ES2323837B1 - COOKING DEVICE CIRCUIT AND PROCEDURE FOR THE WARMING OF AN OBJECT. - Google Patents

Abstract

Cooking device circuit and procedure for heating an object.

The invention relates to a circuit of cooking device with a group of heating units (22), a command unit (30), which is intended to form a heating unit of heating units (22) adapted to a position of choice of a preparation battery (18, 20), and a signal processing device (32), which is provided for processing a signal (42.1, 42.2) to an adapted form for power operation of the unit heating.

To optimize a cooking operation of economically, it is proposed that the processing device of signals (32) present a first processing unit of signals (36.1) for the supply of a first subgroup of units heating (22) and at least a second unit of signal processing (36.2) for the supply of one second subgroup of heating units (22).

Description

Cooking device circuit and procedure for heating an object.

The invention relates to a circuit of cooking device according to the general concept of the claim 1, as well as to a method for heating of an object according to the general concept of claim 10.

It is known a cooking device that It has a hob for the placement of a battery preparation and a set of induction coils that forms an area of cooking related cooking plate. The device of cooking is planned to heat the battery in the cooking area  of preparation in a position arbitrarily chosen by a Username. For this, the cooking device has a unit control that forms a cooking zone of the hob adapted to the position of the preparation battery chosen by the user through the formation of a group of coils of induction. In one operation, a power of induction coil heating by connection processes of investors. Investors are given a signal electrical that is obtained from a supply signal of network current and that presents an appropriate form for connection processes As an example, the electrical signal for the inverter supply is a rectified current signal from the mains power supply.

The task of the invention consists especially of make available a circuit, as well as a procedure for a device according to gender with improved features concerning optimized cooking operation so economical

According to the invention, the task is solved at through the features of claims 1 and 10, while from the secondary claims can be extracted advantageous configurations and improvements of the invention.

The invention relates to a circuit of cooking device with a group of heating units, a command unit that is planned to form a group of heating of heating units adapted to a position of choice of a preparation battery, and a device signal processing that is planned for the processing of a signal to a form adapted for power operation of the heating unit.

It is proposed that the processing device of signals present a first signal processing unit for the supply of a first subgroup of units of heating and at least a second processing unit of signals for the supply of a second subgroup of units of heating. Through this, you can get a cooking operation of a cooking device provided with the cooking device circuit according to the invention more efficient, more careful for electronic components of the signal processing device, being distributed a load to be heated between at least two units of signals processing. When this happens, you can optimize especially economical way a cooking operation cash. In this case, the signal processing units they are in operation preferably connected to a common external power supply, for example, a connection to a mains power supply, and advantageously are connected in parallel to each other. In this case, the signal which has to be processed corresponds in particular with a signal obtained from a mains power supply. When this happens, a bypass point is postconnected to a connection point of mains power supply, in which they are derived at least two line units for connection each with a unit of signals processing. Signal processing units they can be partially configured in one piece one with other. However, it is advantageous if the processing units of Signals are configured separately from each other. Preferably, the first and second subgroups form in action joint the total group of heating units.

For a "heating unit" you must understood in this context especially a unit that is intended for the transmission of a heating energy to the preparation battery The heating unit presents the minus a heating medium that is configured for example as a means of inductive heating or as a radiation body. The heating unit can present a single means of heating or may comprise a plurality of means of heating.

For a "unit power operation of heating "must be understood in particular an operation of a heating unit, in which a power of heating is transmitted by the heating unit to the preparation battery In the power operation of the heating unit, advantageously to the unit heating is supplied electric power by a unit of power.

If the heating unit comprises at least an inductive heating medium, the power unit presents preferably an inverter with connection means, for example transistors, which makes available through connection of the connection means in a known manner a power of heating for the heating medium. For the performance of the power operation of the unit heating must be generated from a signal obtained from a mains power supply a signal for the supply to the power unit, presenting a form adapted to the performance of the power operation of the unit heating. This signal generated by a processing unit of signals serves in this case advantageously as a signal of input for a power unit. By doing this, the unity of signal processing is advantageously connected between a connection point for connection with a supply of mains current and a power unit. If the unit of heating has an inductive heating medium, a signal adapted to a power operation of the unit heating corresponds to a rectified and / or filtered signal that is available for obtaining through a unit of power. Preferably, the signal processing units each have at least one rectifier and / or a filter unit  which is planned for rectification and filtering respectively of a signal obtained from the power supply Network

