WO2023052061A1 - Dispositif de cuisson à induction - Google Patents

Dispositif de cuisson à induction Download PDF

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Publication number
WO2023052061A1
WO2023052061A1 PCT/EP2022/074821 EP2022074821W WO2023052061A1 WO 2023052061 A1 WO2023052061 A1 WO 2023052061A1 EP 2022074821 W EP2022074821 W EP 2022074821W WO 2023052061 A1 WO2023052061 A1 WO 2023052061A1
Authority
WO
WIPO (PCT)
Prior art keywords
induction coil
induction
switching element
coil
circuit board
Prior art date
Application number
PCT/EP2022/074821
Other languages
German (de)
English (en)
Inventor
Ignacio Lope Moratilla
Jorge DURO NARVIÓN
Claudio Carretero Chamarro
Izaskun JACA EQUIZA
Jorge Felices Betran
Javier SERRANO TRULLEN
Original Assignee
BSH Hausgeräte 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 Hausgeräte GmbH filed Critical BSH Hausgeräte GmbH
Publication of WO2023052061A1 publication Critical patent/WO2023052061A1/fr

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/12—Cooking devices
    • H05B6/1209—Cooking devices induction cooking plates or the like and devices to be used in combination with them
    • H05B6/1245—Cooking devices induction cooking plates or the like and devices to be used in combination with them with special coil arrangements
    • 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
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/022—Heaters specially adapted for heating gaseous material

Definitions

  • the invention relates to an induction cooking device according to the preamble of claim 1.
  • Induction cooktops are known from the prior art which have a plurality of induction coils arranged concentrically to one another.
  • the induction coils are each arranged in a circuit with inverter electronics and operated by them.
  • the object of the invention consists in particular, but not limited thereto, in providing a generic device with improved properties with regard to a small number of required components.
  • the object is achieved according to the invention by the features of claim 1, while advantageous refinements and developments of the invention can be found in the dependent claims.
  • the invention is based on an induction cooking appliance device, in particular an induction hob device, with at least one first induction heating unit, which has a first induction coil, and at least one electronic inverter which is provided for the purpose, at least in a first operating state, of the first induction coil in a primary circuit with a clock frequency, in particular to operate in a range between 1 kHz and 150 kHz, for example in a range between 20 kHz and 120 kHz, preferably in a range between 30 kHz and 100 kHz, in particular to heat up a cookware.
  • the induction heating unit has a secondary circuit with a second induction coil that is free of inverter electronics, the secondary circuit being closed at least in the first operating state, so that the second induction coil draws energy inductively from the first induction coil.
  • the second induction coil is provided for the purpose of inductively delivering and/or passing on energy drawn from the first induction coil to the cooking utensil.
  • An “induction cooking device device”, in particular an “induction hob device”, should be understood to mean in particular at least a part, in particular a subassembly, of an induction cooking device, in particular an induction hob.
  • an “induction cooking appliance” should be understood to mean, in particular, a cooking appliance, in particular a household appliance provided for heating, heating and/or cooking food, such as food.
  • the induction cooking appliance is intended to warm up, heat and/or cook the food to be cooked by means of at least one inductively heated heating element.
  • an induction hob device has at least one hob plate for setting up cookware, such as cooking pots, pans and/or the like.
  • the induction cooking appliance device is designed, for example, as an induction oven device and has at least one, in particular plate-shaped, induction heating element, which is provided in particular for heating an oven interior.
  • an “induction coil” of an induction heating unit is to be understood in particular as an electrical coil which is intended to, in at least one operating state, at least a large part, in particular at least 30%, advantageously at least 50%, for example at least 70%, preferably at least 90%, of an in the electrical power introduced by the induction coil, of in particular at least 500 W, in particular at least 500 W, for example at least 1000 W, to an induction heating element, which is designed in particular as cooking utensil, alternatively, for example, as a heating plate.
  • the induction coil is intended to heat the induction heating element by means of eddy current induction and/or magnetic reversal effects, such as domain flips.
  • the induction coil is preferably designed as a flat coil.
  • the induction coil is formed by a spirally wound electrical line, in particular a stranded line.
  • the induction coil is wound along a surface, in particular a flat surface, alternatively a curved surface.
  • the inverter electronics are provided in particular to convert an input signal, in particular a DC voltage or a rectified and in particular smoothed AC voltage, into an AC voltage signal.
  • the inverter electronics have at least one switching unit, which is formed in particular by at least one switching element, preferably at least two switching elements, in particular semiconductor switching elements, preferably bipolar transistors with an insulated gate electrode (IGBT).
  • the switching unit is intended to alternately connect different contacts of the input signal to a contact of the first induction coil.
  • the inverter electronics together with the first induction coil form a forced resonant circuit.
  • the switching unit in particular the switching elements of the switching unit, is intended to be switched, in particular activated and/or deactivated, at the clock frequency.
  • the secondary circuit is "free" of inverter electronics is to be understood, for example, as meaning that in a closed state, i.e. in particular at least in a state that is conductive for AC voltage, it is free of electronic components, in particular switching elements, which are intended to generate a forced to cause electrical oscillation in the second induction coil, so that a frequency of the electrical oscillation correlates with a frequency of the switching operations.
  • the second induction coil is not conductively connected to any inverter electronics in any operating state.
  • the secondary circuit is intended to be supplied and/or operated solely by means of inductive energy transmission, in particular from the primary circuit.
  • the secondary circuit is in particular a closed series connection of electrical components.
