EP2034800B1 - Cooking device switch - Google Patents

Description

The invention is based on a cooking device circuit according to the preamble of claim 1.

There is known a cooking apparatus comprising a cooking plate for laying a preparation utensil and a set of induction coils forming a contiguous cooking area of the cooking plate. The heating of the preparation harness is carried out by means of a heating group of induction coils, which is formed depending on a selection position of the preparation dishes in the cooking area.

The object of the invention is, in particular, to provide a cooking device circuit for a generic cooking device with improved properties in terms of effective heating operation with a heating group.

The object is achieved by the features of claim 1, while advantageous embodiments and modifications of the invention can be taken from the dependent claims.

The invention is based on a cooking device circuit having a plurality of heating units and a heating group formation unit, which is provided to form a heating group of heating units adapted to a selection position of a preparation tableware.

It is proposed that the cooking device circuit has a synchronization unit which is provided to synchronize at least two heating units with each other. It can thereby be an effective heating operation, which is carried out by means of the synchronized heating units, can be achieved. In particular, in a heating operation of a heating group formed by means of the heating group formation unit advantageously a time reference for the heating group can be created.

In this context, a "heating unit" is to be understood as meaning, in particular, a unit which is provided for the purpose of transmitting a heat energy to a preparation tableware. For this purpose, the heating unit has at least one heating body, which may be e.g. is designed as an inductive heating means or as a radiation body. In a heating unit power operation, a heating unit for transmitting the heating energy is expediently supplied with electric power by means of a power unit.

A "selection position" is to be understood, in particular, as a position of the preparation utensil that can be arbitrarily selected by an operator within a continuous cooking area for heating a preparation utensil. A "cooking area for heating a cooking utensil" is to be understood in this context, in particular a range of cooking appliance, which is suitable for a cooking operation of the cooking utensil. The cooking area preferably corresponds to a portion of a cooking plate of the cooking device, which is stretched by all the heating units. In contrast to a cooking appliance with separate cooking zones in which a space between the cooking zones is unsuitable for cooking, the cooking area coherently constitutes a substantial part, in particular more than 50%, advantageously more than 75% and preferably more than 90% of the total surface the hotplate, which is suitable for a cooking operation, whereby a particularly high degree of flexibility in the choice of a cooking position of the cooking utensil can be achieved. In order to achieve a large cooking area, the cooking device circuit preferably has at least 10, advantageously at least 20 and preferably at least 40 heating units. The heating group formation unit is provided in particular for forming the heating group of heating units for heating the preparation tableware in a selection position of the preparation tableware in the cooking area. A position of the cooking utensil "in the cooking area" is to be understood in particular to mean a position of the cooking utensil relative to the cooking area in which the cooking utensil floor is arranged completely in the cooking area.

A "synchronization" of two heating units in this context should be understood in particular to mean a process in which a relative phase relationship between a periodic process, which is carried out with a first heating unit, and a periodic process, which is carried out with a second heating unit at least one time a desired value is assigned. In particular, the Synchronization unit designed so that at the time the relative phase position reaches the zero value. The periodic processes of the heating units are typically carried out each time by means of a timing unit. If a clocking unit for the first heating unit is independent of a clocking unit for the second heating unit, the synchronization unit can advantageously reduce a phase shift between the periodic processes, which can occur due to deviations in the timing of the various clocking units. By periodically carrying out a synchronization process with a synchronization frequency, a significant deviation of the relative phase angle from a desired value can be avoided since a common time reference for the heating units can be created. If the heating units each have an inductive heating means, in a heating operation the heating units are preferably supplied with an alternating current, the synchronization unit preferably serving to set the relative phase position of two alternating currents for supplying the heating units to a predetermined value, in particular to zero to put. As a result, mutual disturbances of the heating units, which are caused due to a magnetic coupling between the heating means, can be advantageously reduced.

It is also proposed that the synchronization unit is provided to synchronize heating units, in particular all heating units of a heating group formed, with each other, whereby in a heating operation of the heating group unwanted mutual disturbances of the heating units can be reduced.

