WO2016071803A1 - Cooking appliance - Google Patents

Abstract

The aim of the invention is to provide a generic cooking appliance which has improved properties with regard to its efficiency. To achieve this, a cooking appliance (10), in particular a hob device, comprises: a first, a second, a third and a fourth switching unit (12, 14, 16, 18), each having a switching element (20, 22, 24, 26) and a diode (28, 30, 32, 34) connected in parallel to the switching element (20, 22, 24, 26) and which together are designed to rectify an AC voltage; and a control unit (38) which is designed to induce, in at least one operating state, the switching elements (20, 22) of the first and of the second switching unit (12, 14) to generate a HF heating current (68).

Description

 Gargerätevorrichtung

The invention relates to a Gargerätevorrichtung according to claim 1 and a method for operating a Gargerätevorrichtung according to claim 1 1.

From the prior art, a cooking device device with a first and a second rectifier diode is known, which are arranged in a series circuit. A

Series connection of two switching units of Gargerätevorrichtung and the

Series connection of the rectifier diodes are connected in parallel. Parallel to this, a buffer capacity is switched. The series connection of the switching units and the series circuit of the rectifier diodes are arranged in a full bridge circuit and connected to each other via a bridge branch, in which a

Series connection of an AC voltage source and a Boostinduktor the

Gargerätevorrichtung is arranged. Here, the AC voltage source is the

Rectifier diodes facing and arranged directly with each of the

 Rectifier diodes connected. A series connection of an induction heating element and a damping capacity of the cooking appliance device branches from a connection between the two switching units and from a connection between a second of the

Switching units and the buffer capacity.

The object of the invention is, in particular, a generic

Gargerätevorrichtung with improved properties to provide high efficiency. The object is achieved by the features of

Patent claim 1 solved, while advantageous embodiments and modifications of the invention can be taken from the dependent claims.

It is a Gargerätevorrichtung, in particular a hob device, proposed with a first, a second, a third and a fourth switching unit, each having a switching element and a switching element connected in parallel to the diode and which are provided together, an AC voltage, in particular a

 Mains voltage to rectify, and with a control unit, which is intended, in at least one operating state, the switching elements of the first and the second

To stimulate switching unit to generate a high-frequency heating current in particular for a heating element of Gargerätevorrichtung. A "cooking device device" should be understood in particular to mean at least one part, in particular a subassembly, of a cooking device, in particular of a cooktop and preferably of an induction cooktop become. In particular, the cooking appliance device may also comprise the entire cooking appliance, in particular the entire hob and preferably the entire induction hob. A "switching unit" is to be understood as meaning, in particular, a unit which is intended to change a current-conducting property when a switching position is changed. <br/><br/> The switching units are in particular designed as bidirectional, unipolar switches and in particular in a first switching position of the respective

Switching element at least substantially unimpeded happen regardless of a polarity of an applied voltage regardless of a polarity of an applied voltage, wherein the switching units in a second switching position of the respective switching element an electric current depending on a polarity of a voltage applied to the respective switching unit voltage pass at least substantially unhindered or at least Block essentially. A "switching element" is to be understood, in particular, as an electrical and / or electronic element which has a first contact and a second contact and which is intended to establish and / or to separate an electrically conductive connection between the first contact and the second contact and in particular in addition to the first contact and the second contact, in particular has a control contact for receiving a control signal, In particular, the switching element can be switched via the control contact, wherein the switching element can be provided in particular by means of the control contact a control signal, in particular from the control unit, to receive and depending on the

 Control signal to change a switching position. For example, the switching element could be designed as a mechanical and / or electromechanical and / or electromagnetic switching element, in particular as a relay. The switching element could alternatively be designed as a transistor, in particular as a power transistor and preferably as an IGBT. A "diode" is to be understood as meaning, in particular, an electrical and / or electronic component which allows an electrical current to pass through at least substantially unhindered, depending on a polarity of a voltage applied to the diode, or at least substantially blocks it A "heating current" is to be understood in particular as meaning an electric current which is supplied to the heating element in particular in at least one operating state and which changes its current intensity over a time course, in particular periodically with one

Heating frequency, which advantageously has a value in a range of 10 kHz to 150 kHz, preferably from 20 kHz to 100 kHz. A "heating element" is to be understood in this context, in particular an element which is intended to convert energy, preferably electrical energy, into heat and in particular to feed at least one cookware. Advantageously, the heating element is designed in particular as an induction heating element and is preferably provided to generate an alternating electromagnetic field, in particular with a heating frequency of 10 kHz to 500 kHz, preferably from 20 kHz to 100 kHz, which is in particular provided in a set up, in particular Metallic and preferably ferromagnetic cooking plate bottom by eddy current induction and / or

Re-magnetization effects to be converted into heat. A "control unit" is to be understood in particular as meaning an electrical and / or electronic unit which is preferably at least partially integrated in a control and / or regulating unit of a cooking appliance and which is preferably provided to control and / or regulate at least the switching elements Preferably, the control unit comprises a computing unit and, in particular in addition to the computing unit, a memory unit with one therein

stored control and / or regulation program, which is intended by the

Calculation unit to be executed. Under the phrase that the control unit is provided to "excite" the switching elements of the first and the second switching unit in at least one operating state to generate a high-frequency heating current, in particular for the heating element, should be understood in particular that the control unit in the at least one operating state a switching position of the switching elements of the first and second switching unit by transmitting a control signal to the switching elements periodically changes with a heating frequency, in particular a value in a range of 10 kHz to 150 kHz, preferably from 20 kHz to 100 kHz, and with which in particular the "high-frequency heating current" flows through the heating element in the at least one operating state. "Provided" is to be understood in particular to be specially programmed, designed and / or equipped. The fact that an object is intended for a specific function should in particular mean that the object fulfills and / or executes this specific function in at least one application and / or operating state.

