EP2590475A2 - Dispositif de chauffage à induction - Google Patents

Dispositif de chauffage à induction Download PDF

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Publication number
EP2590475A2
EP2590475A2 EP12190484.1A EP12190484A EP2590475A2 EP 2590475 A2 EP2590475 A2 EP 2590475A2 EP 12190484 A EP12190484 A EP 12190484A EP 2590475 A2 EP2590475 A2 EP 2590475A2
Authority
EP
European Patent Office
Prior art keywords
unit
heating
control unit
induction heating
sensor
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
EP12190484.1A
Other languages
German (de)
English (en)
Other versions
EP2590475A3 (fr
EP2590475B1 (fr
Inventor
Sergio Llorente Gil
Daniel Palacios Tomas
Hector Sarnago Andia
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 Bosch und Siemens 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
Application filed by BSH Bosch und Siemens Hausgeraete GmbH filed Critical BSH Bosch und Siemens Hausgeraete GmbH
Publication of EP2590475A2 publication Critical patent/EP2590475A2/fr
Publication of EP2590475A3 publication Critical patent/EP2590475A3/fr
Application granted granted Critical
Publication of EP2590475B1 publication Critical patent/EP2590475B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H05B6/06—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 invention is based on an induction heating device according to the preamble of claim 1.
  • Induction hobs which have an inductor which is operated pulsed in an operating state in which a heating power is requested which can not be supplied continuously.
  • the object of the invention is in particular to provide a generic device with improved properties in terms of a uniform heating process.
  • the object is achieved by the features of claim 1, while advantageous embodiments and modifications of the invention can be taken from the dependent claims.
  • the invention is based on an induction heating device, in particular an induction hob device, having at least one heating frequency unit, at least one induction heating unit, which is intended to be operated by the heating frequency unit, and at least one control unit, which is intended to pulse the heating frequency unit in at least one operating mode to operate, and with at least one sensor unit.
  • an induction heating device in particular an induction hob device, having at least one heating frequency unit, at least one induction heating unit, which is intended to be operated by the heating frequency unit, and at least one control unit, which is intended to pulse the heating frequency unit in at least one operating mode to operate, and with at least one sensor unit.
  • control unit be provided for pulse parameters, in particular at least one pulse power, a pulse phase distance and / or at least one duration of a pulse phase and / or a rest phase, in particular in at least one operating mode in which a low to medium heating power is required, at least as a function of at least one sensor value of the sensor unit.
  • a "heating frequency unit” should in particular be understood to mean an electrical unit which has an oscillating electrical signal, preferably with a switching 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, for an induction heating unit generated.
  • the heating frequency unit is intended to be one of which Indudictionsweiser required to provide maximum electrical power of at least 1000 W, in particular at least 2000 W, advantageously at least 3000 W, preferably at least 3500 W.
  • the heating frequency unit comprises in particular at least one inverter, which preferably has at least two, preferably series-connected, bidirectional unipolar switches, which are in particular formed by a transistor and a diode connected in parallel, and particularly advantageously at least one damping capacitor connected in parallel to the bidirectional unipolar switches, which is in particular formed by at least one capacitor.
  • An "induction heating unit” is to be understood in particular as a unit having at least one induction heating element.
  • induction heating element is to be understood in particular as a wound electrical conductor, preferably in the form of a circular disk through which high-frequency alternating current flows in at least one operating state.
  • the induction heating element is preferably provided to convert electrical energy into an alternating magnetic field, which is intended to cause in a metallic, preferably at least partially ferromagnetic, heating means, in particular cooking utensils, eddy currents and / or remagnetization effects, which are converted into heat.
  • a “control unit” is to be understood in particular to mean an electronic unit which is preferably at least partially integrated in a control and / or regulating unit of an induction heating device and which is preferably provided to control and / or regulate at least the heating frequency unit.
  • 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.
  • Provided is intended to be understood in particular specially programmed, designed and / or equipped.
  • a “pulsed operation” should in particular be understood as an operating state in which a heating frequency unit alternately, preferably alternately alternately, provides high-frequency alternating current in pulse phases or no current in rest phases.
  • a duration of the pulse phases at least 0.1 s, in particular at least 0.5 s, advantageously at least 1 s, preferably at least 3 s, in particular a maximum of 15 min, advantageously a maximum of 10 min, preferably a maximum of 5 min.
  • the control unit is provided to select a pulse power, ie heating powers during pulse phases, so that a heating power in the time average corresponds to the requested heating power.
  • the heating powers in different, in particular successive, preferably immediately successive, pulse phases are at least substantially the same.
  • a difference in the values amounts to a maximum of 10%, in particular a maximum of 5%, preferably a maximum of 1% of a sum of the values.
  • a duration of a rest phase in at least one operating state is a maximum of 100%, in particular a maximum of 50%, advantageously a maximum of 25%, preferably a maximum of 10%, of a duration of a preceding pulse phase.
  • a "sensor unit” is to be understood in particular a unit which has at least one sensor. In particular, the sensor unit differs from a sensor unit which is provided to determine performance characteristics, in particular a current and / or a voltage of the induction heating unit.
  • a "sensor” should be understood in particular to be an element which is intended to have a preferably physical size, in particular a temperature, a state of cooking, a humidity and / or the like, into another, preferably electrical, parameter of the sensor, for example a voltage, a current and / or an electrical resistance to convert.
  • the control unit is provided, in particular via an assignment function and / or a characteristic value table, to assign a value of the physical variable to a sensor value.
