EP4042834A1

EP4042834A1 - Cooking appliance

Info

Publication number: EP4042834A1
Application number: EP20775008.4A
Authority: EP
Inventors: José Miguel Burdio Pinilla; Tomas Cabeza Gozalo; Pablo GUILLEN MOYA; Sergio Llorente Gil; Oscar Lucia Gil; Diego Puyal Puente; Hector Sarnago Andia
Original assignee: BSH Hausgeraete GmbH
Current assignee: BSH Hausgeraete GmbH
Priority date: 2019-10-08
Filing date: 2020-09-24
Publication date: 2022-08-17
Also published as: WO2021069219A1

Abstract

The invention relates to a cooking appliance (10a-c), in particular a cooktop appliance, comprising: a plurality of at least two heating branches (12a-c), which each comprise at least one heating unit (14a-c) and at least one branch switching unit (16a-c); a switching unit (18a-c) common to the heating branches (12a-c); and at least one control unit (20a-c), which, in an operating state, in order to set a heating power of at least one of the heating branches (12a-c) to be operated, adjusts at least one switching parameter (22a-c) of a switching parameter set of the branch switching unit (16a-c) of the at least one heating branch (12a-c) to be operated.

Description

Cooking device device

The invention relates to a cooking device device according to claim 1 and a method for operating a cooking device device according to claim 14.

EP 2 548 407 B1 already discloses a hob with a half-bridge or full-bridge circuit for operating a plurality of inductors by means of a multiplexer.

A hob is already known from WO 2018/116053 A1 and WO 2018/116055 A1 which has a number N ^c M of heating matrix elements, an i, j th heating matrix element comprising at least one inductor and both an i th heating matrix element Row switching element as well as a j-th column switching element is connected.

The object of the invention is in particular to provide a generic device with improved properties in terms of efficiency, in particular energy efficiency and / or component efficiency. The object is achieved according to the invention by the features of claims 1 and 14, while advantageous embodiments and developments of the invention can be found in the subclaims.

A cooking appliance device, in particular a hob device, is proposed with a plurality of at least two heating branches, each of which comprises at least one heating unit, preferably an induction heating unit, and at least one branch switching unit, with a switching unit common to the heating branches and with at least one control unit, which in an operating state for setting a heating power at least one of the heating branches to be operated adapts at least one switching parameter of a switching parameter set of the branch switching unit of the at least one heating branch to be operated.

Such a configuration can in particular achieve a high level of efficiency, in particular a high level of energy efficiency. Because a number of components can be reduced, increased component efficiency and / or cost efficiency can be achieved. In particular, an independent power setting for all Heating branches are made, whereby a high degree of flexibility can be achieved in particular. When cooking utensils are heated, in particular an improved homogeneity can be achieved. In particular, uneven heating of cookware can be avoided. Unintentional overheating, especially the edge of a cookware, can be avoided. A heating power can be set, in particular proportionally to the coverage of the heating branch by cooking utensils. In particular, a power setting can be made independently of different cookware. An energy supply can in particular take place continuously and in particular unpulsed, whereby acoustic interfering noises in particular can be avoided. In particular, there is no need for an excessive power supply to achieve an average output. Overpower and / or a boost mode can be dispensed with, as a result of which, in particular, efficiency can be increased. An energy supply can be constant. Unwanted alternative heating can also be avoided. Likewise, an electromagnetic compatibility of the Garge device device can be improved by such a configuration, whereby flicker can be avoided. The cooking appliance device can in particular be operated with a reduced switching frequency, as a result of which, in particular, improved efficiency can be achieved.

A “cooking appliance device”, in particular a “hob device”, should be understood to mean in particular at least a part, in particular a subassembly, of a cooking appliance, in particular a hob. The cooking device could, for example, be designed as an oven, in particular an induction oven, and / or as a combination device with an additional microwave function. The cooking appliance is preferably designed as a hob, in particular as an induction hob, preferably as a matrix hob and particularly preferably as a matrix induction hob. In particular, the cooking appliance device, in particular the hob device, can also include the entire cooking appliance, in particular the entire hob.

The cooking appliance device advantageously has at least four, preferably at least 10 and particularly preferably at least 20 heating branches. A “heating branch” is to be understood in particular as an electronic and / or electrical unit which in particular comprises a plurality of electronic and / or electrical components, in particular at least one and advantageously exactly one heating unit and at least one and advantageously exactly one branch switching unit. The heating branches of the cooking device device could, for example, be constructed identically to one another. Alternatively, the heating branches of the cooking appliance device could differ at least with regard to the heating units, in particular with regard to diameters and / or types of heating units. Alternatively or additionally, the heating branches of the cooking appliance device could differ, for example, with regard to the number of heating units.