  • the first induction coil is intended to pass on at least 30%, in particular at least 50%, of the energy fed into the first induction coil to the second induction coil in at least one operating mode, although other proportions are also conceivable.
  • the second induction coil advantageously has a smaller line cross-section than the first induction coil in order to save material and/or costs, for example.
  • a line cross section of the second induction coil is at most 50%, in particular at most 30% of a line cross section of the first induction coil.
  • the secondary circuit is formed only by the second induction coil, which is short-circuited.
  • Provided should be understood to mean, in particular, specially programmed, designed and/or equipped.
  • the fact that an object is provided for a specific function is to be understood in particular to mean that the object fulfills and/or executes this specific function in at least one application and/or operating state.
  • a redistribution of electrical energy that is provided to the first induction coil can be achieved by such a configuration.
  • the second induction coil is preferably arranged so that it overlaps the first induction coil.
  • overlap should be understood to mean that their coverage areas overlap and/or intersect at least in projection, in particular vertical projection, onto a reference surface, in particular reference plane.
  • the second induction coil overlaps at least 50%, in particular at least 80%, preferably at least 95% of the first induction coil.
  • the covering area of an induction coil is formed in particular by an area that is spanned between an innermost turn of the induction coil and an outermost turn of the induction coil.
  • the reference surface or reference plane is in particular a surface or plane which is parallel, or at least essentially parallel, to the windings of at least one of the two induction coils.
  • the reference surface is formed by a hob plate, in particular a surface thereof, or by a wall of an oven.
  • Relative statements made below about the induction coils, in particular with regard to positions, arrangement and/or sizes, can each be read as valid for the coverage areas and in projection onto the reference plane.
  • electrical leads to the induction coils are excluded from the geometric considerations.
  • the first and second induction coils are arranged at a distance of less than 5 cm, in particular less than 3 cm, advantageously less than 1 cm, preferably less than 0.5 cm, in particular at least in a direction perpendicular to the reference surface.
  • the first induction coil and the second induction coil are arranged parallel to one another.
  • the induction cooking device has a switching element which is intended to close the secondary circuit in the first operating mode and/or to keep it closed and which is intended to, in at least a second operating state in which the first Induction coil is operated in a primary circuit with a clock frequency in a range between 1 kHz and 150 kHz to open the secondary circuit and / or keep it open, so that a current flow through the second induction coil is prevented or substantially prevented.
  • the flow of current in the second induction coil is suppressed to such an extent that a maximum of 1%, in particular a maximum of 0.1%, preferably a maximum of 0.01% of a power fed into the first induction coil is transmitted to the second induction coil.
  • the switching element is provided for short-circuiting the second induction coil.
  • increased flexibility can be achieved by such a configuration.
  • the second induction coil can be switched on if required, in particular in order to enlarge a heating area.
  • the secondary circuit is formed only by the second induction coil and the switching element.
  • the switching element is preferably provided to close the secondary circuit in the first operating state for an uninterrupted period of time that is greater than a multiple, in particular at least four times, for example at least ten times, preferably at least a hundred times, a period corresponding to the clock frequency.
  • a multiple in particular at least four times, for example at least ten times, preferably at least a hundred times, a period corresponding to the clock frequency.
  • slower and cheaper switching elements can be used in this way.
  • the second induction coil is arranged concentrically to the first induction coil. In this way, in particular, good inductive coupling can be achieved.
  • the second induction coil advantageously has at least one outer region which is arranged radially outside of the first induction coil.
  • the outer area forms an annular area, in particular a circular ring-shaped area, which surrounds the first induction coil.
  • the outer area is concentric to first induction coil arranged. In this way, an enlargement of a heating area can advantageously be achieved.
  • the outer area in particular at least one center and/or focal point of the outer area, is arranged laterally offset to the first induction coil.
  • the outer area differs from an area surrounding the first induction coil.
  • the second induction coil has at least one overlapping area that corresponds to a coverage area of the complete first induction coil.
  • the overlapping area and the covering area of the first induction coil are congruent.
  • the overlap area and the outer area are disjoint.
  • the outer area is spaced apart from the overlapping area, in particular at least in the radial direction, in particular parallel to the hob plate and/or to the reference surface, in particular by at least 0.5 mm, for example by at least 1 cm, in particular by at least 2 cm.
  • good inductive coupling can be achieved.
  • the overlapping area is smaller than a covering area of the first induction coil.
  • the first induction coil and the second induction coil have the same number of turns and/or winding density, at least in the overlapping area, in particular the same number of turns per distance unit in a radial extension, in particular viewed from a center and/or a central axis of the induction coil.
  • the turn densities of the first induction coil and the second induction coil differ in the overlapping area, in particular by a maximum of 20%, preferably a maximum of 5%.
  • the second induction coil has a higher winding density in the outer area than in the overlapping area.
  • a winding density in the outer area is preferably equal to a winding density in the overlapping area.
  • the first induction coil in the coverage area and the second induction coil at least in the Overlap area are each formed as different groups of wires of a common stranded wire. In this way, in particular, good inductive coupling can be achieved.
  • the induction cooking appliance device can have a common carrier on which the first induction coil and the second induction coil are arranged.
  • the carrier can be made of a plastic or a ceramic material, for example.
  • the induction coils are connected to the carrier, in particular by means of a form fit, force fit and/or material bond.
  • the first induction coil and the second induction coil can be arranged and/or attached to different carriers.
  • the carriers are connected to one another.
  • the first induction coil and the second induction coil are arranged on the same side of the common carrier.
  • good inductive coupling can be achieved.
  • first induction coil and the second induction coil are arranged on different sides of the common carrier.
