EP2506667B2 - Dispositif de chauffage à induction - Google Patents

Dispositif de chauffage à induction Download PDF

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Publication number
EP2506667B2
EP2506667B2 EP12158709.1A EP12158709A EP2506667B2 EP 2506667 B2 EP2506667 B2 EP 2506667B2 EP 12158709 A EP12158709 A EP 12158709A EP 2506667 B2 EP2506667 B2 EP 2506667B2
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EP
European Patent Office
Prior art keywords
induction heating
unit
induction
units
heating units
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EP12158709.1A
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German (de)
English (en)
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EP2506667A3 (fr
EP2506667B1 (fr
EP2506667A2 (fr
Inventor
Miguel Angel BUÑUEL MAGDALENA
Carmelo Pina Gadea
Diego Puyal Puente
Julio Rivera Peman
Jose-Ramon Garcia Jimenez
Jose Andres Garcia Martinez
Ignacio Garde Aranda
Pablo Jesus Hernandez Blasco
Sergio Llorente Gil
Alfonso Lorente Perez
David Ortiz Sainz
Ramon Peinado Adiego
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BSH Hausgeraete GmbH
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BSH Hausgeraete GmbH
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/06—Control, e.g. of temperature, of power
    • H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
    • H05B6/065—Control, e.g. of temperature, of power for cooking plates or the like using coordinated control of multiple induction coils

Definitions

  • the invention is based on an induction heating device according to the preamble of claim 1.
  • Induction heating devices are known from the prior art, which have a large number of induction heating elements which are supplied in parallel by an inverter.
  • the object of the invention is, in particular, to provide a generic device with improved properties in terms of high flexibility.
  • the object is achieved according to the invention by the features of patent claim 1, while advantageous refinements and developments of the invention can be found in the subclaims.
  • the invention is based on an induction heating device, in particular an induction hob device, with at least one heating frequency unit and at least three induction heating units that are assigned to the heating frequency unit.
  • the induction heating device has at least one control unit, which is at least intended to operate at least two of the induction heating units in sections in an operating mode.
  • a “heating frequency unit” is to be understood in particular as an electrical unit which generates an oscillating electrical signal, preferably with a frequency of at least 1 kHz, in particular of at least 10 kHz, advantageously of at least 20 kHz, and in particular of a maximum of 100 kHz for an induction heating unit .
  • the heating frequency unit is intended to provide a maximum electrical power required by the induction heating unit of at least 1000 W, in particular at least 2000 W, advantageously at least 3000 W and preferably at least 3500 W.
  • the heating frequency unit in particular comprises at least one inverter, which preferably has at least two bidirectional unipolar switches, preferably connected in series, which are in particular formed by a transistor and a diode connected in parallel, and particularly advantageously at least one damping capacitance connected in parallel to the bidirectional unipolar switches, which is formed in particular by at least one capacitor.
  • This makes it possible to provide a high-frequency energy supply to the induction heating unit.
  • a voltage tap of the high-frequency unit is arranged in particular at a common contact point of two bidirectional unipolar switches.
  • An “induction heating unit” is intended to mean, in particular, a unit with at least one induction heating element.
  • induction heating element is to be understood in particular as a wound electrical conductor, preferably in the form of a circular disk, through which high-frequency alternating current flows in at least one operating state.
  • the induction heating element is preferably intended to convert electrical energy into an alternating magnetic field, which is intended to cause eddy currents and/or magnetic reversal effects in a metallic, preferably at least partially ferromagnetic, heating medium, in particular a cooking utensil, which are converted into heat.
  • an induction heating unit is "assigned" to a heating frequency unit should be understood in particular to mean that in every operating state in which the induction heating unit is supplied with high-frequency alternating current, the heating frequency unit is directly connected to the induction heating unit.
  • the induction heating device preferably has at least one switching arrangement with at least two switching elements, which differ from switching elements of a heating frequency unit, which is in particular intended to establish at least one direct connection from the heating frequency unit, preferably the voltage tap of the heating frequency unit, to at least one of the induction heating units.