  • a “low to medium” heating power should be understood in particular to mean a heating power which corresponds to a maximum of 70%, in particular a maximum of 50%, preferably a maximum of 30%, of a maximum heating power, in particular a maximum power of the heating frequency unit.
  • a low to medium power is a maximum of 1.5 kW, advantageously a maximum of 1.2 kW, preferably a maximum of 1 kW.
  • a uniform heating process and / or improved comfort can be achieved.
  • the sensor unit is provided to determine a temperature, in particular a temperature of a heating medium and / or a cooking utensil.
  • a sensor element of the sensor unit is as Infrared sensor and / or designed as a thermal sensor.
  • a simple control can be achieved.
  • the sensor unit is intended to be determined, for example, by a vibration sensor, in particular a microphone, a cooking state, for example a warm-up phase, cooking and / or overcooking, of a heated cooking utensil.
  • control unit be provided to set the pulse parameters at least as a function of a fluctuation of the sensor value of the sensor unit.
  • a “fluctuation” should in particular be understood as a value which indicates how much a sensor value on average deviates from an average value of the sensor value, in particular averaged over a period of time between two starting points of immediately consecutive pulse phases.
  • the fluctuation is dependent on a maximum value and / or a minimum value of the sensor value.
  • control unit is provided to set the pulse parameters at least as a function of an operator input, in particular an input control parameter.
  • the induction heating device has at least one input means which allows an operator to set a corresponding control parameter.
  • the control parameter indicates a maximum of a specific parameter, in particular the fluctuation of the sensor value.
  • an operator input causes the control unit to operate independently of sensor values of the sensor unit. In particular, increased comfort can be achieved.
  • the control unit is provided for pulsed operation of the heating frequency unit in at least one operating mode in which a heating power is required for the at least one induction heating unit, which is available in a continuous operation from the heating frequency unit to the induction heating unit.
  • a "requested heating power” is to be understood in particular a setting made by an operator via an operating unit.
  • a value of an electrical power, in particular in watts, and / or a power level, which is preferably assigned by the control unit to an electrical power can be used. be set.
  • the requested heating power can be set by the control unit as part of a cooking program.
  • a heating power is particularly available in a "continuous operation" when an electrical efficiency of a total used heating electronics, in particular at least the Schufrequenzaji, a rectifier unit, the induction heating unit and / or the control unit is greater than at least 85%, in particular at least 90%, advantageous at least 93%, preferably at least 95%.
  • a power loss of the heating electronics is not more than 15%, in particular not more than 10%, advantageously not more than 7%, preferably not more than 5%, of a heating power which is output to a heating means via the induction heating unit.
  • a heating power in a continuous operation is available when a switching frequency of the heating frequency unit, which is necessary to generate the heating power is less than 120 kHz, in particular less than 110 kHz, preferably less than 100 kHz.
  • a switching frequency of the heating frequency unit which is necessary to generate the heating power is less than 120 kHz, in particular less than 110 kHz, preferably less than 100 kHz.
  • an increased electrical efficiency can be achieved because at higher powers can be worked with lower switching frequencies, whereby lower losses occur in the heating frequency unit and other power electronics.
  • the control unit is provided in at least one operating mode to set pulse parameters at least as a function of at least one characteristic, in particular a characteristic curve which assigns a minimum pulse phase spacing to a power, preferably a flicker characteristic.
  • a "pulse phase distance" is to be understood in particular as a distance between start times of two pulse phases, preferably immediately consecutive pulse phases.
  • at least in the one operating mode successive pulse phase intervals are at least substantially equal.
  • a flicker characteristic should in particular be understood to mean a characteristic curve which determines how large a pulse phase spacing as a function of a pulse power should be at least in order to avoid disturbances in a power network and / or comfort restrictions, for example by flickering light. In particular, increased comfort and / or improved network stability can be achieved.
  • control unit be provided, at least in response to an operator input, preferably from a Heating power requirement and / or adjustment differs in the at least one operating mode between a pulsed operation and a continuous operation switch.
  • the induction heating device has at least one operating element, in particular a touch-sensitive operating surface and / or a menu item in a control menu, which is provided to provide the control unit with a signal for switching over. In particular, increased comfort can be achieved.
  • control unit be provided to dispense with an adjustment of the pulse parameters as a function of sensor values of the sensor unit in at least one operating mode during a start phase of a heating process.
  • a start phase is to be understood as meaning a time range between a heating power requirement and a point in time at which a preset sensor value and / or a preset time duration has been reached.
  • Such a device is particularly advantageously arranged in an induction hob and / or in an oven with induction heating.
  • FIG. 1 shows a designed as an induction hob home appliance 10 with an induction heater designed as an induction heating 12.
  • the induction heating 12 has four formed as an inverter Schufrequenzakuen 20, 22, 24, 26 on.
  • the induction heating device 12 has four induction heating units 30, 32, 34, 36 formed as inductors, which are each intended to be operated by different heating frequency units 20, 22, 24, 26.
  • the induction heating units 30, 32, 34, 36 are disposed below a cooktop panel and are intended to heat cooking dishes placed on the cooktop panel positioned above the induction heating units 30, 32, 34, 36.
  • the hob device sensor units 40, 42, 44, 46 which are arranged in centers of the induction heating units 30, 32, 34, 36.
  • the sensor units 40, 42, 44, 46 have sensor elements designed as infrared sensors. Furthermore, the induction heating device 12 has a control unit 14 and an operator interface 16.
  • the operator interface 16 is intended to enable an operator to request heating powers for the induction heating units 30, 32, 34, 36 via control elements and to output currently set power levels to display units.