A “heating unit” is to be understood as meaning, in particular, a unit which, in an operating state for heating a cookware and / or a cooking muffle wall, provides a heating output, in particular a heating output of at least 100 W, preferably of at least 250 W and particularly preferably of at least 500 W is adjustable. An "induction heating unit" is to be understood as meaning, in particular, a heating unit with at least one induction heating element, in particular an inductor, which is used to generate an alternating magnetic field with high-frequency current, in particular with a frequency of at least 10 kHz, preferably of at least 20 kHz and in particular of a maximum of 100 kHz, can be supplied. The induction heating unit can comprise several induction heating elements connected in series and / or in parallel, for example to provide a multi-circuit or a roasting area.

A “branch switching unit” is to be understood as meaning, in particular, a unit of a heating branch which in particular comprises at least one switching unit. A “switching unit” is to be understood as meaning, in particular, a unit with at least one switching element which is provided in particular to establish and / or separate an electrically conductive connection between two contacts of the switching element. The switching element preferably has at least one control contact via which it can be controlled. In particular, the switching element is designed as a semiconductor switching element, in particular as a transistor, advantageously as a bipolar transistor with a preferably insulated gate electrode (IGBT). Alternatively, the switching element can be designed as a mechanical and / or electromechanical switching element, in particular as a relay. For example, the switching element can be designed as an FET, as a MOSFET, preferably as an RC-IGBT and particularly preferably as a HEMT transistor. The switching unit can comprise several switching elements, which can be connected to one another in series and / or in parallel, for example. To set a heating output of at least one of the heating branches to be operated, i.e. to adjust the heating output of the corresponding heating unit of the heating branch, the control unit advantageously adapts at least two switching parameters of a switching parameter set of the branch switching unit of the at least one heating branch to be operated in an operating state. In particular, the switching parameter is different from a switching frequency of the branch switching unit. In particular, the control unit is provided to control the branch switching units and the common switching unit in pairs as inverter switching elements, in particular in such a way that a soft switching process between at least one first switching state in which two contacts of the common switching unit are electrically connected, while two contacts all branch switching units are separated and a second switching state occurs in which two contacts of at least one of the branch switching units are electrically conductively connected, while the two contacts of the common switching unit are separated. A “soft switching process” is to be understood in particular as a switching process with a negligibly low power loss, which occurs in particular when the switching process is preferably at least substantially voltage-free. An “at least substantially voltage-free switching process”, which is also known by the English term “zero voltage switching (ZVS)”, is to be understood in particular as a soft switching process in which a voltage that is particularly applied to the branch switching unit and / or falls, at least essentially vanishingly small, in particular essentially zero. A “vanishingly low value” is to be understood in particular as a value which is in particular at least a factor 10, advantageously a factor 50, preferably a factor 100 and particularly preferably a factor 500 lower than a maximum operating value.

A “control unit” is to be understood in particular as an electronic unit that is preferably at least partially integrated in a control and / or regulating unit of a cooking appliance. The control unit preferably comprises a computing unit and, in particular, in addition to the computing unit, a memory unit with a control and / or regulating program stored therein which is provided to be executed by the computing unit. A “switching parameter set” is to be understood as meaning, in particular, a set of at least one switching parameter and preferably a plurality of switching parameters. In particular, a set of switching parameters is involved at least one switching parameter belonging to a heating branch. A “switching parameter” is to be understood in particular as a parameter which, when the switching unit is in operation, is directly in the area of influence of the control unit and / or can be controlled and / or regulated by the latter. As an alternative or in addition, the switching parameter can lie within the sphere of influence of a user and thus be controlled and / or selected indirectly or directly by a user.

“Provided” is to be understood in particular as specifically programmed, designed and / or equipped. The fact that an object is provided for a specific function is to be understood in particular to mean that the object fulfills and / or executes this specific function in at least one application and / or operating state. An “operating state” should in particular be understood to mean a state of the cooking device device in which at least one of the heating branches is operated.

It is also proposed that the control unit operate the branch switching units of the heating branches to be operated periodically with a common period. In this way, in particular, a particularly efficient cooking appliance device can be provided. The period of one of the branch switching units with the common period can, for example, start at a different point in time than the period of another of the branch switching units with the common period. However, the periods preferably start at the same time. A “period duration” is to be understood in particular as a reciprocal value of a frequency with which one of the branch switching units and / or the common switching unit switches. The fact that the control unit “operates the branch switching units of the heating branches to be operated each with a common period duration” is to be understood in particular as meaning that the period durations with which the branch switching units are operated are the same.

