EP3066888A1 - Dispositif table de cuisson à induction - Google Patents

Dispositif table de cuisson à induction

Info

Publication number
EP3066888A1
EP3066888A1 EP14806727.5A EP14806727A EP3066888A1 EP 3066888 A1 EP3066888 A1 EP 3066888A1 EP 14806727 A EP14806727 A EP 14806727A EP 3066888 A1 EP3066888 A1 EP 3066888A1
Authority
EP
European Patent Office
Prior art keywords
induction
induction heating
detection circuit
unit
heating
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
Application number
EP14806727.5A
Other languages
German (de)
English (en)
Other versions
EP3066888B1 (fr
Inventor
Nicolas Blasco Rueda
Oscar Garcia-Izquierdo Gango
Ignacio Garde Aranda
Oscar Gracia Campos
Pablo Jesus Hernandez Blasco
Daniel Palacios Tomas
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.)
BSH Hausgeraete GmbH
Original Assignee
BSH Hausgeraete GmbH
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=52007238&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP3066888(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by BSH Hausgeraete GmbH filed Critical BSH Hausgeraete GmbH
Publication of EP3066888A1 publication Critical patent/EP3066888A1/fr
Application granted granted Critical
Publication of EP3066888B1 publication Critical patent/EP3066888B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/06—Control, e.g. of temperature, of power
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C7/00—Stoves or ranges heated by electric energy
    • F24C7/08—Arrangement or mounting of control or safety devices
    • F24C7/087—Arrangement or mounting of control or safety devices of electric circuits regulating heat
    • F24C7/088—Arrangement or mounting of control or safety devices of electric circuits regulating heat on stoves
    • 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
    • H05B2213/03—Heating plates made out of a matrix of heating elements that can define heating areas adapted to cookware randomly placed on the heating plate
    • 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
    • H05B2213/05—Heating plates with pan detection means

