EP2506673B1 - Induction cooktop - Google Patents
Induction cooktop Download PDFInfo
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- EP2506673B1 EP2506673B1 EP12161380.6A EP12161380A EP2506673B1 EP 2506673 B1 EP2506673 B1 EP 2506673B1 EP 12161380 A EP12161380 A EP 12161380A EP 2506673 B1 EP2506673 B1 EP 2506673B1
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- EP
- European Patent Office
- Prior art keywords
- operating
- section
- power
- consumer
- safety
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- 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.)
- Not-in-force
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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
Definitions
- the invention relates to a household appliance device according to the preamble of claim 1.
- Induction hobs are known in which an inverter supplies two induction heating units with power in temporal change.
- An electric power that draws an induction heating unit from the inverter depends both on a frequency of a high-frequency alternating current, with which the inverter supplies the induction heating units, as well as on a material of a Gargut alternnisses, which is to be heated with the induction heating unit from.
- Such induction hobs are for example from the documents WO 2001/139598 A1 . EP 2 173 139 A1 . US 2010/065550 A1 or EP 2 124 506 A1 known.
- the object of the invention is in particular to provide a home appliance device with a long service life.
- the object is achieved by the features of claim 1, while advantageous embodiments and modifications of the invention can be taken from the dependent claims.
- the invention is based on a household appliance device with at least one first consumer, which is intended to be operated in sections in at least one operating mode, and which in an operating section of a power converter relates to a dependent of at least one internal and at least one external operating characteristic electrical power.
- the home appliance device comprises a control unit which is provided to set the internal operating parameter to at least one safety value at the beginning of the operating section in at least one safety section.
- An "internal operating parameter" is to be understood in particular to mean a parameter of the domestic appliance device which advantageously characterizes an operating state of the domestic appliance device and which can preferably be changed at least by the control unit and / or by operating elements of the domestic appliance device.
- an “external operating parameter” is to be understood, in particular, as a characteristic which indicates an operating state of the household appliance device Characterized and which differs from an internal operating characteristic, in particular a characteristic which is dependent on properties of a cooking utensil placed in and / or on a domestic appliance, in particular a cooking surface of the domestic appliance, in particular a position and / or a material of the cooking utensil.
- a “consumer” is to be understood in particular as a unit which has at least one consumer element which converts an electrical power into another power form, preferably a heating power. In particular, in an operating state in which the consumer obtains electrical power, all consumer elements of the consumer, preferably simultaneously, receive electrical power.
- a “power converter” should be understood to mean, in particular, a unit which converts an electrical power having specific parameters, in particular a rectified mains alternating voltage, into an electrical power having other characteristics, in particular an alternating current having a frequency which is greater than a frequency of a mains alternating voltage
- An "operating section” should be understood to mean in particular a period during which a consumer obtains electrical power, in particular at least 1 W, in particular advantageously at least 10 W, particularly advantageously at least 20 W and preferably at least 50 W from the power converter.
- an operating section has a duration of at least 50 ms, advantageously at least 60 ms, and preferably at least 90 ms.
- a “control unit” is to be understood as meaning, in particular, an electronic unit which is preferably provided to control and / or regulate at least the power converter.
- the control unit preferably comprises a computing unit and, in particular in addition to the computing unit, a memory unit with a control and / or regulating program stored therein, which is intended to be executed by the computing unit.
- the term "intended” is to be understood in particular to be specially designed and / or specially equipped and / or specially programmed for this purpose.
- the security section has a duration of at least 1 ms, advantageously at least 2 ms, and preferably at least 8 ms.
- the control unit is provided to set the value of the internal operating characteristic to an operating value in a part of the operating section after the safety section.
- an "operating value” is to be understood as meaning a value of the internal operating parameter, in particular a frequency of a high-frequency alternating current, in which the consumer obtains electrical power from the power converter, with one from an operator requested active power of the consumer, in particular a desired heating power, can be achieved during the operating section and in which an operation of the power converter takes place within the load limits of the power converter.
- the control unit is provided to set the value of the internal operating parameter to at least one safety value at a beginning of the operating section of the first consumer only if the operating value of the internal operating parameter in the operating section of the first consumer is outside a safety range and / or the operating value in an immediately preceding operating section of the first consumer was outside the safety area.
- immediate preceding is to be understood in particular that temporally between the immediately preceding operating section of the first consumer and a current operating section of the first consumer only operating states of the home appliance device are different, which are different from an operating section of the first consumer.
- an immediately preceding operating section is spaced apart from an operating section for a maximum of 7 s, advantageously for a maximum of 5 s and preferably for a maximum of 2 s.
- a "safety value” is to be understood as meaning a value of the internal operating parameter in which, independently of a value of the external operating parameter, operation of the power converter can take place within load limits of the power converter.
- a "safety area” should be understood as meaning all values of the internal operating parameter which are safety values.
- “adjust” should be understood to mean that the control unit controls the power converter such that a change in the value of the internal operating characteristic to a value to be set for the internal operating parameter can be achieved.
- a long service life of the domestic appliance device can be achieved by avoiding damage to the power converter by a value of the external operating characteristic changed in an operating state before the operating section and a resulting operation of the power converter outside of load limits.
- the internal operating characteristic of an operating characteristic of the power converter in particular a performance characteristic of the power converter, in particular a frequency of a high-frequency alternating current of the power converter is formed.
- a quick adjustment of the internal operating characteristic can be achieved.
- the security section has a duration that corresponds to a maximum of 50 percent, advantageously not more than 40 percent and preferably not more than 20 percent of a duration of the operating section.
- the security section has a maximum duration of 30 ms, advantageously a maximum of 20 ms, and preferably a maximum of 17 ms.
- a long duration of the proportion of the operating section in relation to the security section can be achieved, in which the desired active power of the consumer can be achieved.
- the domestic appliance device has a sensor which is provided for measuring a performance characteristic of the power converter during the safety section.
- a “sensor” is to be understood in particular as an element, preferably an electrical component, which is provided for transferring a measured variable, in particular a performance variable, preferably a performance characteristic of a power converter, into another physical, preferably electrical, size, in particular a digital signal. where there is a one-to-one correspondence between the physical quantity and the measurand in at least one application area.
- the sensor has a signal connection to the control unit, which differs in particular from a power supply connection of the sensor.
- a “performance characteristic” should be understood to mean, in particular, an electrical parameter, preferably a magnitude of an electrical current, an electrical voltage and / or the electrical power.
- the operating value can be determined from the measurement of the performance characteristic and thus safe operation of the home appliance device can be achieved.
- the control unit is provided to adapt the internal operating parameter from a start value to the safety value in a start section.
- a "start value” is to be understood in particular as meaning a value of the internal operating parameter which is within the safety range and, in particular, is different from the safety value.
- the adaptation from the starting value to the safety value preferably takes place continuously, in particular monotone, preferably linear.
- the start value is formed from an extremal value of the safety values that the internal operation characteristic assumes in the safety section.
- the starting value is formed by an extremal value of the security area. In particular, a uniformly increasing load of the power converter during the safety section can be achieved by the starting section, whereby a long service life of the power converter and the home appliance device can be achieved.
- the starting section has a duration which corresponds in particular to a maximum of 60 percent, advantageously not more than 30 percent and preferably not more than 5 percent of the duration of the security section.
- the starting section has a duration of at least 100 ⁇ s, advantageously at least 200 ⁇ s and preferably at least 300 ⁇ s and at most 1 ms, advantageously at most 800 ⁇ s and preferably at most 700 ⁇ s.
- safe operation of the power converter at the beginning of the safety section can be achieved.
- the home appliance device has at least one second consumer, which is intended to receive electrical power from the power converter in at least one operating mode in at least one operating section, which differs in time from an operating section of the first consumer.
- the domestic appliance device has at least one switching element via which at least the first consumer and / or at least the second consumer receive electrical power from the power converter.
- the first consumer receives electrical power from the power converter via the at least one switching element.
- the second consumer receives electrical power from the power converter via the at least one switching element.
- the home appliance device has at least one third consumer, in particular at least one further power converter, and a switching arrangement which is provided, preferably by switching commands of the control unit, at least three, in particular at least six, advantageously at least ten, different combinations of at least one of the at least one Power converter and at least one of the at least three consumers to connect directly.
