EP2506667B1 - Induction heating device - Google Patents
Induction heating device Download PDFInfo
- Publication number
- EP2506667B1 EP2506667B1 EP12158709.1A EP12158709A EP2506667B1 EP 2506667 B1 EP2506667 B1 EP 2506667B1 EP 12158709 A EP12158709 A EP 12158709A EP 2506667 B1 EP2506667 B1 EP 2506667B1
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- Prior art keywords
- induction heating
- unit
- induction
- heating units
- units
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- 238000010438 heat treatment Methods 0.000 title claims description 241
- 230000006698 induction Effects 0.000 title claims description 193
- 238000000034 method Methods 0.000 claims 1
- 239000003990 capacitor Substances 0.000 description 11
- 230000005291 magnetic effect Effects 0.000 description 5
- 230000002457 bidirectional effect Effects 0.000 description 4
- 238000010411 cooking Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000013016 damping Methods 0.000 description 3
- 230000001419 dependent effect Effects 0.000 description 3
- 230000005405 multipole Effects 0.000 description 3
- 230000004907 flux Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 230000005417 remagnetization Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Images
Classifications
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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 heaters are known in the art which have a plurality 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 by the features of claim 1, while advantageous embodiments and modifications of the invention can be taken from the dependent claims.
- the invention is based on an induction heating device, in particular an induction hob device, with at least one heating frequency unit and at least three induction heating units, which are assigned to the heating frequency unit.
- the induction heating device has at least one control unit which is at least provided to operate at least two of the induction heating units in sections in at least one operating mode.
- a "heating frequency unit” should in particular be understood to mean an electrical unit which generates an oscillating electrical signal, preferably at a frequency of at least 1 kHz, in particular of at least 10 kHz, advantageously of at least 20 kHz, and in particular of not more than 100 kHz for an induction heating unit ,
- the heating frequency unit is provided to provide a maximum electrical power of at least 1000 W, in particular at least 2000 W, advantageously at least 3000 W, and preferably at least 3500 W, required by the induction heating unit.
- the heating frequency unit comprises at least one inverter, which preferably has at least two, preferably series-connected, bidirectional unipolar switches, in particular of a transistor and a parallel diode are formed, and particularly advantageous at least in each case a parallel to the bidirectional unipolar switches switched damping capacitance, which is in particular formed by at least one capacitor comprises.
- a high-frequency power supply of the induction heating unit can be provided.
- a voltage tap of the radio-frequency unit is arranged in particular at a common contact point of two bidirectional unipolar switches.
- An "induction heating unit” is to be understood in particular as a unit having 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 provided to convert electrical energy into an alternating magnetic field, which is intended to cause in a metallic, preferably at least partially ferromagnetic, heating means, in particular cooking utensils, eddy currents and / or remagnetization effects, which are converted into heat.
- the induction heating device 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 provided to produce 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 meaning an electrical connection which, at least in an operating state with a current flow of alternating current via the connection with a frequency between 1 kHz and 100 kHz, has an impedance which is smaller than its magnitude 10 V / A, in particular less than 1 V / A, preferably less than 0.1 V / A and whose amount fluctuates in particular over a frequency range from 1 kHz to 100 kHz by a maximum of 10%, preferably a maximum of 3%.
- switching element is intended in particular, an electrical component with at least two electrical contacts and at least two states are understood.
- a “contact” is to be understood in particular an electrical connection point of an electrical component.
- a switching element has a control member which can be controlled with low voltage, in particular a voltage between 12 V and 24 V, and causes a change of state of the switching element.
- a switching element is designed as a relay, which is preferably designed as a single or multi-pole power switch or as a single or multi-pole changeover switch.
- a "control unit” should in particular be understood 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 provided to control and / or regulate at least the heating frequency unit and the switching arrangement.
- the 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 preferably comprises a computing unit and, in particular in addition to the computing unit, a memory unit with a control and / or regulating program stored therein, which is intended to be executed by the computing unit.
- the induction heating unit is alternately, preferably periodically alternating, active or inactive.
- the induction heating unit is “active” should be understood in particular that it is continuously supplied with high-frequency alternating current over a period of at least 10 ms.
- the induction heating unit is “inactive” is to be understood in particular that it differs from an active induction heating unit and in particular over a period of at least 10 ms less than 10 W, in particular less than 1 W and preferably less than 0.1 W. at electrical power absorbs.
- An “operating section” should be understood in particular to be a time range in which the induction heating unit is active.
- operating sections of the one induction heating unit are different from operating sections of the other induction heating unit.
- a first and a second operating section “differ”, it should be understood in particular that a starting point of the second operating section is behind an end point of the first operating section.
- a flexible supply of the induction heating units can be achieved.
- At least two of the induction heating units form a common heating area.
- a “heating zone” is to be understood in particular as meaning an area of action of the magnetic alternating field generated by the induction heating unit in at least one operating state.
- An “effective range” is to be understood in particular as a range 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 momentary maximum magnetic flux density of the alternating magnetic field.
- a heating area is an area that is in an operating condition directly above the induction heating unit on a cooktop panel.
- two induction heating units form a "common" heating area
- the heating areas of both induction heating units are at least 2 cm apart, preferably at most 1 cm, advantageously at most 0.1 cm apart and preferably partially overlap in at least one area.
- the at least two induction heating units are arranged concentrically.
- the control unit is provided, in at least one operating mode, to operate the at least two induction heating units in identical operating sections. In particular, a uniform heating of a large area can be achieved.
- At least two of the induction heating units have a common contact.
- a "common contact” should in particular be understood as 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 as meaning, in particular, a unit which has at least one resonance capacity, preferably of at least one Capacitor is formed, which is preferably different from a damping capacity and / or a capacitance, which is connected in parallel to a switching element.
- a resonant capacitance is formed by a combination of series and parallel circuits of a plurality of capacitors.
- the resonance capacity is in particular part of an electrical resonant circuit, in particular of an electrical series resonant circuit.
- the resonance capacitance in at least one operating state is connected in series with the induction heating unit 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 capacity is arranged in particular on a side of the induction heating unit facing away from the frequency unit, viewed in the direction of a line path.
- an induction heating unit is operated in a full bridge circuit.
- the induction heating unit is arranged together with a, preferably in series with the induction heating unit, resonant capacitance between two voltage dividing units formed by Schufrequenzüen in the bridge branch.
- an induction heating unit is 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 resonance capacitances in the bridge branch. In particular, costs can be reduced.
- control unit is provided, at least in an operating mode with section-wise operation of at least two induction heating units, starting points of two successive operating sections of any Indudictionsweechen with at least 50 ms, preferably at least 100 ms to space.
- 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.
- an overload of switching elements, in particular relays can be avoided.
- control unit is provided, at least in an operating mode with section-wise 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, advantageously a maximum of 3 s, and preferably a maximum of 2 s, to space.
- a maximum of 7 s in particular a maximum of 5 s, advantageously a maximum of 3 s, and preferably a maximum of 2 s
- 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 designed as single or multi-pole changeover switch.
- the first switching element with the Wienfrequenzü with the first switching element, the second switching element and the second switching element, the induction heating directly connected.
