EP2352359B1 - Induction hotplate with multiple induction heaters - Google Patents
Induction hotplate with multiple induction heaters Download PDFInfo
- Publication number
- EP2352359B1 EP2352359B1 EP11164169.2A EP11164169A EP2352359B1 EP 2352359 B1 EP2352359 B1 EP 2352359B1 EP 11164169 A EP11164169 A EP 11164169A EP 2352359 B1 EP2352359 B1 EP 2352359B1
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- Prior art keywords
- induction
- heating elements
- induction heating
- heating
- control unit
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- 230000006698 induction Effects 0.000 title claims description 178
- 238000010438 heat treatment Methods 0.000 claims description 226
- 238000005259 measurement Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 13
- 239000011159 matrix material Substances 0.000 claims description 11
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 230000009849 deactivation Effects 0.000 claims description 2
- 230000000737 periodic effect Effects 0.000 claims description 2
- 238000010411 cooking Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000012447 hatching Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
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Classifications
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- 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
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- 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
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
- H05B2213/03—Heating plates made out of a matrix of heating elements that can define heating areas adapted to cookware randomly placed on the heating plate
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
- H05B2213/05—Heating plates with pan detection means
Definitions
- the invention relates to an induction hob with a plurality of induction heaters according to the preamble of claim 1 and a method for operating an induction hob according to the preamble of claim 15.
- So-called matrix induction hobs with a large number of induction heating elements, which are arranged in a grid or in a matrix, are known from the prior art.
- the comparatively small induction heating elements can be flexibly combined to form essentially freely definable heating zones.
- a control unit of the induction hob can detect cookware elements and combine those induction heating elements that are at least to some extent covered by a bottom of the detected cooking utensil element to a heating zone associated with the detected cookware element and operate synchronized.
- Such induction hobs comprise a measuring arrangement with which the control unit can record characteristic values for a power of the individual induction heaters and use it to regulate the power to a desired value.
- a characteristic may be, for example, a resistance, a current and / or an impedance of the induction heating element influenced by the cookware element in its electrical properties.
- the induction heating elements are operated with high-frequency currents compared to the mains voltage, the measurement and evaluation of the signals of the measuring arrangement is complicated and the provision of the sensor system for each individual induction heating element is cost-intensive.
- the invention is in particular the object of providing a generic induction hob, which is controllable with a less complex control algorithm. Furthermore, the invention has the object to reduce a required computing power of a control unit of such an induction hob and to simplify a measuring arrangement of such induction hob. Another task The invention is to simplify a method of operating such an induction hob.
- the invention is based on an induction hob with a plurality of induction heaters, a control unit which is designed to operate synchronously a plurality of induction heaters a flexibly definable heating zone, and a measuring arrangement for measuring a heating power generated by the induction heaters.
- the measuring arrangement is designed to measure a sum of heating powers of at least two induction heaters.
- the control unit should also be designed to use the sum of the heating power to control the heating power.
- the control unit should be designed to operate in at least one operating state, multiple groups of induction heaters simultaneously with an inverter.
- the control unit and the measuring arrangement may be "designed" by suitable software, hardware, or a combination of these two factors to accomplish their tasks.
- the invention is based in particular on the finding that in modern matrix induction hobs adjacent induction heaters are usually associated with the same heating zone. Detecting the individual heating power is unnecessary in this case and leads to an unnecessarily large complexity of the controller and to a less meaningful use of computing power. This is all the more true, the smaller the induction heaters are or the narrower the grid of the matrix induction hob is, since the proportion of those induction heaters, which are located at the edge of the heating zone, decreases with the grid. Further, by measuring the sums of the heating powers of groups of induction heaters, the number of necessary sensors can be reduced. For example, if a current is used as the parameter for the heating power, only one current sensor or ammeter must be used for each group of heating elements.
- the measuring arrangement comprises a current sensor for measuring a sum of currents which flow through the at least two induction heaters.
- a sufficiently accurate feedback quantity can be determined for performing a power control of the heating zone.
- a complexity of the control loop rhythm can be significantly reduced, and a number of required current sensors can be reduced.
- the cooktop comprises a plurality of respective driver units associated with an induction heater each having an inverter for generating a high frequency current for operating an induction body
- high frequency measurement can be avoided when the measurement arrangement is adapted to measure a sum of input powers of the driver units.
- the input currents are typically currents with the grid frequency of, for example, 50 hertz of a household power grid and can therefore be measured with particularly simple and inexpensive standard sensor arrangements.
- the measuring arrangement is designed to additionally measure the values of the currents flowing through the individual induction heaters.
- These currents can be used as control variables, for example, in exceptional cases, in which the knowledge of the individual heating power of the induction heaters is required or can be used to limit the safety of the services of the induction heaters and / or the driver units.
- the control unit can use the currents of the individual induction heaters to limit the inverter power.
- control unit is designed to use the sum of the heating powers for controlling the heating power, if the at least two induction heaters are assigned to a common heating zone, and the values of the currents of the individual induction heaters for controlling the heating power to use this induction heater when the at least two induction heaters are assigned to different heating zones.
- the inventive combination of two induction heaters in terms of power measurement is particularly advantageous when the two combined induction heaters adjacent induction heaters are in a matrix of induction heaters.
- the measuring arrangement and the data processing in the control unit can be further simplified if the measuring arrangement is designed to measure a sum of the heating powers of at least four adjacent induction heaters. Of course, six, eight or any other number of induction heaters can be grouped together.
- control unit is designed to form a heating zone from a plurality of groups of induction heaters and to feed each of the groups from another inverter.
- the control unit can then use the input currents of the inverters as a parameter for the sum of the heating powers of the induction heating elements fed by the relevant inverter, so that a power control without the measurement of the high-frequency heating currents can also be made possible in this case.
- control unit can determine the proportion which one of the groups contributes to a total heat output in a phase in which only the induction heaters of this group are active.
- control unit is designed to operate a plurality of groups of induction heaters with a single inverter and to produce the different heating powers by a short-term, periodic deactivation of at least one induction heater.
- Another aspect of the invention relates to a method of operating an induction hob with a plurality of induction heaters that are flexibly grouped into a heating zone.
- a heating power generated by the induction heaters is measured and used to control the operation of the induction heaters.
- a sum of heating powers of at least two induction heaters is measured and used as a control variable for operating the at least two induction heaters.
- FIG. 1 shows an induction hob with a plurality of induction heating elements 10, which can be combined by a control unit 12 in groups of flexibly definable heating zones 14 and operated synchronized.
- the control unit 12 communicates with a measuring arrangement 16 of the induction cooktop, by means of which the control unit 12 can detect parameters for a heating power P, Pi generated by the induction heaters 10a, 10b. These parameters include currents, voltages and / or the electrical loss angles or impedances which can be tapped as measured values from the measuring arrangement 16 at different points of the induction hob.
- the measuring arrangement 16 is designed for measuring a sum of heating powers P of at least two group-assembled induction heaters 10a, 10b. While in concrete embodiments of the invention, the group of induction heaters whose heat output is measured in total, four or more induction heaters may include, in the schematic representation in FIG. 2 for reasons of clarity, only two induction heaters 10a, 10b shown.
- Each of the induction heaters 10a, 10b has an associated drive unit 20a, 20b, each comprising an inverter 22a, 22b.