For a "position of choice" must especially understand a preparation battery position that can be chosen arbitrarily by a user within a related cooking area for heating a battery of preparation. This cooking area is advantageously set.  through the group of heating units. For an "area of cooking for heating a preparation battery "has to understand in this context especially an area of a cooking device that is suitable for operating cooking battery preparation. The cooking area is preferably corresponds to a partial area of a plate of cooking of the cooking device that covers the group upwards of heating units in vertical direction. Unlike that a cooking device with separate cooking zones that are each assigned to a heating body, thereby an intermediate space between the cooking zones for a cooking operation is inappropriate, the cooking area it represents in an related way an essential part, especially more than 50%, advantageously more than 75%, and preferably more 90% of the total surface of the hob, which is appropriate for a cooking operation, through which it you can achieve especially high flexibility in the choice of a cooking position of the preparation battery. For this, the group of heating units presents for achieve a large cooking area preferably at least 10, of advantageously at least 20 heating units. Unit command is specially planned to form with a position of choice of the preparation battery in the cooking area the heating unit heating units for the Preparation battery heating. For a position of the preparation battery "in the cooking area" must especially understand a preparation battery position with respect to the cooking area, in which the battery base of Preparation is completely arranged in the cooking area.

Especially advantageously, the group of heating units is configured in an arrangement of matrix. By a "matrix arrangement" it should be understood in special an arrangement in which the heating units are configured in a plurality of rows aligned so parallel to each other, and especially where the distance between two heating units directly adjacent in a row be constant across the row.

For a "row" of heating units a provision of at least three must be understood in particular heating units that are arranged along a straight line. In a matrix arrangement of the units of heating can be understood by a "row" especially a matrix row or a matrix column. The dimension of the heating units are advantageously chosen in such a way so that a standard battery, such as a battery of preparation with a diameter of at least 8 cm., cover units of heating of at least two parallel rows.

In a preferred embodiment of the invention it is proposed that the first processing unit of signals serve to process a signal with a first current phase and the second signal processing unit serve for the processing of a signal with a second phase of current, different from the first phase of current, through what which power supply can be achieved especially cash. If in a position of choice of the battery of preparation the corresponding heating group is consisting of heating units of the first and second subgroup, power values can be achieved especially high.

The first subgroup and the second subgroup, which are assigned to the first and second signal processing units respectively, can overlap. In this case, heating units can be fed by the first and / or the second signal processing unit. Subgroups can be specially set identically. However, it is advantageous if the first subgroup and the second subgroup are configured differently from each other at least to a large extent, especially completely, through which a simple construction realization can be achieved with an expense in poor wiring The first subgroup and the second subgroup are different from each other "at least to a large extent" if in particular the percentage of the heating units that are assigned to both subgroups represents less than 50%, advantageously less than 25% and
preferably less than 10% of the total number of heating units of the cooking device circuit.

In an advantageous improvement of the invention it is proposed that the first subgroup and the second subgroup form an interlaced arrangement of heating units. By an "interlaced provision" it is to be understood in this context especially an arrangement of heating units that is configured so that in any position of choice of the preparation battery the base of the preparation battery cover heating units of the first and second subgroups. In this case, it is formed by the command unit in each position of choice a heating group that is composed of heating units of the first and second subgroups. TO through this, a distribution can be achieved especially advantageous of a power supply between the units of signal processing for each position of arbitrary choice of the preparation battery. If the group of units of heating is configured in an array arrangement, then this array arrangement corresponds to a interlaced arrangement if in at least one row of the layout of matrix, that is, in a matrix row or a matrix column, especially at most five, advantageously at most three heating units of the same subgroup are arranged a behind another.

It is also proposed that the group of units of heating present at least one row in which it is arranged at least one heating unit of the first subgroup between heating units of the second subgroup. In this case, the heating unit of the first subgroup is arranged between a heating unit of the second subgroup that is arranged before it in a row direction, and a heating unit of the second subgroup that is arranged after it in row address, whereby the heating units of the second subgroup may be different from a direct neighbor of the heating unit of the first subgroup.

It is also proposed that the group of units of heating present at least one row in which the units of heating are alternately assigned to the first and the second subgroup, through which you can get a especially advantageous distribution of a load to be provided between subgroups. The heating units of the row are assigned "alternately" to the first and the second subgroup if in the row for a predominant number of pairs of directly adjacent heating units, especially for all pairs of heating units directly adjoining, the pairs are composed each time of units of heating of different subgroups. By "so alternating "can be understood especially" so successive ". For a" predominant number "of pairs must especially understood at least half, preferably at least three quarters of the total number of formable pairs.

