DE102019218792A1 - Cooking device - Google Patents

Abstract

The invention relates to a cooking device (10), in particular a cooktop device, with a control unit (12) which, in a periodic continuous heating operating state (106), for repetitive activation and energy supply of at least one first induction target (14) and at least one second induction target (50 In order to improve properties with regard to actuation, it is proposed that the control unit (12) be provided in an initial heating operating state (104) with an initial operating period (76) at least one operating parameter set for the permanent heating operating state (106 ) to be determined and the induction targets (14, 50) to be converted into the continuous heating operating state (106) when at least one tolerance condition is met and to be operated in the continuous heating operating state (106) taking into account the operating parameter set.

Description

The invention relates to a cooking device according to the preamble of claim 1 and a method for operating a cooking device according to the preamble of claim 15.

Hobs are already known from the prior art, which have inductors which are operated with matched heating frequencies to avoid acoustically perceptible coupling noises, with control schemes for controlling inductors for heating cooking utensils as a result of increased customer requirements for control quality and functionality of a hob in a complex finding and calculation process can be determined, which places high demands on production and on installed components and therefore results in a relatively high cost.

The publication EP 1 951 003 B1 discloses in this context a method for the simultaneous operation of two inductors of an induction hob to avoid the occurrence of coupling noises and a time-uneven current network load, the inductors together with a first heating frequency in a first time interval and with a second in a second time interval in the method , heating frequency different from the first heating frequency.

The publication also discloses US 7,910,865 B2 a method for operating an induction hob, in which the inductors are operated during a section of operation with a common heating frequency and during another section of operation with different heating frequencies, the heating frequencies having a frequency spacing between 15 kHz and 25 kHz.

The object of the invention is, in particular, to provide a generic cooking device with improved properties with regard to control. The object is achieved by the features of claims 1 and 15, while advantageous refinements and developments of the invention can be found in the subclaims.

The invention is based on a cooking device, in particular a cooktop device and preferably an induction cooktop device, with a control unit which, in a periodic continuous heating operating state, for repetitive activation and energy supply of at least one first induction target and at least one second induction target with an operating period which in particular has at least two time intervals , is provided.

It is proposed that the control unit be provided in an initial heating operating state with an initial operating period, in particular with at least two initial time intervals, to determine at least one operating parameter set for the permanent heating operating state and to convert the induction targets into the permanent heating operating state when at least one tolerance condition is met and taking into account the operating parameter set in Operate continuous heating mode.

The inventive design allows a generic cooking appliance device with improved properties with regard to a particularly simplified control and / or in particular with regard to low-noise operation to be provided. A simplified control can in particular significantly reduce the effort required to find realizable control schemes. In this way, in particular inexpensive and / or less powerful components can be used. The effort to control a desired heating output desired by an operator can advantageously be reduced with a number of induction targets. In particular, simple performance control can be made possible. In particular, lengths of time intervals of an operating period and / or of initial time intervals of an initial operating period can in particular be determined analytically, as a result of which physically useful values for the lengths of the time intervals and / or the initial time intervals can advantageously be calculated. In particular, this allows the time intervals to be adjusted in a balanced manner and advantageously the length of the time intervals to be of the same size. In particular, activation of the induction targets can be implemented, in which a number of time intervals is less than a number of induction targets, as a result of which the complexity of the activation can be reduced. In this way, in particular an unfavorable acoustic load on an operator can be avoided, as a result of which in particular a high level of operating comfort and in particular a positive operating impression can be achieved with the operator, in particular with regard to acoustic quality. Flicker can preferably be according to a flicker standard, in particular according to the DIN EN 61000-3-3 standard , can be at least largely avoided by advantageously controlling individual induction targets. In particular, a reliable configuration can preferably be achieved in relation to a target heating output requested by the operator. In particular, several induction targets can advantageously be quiet and with a flicker-controlled Load of a supply network can be operated simultaneously.

In particular, temporal lengths of the initial operating period and the operating period are of the same length in time. In particular, the operating parameter set can have one or more heating frequencies, in particular standard heating frequencies and / or output heating powers and / or lengths for one or more initial time intervals and / or time intervals for one or more induction targets. A number of time intervals is advantageously smaller than a number of induction targets. A number of the initial time intervals is advantageously smaller than a number of the induction targets. The number of initial time intervals is advantageously equal to the number of time intervals. A length of a respective initial time interval is advantageously equal to a length of a respective time interval. In particular, a chronological order of the initial time intervals can be different from a chronological order of the time intervals.