For example, in the operating state, the control unit could operate the common switching unit periodically with a different period than the branch switching units, in particular with any period duration. If the control unit operates the common switching unit periodically with the common period in the operating state, a particularly efficient cooking appliance device can be provided. Since a setting of a heating power of a heating branch to be operated can take place in particular special parameters that are independent of a switching frequency and so that in particular can be independent of the common period, the common period can be chosen to be constant and as efficient as possible. The cooking appliance device is particularly efficient if the common period duration corresponds at least essentially to a reciprocal value of a resonance frequency of an oscillating circuit with conventionally set up cooking utensils. If the switching frequency, ie the reciprocal of the common period, corresponds at least essentially to the resonance frequency, switching losses are minimal. The switching frequency is particularly preferably in the range from 20 kHz to 35 kHz, which corresponds to a common period of 0.05 ms to 0.029 ms. During a first period segment of the common period duration, in particular the common switching unit is switched on and all branch switching units are switched to be separating. In particular, a duration of the first period segment corresponds to at least substantially one half of the common period duration. The duration of the first period segment should preferably be selected so that the nominal output is higher than or equal to the desired heating output of one of the heating branches to be operated. During a second period segment of the common period duration, the common switching unit, in particular, is switched to isolate. In an operating state, depending on the switching parameter set of the branch switching unit of the heating branches to be operated, the branch switching unit of at least one heating branch to be operated is at least partially switched on within the second period section of the common period duration. The duration of the second period segment corresponds in particular to the common period duration minus the duration of the first period segment.

If the switching parameter set includes at least one switch-on time of the branch switching unit of the at least one heating branch to be operated, a particularly flexible control of the heating power of the cooking appliance device, in particular of the at least one heating branch to be operated, can take place. In particular, a period-related time interval between a passage time span of the common switching unit and a passage time span of a branch switching unit can be changed in a targeted manner. By specifically changing the switch-on time of the branch switching unit of the at least one heating branch to be operated, in particular a heating power of the heating branch to be operated can be influenced. Preferably, by increasing the period-related time interval between a passage time span of the common switching unit and a passage time period of a branch switching unit, a heating power can be reduced.

A "passage time period" of the branch switching unit and / or the common switching unit is to be understood in particular as a period of time during which a first and a second main contact of the branch switching unit and / or the common switching unit are connected in an electrically conductive manner. A "main contact" of the branch switching unit and / or the common switching unit is to be understood in particular as a contact of the branch switching unit and / or the common switching unit which is used to conduct a current to a consumer unit that is separate from the branch switching unit and / or the common switching unit is designed, is provided. A "time interval between a first passage time span and a second passage time span" should in particular be understood to mean a duration of a time span which begins with an end of that of the passage time spans which expires earlier and with a beginning of that of the passage Periods of time that begin later ends. A “period-related time interval” is to be understood in particular as a duration of a time interval divided by the period duration.

It is also proposed that the switching parameter set include at least one switch-on duration of the branch switching unit of the at least one heating branch to be operated. In this way, particularly flexible control of the heating power of the cooking appliance device, in particular of the at least one heating branch to be operated, can take place. In particular, the “switch-on duration of the branch switching unit of the at least one heating branch to be operated” is to be understood as a period-related passage time span of the branch switching unit. Advantageously, this is to be understood as a time span within the second period segment of the common period duration, during which the branch switching unit is switched on. In particular, by changing the switch-on duration of the branch switching unit of the at least one heating branch to be operated, the heating power of the heating branch can be changed. Preferably, a heating power can be reduced by reducing the switch-on duration of the branch switching unit of the at least one heating branch to be operated.

In particular, the heating power of a heating branch can be controlled and / or regulated by changing, in particular, a plurality of switching parameters. For example the heating output of a heating branch can be achieved by a combined change in the switch-on time of the branch switching unit of the at least one heating branch to be operated and the switch-on duration of the branch switching unit of the at least one heating branch to be operated. Alternatively or additionally, a change in an individual switching parameter could regulate the heating output of a heating branch.

For example, the control unit could operate and / or control all branch switching units with a single common switching parameter set. However, it is proposed that the control unit operate and / or control each of the branch switching units with its own set of switching parameters. This allows a particularly flexible setting of the heating power. In particular, a high level of efficiency can be achieved in this way. In particular, the switching parameters of one switching parameter set can assume different values from the switching parameters of another switching parameter set. It is also conceivable that the switching parameters of one switching parameter set assume the same values as the switching parameters of another switching parameter set. In particular, all switching parameter sets include the same switching parameters. It is also conceivable that the switching parameter sets differ from one another in terms of the range of switching parameters.

