EP2497332A1 - Kochfeld mit wenigstens zwei heizinduktoren - Google Patents
Kochfeld mit wenigstens zwei heizinduktorenInfo
- Publication number
- EP2497332A1 EP2497332A1 EP10778726A EP10778726A EP2497332A1 EP 2497332 A1 EP2497332 A1 EP 2497332A1 EP 10778726 A EP10778726 A EP 10778726A EP 10778726 A EP10778726 A EP 10778726A EP 2497332 A1 EP2497332 A1 EP 2497332A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- heating
- resonant circuit
- inductors
- inverters
- heating inductors
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 103
- 239000003990 capacitor Substances 0.000 claims abstract description 48
- 238000000034 method Methods 0.000 claims description 12
- 230000010363 phase shift Effects 0.000 claims description 8
- 239000004065 semiconductor Substances 0.000 description 6
- 238000011217 control strategy Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 238000013016 damping Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- IYLGZMTXKJYONK-ACLXAEORSA-N (12s,15r)-15-hydroxy-11,16-dioxo-15,20-dihydrosenecionan-12-yl acetate Chemical compound O1C(=O)[C@](CC)(O)C[C@@H](C)[C@](C)(OC(C)=O)C(=O)OCC2=CCN3[C@H]2[C@H]1CC3 IYLGZMTXKJYONK-ACLXAEORSA-N 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- IYLGZMTXKJYONK-UHFFFAOYSA-N ruwenine Natural products O1C(=O)C(CC)(O)CC(C)C(C)(OC(C)=O)C(=O)OCC2=CCN3C2C1CC3 IYLGZMTXKJYONK-UHFFFAOYSA-N 0.000 description 1
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
- 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
- H05B6/06—Control, e.g. of temperature, of power
Definitions
- the invention relates to a hob with at least two heating inductors according to the preamble of claim 1 and a method for operating such a hob according to the preamble of claim 10.
- a cooktop with two heating inductors is known, which are each connected in series with a separate resonant circuit capacitor.
- an independent oscillating circuit is usually formed for each induction heater to be operated.
- the frequencies and / or amplitudes of the heating currents for the respective induction heaters can be selected independently of each other in a simple manner to adjust the heating powers independently.
- adjacent heating inductors are operated with heating currents of the same frequency.
- the heating elements are partially operated in a time-multiplex method. In this time-multiplexing method, different frequencies can then be selected in different, periodically repeating time windows.
- this method is complicated and can lead to problems with flicker due to voltage jumps when switching between the time windows.
- the invention is in particular the object of providing a low-cost cooktop and a method for operating such a cooktop.
- the object is achieved in particular by a hob with the features of independent claim 1 and by a method having the features of independent claim 10. Further advantageous embodiments and further developments of the invention emerge from the subclaims.
- the invention is based on a hob with at least two heating inductors, which are each connected to at least one resonant circuit capacitor in series with a resonant circuit. It is in particular proposed that at least one common resonant circuit capacitor is connected in series with both heating inductors.
- the number of resonant circuit capacitors can be reduced and a novel control strategy for controlling the cooktop can be implemented, which avoids time-division multiplexing methods for independently setting the heating powers of the various heating inductors.
- hum through interference between independent oscillators and problems with flicker can be avoided.
- a resonant circuit capacitor is a capacitor connected in series with a heating inductor, which capacitor is arranged in a series resonant circuit.
- the connection between the resonant circuit capacitor and the heating inductor may be a hard-wired connection.
- the series resonant circuit is supplied by an inverter with high-frequency heating current.
- the frequency of the heating current determines the heating power of the heating inductor, which generates high frequency alternating magnetic fields.
- the alternating magnetic fields generate eddy currents in the bottom of a cookware element placed on the hob, which heat up this bottom.
- the hob comprises two inverters for supplying one of the heating inductors with a heating current.
- each of the heating inductors should be connected to the output of a separate inverter.
- the hob may be designed to operate the inverters with the same frequency in at least one operating mode, so that interference is avoided.
- the control unit can be designed to increase the ratio of the heating power of the two heating inductors to control an adjustment of a phase shift between the switching signals of the two inverters.
- the two Schumanktoren are therefore supplied with heating currents of the same frequency, but which may have a different phase position.
- the symmetry between the two each comprising a Walkerinduktor subsystems, which are coupled via the common resonant circuit capacitor is thereby broken, and there are heating currents with different amplitudes.
- the ratio of these amplitudes and thus the ratio of the heating powers is therefore dependent on the selected phase shift, which can be set by the control unit according to the wishes of the operator.
- the total heating power can thus be adjusted via the choice of the frequency of the heating current and the ratio of the heating power through the choice of the phase shift, so that overall the heating power of at least two Walkerinduktoren can be set independently of each other at least in a large range of values.