Definitions

  • the invention is based on an induction hob apparatus according to the preamble of claim 1.
  • Induction heating is provided for a detection of erected cooking utensils, known.
  • the induction heating element is connected via a relay either with a
  • Heating frequency unit or connected to the detection circuit.
  • Detection circuit is thus connected only in the corresponding switching position of the relay with the induction heating.
  • the invention is based on an induction hob apparatus with at least one induction heating element which is provided for heating cooking utensils, and with at least one detection circuit which, in cooperation with the at least one induction heating element, is provided at least for the detection of erected cooking utensils.
  • the at least one detection circuit is connected to the at least one induction heating element independently of an operating state.
  • An “induction heating element” is to be understood as meaning, in particular, a part, in particular a subassembly, of an induction cooktop.
  • An “induction heating element” is to be understood in particular as a wound electrical conductor which is flowed through in at least one operating state by high-frequency alternating current, in particular heating current. In particular, that is
  • Induction heating element designed to convert electrical energy into a magnetic alternating field, which is intended, in a metallic, preferably at least partially ferromagnetic, garland eddy currents and / or Ummagnethnes monoe cause, which are converted into heat.
  • the induction heating element is intended to cause heating of the cooking utensil.
  • the induction hob device comprises at least two, in particular at least three, advantageously at least four, particularly advantageously at least eight, preferably at least ten, particularly preferably a plurality of induction heating elements. Under a "detection circuit" should
  • an electrical circuit can be understood, which is provided in response to mounted in an installed position above the induction heating Garware for changing at least one detection characteristic.
  • the detection circuit is at least in an operating state of at least one
  • the detection circuit is provided as a function of cooking utensils installed in an installed position above the induction heating element for changing at least one frequency of the detection current.
  • the detection circuit could be provided in response to a set up in an installed position above the induction heating Garware for changing at least one phase angle of the detection current. Also conceivable are further detection parameters that appear appropriate to a person skilled in the art.
  • the detection circuit is provided to be supplied by at least one sensor current supply unit, which is in particular formed separately from at least one power current supply unit to supply the at least one induction heating.
  • the sensor current supply unit which is in particular formed separately from at least one power current supply unit to supply the at least one induction heating.
  • Induction hob device at least two, in particular at least three, advantageously at least four, more preferably at least eight, preferably at least ten, more preferably a plurality of detection circuits.
  • a number of induction heating elements and a number of detection circuits are at least substantially, in particular exactly the same.
  • a detection circuit with at least two, in particular with at least three, advantageously with at least four, particularly advantageously connected to a plurality of induction heating elements.
  • independent of an operating state should be understood to mean, in particular, independently of at least one position of at least one switching element and / or independent of a current flow through the induction heating element
  • Operating state "directly" connected to the induction heater is intended in particular be understood that the detection circuit and the induction heating in any operating condition, in particular at least for alternating current form a closed circuit.
  • electric current in particular alternating current, flows through the closed circuit.
  • the detection circuit in each operating state is flowed through by a detection current corresponding to a heating current.
  • Operating state exists in particular at least one, in particular at least for alternating current, electrically conductive connection between the detection circuit and the induction heating.
  • Detection circuit and the induction heater free of switching elements, in particular of relays and / or transistors.
  • the term "provided” should be understood to mean specially programmed, designed and / or equipped.Assuming that an object is intended for a specific function should in particular mean that the object fulfills this specific function in at least one application and / or operating state and / or performs.
  • the embodiment according to the invention makes it possible to provide an induction hob unit with an advantageous construction. In particular, low production costs can be achieved. In particular, on switching elements for establishing a connection between the detection circuit and the
  • Induction heating be dispensed with.
  • problems due to low current through contacts of a switching element, in particular a relay can be avoided.
  • a detection can advantageously be carried out independently of a switching position of a switching element, in particular of a relay.
  • the part is provided at least one power circuit and at least for heating cooking utensils, and with at least one
  • Detection circuit which is provided at least for a detection of cooking utensils and in at least one operating state, the at least one induction heating, wherein the at least one detection circuit comprises at least one protection unit which is connected to the at least one induction heating element and branches off from the at least one power circuit.
  • the protection unit is included in particular provided for independently of an operating state, in particular at least in a heating operating state, at least the at least one
  • the at least one protection unit is provided to at least substantially prevent the penetration of, in particular, high-frequency heating current into the detection circuit.
  • a value of a frequency differs from one
  • "External voltages" should be understood in particular voltages that advantageously in an operating state via at least one Heating frequency unit and / or over the at least one
  • Voltages are understood in particular to be voltages which are in particular intended to be used in an operating state for operating the at least one induction heating element
  • Protection unit is provided to "at least substantially prevent the ingress of particular high-frequency heating current in the detection circuit, should be understood in particular that the protection unit is intended to a proportion of not more than 50%, in particular of at most 30%, preferably of maximum 15%, particularly advantageously of not more than 10%, preferably of not more than 5% and more preferably of not more than 2%, of heating current striking the protective unit on one side from passing, in particular reaching a second side facing away from the first side, to prevent the protective unit