It is also proposed that the heating branches each have at least one branch diode which blocks the heating branches from one another. This enables in particular an independent power setting for the heating branches. For example, a current flow, in particular a potential flow between the heating branches, could not be prevented in any direction. The fact that the branch diode “blocks the heating branches with respect to one another” is to be understood in particular to mean that the two-diode prevents a current flow from one heating branch to another heating branch. This means in particular that the branch diode prevents a backflow and thus in particular an outflow of an electrical potential of one heating branch via another heating branch.

If the branch diodes, viewed from the common switching unit, are each arranged in front of the associated branch switching units, the heating branches can be blocked from one another in a particularly effective manner. It is further proposed that the heating branches each have at least one resonance unit which, with the associated heating units, in particular induction heating units, are part of an oscillating circuit. In particular, for example, cooking utensils and / or a cooking muffle wall can also be part of the oscillating circuit. A “resonance unit” is to be understood in particular as a unit that comprises at least one resonance capacitance, which is preferably formed by at least one capacitor, which is preferably different from a damping capacitance and / or a capacitance that is connected in parallel to a switching element. In particular, a resonance capacitance is formed from a combination of series and parallel connections of several capacitors. The resonance capacitance is, in particular, a component of an electrical oscillating circuit, in particular an electrical series oscillating circuit. The resonance capacitance is preferably connected in series with the heating unit in at least one operating state, in particular via one of the branch switching units and / or the common switching unit, and is particularly advantageously provided to be charged via the heating unit, in particular when the heating unit is switched through the branch switching unit and / or the common switching unit is placed on a higher electrical potential. The resonance capacitance is arranged in particular on a side of the heating unit that faces away from the common switching unit when viewed in the direction of a line path. For example, the resonance unit could be dimensioned such that the resonance frequency of the resonant circuit with conventional cookware is less than 25 kHz or more than 35 kHz. The resonance frequency of the resonant circuit with conventional cooking utensils is preferably 25 kHz to 35 kHz, which means that acoustic noise and / or large power losses, in particular switching losses, can be avoided.

The common switching unit could have exactly one switching element. However, the common switching unit advantageously has at least two switching elements connected in parallel. In particular, the control unit can be provided to switch the two switching elements connected in parallel at the same time or alternately, in particular in order to thereby distribute a thermal load on the two switching elements.

For example, the cooking appliance device could have a cooling unit which cools the common switching unit and the individual branch switching units equally. Alternatively, the cooling unit could cool the individual branch switching units more than that common switching unit. If the cooking appliance device has a cooling unit which cools the common switching unit more than the individual branch switching units, a load on the common switching unit can in particular be reduced. In particular, a service life of the cooking appliance device can thereby be lengthened, whereby user-friendliness in particular can be increased. A “cooling unit” is to be understood in particular as a unit which is specifically designed to cool further components, in particular an electronics unit, and which is in particular in thermal and preferably in direct mechanical contact with these components. The cooling unit has a surface area that is at least 5 times, in particular at least 10 times, advantageously at least 20 times and particularly advantageously at least 50 times larger than a cube of the same volume and in particular comprises at least 3, in particular at least 10 and advantageously at least 20 cooling fins. Alternatively or additionally, the cooling unit could, for example, comprise a Peltier element.

It is also proposed that the cooking appliance device has a plurality of at least two further heating branches, each of which includes at least one further heating unit and at least one further branch switching unit, with a further switching unit common to the further heating branches, the control unit in an operating state for setting a Heating power at least one of the further heating branches to be operated adapts at least one further switching parameter of a further switching parameter set of the further branch switching unit of the at least one further heating branch to be operated. A cooking appliance device with particularly high flexibility can be provided by such a configuration. In particular, the heating branches to be operated are independent of the other heating branches to be operated. In this way, for example, a matrix hob can be provided with a plurality of mutually independent matrix areas. In particular, the mutually independent matrix areas can have a different nominal power, whereby flexibility is particularly increased. In particular, a larger range of possible heating outputs can be achieved in this way.

Furthermore, a hob, in particular a matrix hob, with at least one Garge device device is proposed. An efficiency, in particular an energy efficiency and / or a component efficiency, can in particular be further increased by a method for operating a cooking device with a plurality of at least two heating branches, each of which includes at least one heating unit and at least one branch switching unit, and one for the Switching unit common to heating branches, in which for setting a heating power at least one of the heating branches to be operated at least one switching parameter of a switching parameter set of the branch switching unit of the at least one heating branch to be operated is adapted.

