EP2648476B1 - Induction heating device - Google Patents

Induction heating device Download PDF

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Publication number
EP2648476B1
EP2648476B1 EP13160666.7A EP13160666A EP2648476B1 EP 2648476 B1 EP2648476 B1 EP 2648476B1 EP 13160666 A EP13160666 A EP 13160666A EP 2648476 B1 EP2648476 B1 EP 2648476B1
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EP
European Patent Office
Prior art keywords
unit
induction heating
rectifier
frequency
heating device
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EP13160666.7A
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German (de)
French (fr)
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EP2648476A1 (en
Inventor
Pablo Jesus Hernandez Blasco
Sergio Llorente Gil
Oscar Lucia Gil
Arturo Mediano Heredia
Daniel Palacios Tomas
Hector Sarnago Andia
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BSH Hausgeraete GmbH
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BSH Hausgeraete GmbH
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Publication of EP2648476A1 publication Critical patent/EP2648476A1/en
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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 is based on an induction heating device according to the preamble of claim 1.
  • Such a device is made US Pat. No. 3,898,410 known.
  • Induction hobs are known whose inductors are operated via a rectifier unit formed by slow-recovery diodes.
  • the object of the invention is in particular to provide a generic device with improved high frequency capability and / or improved efficiency.
  • the object is achieved by the features of claim 1, while advantageous embodiments and modifications of the invention can be taken from the dependent claims.
  • the invention is based on an induction heating device, in particular a cooking appliance induction heating device, advantageously induction hob device, with at least one rectifier unit which is intended to rectify the current of an electric energy source.
  • the object is achieved by an induction heating device according to claim 1.
  • claim 11 defines the operating method of the induction device.
  • the rectifier unit has at least one faster-recovering rectifier element, in particular at least two, advantageously at least three, preferably at least four, faster-recovery rectifier elements.
  • the at least one faster-recovering rectifier element differs from a freewheeling diode, in particular a rectifier element, which is connected in parallel with a switching element.
  • An "electric energy source” is to be understood in particular as meaning an energy source which has an electrical voltage of at least 50 V, in particular at least 100 V, advantageously at least 200 V, in particular an electrical AC voltage with a maximum frequency of 200 Hz, advantageously at most 60 Hz at most 50 Hz, and / or an electric current of in particular up to at least 5 A, advantageously at least 10 A, advantageously at least 15 A, in particular an alternating electrical current with a frequency of at most 200 Hz, advantageously at most 60 Hz, preferably at most 50 Hz, provides.
  • the electric energy source is at least one phase of a domestic power connection.
  • the rectifier unit is designed as a bridge rectifier.
  • the rectifier unit is provided to output a voltage applied to input contacts and / or a voltage supplied to the input contacts to output contacts.
  • a "rectifier element" is to be understood in particular as a single-pole electrical element which is provided with current flowing through at least up to a voltage of at least 300 V, advantageously at least 450 V, preferably at least 600 V, in only one direction.
  • the rectifier element is a diode. Two rectifier elements connected in the same direction in series or in parallel, between which a current path branches off, in particular in no operating state, should in particular be understood as a single rectifier element.
  • a “faster-recovering” rectifier element is understood to mean a rectifier element which has a reverse recovery time of a maximum of 100 ns, in particular a maximum of 50 ns, advantageously a maximum of 30 ns.
  • “provided” is meant in particular specially programmed, switched, designed and / or equipped understood.
  • a high-frequency capability of the rectifier unit can be achieved.
  • a high-frequency electric power source can be effectively used.
  • the induction heating device has at least one heating frequency unit which is provided to receive energy in at least one operating state via the rectifier unit and to supply at least one induction heating unit with a high-frequency alternating current.
  • the induction heating device has at least one induction heating 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 heater” should in particular be understood to mean a heating element with at least one induction heating line, which is intended to pass through Induction effects, in particular induction of electric current and / or Ummagnetleitersemble, in one, preferably ferromagnetic, in particular metallic, heating means, in particular in a cooking utensil, in an oven wall and / or in a radiator, which is arranged in an oven to cause heating of the heating means.
  • the induction heating element is provided to transmit in at least one operating mode in which the induction heating is connected to a supply electronics, a power of at least 100 W, in particular at least 500 W, advantageously at least 1000 W, preferably at least 2000 W, in particular electrical energy into electromagnetic field energy, which is finally converted into heat in a suitable heating medium.
  • An "induction heating line” is to be understood as meaning, in particular, an electrical line which is intended to carry an electric current which is intended to induce induction effects in a suitable heating means.
  • the induction heating is as inductance, in particular as a coil, advantageously as a flat coil, preferably at least substantially in the form of a circular disc, alternatively in the form of an oval or a rectangle formed.
  • the induction heating line in particular with a coupled heating means, has an inductance of at least 1 nH, in particular at least 10 nH, advantageously at least 20 nH.
  • the induction heating line in particular without a coupled heating means, has an inductance of not more than 1000 nH, in particular not more than 100 nH, advantageously not more than 50 nH.
  • the induction heating is intended, at least in an operating state of high-frequency alternating current, in particular an alternating current having a frequency of at least 20 kHz, in particular at least 30 kHz, advantageously at least 50 kHz, preferably at least 60 kHz, in particular at most 500 kHz, in particular with a current strength of at least 0.5 A, in particular at least 1 A, advantageously at least 3 A, preferably at least 10 A, to be flowed through.
  • high-frequency alternating current in particular an alternating current having a frequency of at least 20 kHz, in particular at least 30 kHz, advantageously at least 50 kHz, preferably at least 60 kHz, in particular at most 500 kHz, in particular with a current strength of at least 0.5 A, in particular at least 1 A, advantageously at least 3 A, preferably at least 10 A, to be flowed through.
  • a “heating frequency unit” should in particular be understood to mean an electrical unit which has an oscillating electrical signal, preferably with a frequency of at least 20 kHz, in particular of at least 30 kHz, advantageously of at least 50 kHz, and in particular of not more than 500 kHz, for at least one Induced heating unit generates.
  • the Schufrequenzü is provided to at least one operating state, a DC voltage, a pulsating DC voltage and / or an AC voltage, in particular an AC voltage having a frequency of less than 200 Hz, in particular less than 60 Hz, advantageously less than 50 Hz, in a high-frequency To convert AC voltage.
  • the heating frequency unit is designed as an inverter.
  • the heating frequency unit has at least one, preferably at least two, switching elements.
  • the switching elements of switching elements with parallel rectifier element differ.
  • a “switching element” is to be understood in particular to mean an electronic element which is intended to produce and / or to separate an electrically conductive connection between two points, in particular contacts of the switching element
  • the switching element is designed as a semiconductor switching element, in particular as a transistor, advantageously as a bipolar transistor with preferably insulated gate electrode (IGBT)
  • the switching element is designed as a mechanical and / or electromechanical switching element, in particular as a relay
  • an efficient supply of the induction heating unit can be achieved.
  • the induction heating device has at least one resonance unit, which is provided to form at least one resonant subcircuit with an induction heating unit, and which is connected directly to the electric energy source in at least one operating state.
  • a "resonance unit” is to be understood in particular as a unit which comprises at least one resonance capacitance, which is preferably formed by at least one capacitor, which is preferably different from a damping capacity and / or a capacitance connected in parallel with a switching element.
  • a resonant capacitance is formed by a combination of series and parallel circuits of a plurality of capacitors.
  • a “resonant subcircuit” is to be understood, in particular, as part of a circuit in which at least one resonant capacitance of the resonant unit is connected in series and / or parallel to the induction heating unit.
  • a resonant frequency of the resonant subcircuit is at least 30 kHz, in particular at least 50 kHz, advantageously at least 70 kHz, preferably at least 100 kHz.
  • the resonance capacity is directly connected to the induction heating unit.
  • the at least one resonance subcircuit has at least one contact, which is directly connected to a common power contact of two switching elements of the heating frequency unit.
  • the at least one resonance capacitor is provided to be charged and / or discharged in at least one operating state, via at least one of the switching elements and the induction heating unit.
  • 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 500 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 in particular over a frequency range from 1 kHz to 500 kHz by a maximum of 100%, in particular a maximum of 40%, advantageously a maximum 10%, and preferably at most 3%, varies.
  • An “impedance” should be understood in particular to mean a division of an effective voltage by an effective current of the electrical connection.
  • external contacts of the resonance unit are connected directly to contacts of the electric power source.
  • An “external contact” of the resonance unit should in particular be understood as a contact which is directly connected to exactly one resonance capacity of the resonance unit. In particular, an effective operation can be achieved.
  • the induction heating device has at least one induction heating unit which is connected at least in the manner of a half bridge.
  • half-bridge type should in particular be understood to mean that at least the induction heating unit is connected in a bridge branch between a common contact of two switching elements of the heating frequency unit and a common contact of two resonance capacitances of the resonance unit.
  • a common contact of two electrical elements is to be understood in particular as a contact which is directly connected to both electrical elements. In particular, an effective operation can be achieved.
  • the induction heating device has at least one resonance unit which has at least one external contact which is electrically conductively connected in at least one direction to at least one switching element of the heating frequency unit via at least one rectifier element, the connection being different from a connection having an electrical connection Component of the resonance unit has.
  • the external contact is over at least one another rectifier element electrically conductively connected in at least one direction with another switching element of the heating frequency unit.
  • the resonance unit has at least one further external contact, which is electrically conductively connected to at least one switching element of the heating frequency unit via at least one further rectifier element in at least one direction.
  • each resonant circuit has at least one, in particular exactly one rectifier element.
  • a "resonant circuit” is to be understood, in particular, as a closed electrical subcircuit, which in at least one operating state can be traversed by current in at least one direction and which has at least the induction heating unit and at least one resonant capacitance.
  • a subcircuit is to be understood, in particular, as an unbranched path along elements of an electrical circuit.
  • the rectifier element is a rectifier element of the rectifier unit, whereby a part savings can be achieved. It can, in particular by reducing and / or avoiding return currents, in particular resonant reverse currents, switching losses are minimized, whereby an efficiency of the induction heater can be increased.
  • the choice of rectifier elements according to the invention as an advantage faster recovering rectifier elements advantageous.
  • At most one rectifier element of the rectifier unit in particular at most one rectifier element of the induction heater, is simultaneously conducting.
