EP2830391A1 - Dispositif de chauffage à induction - Google Patents

Dispositif de chauffage à induction Download PDF

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Publication number
EP2830391A1
EP2830391A1 EP14177217.8A EP14177217A EP2830391A1 EP 2830391 A1 EP2830391 A1 EP 2830391A1 EP 14177217 A EP14177217 A EP 14177217A EP 2830391 A1 EP2830391 A1 EP 2830391A1
Authority
EP
European Patent Office
Prior art keywords
switching element
switching
power
power supply
energy buffer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP14177217.8A
Other languages
German (de)
English (en)
Inventor
Daniel Anton Falcon
Nicolas Blasco Rueda
Carlos CALVO MESTRE
Sergio Llorente Gil
Diego Puyal Puente
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BSH Hausgeraete GmbH
Original Assignee
BSH Bosch und Siemens Hausgeraete GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BSH Bosch und Siemens Hausgeraete GmbH filed Critical BSH Bosch und Siemens Hausgeraete GmbH
Publication of EP2830391A1 publication Critical patent/EP2830391A1/fr
Withdrawn legal-status Critical Current

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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.
  • driver circuits comprise a switching energy buffer which is charged by an auxiliary voltage circuit via a second power switching element before the operation of a switching operation of the power switching element.
  • the object of the invention is in particular to provide a generic device with improved properties in terms of increased comfort and / or improved switching behavior.
  • 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 hob induction heating device, with at least one first power switching element, which is intended to switch a main power supply, and with at least one first drive circuit which is provided to activate and / or deactivate the first power switching element and having at least one switching energy buffer.
  • the induction heating device has at least one first charging circuit with at least one switching element which is provided to connect the switching energy buffer in at least a first operating state to the main energy supply in order to charge the switching energy buffer.
  • a "power switching element” is to be understood in particular as a switching element which is intended to have an average current of at least 0.5 A, in particular at least 1 A, advantageously at least 4 A, preferably at least 10 A, in particular periodically, in at least one operating mode turn.
  • the power switching element is adapted to the average current over a period of more than 10 seconds, in particular more than 1 minute, advantageously more than 10 minutes, preferably defect-free to wear.
  • the power switching element is designed as a semiconductor component, in particular as a transistor, advantageously as an IGBT, alternatively as a MOSFET, and / or as a transistor group.
  • the power switching element is intended to switch at a frequency of at least 1 kHz, in particular at least 10 kHz, advantageously at least 50 kHz.
  • a "switching element" is to be understood in particular as a component which is provided to produce and / or to separate at least one electrically conductive connection between at least two power contacts as a function of a signal, in particular an electrical signal applied to switching contacts.
  • a "main energy supply” is to be understood in particular as a circuit which is intended to provide a power of at least 100 W, in particular at least 500 W, advantageously at least 1000 W, preferably at least 2000 W.
  • the main energy supply is intended to be connected on the input side to at least one phase of a power supply network or another energy source.
  • the main energy supply on the output side has a voltage, preferably one, in particular pulsating, DC voltage of at least 100 V, in particular at least 200 V.
  • the main energy supply has at least one buffer capacity on the output side.
  • the main energy supply has on the input side at least one rectifier unit and / or at least one filter unit.
  • the power switching element is intended to "switch a main energy supply” is to be understood in particular to mean that the power switching element is intended to connect at least one power component, in particular at least one inductor, to the main power supply.
  • the power switching element is intended to switch a current of the inductor, which is intended to receive in the operating mode a power of at least 100 W, in particular at least 500 W, advantageously at least 1000 W, preferably at least 2000 W, from the main power supply .
  • An “inductor” is to be understood in particular as a wound electrical conductor, preferably in the form of a circular disk through which high-frequency alternating current flows in at least one operating state.
  • the inductor is preferably provided to convert electrical energy into a magnetic alternating field, which is provided in a metallic, preferably at least partially ferromagnetic, heating means, in particular a cooking utensils, eddy currents and / or Cause magnetization effects, which are converted into heat.
  • a "driver circuit” should be understood in particular a circuit which is intended to occupy switching contacts of the power switching element, in particular in response to signals of a control unit with different signals, in particular short circuit the switching contacts or apply a voltage and / or current.
  • the driver circuit is provided to act as a safety member between the controller and the main power supply.