- the inverter 22a, 22b generates from a direct current generated by a rectifier 24 with a in a diagram 26 in FIG. 2 shown voltage curve in comparison to a mains frequency of a household power network 28 high-frequency heating current I1, I2 for operating the induction heater 10a, 10b.
- a filter 30 is arranged, which prevents damage to the induction hob by power surges from the household electricity network 28.
- a diagram 32 shows a voltage curve of the heating current I1, I2, which has a frequency of 20 to 50 kHz and an oscillating with the mains frequency envelope depending on a desired heating power of the heating zone 14.
- the current sensor 18 may be disposed between the filter 30 and the rectifier 24 so as to substantially measure the low frequency alternating current from the home electric grid 28 at a grid frequency of 50 Hertz.
- the measuring arrangement 16 with the current sensor 18 therefore measures a sum P of input powers of the driver units 20a, 20b.
- the input current I of the rectifier 24 is used as a parameter for the input powers.
- Further current sensors 34a, 34b of the measuring arrangement 16 serve to measure the currents I1, I2 which flow through the individual induction heaters 10a, 10b.
- the currents I1, I2 are therefore the actual heating currents of the induction heaters 10a, 10b. If both induction heaters 10a, 10b are associated with the same heating zone 14 and are completely covered by a pot bottom of a cooking element disposed on the heating zone 14, the currents I1, I2 are at least substantially equal and can be in a very good approximation to a predetermined fraction of the input current I of the rectifier 24 are calculated.
- the control unit 12 uses the currents I1, I2 of the individual induction heaters 10a, 10b measured by the current sensors 34a, 34b, as a rule, only for protecting the inverters 22a, 22b and for detecting the cookware elements on the induction hob.
- the signals obtained from the current sensors 34a, 34b do not have to be subjected to complex signal processing, so that a complexity of the tasks of the control unit 12 can be greatly reduced in comparison with conventional induction hobs.
- the amplitudes of the currents I1, I2 need only be compared to a threshold value.
- the control unit 12 comprises a freely programmable processor and an operating program, which first performs a cookware detection method periodically or after a start signal of the user.
- the control unit 12 detects a size and position of cooking utensils placed on the induction hob or on a cover plate of the induction high field and combines induction heating elements 10, which are at least to some extent covered by the cookware element, into a heating zone 14.
- control unit 12 regulates a heating power of the heating zone 14 to a setpoint dependent on the heating stage. For this purpose, it forms a sum of the heating powers of the individual induction heating elements 10 and compares this sum with the setpoint value.
- control unit 12 uses the sum signal of the current sensor 18 when all induction heaters 10 whose heating power is measured together by the current sensor 18, the heating zone 14 belong. Otherwise, the control unit 12 uses the current sensors 34a, 34b to determine the individual heating powers Pi.
- control unit 12 uses the signal of the current sensor 18 to determine the heating power. In comparison to groups of induction heating elements which belong completely to the heating zone 14, the setpoint heating power of this group flowing into the control is reduced by a factor corresponding to the proportion of the active induction heating elements.
- the above-described induction hob or control unit 12 implements a method for operating an induction hob with a plurality of induction heaters 10 a, 10 b, which can be flexibly grouped and combined to form a heating zone 14.
- a heating power generated by the induction heaters 10a, 10b is measured and used to control the operation of the induction heaters 10a, 10b.
- control unit 12 detects a sum of heating powers of a group of induction heaters 10a, 10b and uses this sum in a normal case as a controlled variable for operating the group of induction heaters 10a, 10b.
- the heating currents of the individual induction heaters 10a, 10b also flow into the control method as control parameters.
- FIG. 3 shows a schematic representation of a matrix cooktop with two inverters 22a, 22b, which can be connected via a switching arrangement 36 with induction heaters 10a - 10e.
- the hob comprises a matrix of induction heaters 10a - 10e, of which in FIG. 3 only five pieces are shown as examples.
- a satisfactory spatial resolution in the definition of the heating zones 14 can be realized at a reasonable cost and an acceptable control effort, if the actual number of induction heaters 10a - 10e is between 40 and 64.
- the switching arrangement 36 can connect at least individual ones of the induction heating elements 10a-10e optionally to one of the two inverters 22a, 22b, or each of the inverters 22a, 22b to selectable groups of induction heating elements 10a-10e.
- each of the inverters 22a, 22b is equipped with a current sensor 18a, 18b, which is arranged between a rectifier 24 and the respective inverter 22a, 22b.
- the current sensors 18a, 18b measure the rectified current from the household power grid 28, the relevant frequency components amount to a maximum of about 100 Hz. Because of the low frequencies, current measurements of the input current of the inverters 22a, 22b are simpler than current measurements of the output currents of the inverters 22a, 22b, whose frequency is on the order of 75 kHz.
- FIG. 4 schematically shows a heating zone 14, which is formed by nine induction heating 10a10i.
- a first group of induction heaters 10a-10c is powered by a first inverter 22a and a second group of induction heaters 10d-10i is powered by a second inverter 22b.
- the control unit 12 calculates a target total heating power for the heating zone 14, depending on the set power level and the size of the heating zone 14.
- the control unit 12 controls the heating power of the heating zone 14 on the sun specific setpoint.
- the control unit calculates from the input currents I1, I2 of the inverters 22a, 22b, which are measured via the current sensors 18a, 18b, a total heating power of the two groups of induction heating elements 10a-10i and calculates the total heating power of the heating zone 14 by isolating the heating powers of the groups ,
- the heating power can be controlled to the target value by varying the heating frequency generated by the inverters 22a, 22b in a closed loop.
- the heating elements 10a-10j of the two groups are each operated with heating currents at the same frequency.
- the group heating powers of the two groups then automatically adjust to a value which is determined by the coupling strength of the different induction heating elements 10a-10j to the bottom of the cooking pot.
- the control unit 12 can control the heating power of the individual induction heating elements 10a-10j by means of limiting current sensors of the type shown in FIG FIG. 2 Monitor the type shown. If an imbalance arises between the group heating powers of the two groups, the control unit can assign one of the induction heaters 10a-10j to the other group by switching the switching arrangement 36.
- control unit 12 can operate the induction heating elements 10a-10i of one of the groups in a clocked manner by actuation of the switching arrangement 36, or the inverters 22a, 22b can generate heating currents with different heating frequencies.
- FIG. 5 shows a flowchart of a method for distributing a total heat output to the inverters in the in FIG. 4 illustrated situation.
- a ratio of the group heating powers is calculated by different groups of heating elements, which together form a heating zone 14. For example, it may be determined that a first group of induction heating elements 10a-10i should produce 70% of the total heating power and that a second group of induction heating elements 10a-10i should produce 30% of the total heating power.
- This distribution can be, for example be chosen so that the bottom of the cookware heats up as homogeneously as possible.
- the surface portions of the cookware base assigned to the different groups of induction heating elements 10a-10i are determined or estimated by the control unit 12 and the distribution of the total heating power takes place in the ratio of the surface portions.
- the control unit 12 can determine the group heating power of the two groups at any moment and regulate it to the setpoint that corresponds to the predetermined proportion of the total heating power.
- the group heating powers may be accomplished by varying the frequency of the heating currents, by changing the amplitude of the heating currents, or by suitably adjusting lengths of operating phases of the various groups of heating elements in a timed operation.