  • an induction hob device with an advantageous construction can be provided, wherein advantageously an accurate detection of cooking utensil can be achieved.
  • the induction hob device comprises at least one heating frequency unit for supplying the at least one induction heating element, wherein the at least one detection circuit is a connection between the at least one heating frequency unit and the at least one
  • a "heating frequency unit” should in particular be understood to mean an electrical unit which has an oscillating electrical signal, preferably with a frequency of at least 1 kHz, in particular of at least 10 kHz, advantageously of at least 20 kHz and in particular of not more than 100 kHz generates at least one induction heating element.
  • the heating frequency unit is provided to provide a, required by the induction heating, maximum electrical power of at least 100 W, in particular at least 500 W, advantageously at least 1000 W and preferably at least 1500 W.
  • the Schufrequenzü advantageously comprises at least one inverter, preferably at least two, preferably in series, bidirectional unipolar switches, which are formed in particular by a transistor and a parallel diode, and particularly advantageously at least one parallel to the bidirectional unipolar switches switched buffer capacity, which is in particular formed by at least one capacitor.
  • a voltage tap of the heating frequency unit is arranged in particular at a common contact point of two bidirectional unipolar switches.
  • the at least one heating frequency unit and the at least one induction heating element form the at least one at least in an operating state
  • a "connection" between the heating frequency unit and the induction heating element should in particular be understood as bridging at least one distance between the heating frequency unit and the induction heating element, which is electrically conductive in at least one operating state
  • the detection circuit is "branched off” from a connection between the heating frequency unit and the induction heating element, it should be understood in particular that at least one and preferably exactly one electrically conductive contact point exists by means of which the detection circuit is connected to the Connection between the heating frequency unit and the induction heater is connected. This can be achieved in particular a precise detection of erected on the induction heating cookware.
  • the induction hob unit comprises at least one protection unit which is provided, at least the at least one detection circuit, independently of an operating state, in particular at least in a heating operating state, in particular during operation of the at least one
  • Detection circuit can be avoided.
  • components that are suitable for Low voltage are designed to be used instead of components that are designed for high performance, which in particular a low-cost design can be achieved.
  • the at least one protection unit be independent of an operating state between an input of the at least one
  • the protection unit is independent of one
  • the protection unit is independent of one
  • the at least one protection unit has at least one capacitor.
  • the capacitor differs from a capacitor of the power resonant circuit, in particular of one
  • Attenuation capacitor and / or a resonance capacitor As a result, in particular a cost-effective design can be achieved.
  • the at least one detection circuit and the at least one induction heating element be at least in an operating state
  • Circuit can be understood, which comprises at least the induction heating element and at least one capacitance, which is in particular part of the detection circuit.
  • the detection circuit and the induction heating element are provided to perform electrical oscillations at least in one operating state.
  • the induction hob unit comprises a control unit which is provided to determine at least one cooking appliance characteristic as a function of a natural frequency change of the at least one detection circuit.
  • control unit is intended in particular an electronic unit be understood, which is preferably at least partially integrated in a control and / or regulating unit of an induction hob and which is preferably provided to control at least the heating frequency unit and / or to regulate.
  • the control unit preferably comprises a computing unit and, in particular in addition to the computing unit, a memory unit with a control and / or regulating program stored therein, which is intended to be executed by the computing unit.
  • the control unit has at least one amplifier at least to an amplification of the detection current.
  • the control unit has at least one analog-to-digital converter at least for a conversion of the detection current.
  • the cooking utensil characteristic is designed as the presence and / or absence of erected cooking utensils.
  • the cooking utensil characteristic is designed as a size and / or shape and / or material of cooking utensils.
  • further embodiments of the cooking appliance characteristic appearing appropriate to a person skilled in the art are conceivable. This can be achieved in particular a high level of comfort for an operator.
  • the cooking utensil characteristic can be determined exactly.
  • the at least one detection circuit is provided for cooking utensils, in particular exclusively, outside one
  • the heating frequency unit in particular the buffering capacity of the heating frequency unit, is provided to prevent, in particular to block, the detection of upright cooking utensils in the heating operating state.
  • the buffering capacity is provided to short-circuit the detection circuit in the heating mode.
  • FIG. 2 shows an application example of the induction cooktop apparatus from FIG. 1 in a schematic illustration
  • FIG. 3 shows a detail of the induction cooktop apparatus from FIG. 1 in a greatly simplified schematic representation
  • Fig. 4 shows a detail of an alternative embodiment of
  • FIG. 1 shows an induction hob 30 with an inventive
  • the induction hob 30 has a base body 32 for setting up cooking utensils.
  • the main body 32 is formed as a hob plate.
  • the main body 32 forms a cooking surface.
  • the induction hob 30 includes an operating unit 34 for inputting and / or selecting
  • the operating unit 34 is provided for outputting a value of an operating parameter to an operator.
  • the induction cooktop apparatus 10 comprises a control unit 28, which is provided to execute actions and / or to change settings in dependence on operating parameters entered by the operating unit 34.
  • the induction hob device 10 comprises a plurality of induction heating elements 12, which are provided for heating up cooking utensils (see FIG. 2).
  • the induction heating elements 12 form a variable cooking surface area.
  • the induction heating elements 12 form a hob matrix. In an alternative embodiment, it is conceivable that the
  • the induction hob unit 10 comprises a plurality of heating frequency units 16 for supplying the induction heating elements 12.
  • the heating frequency units 16 are part of a power current supply unit 48, which is used to supply the Induction heating 12 is provided.
  • Each heating frequency unit 16 includes an inverter.
  • Each heating frequency unit 16 includes two series-connected bidirectional unipolar switches.