- the switching arrangement has at least two Switching elements, in particular both are arranged between the first load and the first power converter. Under the fact that the switching elements are arranged "between" the power converter and the consumer, should be understood in particular that in an operating condition in which the consumer is supplied with high-frequency alternating current, the consumer with the switching means in any order on a single contact, preferably a voltage tap, the power converter is arranged in series.
- the first switching element to the power converter directly connected to the first switching element, the second switching element and the second switching element of the consumer.
- a "direct connection” is to be understood in particular as meaning an electrical connection which, at least in an operating state with a current flow of alternating current via the connection with a frequency between 1 kHz and 100 kHz, has an impedance which is smaller than its magnitude 10 V / A, in particular less than 1 V / A, preferably less than 0.1 V / A and whose amount fluctuates in particular over a frequency range from 1 kHz to 100 kHz by a maximum of 10%, preferably a maximum of 3%.
- a component-saving construction of the domestic appliance device can be achieved, with in particular fewer power converters being required as consumers.
- an induction heating unit is to be understood in particular as a unit having at least one induction heating element.
- in an operating state in which the induction heating unit is supplied with high-frequency alternating current all induction heating elements of the induction heating unit, preferably simultaneously, supplied with high-frequency alternating current.
- induction heating element is to be understood in particular as a wound electrical conductor, preferably in the form of a circular disk through which high-frequency alternating current flows in at least one operating state.
- the induction heating element is preferably provided to convert electrical energy into an alternating magnetic field, which is provided in a metallic, preferably at least partially ferromagnetic, heating means, in particular cooking utensils, eddy currents and / or remagnetization effects which are converted into heat.
- heating frequency unit should in particular be understood to mean an electrical unit which generates an oscillating electrical signal, preferably at a frequency of at least 1 kHz, in particular of at least 10 kHz, advantageously of at least 20 kHz, and in particular of not more than 170 kHz for an induction heating unit ,
- the heating frequency unit is provided to provide a maximum electrical power of at least 1000 W, in particular at least 2000 W, advantageously at least 3000 W, and preferably at least 3500 W, required by the induction heating unit.
- the heating frequency unit comprises in particular at least one inverter, which preferably has at least two, preferably series-connected, bidirectional unipolar switches which are formed in particular by a transistor and a diode connected in parallel, and particularly advantageously at least one damping capacitor connected in parallel to the bidirectional unipolar switches, which is in particular formed by at least one capacitor.
- a high-frequency power supply of the induction heating unit can be provided.
- a voltage tap of the radio-frequency unit is arranged in particular at a common contact point of two bidirectional unipolar switches.
- an induction heater with a long service life can be provided.
- the domestic appliance is designed as a hob, preferably as an induction hob, and / or in particular as an oven, preferably an induction oven, with in particular a hob device, preferably an induction hob device.
- Fig. 1 shows a designed as an induction hob home appliance 10 with a designed as an induction hob device household appliance device 12 with four formed as induction heating units consumers 20, 22, 24, 26, each having a designed as an inductor load element.
- the consumers 20, 22, 24, 26 are arranged under a hob plate 14.
- the domestic appliance device 12 has a power module 18 operated by a single phase 16 of a three-phase domestic connection, which is provided to supply the consumers 20, 22, 24, 26 with high-frequency alternating current with a frequency between 20 kHz and 170 kHz.
- the power module 18 has two power converters 30, 32, which are intended to be operated via the single phase 16 and to supply the loads 20, 22, 24, 26 ( Fig. 2 ).
- the frequency of the power converters 30, 32 depends inter alia on a heating power demanded for the loads 20, 22, 24, 26 via an operating unit 28 and a cooking utensil which is arranged in a cooking zone on the hob plate 14 above the consumer 20, 22, 24, 26 is arranged.
- the home appliance device 12 has a control unit 34, which among other things determines the frequency of the power converters 30, 32.
- the control unit 34 has an arithmetic unit, a memory unit and an operating program stored in the memory unit, which is intended to be executed by the arithmetic unit.
- FIG. 2 shows the trained as induction hob device household appliance device 12 in a schematic representation.
- a voltage applied to a phase 16 between 220 V and 230 V mains voltage with a network frequency between 49 Hz and 51 Hz is rectified in a rectifier 36 and stored in a buffer capacity 38 partially.
- the poles of the buffer capacitor 38 form two external contacts 40, 42 between which a pulsating DC voltage is applied.
- the power converters 30, 32 are arranged between the external contacts 40, 42 and convert the pulsating DC voltage into high-frequency alternating current.
- the power converters 30, 32 each have two switching elements 44, 46 which are connected in series between the external contacts 40, 42 and designed as bidirectional unipolar switches, each having a parallel-connected damping capacitor 48, 50.
- the switching elements 44, 46 are each formed by an IGBT 52, 54 (insulated gate bipolar transistor) and a parallel connected diode 56, 58.
- a voltage tap 60, 62 is arranged in each case at a common contact of the two IGBTs 52, 54.
- the control unit 34 causes by alternating, high-frequency control of the two IGBTs 52, 54 at the voltage tap 60 a high-frequency alternating voltage with pulsating amplitude, which follows a high-frequency alternating current when connecting a consumer 20, 22, 24, 26.
- the voltage taps 60, 62 of the power converters 30, 32 are connected to a switching arrangement 64 having six relay elements formed switching elements 66, 68, 70, 72, 74, 76, which are designed as a single pole changeover switch, and by switching commands of the control unit 34 thereto it is intended to directly connect 16 different combinations of up to two of the two power converters 30, 32 and up to two of the four loads 20, 22, 24, 26.
- switching elements 66, 68, 70, 72, 74, 76 each have three contacts and two switching states.
- the first contact In a first switching state, the first contact is directly connected to the second contact and in a second switching state, the first and the third contact are directly connected (in the illustration, the first contact is arranged on the left and the second contact on the top right).
- the switching elements 66, 68, 70, 72, 74, 76 are arranged in a cascaded circuit.
- a first contact of the switching element 66 is directly connected to the voltage tap 60 of the power converter 30.
- a second and a third contact of the switching element 66 is in each case directly connected to a first contact of the two switching elements 68, 70.
- the consumers 20, 22, 24, 26 are each directly connected to one of the second or third contacts of the switching elements 68, 70.
- each of the loads 20, 22, 24, 26 can thus be directly connected to each of the power converters 30, 32 by suitable switching states of the switching elements 66, 68, 70, 72, 74, 76. Furthermore, any two of the loads 20, 22, 24, 26 may be directly connected to different power converters 30, 32 simultaneously. Likewise, for each of the consumers 20, 22, 24, 26, a boost operation in which a single load 20, 22, 24, 26 is directly connected to both power converters 30, 32 simultaneously is possible. The consumers 20, 22, 24, 26 are each operated in half-bridge circuit.
- Consumers 20, 22, 24, 26 each have a common contact 78, 79 which is in each case connected directly to a resonance unit 80, 81 which is formed by two resonance capacitances 82, 84 and 83, 85 formed from individual capacitors.
- the resonant capacitances 82, 84 and 83, 85 are each connected in series and one of the resonant capacitances 82, 83 is connected directly to one of the external contacts 40 and the other of the resonant capacitors 84, 85 is connected directly to the other external contact 42.
- Both of the resonance capacitances 82, 84 and 83, 85 are each connected directly to the two loads 20, 22 and 24, 26, respectively.
- the home appliance device 12 thus has a control unit 34, a first and a second load 20, 22 and a first and a second power converter 30, 32, which in an operating mode in which the first load 20 is connected directly to the first power converter 30 and the second load 22 is connected directly to the second power converter 32 via which two loads 20, 22 are connected. Furthermore, it is possible for the power converters 30, 32 to be connected via the third and the fourth consumers 24, 26. Furthermore, the domestic appliance device 12 has two sensors 86, 88, which are provided for determining a performance characteristic. The performance characteristic is formed by a peak value of a current flowing across the voltage tap 60, 62 of the power converters 30, 32.
- the sensors 86, 88 are formed as an ammeter with analog-to-digital converters, each connected directly to the voltage tap 60, 62 of the power converter 30, 32 and the first contact of the switching elements 66, 72 of the switching device 64 and thus between a consumer 20, 22nd , 24, 26 and a power converter 30, 32 are arranged.
- FIG. 3 shows in a diagram a schematic representation of an exemplary profile of the frequency f of a high-frequency alternating current, the first consumer 20 and the second consumer 22 relate from the power converter 30, in Depending on a time t and in another diagram is a schematic representation of an exemplary course of the power P, which the consumers 20, 22 relate to the power converter 30, as a function of the time t.