  • a rectifier element is "conductive" should be understood in particular that it is from a current, in particular a current of at least 0.01 A, in particular at least 0.1 A, preferably at least 1 A, flows through.
  • a higher efficiency can be achieved because power losses can be avoided by additional components.
  • the induction heating device has at least one buffer capacity, which is connected directly to the electric power source, in particular this is connected in parallel.
  • an improved power factor can be achieved.
  • current peaks can be intercepted.
  • the induction heating device has at least one control unit which is provided to operate the heating frequency unit in at least one operating mode with a frequency that is smaller than a resonance frequency, which is given by an induction heating unit and a resonance unit.
  • the control unit is provided to generate high-frequency switching signals and thus to control the at least one switching contact of the at least one switching element of the heating frequency unit.
  • the control unit is provided to set a heating power of the induction heating unit as a function of an operator input.
  • the control unit has at least one arithmetic unit and preferably at least one memory unit in which, in particular, an operating program is stored which is executed by the arithmetic unit at least in an operating state. In particular, a simpler control can be achieved. In particular, an at least substantially linear frequency power dependency can be achieved.
  • a domestic appliance in particular cooking appliance, advantageously oven and / or hob, proposed with an induction heating according to the invention.
  • FIG. 1 shows a cooking appliance designed as a domestic appliance 10.
  • the domestic appliance 10 has four induction heating units 20, 22, 24, 26.
  • the induction heating units 20, 22, 24, 26 are designed as cooktop inductors, which are arranged under a cooktop panel.
  • the domestic appliance 10 has a power electronics unit 14, which is provided to supply the induction heating units 20, 22, 24, 26 with energy.
  • the power electronics unit 14 and the induction heating units 20, 22, 24, 26 are part of induction heaters 12.
  • FIG. 2 shows an induction heating device 12 with the induction heating unit 20.
  • the induction heating device 12 comprises a rectifier unit 30.
  • the induction heating unit 20 is hereby represented by a series connection of a coil and a resistor, which stands for an electric power decrease by a cooking utensil.
  • the induction heating device 12 has a heating frequency unit 50, which is provided to supply the induction heating unit 20 with high-frequency alternating current in various operating modes.
  • the rectifier unit 30 has four faster-recovery rectifier elements 32, 34, 36, 38.
  • the rectifier unit 30 is provided to rectify voltage and current of an electric power source 18, which are applied to input contacts 42 and 44 of the rectifier unit 30, and to supply a heating frequency unit 50.
  • the heating frequency unit 50 is provided to receive energy in the one operating state via the rectifier unit 30.
  • the rectifier elements 32, 34, 36, 38 are formed as diodes.
  • the induction heating device 12 has a buffer capacity 40 which is connected between the input contacts 42, 44 of the rectifier unit 30 and is thus connected directly to the electric power source 18. Furthermore, the rectifier unit 30 has two output contacts 56, 57, to which the heating frequency unit 50 is directly connected.
  • a first rectifier element 32 connects a first input contact 42 of the rectifier unit 30 to a first output contact 56 of the rectifier unit 30, so that a current flow to the first output contact 56 is possible.
  • a second rectifier element 34 connects a second output contact 57 of the rectifier unit 30 to a second input contact 44 of the rectifier unit 30, so that a current flow to the second input contact 44 is possible.
  • a third rectifier element 36 connects the second input contact 44 to the first output contact 56, so that a current flow to the first output contact 56 is possible.
  • a fourth rectifier element 38 connects the second output contact 57 to the first input contact 42, so that a current flow to the first input contact 42 is possible.
  • the heating frequency unit 50 is formed by two switching elements 52, 53.
  • the switching elements 52, 53 are designed as IGBTs.
  • a first switching element 52 of the heating frequency unit 50 has an input contact, which is connected directly to the first output contact 56 of the rectifier unit 30.
  • a second switching element 53 of the heating frequency unit 50 has an output contact which is directly connected to the second output contact 57 of the rectifier unit 30.
  • the first switching element 52 has an output contact which is directly connected to an input contact of the second switching element 53 via a common contact 51.
  • the induction heating device 12 has a resonance unit 60, which is provided to form two resonance subcircuits with the induction heating unit 20.
  • the resonance unit 60 has two resonance capacitances 62, 64.
  • a first resonance capacitance 62 and a second resonance capacitance 64 each form, with the induction heating unit 20, a resonant pitch circuit having a same resonance frequency.
  • the resonant frequency takes on a value between 20 kHz and 100 kHz depending on a used cooking utensil which influences an inductance of the induction heating unit 20.
  • the two resonance capacitances 62, 64 are connected directly to one another via a common contact 61.
  • the first resonant capacitance 62 has a further contact, which forms a first external contact 63 of the resonance unit 60.
  • the second resonant capacitance 64 has a further contact, which forms a second external contact 65 of the resonance unit 60.
  • the first external contact 63 is connected directly to the second input contact 44 of the rectifier unit 30 and thus to the electric power source 18.
  • the second external contact 65 is connected directly to the first input contact 42 of the rectifier unit 30 and thus to the electric power source 18.
  • the resonance unit 60 is directly connected to the electric power source 18 in an operating state.
  • the induction heating unit 20 is connected in a half-bridge manner.
  • the induction heating unit 20 is disposed in a bridge branch between the common contacts 51, 61 of the heating frequency unit 50 and the resonance unit 60.
  • the first external contact 63 is electrically conductively connected via the rectifier element 36 to the first output contact 56 and thus to the first switching element 52. Furthermore, the first external contact 63 is electrically conductively connected via the rectifier element 34 to the second output contact 57 and thus to the second switching element 53.
  • the second external contact 65 is electrically conductively connected via the rectifier element 32 to the first output contact 56 and thus to the first switching element 52. Furthermore, the second external contact 65 is electrically conductively connected via the rectifier element 38 to the second output contact 57 and thus to the second switching element 53. In each resonant circuit exactly one rectifier element 32, 34, 36, 38 of the rectifier unit 30 is arranged.
  • the induction heating device 12 has a control unit 16 which is provided to operate the heating frequency unit 50 in different operating modes, for example at different requested heating powers, at a frequency which is lower than the resonance frequency given by the induction heating unit 20 and the resonance unit 60 is.
  • the switching elements 52, 53 each have a control contact 54, 55.
  • the control unit 16 is provided to control the control contacts 54, 55 of the switching elements 52, 53 separately with a respective Anberichtcher S 1 , S 2 , for example, a switching current or a switching voltage to change switching states of the switching elements 52, 53, ie between a Change line state and a disconnected state.
  • the control unit 16 is provided to operate the heating frequency unit 50 and the switching elements 52, 53 in each operation mode at a frequency smaller than the resonance frequency given by the induction heating unit 20 and the resonance unit 60.
  • each regular operating mode in which at most one of the switching elements 52, 53 is opened at the same time, at most one of the rectifier elements 32, 34, 36, 38 of the rectifier unit 30 conducts simultaneously.
  • a first operating state in which a positive voltage is applied to the first input contact 42 of the rectifier unit 30 and the first switching element 52 is in a conduction state, the first rectifier element 32 conducts at most.
  • a second operating state in which at the first input contact 42 of the rectifier unit 30 is a positive voltage and the second switching element 53 is in a conduction state, the maximum directs the second rectifier element 34.
  • FIG. 3 shows the course of various characteristics S 1 , S 2 , U 1 , U 2 , I 1 , I 2 , I L of the induction heater 12 in a plurality of superimposed diagrams in response to a time t for a single control cycle in the case of a positive voltage at the first input contact 42.
  • the control cycles are repeated periodically.
  • a first control characteristic S 1 of the first switching element 52 is shown, in dependence of which the switching state of the first switching element 52 changes.
  • a first voltage U 1 is shown, which drops above the first switching element 52, measured from the first output contact 56 to the common contact 51.
  • a first current I 1 is shown flowing through the first switching element 52 from the output contact 56 to the common contact 51.
  • a second control characteristic S 2 of the second switching element 53 is shown, in dependence of which the switching state of the second switching element 53 changes.
  • a second voltage U 2 is shown, which drops across the second switching element 53, measured from the common contact 51 to the second output contact 57.
  • a second current I 2 is shown, which flows through the second switching element 53 from the common contact 51 to the second output contact 57.
  • a power current I L is shown, which flows from the common contact 51 of the switching elements 52, 53 to the common contact 61 of the resonance capacitances 62, 64.
  • the first switching element 52 is placed in the line state after the second switching element 53 has been set to the disconnected state by resetting the second control characteristic S 2 to zero.
  • the second resonant capacitance 64 then discharges via the first rectifier element 32, the first switching element 52 and the induction heating unit 20. Further, rectified current from the first output contact 56 via the first switching element 52 and the induction heating unit 20 charges the first resonant capacitance 62.
  • the induction heating unit 20 initially delays one Increase of the first current I 1 . Above the first switching element 52 is a voltage of almost 0V. Accordingly, a voltage supplied from the rectifier unit 30 drops across the second switching element 53, which is in the disconnected state.
  • the power current I L corresponds to the first current I 1 .
  • the power current I L comes to a stop by the induction heating unit 20.
  • a reciprocal of twice the time difference t 1 -t 0 corresponds to the natural frequency of the resonant subcircuits.
  • the second resonance capacitance 64 was partially charged with a back voltage, and the first resonance capacitance 62 was charged beyond the voltage supplied by the rectifier unit 30 with an overvoltage.
  • the counter voltage is applied to the first rectifier element 32 from the time t 1 backwards.
  • the overvoltage starts at time t 1 as the second voltage U 2 at the second switching element 53.
  • a second time t 2 analogously to the starting time t 0 , by setting the second control characteristic S 2 to the switching value, the second switching element 53 is placed in the line state, after resetting the first control characteristic S 1 to zero, the first switching element 52 in the disconnected state was shifted.
  • a reciprocal of twice the time difference t 2 -t 0 corresponds to the frequency with which the heating frequency unit 50 is operated.
  • the first resonance capacitance 62 then discharges via the second switching element 53, the induction heating unit 20 and the second rectifier element 34.
  • Above the second switching element 53 is a voltage of almost 0V.
  • the power current I L corresponds to a negative of the second current I 2 .
  • the power current I L comes to a stop by the induction heating unit 20.
  • the first resonance capacitance 62 was partially charged with a reverse voltage and the second resonance capacitance 64 was charged across the voltage also supplied from the rectifier unit 30 is charged with an overvoltage.
  • the counter voltage is applied to the second rectifier element 34 from time t 3 onwards.
  • the overvoltage starts at time t 3 as the first voltage U 1 at the first switching element 52.
  • a new cycle begins as from the start time t 0 .
  • a reciprocal of the difference t 4 - t 0 corresponds to the frequency with which the heating frequency unit 50 is driven.
  • a distance t 2 - t 1 or t 4 - t 3 in which no power is converted, changed.
  • the power of the induction heating unit 20 can be changed in linear dependence on the frequency as long as the frequency is smaller than the resonance frequency, with a reduction in the frequency corresponding to a reduction in power. This is ensured by the control unit 16 and current sensors (not shown in detail). Since the currents I 1 , I 2 , I L are zero at the times t 0 , t 2 , t 4 , switching losses in the switching elements 52, 53 are avoided.