- a low switching frequency and thus a low wear of the switching elements can be achieved.
- FIG. 1 shows a designed as an induction hob home appliance 10a with an induction hob as trained induction heating device 12a with five induction heating units 20a, 22a, 24a, 26a, 28a, each having an induction heating element designed as an inductor.
- the induction heating units 20a, 22a, 24a, 26a, 28a are disposed below a cooktop panel 14a.
- heating areas 30a, 32a, 34a, 36a, 38a formed directly above the induction heating units 20a, 22a, 24a, 26a, 28a are arranged as cooking zones.
- the heating areas 36a, 38a of the induction heating units 26a, 28a are concentrically arranged to form a common heating area 39a.
- the induction heating units 20a, 22a, 24a, 26a, 28a are provided to heat cooking utensils placed on the induction heating unit 20a, 22a, 24a, 26a, 28a, 30a, 32a, 34a, 36a, 38a.
- the induction heating device 12a has a power module 18a operated by a single phase 16a of a three-phase domestic connection, which is intended to provide 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.
- the frequency is dependent on a heating power demanded 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 controlled by a control unit 64a Induction heater 12a determined.
- the control unit 64a has an arithmetic unit, a memory unit and an operating program stored in the memory unit, which is intended to be executed by the arithmetic unit.
- FIG. 2 shows a first circuit for the induction heater 12a, which in an induction hob after FIG. 1 Can be used.
- a voltage applied to a phase 16a mains voltage between 220 V and 230 V with a mains frequency between 49 Hz and 51 Hz is rectified in a rectifier 66a and partially stored in a buffer capacity 68a.
- the poles of the buffer capacitor 68a form two external contacts 70a, 72a between which a pulsating DC voltage is applied.
- the heating frequency unit 60a is arranged between the external contacts 70a, 72a and converts the pulsating DC voltage into a high-frequency alternating current.
- the heating frequency unit 60a has two switching elements 74a, 76a which are connected in series between the external contacts 70a, 72a and designed as bidirectional unipolar switches, each having a parallel-connected damping capacitor 78a, 80a.
- the switching elements 74a, 76a are each formed by an IGBT 82a, 84a (insulated gate bipolar transistor) and a parallel-connected diode 86a, 88a.
- a voltage tap 90a is disposed at a common contact of the two IGBTs 82a, 84a.
- the control unit 64a causes a high-frequency alternating voltage by alternately high-frequency driving of the two IGBTs 82a, 84a at the voltage tap 90a, 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 heater 12a.
- the switching arrangement 92a has five switching elements 40a, 42a, 44a, 46a, 48a, which are designed as, designed as a single-pole switch, relays.
- a first of two contacts of the switching elements 40a, 42a, 44a, 46a, 48a (the left-hand contact in the illustration, respectively) is connected directly to the input contact 96a.
- a second contact of the switching elements 40a, 42a, 44a, 46a, 48a is in each case 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 of the control unit 64a.
- the control unit 64a is provided to connect induction heating units 20a, 22a, 24a, 26a, 28a directly to the heating frequency unit 60a by driving the switching elements 40a, 42a, 44a, 46a, 48a.
- Second contacts of the induction heating units 20a, 22a, 24a, 26a, 28a are directly connected to each other and form a common contact 94a.
- a resonance unit 50a which is formed by two resonance capacitances 52a, 54a of substantially equal 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 arbitrarily extended to more than five induction heating units or limited to four or three induction heating units. Embodiments are also conceivable in which no two or more than two of the induction heating units form a common heating area.
- FIGS. 3 to 5 Further embodiments of the invention are shown. The following descriptions are essentially limited to the differences between the embodiments, with respect to the same components, features and functions on the description of the other embodiments, in particular the FIGS. 1 and 2 , can be referenced. To distinguish the embodiments, the letter a in the reference numerals of the embodiment in the FIGS. 1 and 2 by the letters b, c and d in the reference numerals of the embodiments of FIGS. 3 to 5 replaced. With regard to identically designated components, in particular with regard to components with the same reference numerals, can in principle also to the drawings and / or the description of the other embodiments, in particular the FIGS. 1 and 2 , to get expelled.
- the FIG. 3 shows an alternative circuit of an induction heater 12b.
- the induction heating device 12b has five induction heating units 20b, 22b, 24b, 26b, 28b, each formed by a single inductor formed as an induction heating element, associated with a heating frequency unit 60b.
- a switching arrangement 92b of the induction heating device 12b which is directly connected to a voltage tap 90b of the heating frequency unit 60b, has four switching elements 40b, 42b, 44b, 46b acting as a single pole changeover switch trained, relays are formed. Switching elements designed as single-pole changeover switches are intended to connect a first contact directly to a second contact in a first stable state and to connect the first and a third contact directly in a second stable state.
- a control unit 64b of the induction heating device 12b is provided to make direct connections between the heating frequency unit 60b and the induction heating units 20b, 22b, 24b, 26b, 28b by driving the switching elements 40b, 42b, 44b, 46b of the switching arrangement 92b.
- a first contact of a first switching element 40b is directly connected 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 each of the second and third contacts of the second and fourth switching elements 42b, 46b and the second contact of the third switching element 44b.
- two switching elements 30b, 32b and 30b, 36b respectively and three switching elements 30b, 36b, 38b are disposed 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 each other and form a common contact 94b, which is directly analogous to a resonance unit 50b FIG. 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 a single-pole power switch. 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 contacts of the fourth switching element 46b.
- modifications of the circuit with only three or four or with 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 directly connected 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 directly connected to the third contact of the first switching element 40b.
- the induction heater 12c has four induction heating units 20c, 22c, 24c, 26c, each having an induction heating element formed as an inductor, associated with a single heating frequency unit 60c of the induction heater 12c and connectable to the heating frequency unit 60c via a first switching arrangement 92c of the induction heater 12c.
- the switching arrangement 92c may be analogous to the switching arrangements 92a, 92b FIG. 2 or FIG. 3 or a combination of these switch assemblies 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 first and second resonance units 50c, 51c and a second switching arrangement 93c which is provided to associate 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 type of the resonance unit 50a FIG. 2 , but have different sized resonance capacitances 52c, 54c and 53c, 55c.
- the second switching arrangement 93c has two switching elements 56c, 58c which are designed as relays formed as single-pole changeover switches.
- a first contact of the switching elements 56c, 58c is 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 respectively directly connected to the first and second resonance units 50c, 51 c connected.
- the second switching arrangement 93c like the first switching arrangement 92c, is controlled by a control unit 64c of the induction heating apparatus 12c. An assignment of the resonance units 50c, 51c to the pairs of induction heating units 20c, 22c and 24c, 26c takes place in FIG Dependence on a power demanded for the induction heating units 20c, 22c, 24c, 26c.
- any other numbers of induction heating units each have a common contact that can be connected to either the first or the second resonance unit 50c, 51c.
- Embodiments are also conceivable in which groups of induction heating units and / or individual induction heating units, ie without additional switching elements, are directly connected to the resonance units 50c, 51c. Also, designs with more than two resonance units are conceivable.