In a preferred embodiment of the invention, it is proposed that the cooking device circuit comprises a plurality of heating modules, the heating modules each having at least one heating unit and each having a different heating module control unit for controlling the heating unit. In this connection, a structurally simple cooking device circuit can be achieved if the heating modules each have a heating module group of heating units and a respective different heating module control unit for controlling the heating module group. To supply one or more heating units of a heating module, a heating module preferably comprises in each case at least one power unit which is provided for supplying at least one heating unit with power. In particular, a different power unit can be provided for each heating unit in a heating module. Includes the heating unit at least one Inductive heating means, the power unit preferably has an inverter with switching means, such as transistors, which provides by means of switching operations of the switching means in a known manner a heating power for the heating means. In this case, in a heating module, the respective heating module control unit advantageously serves to control switching operations of at least one power unit. The various heating modules with their respective heating module control unit are in particular each arranged on a different printed circuit board. In this case, in the case of a heating module, the respective heating module control unit and preferably power units for supplying power to the respective heating module group are advantageously arranged on a common printed circuit board. The cooking device circuit has a total number of heating units, wherein the heating module groups in cooperation preferably form this total number. A heating group formed by means of the heating group formation unit is typically composed of heating units that belong to different heating modules.

In addition, it is proposed that the synchronization unit has a timing unit which is designed differently from the heating modules. If a heating group is formed by means of the heating group formation unit, one of the heating module control units preferably serves as a heating group line unit which is provided for controlling a heating operation of the heating group. Various heating module control units may be designed as a heating group line unit in various cooking operations of a cooking device. Furthermore, two heating groups can be formed for simultaneously heating two preparation utensils, wherein the heating groups are preferably controlled by a different heating group conduction unit. Since neither the number of heating groups to be operated nor their position in the cooking area, nor the choice of one or more Heizgruppenleitungseinheiten can be predicted, in this context, one of the heating modules separately running timing unit, which regardless of the composition of the heating group or heating groups and whose position in the cooking area can perform a clocking process.

In a preferred embodiment, it is proposed that the synchronization unit has a clocking unit which is provided to supply the heating modules in parallel with a clocking signal, whereby a particularly fast supply of the heating modules can be achieved with the clocking signal, since the heating modules simultaneously supply the clocking signal can be. Under a "parallel Supply "of two heating modules should be understood a supply in which for each heating module, an electrical connection of this heating module is made to a clocking means of the clocking unit, wherein the course of the electrical connection is formed differently from the other heating module.

In an advantageous development of the invention, it is proposed that the heating modules each have a Heizmodultaktgebungseinheit for generating a Heizmodultaktgebungssignals for a control process of the heating module and the synchronization unit comprises a clocking unit for generating a timing signal for at least two different Heizmodultaktgebungseinheiten, whereby a particularly simple design Kochvorrichtungsschaltung can be achieved , The heating module timing units may be e.g. be designed as an internal clock. If the heating modules each have power units for generating power by means of switching operations, then the respective heating module clocking unit advantageously provides a time reference which is internal to the heating module and which can be used to carry out the switching operations. It is advantageous if the Heizmodultaktgebungseinheit a heating module is formed as part of the respective Heizmodulesteuereinheit.

In this context, it is proposed that the timing signal be used to synchronize at least two Heizmodultaktgebungseinheiten, whereby a favorable regular synchronization of internal to the various heating modules time references can be achieved.

Advantageously, the synchronization unit is provided to synchronize at least two heating units of different heating modules with each other, whereby significant phase shifts between heating units can be avoided. Various Heizmodultaktgebungseinheiten can particularly easily form the synchronization unit in cooperation with a heating modules superordinate clocking unit, by means of which heating units of different heating modules can be synchronized with each other.

It is also proposed that the synchronization unit is intended to synchronize at least two heating units during a synchronization period. This can be advantageous in contrast to one by means of an electrical pulse achieved synchronization process, a continuous transition to a synchronized operation of the heating units can be achieved, whereby unwanted interference frequencies can be avoided in the transition. This can be achieved particularly easily if, in an operating mode, a heating unit serves to generate a heating signal with a heating frequency and the synchronization unit is provided to change the heating frequency during the synchronization period.