A “cooking appliance device”, advantageously a “hob device” and particularly advantageously an “induction hob device” is to be understood in particular to mean at least a part, in particular a subassembly, of a cooking device, in particular a baking oven, for example an induction baking oven, and advantageously a hob and particularly advantageously an induction hob will. A household appliance having the cooking appliance device is advantageously a cooking appliance. A household appliance designed as a cooking appliance could, for example, be an oven and / or a microwave and / or a grill appliance and / or a steam cooking appliance. A domestic appliance designed as a cooking appliance is advantageously a hob and preferably an induction hob.

A “control unit” is to be understood in particular to mean an electronic unit which is preferably at least partially integrated in a control and / or regulating unit of a cooking device device, in particular a hob device, advantageously an induction hob device, and which is in particular provided for at least one inverter unit of the cooking device device to control and / or regulate with at least one inverter, in particular a resonance inverter and / or a dual half-bridge inverter. In particular, the control unit evaluates a signal provided by a unit, in particular a sensor and / or detection unit, according to which the control unit can initiate a special process and / or operating state, in particular if at least one condition is met. The control unit preferably comprises a computing unit and in particular, in addition to the computing unit, a storage unit with a control and / or regulating program stored therein, which is intended to be executed by the computing unit.

A “continuous heating operating state” is to be understood in particular to mean an operating state in which a unit, in particular at least two induction targets, is controlled and / or the unit, in particular the induction targets, is operated by means of a special method and / or a special algorithm, the control unit in particular operates the induction targets in a coordinated manner. In particular, the continuous heating operating state lasts, in particular uninterrupted in time, at least 1 s, preferably at least 10 s, advantageously at least 60 s and particularly preferably at least 300 s, electrical energy being provided in particular at least one induction target, the induction target converting the electrical energy provided into an output heating output , which is advantageously not equal to 0 and corresponds in particular to a target heating output over a time average. In particular, in the continuous heating operating state there is an increase in the temperature of a cookware of the induction target and / or an increase in temperature and / or an at least partial phase transition of a cooked item in the cookware. In particular, the temperature increase of the cookware and / or the food to be cooked is in particular at least 1 ° C., advantageously at least 10 ° C., preferably at least 50 ° C. and particularly advantageously more than 100 ° C. In particular, a mass fraction of the food which undergoes a phase transition is at least 1%, advantageously at least 5%, preferably at least 10% and particularly advantageously at least 20%.

In the continuous heating operating state, the control unit provides in particular at least one output heating output of at least the first and / or second induction target, advantageously at least a large part of the output heating output of the first and / or second induction target and preferably all output heating outputs of the first and / or second induction target by means of a heating frequency and / or by means of of mutually phase-shifted control signals and / or by means of a duty cycle. An “output heating power” of the first and / or second induction target is to be understood in particular as an electrical power which inductors of the first and / or second induction target provide, in at least one continuous heating operating state, cookware of the first and / or second induction target for heating within a time interval.

An “initial heating operating state” is to be understood in particular to mean an operating state which corresponds in particular to the Continuous heating operating state temporally, advantageously immediately, in advance. In particular, in the initial heating operating state, the control unit determines at least one set of operating parameters and / or a control scheme for controlling induction targets and in particular the length of the initial time intervals. In particular, the temperature increase of the cookware and / or the food to be cooked is in particular less than 10 ° C., advantageously less than 5 ° C., preferably less than 1 ° C. In particular, a mass fraction of the food which undergoes a phase transition is less than 10%, advantageously less than 5%, preferably less than 1% and particularly advantageously less than 0.5%. In particular, the initial heating operating state is different from a frequency sweep operating state in which the control unit determines at least one dependency of an output heating power on a heating frequency, preferably individually, for each induction target. In particular, the initial heating mode follows the frequency sweep mode. The control unit advantageously ends the frequency sweep operating state before the initial heating operating state and initiates the initial heating operating state always after the frequency sweep operating state. In particular, the control unit initiates the frequency sweep operating state together with the initial heating operating state following the frequency sweep operating state after a definition of an induction target by the control unit.