- An induction heating device 12d has four induction heating units 20d, 22d, 24d, 26d, which are associated with 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 directly connected to each one of two resonance units 50d, 51d.
- the resonance units 50d, 51d are formed by a single resonance capacitor 52d, 53d, each consisting of a single capacitor.
- the size of the resonance capacitors 52d, 53d is in this case adapted to the properties of the associated induction heating units 20d, 22d or 24d, 26d, that is, for example, to their inductance.
- a first contact of the resonance units 50d, 51d is directly connected to the common contact 94d, 95d of one of the pairs of induction heating units 20d, 22d and 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 and 60a, respectively.
- a control unit 64d of the induction heating device 12d is provided to drive the switching arrangement 92d and the two heating frequency units 60d, 61d.
- FIG. 4 Switching elements are provided which allow an assignment of groups of induction heating units in common contact with the different resonance units. Likewise, everyone can Induction heating units have a common contact, which is connected directly to a single resonance unit.
- relays which are designed as single-pole power-on switches can also be replaced by semiconductor switches, such as transistors, in particular IGBTs.
- common contact of the induction heating units may 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 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.
- FIG. 6 is a possible operation of the example of the first embodiment, identified by the reference numeral "a", shown.
- the control unit 64a is provided, in an operation mode in which two or more of the induction heating units 20a, 22a, 24a, 26a, 28a are requested by an operator, the induction heating units 20a, 22a, 24a, 26a, 28a for the one Performance is required to operate in sections.
- the control unit 64a is provided to space starting points 102a, 106a, 110a, 114a of two successive operating sections 100a, 104a, 108a, 112a of any induction heating units 20a, 22a, 24a, 26a, 28a by at least 100 ms and starting points 102a, 114a of two successive operating sections 100a, 112a of an induction heating unit 20a, 22a, 24a, 26a, 28a of 2 s.
- the three induction heating units 20a, 22a and 26a are operated in sections.
- the first (upper) diagram of the FIG. 6 shows a course of the provided over the heating frequency unit 60a power P as a function of 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 directly connected to the heating frequency unit 60a.
- the starting point 106a of the second operating portion 104a is 100 ms to the starting point 102a of the first operating portion 100a spaced.
- a third operation section 108a follows, in which the induction heating unit 26a is directly connected 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 spaced at 700 ms from the starting point 106a of the second operating section 104a.
- a fourth operating section 112a follows, in which again the induction heating unit 20a is connected in a known manner directly to the heating frequency unit 60a.
- the starting point 114a of the fourth operating section 112a is spaced at 1.2 s from the starting point 110a of the third operating section 108a and at 2 s from the starting point 102a of the first operating section 100a.
- the operation of the induction heating units 20a, 22a, 26a is periodically continued.
- the switching elements 40a, 42a, 44a, 46a, 48a of the switching arrangement 92a are respectively switched over. Such switching over takes place, as shown in detail in the second (lower) diagram, in each case during a minimum point 116a of the pulsating DC voltage U which is present between the external contacts 70a, 72a ( FIG. 7 ).
- response time 118a of the switching elements 40a, 42a, 44a, 46a, 48a are estimated.
- the reaction time 118a ie 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, ie the IGBTs 82a, 84a receive no control signals.
- the operating sections 100a, 104a, 108a, 112a of different induction heating units 20a, 22a, 26a are thus at least 7 ms apart.
- a length of an operating portion 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 required for the induction heating unit 20a, 22a, 24a, 26a, 28a a sum of the requested performances for all to be operated induction heating units 20a, 22a, 24a, 26a, 28a dependent.
- the boundary condition is met that the powers to the individual operating sections 100a, 104a, 108a, 112a deviate less than 10% from the required total power.
- 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 directly connected to a second contact of a first and second single-pole switch, respectively, and the first contacts of the first and second single-pole switches are direct are connected to each other, provided in an operating section in which a power is required for both induction heating units to operate the two induction heating units in identical operating sections.
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- Induction Heating Cooking Devices (AREA)
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Description
Die Erfindung geht aus von einer Induktionsheizvorrichtung nach dem Oberbegriff des Anspruchs 1.The invention is based on an induction heating device according to the preamble of claim 1.
Aus dem Stand der Technik sind Induktionsheizvorrichtungen bekannt, die eine Vielzahl an Induktionsheizelementen aufweisen, die parallel von einem Wechselrichter versorgt werden.Induction heaters are known in the art which have a plurality of induction heating elements which are supplied in parallel by an inverter.
Dokument
Die Aufgabe der Erfindung besteht insbesondere darin, eine gattungsgemäße Vorrichtung mit verbesserten Eigenschaften hinsichtlich einer hohen Flexibilität bereitzustellen. Die Aufgabe wird erfindungsgemäß durch die Merkmale des Patentanspruchs 1 gelöst, während vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung den Unteransprüchen entnommen werden können.The object of the invention is in particular to provide a generic device with improved properties in terms of high flexibility. The object is achieved by the features of claim 1, while advantageous embodiments and modifications of the invention can be taken from the dependent claims.
Die Erfindung geht aus von einer Induktionsheizvorrichtung, insbesondere einer Induktionskochfeldvorrichtung, mit zumindest einer Heizfrequenzeinheit und zumindest drei Induktionsheizeinheiten, die der Heizfrequenzeinheit zugeordnet sind.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, which are assigned to the heating frequency unit.