In a preferred embodiment of the invention it is proposed that the synchronization unit has a timing unit which is provided to generate a timing signal in response to a mains power supply parameter, whereby a clocking can be achieved by simple means. In particular, the mains power supply parameter can be designed as a mains voltage. Furthermore, a particularly effective timing can be achieved if the clocking unit is intended to generate the clocking signal by means of a zero point of the mains power supply parameter. If the mains power supply characteristic is designed as a mains voltage, inrush pulses can advantageously be reduced by synchronization at a zero point of the mains voltage. A "zero point" of a parameter may, in particular, be understood as an interval centered around a zero value of the parameter whose upper limit is in particular at most 10%, advantageously at most 5% and preferably at most 1% of the maximum amplitude of the parameter.

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

Fig. 1

eine Induktionskochvorrichtung mit einem Satz von Induktoren in einer Ansicht von oben,

Fig. 2

eine interne Schaltung der Induktionskochvorrichtung aus Figur 1 mit einer Synchronisationseinheit und einer Heizgruppenbildungseinheit zur Bildung von Heizgruppen,

Fig. 3

die Anordnung der Induktoren mit gebildeten Heizgruppen zum Erwärmen von zwei Zubereitungsgeschirren,

Fig. 4

das Erzeugen eines Taktgebungssignals für die Synchronisationseinheit mittels einer Netzstromversorgungssignals,

Fig. 5

einen Synchronisiervorgang von drei Induktorströmen und

Fig. 6

einen alternativen, kontinuierlichen Synchronisiervorgang von drei Induktorströmen.

Show it:

Fig. 1

an induction cooking apparatus with a set of inductors in a top view,

Fig. 2

an internal circuit of the induction cooking from FIG. 1 with a synchronization unit and a heating group formation unit for forming heating groups,

Fig. 3

the arrangement of the inductors with heating groups formed for heating two cooking utensils,

Fig. 4

generating a timing signal for the synchronization unit by means of a mains power signal,

Fig. 5

a Synchronisiervorgang of three inductor currents and

Fig. 6

an alternative, continuous synchronization of three inductor currents.

FIG. 1 shows a trained as an induction cooktop cooking device 10. The cooking device 10 has a mounting frame 12 for attachment to a countertop, a cooking plate 14 for placing cookware and a control panel 16 for starting, stopping and setting a heating operation. Two cooking utensils 18, 20 designed as a pot are arranged on the cooking plate 14, of which in each case a preparation dish bottom is represented schematically by a continuous circular line. To carry out a cooking operation of the cooking device 10, this is provided with a group of heating units 22, each comprising a trained as an induction coil heater 24. The arrangement of the radiator 24, which are shown schematically in the figure by a dashed rectangle, is designed as a matrix arrangement. This radiator 24 different columns and different rows are covered by the preparation dishes 18. In the embodiment shown, a group of 48 heating units 22, each with a radiator 24 is shown by way of example. Further embodiments of the cooking device 10 are each possible with a different number of heating units 22.

In an operation of a heating unit 22, a heating signal H designed as a magnetic alternating field is generated by the corresponding heating element 24 (see FIG FIG. 2 ), which has a heating frequency f _H. The heating signal H induces electrical currents in the metallic bottom of the preparation harnesses 18, 20. These electrical currents heat up due to ohmic losses in the preparation dishes 18, 20 food. A radiator 24 in operation of the corresponding heating unit 22 is supplied to generate the heating signal H with an alternating electrical current which oscillates at the heating frequency f _H (see Figures 5 and 6 ). To generate this alternating current are designed as an inverter power units 26 are provided which serve to supply the heating units 22 with electrical power. These power units 26 are in FIG. 2 shown.