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  • General Induction Heating (AREA)

Description

Die Erfindung geht aus von einer Induktionsheizvorrichtung nach dem Oberbegriff des Anspruchs 1. So eine Vorrichtung ist aus US 3 898 410 A bekannt.The invention is based on an induction heating device according to the preamble of claim 1. Such a device is made US Pat. No. 3,898,410 known.

Es sind Induktionskochfelder bekannt, deren Induktoren über eine Gleichrichtereinheit betrieben werden, die von langsamerholenden Dioden gebildet ist.Induction hobs are known whose inductors are operated via a rectifier unit formed by slow-recovery diodes.

Die Aufgabe der Erfindung besteht insbesondere darin, eine gattungsgemäße Vorrichtung mit verbesserter Hochfrequenztauglichkeit und/oder verbesserter Effizienz 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 generic device with improved high frequency capability and / or improved efficiency. 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.

Die Erfindung geht aus von einer Induktionsheizvorrichtung, insbesondere einer Gargeräteinduktionsheizvorrichtung, vorteilhaft Induktionskochfeldvorrichtung, mit zumindest einer Gleichrichtereinheit, die dazu vorgesehen ist, Strom einer Elektroenergiequelle gleichzurichten. Die Aufgabe wird durch ein Induktionsheizvorrichtung nach Anspruch 1 gelöst. Ferner, wird durch Anspruch 11 das Betreibsverfahren der Induktionseinrichtung definiert.The invention is based on an induction heating device, in particular a cooking appliance induction heating device, advantageously induction hob device, with at least one rectifier unit which is intended to rectify the current of an electric energy source. The object is achieved by an induction heating device according to claim 1. Furthermore, claim 11 defines the operating method of the induction device.

Es wird vorgeschlagen, dass die Gleichrichtereinheit zumindest ein schnellerholendes Gleichrichterelement, insbesondere zumindest zwei, vorteilhaft zumindest drei, vorzugsweise zumindest vier, schnellerholende Gleichrichterelemente, aufweist.It is proposed that the rectifier unit has at least one faster-recovering rectifier element, in particular at least two, advantageously at least three, preferably at least four, faster-recovery rectifier elements.

Insbesondere unterscheidet sich das zumindest eine schnellerholende Gleichrichterelement von einer Freilaufdiode, insbesondere einem Gleichrichterelement, das einem Schaltelement parallel geschaltet ist. Unter einer "Elektroenergiequelle" soll insbesondere eine Energiequelle verstanden werden, die eine elektrische Spannung von zumindest 50 V, von insbesondere zumindest 100 V, vorteilhaft zumindest 200 V, insbesondere eine elektrische Wechselspannung mit einer Frequenz von maximal 200 Hz, vorteilhaft maximal 60 Hz, vorzugsweise maximal 50 Hz, und/oder einen elektrischen Strom von insbesondere bis zumindest 5 A, vorteilhaft zumindest 10 A, vorteilhaft zumindest 15 A, insbesondere einen elektrischen Wechselstrom mit einer Frequenz von maximal 200 Hz, vorteilhaft maximal 60 Hz, vorzugsweise maximal 50 Hz, bereitstellt. Insbesondere handelt es sich bei der Elektroenergiequelle um zumindest eine Phase eines Hausstromanschlusses. Vorteilhaft ist die Gleichrichtereinheit als Brückengleichrichter ausgebildet. Insbesondere ist die Gleichrichtereinheit dazu vorgesehen, eine an Eingangskontakten anliegende Spannung und/oder einen den Eingangskontakten zugeführten Strom an Ausgangskontakten auszugeben. Unter einem "Gleichrichterelement" soll insbesondere ein einpoliges elektrisches Element verstanden werden, das dazu vorgesehen ist, zumindest bis zu einer Spannung von betragsmäßig zumindest 300 V, vorteilhaft zumindest 450 V, vorzugsweise zumindest 600 V, in nur einer Richtung von Strom durchflossen zu werden. Bei dem Gleichrichterelement handelt es sich um eine Diode. Zwei richtungsgleich in Reihe oder parallel geschaltete Gleichrichterelemente, zwischen denen insbesondere in keinem Betriebszustand ein Strompfad abzweigt, sollen insbesondere als ein einzelnes Gleichrichterelement verstanden werden. Unter einem "schnellerholenden" Gleichrichterelement soll ein Gleichrichterelement verstanden werden, das eine Sperrverzögerungszeit von maximal 100 ns, insbesondere maximal 50 ns, vorteilhaft maximal 30 ns, aufweist. Unter "vorgesehen" soll insbesondere speziell programmiert, geschaltet, ausgelegt und/oder ausgestattet verstanden werden. Es kann insbesondere eine Hochfrequenztauglichkeit der Gleichrichtereinheit erreicht werden. Insbesondere kann eine hochfrequente Elektroenergiequelle effektiv genutzt werden.In particular, the at least one faster-recovering rectifier element differs from a freewheeling diode, in particular a rectifier element, which is connected in parallel with a switching element. An "electric energy source" is to be understood in particular as meaning an energy source which has an electrical voltage of at least 50 V, in particular at least 100 V, advantageously at least 200 V, in particular an electrical AC voltage with a maximum frequency of 200 Hz, advantageously at most 60 Hz at most 50 Hz, and / or an electric current of in particular up to at least 5 A, advantageously at least 10 A, advantageously at least 15 A, in particular an alternating electrical current with a frequency of at most 200 Hz, advantageously at most 60 Hz, preferably at most 50 Hz, provides. In particular, the electric energy source is at least one phase of a domestic power connection. Advantageously, the rectifier unit is designed as a bridge rectifier. In particular, the rectifier unit is provided to output a voltage applied to input contacts and / or a voltage supplied to the input contacts to output contacts. A "rectifier element" is to be understood in particular as a single-pole electrical element which is provided with current flowing through at least up to a voltage of at least 300 V, advantageously at least 450 V, preferably at least 600 V, in only one direction. The rectifier element is a diode. Two rectifier elements connected in the same direction in series or in parallel, between which a current path branches off, in particular in no operating state, should in particular be understood as a single rectifier element. A "faster-recovering" rectifier element is understood to mean a rectifier element which has a reverse recovery time of a maximum of 100 ns, in particular a maximum of 50 ns, advantageously a maximum of 30 ns. By "provided" is meant in particular specially programmed, switched, designed and / or equipped understood. In particular, a high-frequency capability of the rectifier unit can be achieved. In particular, a high-frequency electric power source can be effectively used.