- the amplitude change can be achieved by a change in the pulse phase of control signals, which are transmitted from the control unit 12 to the inverters 22a, 22b.
- the control unit 12 decides which of the above-mentioned methods is used. Preference is always given to the simultaneous change in the frequency of the heating currents of both groups, as this interference hum can be avoided.
- step S3 the operating parameters are changed so that the group heating power changes in the direction of its setpoint. Subsequently, the process returns to step S1 to close the control loop.
- FIG. 6 shows a schematic representation of two heating zones 14a, 14b, the induction heating elements 10a - 10d and 10e - 10g from a single inverter 22 (not shown) are operated.
- the control unit 12 can determine via a current sensor 18 only the input current of the inverter and thus the total heating power of both heating zones 14a, 14b, if both heating zones 14a, 14b are operated simultaneously.
- the control unit 12 uses an in FIG. 7 schematically illustrated method.
- the control unit disconnects by operating the switching arrangement 36, the inductors 10a-10d of the first heating zone 14a from the inverter and measured via the inverter associated with the current sensor 18, the now consumed only by the second heating zone 14b heating power.
- the control unit 12 closes the connection between the induction heating elements 10a-10d of the heating zones 14a with the inverter 22 by actuating the switching arrangement 36. Subsequently, the control unit 12 again measures the total heat output now consumed by the two heating zones 14a, 14b with the aid of the current sensor 18.
- the heating power of the second heating zones 14b is calculated in a step S73 by forming the difference between the total heating power determined in step S72 and the heating power determined in step S71.
- the control unit forms the ratio of the heating powers of the individual heating zones 14a, 14b and compares it with a desired value. In the case of a clocked operation of the induction heating elements 10a-10i, the control unit takes into account that the heating elements of the heating zones 14a, 14b are switched off in phases and calculates an average heating power. If deviations from the target value occur, the control unit 12 changes in a step S75 the duration of the heating phases of the heating zones 14a, 14b so that the ratio changes in the direction of the target value.
- FIG. 8 shows a schematic representation of two heating zones 14a, 14b, the induction heating elements 10a - 10g are each fed by a plurality of inverters. Each of an inverter associated induction heating are in FIG. 8 represented with the same hatching.
- the distribution of the total heating power to the various heating zones 14a, 14b and to the various heating elements 10a-10g is effected by a combination of the in Figures 5 and 7 illustrated method.
- the second heating zone 14b is switched off for a short time.
- the input currents of each inverter are measured so that the distribution of the total heating power of both heating zones 14a, 14b to the various inverters is immediately known.
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Description
Die Erfindung betrifft ein Induktionskochfeld mit einer Mehrzahl von Induktionsheizkörpern nach dem Oberbegriff des Anspruchs 1 und ein Verfahren zum Betreiben eines Induktionskochfelds nach dem Oberbegriff des Anspruchs 15.The invention relates to an induction hob with a plurality of induction heaters according to the preamble of
Aus dem Stand der Technik sind so genannte Matrix-Induktionskochfelder mit einer Vielzahl von Induktionsheizelementen bekannt, die in einem Raster bzw. in einer Matrix angeordnet sind. Die vergleichsweise kleinen Induktionsheizelemente können flexibel zu im Wesentlichen frei definierbaren Heizzonen zusammengefasst werden. Eine Steuereinheit des Induktionskochfelds kann Kochgeschirrelemente detektieren und diejenigen Induktionsheizelemente, die zu wenigstens einem gewissen Grad von einem Boden des detektierten Kochgeschirrelements überdeckt sind, zu einer den detektierten Kochgeschirrelement zugeordneten Heizzone zusammenfassen und synchronisiert betreiben. Solche Induktionskochfelder umfassen eine Messanordnung, mit welcher die Steuereinheit Kenngrößen für eine Leistung der einzelnen Induktionsheizkörper erfasst und zum Regeln der Leistung auf einen Sollwert nutzen kann. Eine solche Kenngröße kann beispielsweise ein Widerstand, ein Strom und/oder eine Impedanz des in seinen elektrischen Eigenschaften durch das Kochgeschirrelement beeinflussten Induktionsheizelements sein.So-called matrix induction hobs with a large number of induction heating elements, which are arranged in a grid or in a matrix, are known from the prior art. The comparatively small induction heating elements can be flexibly combined to form essentially freely definable heating zones. A control unit of the induction hob can detect cookware elements and combine those induction heating elements that are at least to some extent covered by a bottom of the detected cooking utensil element to a heating zone associated with the detected cookware element and operate synchronized. Such induction hobs comprise a measuring arrangement with which the control unit can record characteristic values for a power of the individual induction heaters and use it to regulate the power to a desired value. Such a characteristic may be, for example, a resistance, a current and / or an impedance of the induction heating element influenced by the cookware element in its electrical properties.
Da die Induktionsheizelemente mit im Vergleich zur Netzspannung hochfrequenten Strömen betrieben werden, ist die Messung und Auswertung der Signale der Messanordnung aufwändig und das Bereitstellen der Sensorik für jedes einzelne Induktionsheizelement kostenintensiv.Since the induction heating elements are operated with high-frequency currents compared to the mains voltage, the measurement and evaluation of the signals of the measuring arrangement is complicated and the provision of the sensor system for each individual induction heating element is cost-intensive.
Der Erfindung liegt insbesondere die Aufgabe zugrunde, ein gattungsgemäßes Induktionskochfeld bereitzustellen, das mit einem weniger komplexen Steuerungsalgorithmus steuerbar ist. Ferner liegt der Erfindung die Aufgabe zugrunde, eine erforderliche Rechenleistung einer Steuereinheit eines solchen Induktionskochfelds zu reduzieren und eine Messanordnung eines solchen Induktionskochfelds zu vereinfachen. Eine weitere Aufgabe der Erfindung besteht darin, ein Verfahren zum Betreiben eines solchen Induktionskochfelds zu vereinfachen.The invention is in particular the object of providing a generic induction hob, which is controllable with a less complex control algorithm. Furthermore, the invention has the object to reduce a required computing power of a control unit of such an induction hob and to simplify a measuring arrangement of such induction hob. Another task The invention is to simplify a method of operating such an induction hob.
Die Aufgabe wird insbesondere durch die unabhängigen Patentansprüche gelöst. Vorteilhafte Weiterbildungen und Ausgestaltungen der Erfindung können den Unteransprüchen entnommen werden.The object is achieved in particular by the independent patent claims. Advantageous developments and refinements of the invention can be taken from the subclaims.
Die Erfindung geht aus von einem Induktionskochfeld mit einer Mehrzahl von Induktionsheizkörpern, einer Steuereinheit, die dazu ausgelegt ist, mehrere Induktionsheizkörper einer flexibel definierbaren Heizzone synchronisiert zu betreiben, und einer Messanordnung zum Messen einer von den Induktionsheizkörpern erzeugten Heizleistung.The invention is based on an induction hob with a plurality of induction heaters, a control unit which is designed to operate synchronously a plurality of induction heaters a flexibly definable heating zone, and a measuring arrangement for measuring a heating power generated by the induction heaters.