  • a “switching energy buffer” should be understood in particular to mean a unit which is provided to store energy for generating the different signals for occupying the switching contacts of the power switching element.
  • the switching energy buffer is formed by at least one electrical capacitance, in particular at least one capacitor.
  • the charging circuit has at least one limiting resistor, which is intended to limit a current flowing into the switching energy buffer.
  • the charging circuit has at least one voltage limiting unit, which is provided to limit a voltage drop across the switching energy buffer. Including that a switching element is provided to "connect” a component "to the main power supply,” should be understood in particular that the switching element in at least one operating state closes a circuit, so that a current flow from the main power supply through the component is possible.
  • the induction heating device has a control unit which is provided to control a switching operation of the power switching element by signals to the driver circuit and to connect the switching energy buffer via the switching element with the main power supply before the start of the switching operation.
  • the control unit preferably comprises a computing unit and, in particular in addition to the computing unit, a memory unit with a control and / or regulating program stored therein, which is intended to be executed by the computing unit.
  • the control unit has control outputs which are connected to control inputs of at least one driver circuit.
  • a “switching operation" of the power switching element should in particular be understood as an operating mode in which the power switching element is operated, preferably at least sectionally periodically, in particular at a frequency of at least 10 kHz, in particular at least 10 kHz.
  • the control unit connects the switching energy buffer for a maximum of 1 s, advantageously at most 0.3 s, preferably at most 0.1 s, preferably at most 0.03 s, before the start of the switching operation with the main energy supply.
  • switching inputs of the switching element are connected to switching outputs of the control unit.
  • a good switching behavior can be achieved.
  • an asymmetrical voltage profile can be at least substantially avoided.
  • the induction heating device has at least one second charging circuit, which is provided to charge the switching energy buffer during a switching operation of the power switching element by means of a control power supply.
  • a "control energy supply” is to be understood, in particular, as a circuit which has a lower power carrying capacity and / or different voltage than the main energy supply.
  • a voltage of the "control energy supply” has, in particular by a factor of at least 10, lower ripple and / or voltage than the main energy supply.
  • the control power supply is connected to the main power supply.
  • the control power supply to it is provided to be separately connected to at least one phase of a power supply network to better control the main power supply can.
  • the main power supply and the control power supply have a common contact.
  • a slight influence, in particular a slight asymmetry, of a current through the power switching element, in particular a current through the inductor can be achieved, in particular if the switching energy buffer is charged during a switching operation.
  • the induction heating device has a control unit which is provided to keep a connection of the switching energy buffer with the main energy supply by means of the switching element separated during a switching operation of the power switching element.
  • a slight influence, in particular a slight asymmetry, of a current through the power switching element, in particular of a current through the inductor can be achieved.
  • the switching element is designed as an electronic switch, in particular as an opto-relay, a semiconductor relay, bipolar or field-effect transistor.
  • An “opto-relay” is to be understood in particular as a switching element which carries out a potential separation between the switching contacts and the power contacts by means of at least one optocoupler.
  • An “optocoupler” is to be understood in particular as a unit which is intended to convert an electrical signal, in particular by means of LEDs, into an optical signal, in particular visible light or infrared, and the optical signal, in turn, in particular by means of a photodiode to convert an electrical signal.
  • a high durability can be achieved.
  • a secure control can be achieved.
  • the power switching element and the further power switching element differently sized stabilizing resistors are connected in parallel.
  • the stabilizing resistor connected in parallel with the first power switching element is greater than the stabilizing resistor connected in parallel with the further power switching element.
  • a combined resistance of the stabilizing resistor connected in parallel with the first power switching element and of the charging circuit at least substantially corresponds to the resistance of the stabilizing resistor connected in parallel to the further power switching element.
  • a first and a second resonant capacitance different sized stabilizing resistors are connected in parallel.
  • the Resonanazkapaztician en connect a first contact of the inductor in each case with different poles of the main energy supply.
  • stabilizing resistors of different sizes are parallel to the first power switching element and the second resonant capacitance or the second power switching element and the first resonant capacitance connected.
