WO2013084115A1 - Dispositif de chauffe par induction - Google Patents

Dispositif de chauffe par induction Download PDF

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Publication number
WO2013084115A1
WO2013084115A1 PCT/IB2012/056816 IB2012056816W WO2013084115A1 WO 2013084115 A1 WO2013084115 A1 WO 2013084115A1 IB 2012056816 W IB2012056816 W IB 2012056816W WO 2013084115 A1 WO2013084115 A1 WO 2013084115A1
Authority
WO
WIPO (PCT)
Prior art keywords
switching elements
control unit
induction heating
induction
switching
Prior art date
Application number
PCT/IB2012/056816
Other languages
German (de)
English (en)
Inventor
Daniel Anton Falcon
Carlos CALVO MESTRE
Sergio Llorente Gil
Daniel Palacios Tomas
Diego Puyal Puente
Hector Sarnago Andia
Original Assignee
BSH Bosch und Siemens Hausgeräte 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 Hausgeräte GmbH filed Critical BSH Bosch und Siemens Hausgeräte GmbH
Priority to EP12815792.2A priority Critical patent/EP2789208B1/fr
Publication of WO2013084115A1 publication Critical patent/WO2013084115A1/fr

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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

Definitions

  • the invention is based on an induction heating device according to the preamble of claim 1.
  • Induction hob devices having inverters connected in parallel to an inductor.
  • the object of the invention is in particular to provide a generic device with improved heating properties.
  • 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 a
  • Induction hob device with at least two switching elements, which are connected in parallel and provided in at least one operating mode, a
  • control unit be provided to actuate at least two of the at least two switching elements with different activity parameters, at least in the operating mode.
  • switching element is to be understood as meaning, in particular, an electrical component which is intended to produce and / or to separate at least one electrical connection between at least two power contacts of the switching element
  • the switching element preferably as a transistor, in particular as an IGBT formed.
  • the switching element has at least one control contact, which is provided only to an adjustment of a switching state of
  • Switching element in particular by a control unit to allow. It is to be understood in particular from the fact that two switching elements are "connected in parallel" that poles of the same name, in particular at least identical power contacts, of the switching elements are directly connected to one another
  • an electrical connection can be understood which, at least in an operating state with a current flow of alternating current via the connection with a frequency between 1 kHz and 100 kHz has an impedance which is smaller in magnitude than 10 V / A, in particular smaller than 1 V / A, preferably less than 0, 1 V / A, and whose amount, in particular over a frequency range of 1 kHz to 100 kHz by a maximum of 100%, in particular a maximum of 40%, preferably at most 10%, preferably at most 3%, fluctuates ,
  • induction heating element is to be understood in particular as meaning a heating element having at least one induction heating line, which is intended to pass through
  • Magnetization effects in a, preferably ferromagnetic, in particular metallic, heating means, in particular in a cooking utensil, in an oven wall and / or in a radiator, which is arranged in an oven to cause heating of the heating means.
  • the induction heating element is provided to transmit in at least one operating mode in which the induction heating is connected to a supply electronics, a power of at least 100 W, in particular at least 500 W, advantageously at least 1000 W, preferably at least 2000 W, in particular electrical energy in electromagnetic
  • an "induction heating line” is to be understood as meaning, in particular, an electrical line which is intended to carry an electric current which is intended to induce induction effects in a suitable heating means , Preferably at least substantially in the form of a circular disc, alternatively in the form of an oval or a rectangle formed.
  • the induction heating in particular with a coupled heating means, an inductance of at least 0, 1 ⁇ , in particular at least 0.3 ⁇ , advantageously at least 1 ⁇ , on.
  • the induction heating line in particular, the induction heating line,
  • the induction heating is intended, at least in an operating state of high-frequency alternating current, in particular an alternating current having a frequency of at least 1 kHz, in particular at least 3 kHz, advantageously at least 10 kHz, preferably at least 20 kHz, in particular at most 100 kHz, in particular with a current intensity of at least 0.5 A, in particular at least 1 A, advantageously at least 3 A, preferably at least 10 A, to flow through.
  • a "control unit” is to be understood as meaning, in particular, an electronic unit which preferably has, in a control and / or regulating unit, an induction heating device