“Repetitive activation” of a unit is to be understood here to mean, in particular, activation of the unit that repeats itself periodically in at least one continuous heating operating state, in particular with an electrical signal. An “average heating power” of an induction target is to be understood to mean, in particular, electrical power supplied to the induction target, averaged over a period of time, in particular over an operating period and / or a time interval. An “overall average heating power” is to be understood in particular as a sum of all average powers of the induction targets in a time period, for example in a time interval, an initial time interval and / or an operating period. The average electrical heating power preferably corresponds to a target heating power set by the operator. An “operating period” is to be understood in particular as a period of time during which the induction target is operated in a continuous heating operating state. In particular, the induction target is activated during the operating period, electrical energy being able to be supplied to the induction target, it being possible for the electrical energy to be negligible. The operating period is preferably divided into at least two time intervals during which, in particular, the induction target is supplied with a respective constant electrical energy. An “initial operating period” is to be understood in particular to mean a period of time during which the induction target is operated in an initial heating operating state. In particular, the induction target is activated during the initial operating period, electrical energy being able to be supplied to the induction target, it being possible for the electrical energy to be negligible. The initial operating period is preferably divided into at least two initial time intervals during which, in particular, the induction target is supplied with a respective constant electrical energy. An “initial time interval” is to be understood in particular as a period of time whose duration is longer than 0 s and shorter than the initial operating period, with a duration of all initial time intervals of the initial operating period corresponding exactly to the duration of the initial operating period. In particular, individual initial time intervals can have a different duration from one another.

A “power surplus” of an induction target is to be understood in particular to mean a power whose average value in relation to a time interval and / or an initial time interval exceeds the average power of the induction target. In particular, the excess power can be achieved by applying an alternating electromagnetic field with a heating frequency that is different from a target frequency, a target heating power required and / or set by the operator being provided when the induction target is operated with the target frequency. In particular, the excess power can be achieved when the cooking appliance device is operated in a ZVS mode with a heating frequency which is lower than the target frequency. In particular, the excess power can be achieved when the cooking appliance device is operated in a ZCS mode with a heating frequency that is higher than the target frequency. A “ZVS mode” is to be understood in particular as a zero-voltage switching mode in which a voltage with a value of approximately zero is present when a switch element is switched. A “ZCS mode” is to be understood in particular as a zero-currentswitching mode in which a current with a value approximately equal to zero is present when a switch element is switched. In particular, the heating frequencies are selected by the control unit in such a way that the heating frequencies do not generate intermodulation interference signals that are audible to humans with average hearing. In particular, the intermodulation interference signals are produced by coupling at least two heating frequencies which have a frequency spacing from one another of less than 17 kHz.

To avoid intermodulation interference signals, the control unit can in particular in the Continuous heating mode and / or the initial heating mode for an activation scheme for activation of induction targets from an activation sequence catalog select an activation sequence. For example, in the continuous heating operating state and / or the initial heating operating state, the control unit could operate the induction targets with a substantially the same heating frequency in order to avoid intermodulation interference signals. Alternatively or additionally, the control unit could operate the induction targets with heating frequencies which differ by at least 17 kHz in the continuous heating mode and / or the initial heating mode to avoid intermodulation interference signals. For example, the control unit could alternatively or additionally deactivate at least one induction target in the continuous heating operating state and / or the initial heating operating state to avoid intermodulation interference signals and operate at least one further induction target different from the induction target with a specific heating frequency. Alternatively or additionally, the control unit in the continuous heating operating state and / or the initial heating operating state could operate the induction targets with control signals of the same heating frequency that are phase-shifted with respect to one another to avoid intermodulation interference signals.

A “power deficit” is to be understood in particular as a power whose mean value in relation to a time interval and / or an initial time interval falls below the average power of an induction target. In particular, the power deficit can be achieved by applying an alternating electromagnetic field with a heating frequency that is different from a target frequency, with a power required and / or set by the operator being provided when the induction target is operated with the target frequency. In particular, the power deficit can be achieved when the cooking appliance device is operated in a ZVS mode with a heating frequency that is higher than the target frequency. In particular, the power deficit can be achieved when the cooking appliance device is operated in a ZCS mode with a heating frequency which is lower than the target frequency.

