EP4013191A1 - Induction cooking appliance - Google Patents

Abstract

The invention is based on an induction cooking device (10a-d), in particular an induction hob device, with an inverter unit (12a-d) which has at least three inverter switching elements (14a-d, 16a-d, 18a-d, 82b-d , 88c), and with a snubber unit (20a-d) assigned to the inverter unit (12a-d), which has a plurality of snubber capacitors (22a-d, 24a-d, 26a-d, 28a-d, 84b -d, 86b-c, 90c, 92c).

In order to provide generic devices with improved properties in terms of efficiency, it is proposed that at least one of the snubber capacitors (22a-d, 24a-d, 26a-d, 28a-d, 84b-d, 86b-c, 90c, 92c) be electrically is arranged in parallel with exactly two inverter switching elements (14a-d, 16a-d, 18a-d; 82b-d, 88c) of the inverter unit (12a-d).

Description

The invention relates to an induction cooking device according to the preamble of claim 1.

Induction cooktops with inverters are already known from the prior art, which have three or more inverter switching elements electrically connected in series with one another for driving two or more inductors. In such inverter circuit arrangements, a number of inverter switching elements can be reduced compared to full or half-bridge topologies that are customarily used in the field of induction cooktops. An induction hob with three or more mutually electrically connected in series inverter switching elements for driving two or more inductors is, for example, from EP 3 110 232 A1 known. The induction hob has exactly one snubber capacitor for each inverter switching element, which is arranged in parallel with the respective inverter switching element, which disadvantageously has a capacitance of individual snubber capacitors to reduce switching losses of the inverter switching elements, which are used to simultaneously control two inductors, not specifically can be designed for the requirements for the operation of a single inductor, which means, especially in the case of inductors with different electromagnetic properties, for example different inductances, that the switching losses cannot be optimally reduced in all operating modes and, in particular, are increased when several inductors are operated at the same time switching losses occur. In addition, at least in some operating modes, there is the disadvantage that charging and/or discharging of individual snubber capacitors takes place directly via the inverter switching elements, which disadvantageously increases the generation of high-frequency interference signals and thus reduces electromagnetic compatibility.

The object of the invention consists in particular, but not limited thereto, in providing a generic device with improved properties in terms of efficiency. The object is achieved according to the invention by the features of claim 1, while advantageous refinements and developments of the invention can be found in the dependent claims.

The invention is based on an induction cooking appliance device, in particular an induction hob device, with an inverter unit which has at least three inverter switching elements arranged electrically in series with one another, and with a snubber unit which is assigned to the inverter unit and has a plurality of snubber capacitors.

It is proposed that at least one of the snubber capacitors is arranged electrically in parallel with exactly two inverter switching elements of the inverter unit.

Such a configuration can advantageously provide an induction cooking appliance device with improved properties in terms of efficiency. In particular, switching losses that occur when switching the inverter switching elements can advantageously be reduced, preferably minimized, as a result of which particularly high energy efficiency can be achieved. Furthermore, when changing operating modes, for example when changing from operation with a single independent inductor to operation with several independent inductors, the snubber unit can advantageously be used to reduce a load on the inverter switching elements, which advantageously provides a particularly low-wear and durable induction cooking appliance device can. The configuration of the snubber unit can also advantageously increase flexibility in the design of the capacitances of individual snubber capacitors. As a result, a reduction in switching losses when switching the inverter switching elements can be optimized independently of a number of independent inductors being operated at the same time. In addition, an arrangement of the snubber capacitors can advantageously be achieved which enables the inverter switching elements to be controlled in all operating modes in such a way that direct charging and/or discharging of the snubber capacitors via one or more inverter switching elements is prevented, which advantageously prevents the occurrence of high-frequency interference signals reduced and thus improved electromagnetic compatibility can be achieved. Since the inverter unit has at least three inverter switching elements arranged electrically in series, compared to conventional circuit arrangements with inverter switching elements in a full or half-bridge circuit, at least one inverter switching element can advantageously be saved with the same number of inductors to be operated. which also advantageously results in a saving of space on a printed circuit board that is used. Thus, cost efficiency can advantageously be increased.