Es wird vorgeschlagen, dass die Messanordnung zum Messen einer Summe von Heizleistungen von wenigstens zwei Induktionsheizkörpern ausgelegt ist. Dabei soll die Steuereinheit ferner dazu ausgelegt sein, die Summe der Heizleistungen zum Regeln der Heizleistung zu nutzen. Des Weiteren soll die Steuereinheit dazu ausgelegt sein, in zumindest einem Betriebszustand mehrere Gruppen von Induktionsheizkörpern simultan mit einem Wechselrichter zu betreiben. Die Steuereinheit und die Messanordnung können durch eine geeignete Software, eine geeignete Hardware oder durch eine Kombination aus diesen beiden Faktoren zum Erfüllen ihrer Aufgaben "ausgelegt" sein.It is proposed that the measuring arrangement is designed to measure a sum of heating powers of at least two induction heaters. In this case, the control unit should also be designed to use the sum of the heating power to control the heating power. Furthermore, the control unit should be designed to operate in at least one operating state, multiple groups of induction heaters simultaneously with an inverter. The control unit and the measuring arrangement may be "designed" by suitable software, hardware, or a combination of these two factors to accomplish their tasks.
Die Erfindung basiert insbesondere auf der Feststellung, dass in modernen Matrix-Induktionskochfeldern benachbarte Induktionsheizkörper in der Regel der gleichen Heizzone zugeordnet sind. Das Erfassen der individuellen Heizleistungen ist in diesem Fall unnötig und führt zu einer unnötig großen Komplexität der Steuerung und zu einem wenig sinnvollen Einsatz von Rechenleistung. Dies gilt umso mehr, je kleiner die Induktionsheizkörper sind bzw. je enger das Raster des Matrix-Induktionskochfelds ist, da der Anteil derjenigen Induktionsheizkörper, die am Rand der Heizzone liegen, mit dem Rastermaß abnimmt. Ferner kann durch die Messung der Summen der Heizleistungen von Gruppen von Induktionsheizkörpern die Anzahl der notwendigen Sensoren verringert werden. Wenn beispielsweise ein Strom als Kenngröße für die Heizleistung verwendet wird, muss für jede Gruppe von Heizelementen nur ein Stromsensor bzw. Amperemeter verwendet werden.The invention is based in particular on the finding that in modern matrix induction hobs adjacent induction heaters are usually associated with the same heating zone. Detecting the individual heating power is unnecessary in this case and leads to an unnecessarily large complexity of the controller and to a less meaningful use of computing power. This is all the more true, the smaller the induction heaters are or the narrower the grid of the matrix induction hob is, since the proportion of those induction heaters, which are located at the edge of the heating zone, decreases with the grid. Further, by measuring the sums of the heating powers of groups of induction heaters, the number of necessary sensors can be reduced. For example, if a current is used as the parameter for the heating power, only one current sensor or ammeter must be used for each group of heating elements.
Nach einer Weiterbildung der Erfindung wird vorgeschlagen, dass die Messanordnung einen Stromsensor zum Messen einer Summe von Strömen umfasst, welche die wenigstens zwei Induktionsheizkörper durchfließen. Daraus kann in der Regel, wenn die wenigstens zwei Induktionsheizkörper der gleichen Heizzone zugeordnet sind, eine hinreichend genaue Rückkopplungsgröße zum Durchführen einer Leistungsregelung der Heizzone ermittelt werden. Eine Komplexität des Regelkreisrhythmus kann deutlich verringert werden, und eine Anzahl von benötigten Stromsensoren kann reduziert werden.According to a development of the invention it is proposed that the measuring arrangement comprises a current sensor for measuring a sum of currents which flow through the at least two induction heaters. As a rule, when the at least two induction heaters are assigned to the same heating zone, a sufficiently accurate feedback quantity can be determined for performing a power control of the heating zone. A complexity of the control loop rhythm can be significantly reduced, and a number of required current sensors can be reduced.
Wenn das Kochfeld eine Mehrzahl von jeweils einem Induktionsheizkörper zugeordneten Treibereinheiten umfasst, die jeweils einen Wechselrichter zum Erzeugen eines Hochfrequenzstroms zum Betreiben eines Induktionskörpers aufweisen, kann eine Hochfrequenzmessung vermieden werden, wenn die Messanordnung dazu ausgelegt ist, eine Summe von Eingangsleistungen der Treibereinheiten zu messen. Die Eingangsströme sind in der Regel Ströme mit der Netzfrequenz von beispielsweise 50 Hertz eines Haushaltsstromnetzes und können daher mit besonders einfachen und kostengünstigen Standard-Sensoranordnungen gemessen werden.When the cooktop comprises a plurality of respective driver units associated with an induction heater each having an inverter for generating a high frequency current for operating an induction body, high frequency measurement can be avoided when the measurement arrangement is adapted to measure a sum of input powers of the driver units. The input currents are typically currents with the grid frequency of, for example, 50 hertz of a household power grid and can therefore be measured with particularly simple and inexpensive standard sensor arrangements.
Ferner wird vorgeschlagen, dass die Messanordnung dazu ausgelegt ist, zusätzlich die Werte der Ströme zu messen, die die einzelnen Induktionsheizkörper durchfließen. Diese Ströme können beispielsweise in Ausnahmefällen, in denen die Kenntnis der individuellen Heizleistungen der Induktionsheizkörper erforderlich ist, als Regelgrößen verwendet werden oder können zur Sicherheitsbegrenzung der Leistungen der Induktionsheizkörper und/oder der Treibereinheiten genutzt werden. Insbesondere kann die Steuereinheit die Ströme der einzelnen Induktionsheizkörper zum Begrenzen der Wechselrichter-Leistung nutzen.It is also proposed that the measuring arrangement is designed to additionally measure the values of the currents flowing through the individual induction heaters. These currents can be used as control variables, for example, in exceptional cases, in which the knowledge of the individual heating power of the induction heaters is required or can be used to limit the safety of the services of the induction heaters and / or the driver units. In particular, the control unit can use the currents of the individual induction heaters to limit the inverter power.
Nach einer weiteren Ausgestaltung der Erfindung wird vorgeschlagen, dass die Steuereinheit dazu ausgelegt ist, die Summe der Heizleistungen zum Regeln der Heizleistung zu nutzen, wenn die wenigstens zwei Induktionsheizkörper einer gemeinsamen Heizzone zugeordnet sind, und die Werte der Ströme der einzelnen Induktionsheizkörper zum Regeln der Heizleistung dieser Induktionsheizkörper zu nutzen, wenn die wenigstens zwei Induktionsheizkörper unterschiedlichen Heizzonen zugeordnet sind. Dadurch kann in jedem dieser Fälle eine zuverlässige Regelung der Heizleistungen gewährleistet werden, wobei gleichzeitig das Erfassen und Verarbeiten von unnötigen Daten bzw. Messwerten vermieden werden kann.According to a further embodiment of the invention, it is proposed that the control unit is designed to use the sum of the heating powers for controlling the heating power, if the at least two induction heaters are assigned to a common heating zone, and the values of the currents of the individual induction heaters for controlling the heating power to use this induction heater when the at least two induction heaters are assigned to different heating zones. As a result, reliable control of the heating powers can be ensured in each of these cases, while at the same time the detection and processing of unnecessary data or measured values can be avoided.