An “energy supply” is to be understood in particular to mean the provision of electrical energy in the form of an electrical voltage, an electrical current and / or an electrical and / or electromagnetic field from at least one energy source. An “energy source” is to be understood in particular as a unit which provides electrical energy in the form of an electrical voltage, an electrical current and / or an electrical and / or electromagnetic field of at least one further unit and / or at least one electrical circuit. The energy source can in particular be an electrical current phase of a power supply network. In particular, the energy source can provide a maximum output of 3.7 kW. An inverter unit can advantageously be arranged between the energy source and at least one induction target, preferably all induction targets, in order to provide a high-frequency supply voltage with a suitable heating frequency. However, the energy source can in particular also have an inverter unit. In particular, the inverter unit can have at least one, in particular at least two or even more, inverters for providing a high-frequency supply voltage with a suitable heating frequency for induction targets.

An “induction target” is to be understood in particular to mean an inductor or a plurality of inductors, which / is in particular part of the cooking device device, with a cooking utensil set up above the inductor and / or the plurality of inductors, the inductor or the plurality of Inductors in at least one particularly special operating state, in particular in at least one continuous heating operating state and / or an initial heating operating state, in particular are jointly provided for inductively heating the cookware set up over the inductor or the plurality of inductors. The inductors of the induction target can each provide the same heating power in comparison with one another in at least the continuous heating operating state and / or the initial heating operating state. The control unit advantageously controls the inductors of an induction target with the same heating frequency. Furthermore, in particular a single inductor of the induction target can deliver a different heating power over time during at least the continuous heating operating state and / or the initial heating operating state. The control unit is in particular intended to define at least one induction target. In particular, the control unit can define several induction targets. The cooking device device has in particular at least one inductor, in particular a large number of inductors. An “inductor” is to be understood here in particular to mean an element which, in at least one continuous heating operating state and / or an initial heating operating state, supplies energy to at least one cookware for the purpose of heating the cookware, in particular in the form of an alternating magnetic field which is provided for this purpose in a metallic one , preferably at least partially to produce ferromagnetic heating means, in particular cookware, eddy currents and / or magnetic reversal effects, which are converted into heat. The inductor has, in particular, at least one induction coil and is in particular intended to use an alternating magnetic field with energy Feed the heating frequency to the cookware. The inductor is in particular arranged below and advantageously in the vicinity of at least one mounting plate of the cooking device device. In particular, the plurality of inductors can be arranged in a matrix, the inductors arranged in a matrix being able to form a variable cooking surface. In particular, the inductors can be combined with one another to form induction targets of any size, in particular with different contours. Alternatively, inductors can also be arranged in the form of a classic cooking mirror, in particular with two, three, four or five heating zones.

A “tolerance condition” is to be understood in particular to mean a condition which has at least one necessary and / or sufficient criterion, in the fulfillment of which the control unit can in particular initiate an execution of an operation, an algorithm, a computing operation and / or an event.

“Provided” is to be understood to mean, in particular, specially programmed, designed and / or equipped. The fact that an object is provided for a specific function should in particular be understood to mean that the object fulfills and / or executes this specific function in at least one application and / or operating state and / or continuous heating operating state.

In addition, it is proposed that the control unit be provided to allow flicker to be controlled in the control of the induction targets and to keep at least one flicker parameter within at least one admissibility interval. In particular, the flicker parameter represents a relationship between a change in a total output heating power in a time interval and / or initial time interval with respect to a previous time interval and / or initial time interval and a duration of the time interval and / or initial time interval. The admissibility interval is advantageously a maximum value of 400 Ws ^-1 . This can simplify the selection process of activation sequences for controlling the induction targets. This also enables a controlled load on a supply voltage network. “Flicker” is to be understood in particular as a subjective impression of an instability of a visual perception, which is caused in particular by a light stimulus whose luminance or spectral distribution fluctuates over time. In particular, flicker can be caused by a voltage change in a mains voltage and / or a change in a total output heating power.