An "induction cooking device", in particular an "induction oven device", should be understood to mean at least a part, in particular a subassembly, of an induction cooking device. An induction cooking appliance having the induction cooking appliance device could be designed, for example, as an induction grill and/or as an induction oven and/or as a combination appliance with an additional microwave function. An induction cooking device having the induction cooking device is preferably designed as an induction hob. The induction cooking appliance device is preferably an induction hob device. It is conceivable that the induction hob is designed as a matrix induction hob. The induction cooking appliance device, in particular the induction hob device, can also include the entire induction cooking appliance, in particular the entire induction hob.

The induction cooking device has at least two independent inductors, each of which includes at least one induction coil and is intended to supply energy, in particular in the form of an alternating magnetic field, to at least one receiving element, for example a cooking utensil, for heating purposes. An "independent" inductor should be understood to mean an inductor which can be operated independently of other independent inductors of the induction cooking appliance device. A heating output provided by an independent inductor in an operating state can be set independently of a heating output of one or more other independent inductors of the induction cooking appliance device. For example, several induction coils connected directly to one another in series should not be understood as a plurality of independent inductors within the meaning of the present application, since they cannot be operated independently of one another. However, a plurality of induction coils connected directly to one another in series can jointly form an independent inductor, which in turn can then be operated independently of at least one further independent inductor of the induction cooking appliance device.

The inverter unit is intended to provide, in at least one operating state, an alternating current, in particular a high-frequency, alternating current for driving and supplying energy to at least one independent inductor. The inverter unit has at least the three inverter switching elements arranged electrically in series with one another and can also have further inverter switching elements which are preferably arranged electrically in series with the at least three inverter switching elements. An inverter switching element has at least one control contact via which it can be controlled, in particular by a control unit. The inverter switching element is advantageously in the form of a semiconductor switching element, for example a TRIAC, preferably a transistor, for example a FET, a MOSFET, a JFET or a HEMT transistor. The inverter switching element is preferably designed as a bipolar transistor, in particular with an insulated gate electrode (IGBT). Alternatively, the inverter switching element can be designed as a mechanical and/or electromechanical switching element, in particular as a relay. Each inverter switching element preferably has a freewheeling diode, so that a bidirectional current flow through the inverter switching element is made possible.

The snubber unit is assigned to the inverter unit and is intended to limit a voltage rise rate when the inverter switching elements are switched and thus to reduce, preferably minimize, the switching losses that occur when the inverter switching elements are switched. In addition, the snubber unit is provided in particular to protect the inverter switching elements against overvoltages. Furthermore, the snubber unit is intended in particular to neutralize interfering high-frequency signals and to contribute to achieving improved electromagnetic compatibility of the induction cooking appliance device. The snubber unit has the plurality of snubber capacitors and can also have further elements, for example electrical resistors and/or switches. The snubber unit preferably has a plurality of at least four snubber capacitors. Each of the snubber capacitors of the snubber unit is preferably directly electrically conductively connected to at least one connection of one of the inverter switching elements of the inverter unit. A snubber capacitor differs from other capacitors in the induction cooking device, in particular from a BUS capacitor and/or from a resonance capacitor, which forms an electromagnetic resonant circuit with at least one of the independent inductors, and/or from other capacitors that may be present in the induction cooking device, at least with regard to its arrangement and function in relation to at least one of the inverter switching elements the inverter unit. The snubber capacitors of the snubber unit can, at least in part, have different electrical capacitances among one another. An electrical capacitance of a snubber capacitor is preferably specifically tailored to the electromagnetic properties, for example an inductance and/or a maximum current flow, of the respective independent inductor which is operated by the inverter switching element to which the snubber capacitor is directly electrically conductively connected , designed. The expression "directly electrically conductively connected" should preferably be understood to mean that an element is connected directly to a further element via an electrically conductive connection, without further electrical and/or electronic components connected in between.

"Provided" is intended to mean specifically programmed, designed, and/or equipped. The fact that an object is provided for a specific function should preferably be understood to mean that the object fulfills and/or executes this specific function in at least one application and/or operating state.