Es wird vorgeschlagen, dass die Induktionsheizvorrichtung zumindest eine Steuereinheit aufweist, die zumindest dazu vorgesehen ist, in zumindest einem Betriebsmodus wenigstens zwei der Induktionsheizeinheiten abschnittsweise zu betreiben. Unter einer "Heizfrequenzeinheit" soll insbesondere eine elektrische Einheit verstanden werden, die ein oszillierendes elektrisches Signal, vorzugsweise mit einer Frequenz von zumindest 1 kHz, insbesondere von wenigstens 10 kHz, vorteilhaft von mindestens 20 kHz, und insbesondere von maximal 100 kHz für eine Induktionsheizeinheit erzeugt. Insbesondere ist die Heizfrequenzeinheit dazu vorgesehen, eine, von der Induktionsheizeinheit geforderte, maximale elektrische Leistung von zumindest 1000 W, insbesondere zumindest 2000 W, vorteilhaft zumindest 3000 W und vorzugsweise zumindest 3500 W bereitzustellen. Die Heizfrequenzeinheit umfasst insbesondere zumindest einen Wechselrichter, der vorzugsweise zumindest zwei, vorzugsweise in Reihe geschaltete, bidirektionale unipolare Schalter, die insbesondere von einem Transistor und einer parallel geschalteten Diode gebildet sind, und besonders vorteilhaft zumindest jeweils eine parallel zu den bidirektionalen unipolaren Schaltern geschaltete Dämpfungskapazität, die insbesondere von zumindest einem Kondensator gebildet ist, aufweist. Hierdurch kann eine hochfrequente Energieversorgung der Induktionsheizeinheit bereitgestellt werden. Ein Spannungsabgriff der Hochfrequenzeinheit ist insbesondere an einer gemeinsamen Kontaktstelle zweier bidirektionaler unipolarer Schalter angeordnet. Unter einer "Induktionsheizeinheit" soll insbesondere eine Einheit mit zumindest einem Induktionsheizelement verstanden werden. Insbesondere werden in einem Betriebszustand, in dem die Induktionsheizeinheit mit hochfrequentem Wechselstrom versorgt wird, alle Induktionsheizelemente der Induktionsheizeinheit, vorzugsweise gleichzeitig, mit hochfrequentem Wechselstrom versorgt. Unter einem "Induktionsheizelement" soll insbesondere ein gewickelter elektrischer Leiter verstanden werden, vorzugsweise in Form einer Kreisscheibe, der in zumindest einem Betriebszustand von hochfrequentem Wechselstrom durchflossen wird. Das Induktionsheizelement ist vorzugsweise dazu vorgesehen, elektrische Energie in ein magnetisches Wechselfeld umzuwandeln, das dazu vorgesehen ist, in einem metallischen, vorzugsweise zumindest teilweise ferromagnetischen, Heizmittel, insbesondere einem Gargeschirr, Wirbelströme und/oder Ummagnetisierungseffekte hervorzurufen, die in Wärme umgewandelt werden. Darunter, dass eine Induktionsheizeinheit einer Heizfrequenzeinheit "zugeordnet" ist, soll insbesondere verstanden werden, dass in jedem Betriebszustand, in dem die Induktionsheizeinheit mit hochfrequentem Wechselstrom versorgt wird, die Heizfrequenzeinheit direkt mit der Induktionsheizeinheit verbunden ist. Vorzugsweise weist die Induktionsheizvorrichtung zumindest eine Schaltanordnung mit zumindest zwei Schaltelementen, die sich von Schaltelementen einer Heizfrequenzeinheit unterscheiden, auf, die insbesondere dazu vorgesehen ist, zumindest eine direkte Verbindung von der Heizfrequenzeinheit, vorzugsweise dem Spannungsabgriff der Heizfrequenzeinheit, zu mindestens einer der Induktionsheizeinheiten herzustellen. Unter einer "direkten Verbindung" soll insbesondere eine elektrische Verbindung verstanden werden, die, zumindest in einem Betriebszustand mit einem Stromfluss von Wechselstrom über die Verbindung mit einer Frequenz zwischen 1 kHz und 100 kHz, eine Impedanz aufweist, die von ihrem Betrag her kleiner ist als 10 V/A, insbesondere kleiner ist als 1 V/A, vorzugsweise kleiner ist als 0,1 V/A und deren Betrag insbesondere über einen Frequenzbereich von 1 kHz bis 100 kHz um maximal 10 %, vorzugsweise maximal 3 % schwankt. Unter einem "Schaltelement" soll insbesondere ein elektrisches Bauteil mit zumindest zwei elektrischen Kontakten und zumindest zwei Zuständen verstanden werden. Unter einem "Kontakt" soll insbesondere ein elektrischer Anschlusspunkt eines elektrischen Bauteils verstanden werden. In einem ersten Zustand sind die beiden Kontakte direkt verbunden und der zweite Zustand unterscheidet sich vom ersten Zustand. Insbesondere ist im zweiten Zustand einer der beiden Kontakte mit einem dritten Kontakt direkt verbunden. Vorzugsweise weist ein Schaltelement ein Steuerglied auf, das mit Niederspannung, insbesondere einer Spannung zwischen 12 V und 24 V, ansteuerbar ist und einen Zustandswechsel des Schaltelements verursacht. Insbesondere ist ein Schaltelement als Relais ausgebildet, das vorzugsweise als ein- oder mehrpoliger Einschalter oder als ein- oder mehrpoliger Wechselschalter ausgebildet ist. Unter einer "Steuereinheit" soll insbesondere eine elektronische Einheit verstanden werden, die vorzugsweise in einer Steuer- und/oder Regeleinheit der Induktionsheizvorrichtung zumindest teilweise integriert ist und die vorzugsweise dazu vorgesehen ist, zumindest die Heizfrequenzeinheit und die Schaltanordnung zu steuern und/oder zu regeln. Insbesondere steuert die Steuereinheit die Steuerglieder der Schaltelemente der Schaltanordnung an, um zumindest eine Verbindung zwischen der Heizfrequenzeinheit und zumindest einer der Induktionsheizeinheiten herzustellen. Vorzugsweise umfasst die Steuereinheit eine Recheneinheit und insbesondere zusätzlich zur Recheneinheit eine Speichereinheit mit einem darin gespeicherten Steuer- und/oder Regelprogramm, das dazu vorgesehen ist, von der Recheneinheit ausgeführt zu werden. Darunter, dass eine Induktionsheizeinheit "abschnittsweise" betrieben wird, soll insbesondere verstanden werden, dass die Induktionsheizeinheit abwechselnd, vorzugsweise periodisch abwechselnd, aktiv oder inaktiv ist. Darunter, dass die Induktionsheizeinheit "aktiv" ist, soll insbesondere verstanden werden, dass sie über eine Dauer von zumindest 10 ms kontinuierlich mit hochfrequentem Wechselstrom versorgt wird. Darunter, dass die Induktionsheizeinheit "inaktiv" ist, soll insbesondere verstanden werden, dass sie sich von einer aktiven Induktionsheizeinheit unterscheidet und insbesondere über eine Dauer von zumindest 10 ms weniger als 10 W, insbesondere weniger als 1 W und vorzugsweise weniger als 0,1 W an elektrischer Leistung aufnimmt. Unter einem "Betriebabschnitt" soll insbesondere ein zeitlicher Bereich verstanden werden, in dem die Induktionsheizeinheit aktiv ist. Insbesondere unterscheiden sich Betriebsabschnitte der einen Induktionsheizeinheit von Betriebsabschnitten der anderen Induktionsheizeinheit. Darunter, dass sich ein erster und ein zweiter Betriebsabschnitt "unterscheiden", soll insbesondere verstanden werden, dass ein Startpunkt des zweiten Betriebsabschnitts hinter einem Endpunkt des ersten Betriebsabschnitts liegt. Es kann insbesondere eine flexible Versorgung der Induktionsheizeinheiten erreicht werden.It is proposed that the induction heating device has at least one control unit which is at least provided to operate at least two of the induction heating units in sections in at least one operating mode. A "heating frequency unit" should in particular be understood to mean an electrical unit which generates an oscillating electrical signal, preferably at a frequency of at least 1 kHz, in particular of at least 10 kHz, advantageously of at least 20 kHz, and in particular of not more than 100 kHz for an induction heating unit , In particular, the heating frequency unit is provided to provide a maximum electrical power of at least 1000 W, in particular at least 2000 W, advantageously at least 3000 W, and preferably at least 3500 W, required by the induction heating unit. In particular, the heating frequency unit comprises at least one inverter, which preferably has at least two, preferably series-connected, bidirectional unipolar switches, in particular of a transistor and a parallel diode are formed, and particularly advantageous at least in each case a parallel to the bidirectional unipolar switches switched damping capacitance, which is in particular formed by at least one