In particular, a high efficiency can be achieved by the embodiment according to the invention. In particular, several heating elements can be supplied, namely

in particular with a small number of electrical and / or electronic

Units. Advantageously, low line losses can be achieved and thereby high efficiency can be made possible. In particular, a high degree of flexibility can be achieved by permitting a permeability for electrical current of each switching unit to be changed as desired, in particular for the rectification of the alternating voltage Rectification advantageously over the diodes and / or via the switching elements of the switching units can be made possible.

It is also proposed that the control unit be provided, in at least one operating state, the switching elements of the third and the fourth switching unit to generate a high-frequency further heating current in particular for another

To stimulate heating element of Gargerätevorrichtung. As a result, in particular a plurality of heating elements can be supplied, in particular with a small number of electrical and / or electronic units, which in particular a high efficiency can be achieved.

The control unit could, for example, be provided to control the heating current and the further heating current jointly and at least essentially continuously.

in particular continuously and / or while avoiding deactivation of

Heating elements to provide. In this case, the control unit could have a heating frequency of

Heater current and a further heating frequency of the further heating current match, in particular to avoid intermodulation drone. Preferably, the

However, control unit provided to provide the heating current and the further heating current in a time division multiplex. Under the phrase that the control unit is intended to provide the heating current and the further heating current "in a time multiplex", should be understood in particular that the control unit, the heating current in a first time interval and the other heating current in a second time interval, in particular by controlling Switching units provides, wherein the first time interval and the second time interval are overlap-free and preferably the second time interval directly following the first time interval, and in that the control unit in particular the first time interval and the second time interval in particular in a periodic change follow one another, wherein a period of the Time division multiplexing in particular has a maximum value of 2 min, in particular of at most 1 s, advantageously of not more than 0.5 s, particularly advantageously of not more than 0.3 s, preferably of not more than 0.2 s and more preferably of not more than 0.1 s. In the time multiplex betrei bt the control unit, the heating element in particular in the first time interval and the further heating element in the second time interval, which temporally in particular directly adjoins the first time interval, in a periodic change, in particular with the multiplex frequency. The control unit is provided in particular for this, in particular the heating element and the further heating element by means of

To operate pulse density modulation and in particular the heating current and the other

To provide heating current by means of pulse density modulation. Alternatively or additionally, the Control unit be provided in particular to operate in particular the heating element and the further heating element by means of pulse width modulation and in particular to provide the heating current and the further heating current by means of pulse width modulation.

As a result, in particular respective output powers of the heating elements can be adjusted independently of each other.

Furthermore, it is proposed that the cooking device device comprises an up-converter unit, which is formed in part by the first and the second switching unit and / or by the third and fourth switching units and which is intended to convert an input voltage into an output voltage that is greater than the input voltage , A "boost converter unit" is to be understood in particular as a unit which is intended to convert a first AC voltage, in particular the input voltage, into a second AC voltage, in particular the output voltage, and / or which is designed as an AC-AC boost converter. The boost converter unit has, in particular, at least one inductance, in particular a boost inductance, and a diode connected in series with the inductance and a switching element and a capacitor, in particular a buffer capacitor, which is arranged in particular on an end of the series circuit of inductance and diode facing away from the inductance In particular, the control unit is provided to apply the input voltage to the inductance by changing a switching position of the switching element and, in particular, to switch the capacitance and the inductance parallel to one another In particular, it is provided in the case of a closed switching element of the boost converter unit, in particular in the case of an adjacent switching element

Input voltage to increase an energy stored in the inductance of the boost converter unit. In particular, the inductance of the step-up converter unit is provided, in the case of an open switching element of the step-up converter unit, in particular in the case of a non-applied input voltage, to maintain a current flow through the inductor unchanged and thus in particular to charge the capacitor via the diode, which in particular transmits the electrical energy transmitted by the inductance stores. The diode of the step-up converter unit is provided, in particular, for at least substantially preventing a backflow of the energy stored in the capacitance in the direction of the inductance. The switching element as well as the diode of the step-up converter unit could, in particular in a periodic change on the one hand by the switching element of the first switching unit and the diode of the second switching unit and on the other hand of the

Switching element of the second switching unit and the diode of the first switching unit to be formed. In a heating of the further heating element, in which the Booster unit is formed in particular partially by the third and the fourth switching unit, the switching element and the diode of the boost converter unit, in particular in a periodic change on the one hand by the switching element of the third switching unit and the diode of the fourth switching unit and on the other hand of the

Switching element of the fourth switching unit and the diode of the third switching unit may be formed. As a result, in particular a high efficiency can be achieved, since a lower electrical current is advantageously required to achieve a specific output power. It is also proposed that the cooking device device comprises a buffer capacitor which is connected in parallel to the first and the second switching unit, in particular to a series connection of the first and the second switching unit, and which has a capacitance value of at most 10 Ω, in particular of at most 8 Ω , preferably of at most 7 ^ F, more preferably of at most 6 ^ F and preferably of at most 5 ^ F, and which is preferably part of the up-converter unit. In particular, the buffer capacity has a capacitance value of at least 0.01 Ω, preferably at least 0.05 Ω, and preferably at least 0.1 Ω. Advantageously, the buffer capacity is connected in parallel to the third and the fourth switching unit, in particular to a series connection of the third and the fourth switching unit. A "capacity" is to be understood in particular as any series connection and / or parallel connection of capacitors.