In addition, it is proposed that a total number of snubber capacitors in the snubber unit exceeds a total number of inverter switching elements in the inverter unit by at least one. A configuration of this type can advantageously be used to achieve a circuit arrangement of the snubber capacitors, which enables the switching losses of the inverter switching elements to be reduced by the snubber unit, using simple technical means. The total number of snubber capacitors of the snubber unit can exceed the total number of inverter switching elements of the inverter unit by exactly one. For example, a total number of snubber capacitors is exactly four in the case of an inverter unit with exactly three inverter switching elements electrically connected in series with one another.

Furthermore, it is proposed that at least two of the snubber capacitors are arranged electrically in parallel with exactly two inverter switching elements of the inverter unit. As a result, a circuit arrangement of the snubber capacitors can advantageously be further improved and the efficiency of the induction cooking appliance device can thus be increased. Furthermore, flexibility can advantageously be increased since the capacitances of individual snubber capacitors for each operating mode, ie both when operating an individual independent inductor and when operating at the same time Operation of several independent inductors, can be designed completely freely and independently of the capacities of other snubber capacitors, whereby a reduction in switching losses can be optimized for all operating modes of the induction cooking device device. A first snubber capacitor is preferably arranged electrically in parallel with exactly one first inverter switching element and exactly one second inverter switching element, and a second snubber capacitor is arranged electrically in parallel with exactly the second inverter switching element and exactly one third inverter switching element.

Furthermore, it is proposed that a snubber capacitor arranged electrically in parallel with precisely two inverter switching elements is electrically conductively connected to a collector of a first inverter switching element and to an emitter of a second inverter switching element. A configuration of this type advantageously makes it possible to achieve a simple circuit arrangement for the first of the at least two snubber capacitors which are arranged electrically in parallel with exactly two inverter switching elements. In addition, it is proposed that a snubber capacitor arranged electrically in parallel with precisely two inverter switching elements is electrically conductively connected to a collector of a second inverter switching element and to an emitter of a third inverter switching element. In this way, a particularly simple circuit arrangement of the second of the at least two snubber capacitors arranged electrically in parallel with precisely two inverter switching elements can advantageously be achieved. The second snubber capacitor is also electrically conductively connected to the emitter of the first inverter switching element.

In addition, it is proposed that the induction cooking appliance device has at least two BUS lines for supplying energy to the inverter unit, with each snubber capacitor being electrically conductively connected directly to at least one of the BUS lines. If each snubber capacitor is electrically conductively connected directly to at least one of the BUS lines, it can be advantageously achieved that the snubber capacitors are always charged and/or discharged directly via one of the at least two BUS lines and in all operating modes of the induction cooking appliance device does not take place via one of the inverter switching elements, resulting in the occurrence of high-frequency interference signals during charging and / or discharging the Snubber capacitors are reduced and electromagnetic compatibility of the induction cooking appliance device can be improved. Each snubber capacitor is preferably directly electrically conductively connected to precisely one of the BUS lines. When the induction cooking device is in an operating state, a DC voltage provided by a rectifier unit for supplying energy to the inverter unit is present on at least one of the BUS lines. The rectifier unit can be part of the induction cooking device or part of an induction cooking device having the induction cooking device.

Furthermore, it is proposed that exactly two of the snubber capacitors are arranged electrically in parallel with exactly one of the inverter switching elements in each case. A configuration of this type can advantageously further improve a circuit arrangement of the snubber capacitors and advantageously increase efficiency. Preferably, exactly one snubber capacitor is electrically parallel to the inverter switching element, which is directly electrically conductively connected to a first of the at least two BUS lines, and exactly one snubber capacitor is electrically parallel to the inverter switching element, which is directly electrically conductively connected to a second of the at least two BUS lines are connected.

Furthermore, it is proposed that the induction cooking appliance device has a plurality of independent inductors which can be operated with the inverter unit. Such a configuration can advantageously provide a particularly efficient induction cooking appliance device with a high degree of flexibility and ease of use for users. The inverter unit preferably has a total number of inverter switching elements arranged in series with one another which exceeds the total number of independent inductors by exactly one. The induction cooking device has a plurality of at least two independent inductors and can also have a larger number of independent inductors, for example at least three or at least four or at least five or more independent inductors.