In a preferred embodiment of the invention, proposes that the group of heating units be configured in a matrix arrangement that has at least one area in the that a heating unit of the first subgroup be directly adjacent in the row and column direction of heating units of the second subgroup, through which a uniform distribution can be achieved to the greatest extent possible of a load between the groups.

This can be achieved especially simple if in the array arrangement the units of heating are assigned in the row and column direction of alternating way to the first and second subgroups. Yes the units Signal processing serve for signal processing of different phases of current, with such an arrangement it can achieve an especially high heating power of a heating group formed. As an example, consumption of current in the power supply of a group of heating can be doubled compared to a system single-phase, and in fact advantageously with non-demanding requirements modified on a processing electronics for the processing of a network current signal. As an example, a current consumption in the power supply of a group of heating can be increased from 16 A to 32 A. This is especially advantageous especially in an amplification mode of power (or Boost or lift mode) in an operation of cooking.

The invention further relates to a procedure for heating a preparation battery arranged in a position of choice on a hob by a set of heating units, in which a heating group of heating units is formed of way adapted to the position of choice and a warming of the Preparation battery is powered by the group of heating.

It is proposed that in the heating group a part of heating units get a power of heating of a first phase of current and at least one second part of heating units obtain a power of heating of a second phase of current. In this way, it can distribute an advantageous distribution of a power that has if delivered between two signal processing units and high power values can be achieved.

Other advantages are taken from the following Description of the drawings. In the drawings they are represented Examples of embodiment of the invention. The drawings, the description and claims contain features numerous in combination. The expert will consider the features advantageously also individually and you will gather them in other reasonable combinations.

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They show:

Fig. 1 an induction cooking field with a hob and a group of heating units as well as two cooking batteries arranged on the cooking plate,

Fig. 2 a circuit of the cooking field by induction of figure 1 with two rectifiers, each of the which is assigned to a subgroup of units of heating,

Fig. 3 an array arrangement of the units heating with two blocks, each of which is assigned to a subgroup,

Fig. 4 an interlaced array arrangement of the heating units, in which matrix columns are alternately assigned to the first and second subgroups,

Fig. 5 an interlaced array arrangement of the heating units, in which matrix rows are alternately assigned to the first and second subgroups Y

Fig. 6 an interlaced array arrangement of the heating units, in which in the rows of matrix and the matrix columns the heating units are alternately assigned to the first and second subgroups.

Figure 1 shows a cooking device 10 set as induction cooking field. The device of cooking 10 shows a fixing frame 12 for fixing to a work plate, a cooking plate 14 for the placement of cooking batteries and a control panel 16 to start, stop and set a heating operation. On the plate cooking 14 two preparation batteries 18, 20 are arranged configured as a pot, each of which a base of Preparation battery is schematically represented by A continuous circular line. For the realization of a cooking operation of the cooking device 10, this is provided with a group of heating units 22, each of which comprises a heating body 24 configured as induction coil. The arrangement of the heating bodies 24, which in the figure are schematically represented by a dashed line rectangle is set as array layout In this case, heating bodies 24 of different columns and different rows are covered by the preparation battery 18. In the embodiment shown, an example is a group of 48 units of heating 22 with each a heating body 24. Other embodiments of the cooking device 10 are possible with others heating unit numbers 22.

In an operation of a unit of heating 22, a heating signal H configured as Alternate magnetic field is generated by the heating body 24 corresponding (see figure 2), which presents a heating frequency that amounts to 25 kHz, for example. The heating signal H induces electrical currents in the base metallic batteries preparation 18, 20. These currents electric heat a plate that is heated by ohmic losses find in preparation batteries 18, 20. A body of heating 24 in the operation of the heating unit 22 corresponding is fed to the signal generation of heating H with an alternating electric current, which oscillates with the heating frequency. For the generation of this alternating current power units are planned 26 configured as inverters, which are planned for supply to the heating units 22 of electric power. These power units 26 are represented in the figure 2.

The cooking device 10 is intended for heating the preparation batteries 18, 20 by means of a operation in groups of heating units 22. To the heating units 22 are each provided with a sensor means not shown in more detail, by means of the which can be recognized if the heating body 24 corresponding is at least partially covered by one of the preparation batteries 18, 20. With the help of a process grouping not described in more detail, groups of heating of heating units 22, each of the which is assigned to one of the preparation batteries 18, 20. If a user starts a cooking operation of the device cooking 10 via the control panel 16, this operation of cooking is done by heating units 22 of both heating groups, while the other units of heating 22 that are not part of any of the groups of heating formed remain inactive. If the user change one of the preparation batteries 18, 20 on the cooking plate 14 or place another cooking battery on the plate of cooking 14, new groups of corresponding heating of heating units 22 by means of the new arrangement of preparation batteries that have to be heated with respect to the heating bodies 24.