  • a “direct connection” is to be understood in particular as an electrical connection which, at least in an operating state with a current flow of alternating current across the connection with a frequency between 1 kHz and 100 kHz, has an impedance that is smaller in magnitude than 10 V/A, in particular less than 1 V/A, preferably less than 0.1 V/A and the amount of which fluctuates by a maximum of 10%, preferably a maximum of 3%, in particular over a frequency range from 1 kHz to 100 kHz.
  • a “switching element” is intended to mean, in particular, an electrical component with at least two electrical contacts and at least two states.
  • a “contact” should be understood to mean, in particular, an electrical connection point of an electrical component.
  • a switching element preferably has a control element that can be controlled with low voltage, in particular a voltage between 12 V and 24 V, and causes a change in state of the switching element.
  • a switching element is designed as a relay, which is preferably designed as a single-pole or multi-pole on-switch or as a single-pole or multi-pole changeover switch.
  • control unit is to be understood in particular as an electronic unit which is preferably at least partially integrated in a control and/or regulating unit of the induction heating device and which is preferably intended to control and/or regulate at least the heating frequency unit and the switching arrangement.
  • control unit controls the control elements of the switching elements of the switching arrangement in order to establish at least one connection between the heating frequency unit and at least one of the induction heating units.
  • the control unit comprises a computing unit and in particular, in addition to the computing unit, a storage unit with a control and/or regulation program stored therein, which is intended to be executed by the computing unit.
  • an induction heating unit is operated “in sections” should be understood in particular to mean that the induction heating unit is active or inactive alternately, preferably periodically.
  • the fact that the induction heating unit is “active” should be understood in particular to mean that it is continuously supplied with high-frequency alternating current for a period of at least 10 ms.
  • the fact that the induction heating unit is "inactive” should be understood in particular to mean that it differs from an active induction heating unit and in particular less than 10 W, in particular less than 1 W and preferably less than 0.1 W, over a period of at least 10 ms absorbs electrical power.
  • An “operating section” is intended to mean, in particular, a time range in which the induction heating unit is active.
  • operating sections of one induction heating unit differ from operating sections of the other induction heating unit.
  • the fact that a first and a second operating section “differ” should be understood in particular to mean that a starting point of the second operating section lies behind an end point of the first operating section.
  • a flexible supply of the induction heating units can be achieved.
  • a “heating area” is intended to mean, in particular, an effective area of the alternating magnetic field generated by the induction heating unit in at least one operating state.
  • An “area of effect” is to be understood in particular as a region in which a magnetic flux density corresponds to at least 30%, in particular at least 45%, advantageously at least 60% and preferably at least 75% of a current maximum magnetic flux density of the alternating magnetic field.
  • a heating area is preferably an area which, in an operating state, is located directly above the induction heating unit on a hob plate.
  • two induction heating units form a "common" heating area
  • the heating areas of both induction heating units are spaced apart from one another in at least one area by a maximum of 2 cm, in particular a maximum of 1 cm, advantageously a maximum of 0.1 cm, and preferably partially overlap.
  • the at least two induction heating units are arranged concentrically.
  • the control unit is intended to operate the at least two induction heating units in identical operating sections in an operating mode. In particular, uniform heating of a large area can be achieved.
  • At least two of the induction heating units have a common contact.
  • a “common contact” is intended to mean, in particular, a contact point to which the induction heating units are directly connected in any operating state, which preferably differs from an operating state with a defect. In particular, costs can be reduced.
  • the induction heating unit has a resonance unit which is directly connected to the common contact 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 capacitance and/or a capacitance which is connected in parallel to a switching element.
  • a resonance capacitance is formed by a combination of series and parallel connections of several capacitors.
  • the resonance capacitance is in particular a component of an electrical resonant circuit, in particular an electrical series resonant circuit.
  • the resonance capacitance is connected in series with the induction heating unit in at least one operating state, in particular via a switching element, and is particularly advantageously intended to be charged via the induction heating unit by at least one heating frequency unit, in particular if the induction heating unit is raised to a higher electrical potential by the switching arrangement is placed.
