EP1625774A1 - Regulation de temperature destinee a un element de chauffage chauffe par induction - Google Patents

Regulation de temperature destinee a un element de chauffage chauffe par induction

Info

Publication number
EP1625774A1
EP1625774A1 EP03816956A EP03816956A EP1625774A1 EP 1625774 A1 EP1625774 A1 EP 1625774A1 EP 03816956 A EP03816956 A EP 03816956A EP 03816956 A EP03816956 A EP 03816956A EP 1625774 A1 EP1625774 A1 EP 1625774A1
Authority
EP
European Patent Office
Prior art keywords
control circuit
heating element
temperature
control
value
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
EP03816956A
Other languages
German (de)
English (en)
Other versions
EP1625774B1 (fr
EP1625774B2 (fr
Inventor
José Miguel Emilia Pardo BURDIO PINILLA
Pablo Jesús HERNANDEZ BLASCO
Sergio C/La Plaza 1 LLORENTE GIL
Fernando Monterde Aznar
José Ramón GARCIA JIMENEZ
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=33443031&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1625774(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by BSH Bosch und Siemens Hausgeraete GmbH filed Critical BSH Bosch und Siemens Hausgeraete GmbH
Publication of EP1625774A1 publication Critical patent/EP1625774A1/fr
Publication of EP1625774B1 publication Critical patent/EP1625774B1/fr
Application granted granted Critical
Publication of EP1625774B2 publication Critical patent/EP1625774B2/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • 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
    • H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
    • H05B6/065—Control, e.g. of temperature, of power for cooking plates or the like using coordinated control of multiple induction coils
    • 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
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/12—Cooking devices
    • H05B6/129—Cooking devices induction ovens
    • 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 a method for temperature control of a heating element, which is heated inductively by an inductor, to which electrical power is supplied via a control circuit and a corresponding control circuit, as well as an induction hob and an induction oven with such a control circuit.
  • the heating of a heating element by induction is known.
  • This principle is e.g. used in induction hobs, in which the heat of a cooking vessel is generated in the bottom of it by induction.
  • a method for measuring and regulating the temperature of an inductively heated cooking vessel in an induction cooking device is known.
  • This method measures a parameter of a circuit that supplies the inductor with electrical power.
  • Parameter is influenced by the heating of the cooking vessel, so that its value varies with a change in the temperature of the cooking vessel.
  • the temperature of the cooking vessel can be determined from the measured value of the parameter using a temperature characteristic of the parameter.
  • the invention has for its object to provide a method for temperature control of an inductively heated heating element, which works independently of the state of the heating element and for different heating elements.
  • This object is achieved by a method of the type mentioned at the outset in that the temperature control is activated at a first point in time, that depending on at least one electrical variable of the control circuit, which depends on the temperature of the heating element, a reference value or a at this first point in time Desired value is determined that, depending on the electrical quantity, a comparison value or an actual value and a deviation of this comparison value from the reference value is determined at least at a later point in time, and that power is supplied to the inductor depending on the deviation, so that the temperature of the heating element is regulated to a constant value corresponding to the reference value.
  • control circuit of the type mentioned in the introduction in that the control circuit comprises an operating element for activating the temperature control, in that the control circuit has at least one measuring device for determining at least one electrical variable of the control circuit, which depends on the temperature of the heating element, includes that the control circuit is designed to determine a reference value dependent on the electrical variable at an activation time of the temperature control and to determine a comparison value dependent on the electrical variable at least at a later point in time, that the control circuit is a comparison unit for determining a deviation of the comparison value from the Includes reference value, and that the control circuit comprises a control unit for controlling the power regulator depending on the deviation, for temperature control of the heating element to a reference value t corresponding constant value.
  • the reference value is determined at the time of activation of the temperature control depending on the electrical variable of the control circuit and this is compared with the comparison value which is determined at least at a later point in time depending on the electrical variable of the control circuit is ensured in a simple manner. that the temperature control to a temperature corresponding to the reference value is independent of the choice of the heating element. It is also advantageous that the temperature of the heating element can thus be regulated without knowledge of a specific temperature characteristic of the electrical quantity for the heating element. In this way, the temperature control is functional even if the heating element is positioned inaccurately to the inductor.