In FIG. 2 For example, a cooking device circuit 28 of the cooking device 10 is off FIG. 1 shown schematically. As can be seen from the figure, the group of heating units 22 is subdivided into subgroups of a plurality of, in particular, six heating units 22. Each subset of heating units 22 is each assigned a different control unit, which is provided for controlling the subgroup. A subgroup forms a heating module 30 with the respective control unit. In this case, a subgroup is referred to as a heating module group 32, and the control unit that controls the subgroup is referred to as a heating module control unit 34. The cooking device circuit 28 includes a plurality of heating modules 30.1, 30.2 to 30.8. The heating modules 30 each have several, in particular six heating units 22, each comprising a designed as an induction coil radiator 24. In the heating modules 30, a heating unit 24 is assigned in each case a power unit 26 for supplying power to the heating unit 24. The heating modules 30 further each have a plurality of sensor means 35 for pot detection, by means of which it can be detected whether the corresponding radiator 24 is covered by one of the preparation harnesses 18, 20 at least partially.

The heating module control units 34 are designed as microcontrollers and have a microprocessor, not shown. For example, the heating module control units 34 may be designed as DSP (Digital Signal Processor or Digital Signal Processing). The power units 26 of a heating module 30 and the associated heating module control unit 34 are each mounted on a common printed circuit board 36. The printed circuit boards 36.1 to 36.8, which are each assigned to a different heating module 30.1 or 30.8, are formed separately from each other. The cooking device 10 thus has a number of different printed circuit boards 36, which corresponds to the number of heating modules 30. For the sake of clarity, only two heating modules 30.1, 30.2 with the corresponding circuit boards 36.1 and 36.2 have been illustrated in the figure. On the arrangement of further heating modules 30.3 to 30.8 or printed circuit boards 36.3 to 36.8 have dashed lines shown power lines. The cooking device circuit 28 is further provided with a timing unit 38, the operation of which will be described in more detail below. The clocking unit 38 has a clocking means 39 different from the heating module control units 34. It is with a mains power supply 40 on the one hand and connected to each of the heating modules 30 on the other. Furthermore, the clocking unit 38 has a clocking line 42, on which the clocking means 39 provides a clocking signal S and is branched off from the supply lines 44 to a respective one of the heating module control units 34. The timing unit 38 having the timing means 39 and the timing line 42 is formed differently from the heater modules 30, and the timing signal S is distributed in parallel to the heater modules 30 by the timing unit 38.

The power units 26 are each designed as inverters. A power unit 26 preferably comprises at least one pair of switching means 48, which are formed as semiconductor components. Regardless of the topology of the power unit 26, the switching means 48 of the power units 26 are indicated schematically by means of a transistor symbol. In this example, the switching means 48 are formed as an IGBT (Insulated Gate Bipolar Transistor or Insulated Gate Bipolar Transistor). An alternative embodiment of the switching means 48, such as Mosfet (Metal Oxide Semiconductor Field Effect Transistor or metal-oxide-semiconductor field effect transistor), or other, the expert appear useful sense switching means are conceivable. For generating an alternating current, by means of which the heating elements 24 generate the alternating magnetic field formed heating signal H (see Figures 5 and 6 ), the power units 26 are supplied with an electrical signal 50 having a DC voltage V. The power units 26 generate the alternating current from this electrical signal 50 by means of switching operations of the switching means 48, which are controlled by the heating module control unit 34 of the corresponding heating module 30. This principle is known and will not be explained in detail in the context of this description. The electrical signal 50 is generated by means of rectifying a mains power signal 52. For this purpose, the cooking device circuit 28 is provided with a rectifier 54, which is shown schematically by means of a diode symbol. The rectifier 54 is connected to the circuit boards 36 via a DC bus 56. Supply lines 58 for supplying the electrical signal 50 to one of the printed circuit boards 36 or to the power units 26 arranged on this printed circuit board 36 are branched off from this DC bus 56. The heating module control units 34 are interconnected by means of a line 60, via which a data traffic between the heating module control units 34 can be made.