Die erfindungsgemäße Zusammenfassung von zwei Induktionsheizkörpern im Hinblick auf die Leistungsmessung ist insbesondere dann vorteilhaft einsetzbar, wenn die beiden zusammengefassten Induktionsheizkörper benachbarte Induktionsheizkörper in einer Matrix von Induktionsheizkörpern sind. Die Messanordnung und die Datenverarbeitung in der Steuereinheit können weiter vereinfacht werden, wenn die Messanordnung zum Messen einer Summe der Heizleistungen von wenigstens vier benachbarten Induktionsheizkörpern ausgelegt ist. Selbstverständlich können auch sechs, acht oder jede andere Zahl von Induktionsheizkörpern zu einer Gruppe zusammengefasst werden.The inventive combination of two induction heaters in terms of power measurement is particularly advantageous when the two combined induction heaters adjacent induction heaters are in a matrix of induction heaters. The measuring arrangement and the data processing in the control unit can be further simplified if the measuring arrangement is designed to measure a sum of the heating powers of at least four adjacent induction heaters. Of course, six, eight or any other number of induction heaters can be grouped together.
Ferner wird vorgeschlagen, dass die Steuereinheit dazu ausgelegt ist, eine Heizzone aus mehreren Gruppen von Induktionsheizkörpern zu bilden und jede der Gruppen von einem anderen Wechselrichter zu speisen. Die Steuereinheit kann dann die Eingangsströme der Wechselrichter als Kenngröße für die Summe der Heizleistungen der von dem betreffenden Wechselrichter gespeisten Induktionsheizkörper nutzen, so dass auch in diesem Fall eine Leistungsregelung ohne die Messung der hochfrequenten Heizströme ermöglicht werden kann.It is also proposed that the control unit is designed to form a heating zone from a plurality of groups of induction heaters and to feed each of the groups from another inverter. The control unit can then use the input currents of the inverters as a parameter for the sum of the heating powers of the induction heating elements fed by the relevant inverter, so that a power control without the measurement of the high-frequency heating currents can also be made possible in this case.
Auch wenn die Steuereinheit dazu ausgelegt ist, in zumindest einem Betriebszustand mehrere Gruppen von Induktionsheizkörpern mit einem einzigen Wechselrichter zu betreiben, kann dennoch die Heizleistung der einzelnen Gruppen bestimmt werden. Dazu kann die Steuereinheit den Anteil, den eine der Gruppen zu einer Gesamtheizleistung beiträgt in einer Phase bestimmen, in der nur die Induktionsheizkörper dieser Gruppe aktiv sind.Even if the control unit is designed to operate in at least one operating state, several groups of induction heaters with a single inverter, the heating power of the individual groups can still be determined. For this purpose, the control unit can determine the proportion which one of the groups contributes to a total heat output in a phase in which only the induction heaters of this group are active.
Unterschiedliche Heizleistungen verschiedener Gruppen können einfach realisiert werden, wenn die Steuereinheit dazu ausgelegt ist, mehrere Gruppen von Induktionsheizkörpern mit einem einzigen Wechselrichter zu betreiben und die unterschiedlichen Heizleistungen durch ein kurzfristiges, periodisches Deaktivieren wenigstens eines Induktionsheizkörpers zu erzeugen.Different heating powers of different groups can be easily realized if the control unit is designed to operate a plurality of groups of induction heaters with a single inverter and to produce the different heating powers by a short-term, periodic deactivation of at least one induction heater.
Ein weiterer Aspekt der Erfindung betrifft ein Verfahren zum Betreiben eines Induktionskochfelds mit einer Mehrzahl von Induktionsheizkörpern, die flexibel zu einer Heizzone gruppiert werden. Dabei wird eine von den Induktionsheizkörpern erzeugte Heizleistung gemessen und zum Regeln des Betriebs der Induktionsheizkörper genutzt.Another aspect of the invention relates to a method of operating an induction hob with a plurality of induction heaters that are flexibly grouped into a heating zone. In this case, a heating power generated by the induction heaters is measured and used to control the operation of the induction heaters.
Erfindungsgemäß wird vorgeschlagen, dass eine Summe von Heizleistungen von wenigstens zwei Induktionsheizkörpern gemessen wird und als Regelgröße zum Betreiben der wenigstens zwei Induktionsheizkörper genutzt wird.According to the invention, it is proposed that a sum of heating powers of at least two induction heaters is measured and used as a control variable for operating the at least two induction heaters.
Weitere Vorteile ergeben sich aus der folgenden Zeichnungsbeschreibung. In der Zeichnung ist ein Ausführungsbeispiel der Erfindung dargestellt. Die Zeichnung, die Beschreibung und die Ansprüche enthalten zahlreiche Merkmale in Kombination. Der Fachmann wird die Merkmale zweckmäßigerweise auch einzeln betrachten und zu sinnvollen weiteren Kombinationen zusammenfassen.Further advantages emerge from the following description of the drawing. In the drawing, an embodiment of the invention is shown. The drawing, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.
Es zeigen:
- Fig. 1
- ein Induktionskochfeld mit einer Matrix von Induktionsheizkörpern,
- Fig. 2
- eine schematische Darstellung zum Betrieb eines Paars von Induktionsheizkörpern,
- Fig. 3
- eine schematische Darstellung eines Matrix-Kochfelds mit mehreren Wechselrichtern,
- Fig. 4
- eine schematische Darstellung einer Heizzone mit mehreren Gruppen von Induktoren, die von unterschiedlichen Wechselrichtern gespeist werden,
- Fig. 5
- ein Ablaufdiagramm eines Verfahrens zur Verteilung einer Gesamtheizleistung auf die Wechselrichter in der in
Figur 4 dargestellten Situation, - Fig. 6
- eine schematische Darstellung von zwei Heizzonen, deren Induktionsheizelemente von einem einzigen Wechselrichter gespeist werden,
- Fig. 7
- ein Ablaufdiagramm eines Verfahrens zur Verteilung einer Gesamtheizleistung auf die Induktionsheizelemente in der in
Figur 6 dargestellten Situation und - Fig. 8
- eine schematische Darstellung von zwei Heizzonen, deren Induktionsheizelemente jeweils von mehreren Wechselrichtern gespeist werden.
- Fig. 1
- an induction hob with a matrix of induction heaters,
- Fig. 2
- a schematic representation of the operation of a pair of induction heaters,
- Fig. 3
- a schematic representation of a matrix cooktop with multiple inverters,
- Fig. 4
- a schematic representation of a heating zone with multiple groups of inductors, which are fed by different inverters,
- Fig. 5
- a flow chart of a method for distributing a total heat output to the inverter in the in
FIG. 4 illustrated situation, - Fig. 6
- a schematic representation of two heating zones, the induction heating elements are powered by a single inverter,
- Fig. 7
- a flow chart of a method for distributing a total heating power to the induction heating in the in
FIG. 6 presented situation and - Fig. 8
- a schematic representation of two heating zones, the induction heating are each fed by multiple inverters.