Figure 2 shows a device circuit of cooking 28 of the cooking device 10. The group is recognized of heating units 22. Heating units 22 each has a heating body 24 configured as induction coil. For clarity, in the figure they were represented only eight heating units 22. The lines of current represented in dashed line indicate the arrangement of other heating units 22, that is, power units 26.

In the embodiment shown, to a unit of heating 22 is assigned each time a power unit 26 different. Power unit 26 is configured as an inverter and presents connection means not shown in more detail which are intended for the generation of an alternating current with The heating frequency. A power unit 26 comprises preferably at least one pair of connection means that are configured as semiconductor components. To the means of connection of power units 26 referenced schematically with the help of a transistor symbol so independent of the topology of power unit 26. In this example; the connection media are configured as IGBT (Insulated Gate Bipolar Transistor or bipolar transistor with insulated door electrode). An alternative embodiment of connection means, such as Mosfet (Metal Oxid Semiconductor Field Effect Transistor or effect transistor metal oxide semiconductor field), or others that result Reasonable means of connection to the expert are thinkable. The inverters can be configured with different topologies, such as with a pair of connection media in a topology semipuente or with two pairs of connection means, which are arranged in a complete bridge topology. That's it thinkable that the power units 26 are configured at less partially in one piece with each other. It is also thinkable that a power unit 26 is intended for the power supply of two or more heating units 22

For operation control in groups described above of the heating units 22, the circuit of cooking device 28 is further provided with a unit of control 30. Control unit 30 may have a microprocessor or it can be configured as a microprocessor. This one is connected to the different power units 26. The control unit 30 is  specially configured for, depending on the choice positions shown in figure 1 of the batteries of Preparation 18, 20 on the cooking plate 14, form the groups of heating and directing a heating process with the heating groups

For the generation of an alternating current, by means of which the heating bodies 24 generate the heating signal H configured as an alternating magnetic field, the power units 26 are each supplied with an electrical signal that has a continuous voltage V. The units of power 26 generate the alternating current by means of this electrical signal by means of connection processes of the connection means. This principle is known and is not explained in more detail within the framework of this description. The cooking device circuit 28 has a signal processing device 32 which serves to transform a signal obtained from a supply of mains current 34 into a signal adapted for operation of the power units 26. For the generation of a signal with the continuous voltage V, the signal processing device 32 is configured to rectify a signal
Signal obtained from mains power supply. In this, the continuous voltage V amounts to, for example, 220 V or 230 V.

According to the invention, the device of Signal processing 32 features two processing units of signals 36.1, 36.2, each presenting a rectifier. In addition, the group of heating units 22 is divided into two subgroups, whereby a first subgroup is assigned to the signal processing unit 36.1 and a second subgroup is assigned to the signal processing unit 36.2. In this case, the heating units 22 of the first subgroup are electrically connected to the first processing unit of signals 36.1, while heating units 22 of the second subgroups are electrically connected to the second unit of signal processing 36.2.

The first signal processing unit 36.1 generates a first signal 38.1, which presents a voltage rectified V and is made available in a first lane of 40.1 direct current for obtaining through units of power 26. This signal 38.1 can be obtained by units of power 26 that serve for the power supply of units of  heating 22 of the first subgroup. In the operation of a heating unit 22 of the first subgroup, signal 38.1 of the voltage V is supplied to power unit 26 corresponding through lines derived from the current lane continued 40.1. The second signal processing unit 36.2 generates a second signal 38.2, which also has a rectified voltage V and is made available in a second 40.2 DC rail for obtaining through power units 26. This signal 38.2 can be obtained by power units 26 that serve for power supply of heating units 22 of the second subgroup. At operation of a heating unit 22 of the second subgroup, signal 38.2 of voltage V is supplied to the unit of corresponding power 26 through lines derived from DC lane 40.2.