 As a result, in particular an energy store can be provided for storing excess energy.

In addition, it is proposed that the boost converter unit is intended to increase a voltage applied to the buffer capacitor, whereby in particular a particularly advantageous high efficiency can be achieved. In particular, a low-cost configuration and / or a small number of components can be made possible.

Preferably, the cooking appliance device comprises a resonant capacitance associated with the first and second switching units, and more preferably another

 Resonant capacitance associated with the third and fourth switching units. The

Resonance capacitance and / or the further resonance capacitance have / has, in particular, a maximum capacitance value of 10 5 F, in particular of at most 800 pF, advantageously of at most 700 pF, particularly advantageously of not more than 600 pF and preferably of not more than 500 pF. The resonance capacitance and / or the further resonance capacitance have / has a capacitance value, in particular of at least 100 pF, particularly advantageously of at least 150 pF and preferably at least 20 pF. As a result, in particular a high resistance for low-frequency electrical current can be achieved at a flow rate at least through the heating element, in particular by a series connection of the heating element and the resonance capacity. Furthermore, by means of such an embodiment, a resonant frequency and / or a further resonant frequency can be adjusted to an advantageous value as a function of an inductance of the heating element and / or the further heating element.

It is also proposed that in at least one operating state by the second switching unit in a first switching position, in particular the switching elements of

 Switching units, two different electrical currents flow in the same direction of current flow. In particular, in at least one operating state, in particular when the further heating element is heated, two different electrical currents flow in the same current flow direction through the fourth switching unit in a switching position corresponding to the first switching position. Under "different" electrical currents are intended

In particular, electrical currents are understood that differ significantly in a value of at least one property, such as in particular a frequency and / or a duty cycle, such as by a factor of at least 1, 5, in particular of at least 2, advantageously of at least 5, especially advantageously at least 10 and preferably at least 100, and in particular both flow either in the technical current flow direction or both in the physical current flow direction. A first electric current of the various electrical currents has, in particular, a frequency of 10 kHz to 500 kHz, preferably of 20 kHz to 100 kHz, and a second electric current of the different electrical currents has in particular a frequency of 50 Hz to 60 Hz. This can be achieved in particular a high efficiency.

In addition, it is proposed that in at least one operating state by the first switching unit in a second switching position, in particular the switching elements of

Switching units, two different electric currents in opposite

Current flow direction flow. In particular, in at least one operating state, in particular when the further heating element is heated, two different electrical currents flow in the opposite direction of current flow through the third switching unit in a switching position corresponding to the second switching position. This can be achieved in particular a high efficiency. The cooking appliance device should not be limited to the application and embodiment described above. In particular, in order to fulfill a mode of operation described herein, the cooking appliance device may have a different number than a number of individual elements, components and units mentioned herein. A mode of operation described herein in relation to the heating current and / or the heating element applies analogously to the further heating current and / or the further heating element. An operation described herein with respect to the first and second switching units applies analogously to the third and fourth switching units. 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 expert will expediently consider the features individually and to meaningful further

Combine combinations.

Show it:

 1 shows a cooking appliance with a cooking appliance device in a schematic plan view, Fig. 2 shows the cooking appliance apparatus in a general state in a schematic

 Presentation,

3 shows a diagram in which in each case a time profile of a mains voltage, a mains current, a zero-crossing signal, a first gate signal, a first heating current, a second gate signal, a second heating current and an output power provided to a cooking utensil are shown Fig. 4 is a graph of output power versus frequency for three different ones

 heating elements,

 5 shows the cooking device device in a first switching position in a schematic

 Presentation,

 6 shows the cooking device device in a second switching position in a schematic

 Presentation,

7 shows the cooking device device in a third switching position in a schematic

 Presentation and

 8 shows the cooking device device in a fourth switching position in a schematic

 Presentation.

Fig. 1 shows a cooking appliance 50, which is designed as a hob, with a

Gargerätevorrichtung 10, which is designed as a hob device. The cooking appliance For example, it could be designed as an oven, in particular as an induction oven, and / or as a stove, in particular as an induction cooker. In the present embodiment, the cooking appliance 50 is designed as a hob. The cooking appliance 50 is designed as an induction hob. The cooking appliance 50 comprises a device plate 52. In an assembled state, the appliance plate 52 forms part of an outer housing, in particular of the cooking appliance 50. The device plate 52 forms in an installed position an operator facing part of the outer housing. The device plate could be designed, for example, as a front plate and / or cover plate of the outer housing, in particular of a cooking appliance embodied as an oven and / or as a stove. In the present embodiment, the device plate 52 is formed as a hob plate. In the mounted state, the appliance plate 52 is provided for setting up cooking utensils.