Furthermore, it is proposed that the total number of snubber capacitors of the snubber unit is at least two larger than a total number of the independent inductors. Such a design allows an induction cooking device to be provided with a high degree of efficiency. In an advantageous design, the total number of snubber capacitors is exactly two greater than the total number of independent inductors. As a result, the number of snubber capacitors required can advantageously be minimized and cost efficiency increased.

In addition, it is proposed that the total number of snubber capacitors of the snubber unit is twice a total number of the independent inductors. As a result, the energy efficiency of the induction cooking appliance device can advantageously be increased. In particular, in the case of induction cooking devices with a total number of independent inductors that is greater than two, switching losses of the inverter switching elements can be particularly greatly reduced, preferably minimized, if the total number of snubber capacitors of the snubber unit is twice the total number of independent inductors is equivalent to. In addition, in the case of induction cooking appliance devices with a total number of independent inductors that is greater than two, all operating modes can advantageously enable the inverter switching elements to be activated, in which direct charging and/or discharging of the snubber capacitors via one or more inverter switching elements is prevented , which advantageously reduces the occurrence of high-frequency interference signals and thus improved electromagnetic compatibility can be achieved.

The invention also relates to an induction cooking appliance with at least one induction cooking appliance according to one of the configurations described above. Such an induction cooking appliance is characterized in particular by a high degree of efficiency, which is achieved by the configurations of the induction cooking appliance device described above.

The induction cooking device should not be limited to the application and embodiment described above. In particular, the induction cooking appliance device can have a number of individual elements, components and units that differs from a number specified here in order to fulfill a function described herein.

Further advantages result from the following description of the drawings. Four exemplary embodiments of the invention are shown in the drawing. 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 further meaningful combinations.

Fig. 1

ein Induktionsgargerät mit einer Induktionsgargerätevorrichtung in einer schematischen Ansicht,

Fig. 2

ein schematisches elektrisches Schaltbild der Induktionsgargerätevor-richtung,

Fig. 3

ein schematisches Diagramm zur Darstellung der Funktionsweise der Induktionsgargerätevorrichtung,

Fig. 4

ein schematisches elektrisches Schaltbild eines weiteren Ausführungs-beispiels einer Induktionsgargerätevorrichtung,

Fig. 5

ein schematisches elektrisches Schaltbild eines weiteren Ausführungs-beispiels einer Induktionsgargerätevorrichtung und

Fig. 6

ein schematisches elektrisches Schaltbild eines weiteren Ausführungs-beispiels einer Induktionsgargerätevorrichtung.

Show it:

1

an induction cooking appliance with an induction cooking appliance device in a schematic view,

2

a schematic electrical circuit diagram of the induction cooking device device,

3

a schematic diagram to show how the induction cooking device works,

4

a schematic electrical circuit diagram of a further exemplary embodiment of an induction cooking appliance device,

figure 5

a schematic electrical circuit diagram of a further exemplary embodiment of an induction cooking appliance device and

6

a schematic electrical circuit diagram of a further exemplary embodiment of an induction cooking appliance device.

figure 1 shows an induction cooking appliance 50a in a schematic view. The induction cooking appliance 50a is designed as an induction hob. The induction cooking appliance 50a has at least one induction cooking appliance device 10a. The induction cooking appliance device 10a is designed as an induction hob device. The induction cooking appliance device 10a comprises a plurality of independent inductors. In the present case, the induction cooking appliance device 10a comprises a plurality of two independent inductors, namely an independent inductor 42a and an independent inductor 44a. The independent inductors 42a, 44a are each intended to provide energy in the form of an alternating electromagnetic field for the purpose of heating to at least one receiving element (not shown), for example a cooking utensil (not shown) placed on a hob plate 52a of the induction cooking appliance 50a designed as an induction hob .

figure 2 shows a schematic electrical circuit diagram of the induction cooking appliance device 10a. The induction cooking appliance device 10a has an inverter unit 12a. The inverter unit 12a comprises at least three, in the present case exactly three, to one another inverter switching elements electrically connected in series, namely a first inverter switching element 14a, a second inverter switching element 16a and a third inverter switching element 18a. The inverter switching elements 14a, 16a, 18a are each formed as semiconductor switching elements, namely insulated gate bipolar transistors (IGBT). The inverter switching elements 14a, 16a, 18a are provided for driving and supplying energy to the independent inductors 42a, 44a. The independent inductors 42a, 44a can be operated independently of one another by means of the inverter unit 12a. The first inverter switching element 14a has a first freewheeling diode 72a, the second inverter switching element 16a has a second freewheeling diode 74a and the third inverter switching element 18a has a third freewheeling diode 76a.