In the embodiment shown, the device signal processing 32 is connected to the supply of mains current 34, which is used to supply a current swivel In this case, in the connected state of the circuit cooking device 28 to the mains power supply 34, the signal processing units 36.1, 36.2 are connected to different phase lines of the mains power supply 34. In In this case, the first signal processing unit 36.1 is electrically connected to a first line L2 and a conductor neutral N of the mains power supply 34, through which a first signal 42.1, which has a first phase, is obtained by the signal processing unit 36.1. The second unit signal processing 36.2 is electrically connected to the second line L1 and the neutral conductor N, through which a second signal 42.2, which presents a second phase, different from the first phase, is obtained by the signal processing unit 36.2. The signals 42.1, 42.2 are transformed by the unit signal processing 36.1 and 36.2 respectively in the signal 38.1 and 38.2 respectively of the continuous voltage V. In summary, signal processing units 36.1, 36.2 are provided for the provision of subgroups each with a phase of different current.

The signal processing units 36 are connected in parallel to each other with respect to the mains power supply 34. Power units 26 they are connected in a row each with one of the units signal processing 36 and parallel to each other. From alternative or additional way to rectifiers, the units of  signal processing 36.1, 36.2 may be provided each of another means of signal processing, such as a filter unit In another variant embodiment, the circuit of cooking device 28 may be attached to a supply of network power that is configured as a supply of alternating current of a phase. In this case, signals 42.1, 42.2 they have an identical current phase.

Different distributions are described space of the heating units 22 of the first and the second subgroup by means of figures 3 to 6. Each of them shows the arrangement of heating units 22 as well as the outline of the preparation battery bases (see also the Figure 1). The heating units 22 of the first subgroup, is that is, the heating units 22 assigned to the first Signal processing unit 36.1 are represented by a continuous line while the units of heating 22 of the second subgroup, that is, the units of heating 22 assigned to the second processing unit of signals 36.2, are indicated by a dashed line.

The arrangement of the heating units 22 corresponds to a matrix arrangement. This arrangement it presents four rows of matrix that are indicated as rows 44a at 44d. These are aligned in a direction of row 45 that in the configuration shown corresponds to the horizontal direction. In a row 44, the heating units 22 are on consequently arranged along a straight, horizontal and two heating units 22 directly adjacent distanced from each other with a section S that is constant across of row 44. In addition, the provision has twelve columns of matrix that are indicated as rows 46a to 46l. These are oriented in a column address 47 than in the configuration shown is vertically to the first row address 45, and in fact corresponds to the vertical direction. In a row 46, the heating units 22 are therefore arranged along a straight, vertical line and two units of heating 22 directly adjacent are spaced one of another with a section T that is constant through row 46. They are thinkable alternative matrix provisions, in which the row address 45 and column address 47 are not arranged vertically to each other, such as in a honeycomb layout

In the following embodiments, the group of heating units 22 is distributed in two subgroups that are not overlapping. In this case, all units heating 22 of the first subgroup are assigned exclusively to the first signal processing unit 36.1,  while all heating units 22 of the second subgroups are assigned exclusively to the second unit of signal processing 36.2. In a variant embodiment, it is thinkable that a fraction of the heating units 22 or all heating units 22 are assigned to both signal processing units 36.1, 36.2. Then it is thinkable, for example, that signal processing units 36.1, 36.2 selectively supply units of heating 22 of the first subgroup and / or the second subgroup.

Figure 3 shows a first variant of distribution in which a left half of the provision of matrix is composed of heating units 22 of the first subgroup while a right half of the provision of matrix is composed of heating units 22 of the second subgroup. In the description of figures 3 to 6, the terms "up", "down", "horizontal", "vertical", "on the left" and "on the right" refer to the view of an end user of the cooking device 10 observing the cooktop 14 under usual driving conditions. In this case, the "bottom" edge of the cooking plate 14, that is, the bottom row 44d, is directed towards the user. In the configuration of figure 3, the array arrangement is divided in a first block of heating units 22 of the first subgroup and in a second block of heating units 22 of the Second subgroup In this case, a block extends throughout the entire provision in a first matrix address, and indeed in special in the direction of column 47, and the blocks are arranged in the second matrix address, and indeed in Special address of row 45, next to each other.

Figures 4, 5 and 6 each show a example of an interlaced arrangement. With this provision, in an arbitrary choice position of a preparation battery on the cooking plate 14 are covered by the base of preparation battery heating units 22 of the first and the  Second subgroup Consequently, it is achieved that in a cooking operation of the cooking device 10 and in any position of choice of a preparation battery over the cooking plate 14 the preparation battery cover units of heating 22 that obtain a heating power of a first phase of current, and heating units 22 that obtain a heating power of a second phase of stream. The different configurations of rows 44, 46 are indicated in figures 4 to 6 by reference symbols in dashed line.