  • Each heating frequency unit 16 comprises two buffer capacities 42 connected in series. In each case one buffer capacity 42 is connected in parallel with one of the unipolar switches. In an operating state, the generate
  • the High-frequency alternating current is as a heating current
  • the heating current has a frequency of several kilohertz.
  • the heating current could have a frequency between 25 kHz and 75 kHz.
  • the frequencies which appear reasonable to a person skilled in the art are conceivable.
  • the heating frequency units 16 are connected by means of an electrically conductive connection 18 to the induction heating elements 12.
  • the induction heating elements 12 are connected to the heating frequency units 16 facing away from connection points 46 via a
  • the Bank Resonance unit 56 connected to ground.
  • the Schufrequenzüen 16 form in a heating mode with the induction heaters 12 and a part of
  • the Resonance unit 56 from a power circuit.
  • the induction hob device 10 includes the resonance unit 56.
  • the resonance unit 56 includes for each
  • Induction heating 12 a resonance capacity.
  • Each resonant capacitance has two capacitors.
  • the induction hob device 10 comprises a circuit unit 36 which is provided to make or break the connection 18 between the heating frequency units 16 and the induction heating elements 12.
  • the circuit unit 36 comprises a plurality of switching elements, wherein in each case one switching element in one of
  • the circuit unit 36 is of the
  • Control unit 28 controllable.
  • the induction hob apparatus 10 includes a plurality of rectifiers 38 connected to a phase 40 of a utility network (see Fig. 2).
  • the rectifiers 38 rectify an AC coupled through phase 40.
  • a rectifier 38 is connected to two Schufrequenzakuen 16. Two each
  • the induction hob device 10 comprises a plurality of detection circuits 14. Each detection circuit 14 is provided in cooperation with a respective induction heating element 12 for the detection of erected cooking utensils.
  • Each detection circuit 14 is provided in cooperation with a respective induction heating element 12 for the detection of erected cooking utensils.
  • Detection circuit 14 is directly connected to one of the induction heaters 12 regardless of an operating condition (see Fig. 3).
  • the detection circuits 14 are independent of a switching position of the circuit unit 36 directly with the
  • connection point 44 of the induction heating 12 connected.
  • the detection circuits 14 are branched off from the connections 18 between the heating frequency units 16 and the induction heating elements 12.
  • the branches 24 of the connections 18 between the heating frequency units 16 and the induction heating elements 12 are arranged between the heating frequency units 16 facing connection points 44 and the circuit unit 36.
  • the induction hob device 10 includes a plurality of protection units 20, which are provided to protect the detection circuits 14 from external stresses regardless of an operating state.
  • the protection units 20 are connected to the detection circuits 14 facing sides of the branches 24, regardless of an operating condition.
  • the protection units 20 are connected independently of an operating state between an input 22 of the detection circuits 14 and the branches 24 of the connections 18 between the heating frequency units 16 and the induction heating elements 12.
  • the protection units 20 each have a capacitor 26. In the present embodiment, the
  • Capacitors 26 capacitances of substantially 100 pF on.
  • the protection units 20 have a resistance of between 200 k ⁇ and 600 k ⁇ in a heating operation state for the heating current.
  • capacitors with a Capacity in a range of 50 pF to 150 pF conceivable.
  • the protection unit could be any series and / or parallel connection of
  • the induction hob device 10 comprises a sensor current supply unit 50, which is provided to supply the detection circuits 14 with detection current.
  • the sensor power supply unit 50 is provided to supply the control unit 28.
  • the sensor power supply unit 50 and the power power supply unit 48 are formed separately.
  • the sensor power supply unit 50 is connected to a phase 52 of the supply network.
  • the phase 52 to which the sensor current supply unit 50 is connected is different from the phase 40 to which the power current supply unit 48 is connected.
  • the power current supply unit and the sensor power supply unit are connected to the same phase. In both cases, the induction heating elements 12 and the detection circuits 14 become independent
  • the detection circuits 14 act in an operating state, the induction heating 12 with high-frequency
  • the detection current has a frequency of a few MHz.
  • the detection current in an operating state could have a frequency between 1.5 MHz and 2.2 MHz.
  • further frequencies which appear reasonable to a person skilled in the art are conceivable.
  • Protection units 20 have a resistance of between 0.7 kQ and 1 k ⁇ for the detection current. In the operating state forms one of
  • Detection circuits 14 and one of the induction heating 12 each from a resonant circuit.
  • a frequency of the detection current is substantially 1.5 MHz.
  • Garware increases the frequency of the detection current depending on size, shape and material of set up Cooking containers.
  • an output 54 of one of the detection circuits 14 is connected to the control unit 28.
  • the output 54 of the detection circuit 14 is connected via the control unit 28 to ground.
  • the control unit 28 determines a function of a natural frequency change of the detection circuit 14 a
  • the control unit 28 determines based on a size of the
  • Induction heating elements heat up 12 cooking utensils installed.
  • a heating mode at least one of the connections 18 between the heating frequency units 16 and the induction heating elements 12 is established. In a heating mode, those of the connections 18 between the
  • Detection circuits 14 short-circuited by the buffer capacitances 42 of the heating frequency unit 16.
  • the buffer capacities 42 are at a frequency of
  • Indutationsloomettin 12 connected detection circuits 14 are shorted.
  • high-frequency alternating currents having a substantially same frequency as the heating currents flow through the oscillation circuits formed by the induction heating elements 12 and the detection circuits 14.
  • Detection circuits 14 detect installed cooking utensils outside of one
  • Oscillation circuits detection currents.
  • Detection circuits is less than a number of induction heating elements. In this case, the detection circuits by multiplexing with several
  • Detection circuit is arranged.
  • Heating frequency units facing away from connection points of the induction heating are connected. This could be between the outputs of the detection circuits and the heating frequency units facing away from the connection points
  • each a further protection unit in particular in addition to the protection unit, which branches off from the connection between the heating frequency unit and the induction heating, may be provided.
  • control unit is provided to a
  • Heating operation state in particular to allow operation of the induction heating, in particular exclusively when the cooking utensils are set up and to prevent in particular in gargeschirrenfin state.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Induction Heating Cooking Devices (AREA)