  • the resonance capacitance is arranged in particular on a side of the induction heating unit facing away from the frequency unit, viewed in the direction of a conduction path.
  • an induction heating unit is operated in a full bridge circuit. In a full bridge circuit, the induction heating unit is arranged together with a resonance capacitance, preferably connected in series with the induction heating unit, between two voltage dividers formed by heating frequency units in the bridge branch.
  • An induction heating unit is preferably operated in a half-bridge circuit.
  • the induction heating unit is arranged between a voltage divider formed by the heating frequency unit and a voltage divider formed by two resonant capacitances in the bridge branch. In particular, costs can be reduced.
  • control unit is provided, in an operating mode with sectional operation of at least two induction heating units, to space starting points of two successive operating sections of any induction heating units by at least 50 ms, preferably at least 100 ms.
  • a distance between two starting points of directly successive operating sections of any induction heating units is a multiple of 50 ms or a multiple of 100 ms.
  • overloading of switching elements, in particular relays can be avoided.
  • control unit is provided for, in an operating mode with sectional operation of at least two induction heating units, successive starting points of at least two, in particular at least five, advantageously at least ten and preferably of all successive operating sections of an induction heating unit with a maximum of 7 s, in particular a maximum of 5 s a maximum of 3 s and preferably a maximum of 2 s.
  • a maximum of 7 s in particular a maximum of 5 s a maximum of 3 s and preferably a maximum of 2 s.
  • an increase in comfort can be achieved because heat is generated evenly over time.
  • the induction heating device has at least two switching elements which are arranged between the heating frequency unit and at least one of the induction heating units.
  • the switching elements are part of the switching arrangement and/or differ from switching elements of a heating frequency unit.
  • the switching elements are preferably designed as single-pole or multi-pole changeover switches.
  • the fact that the switching elements are arranged "between" the heating frequency unit and the induction heating unit should be understood in particular to mean that in an operating state in which the induction heating unit is supplied with high-frequency alternating current, the induction heating unit with the switching means in any order on a single contact, preferably a voltage tap, the heating frequency unit are arranged in series.
  • the first switching element is directly connected to the heating frequency unit, the second switching element to the first switching element and the induction heating unit to the second switching element.
  • a low switching frequency and thus low wear on the switching elements can be achieved.
  • FIG. 1 shows a household appliance 10a designed as an induction hob device with an induction heating device 12a designed as an induction hob device with five induction heating units 20a, 22a, 24a, 26a, 28a, each of which has an induction heating element designed as an inductor.
  • the induction heating units 20a, 22a, 24a, 26a, 28a are arranged under a hob plate 14a.
  • heating areas 30a, 32a, 34a, 36a, 38a designed as cooking zones are arranged directly above the induction heating units 20a, 22a, 24a, 26a, 28a.
  • the heating areas 36a, 38a of the induction heating units 26a, 28a are arranged concentrically and form a common heating area 39a.
  • the induction heating units 20a, 22a, 24a, 26a, 28a are intended to heat cooking utensils placed on the heating area 30a, 32a, 34a, 36a, 38a assigned to the induction heating unit 20a, 22a, 24a, 26a, 28a.
  • the induction heating device 12a has a power module 18a operated by a single phase 16a of a three-phase house connection, which is intended to supply the induction heating units 20a, 22a, 24a, 26a, 28a with high-frequency alternating current with a frequency between 20 kHz and 100 kHz to supply.
  • the power module 18a has a heating frequency unit 60a, to which the induction heating units 20a, 22a, 24a, 26a, 28a are assigned ( Fig. 2, 3 , 4, 5 ).
  • the frequency is dependent on a heating power requested for the heating area 30a, 32a, 34a, 36a, 38a via an operating unit 62a and a cooking utensil arranged on the heating area 30a, 32a, 34a, 36a, 38a and is determined by a control unit 64a of the induction heating device 12a .
  • the control unit 64a has a computing unit, a storage unit and an operating program stored in the storage unit, which is intended to be executed by the computing unit.