Durch einen gemeinsamen Stromsensor 18 (siehe
Jeder der Induktionsheizkörper 10a, 10b verfügt über eine ihm zugeordnete Treibereinheit 20a, 20b, die jeweils einen Wechselrichter 22a, 22b umfasst. Der Wechselrichter 22a, 22b erzeugt aus einem von einem Gleichrichter 24 erzeugten Gleichstrom mit einem in einem Diagramm 26 in
Ein Diagramm 32 zeigt einen Spannungsverlauf des Heizstroms I1, I2, der abhängig von einer Soll-Heizleistung der Heizzone 14 eine Frequenz von 20 bis 50 kHz und eine mit der Netzfrequenz oszillierende Hüllkurve hat.A diagram 32 shows a voltage curve of the heating current I1, I2, which has a frequency of 20 to 50 kHz and an oscillating with the mains frequency envelope depending on a desired heating power of the
Der Stromsensor 18 kann beispielsweise zwischen dem Filter 30 und dem Gleichrichter 24 angeordnet sein, so dass er im Wesentlichen den niederfrequenten Wechselstrom aus dem Haushaltsstromnetz 28 mit einer Netzfrequenz von 50 Hertz misst.For example, the
Die Messanordnung 16 mit dem Stromsensor 18 misst daher eine Summe P von Eingangsleistungen der Treibereinheiten 20a, 20b. Der Eingangsstrom I des Gleichrichters 24 wird als Kenngröße für die Eingangsleistungen genutzt.The measuring
Weitere Stromsensoren 34a, 34b der Messanordnung 16 dienen zum Messen der Ströme I1, I2, welche die einzelnen Induktionsheizkörper 10a, 10b durchfließen. Die Ströme I1, I2 sind daher die tatsächlichen Heizströme der Induktionsheizkörper 10a, 10b. Wenn beide Induktionsheizkörper 10a, 10b der gleichen Heizzone 14 zugeordnet sind und vollständig von einem Topfboden eines auf der Heizzone 14 angeordneten Kochgeschirrelements überdeckt sind, sind die Ströme I1, I2 zumindest im Wesentlichen gleich und können in einer sehr guten Näherung als ein vorgegebener Bruchteil des Eingangsstroms I des Gleichrichters 24 berechnet werden.Further
Die Steuereinheit 12 nutzt die von den Stromsensoren 34a, 34b gemessenen Ströme I1, I2 der einzelnen Induktionsheizkörper 10a, 10b in der Regel nur zum Schützen der Wechselrichter 22a, 22b und zum Detektieren der Kochgeschirrelemente auf dem Induktionskochfeld. Im Normalbetrieb müssen die von den Stromsensoren 34a, 34b gewonnenen Signale keiner aufwändigen Signalverarbeitung unterzogen werden, so dass eine Komplexität der Aufgaben der Steuereinheit 12 im Vergleich zu herkömmlichen Induktionskochfeldern stark verringert werden kann.The
Zum Begrenzen der Wechselrichter-Leistung müssen die Amplituden der Ströme I1, I2 lediglich mit einem Schwellenwert verglichen werden.To limit the inverter power, the amplitudes of the currents I1, I2 need only be compared to a threshold value.
Die Steuereinheit 12 umfasst einen frei programmierbaren Prozessor und ein Betriebsprogramm, das periodisch oder nach einem Startsignal des Benutzers zunächst ein Kochgeschirr-Detektionsverfahren durchführt. Die Steuereinheit 12 detektiert dabei eine Größe und Position von auf dem Induktionskochfeld bzw. auf einer Abdeckplatte des Induktionshochfelds aufgestellten Kochgeschirrelementen und fasst Induktionsheizelemente 10, die wenigstens zu einem gewissen Grad von dem Kochgeschirrelement überdeckt sind, zu einer Heizzone 14 zusammen.The
Abhängig von einer von einem Benutzer eingestellten Heizstufe regelt die Steuereinheit 12 eine Heizleistung der Heizzone 14 auf einen von der Heizstufe abhängigen Sollwert. Dazu bildet sie eine Summe der Heizleistungen der einzelnen Induktionsheizelemente 10 und vergleicht diese Summe mit dem Sollwert.Depending on a heating level set by a user, the
Bei der Summenbildung nutzt die Steuereinheit 12 das Summensignal des Stromsensors 18, wenn alle Induktionsheizkörper 10, deren Heizleistung von dem Stromsensor 18 gemeinsam gemessen wird, der Heizzone 14 angehören. Andernfalls nutzt die Steuereinheit 12 die Stromsensoren 34a, 34b zum Bestimmen der individuellen Heizleistungen Pi.In the summation, the
Wenn nur ein Teil der durch den Stromsensor 18 zu einer Gruppe zusammengefassten Heizelemente 10 einer Heizzone 14 zugeordnet ist, die restlichen Induktionsheizelemente aber überhaupt nicht betrieben werden, nutzt die Steuereinheit 12 ebenfalls das Signal des Stromsensors 18 zum Bestimmen der Heizleistung. Im Vergleich zu Gruppen von Induktionsheizelementen, die vollständig der Heizzone 14 angehören, wird die in die Regelung einfließende Soll-Heizleistung dieser Gruppe um einen dem Anteil der aktiven Induktionsheizelemente entsprechenden Faktor reduziert.If only a portion of the grouped by the
Das oben beschriebene Induktionskochfeld bzw. die Steuereinheit 12 implementiert ein Verfahren zum Betreiben eines Induktionskochfelds mit einer Mehrzahl von Induktionsheizkörpern 10a, 10b, die flexibel zu einer Heizzone 14 gruppiert und zusammengefasst werden können. Eine von den Induktionsheizkörpern 10a, 10b erzeugte Heizleistung wird gemessen und zum Regeln des Betriebs der Induktionsheizkörper 10a, 10b genutzt.The above-described induction hob or
Dabei erfasst die Steuereinheit 12 eine Summe von Heizleistungen einer Gruppe von Induktionsheizkörpern 10a, 10b und nutzt diese Summe in einem Normalfall als Regelgröße zum Betreiben der Gruppe von Induktionsheizkörpern 10a, 10b. In Sonderfällen, in denen Induktionsheizkörper 10a, 10b unterschiedlichen Heizzonen 14 zugeordnet sind, fließen auch die Heizströme der einzelnen Induktionsheizkörper 10a, 10b als Regelparameter in das Steuerungsverfahren ein.In this case, the
Die Schaltanordnung 36 kann zumindest einzelne der Induktionsheizkörper 10a - 10e wahlweise mit einem der beiden Wechselrichter 22a, 22b verbinden, bzw. jeden der Wechselrichter 22a, 22b mit wählbaren Gruppen aus Induktionsheizelementen 10a - 10e.The switching
In dem in
Wenn der Benutzer über eine Benutzerschnittstelle eine bestimmte Heizstufe für die Heizzone 14 bereitstellt, berechnet die Steuereinheit 12 abhängig von der eingestellten Leistungsstufe und abhängig von der Größe der Heizzone 14 eine Soll-Gesamtheizleistung für die Heizzone 14. Die Steuereinheit 12 regelt die Heizleistung der Heizzone 14 auf den so bestimmten Sollwert. Dazu berechnet die Steuereinheit aus den Eingangsströmen I1, I2 der Wechselrichter 22a, 22b, die über die Stromsensoren 18a, 18b gemessen werden, eine Gesamtheizleistung der beiden Gruppen von Induktionsheizelementen 10a - 10i und berechnet durch das Isolieren der Heizleistungen der Gruppen die Gesamtheizleistung der Heizzone 14.When the user provides a particular heating level for the
Wenn die so bestimmte Gesamtheizleistung nicht mit der Soll-Heizleistung übereinstimmt, kann die Heizleistung durch eine Variation der von den Wechselrichtern 22a, 22b erzeugten Heizfrequenz in einem geschlossenen Regelkreis auf den Sollwert geregelt werden.When the total heating power thus determined does not agree with the target heating power, the heating power can be controlled to the target value by varying the heating frequency generated by the