- control unit can control the ratio of the heating powers by setting pulse lengths of the heating current pulses generated by the inverters.
- a DC component in the heating current can be avoided in this case, if the pulse lengths of the two inverters are set to the same value and this value is selected at a given frequency depending on the desired ratio of the heating powers.
- the heating powers can be set depending on the specifications of the user without complex calculations when the hob comprises a memory unit for storing an at least two-dimensional map.
- the characteristic map stores the phase shift to be set and / or the pulse lengths as a function of the ratio of the heating powers to be applied and the total heating power of the two heating inductors.
- each of the two resonant circuit capacitor is connected to a pole of the power supply unit and the inverters each form a half-bridge circuit between the two poles, the electromagnetic emission properties of the hob can be improved.
- the resonant frequency of the resonant circuit or of the overall system can be changed if the common oscillator capacitor is part of a common oscillator circuit capacitor arrangement with a variable total capacitance.
- a common resonant circuit capacitor can be switched on or disconnected from the system.
- the inventive concept is readily generalizable to hobs with three or more heating inductors connected in series with one or more common capacitors to a resonant circuit.
- Another aspect of the invention relates to a method for operating a hob with at least two heating inductors, which are connected to at least one capacitor in series with a resonant circuit.
- the hob further includes two inverters for generating heating currents for the heating inductors.
- the common capacitor is connected in series with both heating inductors and that a ratio of the heating powers of the two heating inductors is controlled by adjusting a phase shift between the switching signals of the two inverters and / or by adjusting the pulse length of the heating currents for a given period ,
- Fig. 1 shows the schematic structure of a hob with two Schulengthen
- FIG. 3 shows a two-dimensional characteristic diagram of the ratio of the heating powers of two heating inductors of a cooking hob according to FIGS. 1 and 2
- FIG. 4 shows a two-dimensional characteristic diagram for determining a total heating power of the two heating inductors of a hob according to the invention
- Fig. 1 shows schematically the construction of an induction hob with two heating inductors 10a, 10b, which are each connected to the output of an inverter 12a, 12b.
- the inverters 12a, 12b are supplied with direct current by a power supply unit.
- the power supply unit includes a filter 14 and a rectifier 16.
- the filter 14 smoothes the 50 Hz AC voltage obtained from a phase 18 of a household power grid, which is converted by the rectifier 16 into a direct current.
- a respective damping capacitor 20a, 20b is arranged, which acts as a low-pass filter and prevents feedback of the high-frequency heating currents generated by the inverters 12a, 12b in the household power grid.
- the inverters 12a, 12b are arranged in a half-bridge circuit between the two poles of the rectified supply voltage.
- the inverters 12a, 12b each consist of a pair of IGBTs or MOSFETs with an antiparallel freewheeling diode and are operated to generate a high-frequency heating current with a frequency of typically 20 to 100 kHz.
- the control unit switches the two semiconductor switches of the inverters 12a, 12b alternately on and off.
- the control unit 22 can determine both the period T of the switching on and off as well as the relative duration of the switching on and off phases and thus their pulse length Pa, Pb independently.
- the outputs of the heating inductors 10a, 10b are brought together and connected to a common oscillating circuit capacitor arrangement 24, which comprises two resonant circuit capacitors 26a, 26b respectively connected to both heating inductors 10a, 10b.
- the resonant circuit capacitors 26a, 26b are connected in series with both heating inductors 10a, 10b and, on the other hand, each connected to one pole of the power supply unit comprising the filter 14 and the rectifier 16.
- the two resonant circuit capacitors 26a, 26b are equivalent to a common capacitor arranged in a connecting line 28, which would then have twice the capacity and whose capacitance together with the inductance of one of the heating inductors 10a, 10b would determine the resonant frequency of the resonant circuit.
- the illustration in FIG. 1 is particularly simplified insofar as the cooktop can also comprise more than two inductors, which can either be connected in pairs to common resonant circuit capacitor arrangements 24 or can also be assigned to a common oscillator circuit capacitor arrangement 24 in groups of three or more heating inductors.
- the control unit 22 transmits via control lines, not shown here, to the semiconductor switches of the inverters 12a, 12b.
- the upper curve Q1 in FIG. 2 corresponds to the signal of the upper switch of the upper inverter 12a in FIG. 1
- the second curve Q2 shows the switch signal of the lower switch of the upper inverter 12a
- the curves Q3 and Q4 show the switching signals of the two unipolar ones.
- the control unit 22 turns on and off each of the switches with a period T in turn.
- the period T and thus the frequency of the heating current generated by the inverters 12a, 12b is the same for both inverters 12a, 12b. This can not cause interference.