- the diagrams represent a section of an exemplary operating mode of the domestic appliance device 12 according to the invention. In this exemplary operating mode, the first consumer 20 and the second consumer 22 are operated in sections, with operating sections 90, 94 of the consumers 20, 22 being free of overlapping.
- the load 20, 22 receives an electric power from the power converter 30, which is dependent on an internal operating characteristic and on an external operating characteristic.
- the internal operating characteristic is determined by an operating characteristic of the power converter 30, a frequency f of the high-frequency alternating current the consumer 20, 22 of the power converter 30, formed.
- the external operating characteristic is in each case formed by a coupling of the consumer 20, 22 with a cooking utensil which is set up on a heating zone associated with the consumer 20, 22, which depends on material properties of the cooking utensil and a position of the cooking utensil on the heating zone.
- the frequency f of the high-frequency alternating current is adjusted by the control unit 34 during a safety section 91 in a start section 92 from a start value f START1 of 170 kHz to a safety value f S1 of 35 kHz.
- the operating section 90 of the first load 20 has a duration of 93 ms, the safety section 91 a duration of 16.5 ms, ie 17.7% of the duration of the operating section 90, and the start section 92 has a duration of 350 ⁇ s, ie 2 , 1 percent of a duration of the security section 91.
- the frequency f of the high-frequency alternating current is set from the safety value f S1 of 35 kHz to an operating value f Op1 of 25 kHz via the control unit 34.
- the control unit 34 adjusts the frequency f of the high-frequency alternating current from the operating value f Op1 of 25 kHz to a stop value f STOP1 of 130 kHz.
- the following switching section 93 which has a duration of 7 ms, no high-frequency alternating current is generated by the power converter 30.
- the switching arrangement 64 is switched over from a connection of the power converter 30 to the first load 20 to a connection of the power converter 30 to the second load 22 Following operation section 94 of the second consumer 22, a security section 95 is switched by the control unit 34.
- the operating section 94 has a duration of 1893 ms, the security section 95 a duration of 16.5 ms, ie 0.08% of the duration of the operating section 94.
- the frequency f of the high-frequency alternating current becomes the second consumer 22 receives from the power converter 30, f in a start portion 96 from a starting value START2 of 170 kHz to a safety value of f S2 of 35 kHz adjusted.
- the start section 96 has a duration of 700 ⁇ s, ie 4.2 percent of the duration of the safety section 95.
- the frequency f of the high-frequency alternating current from the safety value f S2 of 35 kHz to the operating value f Op2 of FIG kHz adjusted.
- the frequency f of the high-frequency alternating current is adjusted by the control unit 34 from the operating value f Op2 of 29 kHz to a stop value f STOP2 of 120 kHz.
- a switching section not shown in the diagram, in which, as in the switching section 93, a power supply through the power converter 30 is interrupted and in which a switching of the switching arrangement 64 from the connection of the power converter 30 with the second load 22 to the connection of the power converter 30 takes place with the first consumer 20, whereupon repeats the sequence shown schematically in the diagram.
- Such a repetition of the schematically illustrated process takes place periodically with a period of 2 s.
- other modes of operation are possible in which a different number of consumers, in particular one, three or more, are operated in temporally spaced-apart operating sections.
- other values of the frequencies, in particular other safety values are possible. In particular, the safety values depend on the parameters of the consumer.
- FIG. 4 schematically illustrates an exemplary course of the power P of a circuit comprising the power converter 30 and at least the load 20, depending on the frequency f of the high-frequency alternating current of the power converter 30, the first load 20 from the power converter 30 relates and in response to a Coupling to a cooking utensil, which is positioned on the first consumer associated heating zone.
- the exemplary course is shown in three different curves 1, 2 and 3 for several different cookware, which, due to different properties, such as different material properties or different sizes of cookware, have a different coupling to the circuit.
- the power P as a function of the frequency f, a safety value f S of the frequency f is drawn.
- the maximum power P max is plotted, which characterizes an operation of the power converter 30 within load limits.
- a power of the power converter 30 may briefly exceed the maximum power P max before damage to the power converter 30 occurs.
- a safety section is switched by the control unit 34 in which the frequency f has a safety value f S.
- the safety frequency f S is higher than the cut-off frequencies f ZVS1 , f ZVS2 , and f ZVS3 , so that a safe operation of the power converter 30 is ensured when a replacement of the cookware.
- the sensor 86 performs a measurement of the peak value of the current flowing through the voltage tap 60 of the power converter 30 during the safety section (FIG. FIG. 2 ). This peak value is lower due to the power drop than a peak that would be measured at a power curve after the curve 2.
- the control unit 34 determines from the measured peak value a value for a changed operating frequency with which a heating power requested by an operator via the operating unit 28 and a safe operation of the power converter 30 can be achieved.
- the control unit 34 determines a new operating frequency with which the heating power requested by the operator via the operating unit 28 during the operating section and reliable operation of the power converter 30 are achieved can.
- safety values are also possible in which, when replacing the cooking utensils, the power occurring in the safety section is higher than without replacement of the cooking utensils, but the limit frequency f ZVS is not exceeded.
- a starting section in which a value of the frequency f is adjusted from a starting value to the operating value when a security section is omitted.
Description
Die Erfindung geht aus von einer Hausgerätevorrichtung nach dem Oberbegriff des Anspruchs 1.The invention relates to a household appliance device according to the preamble of
Es sind Induktionskochfelder bekannt, bei denen ein Wechselrichter im zeitlichen Wechsel zwei Induktionsheizeinheiten mit Strom versorgt. Eine elektrische Leistung, die eine Induktionsheizeinheit von dem Inverter bezieht, hängt dabei sowohl von einer Frequenz eines hochfrequenten Wechselstroms, mit dem der Inverter die Induktionsheizeinheiten versorgt, als auch von einem Material eines Gargutbehältnisses, welches mit der Induktionsheizeinheit erwärmt werden soll, ab.Induction hobs are known in which an inverter supplies two induction heating units with power in temporal change. An electric power that draws an induction heating unit from the inverter depends both on a frequency of a high-frequency alternating current, with which the inverter supplies the induction heating units, as well as on a material of a Gargutbehältnisses, which is to be heated with the induction heating unit from.
Solche Induktionskochfelder sind zum Beispiel aus den Dokumenten
Die Aufgabe der Erfindung besteht insbesondere darin, eine Hausgerätevorrichtung mit einer hohen Lebensdauer bereitzustellen. Die Aufgabe wird erfindungsgemäß durch die Merkmale des Patentanspruchs 1 gelöst, während vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung den Unteransprüchen entnommen werden können.The object of the invention is in particular to provide a home appliance device with a long service life. The object is achieved by the features of
Die Erfindung geht aus von einer Hausgerätevorrichtung mit zumindest einem ersten Verbraucher, der dazu vorgesehen ist, in zumindest einem Betriebsmodus abschnittsweise betrieben zu werden, und der in einem Betriebsabschnitt von einem Leistungswandler eine von zumindest einer internen und zumindest einer externen Betriebskenngröße abhängige elektrische Leistung bezieht.The invention is based on a household appliance device with at least one first consumer, which is intended to be operated in sections in at least one operating mode, and which in an operating section of a power converter relates to a dependent of at least one internal and at least one external operating characteristic electrical power.