The cooking appliance device is not intended to be restricted to the application and embodiment described above. In particular, the cooking appliance device can have a number of individual elements, components and units that differs from a number of individual elements, components and units mentioned herein in order to fulfill a mode of operation described herein.

Further advantages emerge from the following description of the drawings. In the drawing voltage, embodiments of the invention are shown. The drawing, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.

Show it:

1 shows a cooking appliance designed as a hob with a cooking appliance device in a schematic top view,

2 shows a schematic circuit diagram of part of the cooking appliance device with three heating branches,

3 switching and voltage states of a common switching unit of the cooking appliance device and of two branch switching units of the cooking appliance device based on an exemplary set of switching parameters,

4 shows a diagram with an exemplary performance curve of one of the heating branches as a function of a switch-on time of a branch switching unit of the heating branch, Fig. 5 is a diagram with an exemplary performance curve of one of the heating branches as a function of a duty cycle of a Zweigschaltein unit of the heating branch,

6 shows a diagram with an exemplary power curve of one of the heating branches as a function of a switch-on time with a constant switch-on duration of a branch switching unit of the heating branch,

7 shows diagrams with exemplary current and voltage curves for a reference heating output and for two heating outputs adapted by means of a set of switching parameters,

8 shows diagrams with exemplary current and voltage curves for the reference heating output and for two further heating outputs adapted by means of a set of switching parameters,

9 shows diagrams with exemplary current and voltage curves for the reference heating output and for a heating output adapted by means of a set of switching parameters,

10 is a schematic circuit diagram of part of a further embodiment of a cooking appliance device,

11 shows a cooking appliance designed as a matrix hob with an alternative exemplary embodiment of a cooking appliance device in a schematic plan view, and FIG

FIG. 12 is a schematic circuit diagram of part of the cooking appliance device from FIG. 11.

In the figures, only one object of multiple existing objects is provided with a reference symbol.

FIG. 1 shows a cooking appliance designed as a hob 32a, which in the example shown is designed as an induction hob. The hob 32a has a cooking appliance device 10a designed as a hob device, parts of which are shown in more detail in FIG.

The cooking appliance device 10a has a plurality of heating branches 12a. In the example shown, the cooking device device 10a has four heating branches 12a, one for each heating zone 70a of the cooking device device 10a. Alternatively, the cooking appliance Device 10a also have a different number of heating branches 12a and / or heating zones 70a.

The cooking appliance device 10a has a switching unit 18a that is common to the heating branches 12a. In the example shown, the common switching unit 18a has a switching element 38a. The switching element 38a is designed as a bipolar transistor. A collector of the common switching unit 18a is connected to a bus potential 62a. The bus potential 62a is one of the rectified busbars of a rectifier of the cooking appliance device 10a (not shown). An emitter of the common switching unit 18a is connected to the plurality of heating branches 12a.

Each of the heating branches 12a has a heating unit 14a and a branch switching unit 16a. The heating unit 14a is designed as an induction heating unit. A first connection of the heating unit 14a is connected to a resonance unit 36a of the respective heating branch 12a. The resonance unit 36a forms part of an oscillating circuit with the associated heating unit 14a. The resonance unit 36a has two capacitors 52a. In each case one connection of a capacitor 52a is connected to the heating unit 14a. Another connection of the capacitor 52a is each connected to the bus potential 62a or a ground potential 64a. The ground potential 64a is the potential of a further rectified busbar of the rectifier of the cooking appliance device 10a (not shown).

A second connection of the heating unit 14a is connected to the branch switching unit 16a. The branch switching unit 16a comprises a bipolar transistor and a parallel-connected branch switching diode 54a. An emitter of the transistor of the branch switching unit 16a is connected to the parallel-connected branch switching diode 54a and to the heating unit 14a. A collector of the transistor of the branch switching unit 16a is connected to the parallel-connected branch switching diode 54a and to the ground potential 64a.

A diode 56a of each heating branch 12a connected in parallel to the common switching unit 18a is connected at its anode to the second connection of the heating unit 14a. The parallel-connected diode 56a is connected to the bus potential 62a by its cathode. A branch diode 30a of the heating branch 12a is also connected to the second connection of the heating unit 14a. The branch diode 30a, viewed from the common switching unit 18a, is arranged in front of the associated branch switching units 16a. The branch diode 30a has its cathode connected to the second connection of the heating unit 14a. The anode of the branch diode 30a is connected to the common switching unit 18a. The branch diode 30a blocks the heating branches 12a to one another and prevents an undesired flow of potential from one of the heating branches 12a to another heating branch 12a.