In particular, a total output heating power of the induction targets falls below a total target heating power of the induction targets in at least one time interval and / or initial time interval. In particular, the total output heating power of the induction targets exceeds the total target heating power of the induction targets in at least one time interval and / or initial time interval. A “total output heating output” is to be understood in a continuous heating operating state and / or an initial heating operating state, in particular a sum of the output heating outputs of all induction targets in a time interval and / or initial time interval. An “output heating power” of an induction target is to be understood in particular as an electrical power which the control unit provides to the induction target in at least one continuous heating operating state and / or an initial heating operating state with at least one cookware set up for heating the cookware. For example, the output heating power could be characterized by at least one electrical current. In at least one continuous heating operating state and / or an initial heating operating state, the induction target could, for example, convert the output heating output in at least one line element of at least one inductor of the induction target at least partially, advantageously at least to a large extent and preferably completely into a heat flow and provide the heat flow in particular for heating at least one cookware . Alternatively or additionally, the inductor could provide, in particular in at least one continuous heating operating state and / or an initial heating operating state, in particular by means of the electric current, an especially high-frequency alternating electromagnetic field, which could be converted into heat in particular in a cookware. A “total target heating output” is to be understood as a sum of target heating outputs of all induction targets. In particular, the total target heating output has a constant value in all time intervals and / or initial time intervals over the entire operating period.

Furthermore, it is proposed that the tolerance condition represents a match of a total average heating power of the induction targets with respect to the entire operating period and / or initial operating period with a total target heating power within a deviation interval of at most 10% of the total target heating power. In this way, overloading of the supply network can be avoided in particular. In addition, a total target heating output requested by the operator can thereby advantageously be provided, as a result of which, in particular, a cooking process can be advantageously designed. In particular, the total average heating power of the induction targets in the individual time intervals and / or initial time intervals can fluctuate with respect to the total target heating power.

In addition, it is proposed that the operating parameter set have at least one unit heating frequency, which is a highest heating frequency, at which the induction targets provide the highest total output heating power in a common heating operation. In particular, this enables a common heating operation of all induction targets in a heating frequency range which is furthest from an unsafe heating frequency range. An “unsafe heating frequency range” is to be understood as a heating frequency range that, if a heating frequency from this heating frequency range is used, an unsafe heating operation takes place, in which in particular electrical currents, which in particular flow through electronic components of the cooking device device, can exceed a limit value and in particular cause damage and / or a failure of the cooking device and / or endanger the operator and / or overload the supply network.

It is further proposed that the control unit be provided to operate the induction targets with the standard heating frequency in at least a first initial time interval of the initial heating operating state. This enables a safe initiation of the initial heating mode. In particular, output heating powers of the induction targets in the first initial time interval form a basis for calculating output heating powers of the induction targets for further initial time intervals.

In addition, it is proposed that the control unit be provided for determining at least one auxiliary parameter set for determining at least one operating parameter set of at least one initial time interval of the initial heating operating state. In particular, the control unit is provided to determine at least one auxiliary parameter set in each case for the determination of operating parameter sets of all initial time intervals of the initial heating operating state. This allows a simplified determination of the control scheme. In particular, the auxiliary parameter set for the first initial time interval and for each induction target has difference values between a respective output heating power and a respective target heating power.

It is also proposed that the control unit be provided to recursively determine the auxiliary parameter set from auxiliary parameter sets of all initial time intervals that have preceded in particular. This in particular can reduce the time required to find a control scheme for controlling the induction targets. In particular, the control unit can determine the auxiliary parameter set for the initial time interval as a weighted sum of auxiliary parameter sets of all previous initial time intervals. In particular, the weighted sum has weights that are greater than or equal to 0. In particular, the weights, each with a length of the respective initial time interval, are linked to one another by a functional relationship. The weightings advantageously have a value equal to 1, as a result of which the lengths of the initial time intervals are advantageously the same.

In addition, it is proposed that the control unit be provided to determine at least one operating parameter set for the initial time interval from the auxiliary parameter set and to check this for feasibility. In particular, the operating parameter set has values for output heating powers of the induction targets. In particular, the control unit determines the operating parameter set and in particular the output heating powers for each initial time interval from a sum of the auxiliary parameter set and the target heating power. The control unit checks whether there is a suitable activation sequence for the initial time interval in the activation sequence catalog, by means of which the induction targets can supply the output heating powers determined by the control unit. In the event that the tolerance condition is fulfilled and there is feasibility, the control unit transfers the induction targets to the continuous heating operating state, the control unit in particular specifying the number and the respective lengths of the time intervals equal to the number and the respective lengths of the initial time intervals and a control scheme for controlling Induction targets determined.