The cooking apparatus 10 is provided for heating the cooking utensils 18, 20 by means of a group operation of the heating units 22. This is based on FIG. 3 explained in more detail. In the figure, the arrangement of the heating units 22 is shown, wherein the distribution of the heating units 22 in the different Heizmodulgruppen 32.1 to 32.8 is shown schematically by solid lines. Furthermore, the heating module control units 34.1 to 34.8 can be seen, which are each provided for controlling one of the heating module groups 32.1 to 32.8 and are connected to one another for data exchange by means of the line 60. In a grouping process, first by means of the sensor means 35 (see FIG. 2 ) examines whether the radiator 24 corresponding to the respective sensor means 35 is at least partially covered by one of the preparation harnesses 18, 20. Here, the radiator 24 are fed in a known manner with a test current, which is evaluated by the sensor means 35. After detecting the respective coverage state of the radiator 24 by means of a heating group formation unit 62 (see FIG. 2 ) Heating groups 64, 66 formed, which are adapted to the dial positions of the preparation utensils 18, 20 shown by means of dash-dotted circular lines. When an operator starts a cooking operation of the cooking apparatus 10 by means of the user interface 16, this cooking operation is performed by means of the heating units 22 of both heating groups 64, 66, while the further heating units 22 belonging to none of the heating groups 64, 66 formed remain idle. If the operator adjusts one of the preparation utensils 18, 20 on the cooking plate 14 or sets up another preparation utensil on the cooking plate 14, corresponding heating groups of heating units 22 are adapted or newly formed on the basis of the new arrangement of cooking utensils to be heated relative to the radiators 24. Within a heating group 64 or 66, the heating units 64 and 66 forming this heating group 22 are preferably operated at the same heating frequency f _H. The heating frequency f _{H of} the heating group 64 may be different from the heating frequency f _{H of} the heating group 66.

The heating units 22, which form a heating group 64 or 66, typically belong to different heating modules 30. It is therefore advantageous for a heating group 64 and / or 66 if a heating group line unit serving for the central control of the heating groups 64 and 66 is provided. In the considered embodiment, one of the Heizmodulsteuereinheiten 34 assumes the role of such a central control unit for the heating group 64 and 66. For this purpose, the cooking device circuit 28 with a in FIG. 2 shown unit 68, which is provided to select a Heizgruppenleitseinheit among the heating module control units 34, which is used to control the heating group 64 or 66 is used. For example, among the heating module control units 34 belonging to heating modules 30, which have heating units 22 of a heating group 64 or 66, a heating module control unit 34 associated with a minimum number of covered heating units 22 can be selected. For example, in the considered case the FIG. 3 the heating module control unit 34.6 of the heating module 30.6 can be selected as a heating group line unit for controlling the heating group 64. For controlling the heating group 64, control connections are made between the heating group line unit and the heating units 22 forming the heating group 64. In particular, the heating group line unit is indirectly connected via the line 60 and one or more other heating module control units 34, which are assigned to the heating group 64, with radiators 24 different heating modules 30. These heating module control units 34 are subordinated to the heating group line unit. The heating group line unit makes a decision about the operating strategy for controlling the heating group 64.

In a heating operation by means of the heating group 64 and / or 66 generate, as described above, the heating element 64 and 66 forming radiator 24 designed as a magnetic alternating field heating signal H, which oscillates with the heating frequency f _H. For this purpose, in the heating modules 30, the heating units 22 are supplied with an alternating current by means of switching operations of the power units 26. For a synchronous control of these switching operations of different power units 26, the heating modules are each provided with a Heizmodultaktgebungseinheit 70.1, 70.2, etc. (see FIG. 2 ). In the considered embodiment, the Heizmodultaktgebungseinheiten 70 each correspond to an internal clock of a Heizmodulesteuereinheit 34. By Heizmodultaktgebungseinheit 70 of a heating module 30 heating units 22 of this heating module 30 by means of the respective heating module internal Heizmodultaktungsungsignals are synchronized with each other, so that by the radiator 24 of the corresponding Heizmodulgruppe 32 generated heating signals H are synchronized in their phase position.