The branch switching units 16a and the common switching unit 18a are cooled, which is shown schematically in FIG. 2 by the respective waste heat 58a. The cooking appliance device 10a has a cooling unit 40a for cooling the common switching unit 18a and the branch switching units 16a, which cools the common switching unit 18a more than the individual branch switching units 16a (shown schematically by means of waste heat 58a). The cooling unit 40a has, for example, a heat sink (not shown) for the common switching unit 18a and the branch switching units 16a. As an alternative or in addition, the cooling unit 40a could comprise a fan which, for example, provides convection on all heat sinks and / or on all branch switching units 16a and the common switching unit 18a.

The cooking appliance device 10a also has a control unit 20a, which is also shown schematically in FIG.

The control unit 20a operates the branch switching units 16a of the heating branches 12a to be operated in an operating state, in each case periodically with a common period 28a. In the operating state, the control unit 20a also operates the common switching unit 18a periodically with the common period duration 28a.

FIG. 3 shows exemplary switching states within the common period 28a on the basis of an exemplary switching parameter set using the example of the common switching unit 18a and of two branch switching units 16a. The curve VSH shows the time span in which the common switching unit 18a periodically lets through the bus potential 62a common to all heating branches 12a with the common period duration 28a. To set a heating power 60a of the heating branches 12a to be operated in an operating state, the control unit 20a adapts two switching parameters 22a of a switching parameter set of the branch switching unit 16a of a heating branch 12a to be operated. The heating power 60a of a heating branch 12a to be operated corresponds to the heating power 60a of the heating unit 14a of the heating branch 12a to be operated. The control unit 20a operates all branch switching units 16a with their own switching parameter set. In the example shown, the common period 28a for the illustrated switching states of the two branch switching units 16a begins simultaneously.

The switching parameter set comprises a switch-on time 24a of the branch switching unit 16a of the heating branch 12a to be operated. The switching parameter set also includes a switch-on duration 26a of the branch switching unit 16a of the heating branch 12a to be operated. The heating power 60a is set by changing the switch-on time 24a and the switch-on duration 26a.

The curves Vsu and Vsi_2 show the respective switch-on times 26a of the branch switching units 16a of heating branches 12a to be operated, in which the branch switching unit 16a periodically lets through the ground potential 64a with the common period 28a. The switch-on duration 26a begins periodically at the switch-on time 24a.

The common period 28a is in the range from 0.01 ms to 0.05 ms. The duty cycle 26a of the respective branch switching units 16a of the heating branches 12a to be operated is in the range from 0.005 ms to 0.025 ms. The switch-on duration 26a of the branch switching unit 16a can correspond at most to the common period duration 28a, minus the passage time span of the common switching unit 18a. A shorter switch-on duration 26a of the branch switching unit 16a reduces the heating power 60a. The relationship between the switch-on duration 26a of the branch switching unit 16a, the switch-on time 24a of the branch switching unit 16a and the heating power 60a of the heating branch 12a is shown in greater detail in FIGS.

A later switch-on time 24a of the branch switching unit 16a corresponds to a larger period-related time interval between a passage time period of the common switching unit 18a and a passage time period of the branch switching unit 16a. The greater period-related time interval between the passage time span of the common switching unit 18a and the passage time span of the branch switching unit 16a results in a reduced heating power 60a of the heating branch 12a as soon as the period-related time interval is greater than a switching time of the common switching unit 18a and / or the respective branch switching unit 16a.

FIG. 4 shows, by way of example, the relationship between the heating power 60a in watts, which is shown on an ordinate in FIG. 4, as a function of the switch-on time 24a, which is shown on an abscissa in FIG. Depending on the desired heating power 60a, the control unit 20a can select the switch-on time 24a in a range of half a common period duration 28 minus the switch-on duration 26a. In Figure 4, the possible range of the switch-on time 24a of half a common period 28a is shown as a phase angle from 0 ° to 180 ° on the abscissa. The heating power 60a can be reduced by changing the switch-on time 24a, starting from a maximum heating power 60a at low phase angles, down to a value of 0 W at phase angles close to 180 °.

FIG. 5 shows, by way of example, the relationship between the heating power 60a in watts, which is shown on an ordinate in FIG. 5, as a function of the switch-on duration 26a, which is shown on an abscissa in FIG. Depending on the desired heating power 60a, the control unit 20a can adjust the switch-on duration 26a in a range of up to half a common period 28, which corresponds to a maximum possible period-related transmission time span of the branch switching unit 16a. In FIG. 5, the possible range of the on-time 26a of half a common period 28a is shown as a phase angle of 0 ° to 180 ° on the abscissa.