  • a stabilizing resistor would be connected in parallel to the first power switching element and a further stabilizing resistor of the second resonant capacitance.
  • a stabilizing resistor would be connected in parallel with the second power switching element and a further stabilizing resistor of the first resonant capacitance.
  • the control unit be provided to start the switching operation when voltages dropping across the stabilizing resistors are at least substantially equal.
  • the induction heating apparatus includes voltmeters which measure voltages across the power switching elements and the control unit is arranged to evaluate them to determine a starting point for the switching operation.
  • the control unit is provided after a predetermined time, which is calculated and / or stored in particular, to disconnect the connection of the switching energy buffer with the main power supply and to start the switching operation.
  • a high level of comfort in particular by avoiding switch-on noise, can be achieved.
  • FIG. 1 shows a designed as an induction hob home appliance 10 with inductors 12 which are arranged under a hob plate 11.
  • the household appliance 10 has induction heating devices 20 designed as cooktop induction heaters ( FIG. 2 ).
  • the induction heater 20 includes a first power switching element 22 and another power switching element 24 each provided to switch a main power supply 14.
  • the power switching elements 22, 24 are part of a half-bridge circuit, in whose bridge branch one of the inductors 12 is arranged.
  • the power switching elements 22, 24 are each formed by an IGBT, to which a free-wheeling diode and a snubber capacitor are connected in parallel.
  • the half-bridge circuit has two resonance capacitances 26, 27 which connect a first contact of the inductor 12 to different poles of the main power supply 14, respectively.
  • a second contact of the inductor 12 can be connected via the two power switching elements 22, 24 in each case with different poles of the main power supply 14.
  • the second contact of the inductor 12 is connected to a respective power contact of the power switching elements 22, 24, wherein further power contacts of the power switching elements 22, 24 are each connected to different poles of the main power supply 14.
  • the induction heating device 20 has a first driver circuit 30, which is provided to activate and deactivate the first power switching element 22 and which has a switching energy buffer 32 designed as bootstrap capacity.
  • the induction heating device 20 has a second drive circuit 31, which is provided to activate and deactivate the further power switching element 24.
  • the induction heating device 20 has a control unit 16, which is provided to control a switching operation of the power switching elements 22, 24 by signals to the respective drive circuits 30, 31.
  • the control unit 16 is intended to activate the power switching elements 22, 24 alternately in a switching operation, wherein between an activation period of one of the power switching elements 22, 24 and a subsequent further activation period of another of the power switching elements 22, 24 may be a break in both the power switching elements 22, 24 are inactive, so lock a connection.
  • the driver circuits 30, 31 are each provided to activate the power switching elements 22, 24 by applying a voltage between switching contacts of the power switching elements 22, 24 and to disable the power switching elements 22, 24 by shorting the switching contacts of the power switching elements 22, 24.
  • the switching energy buffer 32 serves to provide a voltage necessary for switching, even when separated by the further power switching element 24 compound.
  • One of the switching contacts of the power switching elements 22, 24 respectively forms a common contact with one of the power contacts of the power switching elements 22, 24.
  • the common contact of the further power switching element 24 is directly connected to a pole of the main power supply 14.
  • the common contact of the first power switching element 22 is directly connected to the further power contact of the further power switching element 24.
  • the induction heating device 20 has a first charging circuit 40 with a switching element 42 which is provided to connect the switching energy buffer 32 before the start of the switching operation, the switching energy buffer 32 via the switching element 42 to the main power supply 14 to load the switching energy buffer 32.
  • the first charging circuit 40 further includes a current limiting resistor 44 connected in series with the switching element 42.
  • the first charging circuit 40 has a diode 46 to define a current flow direction, which is also connected in series with the switching element 42.
  • a first contact of the charging circuit 40 is directly connected to a pole of the main power supply 14, to which the first power switching element 22 is directly connected.
  • a second contact of the charging circuit 40 is connected to a first contact of the switching energy buffer 32.
  • a second contact of the switching energy buffer 32 is connected to the common contact of the first power switching element 22.
  • the switching energy buffer 32 has a capacitance and a parallel-connected Zener diode which limits a voltage of the capacitance of the switching energy buffer 32.
  • the switching element 42 is formed by an opto-relay. The switching element 42 has a dielectric strength of 600 V.