The induction cooking appliance device 10a has a plurality of resonance capacitors 94a, 96a, 98a, 100a. In an operating state of the independent inductor 42a, a first resonant capacitor 94a and another first resonant capacitor 96a form a resonant circuit with the independent inductor 42a. In an operating state of the independent inductor 44a, a second resonant capacitor 98a and another second resonant capacitor 100a form a resonant circuit with the independent inductor 44a.

The induction cooking appliance device 10a has a snubber unit 20a, which is assigned to the inverter unit 12a. The snubber unit 20a has a plurality of snubber capacitors, namely a first snubber capacitor 22a, a second snubber capacitor 24a, a third snubber capacitor 26a and a fourth snubber capacitor 28a. A total number of the snubber capacitors 22a, 24a, 26a, 28a exceeds a total number of the inverter switching elements 14a, 16a, 18a by at least one. The total number of snubber capacitors 22a, 24a, 26a, 28a is greater than a total number of independent inductors 42a, 44a by at least two. Here, the total number of snubber capacitors 22a, 24a, 26a, 28a is twice the total number of independent inductors 42a, 44a.

At least one of the snubber capacitors 22a, 24a, 26a, 28a is arranged electrically in parallel with exactly two inverter switching elements 14a, 16a, 18a. There are at least two, and precisely two, of the snubber capacitors 22a, 24a, 26a, 28a arranged electrically in parallel with exactly two inverter switching elements 14a, 16a, 18a. The first snubber capacitor 22a is arranged electrically in parallel with the first inverter switching element 14a and electrically in parallel with the second inverter switching element 16a. The third snubber capacitor 26a is electrically conductively connected to a collector 30a of the first inverter switching element 14a and to an emitter 32a of the second inverter switching element 16a. The second snubber capacitor 24a is arranged electrically in parallel with the second inverter switching element 16a and electrically in parallel with the third inverter switching element 18a. The second snubber capacitor 24a is electrically conductively connected to a collector 34a of the second inverter switching element 16a and electrically conductively connected to an emitter 36a of the third inverter switching element 18a.

Exactly two of the snubber capacitors 22a, 24a, 26a, 28a are arranged electrically in parallel with exactly one of the inverter switching elements 14a, 16a, 18a in each case. The third snubber capacitor 16a is electrically arranged in parallel with the first inverter switching element 16a. The fourth snubber capacitor 28a is electrically arranged in parallel with the third inverter switching element 18a.

The first snubber capacitor 22a and the fourth snubber capacitor 28a are provided to reduce switching losses of the inverter unit 12a when the independent inductor 42a is operating. A capacitance of the snubber unit 20a provided when the independent inductor 42a is operated individually to reduce switching losses corresponds to the sum of the capacitances of the first snubber capacitor 22a and the fourth snubber capacitor 28a. The second snubber capacitor 24a and the third snubber capacitor 26a are provided to reduce switching losses of the inverter unit 12a when the independent inductor 44a is operating. A capacitance of the snubber unit 20a provided when the independent inductor 44a is operated individually to reduce switching losses corresponds to the sum of the capacitances of the second snubber capacitor 24a and the third snubber capacitor 26a. If the independent inductor 42a and the independent inductor 44a are operated simultaneously, the capacitance of the snubber unit 20a provided to reduce switching losses corresponds to the sum of all snubber capacitors 22a, 24a, 26a, 28a.

The induction cooking appliance device 10a has a rectifier unit 54a, which is intended to rectify an alternating current provided by a power supply network (not shown). The inverter unit 12a is connected to the rectifier unit 54a via two BUS lines, namely via a first BUS line 46a and via a second BUS line 48a. The first BUS line 46a is connected to the second BUS line 48a via a BUS capacitor 40a arranged electrically in parallel with the rectifier unit 54a.