The relationship therefore applies that the on-time 26a is equal to or less than half the common period 28a minus the period-related time interval between a passage time period of the common switching unit 18a and a passage time period of the branch switching unit 16a. For a constant switch-on duration 26a selected as an example, FIG. 6 shows the heating power 60a of a heating branch 12a resulting from the switch-on time 24a. With constant switch-on duration 26a and change in switch-on time 24a in a certain range, at least one substantially constant heating power 60 can be achieved. In this way, in particular, a high degree of flexibility can be achieved, in particular when there are a plurality of heating branches 12a to be operated. In particular, this makes it possible to achieve improved efficiency, in particular with regard to the controllability of the voltages and the switching losses.

Figures 7a and 8a show an example of a voltage and current curve for a reduced heating power 68a on a heating branch 12a of 1400 W, for example, and for a reference heating power 66a on another heating branch 12a of 1800 W. In addition, they are within the common period 28a represented by the common switching unit 18a and the respective branch switching unit 16a switched potentials.

FIGS. 7b and 8b show the exemplary voltage and current curve for the reduced heating power 68a on one heating branch 12a of, for example, 1000 W and for the reference heating power 66a on another heating branch 12a of 1800 W.

FIGS. 9a and 9b show two different exemplary voltage and current curves for the reduced heating power 68a on two heating branches 12a of, for example, 1400 W and for the reference heating power 66a on another heating branch 12a of 1800 W.

The voltage and current curves shown in FIGS. 7a and 7b, 8a and 8b as well as 9a and 9b for the respective heating power 60a are each based on the same common period duration 28a.

Two further exemplary embodiments of the invention are shown in FIGS. 10 to 12. The following descriptions are essentially limited to the differences between the exemplary embodiments, reference being made to the description of the other exemplary embodiments, in particular FIGS. 1 to 9, with regard to components, features and functions that remain the same. To distinguish the exemplary embodiments, the letter a in the reference symbols of the exemplary embodiment in FIGS. 1 to 9 is replaced by the letters b and c in the reference symbols in the exemplary embodiments in FIGS. 10 to 12. With regard to components with the same designation, in particular with regard to components with the same reference symbols, in principle it is also possible to refer to Drawings and / or the description of the other exemplary embodiments, in particular of FIGS. 1 to 9, are referred to.

FIG. 10 shows part of a cooking appliance device 10b. A common switching unit 18b here has two switching elements 38b connected in parallel. A control unit 20b is provided to switch the switching elements 38b at the same time in order to reduce a thermal load on the switching elements 38b in each case and to increase their service life. Alternatively, it would be conceivable that the control unit 20b is provided to switch the switching elements 38b alternately, whereby the respective thermal load can also be reduced.

Figures 11 and 12 show a cooking device designed as a hob 32c with a cooking device device 10c. The hob 32c is designed as a matrix hob. The cooking appliance device 10c has a first group 72c of heating units 14c and a second group 74c of further heating units 44c. In the example shown, each of the groups 72c and 74c has 24 heating units 14c and further heating units 44c.

Analogously to the previous exemplary embodiments, the cooking appliance device 10c has a plurality of heating branches 12c. The heating units 14c of the first group 72c are part of the heating branches 12c. The cooking appliance device 10c has a plurality of further heating branches 42c. The further heating branches 42c each have one of the further heating units 44c, which are part of the second group 74c.

Furthermore, the further heating branches 42c each include a further branch switching unit 46c. The cooking appliance device 10c comprises a further switching unit 48c which is common to the further heating branches 42c.

In an operating state for setting a heating power 60c, a control unit 20c adjusts at least one of the further heating branches 42c to be operated at least one further switching parameter 22c of a further switching parameter set of the further branch switching unit 46c of the at least one further heating branch 42c to be operated.

The number of groups of heating units 14c and / or further heating units 44c can in particular differ from the number shown in this example, in particular The cooking appliance device 10c can have any number of groups 72c, 74c of heating units 14c and / or further heating units 44c. The number of heating units 14c and / or further heating units 44c, which together form a group 72c, 74c, can in particular differ from the number shown in this example; in particular, a group 72c, 74c can have any number of heating units 14c and / or more Have heating units 44c. Furthermore, the groups 72c, 74c of heating units 14c and / or further heating units 44c can differ from one another by a different number of heating units 14c and / or further heating units 44c. In addition, an arrangement of groups 72, 74c and / or an arrangement of heating units 14c and / or further heating units 44c can differ.