In einer besonders einfachen Ausgestaltung der Erfindung werden die Heizelemente 10a - 10j der beiden Gruppen jeweils mit Heizströmen mit der gleichen Frequenz betrieben. Die Gruppen-Heizleistungen der beiden Gruppen stellen sich dann automatisch auf einen Wert ein, der durch die Kopplungsstärke der unterschiedlichen Induktionsheizelemente 10a - 10j an den Boden des Kochtopfs bestimmt ist. Die Steuereinheit 12 kann die Heizleistung der einzelnen Induktionsheizelemente 10a - 10j mit Hilfe von Begrenzungs-Stromsensoren der in
Ferner ist es möglich, beispielsweise durch einen getakteten Betrieb der Heizelemente 10a - 10j die Anteile der Gruppen-Heizleistungen an der Gesamtheizleistung auf vorgegebene Werte zu regeln. Dazu kann die Steuereinheit 12 durch eine Betätigung der Schaltanordnung 36 die Induktionsheizelemente 10a - 10i einer der Gruppen getaktet betreiben, oder die Wechselrichter 22a, 22b können Heizströme mit unterschiedlichen Heizfrequenzen erzeugen.Furthermore, it is possible, for example by a clocked operation of the
Die Gruppen-Heizleistungen können durch Verändern der Frequenz der Heizströme, durch eine Änderung der Amplitude der Heizströme oder durch eine geeignete Einstellung von Längen von Betriebsphasen der verschiedenen Gruppen von Heizelementen in einem getakteten Betrieb erfolgen. Die Amplitudenänderung kann durch eine Änderung der Pulsphase von Steuersignalen erreicht werden, die von der Steuereinheit 12 an die Wechselrichter 22a, 22b übermittelt werden. In einem Schritt S2 entscheidet die Steuereinheit 12, welches der oben genannten Verfahren angewandt wird. Bevorzugt wird dabei immer die simultane Änderung der Frequenz der Heizströme beider Gruppen, da dadurch Interferenzbrummen vermieden werden kann. Nur wenn bei gleicher Heizfrequenz beider Gruppen das angestrebte Verhältnis der Gruppen-Heizleistungen um mehr als einen Toleranzbereich von beispielsweise 5 % oder 10 % verfehlt wird, erfolgt die Einstellung der Gruppen-Heizleistungen über einen getakteten Betrieb der Induktionsheizelemente 10a-10i. In einem Schritt S3 sind schließlich die Betriebsparameter so verändert, dass sich die Gruppen-Heizleistung in Richtung ihres Sollwerts verändert. Anschließend springt das Verfahren zurück in den Schritt S1, um den Regelkreis zu schließen.The group heating powers may be accomplished by varying the frequency of the heating currents, by changing the amplitude of the heating currents, or by suitably adjusting lengths of operating phases of the various groups of heating elements in a timed operation. The amplitude change can be achieved by a change in the pulse phase of control signals, which are transmitted from the
Um dennoch die anteiligen Heizleistungen der beiden Heizzonen 14a, 14b bestimmen zu können, verwendet die Steuereinheit 12 ein in
- 1010
- Induktionsheizkörperinduction heater
- 10a10a
- Induktionsheizkörperinduction heater
- 10b10b
- Induktionsheizkörperinduction heater
- 10c10c
- Induktionsheizkörperinduction heater
- 10d10d
- Induktionsheizkörperinduction heater
- 10e10e
- Induktionsheizkörperinduction heater
- 1212
- Steuereinheitcontrol unit
- 1414
- Heizzoneheating zone
- 1616
- Messanordnungmeasuring arrangement
- 18a18a
- Stromsensorcurrent sensor
- 18b18b
- Stromsensorcurrent sensor
- 20a20a
- Treibereinheitdriver unit
- 20b20b
- Treibereinheitdriver unit
- 22a22a
- Wechselrichterinverter
- 22b22b
- Wechselrichterinverter
- 2424
- Gleichrichterrectifier
- 2626
- Diagrammdiagram
- 2828
- HaushaltsstromnetzHousehold power grid
- 3030
- Filterfilter
- 3232
- Diagrammdiagram
- 34b34b
- Stromsensorcurrent sensor
- 34a34a
- Stromsensorcurrent sensor
- 3636
- Schaltanordnungswitching arrangement
- PP
- Heizleistungheating capacity
- Pipi
- Heizleistungheating capacity
- II
- Stromelectricity
- I1I1
- Stromelectricity
- I2I2
- Stromelectricity
Claims (15)
- Induction hob having a plurality of induction heating elements (10), a control unit (12), which is designed to operate a number of induction heating elements (10) to heat at least one flexibly definable heating zone (14) in a synchronised manner and a measurement array (16) for measuring a heating power (P, Pi) generated by the induction heating elements (10), characterised in that the measurement array (16) is designed to measure a sum of the heating powers (P) of at least two induction heating elements (10a, 10b), wherein the control unit (12) is designed to use the sum of the heating powers (P) to regulate the heating power (P, Pi), and wherein the control unit (12) is designed to operate a number of groups of induction heating elements (10) simultaneously with an inverter (22a, 22b) in at least one operating state.
- Induction hob according to claim 1, characterised in that the measurement array (16) comprises at least one current sensor (18) for measuring a sum of the currents flowing through at least two induction heating elements (10a, 10b).
- Induction hob according to claim 2, characterised in that the current sensor (18) is designed to measure an input current of an inverter, which supplies the at least two induction heating elements (10a, 10b).
- Induction hob according to one of the preceding claims, characterised by a number of inverters (22a, 22b) for generating an alternating current voltage to supply the induction heating elements (10), wherein the measurement array (16) comprises a number of current sensors (18) for measuring an input current of each of the inverters (22a, 22b).
- Induction hob according to one of the preceding claims, characterised by a plurality of driver units (20a, 20b) assigned respectively to an induction heating element (10a, 10b), each comprising an inverter (22a, 22b) for generating a high-frequency current for operating the induction heating elements (10a, 10b), wherein the measurement array (16) is designed to measure a sum of input powers of the driver units (20a, 20b).
- Induction hob according to one of the preceding claims, characterised in that the measurement array (16) is designed also to measure values of the currents (I1, I2) flowing through the individual induction heating elements (10a, 10b).
- Induction hob according to claim 6, characterised in that the control unit (12) is designed to use values of the currents (I1, I2) of the individual induction heating elements (10a, 10b) to limit an inverter power.
- Induction hob according to one of the preceding claims, characterised in that the control unit (12) is designed to use the sum of the heating powers (P) to regulate the heating power (P, Pi), if the at least two induction heating elements (10a, 10b) are assigned to a common heating zone (14), and to use the values of the currents (I1, I2) of the individual induction heating elements (10a, 10b) to regulate the heating powers (P, Pi) of said induction heating elements (10a, 10b), if the at least two induction heating elements (10a, 10b) are assigned to different heating zones (14).