  • simple production can be achieved.
  • the induction cooking appliance device can have a carrier, in particular the common carrier, the carrier having a groove in which the first induction coil and/or the second induction coil is guided.
  • the first induction coil and the second induction coil are guided together in the groove, in particular at least in the overlapping area.
  • the carrier has a second groove, the first induction coil being guided in the groove and the second induction coil being guided in the second groove.
  • at least the groove, in particular also the second groove is formed in a spiral shape in the carrier. In particular, a secure hold can be achieved.
  • the second induction coil can be arranged between the first induction coil and an induction heater to be heated, in particular cookware.
  • the second induction coil is arranged between the first induction coil and the hob plate. In this way, in particular, a high level of efficiency can be achieved.
  • the second induction coil has at least a first section and a second section, the second induction coil having a different winding direction in the second section than in the first section.
  • the induction coil is formed by an electrical line which has a first winding sense in the first section and a second winding sense, in particular opposite the first winding sense, in the second section.
  • the electrical line is wound in the first area, in particular starting from a first, in particular inner, end of the electrical line, clockwise or counterclockwise, in particular in projection onto the reference surface.
  • the direction of the winding changes in one area and/or at one point of the electrical line between the first area and the second area, in particular following a course of the electrical line from a clockwise winding to a counterclockwise winding or from a counterclockwise winding clockwise into a clockwise winding.
  • an improved distribution of energy in the induction heating element, in particular cookware can be achieved.
  • areas, in particular rings, of low heating power density between areas of high heating power density can be avoided in this way.
  • the outer region is advantageously formed at least essentially, in particular at least 90%, preferably completely, by the second section of the second induction coil.
  • the second section is preferably formed at least essentially, in particular at least 90%, preferably completely, by the outer area.
  • the overlapping area is advantageously formed at least essentially, in particular at least 90%, preferably completely, by the first section of the second induction coil.
  • the first section is preferably formed at least essentially, in particular at least 90%, preferably completely, by the overlapping area.
  • the induction cooking appliance device has at least a first printed circuit board, on which the inverter electronics are arranged, and a second printed circuit board, which is designed separately from the first printed circuit board and on which at least the switching element is arranged that is provided for to close the secondary circuit in the first operating mode and/or to keep it closed and which is intended to, in at least a second operating state, in which the first induction coil is operated in a primary circuit with a clock frequency in a range between 1 kHz and 150 kHz, to open the secondary circuit and / or to keep it open, so that a current flow through the second induction coil is at least substantially prevented.
  • increased modularity and/or flexibility during production can be achieved.
  • the same printed circuit boards can be achieved.
  • the switching element of the secondary circuit is arranged on the same printed circuit board as the rectifier electronics of the primary circuit.
  • the induction cooking appliance device can have at least one plug connector, which is arranged on the first printed circuit board.
  • the connector is intended to be connected to at least one connecting line that is connected to the second circuit board.
  • the plug connector is preferably designed as an angled plug connector, so that in particular an inserted cable is led away from the first printed circuit board in parallel or essentially in parallel.
  • the connector is arranged in an edge area of the first printed circuit board.
  • the plug connector is arranged remotely from the edge of the first circuit board.
  • the plug connector is designed as a straight plug connector, so that an inserted cable is routed away from the first printed circuit board perpendicularly or substantially perpendicularly to the first printed circuit board.
  • the switching element is advantageously designed as a mechanical switching element, in particular as a relay.
  • a high current-carrying capacity and/or a high electrical efficiency can be achieved due to low ohmic losses.
  • a reliable separation can be achieved in the second operating mode. Costs can also be reduced as a result.
  • the switching element is designed as a semiconductor switching element.
  • the switching element can be used as an opening switching element, which is intended in particular to change from a closed state to an open state by applying a switching current, or preferably as a closing switching element, which is intended in particular to change from the open state to the open state by applying the switching current to switch closed state, be trained.
  • the induction cooking appliance device has a driver circuit which is arranged on the first printed circuit board and which is intended to provide a switching current for the switching element.
  • a simple configuration can be achieved.
  • a switching current is to be understood in particular as a current which is intended to flow directly through at least one switching contact of the switching element and which is high enough to switch the switching element from a blocking state to a conducting state.
  • the driver circuit is arranged on the second printed circuit board.
  • the induction cooking device has a first control unit.
  • the first control unit is preferably arranged on the first printed circuit board.
  • the first control unit is provided to provide the second printed circuit board, in particular the driver circuit or directly to the switching element, with a control signal as a function of which the switching element is to be switched.
  • the first control unit is preferably an electronic control unit.
  • the first control unit has, in particular, a processor and a memory, an operating program which is intended to be executed by the processor preferably being stored in the memory.
  • the first Control unit can also be designed as an application-specific integrated circuit (ASIC).
  • ASIC application-specific integrated circuit
  • the induction cooking appliance device can have a second control unit, which is arranged on the second printed circuit board and which is provided at least to switch the switching element.
  • the first control unit and the second control unit are connected to one another by means of a data bus connection, with the control signal being provided via the data bus connection.
  • the second control unit is preferably designed as an application-specific integrated circuit.
  • the driver circuit is integrated into the second control unit.
  • the first control unit and the second control unit can be connected to one another via a direct data connection.
  • the second printed circuit board in particular the second control unit, has an identifier component, in particular a jumper, which can be set/configured in particular during assembly.
  • the second control unit can communicate a value of the identifier component by means of the data bus connection.