The cooking appliance 50 comprises an operating unit 54 for inputting and / or selecting operating parameters (see FIG. 1), for example a heating power and / or a heating power

Heat density and / or a heating zone. The operation unit 54 is provided for outputting a value of an operation parameter to an operator. In this case, the operating unit could optically and / or acoustically output the value of the operating parameter to an operator. The cooking appliance device 10 comprises a control unit 38. The control unit 38 is provided to execute actions and / or to change settings as a function of operating parameters entered by means of the operating unit 54.

The cooking device device 10 comprises a heating element 36 (see Fig. 2). The heating element 36 has a first contact and a second contact. The cooking device device 10 comprises a further heating element 40 (see Fig. 2). The further heating element 40 has a first contact and a second contact. In Fig. 2, the heating element 36 and the further heating element 40 are each shown as a coil and a Wderstand. In addition, the cooking appliance device 10 comprises a plurality of further heating elements 36, 40, which are not shown in FIGS. 1 to 8. The heating elements 36, 40 are provided to heat on the device plate 52 above the heating elements 36, 40 set up cooking utensils. The heating elements 36, 40 are designed as induction heating elements. The control unit 38 regulates a power supply to the heating elements 36, 40 in a heating operating state. In the present exemplary embodiment, the heating element 36 has an inductance with a value of substantially 100 μΗ. Alternatively, the heating element could have an inductance of a different value, which could advantageously be in a range of 10 μΗ to 500 μΗ. The heating element 36 has a resistance in the case of an erected cooking utensil with a value that depends on the properties of the cookware. For example, the heating element could have a resistor of a different value, which could advantageously be in a range of 1 Ω to 100 Ω. The heating element 36 and the further heating element 40 are formed substantially the same.

The cooking appliance device 10 is for connection to a voltage source 56

provided (see Fig. 2). Here, the cooking appliance device 10 is provided for connection to an AC voltage source. In the assembled state is the

Gargerätevorrichtung 10 connected to an electrical network, in particular the cooking appliance 50. The cooking device device 10 is country-specific intended to be connected to different voltage sources 56. Depending on a country, the cooking device device 10 is intended to be connected to AC voltages typical for the respective country. For example, a cooking appliance device provided for operation in Germany could be provided to supply a mains voltage with an effective value of substantially 230 V and with a

Frequency of substantially 50 Hz to be connected. For example, a cooking appliance device intended for US operation could be intended to be connected to a power supply voltage having a frequency of substantially 60 Hz. The cooking appliance device 10 has a first and a second contact. The voltage source 56 has a first contact and a second contact. The first contact of the cooking appliance device 10 and the first contact of the voltage source 56 are electrically conductively connected to each other. The second contact of the cooking appliance device 10 and the second contact of the voltage source 56 are electrically conductively connected to each other. In the following, the contacts of the voltage source 56 are used for a description.

The cooking device device 10 comprises a boost inductance 58. For example, the boost inductance could be formed by any parallel connection and / or series connection of inductances. In the present embodiment, the boost inductance 58 is formed by an inductor. The boost inductance 58 has a first contact and a second contact. The second contact of the voltage source 56 and the first contact of the boost inductance 58 are electrically conductively connected to one another.

The cooking appliance apparatus 10 includes a resonant capacitor 46. For example, the resonant capacitance could be formed by any parallel connection and / or series connection of capacitors. In the present embodiment, the Resonant capacitance 46 formed by a capacitor. The resonant capacitor 46 has a first contact and a second contact. The second contact of the heating element 36 and the first contact of the resonance capacitor 46 are electrically conductively connected to each other. The resonant capacitance 46 is associated with the heating element 36. The first contact of the heating element 36 and the first contact of the voltage source 56 are electrically conductively connected to each other. The resonant capacitance 46 has a capacitance value of substantially 300 pF. Alternatively, the resonance capacity could be another

Capacitance value, which could be advantageous in a range of 100 pF to 1000 pF.

The cooking device device 10 comprises a first switching unit 12 and a second

Switching unit 14 and a third switching unit 16 and a fourth switching unit 18. The first switching unit 12 has a first switching element 20 and a first diode 28 connected in parallel to the first switching element 20. The second switching unit 14 has a second switching element 22 and a second connected in parallel to the second switching element 22 second

Diode 30 on. The third switching unit 16 has a third switching element 24 and a third diode 32 connected in parallel with the third switching element 24. The fourth switching unit 18 has a fourth switching element 26 and a fourth diode 34 connected in parallel with the fourth switching element 26. The switching units 12, 14, 16, 18 are formed substantially the same, so a structure of the switching units 12, 14, 16, 18 is generally described for a switching unit 12, 14, 16, 18. Resonant capacitance 46 is associated with first and second switching units 12, 14.

The switching element 20, 22, 24, 26 has a first contact and a second contact. The switching element 20, 22, 24, 26 also has a control contact in addition to the first contact and the second contact. The control unit 38 controls in an operating state, the switching element 20, 22, 24, 26 by means of the control contact. By means of a control of the switching element 20, 22, 24, 26 changes the control unit 38 in the operating state, a switching position of the switching element 20, 22, 24, 26. The diode 28, 30, 32, 34 has a first contact and a second contact. The first contact of the switching element 20, 22, 24, 26 and the first contact of the diode 28, 30, 32, 34 are electrically conductively connected to each other. The second contact of the switching element 20, 22, 24, 26 and the second contact of the diode 28, 30, 32, 34 are electrically conductively connected to each other. The switching unit 12, 14, 16, 18 has a first contact and a second contact. The first contact of the switching unit 12, 14, 16, 18 is electrically connected to the first contact of the switching element 20, 22, 24, 26 and the first contact of the diode 28, 30, 32, 34. The second contact of the Switching unit 12, 14, 16, 18 is electrically connected to the second contact of the switching element 20, 22, 24, 26 and the second contact of the diode 28, 30, 32, 34. A

Passage direction of the switching element 20, 22, 24, 26 and a forward direction of the diode 28, 30, 32, 34 are antiparallel to each other. The passage direction is given in relation to a technical current flow direction.