  • Figure 2 shows a first circuit for the induction heating device 12a, which is in an induction hob Figure 1 can be used.
  • a mains voltage between 220 V and 230 V with a mains frequency between 49 Hz and 51 Hz present on a phase 16a is rectified in a rectifier 66a and partially stored in a buffer capacity 68a.
  • the poles of the buffer capacitance 68a form two external contacts 70a, 72a between which a pulsating direct voltage is present.
  • the heating frequency unit 60a is arranged between the external contacts 70a, 72a and converts the pulsating direct voltage into a high-frequency alternating current.
  • the heating frequency unit 60a has two bidirectional unipolar switches connected in series between the external contacts 70a, 72a trained switching elements 74a, 76a, each with a parallel-connected damping capacitor 78a, 80a.
  • the switching elements 74a, 76a are each formed by an IGBT 82a, 84a (bipolar transistor with an insulated gate electrode) and a diode 86a, 88a connected in parallel.
  • a voltage tap 90a is arranged on a common contact of the two IGBTs 82a, 84a.
  • the control unit 64a By alternating, high-frequency control of the two IGBTs 82a, 84a at the voltage tap 90a, the control unit 64a causes a high-frequency alternating voltage, which is followed by a high-frequency alternating current when an induction heating unit 20a, 22a, 24a, 26a, 28a is connected.
  • the voltage tap 90a of the heating frequency unit 60a is connected to an input contact 96a of a switching arrangement 92a of the induction heating device 12a.
  • the switching arrangement 92a has five switching elements 40a, 42a, 44a, 46a, 48a, which are designed as relays designed as single-pole on-switches.
  • a first of two contacts of the switching elements 40a, 42a, 44a, 46a, 48a (the left contact in the illustration) is connected directly to the input contact 96a.
  • a second contact of the switching elements 40a, 42a, 44a, 46a, 48a is each connected to a first contact of one of the five induction heating units 20a, 22a, 24a, 26a, 28a.
  • the switching elements 40a, 42a, 44a, 46a, 48a are open in a normal state and are closed by control from the control unit 64a.
  • the control unit 64a is intended to connect induction heating units 20a, 22a, 24a, 26a, 28a directly to the heating frequency unit 60a by controlling the switching elements 40a, 42a, 44a, 46a, 48a.
  • Second contacts of the induction heating units 20a, 22a, 24a, 26a, 28a are directly connected to one another and form a common contact 94a.
  • a resonance unit 50a is directly connected to this common contact 94a and is formed by two resonance capacitances 52a, 54a of essentially the same size connected in series.
  • the resonance capacitances 52a, 54a are each formed by a single capacitor.
  • a first contact of the first resonance capacitance 52a is directly connected to the first external contact 70a and a first contact of the second resonance capacitance 54a is directly connected to the second external contact 72a.
  • the second contacts of the resonance capacitances 52a, 54a are directly connected to the common contact 94a of the induction heating units 20a, 22a, 24a, 26a, 28a.
  • the induction heating units 26a, 28a form a common heating area 39a.
  • This circuit can be expanded to include more than five induction heating units or limited to four or three induction heating units. Designs are also conceivable in which no two or more than two of the induction heating units form a common heating area.
  • the Figure 3 shows an alternative circuit of an induction heating device 12b.
  • the induction heating device 12b has five induction heating units 20b, 22b, 24b, 26b, 28b, each of which is formed by a single inductor designed as an induction heating element, which are assigned to a heating frequency unit 60b.
  • a switching arrangement 92b of the induction heating device 12b which is connected directly to a voltage tap 90b of the heating frequency unit 60b, has four switching elements 40b, 42b, 44b, 46b, which are designed as relays designed as single-pole changeover switches. Switching elements designed as single-pole changeover switches are intended to directly connect a first contact with a second contact in a first stable state and to directly connect the first and a third contact in a second stable state.
  • the second contact of the switching element is intended to be understood as the upper contact and the third contact as the lower contact.
  • a control unit 64b of the induction heating device 12b is intended to establish direct connections between the heating frequency unit 60b and the induction heating units 20b, 22b, 24b, 26b, 28b by controlling the switching elements 40b, 42b, 44b, 46b of the switching arrangement 92b.