Each of the snubber capacitors 22a, 24a, 26a, 28a is connected to at least one of the BUS lines 46a, 48a, respectively. In the present case, the first snubber capacitor 22a and the fourth snubber capacitor 28a are directly connected to the first BUS line 46a, and the second snubber capacitor 24 and the third snubber capacitor 26a are each directly connected to the second BUS line 48a.

figure 3 shows a schematic diagram to show how the induction cooking appliance device 10a works. The diagram shows an example of operation of the independent inductor 42a during a period 56a. With regard to the components of the induction cooking device 10a, refer to the schematic electrical circuit diagram of FIG figure 2 referred. A current intensity is plotted on an ordinate 102a of the diagram. A time is plotted on an abscissa 104a of the diagram. A curve 58a shows a waveform of a current flowing through the independent inductor 42a. During a first portion 60a of the period duration 56a, the first inverter switching element 14a is on and provides a current of an electrically positive polarity to the independent inductor 42a. A switched-on state of the first inverter switching element 14a is illustrated in the diagram by a first line 106a. During the first portion 60a, the second inverter switching element 16a is off and the third inverter switching element 18a is on. During the first portion 60a, the second snubber capacitor 24a is charged and the fourth snubber capacitor 28a is discharged.

During a subsequent second section 62a of the period duration 56a, the first inverter switching element 14a is switched off and the fourth snubber capacitor 28a is charged via the first BUS line 46a. The second snubber capacitor 24a is discharged during the second portion 62a, with a discharge current flowing through the independent inductor 42a.

During a third portion 64a, the second inverter switching element 16a is on and a current flows through the third freewheeling diode 76a of the third inverter switching element 18a and through the second freewheeling diode 74a of the second inverter switching element 16a to the independent inductor 42a. A switched-on state of the second inverter switching element 16a is illustrated in the diagram by a second line 108a.

In a fourth section 66a of the period 56a, the independent inductor 42a is supplied with a current of an electrically negative polarity, which flows from the second BUS line 48a via the switched-on third inverter switching element 18a and via the switched-on second inverter switching element 16a and to the independent inductor 42a .

During a fifth section 68a of the period duration 56a, the second inverter switching element 18a is switched off. During the fifth portion 68a, the fourth snubber capacitor 28a is discharged and the second snubber capacitor 24a is charged.

In a last sixth section 70a of the period duration 56a, the first inverter switching element 14a is switched on and the independent inductor 42a is supplied with current of electrically negative polarity via the first freewheeling diode 72a. During the sixth portion 70a, the fourth snubber capacitor 28a is fully discharged and the second snubber capacitor 24a is fully charged. The third inverter switching element 18a is switched on during the entire period duration 56a, which is illustrated in the diagram by a third line 110a. After the end of the sixth section 70a, the processes described above are repeated again.

In the Figures 4 to 6 three further exemplary embodiments of the invention are shown. The following descriptions are essentially limited to the differences between the exemplary embodiments, with regard to the same components, features and functions on the description of the exemplary embodiment Figures 1 to 3 can be referred. To distinguish between the exemplary embodiments, the letter a is in the reference numerals of the exemplary embodiment in FIGS Figures 1 to 3 by the letters b to d in the reference numerals of the embodiments of FIG Figures 4 to 6 replaced. With regard to components with the same designation, in particular with regard to components with same reference numerals, can in principle also refer to the drawings and / or the description of the embodiment of Figures 1 to 3 to get expelled.

The in the Figures 4 to 6 illustrated embodiments differ from the embodiment of FIG Figures 1 to 3 essentially with regard to a number of components used, with regard to the basic functioning of the above description of Figures 1 to 3 can be referred.

figure 4 shows a further exemplary embodiment in the form of a schematic electrical circuit diagram of an induction cooking appliance device 10b. In contrast to the induction cooking device 10a, the induction cooking device 10b has a higher number of independent inductors and accordingly also a higher number of inverter switching elements and snubber capacitors. The induction cooking appliance device 10b has a plurality of a total of three independent inductors, namely an independent inductor 42b, an independent inductor 44b and an independent inductor 78b. The induction cooking appliance device 10b has an inverter unit 12b with a total of four inverter switching elements 14b, 16b, 18b, 82b electrically connected in series with one another. The induction cooking appliance device 10b has a snubber unit 20b with a total of six snubber capacitors 22b, 24b, 26b, 28b, 84b, 86b. The total number of snubber capacitors 22b, 24b, 26b, 28b, 84b, 86b of the snubber unit 20b is greater than a total number of the independent inductors 42b, 44b, 78b by at least two. Here, the total number of snubber capacitors 22b, 24b, 26b, 28b, 84b, 86b of the snubber unit 20b is twice the total number of independent inductors 42b, 44b, 78b. With regard to the mode of operation of the induction cooking device 10b, reference can otherwise be made to the above description of the induction cooking device 10a.