Reference number

10 Cooking device device

12 heating branch

14 heating unit

16 branch switching unit

18 Common switching unit

20 control unit

22 Switching parameters

24 Switch-on time

26 duty cycle

28 Common period duration

30 branch diode

32 hob

36 resonance unit

38 switching element

40 cooling unit

42 Another heating branch

44 Additional heating unit

46 Further branch switching unit

48 Common additional switching unit

52 condenser

54 Branch switching diode connected in parallel

56 Diode connected in parallel

58 waste heat

60 heating power

62 bus potential

64 ground potential

66 Reference heating output Reduced heating output Heating zone First group Second group

Claims

PATENT CLAIMS

1. Cooking device device (10a-c), in particular hob device, with a plurality of at least two heating branches (12a-c), each of which comprises at least one heating unit (14a-c) and at least one branch switching unit (16a-c), with one for the heating branches (12a-c) common switching unit (18a-c) and with at least one control unit (20a-c), which in an operating state for setting a heating power at least one of the heating branches (12a-c) to be operated at least one switching parameter ( 22a-c) adapts a switching parameter set of the branch switching unit (16a-c) of the at least one heating branch (12a-c) to be operated.

2. Cooking device device (10a-c), in particular hob device, according to claim

1, characterized in that the control unit (20a-c) operates the branch switching units (16a-c) of the heating branches (12a-c) to be operated, each periodically with a common period (28a-c).

3. Cooking device device (10a-c), in particular hob device, according to claim

2, characterized in that the control unit (20a-c) in the operational state operates the common switching unit (18a-c) periodically with the common period duration (28a-c).

4. Cooking device device (10a-c), in particular hob device, according to one of the preceding claims, characterized in that the switching parameter set includes at least one switch-on time (24a-c) of the branch switching unit (16a-c) of the at least one heating branch to be operated (12a-c ) includes.

5. Cooking device device (10a-c), in particular hob device, according to one of the preceding claims, characterized in that the switching parameters include at least one switch-on period (26a-c) of the branch switching unit (16a-c) of the at least one heating branch to be operated (12a-c ) includes.

6. Cooking device device (10a-c), in particular hob device, according to one of the preceding claims, characterized in that the control unit (20a-c) operates all branch switching units (16a-c) with its own set of switching parameters.

7. Cooking device device (10a-c), in particular hob device, according to one of the preceding claims, characterized in that the heating branches (12a-c) each have at least one branch diode (30a-c), which branches the heating (12a-c) to one another locks.

8. Cooking device device (10a-c), in particular hob device, according to claim 7, characterized in that the branch diodes (30a-c) viewed from the common switching unit (18a-c) in each case in front of the associated branch switching units (16a-c) are arranged.

9. Cooking device device (10a-c), in particular hob device, according to one of the preceding claims, characterized in that the heating branches (12a-c) each have at least one resonance unit (36a-c) which is connected to the associated heating units (14a-c) Are part of an oscillating circuit.

10. Cooking appliance device (10b), in particular hob device, according to one of the preceding claims, characterized in that the common switching unit (18b) has at least two switching elements (38b) connected in parallel.

11. Cooking device device (10a-c), in particular hob device, according to one of the preceding claims, characterized by a cooling unit (40a-c) which cools the common switching unit (18a-c) more than the individual branch switching units (16a-c).

12. Cooking appliance device (10c), in particular hob device, according to one of the preceding claims, characterized by a plurality of at least two further heating branches (42c), each of which comprises at least one further heating unit (44c) and at least one further branch switching unit (46c), and a further switching unit (48c) common to the further heating branches (42c), the control unit (20c) in an operating state for setting a heating power of at least one of the further heating branches (42c) to be operated at least one further switching parameter of a further switching parameter set of the further branch switching unit (46c) of the at least one further heating branch (42c) to be operated.

13. Cooking device, in particular hob (32a-c), with at least one Gargerätevorrich device (10a-c) according to one of the preceding claims.

14. A method for operating a cooking appliance device (10a-c), in particular a cooking field device, in particular according to one of claims 1 to 12, with a plurality of at least two heating branches (12a-c), each of which has at least one heating unit (14a-c) and at least one branch switching unit (16a-c), and with a switching unit (18a-c) common to the heating branches (12a-c), in which at least one of the heating branches (12a-c) to be operated is set at least one switching parameter (22a-c) a set of switching parameters of the branch switching unit (16a-c) of the at least one heating branch (12a-c) to be operated is adapted.