As described above, heating units 22 of different heating modules 30 are typically involved in the formation of a heating group, such as heating groups 64, 66. It is therefore advantageous if heating units 22, which belong to different heating modules 30 or are assigned to different heating module clocking units 70, are synchronized with one another. For this purpose, the cooking device circuit 28, the clocking unit 38. This is formed separately from the heating module control units 34, in particular from the heating module clocking units 70, and is intended to to provide the timing signal S for the heating modules 30. In the considered embodiment, the timing unit 38 is in operative connection with each of the heater module timing units 70 and is provided to synchronize the heater module timing units 70 with each other by means of the timing signal S. The clocking unit 38 with the clocking means 39 and the heating module control units 34, in particular the heating module clocking units 70, thus form in cooperation a synchronization unit 72 which serves to synchronize heating units 22 of different heating modules 30 with one another by means of the clocking signal S provided by the clocking unit 38. In particular, it can be achieved by the synchronization unit 72 that the heating units 22, which form the heating group 64 or 66, are synchronized with one another during operation of the heating group 64 or 66. A synchronization process of the heating units 64 and 66 forming heating units 22 by means of the synchronization unit 72 is based on the FIGS. 4 to 6 described in more detail.

In FIG. 4 the generation of the timing signal S is shown in response to a mains power signal. In the upper part of the in FIG. 4 the course of a designed as a mains power supply voltage supply characteristic value V _{N of} the mains power supply 40 is shown as a function of time t. In the lower part of the course of the timing signal S, which is formed in particular under the form of an electrical voltage, shown as a function of time t. As can be seen from a synopsis of the two partial diagrams, the clocking unit 38 generates a pulse 74 at a zero point of the mains supply parameter V _N. Hereby, the timing signal S corresponds to a train of pulses 74. These pulses 74 are generated at a timing frequency f _T , which in this example corresponds to twice the frequency of the mains power supply 40, in particular 110 Hz.

FIG. 5 shows a synchronization process of heating units 22 belonging to different heating modules 30 which are involved in the formation of the heating group 64. Again FIG. 3 can be seen, the heating modules 30.1, 30.2, 30.5 and 30.6 involved in the formation of the heating group 64. The uppermost parts of the FIG. 5 Curve diagrams shown represent the course of the alternating current, which is fed in each case in a radiator 24 of a different heating module 30, as a function of time t. For example, the alternating current in a radiator 24 of the heating module 30.1, the heating module 30.2 and the heating module 30.5 shown. These alternating currents are respectively generated by means of a power unit 26 of the different heating modules 30.1, 30.2, 30.5, and the switching operations of a power unit 26 are controlled with the corresponding heating module control unit 34.1, 34.2 and 34.5. These switching operations generate a heating frequency f _H , which is identical for the heating modules 30.1, 30.2, 30.5 and 30.6 involved in the heating group 64 and, for example, is 25 kHz. The heating group 66, in which the synchronization of the heating units takes place analogously to the heating group 64, can be operated with this value of the heating frequency f _H or with another value of the heating frequency f _H. Advantageously, the period of the timing signal S corresponds to at least a multiple, such as at least a tenfold, in particular at least a hundred times the period of the heating signal H.

The lowest part of the diagram in FIG. 5 shows the course of the timing signal S as a function of time t. At a point in time t _S, a pulse 74 is generated by the timing unit 38. As can be seen from a synopsis of the uppermost diagram parts, the alternating currents in different heating modules 30 have slight phase shifts Δφ relative to one another. At time t _S , the different Heizmodultaktgebungseinheiten 70.1, 70.2, 70.5 and 70.6 are synchronized with each other. This synchronization of the various Heizmodultaktgebungseinheiten 70 causes new cycles of switching operations of power units 26 are initialized simultaneously in the heating modules 30.1, 30.2, 30.5 and 30.6 at the time of the pulse 74. This, in turn, causes the alternating currents and therefore the heating signals H generated by the various heating modules 30.1, 30.2, 30.5 and 30.6 to be synchronized with one another. Here, the relative phase angles between the three alternating currents are set to zero. By means of the timing signal S, the alternating currents and therefore the heating signals H of different heating modules 30 have the same phase position.