  • a first contact of a first switching element 40b is connected directly to the voltage tap 90b.
  • a first contact of a second switching element 42b is directly connected to a second contact of the first switching element 40b and a first contact of a third switching element 44b is directly connected to a third contact of the first switching element 40b.
  • a first contact of a fourth switching element 46b is connected to a third contact of the third switching element 44b.
  • a first contact of one of the induction heating units 20b, 22b, 24b, 26b, 28b is directly connected to the second and third contacts of the second and fourth switching elements 42b, 46b and the second contact of the third switching element 44b.
  • This arrangement means that two switching elements 30b, 32b or 30b, 36b are arranged between the three induction heating units 20b, 22b, 24b and the heating frequency unit 60b and three switching elements 30b, 36b, 38b between the two induction heating units 26b, 28b and the heating frequency unit 60b.
  • the second contacts of the induction heating units 20b, 22b, 24b, 26b, 28b are directly connected to one another and form a common contact 94b, which is directly analogous to a resonance unit 50b Figure 2 connected is.
  • the two induction heating units 26b, 28b form a common heating area 39b.
  • the fourth switching element 46b of the switching arrangement is replaced by two switching elements which are designed as single-pole on-switches. Two directly connected first contacts of the two switching elements would take the place of the first contact of the fourth switching element 46b and the second contacts of the two switching elements would each form the second and third contact of the fourth switching element 46b.
  • modifications of the circuit with only three or four or more than five induction heating units are conceivable.
  • the fourth switching element 46b and the fifth induction heating unit 28b would be omitted and the first contact of the fourth induction heating unit 26b would be connected directly to the third contact of the third switching element 44b.
  • the third and fourth switching elements 44b, 46b and the fourth and fifth induction heating units 26b, 28b would be omitted and the first contact of the third induction heating unit 24b would be connected directly to the third contact of the first switching element 40b.
  • the induction heating device 12c has four induction heating units 20c, 22c, 24c, 26c, each with an induction heating element designed as an inductor, which are assigned to a single heating frequency unit 60c of the induction heating device 12c and can be connected to the heating frequency unit 60c via a first switching arrangement 92c of the induction heating device 12c.
  • the switching arrangement 92c can be analogous to the switching arrangements 92a, 92b Figure 2 or Figure 3 or a combination of these switching arrangements 92a, 92b.
  • Two pairs of induction heating units 20c, 22c and 24c, 26c each have a common contact 94c, 95c.
  • the induction heating device 12c has a first and a second resonance unit 50c, 51c and a second switching arrangement 93c, which is intended to assign either the first or the second resonance unit 50c, 51c to the pairs of induction heating units 20c, 22c and 24c, 26c .
  • the resonance units 50c, 51c are both of the resonance unit 50a type Figure 2 , but have different resonance capacitances 52c, 54c and 53c, 55c.
  • the second switching arrangement 93c has two switching elements 56c, 58c, which are designed as relays designed as single-pole changeover switches.
  • a first contact of the switching elements 56c, 58c is each directly connected to a common contact 94c, 95c of one of the pairs of induction heating units 20c, 22c and 24c, 26c, respectively, and the second and third contacts are each directly connected to the first and second resonance units 50c, respectively. 51c connected.
  • the second switching arrangement 93c like the first switching arrangement 92c, is controlled by a control unit 64c of the induction heating device 12c.
  • the resonance units 50c, 51c are assigned to the pairs of induction heating units 20c, 22c or 24c, 26c depending on a power requested for the induction heating units 20c, 22c, 24c, 26c.
  • any other number of induction heating units each have a common contact that can be connected to either the first or second resonance unit 50c, 51c.
  • Embodiments are also conceivable in which groups of induction heating units and/or individual induction heating units are permanently connected to the resonance units 50c, 51c, i.e. without additional switching elements. Versions with more than two resonance units are also conceivable.