  • Household appliance is at least partially integrated.
  • the control unit is at least provided to control and / or regulate the switching elements.
  • 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.
  • At least one switch-on time, one duration and / or one switch-off time of a control in particular a phase and / or a duty cycle of a regular, preferably at least substantially periodic, control, be understood.
  • the induction heating device has at least one
  • control unit determines the activity parameters.
  • a heating behavior adapted to operating values can be achieved.
  • a duration that can be heated with maximum heating power before an emergency regulation due to overheating of the switching elements takes place can be extended.
  • the at least two switching elements are connected in parallel independently of the operating state.
  • the at least two switching elements are connected in parallel independently of the operating state.
  • Switching elements are provided, for example, to a boost mode, to be connected in parallel via a further, in particular electromechanical, switching element, in particular a relay.
  • a further, in particular electromechanical, switching element in particular a relay.
  • control unit is provided, at least in the operating mode at least two of the switching elements with different
  • a duty cycle of 100% corresponds to a constantly established connection, while a duty cycle of 0% corresponds to a constantly disconnected connection. It can in particular a
  • RMS value can be adjusted by flowing through the different switching elements currents, which in particular line losses of different
  • control unit be provided to activate the at least two switching elements at least substantially simultaneously, at least in the operating mode. Activate under "essentially simultaneously"
  • Control currents for the different switching elements at most 1 s, preferably at most 0, 1 s, preferably at most 10 ns, is.
  • a sampling rate for the correspondingly switched off switching element is selected in such a way that a current through the switching element is zero before the correspondingly different one
  • Switching element is turned off.
  • high efficiency can be achieved.
  • Switching element which is turned off earlier, be avoided.
  • the control unit is provided to switch off the switching elements at least substantially simultaneously, whereby an allocation of the switching losses is achieved, but line losses are redistributed.
  • the induction heater be at least one
  • a "current sensor” is intended in particular to mean a sensor, in particular a
  • Ammeter understood which measures at least the AC component, in particular by inductive means.
  • at least one current sensor is provided which measures the total current flowing through all the switching elements.
  • a loss performance determination of the line losses can be carried out for each of the switching elements.
  • the control unit is provided to determine the activity parameters of the at least two switching elements as a function of values of the current sensor arrangement.
  • the control unit is provided to equalize rms values of the currents through different ones of the at least two switching elements, by adjusting the sampling rate of a switching element with a high rms value
  • control unit is provided to adjust the activity parameters when a minimum effective value of the at least two switching elements is less than 100%, in particular less than 80%, advantageously none is 60%, preferably less than 40% of a maximum
  • the control unit is provided to adjust the activity parameters when a minimum effective value of the at least two switching elements is at most 20%; in particular at most 40%, advantageously at most 60%, preferably at most 80%, of a maximum effective value of the at least two switching elements.
  • a minimum effective value of the at least two switching elements is at most 20%; in particular at most 40%, advantageously at most 60%, preferably at most 80%, of a maximum effective value of the at least two switching elements.
  • the induction heater at least one of
  • Temperature sensor arrangement which is intended to determine temperatures of the at least two switching elements.
  • Temperature sensor arrangement on at least two temperature sensors, which are arranged on at least one, in particular divided by the switching elements, the heat sink, wherein the control unit is provided, based on measured values of these
  • Temperature sensors to determine temperatures of the switching elements to determine temperatures of the switching elements.
  • at least one, in particular a plurality, preferably each, of the switching elements has an integrated temperature sensor.
  • a temperature monitoring of the switching elements can be achieved.
  • control unit is provided to adjust the activity parameters of the at least two switching elements as a function of values of the To determine temperature sensor arrangement.