The second contact of the first switching unit 12 and the first contact of the heating element 36 are electrically conductively connected to each other. The second contact of the first switching unit 12 and the first contact of the voltage source 56 are electrically conductively connected to each other. The second contact of the first switching unit 12 and the first contact of the second switching unit 14 are electrically conductively connected to each other. The first contact of the second switching unit 14 and the first contact of the heating element 36 are electrically conductively connected to each other. The first contact of the second switching unit 14 and the first contact of the voltage source 56 are electrically conductively connected to each other. The second contact of the second switching unit 14 and the second contact of the resonance capacitor 46 are electrically conductively connected to each other.

The first switching unit 12 and the second switching unit 14 are connected in series. The third switching unit 16 and the fourth switching unit 18 are connected in series. The first contact of the first switching unit 12 and the first contact of the third switching unit 16 are electrically conductively connected to one another. The second contact of the second switching unit 14 and the second contact of the fourth switching unit 18 are electrically conductively connected to each other. The second contact of the third switching unit 16 and the first contact of the fourth

Switching unit 18 are electrically connected to each other. The second contact of the third switching unit 16 and the second contact of the boost inductance 58 are electrically conductively connected to one another. The first contact of the fourth switching unit 18 and the second contact of the boost inductance 58 are electrically conductively connected to one another. The second contact of the resonance capacitor 46 and the second contact of the second switching unit 14 are electrically conductively connected to each other. The second contact of the resonance capacitance 46 and the second contact of the fourth switching unit 18 are electrically conductive with each other

connected.

The cooking appliance device 10 comprises a further resonance capacity 48. For example, the resonance capacity could be generated by any parallel connection and / or

Series circuit of capacitors may be formed. In the present embodiment, the further resonance capacity 48 is formed by a capacitor. The others Resonant capacitance 48 has a capacitance value of substantially 300 pF.

Alternatively, the further resonant capacitance could have a different capacitance value, which could advantageously be in a range of 100 pF to 1000 pF. The further resonance capacitor 48 has a first contact and a second contact. The second contact of the further heating element 40 and the first contact of the further resonance capacitor 48 are connected to one another in an electrically conductive manner. The others

Resonant capacity 48 is associated with the further heating element 40. The others

Resonant capacity 48 is associated with the third and fourth switching units 16, 18. The second contact of the further resonance capacitor 48 and the second contact of the

 Resonant capacitance 46 are electrically connected to each other. The second contact of the further resonance capacitor 48 and the second contact of the second switching unit 14 are electrically conductively connected to one another. The second contact of the others

Resonant capacitance 48 and the second contact of the fourth switching unit 18 are electrically connected to each other. The first contact of the further heating element 40 and the second contact of the boost inductance 58 are electrically conductively connected to one another. The first contact of the further heating element 40 and the second contact of the third switching unit 16 are electrically conductively connected to one another. The first contact of the other

Heating element 40 and the first contact of the fourth switching unit 18 are electrically conductively connected to each other.

The cooking appliance apparatus 10 includes a buffering capacity 44. For example, the buffering capacity could be formed by any parallel connection and / or series connection of capacitors. In the present embodiment, the buffer capacity 44 is formed by a capacitor. The buffer capacity 44 has a capacitance value of substantially 5 ^ F. Alternatively, the buffering capacity could have a different capacitance value, which could advantageously be in the range of 0.1 ^ F to 10 ^ F.

The buffering capacitor 44 has a first contact and a second contact. The first contact of the first switching unit 12 and the first contact of the buffer capacitor 44 are electrically conductively connected to each other. The first contact of the third switching unit 16 and the first contact of the buffer capacitor 44 are electrically conductively connected to one another. The second contact of the further resonance capacitor 48 and the second contact of the

Buffer capacity 44 are electrically connected to each other. The second contact of the second switching unit 14 and the second contact of the buffer capacitor 44 are electrically conductively connected to each other. The second contact of the fourth switching unit 18 and the second Contact the buffer capacity 44 are electrically connected to each other. The second contact of the further resonance capacitor 48 and the second contact of the buffer capacitor 44 are electrically conductively connected to one another. The buffer capacitor 44 is connected in parallel with the first and second switching units 12, 14. In this case, the buffer capacitor 44 is connected in parallel with a series connection of the first switching unit 12 and the second switching unit 14. The buffering capacitor 44 is connected in parallel with the third and fourth switching units 16, 18. In this case, the buffer capacitor 44 is connected in parallel with a series connection of the third switching unit 16 and the fourth switching unit 18. The first and second switching units 12, 14 are connected in parallel with the third and fourth switching units 16, 18. The series connection of the first switching unit 12 and the second switching unit 14 and the series connection of the third switching unit 16 and the fourth switching unit 18 are connected in parallel. The switching units 12, 14, 16, 18 are arranged in the form of a bridge circuit. The series connection of the first switching unit 12 and the second switching unit 14 and the series circuit of the third switching unit 16 and the fourth switching unit 18 are electrically conductively connected to each other via a bridge branch. In the bridge branch, the voltage source 56 and the boost inductance 58 are arranged. In the operating state, the switching units 12, 14, 16, 18 equal an AC voltage which is the