  • An induction heating device 12d has four induction heating units 20d, 22d, 24d, 26d, which are assigned to a first heating frequency unit 60d of the induction heating device 12d and can be directly connected to the induction heating device 12d via a switching arrangement 92d.
  • Two pairs of induction heating units 20d, 22d and 24d, 26d each have a common contact 94d, 95d, which is directly connected to one of two resonance units 50d, 51d.
  • the resonance units 50d, 51d are formed by a single resonance capacitance 52d, 53d, each made up of a single capacitor.
  • the size of the resonance capacitances 52d, 53d is adapted to the properties of the associated induction heating units 20d, 22d or 24d, 26d, for example to their inductance.
  • a first contact of the resonance units 50d, 51d is connected directly to the common contact 94d, 95d of one of the pairs of induction heating units 20d, 22d or 24d, 26d and a second contact of the resonance units 50d, 51d is directly connected to a voltage tap 91d of a second heating frequency unit 61d , which is constructed like the heating frequency unit 60d or 60a.
  • a control unit 64d of the induction heating device 12d is provided to control the switching arrangement 92d and the two heating frequency units 60d, 61d.
  • analogue Figure 4 Switching elements are provided which enable groups of induction heating units with common contact to be assigned to the different resonance units. Likewise, all induction heating units can have a common contact that is directly connected to a single resonance unit.
  • relays that are designed as single-pole on-switches can also be replaced by semiconductor switches, such as transistors, in particular IGBTs.
  • a common contact of the induction heating units can connect the first contacts of the induction heating units and the voltage tap of the heating frequency unit and a switching arrangement is connected to the second contacts of the induction heating units connected and is intended to establish a direct connection between at least one of the induction heating units and at least one of the resonance units.
  • control unit 64a is intended to control the induction heating units 20a, 22a, 24a, 26a, 28a for one in an operating mode in which heating power is requested by an operator for two or more of the induction heating units 20a, 22a, 24a, 26a, 28a Power is required to be operated in sections.
  • the control unit 64a is planned for such a section of the section, starting points 102a, 106a, 110a, 114a of two consecutive operating sections 100a, 104a, 108a, 112a of any induction heater 20a, 22a, 24a, 28a, 28a with at least 100 ms and start points 102a, 114a from two successive operating sections 100a, 112a of an induction heating unit 20a, 22a, 24a, 26a, 28a with 2 s.
  • the three induction heating units 20a, 22a and 26a are operated in sections.
  • the first (top) diagram of the Figure 6 shows a course of the power P provided via the heating frequency unit 60a as a function of the time t.
  • a first operating section 100a the switching element 40a of the switching arrangement is closed, so that the first induction heating unit 20a is directly connected to the heating frequency unit 60a and is supplied with high-frequency alternating current.
  • the remaining switching elements 42a, 44a, 46a, 48a are open.
  • a second operating section 104a follows, in which the switching element 42a of the switching arrangement 92a is closed and the remaining switching elements 40a, 44a, 46a, 48a are open and thus the induction heating unit 22a is connected directly to the heating frequency unit 60a.
  • the starting point 106a of the second operating section 104a is 100 ms apart from the starting point 102a of the first operating section 100a.
  • a third operating section 108a follows, in which the induction heating unit 26a is connected directly to the heating frequency unit 60a.
  • the switching element 46a is closed and the remaining switching elements 40a, 42a, 44a, 48a are open.
  • the starting point 110a of the third operating section is 700 ms apart from the starting point 106a of the second operating section 104a.
  • a fourth operating section 112a follows, in which the induction heating unit 20a is again connected directly to the heating frequency unit 60a in a known manner.
  • the starting point 114a of the fourth operating section 112a is separated by 1.2 s from the starting point 110a of the third operating section 108a and by 2 s from the starting point 102a of the first operating section 100a.
  • the operation of the induction heating units 20a, 22a, 26a continues periodically.
  • the switching elements 40a, 42a, 44a, 46a, 48a of the switching arrangement 92a are switched between the operating sections 100a, 104a, 108a, 112a. Such a switchover takes place, as shown in detail in the second (lower) diagram, during a minimum point 116a of the pulsating direct voltage U which is present between the external contacts 70a, 72a ( Figure 7 ).