  • the temperature control can be activated by a user by actuating an operating element, which is in particular at least one switch or at least one touch sensor.
  • an operating element which is in particular at least one switch or at least one touch sensor.
  • This allows the user to determine the desired temperature of the heating element by activating the temperature control, for example in an induction cooking zone of an induction hob, when water in a cooking vessel starts to boil on this induction cooking zone or a food in the cooking vessel on one that is subjectively determined by the user Temperature should be kept.
  • the temperature of the heating element such as the cooking vessel, is maintained after activation of the temperature control, without having to determine the absolute temperature of the heating element with a sensor.
  • the electrical power is automatically regulated in order to keep the temperature of the heating element at the temperature corresponding to the reference value and manual readjustment of the electrical power by the user is also not necessary if, for example, cold food is still fed into the cooking vessel during a cooking process.
  • the comparison value of the electrical variable can advantageously be determined at predetermined, in particular periodic, time intervals. In this way the accuracy of the temperature control is increased, since changes in the temperature of the heating element by e.g. external influences are recorded at regular intervals and the electrical power supplied to the inductor is adjusted accordingly in order to keep the temperature constant.
  • the reference value and / or the comparison value are determined at a predetermined frequency of the electrical variable. This procedure has the advantage that frequency-dependent influences of the heating element or the determination of the reference value or the comparison value can be avoided, as a result of which the accuracy of the temperature control can be increased.
  • FIG. 1 shows a schematic representation of an induction hob with a control circuit for temperature regulation
  • 3c shows a schematic time course of an output voltage and an output current of the control circuit
  • FIG. 6 shows a schematic illustration of an induction furnace with temperature control
  • the induction hob 1 shows an induction hob 1 with a control circuit 2 for regulating the temperature of a cooking vessel 3.
  • the induction hob 1 has a glass ceramic plate 4 with four induction cooking zones 5, at the position of which there is one inductor 6 each under the glass ceramic plate.
  • the cooking vessel 3 is heated by one of the inductors 6.
  • To operate the inductors 6 is on a front 7 Glass ceramic plate an operating unit 8 is arranged.
  • This control unit 8 comprises control elements 9 for activating and deactivating the temperature control.
  • control circuit 2 includes the inductor 6 for inductive
  • Control circuit 2 an operating element 9 for activating and deactivating the temperature control and a control unit 12, such as a microprocessor, for controlling the power regulator 10.
  • the control circuit 2 is supplied with an input voltage v t by a voltage source 13, which is an AC voltage.
  • the power regulator 10 usually comprises a converter (not shown) which converts the input voltage v into an input frequency of, for example, 50 Hz
  • a rotary selector of the control unit 8 e.g. a periodic arrival and departure
  • the temperature control is activated by the control element 9 by a control signal S ⁇ to the control unit 12.
  • the electrical variables v 0 , i 0 , P, I of the control circuit 2 detected by the measuring device 11 are fed to the control unit 12 and processed there to form a control signal for the power control S. Because of the control signal for the
  • Power control S P which is supplied to the power controller 10, regulates the electrical power P supplied to the inductor 6 and thus a thermal power W generated in the heating element 3.
  • FIG. 3a A detailed sketch of the control circuit 2 is shown in FIG. 3a.
  • the control circuit 2 is supplied with the input voltage v i via the voltage source 13. The height of this
  • Input voltage v t is generated using a voltage divider 14, which has two resistors Kl,
  • R2 comprises, reduced and by means of a rectifier 15 to a rectified. Input voltage v, converted.
  • the positions of voltage maxima V m in a time profile of the rectified input voltage v r are detected with a peak detector 16 and downstream of a high-voltage insulation 17, a value of the voltage maxima V m is recorded.
  • FIG. 3b shows the course of the input voltage v t and the course of the rectified input voltage v r over a time axis t.
  • the value of the voltage maxima V m is marked in the course of the rectified input voltage v r .
  • the electrical power P fed to the inductor 6 is regulated by the power regulator 10 with the aid of two high-frequency switches S1, S2, which can be power semiconductor components, for example.
  • An output voltage v 0 is present at the inductor and an output current i 0 flows .
  • These two electrical variables v 0 , i 0 are influenced by a change in resistance of the heating element 3, which depends on the heating element 3 and its temperature T.
  • the output current i 0 is detected with the aid of a current-voltage converter 18, at the resistor R3 of which a voltage vi is applied which is proportional to the output current i 0 . is.
  • FIG. 3c schematically shows the detected time profile of the output voltage v 0 and the output current i 0 .