- the switching pulses are phase-shifted from one another by a delay d
- the control unit 22 can flexibly set the amplitudes of the heating currents flowing through the heating inductors 10a, 10b and thus determine the heating powers of the heating inductors 10a, 10b.
- FIG. 3 schematically shows a two-dimensional characteristic map, which is stored in the memory unit 30 of the control unit 22 and is used by the control unit 22 for determining the ratio of the heating powers.
- the map indicates the ratio of the heating power depending on the frequency of the heating current and the delay d, the latter being indicated as a fraction of the period T.
- the lines illustrated in FIG. 3 are lines with constant heating power ratio.
- FIG. 4 shows a further two-dimensional characteristic map from the memory unit 30, which indicates the total heating power of the heating inductors 10a, 10b as a function of the frequency and the proportion d / T of the delay d at the period T.
- Fig. 4 lines are also shown with constant total heat output.
- the dead times t1 to t4 correspond to the times in which the corresponding semiconductor switch is open, but the current flows in the freewheeling direction of the freewheeling diode arranged in antiparallel to this semiconductor switch.
- the semiconductor switches of the inverters 12a, 12b are usually opened during this phase in order to avoid switch-on losses. However, this is possible only in a certain parameter range, which lies outside the hatched area B shown hatched in FIGS. 3 and 4. Within this prohibited area B hard switching operations occur in which the current is interrupted abruptly and lead to switching losses.
- the control unit 22 first calculates the desired total heating power for a given target heating power of the heating inductors 10a, 10b and assigns them to one of the isolines with constant total heat output shown in FIG. Subsequently, the control unit 22 determines the ratio of the two desired heating powers of the heating inductors 10a, 10b and determines a corresponding isoline in the characteristic diagram in FIG. 3. The intersection of these two isolines is determined and its coordinates determined, in order to obtain the control unit 22 to be controlled frequency and the delay d to determine. Of course, this process can be carried out beforehand for all pairs of desired heat outputs, so that the frequency and the delay d can be determined directly from a respective map.
- the pulse lengths Pa, Pb are varied so as to determine the appropriate delay d for a given pulse length Pa, Pb for suitable heating frequencies.
- the memory unit 30 to maps for different ratios of pulse lengths Pa, Pb are stored.
- FIG. 5 shows a further alternative exemplary embodiment of the invention with a switchable resonant capacitor arrangement 24, which comprises a total of four resonant circuit capacitors 26a, 26b, 26c, 26d.
- the resonant circuit capacitors 26c, 26d can be switched on or off depending on the desired resonance frequency by means of a switch 32, whereby switching losses can be avoided and the forbidden region B can be shifted with high switching losses.
- resonant circuit capacitor arrangements 24 with continuously variable capacitors or with more than two different possible values of the total capacitance are also conceivable.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Induction Heating Cooking Devices (AREA)
- General Induction Heating (AREA)
- Inverter Devices (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES200930959A ES2378607B1 (es) | 2009-11-05 | 2009-11-05 | Campo de cocción con al menos dos inductores de calentamiento. |
PCT/IB2010/054907 WO2011055283A1 (de) | 2009-11-05 | 2010-10-29 | Kochfeld mit wenigstens zwei heizinduktoren |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2497332A1 true EP2497332A1 (de) | 2012-09-12 |
EP2497332B1 EP2497332B1 (de) | 2016-08-17 |
Family
ID=43432130
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10778726.9A Active EP2497332B1 (de) | 2009-11-05 | 2010-10-29 | Kochfeld mit wenigstens zwei heizinduktoren |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP2497332B1 (de) |
CN (1) | CN102598849B (de) |
ES (2) | ES2378607B1 (de) |