Weiterhin wird vorgeschlagen, dass die Induktionsheizvorrichtung zumindest eine Heizfrequenzeinheit aufweist, die dazu vorgesehen ist, in zumindest einem Betriebszustand Energie über die Gleichrichtereinheit zu beziehen und zumindest eine Induktionsheizeinheit mit einem hochfrequenten Wechselstrom zu versorgen. Insbesondere weist die Induktionsheizvorrichtung zumindest eine Induktionsheizeinheit auf. 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 "induktionsheizeiement" soll insbesondere ein Heizelement mit zumindest einer Induktionsheizleitung verstanden werden, das dazu vorgesehen ist, durch Induktionseffekte, insbesondere Induzierung von elektrischem Strom und/oder Ummagnetisierungseffekte, in einem, vorzugsweise ferromagnetischen, insbesondere metallischen, Heizmittel, insbesondere in einem Gargeschirr, in einer Backofenwand und/oder in einem Heizkörper, der in einem Backofen angeordnet ist, eine Erwärmung des Heizmittels zu verursachen. Insbesondere ist das Induktionsheizelement dazu vorgesehen, in zumindest einem Betriebsmodus, in dem das Induktionsheizelement an eine Versorgungselektronik angeschlossen ist, eine Leistung von zumindest 100 W, insbesondere zumindest 500 W, vorteilhaft zumindest 1000 W, vorzugsweise zumindest 2000 W, zu übertragen, insbesondere elektrische Energie in elektromagnetische Feldenergie zu wandeln, die in einem geeigneten Heizmittel letztendlich in Wärme gewandelt wird. Unter einer "Induktionsheizleitung" soll insbesondere eine elektrische Leitung verstanden werden, die dazu vorgesehen ist, einen elektrischen Strom zu führen, der dazu vorgesehen ist, in einem geeigneten Heizmittel Induktionseffekte hervorzurufen. Vorzugsweise ist die Induktionsheizleitung als Induktivität, insbesondere als Spule, vorteilhaft als Flachspule, vorzugsweise zumindest im Wesentlichen in Form einer Kreisscheibe, alternativ in Form eines Ovals oder eines Rechtecks, ausgebildet. Insbesondere weist die Induktionsheizleitung, insbesondere mit einem gekoppelten Heizmittel, eine Induktivität von zumindest 1 nH, insbesondere zumindest 10 nH, vorteilhaft zumindest 20 nH, auf. Insbesondere weist die Induktionsheizleitung, insbesondere ohne ein gekoppeltes Heizmittel, eine Induktivität von maximal 1000 nH, insbesondere maximal 100 nH, vorteilhaft maximal 50 nH, auf. Vorzugsweise ist die Induktionsheizleitung dazu vorgesehen, zumindest in einem Betriebszustand von hochfrequentem Wechselstrom, insbesondere einem Wechselstrom mit einer Frequenz von zumindest 20 kHz, insbesondere zumindest 30 kHz, vorteilhaft zumindest 50 kHz, vorzugsweise zumindest 60 kHz, insbesondere maximal 500 kHz, insbesondere mit einer Stromstärke von zumindest 0,5 A, insbesondere zumindest 1 A, vorteilhaft zumindest 3 A, vorzugsweise zumindest 10 A, durchflossen zu werden. Unter einer "Heizfrequenzeinheit" soll insbesondere eine elektrische Einheit verstanden werden, die ein oszillierendes elektrisches Signal, vorzugsweise mit einer Frequenz von zumindest 20 kHz, insbesondere von wenigstens 30 kHz, vorteilhaft von mindestens 50 kHz, und insbesondere von maximal 500 kHz, für zumindest eine Induktionsheizeinheit erzeugt. Insbesondere ist die Heizfrequenzeinheit dazu vorgesehen, in zumindest einem Betriebszustand eine Gleichspannung, eine pulsierende Gleichspannung und/oder eine Wechselspannung, insbesondere eine Wechselspannung mit einer Frequenz von weniger als 200 Hz, insbesondere weniger als 60 Hz, vorteilhaft weniger als 50 Hz, in eine hochfrequente Wechselspannung zu wandeln. Insbesondere ist zumindest 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 3700 W, bereitzustellen. Insbesondere ist die Heizfrequenzeinheit als Wechselrichter ausgebildet. Insbesondere weist die Heizfrequenzeinheit zumindest ein, vorzugsweise zumindest zwei, Schaltelemente auf. Insbesondere unterscheiden sich die Schaltelemente von Schaltelementen mit parallel geschaltetem Gleichrichterelement. Unter einem "Schaltelement" soll insbesondere ein elektronisches Element verstanden werde" das dazu vorgesehen ist, zwischen zwei Punkten, insbesondere Kontakten des Schaltelements, eine elektrisch leitende Verbindung herzustellen und/oder zu trennen. Vorzugsweise weist das Schaltelement zumindest einen Steuerkontakt auf, über den es geschaltet werden kann. Insbesondere ist das Schaltelement als Halbleiterschaltelement, insbesondere als Transistor, vorteilhaft als Bipolartransistor mit vorzugsweise isolierter Gate-Elektrode (IGBT), ausgebildet. Alternativ ist das Schaltelement als mechanisches und/oder elektromechanisches Schaltelement, insbesondere als ein Relais, ausgebildet. Es kann insbesondere eine effiziente Versorgung der Induktionsheizeinheit erreicht werden.Furthermore, it is proposed that the induction heating device has at least one heating frequency unit which is provided to receive energy in at least one operating state via the rectifier unit and to supply at least one induction heating unit with a high-frequency alternating current. In particular, the induction heating device has at least one induction heating 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 heater" should in particular be understood to mean a heating element with at least one induction heating line, which is intended to pass through Induction effects, in particular induction of electric current and / or Ummagnetisierungseffekte, in one, preferably ferromagnetic, in particular metallic, heating means, in particular in a cooking utensil, in an oven wall and / or in a radiator, which is arranged in an oven to cause heating of the heating means. In particular, the induction heating element is provided to transmit in at least one operating mode in which the induction heating is connected to a supply electronics, a power of at least 100 W, in particular at least 500 W, advantageously at least 1000 W, preferably at least 2000 W, in particular electrical energy into electromagnetic field energy, which is finally converted into heat in a suitable heating medium. An "induction heating line" is to be understood as meaning, in particular, an electrical line which is intended to carry an electric current which is intended to induce induction effects in a suitable heating means. Preferably, the induction heating is as inductance, in particular as a coil, advantageously as a flat coil, preferably at least substantially in the form of a circular disc, alternatively in the form of an oval or a rectangle formed. In particular, the induction heating line, in particular with a coupled heating means, has an inductance of at least 1 nH, in particular at least 10 nH, advantageously at least 20 nH. In particular, the induction heating line, in particular without a coupled heating means, has an inductance of not more than 1000 nH, in particular not more than 100 nH, advantageously not more than 50 nH. Preferably, the induction heating is intended, at least in an operating state of high-frequency alternating current, in particular an alternating current having a frequency of at least 20 kHz, in particular at least 30 kHz, advantageously at least 50 kHz, preferably at least 60 kHz, in particular at most 500 kHz, in particular with a current strength of at least 0.5 A, in particular at least 1 A, advantageously at least 3 A, preferably at least 10 A, to be flowed through. A "heating frequency unit" should in particular be understood to mean an electrical unit which has an oscillating electrical signal, preferably with a frequency of at least 20 kHz, in particular of at least 30 kHz, advantageously of at least 50 kHz, and in particular of not more than 500 kHz, for at least one Induced heating unit generates. In particular, the Heizfrequenzeinheit is provided to at least one operating state, a DC voltage, a pulsating DC voltage and / or an AC voltage, in particular an AC voltage having a frequency of less than 200 Hz, in particular less than 60 Hz, advantageously less than 50 Hz, in a high-frequency To convert AC voltage. In particular, at least the Heizfrequenzeinheit provided to provide a, required by the induction heating unit, maximum electrical power of at least 1000 W, in particular at least 2000 W, advantageously at least 3000 W and preferably at least 3700 W. In particular, the heating frequency unit is designed as an inverter. In particular, the heating frequency unit has at least one, preferably at least two, switching elements. In particular, the switching elements of switching elements with parallel rectifier element differ. A "switching element" is to be understood in particular to mean an electronic element which is intended to produce and / or to separate an electrically conductive connection between two points, in particular contacts of the switching element In particular, the switching element is designed as a semiconductor switching element, in particular as a transistor, advantageously as a bipolar transistor with preferably insulated gate electrode (IGBT) Alternatively, the switching element is designed as a mechanical and / or electromechanical switching element, in particular as a relay In particular, an efficient supply of the induction heating unit can be achieved.

Ferner wird vorgeschlagen, dass die Induktionsheizvorrichtung zumindest eine Resonanzeinheit aufweist, die dazu vorgesehen ist, mit einer Induktionsheizeinheit zumindest einen Resonanzteilkreis zu bilden, und die in zumindest einem Betriebszustand direkt mit der Elektroenergiequelle verbunden ist. Unter einer "Resonanzeinheit" soll insbesondere eine Einheit verstanden werden, die zumindest eine Resonanzkapazität, die vorzugsweise von zumindest einem Kondensator gebildet ist, umfasst, die vorzugsweise von einer Dämpfungskapazität und/oder einer Kapazität, die zu einem Schaltelement parallelgeschaltet ist, verschieden ist. Insbesondere ist eine Resonanzkapazität von einer Kombination aus Reihen- und Parallelschaltungen von mehreren Kondensatoren gebildet. Unter einem "Resonanzteilkreis" soll insbesondere ein Teil eines Schaltkreises verstanden werden, in dem zumindest eine Resonanzkapazität der Resonanzeinheit in Reihe und/oder parallel zu der Induktionsheizeinheit geschaltet ist. Vorzugsweise beträgt eine Resonanzfrequenz des Resonanzteilkreises zumindest 30 kHz, insbesondere zumindest 50 kHz, vorteilhaft zumindest 70 kHz, vorzugsweise zumindest 100 kHz. Insbesondere ist die Resonanzkapazität direkt mit der Induktionsheizeinheit verbunden. Insbesondere weist der zumindest eine Resonanzteilkreis zumindest einen Kontakt auf, der mit einem gemeinsamen Leistungskontakt zweier Schaltelemente der Heizfrequenzeinheit direkt verbunden ist. Insbesondere ist die zumindest eine Resonanzkapazität dazu vorgesehen, in zumindest einem Betriebszustand, über zumindest eines der Schaltelemente und die Induktionsheizeinheit geladen und/oder entladen zu werden. 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 500 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 500 kHz um maximal 100 %, insbesondere maximal 40 %, vorteilhaft maximal 10 % und vorzugsweise maximal 3 %, schwankt. Unter einer "Impedanz" soll insbesondere eine Division einer Effektivspannung durch einen Effektivstrom der elektrischen Verbindung verstanden werden. Insbesondere sind Außenkontakte der Resonanzeinheit direkt mit Kontakten der Elektroenergiequelle verbunden. Unter einem "Außenkontakt" der Resonanzeinheit soll insbesondere ein Kontakt verstanden werden, der mit genau einer Resonanzkapazität der Resonanzeinheit direkt verbunden ist. Es kann insbesondere ein effektiver Betrieb erreicht werden.It is further proposed that the induction heating device has at least one resonance unit, which is provided to form at least one resonant subcircuit with an induction heating unit, and which is connected directly to the electric energy source in at least one operating state. A "resonance unit" is to be understood in particular as a unit which comprises at least one resonance capacitance, which is preferably formed by at least one capacitor, which is preferably different from a damping capacity and / or a capacitance connected in parallel with a switching element. In particular, a resonant capacitance is formed by a combination of series and parallel circuits of a plurality of capacitors. A "resonant subcircuit" is to be understood, in particular, as part of a circuit in which at least one resonant capacitance of the resonant unit is connected in series and / or parallel to the induction heating unit. Preferably, a resonant frequency of the resonant subcircuit is at least 30 kHz, in particular at least 50 kHz, advantageously at least 70 kHz, preferably at least 100 kHz. In particular, the resonance capacity is directly connected to the induction heating unit. In particular, the at least one resonance subcircuit has at least one contact, which is directly connected to a common power contact of two switching elements of the heating frequency unit. In particular, the at least one resonance capacitor is provided to be charged and / or discharged in at least one operating state, via at least one of the switching elements and the induction heating unit. 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 500 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 in particular over a frequency range from 1 kHz to 500 kHz by a maximum of 100%, in particular a maximum of 40%, advantageously a maximum 10%, and preferably at most 3%, varies. An "impedance" should be understood in particular to mean a division of an effective voltage by an effective current of the electrical connection. In particular, external contacts of the resonance unit are connected directly to contacts of the electric power source. An "external contact" of the resonance unit should in particular be understood as a contact which is directly connected to exactly one resonance capacity of the resonance unit. In particular, an effective operation can be achieved.

Weiterhin wird vorgeschlagen, dass die Induktionsheizvorrichtung zumindest eine Induktionsheizeinheit aufweist, die zumindest halbbrückenartig beschaltet ist. Unter "halbbrückenartig beschaltet" soll insbesondere verstanden werden, dass zumindest die Induktionsheizeinheit in einem Brückenzweig zwischen einen gemeinsamen Kontakt zweier Schaltelemente der Heizfrequenzeinheit und einen gemeinsamen Kontakt zweier Resonanzkapazitäten der Resonanzeinheit geschaltet ist. Unter einem gemeinsamen Kontakt zweier elektrischer Elemente soll insbesondere ein Kontakt verstanden werden, der mit beiden elektrischen Elementen direkt verbunden ist. Es kann insbesondere ein effektiver Betrieb erreicht werden.Furthermore, it is proposed that the induction heating device has at least one induction heating unit which is connected at least in the manner of a half bridge. The term "half-bridge type" should in particular be understood to mean that at least the induction heating unit is connected in a bridge branch between a common contact of two switching elements of the heating frequency unit and a common contact of two resonance capacitances of the resonance unit. A common contact of two electrical elements is to be understood in particular as a contact which is directly connected to both electrical elements. In particular, an effective operation can be achieved.