  • control unit is provided to adjust the activity parameters when a temperature of at least one of the switching elements exceeds a temperature of 160 ° C, in particular of 150 ° C, advantageously of 140 ° C.
  • control unit is provided to the
  • regulation of the activity parameters as a function of values of the temperature sensor arrangement takes precedence over regulation of the activity parameters as a function of values of the current sensor arrangement.
  • FIG. 1 shows a hob according to the invention in a schematic view
  • FIG. 2 shows an induction heating device according to the invention in one
  • FIG. 3 shows a first operating state of a first output operating mode
  • FIG. 4 shows a first operating mode according to the invention in response to
  • FIG. 5 shows a second operating state of the first output operating mode
  • FIG. 6 shows a second operating mode according to the invention in response to
  • Fig. 7 shows a temperature and power curve of an inventive
  • FIG. 1 shows a domestic appliance 10 designed as an induction hob, with a domestic appliance 10
  • Induction heater 12 has four induction heating elements 20, 22, 24, 26.
  • the induction heating elements 20, 22, 24, 26 are arranged under a hob plate 18.
  • FIG. 2 shows an embodiment of the induction heating device 12 in an exemplary circuit of the induction heating element 20.
  • the induction heating device 12 has a voltage source 30. Furthermore, the induction heater 12 has four
  • Switching elements 42, 44, 46, 48 on.
  • the switching elements 42, 44, and 46, 48 are connected in parallel to each other in pairs, independently of an operating mode.
  • Switching elements 42, 44, 46, 48 are part of an inverter 40.
  • the switching elements 42, 44, 46, 48 are designed as IGBTs.
  • the inverter 40 and the switching elements 42, 44, 46, 48 are provided to generate a high-frequency alternating current for supplying the induction heating element 20.
  • the inverter 40 is connected to the
  • Voltage source 30 is connected and draws over this energy to the
  • the voltage source 30 includes, but is not limited to, a rectifier, filter electronics, and buffering capacity, and further, the induction heating device 12 includes a control unit 14, which is provided to drive the switching elements 42, 44, 46, 48.
  • the control unit 14 is provided to the switching elements 42, 44, 46, 48 for generating the
  • the control unit 14 is provided, in operating modes in which operating parameters of the parallel-connected switching elements 42, 44, and 46, 48 differ from each other, the parallel-connected switching elements 42, 44, and 46, 48 with different activity parameters
  • control unit 14 is intended to be in such a
  • control unit 14 is provided to activate the parallel-connected switching elements 42, 44, and 46, 48 at the same time in such an operating mode.
  • the control unit 14 is provided to the
  • the induction heating element 20 is connected in a half-bridge circuit with resonance.
  • the induction heating element 20 is schematically represented here by a series connection of an inductance and a resistance corresponding to a load. Alternatively, it is conceivable that an induction heating element is connected in full bridge circuit or in one-switch topology.
  • the induction heater 12 further includes a heat sink 16 which is arranged to dissipate heat generated by the switching elements 42, 44, 46, 48 during operation.
  • the induction heating device 12 has a temperature sensor arrangement 50.
  • the temperature sensor arrangement 50 has four temperature sensors 52, 54, 56, 58, which are provided to measure temperatures of the heat sink 16 at different positions.
  • the control unit 14 is intended to be made of values of
  • Temperature sensor assembly 50 temperatures ⁇ 42 , ⁇ 44 , ⁇ 46 , ⁇ 48 of the switching elements 42, 44, 46, 48 to calculate. Further, the induction heater 12 has a
  • the current sensor arrangement 60 has four current sensors 62, 64, 66, 68.
  • the current sensors 62, 64, 66, 68 are each connected in series in a parallel branch of the switching elements 42, 44, 46, 48 to the respective switching element 42, 44, 46, 48.
  • the current sensor arrangement 60 is provided for measuring currents l 4 2, l 44 , l 4 6i Ue flowing through the switching elements 42, 44, 46, 48.
  • FIG. 3 illustrated by way of example on the switching elements 42, 44, schematic profiles of different operating variables over an activity period during a switching period of a first initial operating mode of the switching elements 42, 44 as a function of time t are shown. In the first operating mode, the
  • Switching elements 42, 44 simultaneously and with the same frequency turned on and off again later. They have the same phase and the same duty cycle.
  • the upper two graphs show a profile of a voltage U 2 o and a current l 20 of the induction heating element 20.