figure 5 shows a further exemplary embodiment of an induction cooking appliance device 10c in a schematic electrical circuit diagram. In contrast to the induction cooking device 10b, the induction cooking device 10c has an even higher number of independent inductors and accordingly also an even higher number of inverter switching elements and snubber capacitors. The induction cooking appliance device 10b has a plurality of a total of four independent inductors, namely an independent inductor 42c, an independent inductor 44c, an independent inductor 78c and an independent inductor 80c. The induction cooking appliance device 10c has an inverter unit 12c with a total of five inverter switching elements 14c, 16c, 18c, 82c, 88c electrically connected in series with one another. The induction cooking appliance device 10c has a snubber unit 20c with a total of eight snubber capacitors 22c, 24c, 26c, 28c, 84c, 86c, 90c, 92c. The total number of snubber capacitors 22c, 24c, 26c, 28c, 84c, 86c, 90c, 92c of the snubber unit 20c is greater than a total number of the independent inductors 42c, 44c, 78c, 80c by at least two. Here, the total number of snubber capacitors 22c, 24c, 26c, 28c, 84c, 86c, 90c, 92c of the snubber unit 20c is twice the total number of independent inductors 42c, 44c, 78c, 80c. With regard to the mode of operation of the induction cooking device 10c, reference can otherwise be made to the above description of the induction cooking device 10a.

figure 6 shows a further exemplary embodiment of an induction cooking appliance device 10d in a schematic electrical circuit diagram. The induction cooking appliance device 10d has a plurality of a total of three independent inductors, namely an independent inductor 42d, an independent inductor 44d and an independent inductor 78d. The induction cooking appliance device 10d has an inverter unit 12d with a total of four inverter switching elements 14d, 16d, 18d, 82d electrically connected in series with one another. In contrast to the exemplary embodiment of the induction cooking appliance device 10b according to FIG figure 4 , the induction cooking appliance device 10d has a snubber unit 20d with a smaller total of five snubber capacitors 22d, 24d, 26d, 28d, 84d. The induction cooking appliance device 10d has at least two BUS lines 46d, 48d for supplying energy to the inverter unit 12d. In contrast to the previous exemplary embodiments, not all snubber capacitors 22d, 24d, 26d, 28d, 84d are directly electrically conductively connected to one of the BUS lines 46d, 48d. The fifth snubber capacitor 84d is different from that in FIG figure 4 The exemplary embodiment shown is not directly connected to one of the BUS lines 46d, 48d, so that in some operating states of the induction cooking appliance device 10d the fifth snubber capacitor 84d is charged and/or discharged via the first inverter switching element 14d or via the fourth inverter switching element 82d.

Reference sign

10

induction cooking device

12

inverter unit

14

first inverter switching element

16

second inverter switching element

18

third inverter switching element

20

snubber unit

22

first snubber capacitor

24

second snubber capacitor

26

third snubber capacitor

28

fourth snubber capacitor

30

collector

32

emitter

34

collector

36

emitter

40

BUS capacitor

42

independent inductor

44

independent inductor

46

first BUS line

48

second BUS line

50

induction cooker

52

hob plate

54

rectifier unit

56

period duration

58

Curve

60

first section

62

second part

64

third section

66

fourth section

68

fifth section

70

sixth section

72

first freewheeling diode

74

second freewheeling diode

76

third freewheeling diode

78

independent inductor

80

independent inductor

82

fourth inverter switching element

84

fifth snubber capacitor

86

sixth snubber capacitor

88

fifth inverter switching element

90

seventh snubber capacitor

92

eighth snubber capacitor

94

first resonant capacitor

96

another first resonant capacitor

98

second resonant capacitor

100

another second resonant capacitor

102

ordinate

104

abscissa

106

first line

108

second line

110

third line

Claims (11)