Ferner wird vorgeschlagen, dass die Induktionsheizvorrichtung zumindest eine Resonanzeinheit aufweist, die zumindest einen Außenkontakt aufweist, der über zumindest ein Gleichrichterelement in zumindest einer Richtung mit zumindest einem Schaltelement der Heizfrequenzeinheit elektrisch leitfähig verbunden ist, wobei sich die Verbindung von einer Verbindung unterscheidet, die ein elektrisches Bauelement der Resonanzeinheit aufweist. Insbesondere ist der Außenkontakt über zumindest ein weiteres Gleichrichterelement in zumindest einer Richtung mit einem weiteren Schaltelement der Heizfrequenzeinheit elektrisch leitfähig verbunden. Insbesondere weist die Resonanzeinheit zumindest einen weiteren Außenkontakt auf, der über zumindest ein weiteres Gleichrichterelement in zumindest einer Richtung mit zumindest einem Schaltelement der Heizfrequenzeinheit elektrisch leitfähig verbunden ist. Insbesondere weist jeder Resonanzkreis zumindest ein, insbesondere genau ein Gleichrichterelement auf. Unter einem "Resonanzkreis" soll insbesondere ein geschlossener elektrischer Teilschaltkreis verstanden werden, der in zumindest einem Betriebszustand in zumindest eine Richtung von Strom durchflossen werden kann und der zumindest die Induktionsheizeinheit und zumindest eine Resonanzkapazität aufweist. Unter einem Teilschaltkreis soll insbesondere ein unverzweigter Pfad entlang von Elementen eines elektrischen Schaltkreises verstanden werden. Vorteilhaft ist das Gleichrichterelement ein Gleichrichterelement der Gleichrichtereinheit, wodurch eine Teileersparnis erreicht werden kann. Es können, insbesondere durch eine Verringerung und/oder Vermeidung von Rücklaufströmen, insbesondere von Resonanzumkehrströmen, Schaltverluste minimiert werden, wodurch eine Effizienz der Induktionsheizvorrichtung gesteigert werden kann. Insbesondere in einer derartigen Ausgestaltung kommt die erfindungsgemäße Wahl der Gleichrichterelemente als schnellerholende Gleichrichterelemente vorteilhaft zum tragen.It is furthermore proposed that the induction heating device has at least one resonance unit which has at least one external contact which is electrically conductively connected in at least one direction to at least one switching element of the heating frequency unit via at least one rectifier element, the connection being different from a connection having an electrical connection Component of the resonance unit has. In particular, the external contact is over at least one another rectifier element electrically conductively connected in at least one direction with another switching element of the heating frequency unit. In particular, the resonance unit has at least one further external contact, which is electrically conductively connected to at least one switching element of the heating frequency unit via at least one further rectifier element in at least one direction. In particular, each resonant circuit has at least one, in particular exactly one rectifier element. A "resonant circuit" is to be understood, in particular, as a closed electrical subcircuit, which in at least one operating state can be traversed by current in at least one direction and which has at least the induction heating unit and at least one resonant capacitance. A subcircuit is to be understood, in particular, as an unbranched path along elements of an electrical circuit. Advantageously, the rectifier element is a rectifier element of the rectifier unit, whereby a part savings can be achieved. It can, in particular by reducing and / or avoiding return currents, in particular resonant reverse currents, switching losses are minimized, whereby an efficiency of the induction heater can be increased. In particular, in such a configuration, the choice of rectifier elements according to the invention as an advantage faster recovering rectifier elements advantageous.

Vorteilhaft ist in zumindest einem Betriebsmodus, insbesondere in jedem Betriebsmodus maximal ein Gleichrichterelement der Gleichrichtereinheit, insbesondere maximal ein Gleichrichterelement der Induktionsheizvorrichtung, gleichzeitig leitend. Darunter, dass ein Gleichrichterelement "leitend" ist, soll insbesondere verstanden werden, dass es von einem Strom, insbesondere einem Strom von zumindest 0,01 A, insbesondere zumindest 0,1 A, vorteilhaft zumindest 1 A, durchflossen wird. Es kann insbesondere eine höhere Effizienz erreicht werden, da Verlustleistungen durch zusätzliche Bauteile vermieden werden können.In at least one operating mode, in particular in each operating mode, at most one rectifier element of the rectifier unit, in particular at most one rectifier element of the induction heater, is simultaneously conducting. By the fact that a rectifier element is "conductive" should be understood in particular that it is from a current, in particular a current of at least 0.01 A, in particular at least 0.1 A, preferably at least 1 A, flows through. In particular, a higher efficiency can be achieved because power losses can be avoided by additional components.

Weiterhin wird vorgeschlagen, dass die Induktionsheizvorrichtung zumindest eine Pufferkapazität aufweist, die direkt mit der Elektroenergiequelle verbunden, insbesondere dieser parallel geschaltet ist. Es kann insbesondere ein verbesserter Leistungsfaktor erreicht werden. Insbesondere können Stromspitzen abgefangen werden.Furthermore, it is proposed that the induction heating device has at least one buffer capacity, which is connected directly to the electric power source, in particular this is connected in parallel. In particular, an improved power factor can be achieved. In particular, current peaks can be intercepted.

Ferner wird vorgeschlagen, dass die Induktionsheizvorrichtung zumindest eine Steuereinheit aufweist, die dazu vorgesehen ist, die Heizfrequenzeinheit in zumindest einem Betriebsmodus mit einer Frequenz zu betreiben, die kleiner ist als eine Resonanzfrequenz, die durch eine Induktionsheizeinheit und eine Resonanzeinheit gegeben ist. Insbesondere ist die Steuereinheit dazu vorgesehen, hochfrequente Schaltsignale zu erzeugen und damit den zumindest einen Schaltkontakt des zumindest einen Schaltelements der Heizfrequenzeinheit anzusteuern. Insbesondere ist die Steuereinheit dazu vorgesehen, in Abhängigkeit von einer Bedienereingabe eine Heizleistung der Induktionsheizeinheit einzustellen. Insbesondere weist die Steuereinheit zumindest eine Recheneinheit und vorzugsweise zumindest eine Speichereinheit auf, in der insbesondere ein Betriebsprogramm abgespeichert ist, das zumindest in einem Betriebszustand von der Recheneinheit ausgeführt wird. Es kann insbesondere eine einfachere Steuerung erreicht werden. Insbesondere kann eine zumindest im Wesentlichen lineare Frequenz-Leistungsabhängigkeit erreicht werden.It is further proposed that the induction heating device has at least one control unit which is provided to operate the heating frequency unit in at least one operating mode with a frequency that is smaller than a resonance frequency, which is given by an induction heating unit and a resonance unit. In particular, the control unit is provided to generate high-frequency switching signals and thus to control the at least one switching contact of the at least one switching element of the heating frequency unit. In particular, the control unit is provided to set a heating power of the induction heating unit as a function of an operator input. In particular, the control unit has at least one arithmetic unit and preferably at least one memory unit in which, in particular, an operating program is stored which is executed by the arithmetic unit at least in an operating state. In particular, a simpler control can be achieved. In particular, an at least substantially linear frequency power dependency can be achieved.

Weiterhin wird ein Hausgerät, insbesondere Gargerät, vorteilhaft Backofen und/oder Kochfeld, mit einer erfindungsgemäßen Induktionsheizvorrichtung vorgeschlagen.Furthermore, a domestic appliance, in particular cooking appliance, advantageously oven and / or hob, proposed with an induction heating according to the invention.

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
eine schematische Ansicht eines Kochfelds mit einer erfindungsgemäßen Induktionsheizvorrichtung,
Fig. 2
ein elektrisches Schaltbild einer erfindungsgemäßen Induktionsheizvorrichtung und
Fig. 3
eine schematische Darstellung eines Kenngrößenverlaufs einer erfindungsgemäßen Induktionsheizvorrichtung.
Show it:
Fig. 1
a schematic view of a hob with an induction heating device according to the invention,
Fig. 2
an electrical circuit diagram of an induction heater according to the invention and
Fig. 3
a schematic representation of a characteristic curve of an induction heating device according to the invention.

Figur 1 zeigt ein als Kochfeld ausgebildetes Hausgerät 10. Das Hausgerät 10 weist vier Induktionsheizeinheiten 20, 22, 24, 26 auf. Die Induktionsheizeinheiten 20, 22, 24, 26 sind als Kochfeldinduktoren ausgebildet, die unter einer Kochfeldplatte angeordnet sind. Weiterhin weist das Hausgerät 10 eine Leistungselektronikeinheit 14 auf, die dazu vorgesehen ist, die Induktionsheizeinheiten 20, 22, 24, 26 mit Energie zu versorgen. Die Leistungselektronikeinheit 14 und die Induktionsheizeinheiten 20, 22, 24, 26 sind Teil von Induktionsheizvorrichtungen 12. FIG. 1 shows a cooking appliance designed as a domestic appliance 10. The domestic appliance 10 has four induction heating units 20, 22, 24, 26. The induction heating units 20, 22, 24, 26 are designed as cooktop inductors, which are arranged under a cooktop panel. Furthermore, the domestic appliance 10 has a power electronics unit 14, which is provided to supply the induction heating units 20, 22, 24, 26 with energy. The power electronics unit 14 and the induction heating units 20, 22, 24, 26 are part of induction heaters 12.

Figur 2 zeigt eine Induktionsheizvorrichtung 12 mit der Induktionsheizeinheit 20. Die Induktionsheizvorrichtung 12 weist eine Gleichrichtereinheit 30 auf. Die Induktionsheizeinheit 20 ist hierbei durch eine Reihenschaltung einer Spule und eines Widerstandes, der für eine elektrische Leistungsabnahme durch ein Gargeschirr steht, dargestellt. Weiterhin weist die Induktionsheizvorrichtung 12 eine Heizfrequenzeinheit 50 auf, die dazu vorgesehen ist, in verschiedenen Betriebsmodi die Induktionsheizeinheit 20 mit hochfrequentem Wechselstrom zu versorgen. Die Gleichrichtereinheit 30 weist vier schnellerholende Gleichrichterelemente 32, 34, 36, 38 auf. Die Gleichrichtereinheit 30 ist dazu vorgesehen, Spannung und Strom einer Elektroenergiequelle 18, die an Eingangskontakten 42 und 44 der Gleichrichtereinheit 30 anliegen, gleichzurichten und einer Heizfrequenzeinheit 50 zuzuführen. Die Heizfrequenzeinheit 50 ist dazu vorgesehen, in dem einen Betriebszustand Energie über die Gleichrichtereinheit 30 zu beziehen. Die Gleichrichterelemente 32, 34, 36, 38 sind als Dioden ausgebildet. Die Induktionsheizvorrichtung 12 weist eine Pufferkapazität 40 auf, die zwischen die Eingangskontakte 42, 44 der Gleichrichtereinheit 30 geschaltet ist und damit direkt mit der Elektroenergiequelle 18 verbunden ist. Weiterhin weist die Gleichrichtereinheit 30 zwei Ausgangskontakte 56, 57 auf, mit denen die Heizfrequenzeinheit 50 direkt verbunden ist. FIG. 2 shows an induction heating device 12 with the induction heating unit 20. The induction heating device 12 comprises a rectifier unit 30. The induction heating unit 20 is hereby represented by a series connection of a coil and a resistor, which stands for an electric power decrease by a cooking utensil. Furthermore, the induction heating device 12 has a heating frequency unit 50, which is provided to supply the induction heating unit 20 with high-frequency alternating current in various operating modes. The rectifier unit 30 has four faster-recovery rectifier elements 32, 34, 36, 38. The rectifier unit 30 is provided to rectify voltage and current of an electric power source 18, which are applied to input contacts 42 and 44 of the rectifier unit 30, and to supply a heating frequency unit 50. The heating frequency unit 50 is provided to receive energy in the one operating state via the rectifier unit 30. The rectifier elements 32, 34, 36, 38 are formed as diodes. The induction heating device 12 has a buffer capacity 40 which is connected between the input contacts 42, 44 of the rectifier unit 30 and is thus connected directly to the electric power source 18. Furthermore, the rectifier unit 30 has two output contacts 56, 57, to which the heating frequency unit 50 is directly connected.