  • the third and fourth graph or the seventh and eighth graph show curves of voltages U 42 , U 44 and of currents l 42 , l 44 of the
  • Switching elements 42, 44 The fifth and ninth graph from above show switching states S 42 , S 44 of the switching elements 42, 44, wherein a value not equal to zero is turned on
  • the switching elements 42, 44 are switched on at a time t- ⁇ simultaneously and switched off at a time t 2 simultaneously.
  • the sixth and tenth graphs each show a course of a power loss P 42 , P 44 through
  • the control unit 14 is provided to the activity parameters of the switching elements 42, 44, 46, 48 as a function of values the temperature sensor assembly 50 to determine.
  • the control unit 14 is intended to adjust the activity parameters of a switching element 42, 44 whose temperature ⁇ 42 , ⁇ 44 exceeds a limit temperature.
  • the limit temperature is 135 ° C.
  • the control unit 14 is provided, for example, to adjust the activity parameters of the switching element 44 when its temperature ⁇ 44 exceeds the limit temperature in order to avoid switching losses in the switching element 44 having an elevated temperature ⁇ 44 . Furthermore, thereby an effective value l eff44 of the current I 44 of the switching element 44 and thus line losses are reduced.
  • the control unit 14 is provided to reduce a duty cycle of the switching element 44 and thus turn off earlier than the parallel switching element 42.
  • FIG. 4 shows by way of example schematic profiles of the various operating variables over an activity period during a switching period of an operating mode which is used in response to the overheating of the switching element 44.
  • the switching elements 42, 44 are turned on simultaneously and at the same frequency.
  • the switching elements 42, 44 are turned on at a time t- ⁇ simultaneously.
  • the switching element 44 is switched off prematurely.
  • the control unit 14 controls the time t 2 'of the shutdown so that a current I 44 of the switching element 44 reaches zero before the parallel-connected switching element 42 is turned off at a regular time t 2 .
  • the switching element 44 the current l 42 of the parallel-connected switching element 42 increases to compensate for the premature shutdown.
  • the switching element 42 carries at
  • Switching element 44 on, the time t 2 'of switching off by lowering the clock ratio can be further preferred.
  • FIG. 5 again shows graphs of the first operating mode in an alternative case.
  • this alternative case there is an effective value l eff42 of the current I 42 , for example, by an increased resistance of the switching element 42, lower than an effective value l eff44 of the current l 44th This results for the switching element 44 connected in parallel, a higher power loss P 44 by switching losses and increased line losses.
  • the control unit 14 is provided to determine the activity parameters of the switching elements 42, 44, 46, 48 in dependence on values of the current sensor arrangement 60.
  • the control unit 14 is provided to adjust the activity parameters when the rms values leff42 , ff44 of the switching elements 42, 44 differ by more than 50%.
  • the control unit 14 is provided to shorten the duty cycle of the switching element 44 with the higher effective value l eff44 of the current I 44 .
  • FIG. 6 shows the graphs achieved by the adaptation of the activity parameters.
  • the switching element 44 with the formerly higher rms value leff44 is prematurely switched off at the time t 2 ".
  • the switching element 42 connected in parallel with the formerly low rms value l eff42 has an increased current l 42 from the instant t 2 " onwards in order to switch off the premature switch off other switching element 44 to compensate.
  • the control unit 14 is provided to select the time t 2 "of the shutdown so that an effective value l eff42 'and an effective value l eff44 ' less than 20%
  • FIG. 7 shows a time profile of a power P 20 of the induction heating element 20, of rms values l eff42 , l eff44 of currents l 42 , l 44 through the switching elements 42, 44 and of temperatures ⁇ 42 , ⁇ 44 of the switching elements 42, 44 , from the beginning of one
  • Heating with high power P 20 on until after reducing the power P 20 due to overheating begins at room temperature, the temperatures ⁇ 42 , ⁇ 44 of the switching elements 42, 44 continue to increase, until a time t 10, a first of the
  • Switching elements 42 reaches the limit temperature. Rather than now reducing the power P 20 to reduce power dissipation of the switching elements 42, 44 and prevent further increase in temperature, the inventive method is used to reduce the power dissipation across the first of the switching elements 42 and to keep the power P 20 constant ,
  • the control unit 14 is intended to be the same between the different operating modes, the operating mode
  • Duty ratios conceivable to achieve a fine-tuning of the power losses.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Induction Heating Cooking Devices (AREA)