- Induction hob according to one of the preceding claims, characterised in that the at least two induction heating elements (10a, 10b) are adjacent induction heating elements (10a, 10b) in a matrix of induction heating elements (10a, 10b).
- Induction hob according to one of the preceding claims, characterised in that the measurement array (16) is designed to measure a sum of the heating powers (P) of at least four adjacent induction heating elements (10a, 10b).
- Induction hob according to one of the preceding claims, characterised in that the control unit (12) is designed to form a heating zone (14) from a number of groups of induction heating elements (10a, 10b) and to supply each of the groups from a different inverter (22a, 22b), wherein the control unit (12) uses the input currents of the inverters (22a, 22b) as the characteristic variable for the sum of the heating powers of the induction heating elements (10a, 10b) supplied by the relevant inverter (22a, 22b).
- Induction hob according to one of the preceding claims, characterised in that the control unit (12) is designed to operate a number of groups of induction heating elements (10a, 10b) with a single inverter (22a, 22b) in at least one operating state and to determine the proportion of the overall heating power contributed by one of the groups in a phase in which only the induction heating elements (10a, 10b) of this group are active.
- Induction hob according to one of the preceding claims, characterised in that the control unit (12) is designed to operate a number of groups of induction heating elements (10a, 10b) simultaneously in at least one operating state.
- Induction hob according to one of the preceding claims, characterised in that the control unit (12) is designed to operate a number of groups of induction heating elements (10a, 10b) with a single inverter (22a, 22b) and to generate different heating powers by means of a short-term periodic deactivation of at least one induction heating element (10a, 10b).
- Method for operating an induction hob having a plurality of induction heating elements (10a, 10b), which are grouped flexibly to form a heating zone (14), wherein a heating power (P, Pi) generated by the induction heating elements (10a, 10b) is measured and used to regulate the operation of the induction heating elements (10a, 10b), characterised in that a sum of heating powers (P) of at least two induction heating elements (10a, 10b) is measured and used as a control variable for operating the at least two induction heating elements (10a, 10b), wherein a number of groups of induction heating elements (10) are operated simultaneously with an inverter (22a, 22b) in at least one operating state.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP11164169.2A EP2352359B1 (en) | 2008-01-14 | 2009-01-12 | Induction hotplate with multiple induction heaters |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES200800175A ES2335256B1 (en) | 2008-01-14 | 2008-01-14 | INDUCTION COOKING FIELD WITH A PLURALITY OF INDUCTION HEATING BODIES. |
EP11164169.2A EP2352359B1 (en) | 2008-01-14 | 2009-01-12 | Induction hotplate with multiple induction heaters |
EP09701875.8A EP2236004B1 (en) | 2008-01-14 | 2009-01-12 | Induction hob comprising a plurality of induction heaters |
Related Parent Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09701875.8A Division-Into EP2236004B1 (en) | 2008-01-14 | 2009-01-12 | Induction hob comprising a plurality of induction heaters |
EP09701875.8A Division EP2236004B1 (en) | 2008-01-14 | 2009-01-12 | Induction hob comprising a plurality of induction heaters |
EP09701875.8 Division | 2009-01-12 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2352359A1 EP2352359A1 (en) | 2011-08-03 |
EP2352359B1 true EP2352359B1 (en) | 2016-08-17 |
Family
ID=40467053
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11164169.2A Active EP2352359B1 (en) | 2008-01-14 | 2009-01-12 | Induction hotplate with multiple induction heaters |
EP09701875.8A Revoked EP2236004B1 (en) | 2008-01-14 | 2009-01-12 | Induction hob comprising a plurality of induction heaters |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09701875.8A Revoked EP2236004B1 (en) | 2008-01-14 | 2009-01-12 | Induction hob comprising a plurality of induction heaters |
Country Status (4)
Country | Link |
---|---|
US (1) | US8558148B2 (en) |
EP (2) | EP2352359B1 (en) |
ES (2) | ES2335256B1 (en) |
WO (1) | WO2009090152A1 (en) |
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US10893579B2 (en) | 2017-07-18 | 2021-01-12 | Whirlpool Corporation | Method for operating an induction cooking hob and cooking hob using such method |
US10993292B2 (en) | 2017-10-23 | 2021-04-27 | Whirlpool Corporation | System and method for tuning an induction circuit |
US11140751B2 (en) | 2018-04-23 | 2021-10-05 | Whirlpool Corporation | System and method for controlling quasi-resonant induction heating devices |
US11212880B2 (en) | 2012-10-15 | 2021-12-28 | Whirlpool Emea S.P.A. | Induction cooking top |
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ES2335256B1 (en) | 2008-01-14 | 2011-01-17 | Bsh Electrodomesticos España, S.A. | INDUCTION COOKING FIELD WITH A PLURALITY OF INDUCTION HEATING BODIES. |
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KR102329134B1 (en) * | 2017-04-28 | 2021-11-19 | 삼성전자주식회사 | Cooking apparatus and control method thereof |
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ES2713379A1 (en) * | 2017-11-20 | 2019-05-21 | Bsh Electrodomesticos Espana Sa | PROCEDURE FOR ASSEMBLY OF A COOKING SYSTEM (Machine-translation by Google Translate, not legally binding) |
KR102654131B1 (en) * | 2018-12-05 | 2024-04-04 | 삼성전자주식회사 | Cooking apparatus and method for controlling thereof |
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-
2008
- 2008-01-14 ES ES200800175A patent/ES2335256B1/en not_active Revoked
-
2009
- 2009-01-12 US US12/811,553 patent/US8558148B2/en active Active
- 2009-01-12 ES ES11164169.2T patent/ES2588764T3/en active Active
- 2009-01-12 EP EP11164169.2A patent/EP2352359B1/en active Active
- 2009-01-12 EP EP09701875.8A patent/EP2236004B1/en not_active Revoked
- 2009-01-12 WO PCT/EP2009/050274 patent/WO2009090152A1/en active Application Filing
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10605464B2 (en) | 2012-10-15 | 2020-03-31 | Whirlpool Corporation | Induction cooktop |
US11212880B2 (en) | 2012-10-15 | 2021-12-28 | Whirlpool Emea S.P.A. | Induction cooking top |
US11655984B2 (en) | 2012-10-15 | 2023-05-23 | Whirlpool Corporation | Induction cooktop |
US10893579B2 (en) | 2017-07-18 | 2021-01-12 | Whirlpool Corporation | Method for operating an induction cooking hob and cooking hob using such method |
US10993292B2 (en) | 2017-10-23 | 2021-04-27 | Whirlpool Corporation | System and method for tuning an induction circuit |
US11140751B2 (en) | 2018-04-23 | 2021-10-05 | Whirlpool Corporation | System and method for controlling quasi-resonant induction heating devices |
Also Published As
Publication number | Publication date |
---|---|
WO2009090152A1 (en) | 2009-07-23 |
US20100282740A1 (en) | 2010-11-11 |
US8558148B2 (en) | 2013-10-15 |
EP2236004A1 (en) | 2010-10-06 |
ES2335256A1 (en) | 2010-03-23 |
EP2236004B1 (en) | 2017-05-10 |
ES2335256B1 (en) | 2011-01-17 |
ES2588764T3 (en) | 2016-11-04 |
EP2352359A1 (en) | 2011-08-03 |
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