Abstract

L'invention concerne un dispositif table de cuisson à induction (10) comportant au moins un élément de chauffe à induction (12) qui sert à chauffer des récipients de cuisson, et au moins un circuit de détection (14) qui sert, en coopération avec l'au moins un élément de chauffe à induction (12), à détecter le récipient de cuisson. L'objet de la présente invention est la mise au point d'un appareil de ce type de conception avantageuse. À cet effet, l'au moins un circuit de détection (14) est relié directement, indépendamment d'un état de fonctionnement, à l'au moins un élément de chauffe à induction (12).
EP14806727.5A 2013-11-05 2014-10-27 Dispositif table de cuisson à induction Active EP3066888B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES201331611A ES2535245B1 (es) 2013-11-05 2013-11-05 Dispositivo de campo de cocción por inducción
PCT/IB2014/065630 WO2015068077A1 (fr) 2013-11-05 2014-10-27 Dispositif table de cuisson à induction

Publications (2)

Publication Number Publication Date
EP3066888A1 true EP3066888A1 (fr) 2016-09-14
EP3066888B1 EP3066888B1 (fr) 2019-08-07

Family

ID=52007238

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14806727.5A Active EP3066888B1 (fr) 2013-11-05 2014-10-27 Dispositif table de cuisson à induction

Country Status (4)

Country Link
US (1) US10694589B2 (fr)
EP (1) EP3066888B1 (fr)
ES (2) ES2535245B1 (fr)
WO (1) WO2015068077A1 (fr)

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KR102069581B1 (ko) * 2017-06-26 2020-01-23 엘지전자 주식회사 유도 가열 장치 및 유도 가열 장치의 제어 방법
CN109458638B (zh) * 2018-08-17 2020-09-08 浙江绍兴苏泊尔生活电器有限公司 电磁炉功率控制方法及电磁炉
CN112393280A (zh) * 2019-08-19 2021-02-23 广东美的白色家电技术创新中心有限公司 一种电磁灶台和电磁灶台的控制方法

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DE4208249A1 (de) 1992-03-14 1993-09-16 Ego Elektro Blanc & Fischer Induktive kochstellenbeheizung und verfahren zu ihrem betrieb
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Also Published As

Publication number Publication date
US10694589B2 (en) 2020-06-23
EP3066888B1 (fr) 2019-08-07
ES2535245A1 (es) 2015-05-07
ES2747917T3 (es) 2020-03-12
US20160262213A1 (en) 2016-09-08
ES2535245B1 (es) 2016-02-16
WO2015068077A1 (fr) 2015-05-14

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