 Voltage source 56 provides. The voltage source 56 provides a mains voltage 60 in the operating state. The voltage source 56 provides a mains current 62 in the operating state. The mains current 62 has a frequency in the range from 50 Hz to 60 Hz in the present exemplary embodiment. The switching elements 20, 22, 24, 26 of the switching units 12, 14, 16, 18 are aligned in the same way. The diodes 28, 30, 32, 34 of the switching units 12, 14, 16, 18 are aligned the same.

In the operating state, the control unit 38 activates the switching elements 20, 22, 24, 26 of the switching units 12, 14, 16, 18 to generate a high-frequency heating current for the heating element 36 and the further heating element 40. The operating state includes a first heating operation state and a second heating operation state. In the first

In the second heating mode, the control unit 38 operates the further heating element 40. In the operating state, in particular in the first heating operating state, the

Control unit 38, the switching elements 20, 22 of the first and second switching unit 12, 14th for generating a high-frequency heating current 68 for the heating element 36. The control unit 38 operates in the first heating operation state, the heating element 36 by means of the first switching element 20 and the second switching element 22. In the first

Heating mode, the heating element 36 is flowed through by the high-frequency heating current 68. The heating element 36 provides electrical energy to a set up cooking utensil in the first heating mode.

In the operating state, in particular in the second heating operating state, the control unit 38 excites the switching elements 24, 26 of the third and fourth switching units 16, 18 to generate a high-frequency further heating current 72 for the further one

 Heating element 40 on. The control unit 38 operates in the second heating operation state, the further heating element 40 by means of the third switching element 24 and the fourth

Switching element 26. In the second heating mode, the further heating element 40 is flowed through by the high-frequency further heating current 72. The further heating element 40 provides in the second heating operating state electrical energy to a set up further cooking utensils ready. The set up cooking utensils and the set up additional cooking utensils may be, in particular, different types of cooking utensils. Alternatively, the prepared cooking utensils and the set up additional cooking utensils may in particular be the same cooking utensils.

The control unit 38 operates in the operating state the heating element 36 and the further heating element 40 in a time-division multiplex (see Fig. 3). In the operating state, the

Control unit 38, the heating current 68 and the other heating current 72 in the time division multiplex ready. In the operating state, the control unit 38 operates the heating element 36 and the further heating element 40 alternately with respect to a time. The control unit 38 operates the heating element 36 and the further heating element 40 by means of pulse density modulation. The

Control unit 38, in the operating state via a number of pulses, with which the control unit 38 of one of the heating elements 36, 40 operates, an output power 74, 76 of the corresponding heating element 36, 40 a.

In the operating state, the control unit 38 divides a period T _A B into a time interval T _A and a further time interval T _B. In the first heating mode, the control unit 38 energizes the first switching element 20 and the second switching element 22 during the first time interval T _A. In the second heating operation state, the control unit 38 energizes the third switching element 24 and the fourth switching element 26 during the second time interval T _B. For example, the control unit 38 operates the heating element 36 in the first Heating mode by means of substantially 80% of the pulses. In the first

Heating mode fall substantially 80% of the provided during the entire period TAB mains voltage 60 to the heating element 36 at. In the first heating operating state, substantially 80% of the mains current 62 flowing during the entire period T _A B flows through the heating element 36. In addition to the mains voltage 60 and the

Mains power 62, a zero crossing signal 64 is shown in Fig. 3. In the first

Heating mode, a gate signal 66 is applied to the heating element 36. The control unit 38 operates in the first heating mode, the heating element 36 by means of the heating current 68. In Fig. 3, an envelope of the heating current 68 is shown. The heating current 68 has a value of substantially 80% of the mains current 62 flowing during the entire period T _AB . In the operating state, the heating element 36 provides an output 74 to the erected cooking utensils. The output power 74 of the heating element 36 in the operating state is substantially 80% of a total output power.

For example, the control unit 38 operates the further heating element 40 in the second heating mode by means of substantially 20% of the pulses. In the second

Heizbetriebszustand accumulate substantially 20% of the provided during the entire period TAB mains voltage 60 to the other heating element 40 at. In the second heating operating state, essentially 20% of the mains current 62 flowing during the entire period T _A B flows through the further heating element 40. In the second heating operating state, another gate signal 70 is applied to the further heating element 40. The control unit 38 operates in the second heating mode, the further heating element 40 by means of the further heating current 72. In Fig. 3 is an envelope of the other

Heating current 72 shown. The further heating current 72 has a value of essentially 20% of the mains current 62 flowing during the entire period T _AB . In the operating state, the further heating element 40 provides a further output power 76 to the set up additional cooking utensils. The further output power 76 of the further heating element 40 in the operating state is essentially 20% of a total output power.

In Fig. 4, an output power 74, 76 is a function of a frequency for three

shown different cookware, in each case only one of the heating elements 36, 40 is activated. The cookware is arbitrarily selected and different

for example in geometry and material. We can see in Fig. 4, results for each case an operating curve, which is typical for a half-bridge circuit, for example, with a maximum of the corresponding output power 74, 76 at a resonant frequency.