capacitor comprises. As a result, a high-frequency power supply of the induction heating unit can be provided. A voltage tap of the radio-frequency unit is arranged in particular at a common contact point of two bidirectional unipolar switches. An "induction heating unit" is to be understood in particular as a unit having at least one induction heating element. In particular, in an operating state in which the induction heating unit is supplied with high-frequency alternating current, all induction heating elements of the induction heating unit, preferably simultaneously, supplied with high-frequency alternating current. An "induction heating element" is to be understood in particular as a wound electrical conductor, preferably in the form of a circular disk through which high-frequency alternating current flows in at least one operating state. The induction heating element is preferably provided to convert electrical energy into an alternating magnetic field, which is intended to cause in a metallic, preferably at least partially ferromagnetic, heating means, in particular cooking utensils, eddy currents and / or remagnetization effects, which are converted into heat. By "associating" an induction heating unit with a heating frequency unit, it should be understood in particular that in any operating state in which the induction heating unit is supplied with high-frequency alternating current, the heating frequency unit is connected directly to the induction heating unit. Preferably, the induction heating device 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 provided to produce 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 meaning an electrical connection which, at least in an operating state with a current flow of alternating current via the connection with a frequency between 1 kHz and 100 kHz, has an impedance which is smaller than its magnitude 10 V / A, in particular less than 1 V / A, preferably less than 0.1 V / A and whose amount fluctuates in particular over a frequency range from 1 kHz to 100 kHz by a maximum of 10%, preferably a maximum of 3%. Under a "switching element" is intended in particular, an electrical component with at least two electrical contacts and at least two states are understood. A "contact" is to be understood in particular an electrical connection point of an electrical component. In a first state, the two contacts are directly connected and the second state is different from the first state. In particular, in the second state, one of the two contacts is directly connected to a third contact. Preferably, a switching element has a control member which can be controlled with low voltage, in particular a voltage between 12 V and 24 V, and causes a change of state of the switching element. In particular, a switching element is designed as a relay, which is preferably designed as a single or multi-pole power switch or as a single or multi-pole changeover switch. A "control unit" should in particular be understood 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 provided to control and / or regulate at least the heating frequency unit and the switching arrangement. In particular, the 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 preferably comprises a computing unit and, in particular in addition to the computing unit, a memory unit with a control and / or regulating program stored therein, which is intended to be executed by the computing unit. By operating an induction heating unit "in sections", it should be understood in particular that the induction heating unit is alternately, preferably periodically alternating, active or inactive. By the fact that the induction heating unit is "active" should be understood in particular that it is continuously supplied with high-frequency alternating current over a period of at least 10 ms. By the fact that the induction heating unit is "inactive" is to be understood in particular that it differs from an active induction heating unit and in particular over a period of at least 10 ms less than 10 W, in particular less than 1 W and preferably less than 0.1 W. at electrical power absorbs. An "operating section" should be understood in particular to be a time range in which the induction heating unit is active. In particular, operating sections of the one induction heating unit are different from operating sections of the other induction heating unit. By the fact that a first and a second operating section "differ", it should be understood in particular that a starting point of the second operating section is behind an end point of the first operating section. In particular, a flexible supply of the induction heating units can be achieved.
In einer weiteren Ausgestaltung wird vorgeschlagen, dass zumindest zwei der Induktionsheizeinheiten einen gemeinsamen Heizbereich bilden. Unter einem "Heizbereich" soll insbesondere ein Wirkungsbereich des in zumindest einem Betriebszustand von der Induktionheizseinheit erzeugten magnetischen Wechselfelds verstanden werden. Unter einem "Wirkungsbereich" soll insbesondere ein Bereich verstanden werden, in dem eine magnetische Flussdichte zumindest 30%, insbesondere zumindest 45%, vorteilhaft zumindest 60% und vorzugsweise zumindest 75% einer momentanen maximalen magnetischen Flussdichte des magnetischen Wechselfelds entspricht. Vorzugsweise handelt es sich bei einem Heizbereich um eine Fläche, die sich in einem Betriebszustand direkt über der Induktionsheizeinheit auf einer Kochfeldplatte befindet. Darunter, dass zwei Induktionsheizeinheiten einen "gemeinsamen" Heizbereich bilden, soll insbesondere verstanden werden, dass die Heizbereiche beider Induktionsheizeinheiten in zumindest einem Bereich maximal 2 cm, insbesondere maximal 1 cm, vorteilhaft maximal 0,1 cm voneinander beabstandet sind und sich vorzugsweise teilweise überschneiden. Insbesondere sind die zumindest zwei Induktionsheizeinheiten konzentrisch angeordnet. Insbesondere ist die Steuereinheit dazu vorgesehen, in zumindest einem Betriebsmodus, die zumindest zwei Induktionsheizeinheiten in identischen Betriebsabschnitten zu betreiben. Es kann insbesondere eine gleichmäßige Erwärmung eines großen Bereichs erreicht werden.In a further embodiment, it is proposed that at least two of the induction heating units form a common heating area. A "heating zone" is to be understood in particular as meaning an area of action of the magnetic alternating field generated by the induction heating unit in at least one operating state. An "effective range" is to be understood in particular as a range 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 momentary maximum magnetic flux density of the alternating magnetic field. Preferably, a heating area is an area that is in an operating condition directly above the induction heating unit on a cooktop panel. By the fact that two induction heating units form a "common" heating area, it should be understood in particular that the heating areas of both induction heating units are at least 2 cm apart, preferably at most 1 cm, advantageously at most 0.1 cm apart and preferably partially overlap in at least one area. In particular, the at least two induction heating units are arranged concentrically. In particular, the control unit is provided, in at least one operating mode, to operate the at least two induction heating units in identical operating sections. In particular, a uniform heating of a large area can be achieved.
Vorteilhaft weisen zumindest zwei der Induktionsheizeinheiten einen gemeinsamen Kontakt auf. Unter einem "gemeinsamen Kontakt" soll insbesondere ein Kontaktpunkt verstanden werden, zu dem die Induktionsheizeinheiten in jedem beliebigen Betriebszustand, der sich vorzugsweise von einem Betriebszustand mit defekt unterscheidet, direkt verbunden sind. Es können insbesondere Kosten reduziert werden.Advantageously, at least two of the induction heating units have a common contact. A "common contact" should in particular be understood as 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.