  • a value of the identifier component indicates which induction coil or which induction heating unit the second printed circuit board is associated with, in particular if the induction cooking device has a plurality of induction heating units.
  • a configuration of the induction cooking device and in particular an assignment of the second printed circuit board to an induction heating unit can be stored in the first control unit, in particular an operating program of the first control unit.
  • the secondary circuit has a resonant capacitance in at least one operating state, which is connected in series with the switching element and the second induction coil.
  • the resonant capacitance has at least one electrical capacitor, for example.
  • the resonant capacitance can have further switching elements, which are intended to connect further electrical capacitors in series or in series with the electrical capacitor to switch in parallel. At least one of the further switching elements can be provided for short-circuiting the resonant capacitance.
  • the secondary circuit draws more energy from the primary circuit for specific frequency ranges, in particular frequency ranges close to a resulting resonant frequency of the secondary circuit, and thus for specific power ranges, than for other frequency ranges.
  • the secondary circuit is formed only by the second induction coil, the switching element and the resonant capacitance.
  • the resonant capacitance is advantageously arranged on the second printed circuit board.
  • the induction cooking appliance device has measuring electronics which are intended to measure electrical properties, in particular current and/or voltage, of at least one component of the secondary circuit.
  • the measurement electronics are preferably arranged on the second printed circuit board.
  • the second control unit is intended to transmit measurement values from the measurement electronics to the first control unit via the data connection and/or data bus connection.
  • the measurement electronics are connected directly to the first control unit.
  • the secondary circuit is only formed by the second induction coil, the switching element of the resonant capacitance and/or the measuring electronics.
  • an induction cooking appliance in particular an induction hob, is proposed with at least one induction cooking appliance device as described above.
  • a method for operating an induction cooking device as described above wherein in a first operating state a switching element closes the secondary circuit and/or keeps it closed, so that the second induction coil can draw energy from the first induction coil, and in a second operating state the switching element closes the secondary circuit interrupted and / or keeps interrupted, so that a current flow through the second induction coil is at least substantially prevented.
  • operation of the first induction coil is advantageously interrupted by the inverter electronics, in particular in order to avoid voltage peaks in the secondary circuit, in particular across the switching element.
  • a switchover time of the switching element is selected such that it lies between two zero crossings of a supply voltage, the operation of the inverter electronics being interrupted from a first of the two zero crossings to a second of the two zero crossings.
  • the induction cooking device should not be limited to the application and embodiment described above.
  • the induction cooking appliance device can have a number of individual elements, components and units that differs from the number specified here in order to fulfill a function described herein.
  • Fig. 1 an induction cooking device designed as an induction hob in a schematic plan view
  • FIGS. 4 a) and b) a first operating state and a second operating state of the induction hob device in a schematic representation
  • 5 shows a configuration of a first induction coil and a second induction coil on a common carrier in a schematic perspective sectional view
  • 6 shows a configuration of a first induction coil and a second induction coil on a common carrier in a schematic perspective sectional view
  • FIG. 7 shows a configuration of a first induction coil and a second induction coil on separate carriers in a schematic perspective sectional view
  • FIG. 8 shows a configuration of a first induction coil and a second induction coil on a common carrier in a schematic perspective sectional view
  • FIG. 9 shows a configuration of a first induction coil and a second induction coil on a common carrier in a schematic perspective sectional view
  • FIG. 10 shows a configuration of a first induction coil and a second induction coil on a common carrier in a schematic perspective sectional view
  • FIG. 11 shows a configuration of a first induction coil and a second induction coil as wire groups of a common stranded line in a schematic sectional view
  • FIG. 12 shows a configuration of a first induction coil and a second induction coil in a schematic plan view
  • FIG. 13 shows a configuration of a first induction coil and a second induction coil in a schematic plan view
  • FIG. 14 shows a configuration of a first induction coil and a second induction coil in a schematic plan view
  • FIG. 16 shows the configuration from FIG. 15 in a schematic plan view
  • 19 shows a printed circuit board configuration with a common printed circuit board in a schematic representation
  • 20 shows a printed circuit board configuration with a first printed circuit board and a second printed circuit board in a schematic representation
  • FIG. 21 shows a printed circuit board configuration with a first printed circuit board and a second printed circuit board in a schematic representation
  • FIG. 22 shows a printed circuit board configuration with a first printed circuit board and a second printed circuit board in a schematic representation
  • 26 shows a printed circuit board configuration with a first printed circuit board and a second printed circuit board in a schematic representation
  • FIG. 27 shows a time course diagram for a switch-on process of a switching element of the induction cooking appliance device
  • FIG. 28 shows a time course diagram for a switching-off process of a switching element of the induction cooking appliance device.
  • FIG. 1 shows an induction cooking appliance 11 with an induction cooking appliance 10.
  • the induction cooking appliance 11 is designed as an induction hob.
  • the induction cooking appliance device 10 is designed as an induction hob device.
  • the induction cooking appliance 11 has a plurality of heating zones (here four). The heating zones are designed as cooking zones.
  • the induction cooking device 10 is assigned to one of the heating zones.
  • the induction cooking device 10 has an induction heating unit 16 .
  • the induction heating unit 16 has a first induction coil 18 and a second induction coil 20 .
  • the induction cooking appliance 11, in particular the induction cooking appliance device 10, also has a hob plate
  • the heating zones are formed on a surface of the cooktop panel 12 .
  • the hob plate 12 forms an upper boundary of the induction cooking device 11.
  • the hob plate 12 is provided for setting up cookware 13 (see FIG. 2).
  • the induction heating unit 16 is intended to heat a cooking utensil 13 that is placed/placed in the heating zone that is assigned to the induction heating unit 16 .