The cooking appliance apparatus 10 includes a boost converter unit 42. In the example of FIGS. 5-8, the boost converter unit 42 is partially formed by the first and second shifter units 12, 14. The boost converter unit 42 is partially formed by the boost inductance 58. The boost inductance 58 has an inductance with a value in a range of 100 μΗ to 10 mH. The boost converter unit 42 is partially formed by the buffering capacitor 44. The buffer capacity 44 ensures a uniform power factor in the operating state. In the operating state, the buffering capacitor 44 filters high-frequency alternating current.

The boost converter unit 42, in the operating state, converts an input voltage to an output voltage that is greater than the input voltage. The voltage source 56 provides the input voltage. The input voltage is formed as an AC voltage. In the operating state, the boost converter unit 42 increases a voltage applied to the buffer capacitor 44 voltage. The voltage applied to the buffer capacity 44

Voltage essentially corresponds to the output voltage into which the

Up conversion unit 42 converts the input voltage in the operating state. The output voltage is formed as an AC voltage.

For example, in a first switching configuration, an electrical current flows through the boost inductance 58. In a second switching configuration, current flow through the boost inductance 58 is interrupted. The boost inductance 58 maintains the current flow through the boost inductance 58 for a short time. The boost inductance 58 charges the buffer capacitor 44 with energy stored in the boost inductance 58. At the buffer capacity 44 is at this time the output voltage, which is greater than that

Input voltage. A value of the output voltage is calculated using the following formula:

 i

¥ ^{s =} 1 = ^{1l ¥ 1}

Herein, V _B us is the output voltage and V _A c is the input voltage. In addition, D is a duty cycle of the switching units 12, 14, 16, 18, the switching elements 20, 22, 24, 26, the control unit 38 to generate a high-frequency heating current 68, 72 for the corresponding heating element 36, 40 excites. The control unit 38 adjusts the output power 74, 76 of the corresponding heating element 36, 40 by means of a duty cycle D in the operating state. The duty cycle D is defined as a quotient of the time duration T _A , T _B , in which the corresponding

Switching element 20, 22, 24, 26 is activated, and the period T _A B-

By way of example, FIGS. 5 to 8 show the first heating operating state in which the control unit 38 operates the heating element 36. Here, four different switching positions of the switching units 12, 14, 16, 18 are shown. The second heating mode is analogous to this, which is why such an analogous description is omitted below. A current flow direction of a rectified electric current is shown in phantom in FIGS. 5 to 8. A current flow direction of the electric heating current 68 is shown in phantom in FIGS. 5 to 8. In the operating state, the series connection of the heating element 36 and the resonance capacitor 46 blocks the low-frequency mains current 62 from entering it

Series. The control unit 38 operates the first switching unit 12 and the second switching unit 14 exclusively as an inverter in the first heating operation state. The control unit 38 operates the third switching unit 16 and the fourth switching unit 18 exclusively as an inverter in the second heating operation state. The

 Switching units 12, 14, 16, 18 are together part of a rectifier in the first heating mode and in the second heating mode.

In a first switching position (see Fig. 5), the control unit 38 closes the second

Switching element 22. The second switching element 22 leaves in the first switching position

electrical current to pass substantially unhindered. In the first switching position, the control unit 38 opens the first switching element 20. The first switching element 20 blocks electrical current substantially in the first switching position. The heating current 68 flows through the heating element 36, the second switching unit 14 and the resonance capacitance 46 in the first switching position. In the first switching position, the mains voltage 60 is applied to the boost inductance 58. The boost inductance 58 stores electrical energy in the first switching position. In the first switching position, the series circuit of the

Heating element 36 and the resonant capacitor 46 short-circuited. The rectified electrical current flows through the second switching unit 14 in the first switching position fourth switching unit 18 and the Boostinduktivität 58. In the operating state flow through the second switching unit 14 in the first switching position, two different electrical currents in the same direction of current flow. In a second switching position (see Fig. 6), the control unit 38 closes the first

Switching element 20. The first switching element 20 leaves in the second switching position

electrical current to pass substantially unhindered. In the second switching position, the control unit 38 opens the second switching element 22. The second switching element 22 essentially blocks electrical current in the first switching position. The heating current 68 flows in the second switching position by the heating element 36, resonance capacity 46, the

Buffer capacitance 44 and the first switching unit 12. In the second switching position, the boost inductance 58 transmits the stored energy which has stored the boost inductance 58, in particular in the first switching position, to the buffer capacitor 44. The buffer capacitor 44 supplies electrical energy to the heating element in the second switching position 36 off. The rectified electrical current flows in the second switching position through the first

Switching unit 12, the buffer capacity 44, the fourth switching unit 18 and the Boostinduktivität 58. In the operating condition flow through the first switching unit 12 in the second

Switching position two different electrical currents in opposite

Current flow direction. The buffer capacitor 44 receives electrical energy from the boost inductance 58 in the second switching position. In the second switching position, the buffer capacitor 44 provides electrical energy to the heating element 36.