Ein erstes Gleichrichterelement 32 verbindet einen ersten Eingangskontakt 42 der Gleichrichtereinheit 30 mit einem ersten Ausgangskontakt 56 der Gleichrichtereinheit 30, so dass ein Stromfluss zum ersten Ausgangskontakt 56 möglich ist. Ein zweites Gleichrichterelement 34 verbindet einen zweiten Ausgangskontakt 57 der Gleichrichtereinheit 30 mit einem zweiten Eingangskontakt 44 der Gleichrichtereinheit 30, so dass ein Stromfluss zum zweiten Eingangskontakt 44 möglich ist. Ein drittes Gleichrichterelement 36 verbindet den zweiten Eingangskontakt 44 mit dem ersten Ausgangskontakt 56, so dass ein Stromfluss zum ersten Ausgangskontakt 56 möglich ist. Ein viertes Gleichrichterelement 38 verbindet den zweiten Ausgangskontakt 57 mit dem ersten Eingangskontakt 42, so dass ein Stromfluss zum ersten Eingangskontakt 42 möglich ist.A first rectifier element 32 connects a first input contact 42 of the rectifier unit 30 to a first output contact 56 of the rectifier unit 30, so that a current flow to the first output contact 56 is possible. A second rectifier element 34 connects a second output contact 57 of the rectifier unit 30 to a second input contact 44 of the rectifier unit 30, so that a current flow to the second input contact 44 is possible. A third rectifier element 36 connects the second input contact 44 to the first output contact 56, so that a current flow to the first output contact 56 is possible. A fourth rectifier element 38 connects the second output contact 57 to the first input contact 42, so that a current flow to the first input contact 42 is possible.

Die Heizfrequenzeinheit 50 ist von zwei Schaltelementen 52, 53 gebildet. Die Schaltelemente 52, 53 sind als IGBTs ausgebildet. Ein erstes Schaltelement 52 der Heizfrequenzeinheit 50 weist einen Eingangskontakt auf, der direkt mit dem ersten Ausgangskontakt 56 der Gleichrichtereinheit 30 verbunden ist. Ein zweites Schaltelement 53 der Heizfrequenzeinheit 50 weist einen Ausgangskontakt auf, der direkt mit dem zweiten Ausgangskontakt 57 der Gleichrichtereinheit 30 verbunden ist. Das erste Schaltelement 52 weist einen Ausgangskontakt auf, der direkt mit einem Eingangskontakt des zweiten Schaltelements 53 über einen gemeinsamen Kontakt 51 verbunden ist.The heating frequency unit 50 is formed by two switching elements 52, 53. The switching elements 52, 53 are designed as IGBTs. A first switching element 52 of the heating frequency unit 50 has an input contact, which is connected directly to the first output contact 56 of the rectifier unit 30. A second switching element 53 of the heating frequency unit 50 has an output contact which is directly connected to the second output contact 57 of the rectifier unit 30. The first switching element 52 has an output contact which is directly connected to an input contact of the second switching element 53 via a common contact 51.

Weiterhin weist die Induktionsheizvorrichtung 12 eine Resonanzeinheit 60 auf, die dazu vorgesehen ist, mit der Induktionsheizeinheit 20 zwei Resonanzteilkreise zu bilden. Die Resonanzeinheit 60 weist zwei Resonanzkapazitäten 62, 64 auf. Eine erste Resonanzkapazität 62 und eine zweite Resonanzkapazität 64 bilden jeweils mit der Induktionsheizeinheit 20 einen Resonanzteilkreis mit einer gleichen Resonanzfrequenz. Die Resonanzfrequenz nimmt in Abhängigkeit von einem genutzten Gargeschirr, das eine Induktivität der Induktionsheizeinheit 20 beeinflusst, einen Wert zwischen 20 kHz und 100 kHz an. Die beiden Resonanzkapazitäten 62, 64 sind über einen gemeinsamen Kontakt 61 direkt miteinander verbunden. Die erste Resonanzkapazität 62 weist einen weiteren Kontakt auf, der einen ersten Außenkontakt 63 der Resonanzeinheit 60 bildet. Die zweite Resonanzkapazität 64 weist einen weiteren Kontakt auf, der einen zweiten Außenkontakt 65 der Resonanzeinheit 60 bildet. Der erste Außenkontakt 63 ist direkt mit dem zweiten Eingangskontakt 44 der Gleichrichtereinheit 30 und somit mit der Elektroenergiequelle 18 verbunden. Der zweite Außenkontakt 65 ist direkt mit dem ersten Eingangskontakt 42 der Gleichrichtereinheit 30 und somit mit der Elektroenergiequelle 18 verbunden. Die Resonanzeinheit 60 ist in einem Betriebszustand direkt mit der Elektroenergiequelle 18 verbunden.Furthermore, the induction heating device 12 has a resonance unit 60, which is provided to form two resonance subcircuits with the induction heating unit 20. The resonance unit 60 has two resonance capacitances 62, 64. A first resonance capacitance 62 and a second resonance capacitance 64 each form, with the induction heating unit 20, a resonant pitch circuit having a same resonance frequency. The resonant frequency takes on a value between 20 kHz and 100 kHz depending on a used cooking utensil which influences an inductance of the induction heating unit 20. The two resonance capacitances 62, 64 are connected directly to one another via a common contact 61. The first resonant capacitance 62 has a further contact, which forms a first external contact 63 of the resonance unit 60. The second resonant capacitance 64 has a further contact, which forms a second external contact 65 of the resonance unit 60. The first external contact 63 is connected directly to the second input contact 44 of the rectifier unit 30 and thus to the electric power source 18. The second external contact 65 is connected directly to the first input contact 42 of the rectifier unit 30 and thus to the electric power source 18. The resonance unit 60 is directly connected to the electric power source 18 in an operating state.

Die Induktionsheizeinheit 20 ist halbbrückenartig beschaltet. Die Induktionsheizeinheit 20 ist in einem Brückenzweig zwischen den gemeinsamen Kontakten 51, 61 der Heizfrequenzeinheit 50 und der Resonanzeinheit 60 angeordnet.The induction heating unit 20 is connected in a half-bridge manner. The induction heating unit 20 is disposed in a bridge branch between the common contacts 51, 61 of the heating frequency unit 50 and the resonance unit 60.

Der erste Außenkontakt 63 ist über das Gleichrichterelement 36 mit dem ersten Ausgangskontakt 56 und somit mit dem ersten Schaltelement 52 elektrisch leitfähig verbunden. Weiterhin ist der erste Außenkontakt 63 über das Gleichrichterelement 34 mit dem zweiten Ausgangskontakt 57 und somit mit dem zweiten Schaltelement 53 elektrisch leitfähig verbunden. Der zweite Außenkontakt 65 ist über das Gleichrichterelement 32 mit dem ersten Ausgangskontakt 56 und somit mit dem ersten Schaltelement 52 elektrisch leitfähig verbunden. Weiterhin ist der zweite Außenkontakt 65 über das Gleichrichterelement 38 mit dem zweiten Ausgangskontakt 57 und somit mit dem zweiten Schaltelement 53 elektrisch leitfähig verbunden. In jedem Resonanzkreis ist genau ein Gleichrichterelement 32, 34, 36, 38 der Gleichrichtereinheit 30 angeordnet.The first external contact 63 is electrically conductively connected via the rectifier element 36 to the first output contact 56 and thus to the first switching element 52. Furthermore, the first external contact 63 is electrically conductively connected via the rectifier element 34 to the second output contact 57 and thus to the second switching element 53. The second external contact 65 is electrically conductively connected via the rectifier element 32 to the first output contact 56 and thus to the first switching element 52. Furthermore, the second external contact 65 is electrically conductively connected via the rectifier element 38 to the second output contact 57 and thus to the second switching element 53. In each resonant circuit exactly one rectifier element 32, 34, 36, 38 of the rectifier unit 30 is arranged.

Die Induktionsheizvorrichtung 12 weist eine Steuereinheit 16 auf, die dazu vorgesehen ist, die Heizfrequenzeinheit 50 in unterschiedlichen Betriebsmodi, beispielsweise bei unterschiedlichen angeforderten Heizleistungen, mit einer Frequenz zu betreiben, die kleiner ist als die Resonanzfrequenz, die durch die Induktionsheizeinheit 20 und die Resonanzeinheit 60 gegeben ist. Die Schaltelemente 52, 53 weisen jeweils einen Steuerkontakt 54, 55 auf. Die Steuereinheit 16 ist dazu vorgesehen, die Steuerkontakte 54, 55 der Schaltelemente 52, 53 separat mit jeweils einer Ansteuerkenngröße S1, S2, beispielsweise einem Schaltstrom oder einer Schaltspannung, anzusteuern, um Schaltzustände der Schaltelemente 52, 53 zu verändern, also zwischen einem Leitungszustand und einem Trennzustand umzuschalten. Die Steuereinheit 16 ist dazu vorgesehen, die Heizfrequenzeinheit 50 und die Schaltelemente 52, 53 in jedem Betriebsmodus mit einer Frequenz zu betreiben, die kleiner ist als die Resonanzfrequenz, die durch die Induktionsheizeinheit 20 und die Resonanzeinheit 60 gegeben ist.The induction heating device 12 has a control unit 16 which is provided to operate the heating frequency unit 50 in different operating modes, for example at different requested heating powers, at a frequency which is lower than the resonance frequency given by the induction heating unit 20 and the resonance unit 60 is. The switching elements 52, 53 each have a control contact 54, 55. The control unit 16 is provided to control the control contacts 54, 55 of the switching elements 52, 53 separately with a respective Ansteuerkenngröße S 1 , S 2 , for example, a switching current or a switching voltage to change switching states of the switching elements 52, 53, ie between a Change line state and a disconnected state. The control unit 16 is provided to operate the heating frequency unit 50 and the switching elements 52, 53 in each operation mode at a frequency smaller than the resonance frequency given by the induction heating unit 20 and the resonance unit 60.