  • the induction heating unit 16 has a first induction coil 18 . Furthermore, the induction cooking appliance device 10 has inverter electronics 14 which are provided to operate the first induction coil 18 in a primary circuit at a clock frequency, at least in a first operating state (cf. FIG. 4b).
  • the clock frequency is in a range between 30 kHz and 100 kHz.
  • the clock frequency is selected, set and/or regulated in such a way that the cooking utensil 13 is supplied with a predetermined power. In the first operating mode, the cookware
  • the primary circuit has the first induction coil 18 .
  • the primary circuit also has the inverter electronics 14 .
  • the primary circuit can also have an electrical capacitance.
  • the primary circuit also has a power supply.
  • the induction cooking appliance device 10, in particular the induction heating unit 16, has a secondary circuit with a second induction coil 20.
  • the induction cooking appliance device 10, in particular the induction heating unit 16, has a switching element 22.
  • the switching element 22 is arranged in the secondary circuit.
  • the secondary circuit is free of inverter electronics.
  • the secondary circuit is closed at least in the first operating state. This is in the first operating state Switching element 22 closed. In the first operating mode, the second induction coil 18 draws energy from the first induction coil 18 inductively.
  • the switching element 22 is provided to close the secondary circuit in the first operating mode and/or to keep it closed.
  • the switching element 22 is intended to open and/or keep the secondary circuit open in at least a second operating state (cf. FIG. 4a), so that a current flow through the second induction coil 20 is prevented.
  • the first induction coil 18 in the primary circuit is operated with a clock frequency in a range between 1 kHz and 150 kHz.
  • energy is only supplied inductively to the cooking utensil 13 by the first induction coil 18 .
  • the switching element 22 is intended to close the secondary circuit over an uninterrupted period of time in the first operating state, which is greater than a multiple of a period corresponding to the clock frequency.
  • the second induction coil 20 is arranged to overlap the first induction coil 18 .
  • the second induction coil 20 is arranged concentrically to the first induction coil 18 .
  • the first induction coil 18 is ring-shaped, in particular a circular ring-shaped.
  • the first induction coil 18 is designed as a flat coil.
  • the first induction coil 18 consists of turns spiraling along a single plane.
  • the plane is parallel to the hob plate 12.
  • the second induction coil 20 is ring-shaped, in particular a circular ring-shaped.
  • the second induction coil 20 is designed as a flat coil.
  • the second induction coil 20 consists of turns spiraling along a single plane.
  • the plane is parallel to the hob plate 12.
  • the second induction coil 20 has a larger outer diameter than the first induction coil 18.
  • the second induction coil 20 has the same inner diameter as the first induction coil 18.
  • the second induction coil 20 has an outer region that is arranged radially outside of the first induction coil 18 .
  • the outer area is concentric with the first induction coil 18.
  • the outer area is concentric with the second induction coil 20.
  • the second induction coil 20 has an overlap area that corresponds to a coverage area of the complete first induction coil 18 .
  • the induction cooking appliance device in particular the induction heating unit 16, has a common support 19.
  • the first induction coil 18 and at least the overlapping area of the second induction coil 20 are arranged on the common support 19 (cf. FIG. 5).
  • the first induction coil 18 and the second induction coil 20 are arranged on different sides of the common carrier 19 .
  • the common carrier 19 has a groove on an upper side, in which the first induction coil 18 is guided.
  • the common carrier 19 has a groove on an underside, in which the second induction coil 20 is guided.
  • the first induction coil 18 and the second induction coil 20 are arranged on different sides of the common carrier 19 .
  • the common carrier 19 has a groove on an upper side, in which the first induction coil 18 is guided.
  • the common carrier 19 has a groove on an underside, in which the second induction coil 20 is guided.
  • the carrier 18 may be arranged on an underside of the carrier 19, while the second induction coil 20 is arranged on an upper side of the carrier 19.
  • the upper side faces the hob plate 12
  • the underside of the hob plate 12 faces away.
  • the outer portion of the second induction coil 20 can be mounted on the common carrier
  • the outer area of the second induction coil 20 can be arranged on a separate carrier.
  • the turns of the second induction coil 20 in the outer area can lie in the same plane as the turns of the overlapping area.
  • the turns of the second induction coil 20 in the outer region can lie in a different plane, in particular in a plane in which the turns of the first induction coil 18 lie.
  • the second induction coil 20 has a smaller cable cross section than the first induction coil 18.
  • a winding density of the second induction coil 20 in the overlapping area is greater than a winding density of the first induction coil 18, since a web between adjacent tracks of the respective groove was chosen to be the same for the groove on the top and the groove on the bottom, one line of the second induction coil 20, however, has a smaller line cross-section than a line of the first induction coil 18.
  • a wider web is used for the groove on the side of the second induction coil between adjacent tracks of the groove chosen as for the groove of the first induction coil so that the leads of the coils are parallel.
  • the grooves can each have a depth that corresponds to a thickness of the electrical line of the respective induction coil. Alternatively, the depth can be larger or smaller than a thickness of the respective electrical line.
  • the first induction coil 18s and the second induction coil 20s are arranged on the same side, in particular an upper side, of the common carrier 19s.
  • Windings of the first induction coil 18s and the second induction coil 20s alternate on the carrier 19s. All turns, in particular except for an innermost turn and an outermost turn, of the second induction coil 20s lie between two turns of the first induction coil 18s. All turns, in particular except for an innermost turn and an outermost turn, of the first induction coil 18s lie between two turns of the second induction coil 20s.