Es wird vorgeschlagen, dass die Hausgerätevorrichtung eine Steuereinheit umfasst, welche dazu vorgesehen ist, zu Beginn des Betriebsabschnitts in zumindest einem Sicherheitsabschnitt die interne Betriebskenngröße auf wenigstens einen Sicherheitswert einzustellen. Unter einer "internen Betriebskenngröße" soll insbesondere eine Kenngröße der Hausgerätevorrichtung verstanden werden, welche vorteilhaft einen Betriebszustand der Hausgerätevorrichtung charakterisiert und welche vorzugsweise zumindest durch die Steuereinheit und/oder über Bedienelemente der Hausgerätevorrichtung verändert werden kann. Unter einer "externen Betriebskenngröße" soll insbesondere eine Kenngröße verstanden werden, welche einen Betriebszustand der Hausgerätevorrichtung charakterisiert und welche sich von einer internen Betriebskenngröße unterscheidet, insbesondere eine Kenngröße, die von Eigenschaften eines in und/oder auf einem Hausgerät, insbesondere auf einer Kochfläche des Hausgeräts, platzierten Gargutbehältnisses, insbesondere einer Position und/oder einem Material des Gargutbehältnisses, abhängig ist. Unter einem "Verbraucher" soll insbesondere eine Einheit verstanden werden, welche zumindest ein Verbraucherelement aufweist, das eine elektrische Leistung in eine andere Leistungsform, vorzugsweise eine Heizleistung, umwandelt. Insbesondere beziehen in einem Betriebszustand, in dem der Verbraucher elektrische Leistung bezieht, alle Verbraucherelemente des Verbrauchers, vorzugsweise gleichzeitig, elektrische Leistung. Unter einem "Leistungswandler" soll insbesondere eine Einheit verstanden werden, welche eine elektrische Leistung mit bestimmten Kenngrößen, insbesondere eine gleichgerichtete Netzwechselspannung, in eine elektrische Leistung mit anderen Kenngrößen, insbesondere einen Wechselstrom mit einer Frequenz, welche größer ist als eine Frequenz einer Netzwechselspannung, umformt. Unter einem "Betriebsabschnitt" soll insbesondere ein Zeitraum verstanden werden, während dem ein Verbraucher elektrische Leistung, insbesondere zumindest 1 W, insbesondere vorteilhaft zumindest 10 W, besonders vorteilhaft zumindest 20 W und vorzugsweise zumindest 50 W von dem Leistungswandler bezieht. Ein Betriebsabschnitt weist insbesondere eine Dauer von zumindest 50 ms, vorteilhaft zumindest 60 ms und vorzugsweise zumindest 90 ms auf. Unter einer "Steuereinheit" soll insbesondere eine elektronische Einheit verstanden werden, die vorzugsweise dazu vorgesehen ist, zumindest den Leistungswandler zu steuern und/oder zu regeln. Vorzugsweise umfasst die Steuereinheit eine Recheneinheit und insbesondere zusätzlich zur Recheneinheit eine Speichereinheit mit einem darin gespeicherten Steuer- und/oder Regelprogramm, das dazu vorgesehen ist, von der Recheneinheit ausgeführt zu werden. Unter "vorgesehen" soll insbesondere speziell dafür ausgelegt und/oder speziell dafür ausgestattet und/oder speziell dafür programmiert verstanden werden. Der Sicherheitsabschnitt weist insbesondere eine Dauer von zumindest 1 ms, vorteilhaft zumindest 2 ms und vorzugsweise zumindest 8 ms auf. Vorzugsweise ist die Steuereinheit dazu vorgesehen, in einem Teil des Betriebsabschnitts nach dem Sicherheitsabschnitt den Wert der internen Betriebskenngröße auf einen Betriebswert einzustellen. Insbesondere soll unter einem "Betriebswert" ein Wert der internen Betriebskenngröße, wie insbesondere eine Frequenz eines hochfrequenten Wechselstroms, verstanden werden, bei dem der Verbraucher eine elektrische Leistung von dem Leistungswandler bezieht, mit der eine von einem Bediener angeforderte Wirkleistung des Verbrauchers, insbesondere eine gewünschte Heizleistung, während des Betriebsabschnitts erreicht werden kann und bei dem ein Betrieb des Leistungswandlers innerhalb der Belastungsgrenzen des Leistungswandlers erfolgt. Vorzugsweise ist die Steuereinheit dazu vorgesehen, zu einem Beginn des Betriebsabschnitts des ersten Verbrauchers nur dann in einem Sicherheitsabschnitt den Wert der internen Betriebskenngröße auf zumindest einen Sicherheitswert einzustellen, wenn der Betriebswert der internen Betriebskenngröße in dem Betriebsabschnitt des ersten Verbrauchers außerhalb eines Sicherheitsbereichs liegt und/oder der Betriebswert in einem unmittelbar vorhergehenden Betriebsabschnitt des ersten Verbrauchers außerhalb des Sicherheitsbereichs lag. Unter "unmittelbar vorhergehend" soll insbesondere verstanden werden, dass zeitlich zwischen dem unmittelbar vorhergehenden Betriebsabschnitt des ersten Verbrauchers und einem gegenwärtigen Betriebsabschnitt des ersten Verbrauchers nur Betriebszustände der Hausgerätevorrichtung liegen, welche von einem Betriebsabschnitt des ersten Verbrauchers verschieden sind. Insbesondere ist ein unmittelbar vorhergehender Betriebsabschnitt von einem Betriebsabschnitt maximal 7 s, vorteilhaft maximal 5 s und vorzugsweise maximal 2 s beabstandet. Insbesondere soll unter einem "Sicherheitswert" ein Wert der internen Betriebskenngröße verstanden werden, bei dem unabhängig von einem Wert der externen Betriebskenngröße ein Betrieb des Leistungswandlers innerhalb von Belastungsgrenzen des Leistungswandlers erfolgen kann. Insbesondere sollen unter einem "Sicherheitsbereich" alle Werte der internen Betriebskenngröße verstanden werden, welche Sicherheitswerte sind. Insbesondere soll unter "einstellen" verstanden werden, dass die Steuereinheit den Leistungswandler derart ansteuert, dass eine Veränderung des Werts der internen Betriebskenngröße auf einen einzustellenden Wert der internen Betriebskenngröße erreicht werden kann. Insbesondere kann eine hohe Lebensdauer der Hausgerätevorrichtung erreicht werden, indem eine Beschädigung des Leistungswandlers durch einen, in einem Betriebszustand vor dem Betriebsabschnitt, geänderten Wert der externen Betriebskenngröße und einen daraus resultierenden Betrieb des Leistungswandlers außerhalb von Belastungsgrenzen vermieden werden kann.It is proposed that the home appliance device comprises a control unit which is provided to set the internal operating parameter to at least one safety value at the beginning of the operating section in at least one safety section. An "internal operating parameter" is to be understood in particular to mean a parameter of the domestic appliance device which advantageously characterizes an operating state of the domestic appliance device and which can preferably be changed at least by the control unit and / or by operating elements of the domestic appliance device. An "external operating parameter" is to be understood, in particular, as a characteristic which indicates an operating state of the household appliance device Characterized and which differs from an internal operating characteristic, in particular a characteristic which is dependent on properties of a cooking utensil placed in and / or on a domestic appliance, in particular a cooking surface of the domestic appliance, in particular a position and / or a material of the cooking utensil. A "consumer" is to be understood in particular as a unit which has at least one consumer element which converts an electrical power into another power form, preferably a heating power. In particular, in an operating state in which the consumer obtains electrical power, all consumer elements of the consumer, preferably simultaneously, receive electrical power. A "power converter" should be understood to mean, in particular, a unit which converts an electrical power having specific parameters, in particular a rectified mains alternating voltage, into an electrical power having other characteristics, in particular an alternating current having a frequency which is greater than a frequency of a mains alternating voltage , An "operating section" should be understood to mean in particular a period during which a consumer obtains electrical power, in particular at least 1 W, in particular advantageously at least 10 W, particularly advantageously at least 20 W and preferably at least 50 W from the power converter. In particular, an operating section has a duration of at least 50 ms, advantageously at least 60 ms, and preferably at least 90 ms. A "control unit" is to be understood as meaning, in particular, an electronic unit which is preferably provided to control and / or regulate at least the power converter. The control unit preferably comprises a computing unit and, in particular in addition to the computing unit, a memory unit with a control and / or regulating program stored therein, which is intended to be executed by the computing unit. The term "intended" is to be understood in particular to be specially designed and / or specially equipped and / or specially programmed for this purpose. In particular, the security section has a duration of at least 1 ms, advantageously at least 2 ms, and preferably at least 8 ms. Preferably, the control unit is provided to set the value of the internal operating characteristic to an operating value in a part of the operating section after the safety section. In particular, an "operating value" is to be understood as meaning a value of the internal operating parameter, in particular a frequency of a high-frequency alternating current, in which the consumer obtains electrical power from the power converter, with one from an operator requested active power of the consumer, in particular a desired heating power, can be achieved during the operating section and in which an operation of the power converter takes place within the load limits of the power converter. Preferably, the control unit is provided to set the value of the internal operating parameter to at least one safety value at a beginning of the operating section of the first consumer only if the operating value of the internal operating parameter in the operating section of the first consumer is outside a safety range and / or the operating value in an immediately preceding operating section of the first consumer was outside the safety area. By "immediately preceding" is to be understood in particular that temporally between the immediately preceding operating section of the first consumer and a current operating section of the first consumer only operating states of the home appliance device are different, which are different from an operating section of the first consumer. In particular, an immediately preceding operating section is spaced apart from an operating section for a maximum of 7 s, advantageously for a maximum of 5 s and preferably for a maximum of 2 s. In particular, a "safety value" is to be understood as meaning a value of the internal operating parameter in which, independently of a value of the external operating parameter, operation of the power converter can take place within load limits of the power converter. In particular, a "safety area" should be understood as meaning all values of the internal operating parameter which are safety values. In particular, "adjust" should be understood to mean that the control unit controls the power converter such that a change in the value of the internal operating characteristic to a value to be set for the internal operating parameter can be achieved. In particular, a long service life of the domestic appliance device can be achieved by avoiding damage to the power converter by a value of the external operating characteristic changed in an operating state before the operating section and a resulting operation of the power converter outside of load limits.