In jedem regulären Betriebsmodus, in dem maximal eines der Schaltelemente 52, 53 gleichzeitig geöffnet ist, leitet maximal eines der Gleichrichterelemente 32, 34, 36, 38 der Gleichrichtereinheit 30 gleichzeitig. In einem ersten Betriebszustand, in dem an dem ersten Eingangskontakt 42 der Gleichrichtereinheit 30 eine positive Spannung anliegt und das erste Schaltelement 52 in einem Leitungszustand ist, leitet maximal das erste Gleichrichterelement 32. In einem zweiten Betriebszustand, in dem an dem ersten Eingangskontakt 42 der Gleichrichtereinheit 30 eine positive Spannung anliegt und das zweite Schaltelement 53 in einem Leitungszustand ist, leitet maximal das zweite Gleichrichterelement 34. In einem dritten Betriebszustand, in dem an dem ersten Eingangskontakt 42 der Gleichrichtereinheit 30 eine negative Spannung anliegt und das erste Schaltelement 52 in einem Leitungszustand ist, leitet maximal das dritte Gleichrichterelement 36. In einem vierten Betriebszustand, in dem an dem ersten Eingangskontakt 42 der Gleichrichtereinheit 30 eine negative Spannung anliegt und das zweite Schaltelement 53 in einem Leitungszustand ist, leitet maximal das vierte Gleichrichterelement 38.In each regular operating mode, in which at most one of the switching elements 52, 53 is opened at the same time, at most one of the rectifier elements 32, 34, 36, 38 of the rectifier unit 30 conducts simultaneously. In a first operating state, in which a positive voltage is applied to the first input contact 42 of the rectifier unit 30 and the first switching element 52 is in a conduction state, the first rectifier element 32 conducts at most. In a second operating state, in which at the first input contact 42 of the rectifier unit 30 is a positive voltage and the second switching element 53 is in a conduction state, the maximum directs the second rectifier element 34. In a third operating state in which applied to the first input contact 42 of the rectifier unit 30, a negative voltage and the In a fourth operating state, in which a negative voltage is applied to the first input contact 42 of the rectifier unit 30 and the second switching element 53 is in a conduction state, the fourth rectifier element 38 conducts at most ,

Figur 3 zeigt den Verlauf verschiedener Kenngrößen S1, S2, U1, U2, I1, I2, IL der Induktionsheizvorrichtung 12 in mehreren, übereinander angeordneten Diagrammen in Abhängigkeit von einer Zeit t für einen einzelnen Steuerzyklus für den Fall einer positiven Spannung am ersten Eingangskontakt 42. Die Steuerzyklen wiederholen sich hierbei periodisch. In einem obersten, ersten Diagramm ist eine erste Ansteuerkenngröße S1 des ersten Schaltelements 52 dargestellt, in deren Abhängigkeit sich der Schaltzustand des ersten Schaltelements 52 ändert. In einem zweiten Diagramm ist eine erste Spannung U1 dargestellt, die über dem ersten Schaltelement 52, gemessen vom ersten Ausgangskontakt 56 zum gemeinsamen Kontakt 51, abfällt. Im dritten Diagramm ist ein erster Strom I1 dargestellt, der durch das erste Schaltelement 52 vom Ausgangskontakt 56 zum gemeinsamen Kontakt 51 fließt. In einem vierten Diagramm von oben ist eine zweite Ansteuerkenngröße S2 des zweiten Schaltelements 53 dargestellt, in deren Abhängigkeit sich der Schaltzustand des zweiten Schaltelements 53 ändert. In einem fünften Diagramm ist eine zweite Spannung U2 dargestellt, die über dem zweiten Schaltelement 53, gemessen vom gemeinsamen Kontakt 51 zum zweiten Ausgangskontakt 57, abfällt. Im sechsten Diagramm ist ein zweiter Strom I2 dargestellt, der durch das zweite Schaltelement 53 vom gemeinsamen Kontakt 51 zum zweiten Ausgangskontakt 57 fließt. In einem untersten, siebten Diagramm ist ein Leistungsstrom IL dargestellt, der vom gemeinsamen Kontakt 51 der Schaltelemente 52, 53 zum gemeinsamen Kontakt 61 der Resonanzkapazitäten 62, 64 fließt. FIG. 3 shows the course of various characteristics S 1 , S 2 , U 1 , U 2 , I 1 , I 2 , I L of the induction heater 12 in a plurality of superimposed diagrams in response to a time t for a single control cycle in the case of a positive voltage at the first input contact 42. The control cycles are repeated periodically. In a top, first diagram, a first control characteristic S 1 of the first switching element 52 is shown, in dependence of which the switching state of the first switching element 52 changes. In a second diagram, a first voltage U 1 is shown, which drops above the first switching element 52, measured from the first output contact 56 to the common contact 51. In the third diagram, a first current I 1 is shown flowing through the first switching element 52 from the output contact 56 to the common contact 51. In a fourth diagram from above, a second control characteristic S 2 of the second switching element 53 is shown, in dependence of which the switching state of the second switching element 53 changes. In a fifth diagram, a second voltage U 2 is shown, which drops across the second switching element 53, measured from the common contact 51 to the second output contact 57. In the sixth diagram, a second current I 2 is shown, which flows through the second switching element 53 from the common contact 51 to the second output contact 57. In a bottom, seventh diagram, a power current I L is shown, which flows from the common contact 51 of the switching elements 52, 53 to the common contact 61 of the resonance capacitances 62, 64.

Zu einem Anfangszeitpunkt t0 wird durch Setzen der ersten Ansteuerkenngröße S1 auf einen Schaltwert das erste Schaltelement 52 in den Leitungszustand versetzt, nachdem durch Zurücksetzen der zweiten Ansteuerkenngröße S2 auf Null das zweite Schaltelement 53 in den Trennzustand versetzt wurde. Die zweite Resonanzkapazität 64 entlädt sich daraufhin über das erste Gleichrichterelement 32, das erste Schaltelement 52 und die Induktionsheizeinheit 20. Weiterhin lädt gleichgerichteter Strom vom ersten Ausgangskontakt 56 über das erste Schaltelement 52 und die Induktionsheizeinheit 20 die erste Resonanzkapazität 62. Die Induktionsheizeinheit 20 verzögert zunächst einen Anstieg des ersten Stroms I1. Über dem ersten Schaltelement 52 liegt eine Spannung von nahezu 0V an. Über dem zweiten Schaltelement 53, die im Trennzustand ist, fällt entsprechend, eine von der Gleichrichtereinheit 30 gelieferte Spannung ab. Der Leistungsstrom IL entspricht dem ersten Strom I1.At an initial time t 0 , by setting the first control characteristic S 1 to a switching value, the first switching element 52 is placed in the line state after the second switching element 53 has been set to the disconnected state by resetting the second control characteristic S 2 to zero. The second resonant capacitance 64 then discharges via the first rectifier element 32, the first switching element 52 and the induction heating unit 20. Further, rectified current from the first output contact 56 via the first switching element 52 and the induction heating unit 20 charges the first resonant capacitance 62. The induction heating unit 20 initially delays one Increase of the first current I 1 . Above the first switching element 52 is a voltage of almost 0V. Accordingly, a voltage supplied from the rectifier unit 30 drops across the second switching element 53, which is in the disconnected state. The power current I L corresponds to the first current I 1 .

Zu einem ersten Zeitpunkt t1 kommt der Leistungsstrom IL durch die Induktionsheizeinheit 20 zum Erliegen. Ein Kehrwert eines Doppelten der Zeitdifferenz t1 - t0, entspricht der Eigenfrequenz der Resonanzteilkreise. Zuvor wurde durch Selbstinduktion der Induktionsheizeinheit 20 die zweite Resonanzkapazität 64 teilweise mit einer Gegenspannung geladen und die erste Resonanzkapazität 62 über die Spannung hinaus, die von der Gleichrichtereinheit 30 geliefert wird, mit einer Überspannung geladen. Die Gegenspannung fällt ab dem Zeitpunkt t1 rückwärtig an dem ersten Gleichrichterelement 32 an. Die Überspannung fällt ab dem Zeitpunkt t1 als zweite Spannung U2 an dem zweiten Schaltelement 53 an.At a first time t 1 , the power current I L comes to a stop by the induction heating unit 20. A reciprocal of twice the time difference t 1 -t 0 corresponds to the natural frequency of the resonant subcircuits. Previously, by self-induction of the induction heating unit 20, the second resonance capacitance 64 was partially charged with a back voltage, and the first resonance capacitance 62 was charged beyond the voltage supplied by the rectifier unit 30 with an overvoltage. The counter voltage is applied to the first rectifier element 32 from the time t 1 backwards. The overvoltage starts at time t 1 as the second voltage U 2 at the second switching element 53.

Zu einem zweiten Zeitpunkt t2 wird, analog zu Anfangszeitpunkt t0, durch Setzen der zweiten Ansteuerkenngröße S2 auf den Schaltwert das zweite Schaltelement 53 in den Leitungszustand versetzt, nachdem durch Zurücksetzen der ersten Ansteuerkenngröße S1 auf Null das erste Schaltelement 52 in den Trennzustand versetzt wurde. Ein Kehrwert eines Doppelten der Zeitdifferenz t2- t0 entspricht der Frequenz, mit der die Heizfrequenzeinheit 50 betrieben wird. Die erste Resonanzkapazität 62 entlädt sich daraufhin über das zweite Schaltelement 53, die Induktionsheizeinheit 20 und das zweite Gleichrichterelement 34. Weiterhin lädt gleichgerichteter Strom vom zweiten Ausgangskontakt 57 über das zweite Schaltelement 53, die Induktionsheizeinheit 20 und das zweite Gleichrichterelement 34 die zweite Resonanzkapazität 64. Die Induktionsheizeinheit 20 verzögert zunächst einen Anstieg des zweiten Stroms I2. Über dem zweiten Schaltelement 53 liegt eine Spannung von nahezu 0V an. Über dem ersten Schaltelement 52, die im Trennzustand ist, fällt entsprechend eine von der Gleichrichtereinheit 30 gelieferte Spannung ab. Der Leistungsstrom IL entspricht einem negativen des zweiten Stroms I2.At a second time t 2 , analogously to the starting time t 0 , by setting the second control characteristic S 2 to the switching value, the second switching element 53 is placed in the line state, after resetting the first control characteristic S 1 to zero, the first switching element 52 in the disconnected state was shifted. A reciprocal of twice the time difference t 2 -t 0 corresponds to the frequency with which the heating frequency unit 50 is operated. The first resonance capacitance 62 then discharges via the second switching element 53, the induction heating unit 20 and the second rectifier element 34. Furthermore, rectified current from the second output contact 57 via the second switching element 53, the induction heating unit 20 and the second rectifier element 34 charges the second resonance capacitance 64 Induction heating unit 20 initially delays an increase of the second current I 2 . Above the second switching element 53 is a voltage of almost 0V. Above the first switching element 52, which is in the disconnected state, correspondingly a voltage supplied by the rectifier unit 30 drops. The power current I L corresponds to a negative of the second current I 2 .