In addition, it is proposed that the control unit be provided to change lengths of initial time intervals in the case of a lack of executability in the operating parameter set and in particular to check the executability of the new operating parameter set. As a result, in particular a flexible search method for determining the control scheme for controlling induction targets can be implemented. In particular, by changing the lengths of the initial time intervals, the control unit changes the weightings of the weighted sum for calculating auxiliary parameter sets and in particular for calculating output heating powers of the induction targets in the respective initial time interval. The control unit checks whether in the catalog of activation sequences there is a suitable activation sequence for the initial time interval, by means of which the induction targets can deliver the output heating powers determined by the control unit with changed lengths of the initial time intervals.

In addition, it is proposed that the control unit be provided to change the output heating powers of the induction targets in the initial time interval if there is a lack of feasibility in the operating parameter set and to operate them in the initial time interval with an optimized total output heating power, the control unit being intended to deviate from the optimized total output heating power by to minimize an overall target heating power in the initial time interval, all induction targets in the additional initial time interval each delivering an output heating power greater than 0. In this way, in particular a determination of optimal output heating powers of the respective induction targets can be prepared in the initial time interval. In particular, the control unit selects an activation sequence for the initial time interval from the catalog of activation sequences, which result in a minimal deviation of the total output heating power from the total target heating power, taking into account the flicker parameter.

Furthermore, it is proposed that the control unit be provided for introducing an additional initial time interval in the case of a lack of executability in the operating parameter set and in particular for determining an additional auxiliary parameter set for the additional initial time interval. In this way, in particular a termination of the determination of the control scheme for controlling induction targets can be avoided and the determination of the control scheme can be continued. In particular, the initial operating period has at least three initial time intervals if there is at least insufficient executability. In particular, the control unit determines the additional auxiliary parameter set from auxiliary parameter sets of all, in particular previous, initial time intervals.

Furthermore, it is proposed that the control unit be provided to operate all induction targets in the continuous heating mode in at least one, advantageously in exactly one time interval of the operating period together with the unit heating frequency. This enables, in particular, safe heating operation of the induction targets while avoiding dangers, in particular due to overloading of electrical components of the cooking device device, for example due to an excessively high current.

In addition, it is proposed that the control unit be provided to determine at least one dependency of an output heating power on a heating frequency for each induction target before the initial heating operating state. In particular, the control unit determines the dependence of the output heating power on a heating frequency for each induction target individually. In particular, the output heating power is dependent on a heating frequency with a nature of the inductors, the cooking utensils and / or a positioning of the cooking utensils above the inductor. In particular, the output heating power in the ZVS mode is a monotonically falling, in particular strictly monotonically falling, function of the heating frequency.

In addition, a cooking device, in particular a hob, is proposed with at least one cooking device device according to the invention, as a result of which, in particular, low-noise operation and advantageously a simplified and in particular time-saving determination of activation sequences for controlling the induction targets can take place.

The invention is also based on a method for operating a cooking device device, in particular a cooktop device, in which at least one first induction target and at least one second induction target are controlled in a periodic continuous heating operating state with an operating period and are supplied with electrical energy.

It is proposed that in an initial heating operating state at least one operating parameter is determined and the induction targets are converted to the permanent heating operating state when at least one tolerance condition is met and are operated taking into account the operating parameter.

The configuration according to the invention enables, in particular, simplified control and, in particular, low-noise operation. Simplified control can significantly reduce the effort required to find feasible control schemes. In this way, in particular inexpensive and / or less powerful components can be used. The effort to control a desired heating output desired by an operator can advantageously be reduced with a number of induction targets. In particular, simple performance control can be made possible. In particular, lengths of time intervals of an operating period and / or of initial time intervals of an initial operating period can in particular be determined analytically, as a result of which physically useful values for the lengths of the time intervals and / or the initial time intervals can advantageously be calculated. In particular, the time intervals can thereby be adjusted in a balanced manner and the length of the time intervals can advantageously be of the same size. In particular, activation of the induction targets can be implemented, in which a number of time intervals is less than a number of induction targets, as a result of which the complexity of the activation can be reduced. This can In particular, an unfavorable acoustic load on an operator can be avoided, as a result of which, in particular, a high level of operating comfort and, in particular, a positive operating impression can be achieved with the operator, in particular with regard to acoustic quality. Flicker can preferably be according to a flicker standard, in particular according to the DIN EN 61000-3-3 standard , can be at least largely avoided by advantageously controlling individual induction targets. In particular, a reliable configuration can preferably be achieved in relation to a target heating output requested by the operator. In particular, several induction targets can advantageously be operated simultaneously with low noise and with a flicker-controlled load on a supply network.