Weiterhin wird vorgeschlagen, dass die interne Betriebskenngröße von einer Betriebskenngröße des Leistungswandlers, insbesondere einer Leistungskenngröße des Leistungswandlers, insbesondere einer Frequenz eines hochfrequenten Wechselstroms des Leistungswandlers, gebildet ist. Insbesondere kann eine schnelle Einstellung der internen Betriebskenngröße erreicht werden.Furthermore, it is proposed that the internal operating characteristic of an operating characteristic of the power converter, in particular a performance characteristic of the power converter, in particular a frequency of a high-frequency alternating current of the power converter is formed. In particular, a quick adjustment of the internal operating characteristic can be achieved.
Weiterhin wird vorgeschlagen, dass der Sicherheitsabschnitt eine Dauer aufweist, die maximal 50 Prozent, vorteilhaft maximal 40 Prozent und vorzugsweise maximal 20 Prozent einer Dauer des Betriebsabschnitts entspricht. Insbesondere weist der Sicherheitsabschnitt eine Dauer von maximal 30 ms, vorteilhaft maximal 20 ms und vorzugsweise maximal 17 ms auf. Insbesondere kann eine im Verhältnis zu dem Sicherheitsabschnitt lange Dauer des Anteils des Betriebsabschnitts erreicht werden, in welchem die gewünschte Wirkleistung des Verbrauchers erreicht werden kann.Furthermore, it is proposed that the security section has a duration that corresponds to a maximum of 50 percent, advantageously not more than 40 percent and preferably not more than 20 percent of a duration of the operating section. In particular, the security section has a maximum duration of 30 ms, advantageously a maximum of 20 ms, and preferably a maximum of 17 ms. In particular, a long duration of the proportion of the operating section in relation to the security section can be achieved, in which the desired active power of the consumer can be achieved.
Ferner wird vorgeschlagen, dass die erfindungsgemäße Hausgerätevorrichtung einen Sensor aufweist, der zu einer Messung einer Leistungskenngröße des Leistungswandlers während des Sicherheitsabschnitts vorgesehen ist. Unter einem "Sensor" soll insbesondere ein Element, vorzugsweise ein elektrisches Bauteil, verstanden werden, das dazu vorgesehen ist, eine Messgröße, insbesondere eine Leistungskenngröße, vorzugsweise eine Leistungskenngröße eines Leistungswandlers, in eine andere physikalische, vorzugsweise elektrische Größe, insbesondere ein digitales Signal, umzuwandeln, wobei zwischen der physikalischen Größe und der Messgröße in zumindest einem Anwendungsbereich ein eineindeutiger Zusammenhang besteht. Vorzugsweise weist der Sensor eine Signalverbindung zu der Steuereinheit auf, die sich insbesondere von einer Stromversorgungsverbindung des Sensors unterscheidet. Unter einer "Leistungskenngröße" soll insbesondere eine elektrische Kenngröße, vorzugsweise eine Größe eines elektrischen Stroms, einer elektrischen Spannung und/oder der elektrischen Leistung verstanden werden. Insbesondere kann der Betriebswert aus der Messung der Leistungskenngröße bestimmt und somit ein sicherer Betrieb der Hausgerätevorrichtung erreicht werden.It is also proposed that the domestic appliance device according to the invention has a sensor which is provided for measuring a performance characteristic of the power converter during the safety section. A "sensor" is to be understood in particular as an element, preferably an electrical component, which is provided for transferring a measured variable, in particular a performance variable, preferably a performance characteristic of a power converter, into another physical, preferably electrical, size, in particular a digital signal. where there is a one-to-one correspondence between the physical quantity and the measurand in at least one application area. Preferably, the sensor has a signal connection to the control unit, which differs in particular from a power supply connection of the sensor. A "performance characteristic" should be understood to mean, in particular, an electrical parameter, preferably a magnitude of an electrical current, an electrical voltage and / or the electrical power. In particular, the operating value can be determined from the measurement of the performance characteristic and thus safe operation of the home appliance device can be achieved.
Weiterhin wird vorgeschlagen, dass die Steuereinheit dazu vorgesehen ist, in einem Startabschnitt die interne Betriebskenngröße von einem Startwert auf den Sicherheitswert anzupassen. Unter einem "Startwert" soll insbesondere ein Wert der internen Betriebskenngröße verstanden werden, welcher in dem Sicherheitsbereich liegt und insbesondere von dem Sicherheitswert verschieden ist. Vorzugsweise erfolgt die Anpassung von dem Startwert auf den Sicherheitswert kontinuierlich, insbesondere monoton, vorzugsweise linear. Vorzugsweise ist der Startwert von einem Extremalwert der Sicherheitswerte, welche die interne Betriebskenngröße in dem Sicherheitsabschnitt annimmt, gebildet. Vorzugsweise ist der Startwert von einem Extremalwert des Sicherheitsbereichs gebildet. Insbesondere kann durch den Startabschnitt eine gleichmäßig ansteigende Belastung des Leistungswandlers während des Sicherheitsabschnitts erreicht werden, wodurch eine große Lebensdauer des Leistungswandlers und der Hausgerätevorrichtung erreicht werden kann.Furthermore, it is proposed that the control unit is provided to adapt the internal operating parameter from a start value to the safety value in a start section. A "start value" is to be understood in particular as meaning a value of the internal operating parameter which is within the safety range and, in particular, is different from the safety value. The adaptation from the starting value to the safety value preferably takes place continuously, in particular monotone, preferably linear. Preferably, the start value is formed from an extremal value of the safety values that the internal operation characteristic assumes in the safety section. Preferably, the starting value is formed by an extremal value of the security area. In particular, a uniformly increasing load of the power converter during the safety section can be achieved by the starting section, whereby a long service life of the power converter and the home appliance device can be achieved.
Weiterhin wird vorgeschlagen, dass der Startabschnitt eine Dauer aufweist, die insbesondere maximal 60 Prozent, vorteilhaft maximal 30 Prozent und vorzugsweise maximal 5 Prozent der Dauer des Sicherheitsabschnitts entspricht. Insbesondere weist der Startabschnitt eine Dauer von zumindest 100 µs, vorteilhaft mindestens 200 µs und vorzugsweise mindestens 300 µs und maximal 1ms, vorteilhaft maximal 800 µs und vorzugsweise maximale 700 µs auf. Insbesondere kann ein sicherer Betrieb des Leistungswandlers am Beginn des Sicherheitsabschnitts erreicht werden.Furthermore, it is proposed that the starting section has a duration which corresponds in particular to a maximum of 60 percent, advantageously not more than 30 percent and preferably not more than 5 percent of the duration of the security section. In particular, the starting section has a duration of at least 100 μs, advantageously at least 200 μs and preferably at least 300 μs and at most 1 ms, advantageously at most 800 μs and preferably at most 700 μs. In particular, safe operation of the power converter at the beginning of the safety section can be achieved.