Zu einem dritten Zeitpunkt t3 kommt, analog zu Zeitpunkt t1, der Leistungsstrom IL durch die Induktionsheizeinheit 20 zum Erliegen. Zuvor wurde durch Selbstinduktion der Induktionsheizeinheit 20 die erste Resonanzkapazität 62 teilweise mit einer Gegenspannung geladen und die zweite Resonanzkapazität 64 über die Spannung hinaus, die von der Gleichrichtereinheit 30 geliefert wird, mit einer Überspannung geladen. Die Gegenspannung fällt ab dem Zeitpunkt t3 rückwärtig an dem zweiten Gleichrichterelement 34 an. Die Überspannung fällt ab dem Zeitpunkt t3 als erste Spannung U1 an dem ersten Schaltelement 52 an.At a third time t 3 , analogous to time t 1 , the power current I L comes to a stop by the induction heating unit 20. Previously, by self-induction of the induction heating unit 20, the first resonance capacitance 62 was partially charged with a reverse voltage and the second resonance capacitance 64 was charged across the voltage also supplied from the rectifier unit 30 is charged with an overvoltage. The counter voltage is applied to the second rectifier element 34 from time t 3 onwards. The overvoltage starts at time t 3 as the first voltage U 1 at the first switching element 52.

Zu einem vierten Zeitpunkt t4 beginnt ein neuer Zyklus wie ab dem Anfangszeitpunkt t0. Ein Kehrwert der Differenz t4 - t0 entspricht der Frequenz, mit der die Heizfrequenzeinheit 50 angesteuert wird. Durch Veränderung der Frequenz, mit der die Heizfrequenzeinheit 50 betrieben wird, wird ein Abstand t2 - t1 bzw. t4 - t3, in dem keine Leistung umgesetz wird, verändert. So kann die Leistung der Induktionsheizeinheit 20 in linearer Abhängigkeit von der Frequenz verändert werden, solange die Frequenz kleiner ist als die Resonanzfrequenz, wobei eine Verringerung der Frequenz einer Verringerung der Leistung entspricht. Dies wird durch die Steuereinheit 16 und Stromsensoren (nicht näher dargestellt) sichergestellt. Da die Ströme I1, I2, IL zu den Zeitpunkten t0, t2, t4 Null sind, werden Schaltverluste in den Schaltelementen 52, 53 vermieden.At a fourth time t 4 , a new cycle begins as from the start time t 0 . A reciprocal of the difference t 4 - t 0 corresponds to the frequency with which the heating frequency unit 50 is driven. By changing the frequency with which the heating frequency unit 50 is operated, a distance t 2 - t 1 or t 4 - t 3 , in which no power is converted, changed. Thus, the power of the induction heating unit 20 can be changed in linear dependence on the frequency as long as the frequency is smaller than the resonance frequency, with a reduction in the frequency corresponding to a reduction in power. This is ensured by the control unit 16 and current sensors (not shown in detail). Since the currents I 1 , I 2 , I L are zero at the times t 0 , t 2 , t 4 , switching losses in the switching elements 52, 53 are avoided.

In einem Betriebszustand, in dem an dem ersten Eingangskontakt 42 der Gleichrichtereinheit 30 eine negative Spannung anliegt, wird wie oben beschrieben, eine Versorgung der Induktionsheizeinheit 20 durchgeführt, wobei das dritte Gleichrichterelement 36 die Rolle des ersten Gleichrichterelements 32 übernimmt, das vierte Gleichrichterelement 38 die Rolle des zweiten Gleichrichterelements 34 übernimmt und die Resonanzkapazitäten 62, 64 ihre Rollen tauschen. Bezugszeichen 10 Hausgerät 61 gemeinsamer Kontakt 12 Induktionsheizvorrichtung 62 Resonanzkapazität 14 Leistungselektronikeinheit 63 Außenkontakt 16 Steuereinheit 64 Resonanzkapazität 18 Elektroenergiequelle 65 Außenkontakt 20 Induktionsheizeinheit I1 Strom 22 Induktionsheizeinheit I2 Strom 24 Induktionsheizeinheit IL Leistungsstrom 26 Induktionsheizeinheit S1 Ansteuerkenngröße 30 Gleichrichtereinheit S2 Ansteuerkenngröße 32 Gleichrichterelement U1 Spannung 34 Gleichrichterelement U2 Spannung 36 Gleichrichterelement t Zeit 38 Gleichrichterelement t0 Anfangszeitpunkt 40 Pufferkapazität t1 Zeitpunkt 42 Eingangskontakt t2 Zeitpunkt 44 Eingangskontakt t3 Zeitpunkt 50 Heizfrequenzeinheit t4 Zeitpunkt 51 gemeinsamer Kontakt 52 Schaltelement 53 Schaltelement 54 Steuerkontakt 55 Steuerkontakt 56 Ausgangskontakt 57 Ausgangskontakt 60 Resonanzeinheit In an operating state in which a negative voltage is applied to the first input contact 42 of the rectifier unit 30, as described above, a supply of the induction heating unit 20 is performed, wherein the third rectifier element 36 takes over the role of the first rectifier element 32, the fourth rectifier element 38, the role of the second rectifier element 34 and the resonance capacitances 62, 64 exchange their roles. reference numeral 10 household appliance 61 common contact 12 induction heating 62 resonant capacitance 14 Power electronics unit 63 outside Contact 16 control unit 64 resonant capacitance 18 Electric power source 65 outside Contact 20 induction heating I 1 electricity 22 induction heating I 2 electricity 24 induction heating I L power current 26 induction heating S 1 Ansteuerkenngröße 30 Rectifier unit S 2 Ansteuerkenngröße 32 Rectifier element U 1 tension 34 Rectifier element U 2 tension 36 Rectifier element t Time 38 Rectifier element t 0 Start time 40 buffering capacity t 1 time 42 input contact t 2 time 44 input contact t 3 time 50 Heizfrequenzeinheit t 4 time 51 common contact 52 switching element 53 switching element 54 control contact 55 control contact 56 output contact 57 output contact 60 resonance unit

Claims (10)

  1. Induction heating device, in particular induction hob device, having at least one rectifier unit (30), which is provided to rectify current from an electrical energy source (18), wherein the rectifier unit (30) has at least one rapidly recovering rectifier element (32, 34, 36, 38), which has a reverse recovery time of at most 100 ns, wherein the rectifier element (32, 34, 36, 38) is a diode, characterised in that, in at least one operating mode, a maximum of one rectifier element (32, 34, 36, 38) of the rectifier unit (30) is simultaneously conducting.
  2. Induction heating device according to one of the preceding claims, characterised by at least one heat frequency unit (50), which is provided, in at least one operating state, to obtain energy via the rectifier unit (30) and to supply at least one induction heating unit (20, 22, 24, 26) with a high-frequency alternating current.
  3. Induction heating device according to one of the preceding claims, characterised by at least one resonance unit (60), which is provided to form at least one resonance pitch circle with an induction heating unit (20, 22, 24, 26) and which is directly connected to the electrical energy source (18) in at least one operating state.
  4. Induction heating device according to one of the preceding claims, characterised by at least one induction heating unit (20, 22, 24, 26) which is connected in an at least half-bridge manner.
  5. Induction heating device, at least according to claim 2, characterised by at least one resonance unit (60), which has at least one external contact (63, 65), which is electrically conductive in at least one direction with at least one switching element (52, 53) of the heat frequency unit (50) by way of at least one rectifier element (32, 34, 36, 38).
  6. Induction heating device according to claim 5, characterised in that the rectifier element (32, 34, 36, 38) is a rectifier element (32, 34, 36, 38) of the rectifier unit (30).
  7. Induction heating device according to one of the preceding claims, characterised by at least one buffer capacity (40), which, in at least one operating state, is directly connected to the electrical energy source (18).
  8. Induction heating device at least as claimed in claim 2, characterised by at least one control unit (16), which is provided to operate the heat frequency unit (50) in at least one operating mode with a frequency which is lower than a resonance frequency which is provided by an induction heating unit (20, 22, 24, 26) and a resonance unit (60).
  9. Domestic appliance, in particular cooking device, having at least one induction heating device (12) according to one of the preceding claims.
  10. Method for operating an induction heating device (12) according to one of claims 1 to 8, having at least one rectifier unit (30), wherein current from an electrical energy source (18) is rectified by the rectifier unit (30), wherein the rectifier unit (30) has at least one rapidly recovering rectifier element (32, 34, 36, 38), which has a reverse recovery time of at most 100 ns, wherein the rectifier element (32, 34, 36, 38) is a diode, characterised in that, in at least one operating mode, a maximum of one rectifier element (32, 34, 36, 38) of the rectifier unit (3 0) is simultaneously conducting.
EP13160666.7A 2012-04-02 2013-03-22 Induction heating device Active EP2648476B1 (en)

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Publication number Priority date Publication date Assignee Title
DE102015221068A1 (en) * 2015-10-28 2017-05-04 BSH Hausgeräte GmbH Hausgeräteheizvorrichtung

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3898410A (en) * 1972-06-16 1975-08-05 Environment One Corp AC to RF converter circuit for induction cooking unit

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3814888A (en) * 1971-11-19 1974-06-04 Gen Electric Solid state induction cooking appliance
DE4224405A1 (en) * 1992-03-14 1993-09-16 Ego Elektro Blanc & Fischer INDUCTIVE COOKING HEATING
EP2405710B1 (en) * 2002-06-26 2015-05-06 Mitsui Engineering and Shipbuilding Co, Ltd. Induction heating method and unit
KR20090057495A (en) * 2007-12-03 2009-06-08 삼성전자주식회사 Induction heating cooker and control method therof
FR2954661A1 (en) * 2009-12-23 2011-06-24 Jaeger INDUCERS ON BALANCED PHASES

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3898410A (en) * 1972-06-16 1975-08-05 Environment One Corp AC to RF converter circuit for induction cooking unit

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