  • a further, alternative measured variable, which depends on the temperature T of the heating element 3, is, for example, a phase shift ⁇ t between the output voltage v 0 and
  • Output current i 0 which can be determined, for example, on the basis of a zero crossing Nl of the output voltage v 0 and a zero crossing N2 of the output current i 0 .
  • Other electrical variables of the control circuit 2 can also be measured, which depend on the temperature T of the heating element 3, such as, for example, an average electrical power P, an average rectified current /, a maximum current I max or a frequency of the output voltage v 0 or Output current i 0 .
  • the average electrical power P can be determined from the product of output voltage v 0 and output current i 0 ? X ⁇ . i mein ⁇ dt ⁇ o where ⁇ indicates an averaging period.
  • the averaged rectified current / is according to
  • V ms denotes the root of the root mean square of the input voltage v ( .
  • Other functions F are also possible, for example the function F can also be an impedance of the heating element 3 and the inductor 6, which is based on a ratio of the mean power P to a square of the averaged current / is determined.
  • FIG. 4 shows a flow chart of the temperature control of the heating element 3.
  • the temperature control is carried out by a control signal
  • a reference value F R is determined almost simultaneously with the activation of the temperature control from the current value of the function F, which is dependent on at least one of the electrical variables, v 0 , i, P, / of the control circuit 2, which of the temperature T of the heating element 3 depends.
  • a comparison value F v from the function F and a deviation of this comparison value F v from the reference value F R are determined depending on the electrical variable v 0 , i 0 , P, I.
  • Method step TR supplies the inductor 6 with electrical power P as a function of the deviation, so that the temperature T of the heating element 3 is regulated to a constant value corresponding to the reference value F R.
  • a next method step DA it is checked whether there is a signal S ⁇ for deactivating the temperature control. If this is not the case N, the method step VW is continued. If there is a signal S ⁇ for deactivating the temperature control before Y, the temperature control is ended in the next method step TE and power control L of the electrical power P is carried out without temperature control with the power controller 10 in accordance with the power P selected by the control unit 8.
  • a time course of the temperature control is shown schematically in FIG.
  • the inductor 6 is activated with the heating element 3 and the inductor 6 is thus supplied with an electrical power Pl selected by the control unit 8, which is controlled by the power controller 10 and heats the heating element 3 to a temperature 71.
  • the user activates the temperature control by actuating the control element 9, which is, for example, a switch or a touch sensor.
  • the reference value F R and at later times t2 to t7, which are advantageously at periodic time intervals, the comparison value F v is determined.
  • the frequency of the output voltage v 0 or the output current i 0 is regulated to a predetermined value and the power control L of the power regulator 10 is interrupted. Since the averaging period t is typically of the order of 10 to 800 milliseconds, this period of time is negligibly small compared to the typical duration d of the power control L of 5 to 15 seconds. As soon as the temperature control is activated, the electrical power supplied to the inductor 6 is reduced from the power value Pl to a lower power value P2 in order to keep the temperature value T1 of the heating element 3 constant.
  • the heating element 3 is cooled by an external influence, for example by supplying cold liquid to a cooking vessel 3.
  • This cooling of the heating element 3 to a temperature value Tl is detected by the deviation of the comparison value F v from the reference value F R.
  • the temperature control then causes the electrical power supplied to the inductor 6 to be increased to a value P3 in order to heat the heating element 3 again to the temperature T1.
  • the electrical power P supplied to the inductor 6 can be gradually reduced to a value P4.
  • This power value P4 is now fed to the inductor 6 in order to keep the heating element 3 at the constant temperature value T1.
  • the temperature control remains active until it is deactivated, for example by the user actuating the control element 9.
  • Another possibility of deactivating the temperature control is, for example, removing the heating element 3 from the inductor 6, deactivating the inductor 6 by the user or another power specification for the inductor 6 via the control unit 8.
  • An induction furnace 19 is shown schematically in FIG. 6 as a further application example for the temperature control of the inductively heated heating element 3.
  • Induction furnace is located, the control element 9 for activating and deactivating the temperature control.
  • a loading opening 21 of the induction furnace 19 is through
  • the inductors 6 are located, for example, on the top wall 23 and on the bottom wall 24 of the induction furnace 19 and are covered by the heating elements 3.
  • the inductors 6 and the heating elements 3 can also be attached to the side walls 22. Alternatively, it can
  • Heating element 3 also a food support, such as being a baking sheet, or one of the side walls 22, the top wall 23 or the bottom wall 24. LIST OF REFERENCE NUMBERS
  • Control unit 9 Control element for activating / deactivating the temperature control
  • control unit microprocessor