  • 7 ms response time 118a of the switching elements 40a, 42a, 44a, 46a, 48a is estimated for the switchover.
  • the response time 118a i.e. from 3.5 ms before a minimum point 116a to 3.5 ms after the minimum point 116a
  • the heating frequency unit 60a is switched off, so the IGBTs 82a, 84a do not receive any control signals.
  • the operating sections 100a, 104a, 108a, 112a of different induction heating units 20a, 22a, 26a are thus spaced apart by at least 7 ms.
  • a spacing of more than 7 ms between successive operating sections 100a, 104a, 108a, 112a is avoided for total powers over 500 W.
  • a length of an operating section 100a, 104a, 108a, 112a of an induction heating unit 20a, 22a, 24a, 26a, 28a and a frequency set therein at the heating frequency unit 60a are of a power requested for the induction heating unit 20a, 22a, 24a, 26a, 28a and a sum of the requested services for all induction heating units 20a, 22a, 24a, 26a, 28a to be operated.
  • the boundary condition is met that the performance of the individual operating sections 100a, 104a, 108a, 112a deviate from the required total performance by less than 10%.
  • control unit is in an arrangement in which two induction heating units form a common heating area and in which a first contact of the induction heating units is each directly connected to a second contact of a first or second single-pole on-switch and the first contacts of the first and second single-pole on-switch directly are connected to each other, intended to operate the two induction heating units in identical operating sections in an operating section in which power is required for both induction heating units.

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

Claims (7)

  1. Dispositif de champ de cuisson à induction avec au moins une unité de fréquence de chauffe (60a ; 60b ; 60c ; 60d, 61d) et avec au moins trois unités de chauffe à induction (20a, 22a, 24a, 26a, 28a; 20b, 22b, 24b, 26b, 28b ; 20c, 22c, 24c, 26c; 20d, 22d, 24d, 26d) affectées à l'unité de fréquence de chauffe (60a ; 60b ; 60c ; 60d, 61 d), dans lequel dans chaque état de fonctionnement dans lequel une des unités de chauffe à induction (20a, 22a, 24a, 26a, 28a ; 20b, 22b, 24b, 26b, 28b ; 20c, 22c, 24c, 26c ; 20d, 22d, 24d, 26d) est alimentée en courant alternatif à haute fréquence, l'unité de fréquence de chauffe (60a ; 60b ; 60c ; 60d, 61d) est directement reliée à l'unité de chauffe à induction (20a, 22a, 24a, 26a, 28a ; 20b, 22b, 24b, 26b, 28b ;20c, 22c, 24c, 26c ; 20d, 22d, 24d, 26d), et avec au moins une unité de commande (64a ; 64b ; 64c ; 64d) au moins prévue afin d'exploiter de manière intermittente, dans au moins un mode de fonctionnement au moins deux des unités de chauffe à induction (20a, 22a, 24a, 26a, 28a ; 20b, 22b, 24b, 26b, 28b ; 20c, 22c, 24c, 26c ; 20d, 22d, 24d, 26d), caractérisé en ce que l'unité de commande (64a ; 64b ; 64c ; 64d) est prévue dans des modes de fonctionnement avec exploitation intermittente d'au moins deux unités de chauffe à induction (20a, 22a, 24a, 26a, 28a ; 20b, 22b, 24b, 26b, 28b ; 20c, 22c, 24c, 26c ; 20d, 22d, 24d, 26d), afin d'écarter les instants de départ (102a, 106a, 110a, 114a) de deux séquences d'exploitation consécutives (100a, 104a, 108a, 112a) d'unité de chauffe à induction quelconques (20a, 22a, 24a, 26a, 28a ; 20b, 22b, 24b, 26b, 28b ; 20c, 22c, 24c, 26c ; 20d, 22d, 24d, 26d) d'au moins 50 ms.