Weiterhin wird vorgeschlagen, dass die Induktionsheizeinheit eine Resonanzeinheit aufweist, die in zumindest einem Betriebszustand mit dem gemeinsamen Kontakt direkt verbunden ist. Unter einer "Resonanzeinheit" soll insbesondere eine Einheit verstanden werden, die zumindest eine Resonanzkapazität, die vorzugsweise von zumindest einem Kondensator gebildet ist, umfasst, der vorzugsweise von einer Dämpfungskapazität und/oder einer Kapazität, die zu einem Schaltelement parallelgeschaltet ist, verschieden ist. Insbesondere ist eine Resonanzkapazität von einer Kombination aus Reihen- und Parallelschaltungen von mehreren Kondensatoren gebildet. Die Resonanzkapazität ist insbesondere Bestandteil eines elektrischen Schwingkreises, insbesondere eines elektrischen Reihenschwingkreises. Vorzugsweise ist die Resonanzkapazität in zumindest einem Betriebszustand, insbesondere über ein Schaltelement, in Reihe mit der Induktionsheizeinheit geschaltet und ist besonders vorteilhaft dazu vorgesehen, über die Induktionsheizeinheit durch zumindest eine Heizfrequenzeinheit aufgeladen zu werden, insbesondere wenn die Induktionsheizeinheit durch die Schaltanordnung auf ein höheres elektrisches Potential gelegt wird. Die Resonanzkapazität ist insbesondere auf einer, in Richtung eines Leitungspfads gesehen, von der Frequenzeinheit abgewandten Seite der Induktionsheizeinheit angeordnet. Insbesondere wird eine Induktionsheizeinheit in einer Vollbrückenschaltung betrieben. In einer Vollbrückenschaltung ist die Induktionsheizeinheit gemeinsam mit einer, vorzugsweise in Reihe zur Induktionsheizeinheit geschalteten, Resonanzkapazität zwischen zwei von Heizfrequenzeinheiten gebildeten Spannungsteilern im Brückenzweig angeordnet. Vorzugsweise wird eine Induktionsheizeinheit in einer Halbbrückenschaltung betrieben. In einer Halbbrückenschaltung ist die Induktionsheizeinheit zwischen einem, von der Heizfrequenzeinheit gebildeten, Spannungsteiler und einem, von zwei Resonanzkapazitäten gebildeten, Spannungsteiler im Brückenzweig angeordnet. Es können insbesondere Kosten reduziert werden.Furthermore, it is proposed that 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 as meaning, in particular, a unit which has at least one resonance capacity, preferably of at least one Capacitor is formed, which is preferably different from a damping capacity and / or a capacitance, which is connected in parallel to a switching element. In particular, a resonant capacitance is formed by a combination of series and parallel circuits of a plurality of capacitors. The resonance capacity is in particular part of an electrical resonant circuit, in particular of an electrical series resonant circuit. Preferably, the resonance capacitance in at least one operating state, in particular via a switching element, is connected in series with the induction heating unit 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 capacity is arranged in particular on a side of the induction heating unit facing away from the frequency unit, viewed in the direction of a line path. In particular, 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, preferably in series with the induction heating unit, resonant capacitance between two voltage dividing units formed by Heizfrequenzeinheiten in the bridge branch. Preferably, an induction heating unit is operated in a half-bridge circuit. 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 resonance capacitances in the bridge branch. In particular, costs can be reduced.
Es wird erfindungsgemäß vorgeschlagen, dass die Steuereinheit dazu vorgesehen ist, zumindest in einem Betriebsmodus mit abschnittsweisem Betrieb von zumindest zwei Induktionsheizeinheiten, Startpunkte von zwei aufeinanderfolgenden Betriebsabschnitten beliebiger Induktionsheizeinheiten mit mindestens 50 ms, vorzugsweise mindestens 100 ms, zu beabstanden. Insbesondere beträgt ein Abstand zweier Startpunkte direkt aufeinanderfolgender Betriebsabschnitte beliebiger Induktionsheizeinheiten ein Vielfaches von 50 ms bzw. ein Vielfaches von 100 ms. Es kann insbesondere eine Überlastung von Schaltelementen, insbesondere Relais, vermieden werden.It is proposed according to the invention that the control unit is provided, at least in an operating mode with section-wise operation of at least two induction heating units, starting points of two successive operating sections of any Induktionsheizeinheiten with at least 50 ms, preferably at least 100 ms to space. In particular, 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. In particular, an overload of switching elements, in particular relays, can be avoided.
Vorzugsweise ist die Steuereinheit dazu vorgesehen, zumindest in einem Betriebsmodus mit abschnittsweisem Betrieb von zumindest zwei Induktionsheizeinheiten, aufeinanderfolgende Startpunkte von zumindest zwei, insbesondere zumindest fünf, vorteilhaft zumindest zehn und vorzugsweise von allen aufeinanderfolgenden Betriebsabschnitten einer Induktionsheizeinheit mit maximal 7 s, insbesondere maximal 5 s, vorteilhaft maximal 3 s und vorzugsweise maximal 2 s, zu beabstanden. Es kann insbesondere eine Komfortsteigerung erreicht werden, da Hitze zeitlich gleichmäßig erzeugt wird.Preferably, the control unit is provided, at least in an operating mode with section-wise 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, advantageously a maximum of 3 s, and preferably a maximum of 2 s, to space. In particular, an increase in comfort can be achieved since heat is generated evenly over time.
In einer alternativen Ausgestaltung wird vorgeschlagen, dass die Induktionsheizvorrichtung zumindest zwei Schaltelemente aufweist, die zwischen der Heizfrequenzeinheit und zumindest einer der Induktionsheizeinheiten angeordnet sind. Vorzugsweise sind die Schaltelemente Teil der Schaltanordnung und/oder unterscheiden sich von Schaltelementen einer Heizfrequenzeinheit. Vorzugsweise sind die Schaltelemente als ein- oder mehrpolige Wechselschalter ausgebildet. Darunter, dass die Schaltelemente "zwischen" der Heizfrequenzeinheit und der Induktionsheizeinheit angeordnet sind, soll insbesondere verstanden werden, dass in einem Betriebszustand, in dem die Induktionsheizeinheit mit hochfrequentem Wechselstrom versorgt wird, die Induktionsheizeinheit mit den Schaltmitteln in beliebiger Reihenfolge an einem einzelnen Kontakt, vorzugsweise einem Spannungsabgriff, der Heizfrequenzeinheit in Reihenschaltung angeordnet sind. Vorzugsweise ist in einem beliebigen Betriebszustand das erste Schaltelement mit der Heizfrequenzeinheit, mit dem ersten Schaltelement das zweite Schaltelement und mit dem zweiten Schaltelement die Induktionsheizeinheit direkt verbunden. Es kann insbesondere eine geringe Schalthäufigkeit und somit ein geringer Verschleiß der Schaltelemente erreicht werden.In an alternative embodiment, it is proposed that 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. Preferably, the switching elements are part of the switching arrangement and / or differ from switching elements of a heating frequency unit. Preferably, the switching elements are designed as single or multi-pole changeover switch. By arranging the switching elements "between" the heating frequency unit and the induction heating unit, it should be understood in particular 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. Preferably, in any operating state, the first switching element with the Heizfrequenzeinheit, with the first switching element, the second switching element and the second switching element, the induction heating directly connected. In particular, a low switching frequency and thus a low wear of the switching elements can be achieved.
Weitere Vorteile ergeben sich aus der folgenden Zeichnungsbeschreibung. In der Zeichnung sind Ausführungsbeispiele der Erfindung dargestellt. Die Zeichnung, die Beschreibung und die Ansprüche enthalten zahlreiche Merkmale in Kombination. Der Fachmann wird die Merkmale zweckmäßigerweise auch einzeln betrachten und zu sinnvollen weiteren Kombinationen zusammenfassen.Further advantages emerge from the following description of the drawing. In the drawings, embodiments of the invention are shown. The drawing, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.