In FIG. 6 an alternative embodiment of a synchronization process of three heating units 22 of three different heating modules 30.1, 30.2 and 30.5 is shown. In this alternative synchronizing mode, which can be carried out by means of the synchronization unit 72, the heating units 22 are synchronized with each other during a synchronization period Δt. Here, the timing unit 38 generates a timing signal S 'at which an electric voltage at zero of the utility power V _{N transits} from zero to a value maintained during a period corresponding to the synchronization time Δt. While of the synchronization period .DELTA.t are changed by means of the synchronization unit 72, the respective heating frequencies f _H of the heating signals H generated by the various heating units 22 such that at the end of the synchronization period .DELTA.t the heating signals H are in phase with each other. This change in the heating frequency f _H in a heating unit takes place by means of a corresponding control of the switching operations of the power units 26 through the respective heating module control units 34.1, 34.2, 34.5. reference numeral 10 cooking apparatus 60 management 12 mounting frame 62 Heizgruppenbildungseinheit 14 hotplate 64 heating group 16 Operator Interface 66 heating group 18 preparation utensils 68 unit 20 preparation utensils 70 Heizmodultaktgebungseinheit 22 heating unit 72 synchronization unit 24 radiator 74 pulse 26 power unit H heating signal 28 A cooking appliance circuit f _H heating frequency 30 heating module S, S ' clocking signal 32 Heizmodulgruppe V DC 34 Heizmodulsteuereinheit V _N AC power parameter 35 sensor means 36 circuit board t Time 38 Taktgebungseinheit t _s time 39 clocking means .delta.t Synchronization period 40 AC power supply Δφ phase shift 42 Taktgebungsleitung 44 supply line 48 switching means 50 signal 52 AC power signal 54 rectifier 56 DC rail 58 supply line

Claims (12)

1. Cooking device circuit with a plurality of heating units (22) and a heating group formation unit (62) which is provided to form a heating group (64, 66) of heating units (22) adjusted to a chosen position of an item of cookware (18, 20), and a synchronisation unit (72) which is provided to synchronise at least two heating units (22) with one another, characterised in that the synchronisation unit (72) has a clock unit (38) which is provided to generate a clock signal (S) as a function of a mains power supply variable (VN) by means of a zero position of the mains power supply variable (VN).
2. Cooking device circuit according to claim 1, characterised in that the synchronisation unit (72) is provided to synchronise heating units (22) of a formed heating group (64, 66) with one another.
3. Cooking device circuit according to claim 1 or 2, characterised by a plurality of heating modules (30.1 - 30.8), which each have at least one heating unit (22) and a different heating module control unit (34.1 - 34.8) in each case for controlling the heating unit (22).
4. Cooking device circuit according to claim 3, characterised in that the heating modules (30.1 - 30.8) each have one heating module group (32.1 - 32.8) of heating units (22) and at least one different heating module control unit (34.1 - 34.8) in each case for controlling the heating module group (32.1 - 32.8).
5. Cooking device circuit according to claim 3 or 4, characterised in that the synchronisation unit (72) has a clock unit (38) which is embodied as different from the heating modules (30).
6. Cooking device circuit according to one of claims 3 to 5, characterised in that the synchronisation unit (72) has a clock unit (38) which is provided to supply the heating modules (30) with a clock signal (S) in parallel.
7. Cooking device circuit according to one of claims 3 to 6, characterised in that the heating modules (30.1 - 30.8) each have a heating module clock unit (70.1 - 70.8) for generating a heating module clock signal for a control process of the heating module (30.1-30.8) and the synchronisation unit (72) has a clock unit (38) for generating a clock signal (S) for at least two different heating module clock units (70.1 - 70.8).
8. Cooking device circuit according to claim 7, characterised in that the clock signal (S) is used to synchronise at least two heating module clock units (70.1 - 70.8).
9. Cooking device circuit according to one of claims 3 to 8, characterised in that the synchronisation unit (72) is provided to synchronise at least two heating units (22) of different heating modules (30.1 - 30.8) with one another.
10. Cooking device circuit according to one of the preceding claims, characterised in that the synchronisation unit (72) is provided to synchronise at least two heating units (22) during a synchronisation time interval (Δt).
11. Cooking device circuit according to claim 10, characterised in that in an operating mode a heating unit (22) is used to generate a heating signal (H) with a heating frequency (fH) and the synchronisation unit (72) is used to change the heating frequency (fH) during the synchronisation time interval (Δt).
12. Cooking device with a cooking device circuit according to one of the preceding claims.

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