  2. Dispositif de champ de cuisson à induction selon la revendication 1, caractérisé en ce qu'au moins deux des unités de chauffe à induction (20a, 22a, 24a, 26a, 28a ; 20b, 22b, 24b, 26b, 28b ; 20c, 22c, 24c, 26c ; 20d, 22d, 24d, 26d) constituent une zone de chauffe commune (39a, 39b).
  3. Dispositif de champ de cuisson à induction selon l'une des revendications précédentes, caractérisé en ce qu'au moins deux des unités de chauffe à induction (20a, 22a, 24a, 26a, 28a ; 20b, 22b, 24b, 26b, 28b ; 20c, 22c, 24c, 26c ; 20d, 22d, 24d, 26d) présentent un contact commun (94a ; 94b ; 94c, 95c ; 94d, 95d).
  4. Dispositif de champ de cuisson à induction selon la revendication 3, caractérisé par une unité de résonance (50a ; 50b ; 50c, 51c ; 50d, 51d) reliée directement à un contact commun (94a ; 94b ; 94c, 95c ; 94d, 95d) dans au moins un état de fonctionnement.
  5. Dispositif de champ de cuisson à induction selon l'une des revendications précédentes, caractérisé en ce que l'unité de commande (64a ; 64b ; 64c ; 64d) est prévue, au moins dans un mode de fonctionnement avec exploitation intermittente d'au moins deux unités de chauffe à induction (20a, 22a, 24a, 26a, 28a ; 20b, 22b, 24b, 26b, 28b ; 20c, 22c, 24c, 26c ; 20d, 22d, 24d, 26d), afin d'écarter les instants de départ (102a, 114a) d'au moins deux séquences d'exploitation consécutives (100a, 112a) d'une unité de chauffe à induction (20a, 22a, 24a, 26a, 28a ; 20b, 22b, 24b, 26b, 28b ; 20c, 22c, 24c, 26c ; 20d, 22d, 24d, 26d) d'un maximum de 7 s.
  6. Dispositif de champ de cuisson à induction selon l'une des revendications précédentes, caractérisé par au moins deux éléments de commutation (40b, 42b, 44b, 46b, 48b) disposés entre l'unité de fréquence de chauffe (60b ; 60c ; 60d, 61d) et au moins une des unités de chauffe à induction (20b, 22b, 24b, 26b, 28b ; 20c, 22c, 24c, 26c ; 20d, 22d, 24d, 26d).
  7. Champ de cuisson à induction avec un dispositif de champ de cuisson à induction (12a ; 12b ; 12c ; 12d) selon l'une des revendications précédentes.
EP12158709.1A 2011-03-29 2012-03-09 Dispositif de chauffage à induction Active EP2506667B2 (fr)

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EP2506667A2 EP2506667A2 (fr) 2012-10-03
EP2506667A3 EP2506667A3 (fr) 2013-01-23
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Publication number Priority date Publication date Assignee Title
EP2744300B1 (fr) * 2012-12-11 2015-11-18 BSH Hausgeräte GmbH Dispositif domestique de chauffage par induction

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1281843B1 (it) 1995-01-25 1998-03-03 Meneghetti Ampelio & C S N C Dispositivo di controllo particolarmente per fornelli ad induzione multipiastra
DE102006058874A1 (de) * 2006-12-06 2008-06-19 E.G.O. Elektro-Gerätebau GmbH Verfahren zum Steuern von Induktionsheizeinrichtungen bei einem Elektokochgerät
ES2338057T5 (es) 2007-01-23 2023-03-09 Whirlpool Co Método de control para una placa de cocina de inducción y placa de cocina de inducción adaptada para llevar a cabo dicho método
ES2330496B1 (es) * 2007-10-31 2010-09-08 Bsh Electrodomesticos España, S.A. Dispositivo de coccion.
ES2353890B1 (es) * 2008-12-19 2012-01-26 Bsh Electrodomesticos España, S.A. Campo de cocción con al menos tres zonas de calentamiento.

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EP2506667B1 (fr) 2016-10-19
ES2606530T3 (es) 2017-03-24
EP2506667A2 (fr) 2012-10-03
ES2606530T5 (es) 2024-06-27

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