Ferner wird vorgeschlagen, dass die Hausgerätevorrichtung zumindest einen zweiten Verbraucher aufweist, der dazu vorgesehen ist, in zumindest einem Betriebsmodus in zumindest einem Betriebsabschnitt, der sich zeitlich von einem Betriebsabschnitt des ersten Verbrauchers unterscheidet, von dem Leistungswandler elektrische Leistung zu beziehen. Vorzugsweise weist die Hausgerätevorrichtung zumindest ein Schaltelement auf, über das zumindest der erste Verbraucher und/oder zumindest der zweite Verbraucher von dem Leistungswandler elektrische Leistung beziehen. Vorzugsweise bezieht in einem Betriebsabschnitt des ersten Verbrauchers nur der erste Verbraucher elektrische Leistung über das zumindest eine Schaltelement von dem Leistungswandler. Vorzugsweise bezieht in einem Betriebsabschnitt des zweiten Verbrauchers nur der zweite Verbraucher über das zumindest eine Schaltelement elektrische Leistung von dem Leistungswandler. Vorzugsweise weist die Hausgerätevorrichtung zumindest einen dritten Verbraucher, insbesondere zumindest einen weiteren Leistungswandler, und eine Schaltanordnung auf, die dazu vorgesehen ist, vorzugsweise durch Schaltbefehle der Steuereinheit, zumindest drei, insbesondere zumindest sechs, vorteilhaft zumindest zehn, unterschiedliche Kombinationen von wenigstens einem des zumindest einen Leistungswandlers und zumindest einem der zumindest drei Verbraucher direkt miteinander zu verbinden. Insbesondere weist die Schaltanordnung zumindest zwei Schaltelemente auf, die insbesondere beide zwischen dem ersten Verbraucher und dem ersten Leistungswandler angeordnet sind. Darunter, dass die Schaltelemente "zwischen" dem Leistungswandler und dem Verbraucher angeordnet sind, soll insbesondere verstanden werden, dass in einem Betriebszustand, in dem der Verbraucher mit hochfrequentem Wechselstrom versorgt wird, der Verbraucher mit den Schaltmitteln in beliebiger Reihenfolge an einem einzelnen Kontakt, vorzugsweise einem Spannungsabgriff, des Leistungswandlers in Reihenschaltung angeordnet ist. Vorzugsweise ist in einem beliebigen Betriebszustand das erste Schaltelement mit dem Leistungswandler, mit dem ersten Schaltelement das zweite Schaltelement und mit dem zweiten Schaltelement der Verbraucher direkt verbunden. Unter einer "direkten Verbindung" soll insbesondere eine elektrische Verbindung verstanden werden, die, zumindest in einem Betriebszustand mit einem Stromfluss von Wechselstrom über die Verbindung mit einer Frequenz zwischen 1 kHz und 100 kHz, eine Impedanz aufweist, die von ihrem Betrag her kleiner ist als 10 V/A, insbesondere kleiner ist als 1 V/A, vorzugsweise kleiner ist als 0,1 V/A und deren Betrag insbesondere über einen Frequenzbereich von 1 kHz bis 100 kHz um maximal 10 %, vorzugsweise maximal 3 % schwankt. Insbesondere kann eine Bauteile einsparende Konstruktion der Hausgerätevorrichtung erreicht werden, wobei insbesondere weniger Leistungswandler als Verbraucher benötigt werden.It is further proposed that the home appliance device has at least one second consumer, which is intended to receive electrical power from the power converter in at least one operating mode in at least one operating section, which differs in time from an operating section of the first consumer. Preferably, the domestic appliance device has at least one switching element via which at least the first consumer and / or at least the second consumer receive electrical power from the power converter. Preferably, in an operating section of the first consumer, only the first consumer receives electrical power from the power converter via the at least one switching element. Preferably, in an operating section of the second consumer, only the second consumer receives electrical power from the power converter via the at least one switching element. Preferably, the home appliance device has at least one third consumer, in particular at least one further power converter, and a switching arrangement which is provided, preferably by switching commands of the control unit, at least three, in particular at least six, advantageously at least ten, different combinations of at least one of the at least one Power converter and at least one of the at least three consumers to connect directly. In particular, the switching arrangement has at least two Switching elements, in particular both are arranged between the first load and the first power converter. Under the fact that the switching elements are arranged "between" the power converter and the consumer, should be understood in particular that in an operating condition in which the consumer is supplied with high-frequency alternating current, the consumer with the switching means in any order on a single contact, preferably a voltage tap, the power converter is arranged in series. Preferably, in any operating state, the first switching element to the power converter, directly connected to the first switching element, the second switching element and the second switching element of the consumer. A "direct connection" is to be understood in particular as meaning an electrical connection which, at least in an operating state with a current flow of alternating current via the connection with a frequency between 1 kHz and 100 kHz, has an impedance which is smaller than its magnitude 10 V / A, in particular less than 1 V / A, preferably less than 0.1 V / A and whose amount fluctuates in particular over a frequency range from 1 kHz to 100 kHz by a maximum of 10%, preferably a maximum of 3%. In particular, a component-saving construction of the domestic appliance device can be achieved, with in particular fewer power converters being required as consumers.
Es wird weiterhin vorgeschlagen, dass zumindest der erste Verbraucher von einer Induktionsheizeinheit und der Leistungswandler von einer Heizfrequenzeinheit gebildet sind. Unter einer "Induktionsheizeinheit" soll insbesondere eine Einheit mit zumindest einem Induktionsheizelement verstanden werden. Insbesondere werden in einem Betriebszustand, in dem die Induktionsheizeinheit mit hochfrequentem Wechselstrom versorgt wird, alle Induktionsheizelemente der Induktionsheizeinheit, vorzugsweise gleichzeitig, mit hochfrequentem Wechselstrom versorgt. Unter einem "Induktionsheizelement" soll insbesondere ein gewickelter elektrischer Leiter verstanden werden, vorzugsweise in Form einer Kreisscheibe, der in zumindest einem Betriebszustand von hochfrequentem Wechselstrom durchflossen wird. Das Induktionsheizelement ist vorzugsweise dazu vorgesehen, elektrische Energie in ein magnetisches Wechselfeld umzuwandeln, das dazu vorgesehen ist, in einem metallischen, vorzugsweise zumindest teilweise ferromagnetischen, Heizmittel, insbesondere einem Gargeschirr, Wirbelströme und/oder Ummagnetisierungseffekte hervorzurufen, die in Wärme umgewandelt werden. Unter einer "Heizfrequenzeinheit" soll insbesondere eine elektrische Einheit verstanden werden, die ein oszillierendes elektrisches Signal, vorzugsweise mit einer Frequenz von zumindest 1 kHz, insbesondere von wenigstens 10 kHz, vorteilhaft von mindestens 20 kHz, und insbesondere von maximal 170 kHz für eine Induktionsheizeinheit erzeugt. Insbesondere ist die Heizfrequenzeinheit dazu vorgesehen, eine, von der Induktionsheizeinheit geforderte, maximale elektrische Leistung von zumindest 1000 W, insbesondere zumindest 2000 W, vorteilhaft zumindest 3000 W und vorzugsweise zumindest 3500 W bereitzustellen. Die Heizfrequenzeinheit umfasst insbesondere zumindest einen Wechselrichter, der vorzugsweise zumindest zwei, vorzugsweise in Reihe geschaltete, bidirektionale unipolare Schalter, die insbesondere von einem Transistor und einer parallel geschalteten Diode gebildet sind, und besonders vorteilhaft zumindest jeweils eine parallel zu den bidirektionalen unipolaren Schaltern geschaltete Dämpfungskapazität, die insbesondere von zumindest einem Kondensator gebildet ist, aufweist. Hierdurch kann eine hochfrequente Energieversorgung der Induktionsheizeinheit bereitgestellt werden. Ein Spannungsabgriff der Hochfrequenzeinheit ist insbesondere an einer gemeinsamen Kontaktstelle zweier bidirektionaler unipolarer Schalter angeordnet. Insbesondere kann ein Induktionsheizgerät mit einer hohen Lebensdauer bereitgestellt werden.It is further proposed that at least the first consumer of an induction heating unit and the power converter are formed by a heating frequency unit. An "induction heating unit" is to be understood in particular as a unit having at least one induction heating element. In particular, in an operating state in which the induction heating unit is supplied with high-frequency alternating current, all induction heating elements of the induction heating unit, preferably simultaneously, supplied with high-frequency alternating current. An "induction heating element" is to be understood in particular as a wound electrical conductor, preferably in the form of a circular disk through which high-frequency alternating current flows in at least one operating state. The induction heating element is preferably provided to convert electrical energy into an alternating magnetic field, which is provided in a metallic, preferably at least partially ferromagnetic, heating means, in particular cooking utensils, eddy currents and / or remagnetization effects which are converted into heat. A "heating frequency unit" should in particular be understood to mean an electrical unit which generates an oscillating electrical signal, preferably at a frequency of at least 1 kHz, in particular of at least 10 kHz, advantageously of at least 20 kHz, and in particular of not more than 170 kHz for an induction heating unit , In particular, the heating frequency unit is provided to provide a maximum electrical power of at least 1000 W, in particular at least 2000 W, advantageously at least 3000 W, and preferably at least 3500 W, required by the induction heating unit. The heating frequency unit comprises in particular at least one inverter, which preferably has at least two, preferably series-connected, bidirectional unipolar switches which are formed in particular by a transistor and a diode connected in parallel, and particularly advantageously at least one damping capacitor connected in parallel to the bidirectional unipolar switches, which is in particular formed by at least one capacitor. As a result, a high-frequency power supply of the induction heating unit can be provided. A voltage tap of the radio-frequency unit is arranged in particular at a common contact point of two bidirectional unipolar switches. In particular, an induction heater with a long service life can be provided.