  • the control unit 14 is provided to process inputs of the user interface 16, to control displays of the display units of the user interface 16 and to control the heating frequency units 20, 22, 24, 26 such that the induction heating units 30, 32, 34, 36 deliver powers on average that correspond to heating powers that are requested via the operator interface 16.
  • the control unit 14 is provided for pulsing the heating-frequency units 20, 22, 24, 26 in each case in an operating mode ( FIG. 2 ).
  • the induction heating unit 30, 32, 34, 36 is provided to generate in the operating mode periodically alternately during pulse phases 60, 62 with a pulse phase duration t ON high-frequency alternating current, which leads to a pulse power P pulse , and during rest periods 61, 63 with a rest phase duration t off to produce no high-frequency alternating current.
  • An average heating power corresponds to the requested heating power P mean .
  • the control unit 14 is further provided for setting pulse parameters, ie a pulse phase distance t flicker , the pulse phase duration t ON and the pulse power P pulse in each case as a function of sensor values T of the sensor unit 40, 42, 44, 46.
  • the sensor units 40, 42, 44, 46 are each intended to determine temperatures of cooking utensils placed on the hob plate.
  • the control unit 14 is provided to set the pulse parameters as a function of a fluctuation S, S 'of the sensor value T of the sensor units 40, 42, 44, 46 ( FIG. 3 ).
  • a temperature difference .DELTA.T, .DELTA.T ' is a difference of a last measured local maximum value T max , T max ' and a last measured local minimum value T min , T min '. If the control unit 14 determines a fluctuation S, S 'having a value greater than a predetermined maximum fluctuation S max , the control unit 14 reduces the pulse phase interval t flicker .
  • control unit 14 determines a fluctuation S, S 'having a value less than a predetermined minimum fluctuation S min .
  • the control unit 14 increases the pulse phase distance t flicker .
  • the pulse phase distance t flicker is thereby changed by 5% of its value.
  • the maximum fluctuation S max and the minimum fluctuation S min are determined by an operator input via the operator interface 16.
  • the control unit 14 provides an operator with different cooking modes, such as "milk”, “cooking”, “frying”, for selection, to which specific maximum fluctuations S max , eg 2 K, 7 K, 20 K, are assigned.
  • a minimum variation S min is set at 70% of S max .
  • the pulse phase spacing t flicker can be changed by arbitrary proportions between 0% and 50% of its value.
  • an operator via the operator interface 16 also directly set a value, in the form of a number, the maximum fluctuation S max .
  • FIG. 4 shows by way of example how the fluctuation S behaves in dependence on the pulse power P pulse for different quantities to be heated.
  • the left curve stands for 1 kg of water and the right curve for 6 kg of water.
  • the control unit 14 is provided to the heating frequency units 20, 22, 24, 26 in an operating mode in which for the corresponding induction heating unit 30, 32, 34, 36 a heating power P mean is requested, in a continuous operation of the heating frequency unit 20, 22 , 24, 26 to the induction heating unit 30, 32, 34, 36 is available to operate pulsed.
  • a permanently deliverable power is determined by an efficiency ⁇ of electronics of the induction heating device 12 ( FIG. 6 ). In this case, for average cooking utensils, heating powers P, which are above a minimum heating power P min , permanently available, since for them the efficiency ⁇ der electronics is greater than a minimum efficiency ⁇ min . The minimum efficiency ⁇ min is 95%. This results in a minimum heating power P min of 500 W.
  • the control unit 14 is provided in the one operating mode to set a pulse phase spacing t flicker and a pulse power P puls as a function of a flicker characteristic f flicker .
  • a flicker characteristic f Flicker is shown, as defined by national standards. The following information refers to the Spanish Flickernorm.
  • the control unit 14 assigns to a pulse power P 1 of 500 W a pulse phase distance t 1 of 6 s, a pulse power P 2 of 2200 W a pulse phase distance t 2 of 32 s and a pulse power P 3 of 3300 W a pulse phase distance t 3 of 170 s to.
  • the control unit 14 can assign a pulse power P pulse via the patch characteristic f Flicker to a pulse phase distance tp hcker .
  • a requested heating power P mean is assigned by the control unit 14, a pulse power P pulse and a pulse phase distance t flicker . If an adjustment of the pulse phase spacing t flicker occurs due to the fluctuation S being too small or too high due to the control unit 14, the control unit 14 uses the new pulse phase spacing t flicker to determine a new pulse power P puls as a function of the flicker characteristic f flicker .
  • control unit 14 is provided to switch between a pulsed operation and a continuous operation in the one operating mode depending on an operator input via the operator interface 16. This allows an operator to flexibly switch between a power saving mode and a conventional mode.
  • control unit 14 may be provided, when a maximum fluctuation S max of 0 K is entered via the operator interface 16, to switch to continuous operation.
  • the operator interface 16 may include a control provided to send a pulsed mode on / off signal to the control unit 14.
  • the control unit 14 is provided to dispense with an adaptation of the pulse parameters as a function of sensor values T of the sensor unit 40, 42, 44, 46 in the operating mode during a start phase of a heating operation.
  • the starting phase is characterized by large changes in temperature, which leads to a regulation of the pulse phase spacing t flicker and the variables associated therewith, pulse power P puls and pulse phase duration t ON .
  • a temperature of 70 ° C. is reached, an adaptation of the pulse parameters as a function of sensor values T of the sensor unit 40, 42, 44, 46 starts.
  • a cooking mode is selected, depending on the cooking mode, an adjustment of the pulse parameters is made only from a higher temperature, for example 90 ° C. for "cooking", 200 ° C. for "frying".
  • control unit 14 is provided to operate the heating frequency unit 20, 22, 24, 26 at heating powers P mean , which are greater than low to medium heat outputs, ie, for example, greater than 1000 W, to operate continuously.
  • Embodiments of the invention are also conceivable in which a heating frequency unit is provided to operate a plurality of induction heating units alternately.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Induction Heating Cooking Devices (AREA)
  • General Induction Heating (AREA)
EP12190484.1A 2011-11-04 2012-10-30 Dispositif de chauffage à induction Active EP2590475B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ES201131766 2011-11-04