In a third switching position (see Fig. 7), the control unit 38 closes the first

Switching element 20. The first switching element 20 can pass in the third switching position electric current substantially unhindered. In the third switching position opens the

Control unit 38, the second switching element 22. The second switching element 22 blocked in the third switching position electric current substantially. The heating current 68 flows in the third switching position through the heating element 36, resonance capacitance 46, the buffer capacitance 44 and the first switching unit 12. In the third switching position, the boost inductance 58 transmits the stored energy, which has stored the boost inductance 58, in particular in the fourth switching position the buffer capacity 44. The buffer capacity 44 is in the third switching position electrical energy to the heating element 36 from. The rectified electrical current flows through the boost inductance 58, the third switching unit 16 and the first switching unit 12 in the third switching position. In the operating state, two different electrical currents flow in the same current flow direction through the first switching unit 12 in the third switching position. The buffer capacity 44 receives in the third switching position electrical energy from the boost inductance 58. In the third switching position, the buffering capacity 44 provides electrical energy to the heating element 36.

In a fourth switching position (see Fig. 8), the control unit 38 closes the second

Switching element 22. The second switching element 22 can pass in the fourth switching position electric current substantially unhindered. In the fourth switching position, the control unit 38 opens the first switching element 20. The first switching element 20 blocks electrical current in the fourth switching position substantially. The heating current 68 flows through the heating element 36, the second switching unit 14 and the resonance capacitance 46 in the fourth switching position. In the fourth switching position, the mains voltage 60 is applied to the boost inductance 58. The boost inductance 58 stores electrical energy in the fourth switching position. In the fourth switching position, the series circuit of the

Heating element 36 and the resonant capacitor 46 short-circuited. The rectified electrical current flows through the boost inductance 58, the third switching unit 16, the buffer capacitor 44 and the second switching unit 14 in the fourth switching position

 Operating state flow through the second switching unit 14 in the fourth switching position two different electrical currents in the opposite direction of current flow.

In the operating state, the control unit 38 changes during a positive half cycle of the mains voltage 60 with a heating frequency between the first switching position and the second switching position. The heating frequency has a value in a range of 20 kHz to 500 kHz. The control unit 38 operates the switching elements 20, 22 of the first and the second switching unit 12, 14 with the heating frequency, in order in particular to generate the high-frequency heating current 68 for the heating element 36. In the operating state, the control unit 38 changes during a negative half cycle of the mains voltage 60 with the

Heating frequency between the third switching position and the fourth switching position.

Reference sign Gargerätevorrichtung

First switching unit

Second switching unit

Third switching unit

Fourth switching unit

First switching element

Second switching element

Third switching element

Fourth switching element

First diode

Second diode

Third diode

Fourth diode

heating element

control unit

Another heating element

Up converter unit

buffering capacity

resonant capacitance

Further resonance capacity

Cooking appliance

devices plate

operating unit

voltage source

Boostinduktivität

mains voltage

AC power

Zero-crossing signal

Gate signal

heating

Another gate signal Additional heating current Output power Further output power

Claims

Cooking appliance device, in particular hob device, having a first, a second, a third and a fourth switching unit (12, 14, 16, 18), each having a switching element (20, 22, 24, 26) and one to the switching element (20, 22 , 24, 26) have parallel connected diodes (28, 30, 32, 34) and which are provided together to rectify an AC voltage, and with a Control unit (38), which is provided in at least one operating state, the switching elements (20, 22) of the first and the second switching unit (12, 14) to generate a high-frequency heating current (68) to stimulate. Cooking appliance device according to claim 1, characterized in that the control unit (38) is provided, in at least one operating state, the switching elements (24, 26) of the third and the fourth switching unit (16, 18) for generating a high-frequency further heating current (72). to stimulate. Cooking appliance device according to claim 2, characterized in that the control unit (38) is provided to provide the heating current (68) and the further heating current (72) in a time division multiplex. Cooking device according to one of the preceding claims, characterized by an up-converter unit (42) which is formed in part by the first and the second switching unit (12, 14) and which is intended to convert an input voltage into an output voltage which is greater than the input voltage. Cooking appliance device according to one of the preceding claims, characterized by a buffer capacity (44), which is connected in parallel to the first and the second switching unit (12, 14) and which has a maximum capacitance value of 10 μΡ. Cooking appliance device according to claim 4 and 5, characterized in that the boost converter unit (42) is provided to increase a voltage applied to the buffer capacitor (44). Cooking appliance device according to one of the preceding claims, characterized by a resonance capacity (46) which is associated with the first and the second switching unit (12, 14) and which has a maximum capacitance value of 10 μΡ. Cooking appliance device according to one of the preceding claims, characterized in that in at least one operating state by the second switching unit (14) in a first switching position, two different electrical currents flow in the same direction of current flow. Cooking appliance device according to one of the preceding claims, characterized in that in at least one operating state by the first switching unit (12) in a second switching position, two different electrical currents flow in the opposite direction of current flow. Cooking appliance, in particular hob, with a cooking appliance device (10) according to one of the preceding claims. Method for operating a cooking appliance device, in particular a Hob device, in particular according to one of claims 1 to 9, having a first, a second, a third and a fourth switching unit (12, 14, 16, 18), each having a switching element (20, 22, 24, 26) and one to the switching element (20, 22, 24, 26) in parallel diode (28, 30, 32, 34), wherein by the switching units (12, 14, 16, 18) together an AC voltage is rectified and wherein in at least one operating state the Switching elements (20, 22) of the first and the second switching unit (12, 14) are excited to generate a high-frequency heating current (68).