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Induction Heating (AREA)
  • Control Of Temperature (AREA)
  • Control Of Resistance Heating (AREA)
  • Resistance Heating (AREA)
EP03816956A 2003-05-15 2003-10-28 Regulation de temperature destinee a un element de chauffage chauffe par induction Expired - Lifetime EP1625774B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES200301242A ES2246640B1 (es) 2003-05-15 2003-05-15 Regulacion de la temperatura para un elemento calentador de calentamiento inducido.
PCT/EP2003/011961 WO2004103028A1 (fr) 2003-05-15 2003-10-28 Regulation de temperature destinee a un element de chauffage chauffe par induction

Publications (3)

Publication Number Publication Date
EP1625774A1 true EP1625774A1 (fr) 2006-02-15
EP1625774B1 EP1625774B1 (fr) 2007-09-26
EP1625774B2 EP1625774B2 (fr) 2011-08-17

Family

ID=33443031

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03816956A Expired - Lifetime EP1625774B2 (fr) 2003-05-15 2003-10-28 Regulation de temperature destinee a un element de chauffage chauffe par induction

Country Status (7)

Country Link
US (1) US7692121B2 (fr)
EP (1) EP1625774B2 (fr)
AT (1) ATE374515T1 (fr)
AU (1) AU2003276195A1 (fr)
DE (1) DE50308299D1 (fr)
ES (2) ES2246640B1 (fr)
WO (1) WO2004103028A1 (fr)

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ES2246640B1 (es) 2003-05-15 2006-11-01 Bsh Electrodomesticos España, S.A. Regulacion de la temperatura para un elemento calentador de calentamiento inducido.
ES2289872B1 (es) * 2005-06-08 2008-09-16 Bsh Electrodomesticos España, S.A. Dispositivo para calentamiento inductivo de un elemento calentador.
ES2310960B1 (es) * 2006-11-08 2009-11-05 Bsh Electrodomesticos España S.A. Circuito de dispositivo de calentamiento.
JP5100754B2 (ja) * 2007-09-21 2012-12-19 九州電力株式会社 給電装置
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EP2209352B1 (fr) * 2009-01-16 2018-10-03 Whirlpool Corporation Chauffage de cuisson par induction et son procédé de commande
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KR20130073477A (ko) * 2011-12-23 2013-07-03 삼성전자주식회사 유도가열조리기 및 그 제어방법
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WO2013136577A1 (fr) * 2012-03-14 2013-09-19 三菱電機株式会社 Cuisinière à induction
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KR101981671B1 (ko) * 2012-07-27 2019-05-24 삼성전자주식회사 유도가열조리기 및 그 제어방법
WO2014068648A1 (fr) * 2012-10-30 2014-05-08 三菱電機株式会社 Cuisinière à induction
TW201434067A (zh) * 2013-02-20 2014-09-01 Delta Electronics Inc 具有應變規之開關控制模組及其所適用之電器裝置
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JP7008044B2 (ja) 2016-07-01 2022-01-25 株式会社ミツトヨ 座標測定機のための取り外し可能なプローブに電力を供給するための電力伝達構成体
EP3560279B1 (fr) * 2016-12-23 2023-06-07 BSH Hausgeräte GmbH Dispositif pour appareil de cuisson
CN111385922B (zh) * 2018-12-29 2022-04-01 佛山市顺德区美的电热电器制造有限公司 电磁加热器具的控制方法、装置及电磁加热器具
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Also Published As

Publication number Publication date
ATE374515T1 (de) 2007-10-15
ES2294371T3 (es) 2008-04-01
ES2246640B1 (es) 2006-11-01
EP1625774B1 (fr) 2007-09-26
ES2294371T5 (es) 2011-11-29
DE50308299D1 (de) 2007-11-08
ES2246640A1 (es) 2006-02-16
US7692121B2 (en) 2010-04-06
WO2004103028A1 (fr) 2004-11-25
EP1625774B2 (fr) 2011-08-17
AU2003276195A1 (en) 2004-12-03
US20080121633A1 (en) 2008-05-29

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