Publications (3)

Publication Number Publication Date
EP2590475A2 true EP2590475A2 (fr) 2013-05-08
EP2590475A3 EP2590475A3 (fr) 2018-06-20
EP2590475B1 EP2590475B1 (fr) 2019-12-11

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP12190484.1A Active EP2590475B1 (fr) 2011-11-04 2012-10-30 Dispositif de chauffage à induction

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3013121A4 (fr) * 2013-06-18 2016-06-29 Panasonic Ip Man Co Ltd Plaque de cuisson à induction

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3814888A (en) * 1971-11-19 1974-06-04 Gen Electric Solid state induction cooking appliance
US4638135A (en) * 1984-01-20 1987-01-20 Kabushiki Kaisha Toshiba Induction heat cooking apparatus
JP4162577B2 (ja) * 2003-11-25 2008-10-08 株式会社東芝 加熱調理器およびその加熱調理器に用いられる調理器具
TW200702968A (en) * 2005-07-12 2007-01-16 Holtek Semiconductor Inc Architecture and method of power-controlling circuit applicable to electronic cooker
CN101307924B (zh) * 2008-06-06 2010-06-16 叶小舟 一种设有磁感应测温装置的电磁炉
ATE520279T1 (de) * 2008-12-22 2011-08-15 Fagorbrandt Sas Verfahren zur stromversorgung mit der leistung von zwei induktoren und kochgerät, bei dem dieses verfahren umgesetzt ist

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3013121A4 (fr) * 2013-06-18 2016-06-29 Panasonic Ip Man Co Ltd Plaque de cuisson à induction

Also Published As

Publication number Publication date
EP2590475A3 (fr) 2018-06-20
EP2590475B1 (fr) 2019-12-11

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