Es zeigen:
- Fig. 1
- eine schematische Ansicht eines Induktionskochfelds in einer Ansicht von oben,
- Fig. 2
- eine schematische Ansicht einer ersten Variante einer erfindungsgemäßen Induktionsheizvorrichtung,
- Fig. 3
- eine schematische Ansicht einer zweiten Variante der Induktionsheizvorrichtung,
- Fig. 4
- eine schematische Ansicht einer dritten Variante der Induktionsheizvorrichtung mit einer alternativen Resonanzeinheit,
- Fig. 5
- eine schematische Ansicht einer vierten Variante der Induktionsheizvorrichtung in einer Ausführung als Vollbrückenschaltung,
- Fig. 6
- ein schematisches Diagramm eines möglichen Betriebsablaufs und
- Fig. 7
- einen Detailausschnitt des Diagramms in
Figur 6 .
- Fig. 1
- a schematic view of an induction hob in a view from above,
- Fig. 2
- a schematic view of a first variant of an induction heating device according to the invention,
- Fig. 3
- a schematic view of a second variant of the induction heating,
- Fig. 4
- FIG. 2 a schematic view of a third variant of the induction heating device with an alternative resonance unit, FIG.
- Fig. 5
- FIG. 2 is a schematic view of a fourth variant of the induction heating device in a design as a full bridge circuit, FIG.
- Fig. 6
- a schematic diagram of a possible operation and
- Fig. 7
- a detail of the diagram in
FIG. 6 ,
Diese Schaltung kann beliebig auf mehr als fünf Induktionsheizeinheiten ausgeweitet oder auf vier oder drei Induktionsheizeinheiten begrenzt werden. Auch sind Ausführungen denkbar, in denen kein zwei oder mehr als zwei der Induktionsheizeinheiten einen gemeinsamen Heizbereich bilden.This circuit can be arbitrarily extended to more than five induction heating units or limited to four or three induction heating units. Embodiments are also conceivable in which no two or more than two of the induction heating units form a common heating area.
In den
Die
In einer weiteren Ausgestaltung bilden die beiden Induktionsheizeinheiten 26b, 28b einen gemeinsamen Heizbereich 39b. In einer derartigen Ausgestaltung ist es denkbar, dass das vierte Schaltelement 46b der Schaltanordnung durch zwei Schaltelemente ersetzt ist, die als einpolige Einschalter ausgebildet sind. Zwei direkt miteinander verbundene erste Kontakte der beiden Schaltelemente würden an Stelle des ersten Kontakts des vierten Schaltelements 46b treten und die zweiten Kontakte der beiden Schaltelemente würden jeweils den zweiten bzw. dritten Kontakt des vierten Schaltelements 46b bilden. Weiterhin sind Abwandlungen der Schaltung mit nur drei oder vier oder mit mehr als fünf Induktionsheizeinheiten denkbar. In einer Ausführung mit vier Induktionsheizeinheiten 20b, 22b, 24b, 26b würde das vierte Schaltelement 46b und die fünfte Induktionsheizeinheit 28b entfallen und der erste Kontakt der vierten Induktionsheizeinheit 26b wäre direkt mit dem dritten Kontakt des dritten Schaltelements 44b verbunden. In einer Ausführung mit drei Induktionsheizeinheiten 20b, 22b, 24b würden das dritte und vierte Schaltelement 44b, 46b und die vierte und fünfte Induktionsheizeinheit 26b, 28b entfallen und der erste Kontakt der dritten Induktionsheizeinheit 24b wäre direkt mit dem dritten Kontakt des ersten Schaltelements 40b verbunden. Durch entsprechende Fortführung einer Kaskadierung der Schaltelemente 40b, 42b, 44b, 46b kann die Induktionsheizvorrichtung 12b auf eine beliebige Anzahl an Induktionsheizeinheiten erweitert werden.In a further embodiment, the two
In der
In einer alternativen Konfiguration weisen beliebige andere Anzahlen an Induktionsheizeinheiten jeweils einen gemeinsamen Kontakt auf, der entweder mit der ersten oder mit der zweiten Resonanzeinheit 50c, 51c verbunden werden kann. Auch sind Ausgestaltungen denkbar, in denen Gruppen von Induktionsheizeinheiten und/oder einzelne Induktionsheizeinheiten fest, also ohne zusätzliche Schaltelemente, mit den Resonanzeinheiten 50c, 51 c direkt verbunden sind. Auch sind Ausführungen mit mehr als zwei Resonanzeinheiten denkbar.In an alternative configuration, any other numbers of induction heating units each have a common contact that can be connected to either the first or the
In der
In weiteren Ausgestaltungen ist denkbar, dass analog
Generell können in den beschriebenen Schaltungen Relais, die als einpolige Einschalter ausgebildet sind, auch durch Halbleiterschalter, wie Transistoren, im Besonderen IGBTs, ersetzt sein. Des Weiteren kann ein gemeinsamer Kontakt der Induktionsheizeinheiten die ersten Kontakte der Induktionsheizeinheiten und den Spannungsabgriff der Heizfrequenzeinheit verbinden und eine Schaltanordnung ist mit den zweiten Kontakten der Induktionsheizeinheiten verbunden und ist dazu vorgesehen, eine direkte Verbindung zwischen zumindest einer der Induktionsheizeinheiten und zumindest einer der Resonanzeinheiten herzustellen.In general, in the described circuits, relays which are designed as single-pole power-on switches can also be replaced by semiconductor switches, such as transistors, in particular IGBTs. Furthermore, common contact of the induction heating units may 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 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.
In der
Alternativ ist die Steuereinheit in einer Anordnung, in der zwei Induktionsheizeinheiten einen gemeinsamen Heizbereich bilden und in der ein erster Kontakt der Induktionsheizeinheiten jeweils mit einem zweiten Kontakt eines ersten bzw. zweiten einpoligen Einschalters direkt verbunden ist und die ersten Kontakte des ersten und zweiten einpoligen Einschalters direkt miteinander verbunden sind, dazu vorgesehen, in einem Betriebsabschnitt, in dem für beide Induktionsheizeinheiten eine Leistung angefordert ist, die beiden Induktionsheizeinheiten in identischen Betriebsabschnitten zu betreiben.