Figures 4 and 5 each represent a provision that corresponds to a cross provision of heating units 22.

In Figure 4, rows 46'a to 46'l are alternately assigned to the first subgroup and the second subgroup. In this case, each pair of rows 46 'directly adjoining consists of a row 46 'assigned to the first subgroup and of a row 46 'assigned to the second subgroup. In this configuration, heating units 22 are assigned in each row 44 'alternately to the first and second subgroup.

Figure 5 shows another example of a cross layout, in which rows 44''a to 44''d are alternately assigned to the first subgroup and the second subgroup. In this case, each pair of horizontal rows 44 '' directly adjacent consists of a 44 '' row assigned to the first subgroup and a 44 '' row assigned to the second subgroup. In this configuration, the heating units 22 are assigned in each row 46 alternately to the first and the Second subgroup

Another example of an interlaced arrangement is represented in figure 6. In this configuration, in each row 44 '' 'and 46' '' heating units 22 are assigned from alternating way to the first and second subgroups. In this case, each heating unit 22 of a subgroup in a row direction 45 and in the direction of column 47 is directly adjacent to a heating unit 22 of the other subgroup. Also, in this configuration are assigned matrix diagonal of it alternating orientation to the first and second subgroups. In this configuration it can be advantageously achieved that in any position of choice of a preparation battery over the cooking plate 14 a corresponding heating group is distributed evenly to the greatest extent possible between the first and second subgroup.

Another embodiment of an interlaced arrangement it may consist of the array arrangement being composed of sub-matrices or blocks that in the direction of row 45 and in the direction of column 47 are alternately assigned to the first and the Second subgroup

Reference symbols

10

Cooking device

12

Framework

14

Cooking plate

16

Control panel

18

Prep battery

twenty

Prep battery

22

Heating unit

24

Heating body

26

Power unit

28

Cooking device circuit

30

Control unit

32

Signal processing device

3. 4

Mains power supply

36

Signal Processing Unit

38

Signal

40

DC rail

42

Signal

44

Row

Four. Five

Row address

46

Row

47

Column address

Claims (10)

1. Cooking device circuit with a group of heating units (22), a control unit (30), which is intended to form a heating group of heating units (22) adapted to a position of choice of a preparation battery (18, 20), and a signal processing device (32) that is intended for the processing of a signal (42.1, 42.2) to a form adapted for a heating unit power operation, characterized in that the signal processing device (32) has a first signal processing unit (36.1) for the supply of a first subgroup of heating units (22) and at least a second signal processing unit (36.2) for the supply of a second subgroup of heating units (22). 2. A cooking device circuit according to claim 1, characterized in that the first signal processing unit (36.1) is used for processing a signal (42.1) with a first current phase and the second signal processing unit (36.2 ) is used for processing a signal (42.2) with a second current phase, different from the first current phase. 3. Cooking device circuit according to claim 1 or 2, characterized in that the first subgroup and the second subgroup are configured at least to a large extent differently from each other. 4. Cooking device circuit according to one of the preceding claims, characterized in that the first subgroup and the second subgroup form an interlaced arrangement of heating units (22). 5. Circuit cooking device according to one of the claims listed above, characterized in that the group of heating units (22) has at least one row (44 ';46'';44''', 46 '''), in which at least one heating unit (22) of the first subgroup between heating units (22) of the second subgroup is arranged. A cooking device circuit according to claim 5, characterized in that the group of heating units (22) has at least one row (44 ';46'';44''', 46 '''), in which The heating units (22) are alternately assigned to the first and second subgroups. 7. Cooking device circuit according to claim 5 or 6, characterized in that the group of heating units (22) is configured in a matrix arrangement having at least one area in which a heating unit (22) of the first subgroup is directly adjacent in row direction (45) and column direction (47) of heating units (22) of the second subgroup. 8. Cooking device circuit according to claim 7, characterized in that in the array arrangement the heating units (22) are assigned in the row direction (45) and column direction (47) alternately to the first and second subgroup. 9. Cooking device, especially induction cooking device with a device circuit of cooking according to one of the stated claims previously. 10. Procedure for heating a preparation battery (18, 20) arranged in a position of choice on a cooking plate (14) by means of a set of heating units (22), in which a group of heating units heating (22) is formed in a manner adapted to the position of choice and a heating of the preparation battery (18, 20) is activated by the heating group, characterized in that in the heating group a part of heating units ( 22) obtains a heating power of a first phase of current and at least a second part of heating units (22) obtains a heating power of a second phase of current.