  • the windings of the first induction coil 18s are each close to/without a spacing from the windings of the second induction coil 20s.
  • the common support 19s is formed as a thin plate.
  • the common support 19s has an inner ring protruding upward.
  • the induction coils 18s, 20s are wound from the ring.
  • the induction cooking appliance device 10a in particular the induction heating unit 16a, has a first carrier 19a and a second carrier 21a.
  • the first induction coil 18a is arranged on the first support 19a.
  • the second induction coil 20a is arranged on the second carrier 21a.
  • the first carrier 19a can be glued to the second carrier 21a.
  • the carriers 19a, 21a each have a groove on an upper side, in which the respective induction coil 18a, 20a is guided.
  • the first induction coil 18a is sandwiched between the first support 19a and the second support 21a.
  • the second induction coil is enclosed at least in the overlap area between the first carrier and the second carrier.
  • At least the overlapping area of the second induction coil 20 is arranged between the first induction coil 18 and a cooking utensil 13 to be heated.
  • the second induction coil 20 is arranged closer to the hob plate 12 than the first induction coil 18.
  • the first induction coil 18b and the second induction coil 20b are in turn arranged on the same side of the common carrier 19b.
  • the common carrier 19b has a single groove in which both the first induction coil 18b and the second induction coil 20b are guided.
  • the second induction coil 20b can be arranged on an inside of the groove, while the first induction coil 18b is guided on an outside of the groove.
  • the first induction coil 18b and the second induction coil 20b are close together and/or adjacent to each other in the groove.
  • the first induction coil 18c and the second induction coil 20c are arranged on the same side of the common carrier 19c.
  • the common carrier 19c has two grooves that extend parallel to each other in a spiral from a center of the common carrier 19c, so that, apart from the innermost and outermost tracks of the grooves, between two adjacent tracks of the grooves there is exactly one track of the other groove lies.
  • the first induction coil 18c is routed in one of the grooves, while the second induction coil 20c is routed in another of the grooves.
  • the common carrier 19d has a corrugated or rectangular profile, which forms a groove on both sides of the common carrier 19d.
  • the first induction coil 18d is located in one of the grooves while the second induction coil 20d is located in another of the grooves.
  • the windings of the first induction coil 18d and the windings of the second induction coil 20d are in this case arranged in a common plane.
  • FIG. 11 shows a further alternative embodiment.
  • the first induction coil 18e and the second induction coil 20e are each formed in the overlapping area as different groups of wires of a common stranded line.
  • some of the wires are provided with a different colored lacquer than the rest of the wires, so that when the induction coils 18e, 20e are wound, the correct wires can be combined into groups around the first induction coil 18e and the second induction coil to form 20e.
  • FIG. 12 shows an embodiment in which the second induction coil 20f has an oval or rectangular shape, for example for a roasting zone.
  • the first induction coil 18f has a circular shape.
  • a narrow side of the second induction coil 20f has an extension that corresponds to a diameter of the first induction coil 18f.
  • the second induction coil 20f completely overlaps the first induction coil 18f.
  • the second induction coil 20f and the first induction coil 18f are arranged concentrically.
  • the second induction coil 20g has an overlapping area that is congruent with a covering area of the first induction coil 18g. Furthermore, the second induction coil 20g has an outer area. The outer area is arranged laterally next to the first induction coil 18g and the second induction coil 20g.
  • FIG. 14 shows a further embodiment of the induction heating unit 16h.
  • the second induction coil 20h has an inner area.
  • the inner area covers an area not covered by the first induction coil 18h.
  • the second induction coil 20h has an overlapping area that overlaps with the first induction coil 18h.
  • the overlapping area surrounds the inner area in a ring shape. In this case, the overlapping area can be smaller than a coverage area of the first induction coil 18h.
  • Such an embodiment can facilitate the detection of small cooking utensils.
  • such a configuration can allow efficient heating of small cooking utensils by transferring power from the first induction coil to the second induction coil and thus making it available to the interior.
  • FIGS. 15 and 16 show a further embodiment of the induction heating unit 16i.
  • the second induction coil 20i has a first section and a second section.
  • the second induction coil 20i has a first winding direction 26i in the first region.
  • the second induction coil 20i has a second winding sense 27i in the second area.
  • the second induction coil 20i has a different winding direction 26i, 27i in the second section than in the first section.
  • the second area surrounds the first area annularly.
  • the winding sense 26i in the first section is opposite to the winding sense 27i in the second section.
  • the second induction coil 20i has an outer region which is arranged radially outside of the first induction coil 18i. The outer area is formed by the second section of the second induction coil 20i.
  • the second induction coil 20i has an overlap area that corresponds to a coverage area of the complete first induction coil 18i.
  • the first induction coil 18i has a winding direction 25i.
  • the winding sense 25i of the first induction coil 18i corresponds to a winding sense 26i of the first region of the second induction coil 20i.
  • a sense of winding of the first induction coil corresponds to a sense of winding of the second region of the second induction coil.
  • the overlapping area is formed by the first section of the second induction coil 20i.
  • the first area and the second area of the second induction coil 20i can be arranged on a common carrier.
  • the carrier can have a groove that defines a respective direction of winding.
  • FIG. 17 shows heat output distributions 30, 34, 36 for different configurations and/or operating modes in relation to an arrangement of the induction heating unit 16.
  • a first heating power distribution 30 shows a course of the heating power density in the radial direction for the second operating mode, in which the first induction coil 18 is actively operated and the switching element 22 is open, so that a current flow through the second induction coil 20 is prevented.