  • switching element as an isolated, non-isolated, bipolar, bidirectional and / or unidirectional transistor or as an electromechanical switch, in particular as a classic relay, conceivable.
  • the power switching element 22 and the further power switching element 24 different sized stabilizing resistors 23, 25 are connected in parallel.
  • the first power switching element 22 is connected in parallel with a stabilizing resistor 23 of 750 k ⁇ .
  • the further power switching element 24 has a stabilizing resistor 25 of 100 k ⁇ connected in parallel.
  • a current which charges the switching energy buffer 32 flows through the first charging circuit 40, the switching energy buffer 32, the inductor 12 and the resonance capacitor 27. Furthermore, a current which charges the switching energy buffer 32 flows from the main power supply 14 via the first charging circuit 40, the switching energy buffer 32, and the stabilizing resistor 25 connected in parallel to the further power switching element 24. Further, a current flows from the resonance capacitor 26 via the first charging circuit 40, the switching energy buffer 32 and the inductor 12, a current that charges the switching energy buffer 32 by equalizing currents between the unequally charged by the different sized stabilizing resistors 23, 25 resonant capacitances 26, 27. Due to the flowing currents, a voltage of the resonance capacitances 26, 27 and / or across the power switching elements 22, 24 are balanced against each other
  • the control unit 16 is intended to start the switching operation when voltages dropping across the stabilizing resistors 23, 25 are at least substantially equal. This time can be determined either by measuring the voltages or by calculations.
  • the switching element 42 is deactivated by the control unit 16.
  • the connection of the switching energy buffer 32 to the main power supply 14 by means of the switching element 42 is kept continuously separated during the switching operation of the power switching elements 22, 24.
  • control unit 16 is provided to reconnect the switching energy buffer for charge refreshment in more or less regular intervals with the main power supply, which can be dispensed in particular to a second charging circuit.
  • the induction heating device 20 has a second charging circuit 50, which is provided to charge the switching energy buffer 32 during the switching operation of the power switching elements 22, 24 by means of a control power supply 52.
  • the control power supply 52 provides the second drive circuit 31 with a voltage necessary for switching the further power switching element 24.
  • the control power supply 52 provides a voltage of 24 V, although other voltages between 2 V and 50 V are conceivable.
  • a breakdown voltage of the zener diode of the switching energy buffer 32 corresponds at least substantially to one Voltage of the control power supply 52 and / or is minimally larger.
  • the second charging circuit 50 has a current limiting resistor 54 which limits a current taken from the control power supply 52.
  • the second charging circuit 50 has a diode 56, which avoids a flow of current from the main power supply 14 to the control power supply 52 in the case of an active switching element 42.
  • the diode 56 of the second charging circuit 50 has a withstand voltage of 600V.
  • a first contact of the second charging circuit 50 is connected to a first pole of the control power supply 52.
  • a second contact of the second charging circuit 50 is connected to the first contact of the switching energy buffer 32 or connected directly thereto.
  • a second pole of the control power supply 52 is directly connected to one pole of the main power supply 14 and forms a common ground.
  • the control unit 16 starts a switching operation of the power switching elements 22, 24 at high, for example, maximum frequency and then lowers the frequency to a frequency at which a requested heating power is output via the inductor 12.
  • the driver circuits 30, 31 each have a switching unit 33, 34 which apply either a voltage of the switching energy buffer 32 or the control power supply 52 to switching contacts of the power switching elements 22, 24 or short circuit a connection between the respective switching contacts.
  • the switching units 33, 34 have switching elements designed as opto-relays.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Induction Heating Cooking Devices (AREA)
EP14177217.8A 2013-07-26 2014-07-16 Dispositif de chauffage à induction Withdrawn EP2830391A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ES201331148 2013-07-26

Publications (1)

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EP2830391A1 true EP2830391A1 (fr) 2015-01-28

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EP14177217.8A Withdrawn EP2830391A1 (fr) 2013-07-26 2014-07-16 Dispositif de chauffage à induction

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005078914A (ja) * 2003-08-29 2005-03-24 Fuji Electric Fa Components & Systems Co Ltd 誘導加熱装置
JP2012209055A (ja) * 2011-03-29 2012-10-25 Kyocera Document Solutions Inc 誘導加熱装置、定着装置、及び画像形成装置
EP2753147A2 (fr) * 2013-01-02 2014-07-09 LG Electronics Inc. Appareil de cuisson à induction

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005078914A (ja) * 2003-08-29 2005-03-24 Fuji Electric Fa Components & Systems Co Ltd 誘導加熱装置
JP2012209055A (ja) * 2011-03-29 2012-10-25 Kyocera Document Solutions Inc 誘導加熱装置、定着装置、及び画像形成装置
EP2753147A2 (fr) * 2013-01-02 2014-07-09 LG Electronics Inc. Appareil de cuisson à induction

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