Abstract

L'invention concerne un dispositif de chauffe par induction (12), en particulier un dispositif de plaque de cuisson à induction, comportant au moins deux éléments de commutation (42, 44, 46, 48) qui sont montés en parallèle dans au moins un mode de fonctionnement et conçus pour produire un courant alternatif haute fréquence pour alimenter un élément de chauffe par induction (20, 22, 24, 26), et au moins une unité de commande (14). Afin d'obtenir un comportement de chauffe amélioré, l'unité de commande (14) commande au moins deux des éléments de commutation (42, 44, 46, 48) à l'aide de paramètres d'activité différents au moins dans le premier mode de fonctionnement.
PCT/IB2012/056816 2011-12-07 2012-11-29 Dispositif de chauffe par induction WO2013084115A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12815792.2A EP2789208B1 (fr) 2011-12-07 2012-11-29 Dispositif de chauffe par induction

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ESP201131981 2011-12-07
ES201131981 2011-12-07

Publications (1)

Publication Number Publication Date
WO2013084115A1 true WO2013084115A1 (fr) 2013-06-13

Family

ID=47559590

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2012/056816 WO2013084115A1 (fr) 2011-12-07 2012-11-29 Dispositif de chauffe par induction

Country Status (2)

Country Link
EP (1) EP2789208B1 (fr)
WO (1) WO2013084115A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0888033A1 (fr) * 1996-03-13 1998-12-30 Matsushita Electric Industrial Co., Ltd. Onduleur a haute frequence et dispositif de cuisson l'utilisant
JP2006114320A (ja) * 2004-10-14 2006-04-27 Mitsubishi Electric Corp 誘導加熱装置及び誘導加熱調理器
EP1679938A1 (fr) * 2003-10-30 2006-07-12 Matsushita Electric Industrial Co., Ltd. Dispositif de cuisson a chauffage par induction
EP1978786A1 (fr) * 2006-02-02 2008-10-08 Matsushita Electric Industrial Co., Ltd. Appareil de chauffage par induction

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0888033A1 (fr) * 1996-03-13 1998-12-30 Matsushita Electric Industrial Co., Ltd. Onduleur a haute frequence et dispositif de cuisson l'utilisant
EP1679938A1 (fr) * 2003-10-30 2006-07-12 Matsushita Electric Industrial Co., Ltd. Dispositif de cuisson a chauffage par induction
JP2006114320A (ja) * 2004-10-14 2006-04-27 Mitsubishi Electric Corp 誘導加熱装置及び誘導加熱調理器
EP1978786A1 (fr) * 2006-02-02 2008-10-08 Matsushita Electric Industrial Co., Ltd. Appareil de chauffage par induction

Also Published As

Publication number Publication date
EP2789208B1 (fr) 2016-02-03
EP2789208A1 (fr) 2014-10-15

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