Es wird weiterhin ein Hausgerät mit einer erfindungsgemäßen Hausgerätevorrichtung vorgeschlagen. Insbesondere ist das Hausgerät als ein Kochfeld, vorzugsweise als ein Induktionskochfeld, und/oder insbesondere als ein Backofen, vorzugsweise ein Induktionsbackofen, mit insbesondere einer Kochfeldvorrichtung, vorzugsweise einer Induktionskochfeldvorrichtung, ausgebildet.It is further proposed a domestic appliance with a domestic appliance device according to the invention. In particular, the domestic appliance is designed as a hob, preferably as an induction hob, and / or in particular as an oven, preferably an induction oven, with in particular a hob device, preferably an induction hob device.
Weitere Vorteile ergeben sich aus der folgenden Zeichnungsbeschreibung. In der Zeichnung sind Ausführungsbeispiele 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 drawings, embodiments of the invention are 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 als Induktionskochfeld ausgebildetes Hausgerät mit einer erfindungsgemäßen Hausgerätevorrichtung in einer schematischen Darstellung von oben,
- Fig. 2:
- eine als Induktionsheizvorrichtung ausgebildete erfindungsgemäße Hausgerätevorrichtung des Hausgeräts aus
Figur 1 in einer schematischen Darstellung, - Fig. 3:
- eine schematische Darstellung eines beispielhaften Leistungsverlaufs der erfindungsgemäßen Hausgerätevorrichtung aus
Figur 2 und - Fig. 4:
- eine schematische Darstellung eines Verlaufs einer Leistung eines Leistungswandlers der Hausgerätevorrichtung aus
Figur 2 in Abhängigkeit von einer Frequenz eines hochfrequenten Wechselstroms des Leistungswandlers, dargestellt für mehrere verschiedene Gargeschirre.
- Fig. 1:
- a home appliance designed as an induction hob with a domestic appliance device according to the invention in a schematic representation from above,
- Fig. 2:
- a home appliance device according to the invention designed as an induction heater of the domestic appliance
FIG. 1 in a schematic representation, - 3:
- a schematic representation of an exemplary performance curve of the home appliance device according to the invention
FIG. 2 and - 4:
- a schematic representation of a curve of a power of a power converter of the home appliance device
FIG. 2 as a function of a frequency of a high-frequency alternating current of the power converter, shown for several different cooking utensils.
Zu einem Beginn des Betriebsabschnitts 90 des ersten Verbrauchers 20 wird die Frequenz f des hochfrequenten Wechselstroms durch die Steuereinheit 34 während eines Sicherheitsabschnitts 91 in einem Startabschnitt 92 von einem Startwert fSTART1 von 170 kHz auf einen Sicherheitswert fS1 von 35 kHz angepasst. Der Betriebsabschnitt 90 des ersten Verbrauchers 20 weist eine Dauer von 93 ms, der Sicherheitsabschnitt 91 eine Dauer von 16,5 ms, also 17,7 Prozent der Dauer des Betriebsabschnitts 90, und der Startabschnitt 92 weist eine Dauer von 350 µs auf, also 2,1 Prozent einer Dauer des Sicherheitsabschnitts 91. Zu einem Ende des Sicherheitsabschnitts 91 wird über die Steuereinheit 34 die Frequenz f des hochfrequenten Wechselstroms von dem Sicherheitswert fS1 von 35 kHz auf einen Betriebswert fOp1 von 25 kHz eingestellt. Zu einem Ende des Betriebsabschnitts 90 des ersten Verbrauchers 20 wird durch die Steuereinheit 34 die Frequenz f des hochfrequenten Wechselstroms von dem Betriebswert fOp1 von 25 kHz auf einen Stopwert fSTOP1 von 130 kHz angepasst. In dem folgenden Schaltabschnitt 93, der eine Dauer von 7 ms aufweist, wird durch den Leistungswandler 30 kein hochfrequenter Wechselstrom erzeugt. In diesem Schaltabschnitt 93 erfolgt eine Umschaltung der Schaltanordnung 64 von einer Verbindung des Leistungswandlers 30 mit dem ersten Verbraucher 20 zu einer Verbindung des Leistungswandlers 30 mit dem zweiten Verbraucher 22. Zu Beginn des folgenden Betriebsabschnitts 94 des zweiten Verbrauchers 22 wird von der Steuereinheit 34 ein Sicherheitsabschnitt 95 geschaltet. Der Betriebsabschnitt 94 weist eine Dauer von 1893 ms, der Sicherheitsabschnitt 95 eine Dauer von 16,5 ms auf, also 0,08 Prozent der Dauer des Betriebsabschnitts 94. Zu einem Beginn des Sicherheitsabschnitts 95 wird die Frequenz f des hochfrequenten Wechselstroms, den der zweite Verbraucher 22 von dem Leistungswandler 30 bezieht, in einem Startabschnitt 96 von einem Startwert fSTART2 von 170 kHz auf einen Sicherheitswert fS2 von 35 kHz angepasst. Der Startabschnitt 96 weist eine Dauer von 700 µs auf, also 4,2 Prozent der Dauer des Sicherheitsabschnitts 95. Zu einem Ende des Sicherheitsabschnitts 95 wird die Frequenz f des hochfrequenten Wechselstroms von dem Sicherheitswert fS2 von 35 kHz auf den Betriebswert fOp2 von 29 kHz angepasst. Zu einem Ende des Betriebsabschnitts 94 wird durch die Steuereinheit 34 die Frequenz f des hochfrequenten Wechselstroms von dem Betriebswert fOp2 von 29 kHz auf einen Stopwert fSTOP2 von 120 kHz angepasst. Im Anschluss erfolgt ein nicht in dem Diagramm dargestellter Schaltabschnitt, in welchen wie in dem Schaltabschnitt 93 eine Stromversorgung durch den Leistungswandler 30 unterbrochen ist und in dem eine Umschaltung der Schaltanordnung 64 von der Verbindung des Leistungswandlers 30 mit dem zweiten Verbraucher 22 auf die Verbindung des Leistungswandlers 30 mit dem ersten Verbraucher 20 erfolgt, worauf sich der in dem Diagramm schematisch gezeigte Ablauf wiederholt. Eine solche Wiederholung des schematisch dargestellten Ablaufs erfolgt periodisch mit einer Periodendauer von 2 s. Alternativ sind andere Betriebsmodi, in denen eine andere Anzahl von Verbrauchern, insbesondere einer, drei oder mehr, in zeitlich voneinander beabstandeten Betriebsabschnitten betrieben werden, möglich. Alternativ sind andere Werte der Frequenzen, insbesondere andere Sicherheitswerte, möglich. Insbesondere die Sicherheitswerte hängen ab von Kenngrößen der Verbraucher.At a beginning of the
Es wird von einem Betriebszustand ausgegangen, bei dem in einem vorhergehenden Betriebsabschnitt ein Gargeschirr auf einer dem ersten Verbraucher 20 zugeordneten Heizzone erwärmt wurde, der durch die Kurve 2 beschrieben werden kann. In dem vorhergehenden Betriebszustand wurde der Leistungswandler 30 mit einer Betriebsfrequenz fOp betrieben, bei der eine Leistung des Leistungswandlers niedriger als die maximale Leistung Pmax ist. Wird während eines Betriebszustands, in dem der erste Verbraucher keine Leistung von dem Leistungswandler 30 bezieht, ein Austausch des Gargeschirrs vorgenommen, so könnte bei einem weiteren Betrieb des Leistungswandlers 30 mit der Betriebsfrequenz fOp in dem folgenden Betriebsabschnitt eine Überschreitung der maximalen Leistung Pmax oder eine Unterschreitung der Grenzfrequenz fZVS eintreten, so dass eine Beschädigung des Leistungswandlers 30 auftreten kann. Daher wird zu einem Beginn eines Betriebsabschnitts ein Sicherheitsabschnitt von der Steuereinheit 34 geschaltet, in dem die Frequenz f einen Sicherheitswert fS aufweist. Wie aus der