Induction cooking appliance device (10a-d), in particular induction hob device, with an inverter unit (12a-d) which has at least three inverter switching elements (14a-d, 16a-d, 18a-d, 82b-d, 88c) arranged electrically in series with one another , and with a snubber unit (20a-d) assigned to the inverter unit (12a-d) and having a plurality of snubber capacitors (22a-d, 24a-d, 26a-d, 28a-d, 84b-d, 86b -c, 90c, 92c), characterized in that at least one of the snubber capacitors (22a-d, 24a-d, 26a-d, 28a-d, 84b-d, 86b-c, 90c, 92c) is electrically in parallel is arranged to exactly two inverter switching elements (14a-d, 16a-d, 18a-d, 82b-d, 88c) of the inverter unit (12a-d). Induction cooking appliance device (10a-d) according to claim 1, characterized in that a total number of snubber capacitors (22a-d, 24a-d, 26a-d, 28a-d, 84b-d, 86b-c, 90c, 92c) of Snubber unit (20a-d) exceeds a total number of inverter switching elements (14a-d, 16a-d, 18a-d, 82b-d, 88c) of the inverter unit (12a-d) by at least one. Induction cooking appliance device (10a-d) according to Claim 1 or 2, characterized in that at least two of the snubber capacitors (22a-d, 24a-d, 26a-d, 28a-d, 84b-d, 86b-c, 90c, 92c ) are arranged electrically in parallel with exactly two inverter switching elements (14a-d, 16a-d, 18a-d, 82b-d, 88c) of the inverter unit (12a-d). Induction cooking appliance device (10a-d) according to Claim 3, characterized in that a snubber capacitor (26a; 22b; 90c; 22d) arranged electrically in parallel with exactly two inverter switching elements (14a-d, 16a-d) is electrically conductive with a collector (30a -d) a first inverter switching element (14a-d) and is connected to an emitter (32a-d) of a second inverter switching element (16a-d). Induction cooking appliance device (10a; 10d) according to Claim 3 or 4, characterized in that a snubber capacitor (24a, 84d) arranged electrically in parallel with exactly two inverter switching elements (16a 18a; 16d; 18d) is electrically conductive with a collector (34a; 34d) a second inverter switching element (16a; 16d) and to an emitter (36a; 36d) of a third inverter switching element (18a; 18d). Induction cooking appliance device (10a-c) according to one of the preceding claims, characterized by at least two BUS lines (46a-c, 48a-c) for supplying energy to the inverter unit (12a-c), each snubber capacitor (22a-c, 24a- c, 26a-c, 28a-c, 84b-c; 86b-c, 90c, 92c) is directly electrically conductively connected to at least one of the BUS lines (46a-c, 48a-c). Induction cooking appliance device (10a-d) according to one of the preceding claims, characterized in that exactly two of the snubber capacitors (22a, 28a; 28b, 86b; 26c, 28c; 26d, 28d) are electrically connected in parallel to exactly one of the inverter switching elements (14a, 18a; 14b, 82b; 14c, 88c; 14d, 82d). Induction cooking appliance device (10a-d) according to one of the preceding claims, characterized by a plurality of independent inductors (42a-d, 44a-d, 78b-d, 80c) which can be operated with the inverter unit (12a-d). Induction cooking device device (10a-d) according to claim 8, characterized in that the total number of snubber capacitors (22a-d, 24a-d, 26a-d, 28a-d, 84b-d, 86b-c, 90c, 92c) of Snubber unit (20a-d) is at least two larger than a total number of the independent inductors (42a-d, 44a-d, 78b-d, 80c). Induction cooking appliance device (10a-c) according to Claim 8 or 9, characterized in that the total number of snubber capacitors (22a-c, 24a-c, 26a-c, 28a-c, 84b-c, 86b-c, 90c, 92c ) of the snubber unit (20a-c) corresponds to twice a total number of the independent inductors (42a-c, 44a-c, 78b-c, 80c). Induction cooking appliance (50a) with at least one induction cooking appliance device (10a-d) according to one of the preceding claims.

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