  • the first heat output distribution 30 increases from a center of the first induction coil 18 outwards, has a maximum and decreases further outwards. Outside the coverage area of the first induction coil 18, the heating power density is low.
  • a second heating power distribution 34 shows a course of the heating power density in the radial direction for the first operating mode, in which the first induction coil 18 is actively operated and the switching element 22 is closed, so that the second induction coil 20 can draw energy from the first induction coil 18, with this the second induction coil 20 has a different winding direction in the overlapping area than in the outer area.
  • the second heat output distribution 34 increases from a center of the second induction coil 20 outwards, has a maximum and decreases again toward the edge of the second induction coil 20 .
  • a third heating power distribution 36 shows a profile of the heating power density in the radial direction for the first operating mode, with a winding sense of the second induction coil 20 being constant.
  • the third heating power distribution 36 has two local maxima.
  • the heating power density increases from a center of the first and second induction coils 18, 20 outwards and reaches a local maximum within the overlapping area. After the local maximum has been reached, the heating power density decreases again towards the outside until a local minimum is reached at an outer edge of the first induction coil 18 . After the local minimum has been reached, the heating power density increases again towards the outside, reaches a local maximum in the outer area of the second induction coil 20 and then decreases. Outside the second induction coil 20, the heating power density is low.
  • FIG. 18 shows an embodiment of an induction cooking device 10k.
  • the induction cooking appliance device 10k shows a first printed circuit board 40k.
  • the printed circuit board 40k In comparison to a printed circuit board for an induction heating unit without a second induction coil, the printed circuit board 40k has a lateral extension which is formed in one piece with the first printed circuit board 40k. A layout of the first printed circuit board changes here only in the area of the lateral expansion in comparison to an embodiment without a second induction coil.
  • the switching element 22k is arranged in the lateral extension.
  • the switching element 22k is designed as a relay.
  • the induction cooking appliance device 10k also has a driver circuit 52k, which is arranged in the lateral expansion and which is intended to provide the switching element 22k with a switching current.
  • FIG. 19 shows an alternative embodiment of an induction cooking device 101.
  • the switching element 221 is arranged on the first printed circuit board 401.
  • a driver circuit 521 is also arranged on the first circuit board 401 .
  • the first circuit board 401 is larger than a comparable circuit board for an induction heating unit without a second induction coil.
  • FIG. 20 shows a further embodiment of an induction cooking appliance device 10m.
  • the induction cooking appliance device 10m has a first printed circuit board 40m.
  • the inverter electronics 14m are arranged on the first printed circuit board 40m.
  • the induction cooking appliance device 10m also has a second printed circuit board 50m.
  • the second circuit board 50m is separate from the first circuit board 40m.
  • the switching element 22m is arranged on the second circuit board 50m.
  • the switching element 22m is provided to close the secondary circuit in the first operating mode and/or to keep it closed.
  • the switching element 22m is also provided to open and/or keep the secondary circuit open in the second operating state, so that a current flow through the second induction coil 20m is prevented.
  • the induction cooking appliance device 10m has a plug connector 42m.
  • the connector 42m is arranged on the first circuit board 40m.
  • the connector 42m is intended to be connected to at least one connection line that is connected to the second printed circuit board 50m.
  • the plug connector 42m is arranged at a distance from an edge of the first printed circuit board 40m.
  • the connecting line provides the second printed circuit board 50m with a supply voltage.
  • FIG. 21 shows a further embodiment of an induction cooking appliance device 10n.
  • the connector 42n is designed as an angled connector.
  • the connector 42n is arranged in an edge area of the first printed circuit board 40n.
  • FIG. 22 shows an alternative embodiment of an induction cooking device 10o.
  • the switching element 22o is arranged on the second circuit board 50o.
  • the induction cooking appliance device 10o has a driver circuit 52o, which is arranged on the first printed circuit board 40o and which is intended to provide a switching current for the switching element 22o. In this case, the switching current is transmitted via the connecting line from the first printed circuit board 40o to the second printed circuit board 50o.
  • FIG. 23 shows a further embodiment of an induction cooking appliance device 10p.
  • the induction cooking appliance device 10p has a first control unit (not shown), which is arranged on the first printed circuit board 40p and which is intended to provide the second printed circuit board 50p with a control signal, depending on which the Switching element is to be switched 22p.
  • the control signal is routed to the second printed circuit board 50p via the connecting line.
  • the induction cooking appliance device 10p has a second control unit 54p, which is arranged on the second printed circuit board 50p.
  • the second control unit 54p is provided to switch the switching element 22p.
  • the first control unit and the second control unit 54p are connected to one another by means of a data bus connection.
  • the control signal is provided via the data bus connection.
  • the data bus connection is made via the connecting line.
  • the connecting line can have a separate line for the data bus connection, or the data bus connection can be modulated onto a line for the voltage supply.
  • the control unit 54p activates or deactivates the driver circuit 52p (cf. FIG. 24).
  • the driver circuit 52p then provides (activate) a switching current to the switching element 22p or interrupts a switching current (deactivate).
  • the switching element 22p is in this case designed as a closing switching element.
  • the induction cooking appliance device 10p can have test electronics 56p, which are provided to check a switching state of the switching element 22p and to provide the second control unit 54p with a corresponding test value.
  • the second control unit 54p can be provided to determine faulty switching behavior based on the test value.
  • the second control unit 54p can be provided to report a faulty switching behavior to the first printed circuit board 40p, in particular the first control unit, and/or to control the driver circuit 52p differently.
