (44).
- Table de cuisson à induction selon l'une quelconque des revendications précédentes, la table de cuisson à induction comprenant :
au moins une, préférablement une ou deux cartes d'alimentation, chaque carte d'alimentation comprenant :
au moins un, préférablement un ou deux générateurs d'énergie électrique (20), chaque générateur d'énergie électrique étant associé à une bobine d'induction (34) et comprenant :
au moins un, préférablement un ou deux éléments de commutation, au moins un, préférablement tous les éléments de commutation étant thermiquement connectés à un capteur de température associé, le capteur de température étant conçu pour capter la température de l'élément de commutation respectif. - Table de cuisson à induction selon l'une quelconque des revendications précédentes, la table de cuisson à induction comprenant en outre un microcontrôleur qui est conçu pour recevoir des signaux d'entrée en provenance d'au moins un capteur de température et pour commander la puissance électrique qui est délivrée à un élément de commutation associé au capteur de température.
- Table de cuisson à induction selon l'une quelconque des revendications précédentes, la table de cuisson à induction comprenant en outre au moins un corps de refroidissement et un capteur de température étant fourni par unité de chauffage ou par élément de commutation ou par générateur ou par corps de refroidissement, le corps de refroidissement et le capteur de température et l'élément de commutation étant préférablement montés sur une carte de circuit imprimé (44).
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP17192537.3A EP3461229B1 (fr) | 2017-09-22 | 2017-09-22 | Table de cuisson à induction |
PCT/EP2018/075010 WO2019057653A1 (fr) | 2017-09-22 | 2018-09-17 | Plaque de cuisson à induction |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP17192537.3A EP3461229B1 (fr) | 2017-09-22 | 2017-09-22 | Table de cuisson à induction |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3461229A1 EP3461229A1 (fr) | 2019-03-27 |
EP3461229B1 true EP3461229B1 (fr) | 2022-08-10 |
Family
ID=59930281
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17192537.3A Active EP3461229B1 (fr) | 2017-09-22 | 2017-09-22 | Table de cuisson à induction |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP3461229B1 (fr) |
WO (1) | WO2019057653A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR102040219B1 (ko) | 2018-01-03 | 2019-11-04 | 엘지전자 주식회사 | 간섭 소음 제거 및 출력 제어 기능이 개선된 유도 가열 장치 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001267056A (ja) * | 2001-03-29 | 2001-09-28 | Matsushita Electric Ind Co Ltd | 誘導加熱調理器 |
EP1571707A2 (fr) * | 2004-03-05 | 2005-09-07 | Hitachi Industrial Equipment Systems Co. Ltd. | Méthode de détection de la température d'un dispositif à semiconducteur et dispositif de conversion de puissance |
EP1616463A1 (fr) * | 2003-04-22 | 2006-01-18 | Matsushita Electric Industrial Co., Ltd. | Dispositif de chauffe dielectrique a haute frequence et carte de circuits imprimes a thermistance |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19708653C2 (de) * | 1997-03-04 | 1999-07-08 | Telefunken Microelectron | Vorrichtung zur Bestimmung der Temperatur mindestens eines auf einem Trägerkörper mit geringer Wärmeleitfähigkeit angeordneten Halbleiterbauelements |
JP4301244B2 (ja) * | 2003-10-30 | 2009-07-22 | パナソニック株式会社 | 誘導加熱調理器 |
JP5279748B2 (ja) * | 2010-03-19 | 2013-09-04 | 三菱電機株式会社 | 電磁調理器 |
FR3000178A1 (fr) * | 2012-12-20 | 2014-06-27 | Fagorbrandt Sas | Table de cuisson comprenant un moyen de detection de temperature |
-
2017
- 2017-09-22 EP EP17192537.3A patent/EP3461229B1/fr active Active
-
2018
- 2018-09-17 WO PCT/EP2018/075010 patent/WO2019057653A1/fr active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001267056A (ja) * | 2001-03-29 | 2001-09-28 | Matsushita Electric Ind Co Ltd | 誘導加熱調理器 |
EP1616463A1 (fr) * | 2003-04-22 | 2006-01-18 | Matsushita Electric Industrial Co., Ltd. | Dispositif de chauffe dielectrique a haute frequence et carte de circuits imprimes a thermistance |
EP1571707A2 (fr) * | 2004-03-05 | 2005-09-07 | Hitachi Industrial Equipment Systems Co. Ltd. | Méthode de détection de la température d'un dispositif à semiconducteur et dispositif de conversion de puissance |
Also Published As
Publication number | Publication date |
---|---|
WO2019057653A1 (fr) | 2019-03-28 |
EP3461229A1 (fr) | 2019-03-27 |
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