Claims (8)
- Induction hob device having at least one heating frequency unit (60a; 60b; 60c; 60d, 61d) and having at least three induction heating units (20a, 22a, 24a, 26a, 28a; 20b, 22b, 24b, 26b, 28b; 20c, 22c, 24c, 26c; 20d, 22d, 24d, 26d) which are associated with the heating frequency unit (60a; 60b; 60c; 60d, 61d), wherein in each operating state in which one of the induction heating units (20a, 22a, 24a, 26a, 28a; 20b, 22b, 24b, 26b, 28b; 20c, 22c, 24c, 26c; 20d, 22d, 24d, 26d) is supplied with high-frequency alternating current, the heating frequency unit (60a; 60b; 60c; 60d, 61d) is directly connected to the induction heating unit (20a, 22a, 24a, 26a, 28a; 20b, 22b, 24b, 26b, 28b; 20c, 22c, 24c, 26c; 20d, 22d, 24d, 26d), and having at least one control unit (64a; 64b; 64c; 64d) which is at least provided to operate at least two of the induction heating units (20a, 22a, 24a, 26a, 28a; 20b, 22b, 24b, 26b, 28b; 20c, 22c, 24c, 26c; 20d, 22d, 24d, 26d) sectionally in at least one operating mode, characterised in that the control unit (64a; 64b; 64c; 64d) is provided, at least in one operating mode with sectional operation of at least two induction heating units (20a, 22a, 24a, 26a, 28a; 20b, 22b, 24b, 26b, 28b; 20c, 22c, 24c, 26c; 20d, 22d, 24d, 26d), to space apart starting points (102a, 106a, 110a, 114a) of two consecutive operating sections (100a, 104a, 108a, 112a) of any induction heating units (20a, 22a, 24a, 26a, 28a; 20b, 22b, 24b, 26b, 28b; 20c, 22c, 24c, 26c; 20d, 22d, 24d, 26d) by at least 50 ms.
- Induction hob device according to claim 1, characterised in that at least two of the induction heating units (20a, 22a, 24a, 26a, 28a; 20b, 22b, 24b, 26b, 28b; 20c, 22c, 24c, 26c; 20d, 22d, 24d, 26d) form a common heating area (39a, 39b).
- Induction hob device according to one of the preceding claims, characterised in that at least two of the induction heating units (20a, 22a, 24a, 26a, 28a; 20b, 22b, 24b, 26b, 28b; 20c, 22c, 24c, 26c; 20d, 22d, 24d, 26d) have a common contact (94a; 94b; 94c, 95c; 94d, 95d).
- Induction hob device according to claim 3, characterised by a resonance unit (50a; 50b; 50c, 51c; 50d, 51d) which in at least one operating state is directly connected to a common contact (94a; 94b; 94c, 95c; 94d, 95d).
- Induction hob device according to one of the preceding claims, characterised in that the control unit (64a; 64b; 64c; 64d) is provided, at least in one operating mode with sectional operation of at least two induction heating units (20a, 22a, 24a, 26a, 28a; 20b, 22b, 24b, 26b, 28b; 20c, 22c, 24c, 26c; 20d, 22d, 24d, 26d), to space apart starting points (102a, 114a) of at least two consecutive operating sections (100a, 112a) of an induction heating unit (20a, 22a, 24a, 26a, 28a; 20b, 22b, 24b, 26b, 28b; 20c, 22c, 24c, 26c; 20d, 22d, 24d, 26d) by a maximum of 7 s.
- Induction hob device according to one of the preceding claims, characterised by at least two switching elements (40b, 42b, 44b, 46b, 48b) which are arranged between the heating frequency unit (60b; 60c; 60d, 61d) and at least one of the induction heating units (20b, 22b, 24b, 26b, 28b; 20c, 22c, 24c, 26c; 20d, 22d, 24d, 26d).
- Induction hob having an induction hob device (12a; 12b; 12c; 12d) according to one of the preceding claims.
- Method for operating an induction hob device (12a; 12b; 12c; 12d) according to one of claims 1 to 6, wherein in at least one operating mode at least two of the induction heating units (20a, 22a, 24a, 26a, 28a; 20b, 22b, 24b, 26b, 28b; 20c, 22c, 24c, 26c; 20d, 22d, 24d, 26d) are operated sectionally by the control unit (64a; 64b; 64c; 64d), characterised in that at least in one operating mode with sectional operation of at least two induction heating units (20a, 22a, 24a, 26a, 28a; 20b, 22b, 24b, 26b, 28b; 20c, 22c, 24c, 26c; 20d, 22d, 24d, 26d), starting points (102a, 106a, 110a, 114a) of two consecutive operating sections (100a, 104a, 108a, 112a) of any induction heating units (20a, 22a, 24a, 26a, 28a; 20b, 22b, 24b, 26b, 28b; 20c, 22c, 24c, 26c; 20d, 22d, 24d, 26d) are spaced apart by the control unit (64a; 64b; 64c; 64d) by at least 50 ms.
Applications Claiming Priority (1)
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ES201130479 | 2011-03-29 |
Publications (4)
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EP2506667A2 EP2506667A2 (en) | 2012-10-03 |
EP2506667A3 EP2506667A3 (en) | 2013-01-23 |
EP2506667B1 true EP2506667B1 (en) | 2016-10-19 |
EP2506667B2 EP2506667B2 (en) | 2023-12-13 |
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EP12158709.1A Active EP2506667B2 (en) | 2011-03-29 | 2012-03-09 | Induction heating device |
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ES (1) | ES2606530T5 (en) |
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EP2744300B1 (en) * | 2012-12-11 | 2015-11-18 | BSH Hausgeräte GmbH | Induction heating device for household appliances |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0724379A1 (en) | 1995-01-25 | 1996-07-31 | MENEGHETTI Ampelio, STRAGLIOTTO Maria, MENEGHETTI Cesira, MENEGHETTI Tiziano dba MENEGHETTI AMPELIO & C. S.n.c. | Control device particularly for induction cooking ranges with multiple heating elements |
EP1951003A1 (en) | 2007-01-23 | 2008-07-30 | Whirlpool Corporation | Control method for induction cooking hob and induction cooking hob adapted to carry out such method |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006058874A1 (en) * | 2006-12-06 | 2008-06-19 | E.G.O. Elektro-Gerätebau GmbH | Method for controlling induction heating devices in an electric cooking appliance |
ES2330496B1 (en) * | 2007-10-31 | 2010-09-08 | Bsh Electrodomesticos España, S.A. | COOKING DEVICE. |
ES2353890B1 (en) * | 2008-12-19 | 2012-01-26 | Bsh Electrodomesticos España, S.A. | COOKING FIELD WITH AT LEAST THREE WARMING AREAS. |
-
2012
- 2012-03-09 ES ES12158709T patent/ES2606530T5/en active Active
- 2012-03-09 EP EP12158709.1A patent/EP2506667B2/en active Active
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0724379A1 (en) | 1995-01-25 | 1996-07-31 | MENEGHETTI Ampelio, STRAGLIOTTO Maria, MENEGHETTI Cesira, MENEGHETTI Tiziano dba MENEGHETTI AMPELIO & C. S.n.c. | Control device particularly for induction cooking ranges with multiple heating elements |
EP1951003A1 (en) | 2007-01-23 | 2008-07-30 | Whirlpool Corporation | Control method for induction cooking hob and induction cooking hob adapted to carry out such method |
Non-Patent Citations (1)
Title |
---|
"Electromagnetic compatibility (EMC) - Part 3-3", IEC INTERNATIONAL STANDARD 61000-3-3 (EDITION 1.1), March 2002 (2002-03-01), XP055401968 |
Also Published As
Publication number | Publication date |
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ES2606530T5 (en) | 2024-06-27 |
EP2506667B2 (en) | 2023-12-13 |
EP2506667A2 (en) | 2012-10-03 |
ES2606530T3 (en) | 2017-03-24 |
EP2506667A3 (en) | 2013-01-23 |
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