PL (1) | PL2497332T3 (de) |
WO (1) | WO2011055283A1 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2453714A1 (de) * | 2010-11-10 | 2012-05-16 | BSH Bosch und Siemens Hausgeräte GmbH | Induktionsheizvorrichtung |
CN103836682B (zh) * | 2012-11-26 | 2016-12-21 | 美的集团股份有限公司 | 一种具有多个灶头的电磁炉 |
CN103307646B (zh) * | 2013-05-14 | 2015-10-21 | 广东鼎燊科技有限公司 | 一种商用电磁灶卸载检测装置及方法 |
US10993292B2 (en) * | 2017-10-23 | 2021-04-27 | Whirlpool Corporation | System and method for tuning an induction circuit |
EP4074142A1 (de) * | 2019-12-13 | 2022-10-19 | BSH Hausgeräte GmbH | Induktionsvorrichtung |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4390769A (en) * | 1980-05-29 | 1983-06-28 | General Electric Company | Induction heating apparatus providing smooth power control |
IT1281843B1 (it) * | 1995-01-25 | 1998-03-03 | Meneghetti Ampelio & C S N C | Dispositivo di controllo particolarmente per fornelli ad induzione multipiastra |
ES2143430B1 (es) | 1998-09-08 | 2000-12-16 | Balay Sa | Circuito inversor de dos salidas, y circuito y procedimiento de control de la potencia entregada en las salidas del inversor. |
ES2265758B1 (es) * | 2005-03-01 | 2007-11-16 | Bsh Electrodomesticos España, S.A. | Dispositivo de calentamiento para una cocina de induccion. |
FR2902600B1 (fr) * | 2006-06-14 | 2008-09-05 | Brandt Ind Sas | Systeme a induction, procede d'alimentation d'un inducteur et table de cuisson comportant un tel systeme |
ES2330496B1 (es) * | 2007-10-31 | 2010-09-08 | Bsh Electrodomesticos España, S.A. | Dispositivo de coccion. |
CN201178498Y (zh) * | 2008-04-03 | 2009-01-07 | 深圳和而泰智能控制股份有限公司 | 电磁炉浪涌保护电路 |
-
2009
- 2009-11-05 ES ES200930959A patent/ES2378607B1/es not_active Revoked
-
2010
- 2010-10-29 CN CN201080050025.2A patent/CN102598849B/zh not_active Expired - Fee Related
- 2010-10-29 EP EP10778726.9A patent/EP2497332B1/de active Active
- 2010-10-29 ES ES10778726.9T patent/ES2589044T3/es active Active
- 2010-10-29 WO PCT/IB2010/054907 patent/WO2011055283A1/de active Application Filing
- 2010-10-29 PL PL10778726T patent/PL2497332T3/pl unknown
Non-Patent Citations (1)
Title |
---|
See references of WO2011055283A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN102598849B (zh) | 2014-12-31 |
ES2378607A1 (es) | 2012-04-16 |
WO2011055283A1 (de) | 2011-05-12 |
ES2378607B1 (es) | 2013-03-14 |
EP2497332B1 (de) | 2016-08-17 |
CN102598849A (zh) | 2012-07-18 |
PL2497332T3 (pl) | 2017-01-31 |
ES2589044T3 (es) | 2016-11-08 |
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Inventor name: CARRETERO CHAMARRO, CLAUDIO Inventor name: ARTIGAS MAESTRE, JOSE IGNACIO Inventor name: JIMENEZ NAVASCUES, OSCAR Inventor name: URRIZA PARROQUE, ISIDRO Inventor name: BERNAL RUIZ, CARLOS Inventor name: MILLAN SERRANO, IGNACIO Inventor name: PUYAL PUENTE, DIEGO Inventor name: LUCIA GIL, OSCAR Inventor name: BARRAGAN PEREZ, LUIS, ANGEL Inventor name: HERNANDEZ BLASCO, PABLO, JESUS Inventor name: PARICIO AZCONA, JOSE, JOAQUIN Inventor name: BURDIO PINILLA, JOSE, MIGUEL Inventor name: MONTERDE AZNAR, FERNANDO Inventor name: LLORENTE GIL, SERGIO Inventor name: NAVARRO TABERNERO, DENIS Inventor name: GARCIA JIMENEZ, JOSE-RAMON Inventor name: ANTON FALCON, DANIEL Inventor name: MEDIANO HEREDIA, ARTURO Inventor name: MOROS SANZ, DANIEL Inventor name: DE LA CUERDA ORTIN, JOSE, MARIA |
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Inventor name: ANTON FALCON, DANIEL Inventor name: JIMENEZ NAVASCUES, OSCAR Inventor name: LUCIA GIL, OSCAR Inventor name: CARRETERO CHAMARRO, CLAUDIO Inventor name: GARCIA JIMENEZ, JOSE-RAMON Inventor name: MEDIANO HEREDIA, ARTURO Inventor name: PARICIO AZCONA, JOSE, JOAQUIN Inventor name: NAVARRO TABERNERO, DENIS Inventor name: DE LA CUERDA ORTIN, JOSE, MARIA Inventor name: MONTERDE AZNAR, FERNANDO Inventor name: HERNANDEZ BLASCO, PABLO, JESUS Inventor name: URRIZA PARROQUE, ISIDRO Inventor name: LLORENTE GIL, SERGIO Inventor name: BURDIO PINILLA, JOSE, MIGUEL Inventor name: MILLAN SERRANO, IGNACIO Inventor name: MOROS SANZ, DANIEL Inventor name: PUYAL PUENTE, DIEGO Inventor name: ARTIGAS MAESTRE, JOSE IGNACIO Inventor name: BARRAGAN PEREZ, LUIS, ANGEL Inventor name: BERNAL RUIZ, CARLOS |
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