EP3461229A1 - Table de cuisson à induction - Google Patents
Table de cuisson à induction Download PDFInfo
- Publication number
- EP3461229A1 EP3461229A1 EP17192537.3A EP17192537A EP3461229A1 EP 3461229 A1 EP3461229 A1 EP 3461229A1 EP 17192537 A EP17192537 A EP 17192537A EP 3461229 A1 EP3461229 A1 EP 3461229A1
- 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.)
- Granted
Links
- 230000006698 induction Effects 0.000 title claims abstract description 54
- 238000010411 cooking Methods 0.000 title claims abstract description 38
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 238000001816 cooling Methods 0.000 claims description 21
- 239000003990 capacitor Substances 0.000 claims description 4
- 239000004065 semiconductor Substances 0.000 claims description 2
- 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
- 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
- 230000001419 dependent effect Effects 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
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.
- 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 object of the present invention is achieved by the induction cooking hob according to claim 1.
- 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:
- 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 can be 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.
- FIG. 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 Vcc 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 FIG. 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 can be provided and replaced in or nearby an air inlet of such a cooling fan and can be 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)
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 true EP3461229A1 (fr) | 2019-03-27 |
EP3461229B1 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) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3737209A4 (fr) * | 2018-01-03 | 2021-09-01 | LG Electronics Inc. | Appareil de chauffage par induction doté de fonctions d'annulation de bruit d'interférence et de commande de sortie améliorées |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1679938A1 (fr) * | 2003-10-30 | 2006-07-12 | Matsushita Electric Industrial Co., Ltd. | Dispositif de cuisson a chauffage par induction |
JP2011198621A (ja) * | 2010-03-19 | 2011-10-06 | Mitsubishi Electric Corp | 電磁調理器 |
EP2746672A1 (fr) * | 2012-12-20 | 2014-06-25 | FagorBrandt SAS | Table de cuisson comprenant un moyen de détection de température |
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 |
JP3656565B2 (ja) * | 2001-03-29 | 2005-06-08 | 松下電器産業株式会社 | 誘導加熱調理器 |
EP1616463B1 (fr) * | 2003-04-22 | 2015-06-10 | Panasonic Corporation | Dispositif de chauffe dielectrique a haute frequence et carte de circuits imprimes a thermistance |
TW200530566A (en) * | 2004-03-05 | 2005-09-16 | Hitachi Ind Equipment Sys | Method for detecting temperature of semiconductor element and semiconductor power converter |
-
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 |
---|---|---|---|---|
EP1679938A1 (fr) * | 2003-10-30 | 2006-07-12 | Matsushita Electric Industrial Co., Ltd. | Dispositif de cuisson a chauffage par induction |
JP2011198621A (ja) * | 2010-03-19 | 2011-10-06 | Mitsubishi Electric Corp | 電磁調理器 |
EP2746672A1 (fr) * | 2012-12-20 | 2014-06-25 | FagorBrandt SAS | Table de cuisson comprenant un moyen de détection de température |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3737209A4 (fr) * | 2018-01-03 | 2021-09-01 | LG Electronics Inc. | Appareil de chauffage par induction doté de fonctions d'annulation de bruit d'interférence et de commande de sortie améliorées |
US11533789B2 (en) | 2018-01-03 | 2022-12-20 | Lg Electronics Inc. | Induction heating apparatus having improved interference noise cancellation and output control functions |
Also Published As
Publication number | Publication date |
---|---|
EP3461229B1 (fr) | 2022-08-10 |
WO2019057653A1 (fr) | 2019-03-28 |
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