In dem Fall, dass das Gargeschirr, das durch die Kurve 2 beschrieben wird, gegen ein Gargeschirr ausgetauscht wird, das durch die Kurve 1 beschrieben wird, ist ein sicherer Betrieb des Leistungswandlers 30 auch bei einer Beibehaltung der Betriebsfrequenz fOp gewährleistet, da sowohl die Grenzfrequenz fZVS1 niedriger als die Betriebsfrequenz fOp ist als auch die bei der Betriebsfrequenz fOp auftretende Leistung geringer ist als die maximale Leistung Pmax. Aufgrund des Austauschs des Gargeschirrs wird eine geringere als die von dem Bediener angeforderte Leistung bei der Betriebsfrequenz fOp erreicht. In dem Sicherheitsabschnitt wird nun die Frequenz f von der Steuereinheit 34 auf den Sicherheitswert fS eingestellt. Im Vergleich zu dem Verlauf der Leistung bei der Kurve 2 kommt es nun zu einem Leistungsabfall. Der Sensor 86 nimmt während des Sicherheitsabschnitts eine Messung des Spitzenwerts der über den Spannungsabgriff 60 des Leistungswandlers 30 fließenden Stromstärke vor (
In dem Fall, dass das Gargeschirr, das durch die Kurve 2 beschrieben wird, gegen ein Gargeschirr ausgetauscht wird, das durch die Kurve 3 beschrieben wird, würde bei einer Beibehaltung der Betriebsfrequenz fOp ein sicherer Betrieb des Leistungswandlers 30 nicht gewährleistet werden können, da bei der Betriebsfrequenz fOp in der Kurve 3 sowohl die Grenzfrequenz fZVS3 als auch die maximale Leistung Pmax überschritten wird. Durch die Einstellung der Frequenz f des hochfrequenten Wechselstroms auf den Sicherheitswert fS wird ein sicherer Betrieb des Leistungswandlers 30 gewährleistet, da der Sicherheitswert fS der Frequenz f höher liegt als die Grenzfrequenz fZVS3. Eine Überschreitung der maximalen Leistung Pmax tritt auf, welche jedoch in einem kurzen Zeitraum, wie dem Sicherheitsabschnitt, toleriert werden kann. Weiterhin wird durch die Messung des Spitzenwerts der über den Spannungsabgriff 60 des Leistungswandlers 30 fließenden Stromstärke von der Steuereinheit 34 eine neue Betriebsfrequenz bestimmt, mit der die von dem Bediener über die Bedieneinheit 28 angeforderte Heizleistung während des Betriebsabschnitts und ein sicherer Betrieb des Leistungswandlers 30 erreicht werden können. Alternativ sind auch Sicherheitswerte möglich, bei denen bei einem Austausch des Gargeschirrs die in dem Sicherheitsabschnitt auftretende Leistung höher ist als ohne einen Austausch des Gargeschirrs, die Grenzfrequenz fZVS jedoch nicht überschritten wird. Alternativ ist es möglich, auf eine Schaltung des Sicherheitsabschnitts zu verzichten, wenn ein Betriebswert für mögliche Gargeschirre als Sicherheitswert genutzt werden kann.In the event that the cooking utensil described by the curve 2 is exchanged for a cooking utensil, which is described by the curve 3, with a maintenance of the operating frequency f Op safe operation of the
Grundsätzlich ist es möglich, einen Startabschnitt vorzusehen, in dem ein Wert der Frequenz f von einem Startwert auf den Betriebswert angepasst wird, wenn auf einen Sicherheitsabschnitt verzichtet wird.
Claims (8)
- Induction cooktop with at least one first consumer (20, 24) which is provided to be operated in sections in at least one operating mode, and which in one operating section (90, 94) draws an electrical power dependent on at least one internal and at least one external operating parameter from a power inverter (30, 32), wherein the internal operating parameter is formed by an operating parameter of the power transformer (30, 32) and the external operating parameter is dependent on a position of a cooked item container and/or a material of the cooked item container placed on a cooking surface, characterised by a control unit (34) which is provided to set the internal operating parameter to at least one safety value at the start of the operating section (90) in at least one safety section (91), in which an operation of the power transformer (30, 32) can take place irrespective of a value of the external operating parameter within loading limits of the power transformer (30, 32).
- Induction cooktop according to claim 1, characterised in that the safety section (91) has a duration which corresponds to a maximum of 50 percent of a duration of the operating section.
- Induction cooktop according to one of the preceding claims, characterised by a sensor (86, 88) which is provided to measure a power parameter during the safety section (90).
- Induction cooktop according to one of the preceding claims, characterised in that the control unit (34) is provided to adapt the internal operating parameter from a start value to the safety value in a start section (92, 96).
- Induction cooktop according to claim 4, characterised in that the start section (92, 96) has a duration which corresponds to a maximum of 60 percent of a duration of the safety section.
- Induction cooktop according to one of the preceding claims, characterised by at least one second consumer (22, 26) which is provided to draw electrical power from the power transformer (30, 32) in at least one operating mode in at least one operating section (94) which differs in time from operating sections (90) of the first consumer (20, 24).
- Induction cooktop according to one of the preceding claims, characterised in that at least the first consumer (20, 24) is embodied as an induction heating unit and at least the power transformer (30, 32) is embodied as a heating frequency unit.
- Method for the operation of an induction cooktop according to one of the preceding claims, wherein at the start of the operating section (90) the internal operating parameter is set to the at least one safety value in the at least one safety section (91), in which an operation of the power transformer (30, 32) can take place irrespective of a value of the external operating parameter within loading limits of the power transformer (30, 32).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES201130504 | 2011-03-31 |
Publications (3)
Publication Number | Publication Date |
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EP2506673A2 EP2506673A2 (en) | 2012-10-03 |
EP2506673A3 EP2506673A3 (en) | 2012-11-07 |
EP2506673B1 true EP2506673B1 (en) | 2016-02-03 |
Family
ID=45954379
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12161380.6A Not-in-force EP2506673B1 (en) | 2011-03-31 | 2012-03-27 | Induction cooktop |
Country Status (2)
Country | Link |
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EP (1) | EP2506673B1 (en) |
ES (1) | ES2562616T3 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3000361B1 (en) * | 2012-12-20 | 2014-12-26 | Fagorbrandt Sas | METHOD AND DEVICE FOR POWER SUPPLYING INDUCTION MEANS |
EP2876974B1 (en) * | 2013-11-21 | 2018-01-31 | BSH Hausgeräte GmbH | Cooking device |
EP3169138A1 (en) * | 2015-11-16 | 2017-05-17 | IFF GmbH | Inductive heating device with adaptive multi-point temperature control |
KR20220118221A (en) * | 2021-02-18 | 2022-08-25 | 엘지전자 주식회사 | Induction heating apparatus and method for controlling induction heating apparatus |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2008120448A1 (en) * | 2007-03-12 | 2008-10-09 | Panasonic Corporation | Induction cooking device |
WO2008155923A1 (en) * | 2007-06-21 | 2008-12-24 | Panasonic Corporation | Induction heating cooker |
CA2678840C (en) * | 2007-08-13 | 2013-10-01 | Panasonic Corporation | Induction heating cooker |
ES2368643B1 (en) * | 2009-06-01 | 2012-10-10 | Bsh Electrodomésticos España, S.A. | COOKING FIELD WITH A TEMPERATURE SENSOR. |
-
2012
- 2012-03-27 EP EP12161380.6A patent/EP2506673B1/en not_active Not-in-force
- 2012-03-27 ES ES12161380.6T patent/ES2562616T3/en active Active
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Publication number | Publication date |
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EP2506673A3 (en) | 2012-11-07 |
ES2562616T3 (en) | 2016-03-07 |
EP2506673A2 (en) | 2012-10-03 |
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