  • the induction cooking appliance device 10a, 10q, 10r in particular the secondary circuit, has a resonant capacitance 24a, 24q, 24r.
  • the resonant capacitance 24a, 24q, 24r is arranged in the secondary circuit.
  • the resonant capacitance 24a, 24q, 24r is connected in series with the switching element 22a, 22q, 22r and the second induction coil 20a, 20q, 20r.
  • the resonant capacitance 24q, 24r is arranged on the second circuit board 50q, 50r.
  • the switching element 22 is controlled in a first operating state such that it closes the secondary circuit and/or keeps it closed, so that the second induction coil 20 can obtain energy from the first induction coil 18 .
  • the switching element 22 is controlled in such a way that it interrupts the secondary circuit and/or keeps it interrupted, so that a current flow through the second induction coil 20 is prevented.
  • FIGS. 27 and 28 a switch-on process and a switch-off process are shown schematically in a time flow chart.
  • a rectified supply voltage 60 has zero crossings, here zeros, at regular intervals.
  • the level of a current 72 flowing through the first induction coil 18 adapts to a profile of the supply voltage 60 as long as the inverter electronics 14 are active.
  • the switching element 22 is in an open state 66 (cf. FIG. 27). If the switching element 22 is to be switched over, operation of the inverter electronics 14 is interrupted for an interruption period 74, preferably for a half cycle of the supply voltage (or a full cycle of the rectified supply voltage 60) between two zero crossings of the rectified supply voltage 60.
  • a drive signal 64 for the switching element 22 is activated during the interruption period 74 .
  • the switching element is placed in a transitional state 68 by activation of the driver signal 64 .
  • the switching element 22 changes from the open state 66 to a closed state 70.
  • the switching element 22 is in the closed state 70, so that the second induction coil 20 is energized when the operation of the inverter electronics 14 is resumed can be supplied.
  • the switching element 22 Before the second induction coil 20 is deactivated, the switching element 22 is in a closed state 70 (cf. FIG. 27). If the switching element 22 is to be switched over, the inverter electronics 14 are operated for an interruption period 74, preferably for a half cycle of the supply voltage (or a full cycle of the rectified supply voltage 60) between two zero crossings of the rectified supply voltage 60. During this interruption period 74, the first induction coil is virtually free of current. A driver signal 64 for the switching element 22 is deactivated during the interruption period 74 .
  • the switching element 22 Deactivation of the driver signal 64, the switching element 22 is placed in a transitional state 68. In the transitional state 68, the switching element 22 changes from the closed state 70 to the open state 66. At the latest by the end of the interruption period 74, the switching element 22 is in the open state 66, so that the second induction coil 20 is de-energized when the operation of the inverter electronics 14 is resumed .

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Induction Heating (AREA)

Abstract

L'invention concerne un appareil de cuisson à induction, en particulier un dispositif de cuisson à induction, comprenant : au moins une première unité de chauffage par induction (16) qui comporte une première bobine d'induction (18) ; et au moins un système électronique d'onduleur (14) qui est conçu pour fonctionner, au moins dans un premier état de fonctionnement, la première bobine d'induction (18) dans un circuit primaire à fréquence d'horloge, en particulier dans une plage comprise entre 1 kHz et 150 kHz, en particulier pour chauffer un ustensile de cuisson (13). Afin d'obtenir une flexibilité accrue, selon l'invention, l'unité de chauffage par induction (16) comprend un circuit secondaire comprenant une seconde bobine d'induction (20) qui n'a pas de système électronique d'onduleur, le circuit secondaire étant fermé au moins dans le premier état de fonctionnement de telle sorte que la seconde bobine d'induction (20) aspire par induction de l'énergie à partir de la première bobine d'induction (18).
PCT/EP2022/074821 2021-09-29 2022-09-07 Dispositif de cuisson à induction WO2023052061A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP21382880.9 2021-09-29
EP21382880 2021-09-29

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WO2023052061A1 true WO2023052061A1 (fr) 2023-04-06

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4334135A (en) * 1980-12-22 1982-06-08 General Electric Company Utensil location sensor for induction surface units
DE19546853A1 (de) * 1995-12-15 1997-06-19 Aeg Hausgeraete Gmbh Markierung für eine induktionsbeheizte Kochstelle
EP1317164A2 (fr) * 2001-11-30 2003-06-04 E.G.O. ELEKTRO-GERÄTEBAU GmbH Dispositif de marquage d'une bobine à induction par illumination
WO2012028985A1 (fr) * 2010-08-31 2012-03-08 BSH Bosch und Siemens Hausgeräte GmbH Corps chauffant par induction
EP2592899A2 (fr) * 2011-11-14 2013-05-15 BSH Bosch und Siemens Hausgeräte GmbH Dispositif d'appareil ménager

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4334135A (en) * 1980-12-22 1982-06-08 General Electric Company Utensil location sensor for induction surface units
DE19546853A1 (de) * 1995-12-15 1997-06-19 Aeg Hausgeraete Gmbh Markierung für eine induktionsbeheizte Kochstelle
EP1317164A2 (fr) * 2001-11-30 2003-06-04 E.G.O. ELEKTRO-GERÄTEBAU GmbH Dispositif de marquage d'une bobine à induction par illumination
WO2012028985A1 (fr) * 2010-08-31 2012-03-08 BSH Bosch und Siemens Hausgeräte GmbH Corps chauffant par induction
EP2592899A2 (fr) * 2011-11-14 2013-05-15 BSH Bosch und Siemens Hausgeräte GmbH Dispositif d'appareil ménager

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