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

Further advantages result from the following description of the drawing. In the drawing, an embodiment of the invention is 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 useful further combinations.

• 1 ein Kochfeld mit einer Gargerätevorrichtung,
• 2 die Gargerätevorrichtung mit drei von einer Steuereinheit der Gargerätevorrichtung definierten Induktionszielen,
• 3 eine beispielhafte Darstellung eines aus dem Stand der Technik bekannten Ansteuerungsschemas für vier Induktionsziele,
• 4 eine beispielhafte Darstellung eines weiteren aus dem Stand der Technik bekannten Ansteuerungsschemas für vier Induktionsziele,
• 5 ein Ablaufdiagramm eines Suchschritts eines aus dem Stand der Technik bekannten Verfahrens zur Bestimmung des bekannten Ansteuerungsschemas,
• 6 eine beispielhafte Darstellung eines erfindungsgemäßen Ansteuerungsschemas für drei Induktionsziele mit zwei Zeitintervallen,
• 7 eine beispielhafte Darstellung des erfindungsgemäßen Ansteuerungsschemas für fünf Induktionsziele mit zwei Zeitintervallen,
• 8 eine beispielhafte Darstellung des erfindungsgemäßen Ansteuerungsschemas für vier Induktionsziele mit drei Zeitintervallen,
• 9 ein Verfahrensdiagramm des erfindungsgemäßen Verfahrens zum Betrieb der Gargerätevorrichtung und
• 10 ein beispielhaftes erfindungsgemäßes Ablaufdiagramm eines Suchschritts des erfindungsgemäßen Verfahrens.

Show it:

• 1 a hob with a cooking device,
• 2nd the cooking device with three induction targets defined by a control unit of the cooking device,
• 3rd 1 shows an exemplary representation of a control scheme for four induction targets known from the prior art,
• 4th 2 shows an exemplary representation of a further control scheme for four induction targets known from the prior art,
• 5 1 shows a flowchart of a search step of a method known from the prior art for determining the known control scheme,
• 6 1 shows an exemplary representation of a control scheme according to the invention for three induction targets with two time intervals,
• 7 an exemplary representation of the control scheme according to the invention for five induction targets with two time intervals,
• 8th an exemplary representation of the control scheme according to the invention for four induction targets with three time intervals,
• 9 a process diagram of the inventive method for operating the cooking device and
• 10th an exemplary flow chart of a search step of the method according to the invention.

1 shows a cooking appliance 30th which as a hob 32 is trained. The cooking appliance 30th is as an induction hob 40 educated. The cooking appliance 30th is a classic induction hob 38 with four cooking zones 82 educated. However, it would also be conceivable that the cooking device 30th is designed as a matrix hob, or a different number of permanently defined cooking zones 82 having.

Three of the four cooking zones 82 are each with a cookware 44 busy. The cooking appliance 30th has a cooking device 10th on. The cooking device 10th is designed as an induction hob device.

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

The cooking device 10th has a stand 42 on. The stand plate 42 is for setting up cookware 44 intended. In the present embodiment, the base plate 42 designed as a hob plate.

The cooking device 10th has a variety of inductors 36 on. An inductor 36 is exactly one cooking zone 82 assigned. It is conceivable that in the case of a matrix hob, the inductors 36 are arranged in a matrix. In the present exemplary embodiment, the cooking appliance device has 10th four inductors 36 on. The inductors 36 are each under the respective cooking zone 82 arranged. Any inductor 36 has at least one induction coil.

The inductors 36 are in an installed state below the base plate 42 arranged. The inductors 36 are each provided in a continuous heating mode on the stand 42 above the respective inductor 36 set up cookware 44 to heat.

The cooking device 10th has a control panel 34 for input and / or selection of operating parameters by an operator, for example a target heating output 24th and / or a cooking time. The control panel 34 is as a display 46 educated. The control panel 34 is to an issue a value of an operating parameter is provided to the operator.

The cooking device 10th has a control unit 12 on. The control unit 12 is provided depending on operating parameters entered by an operator, such as a target heating output 24th and / or a cooking time, executing actions and / or algorithms and / or changing settings.

Based on those on the stand 42 set up cookware 44 defines the control unit 12 Induction goals 14 , 50 , 66 . In the present example there are three induction targets 14 , 50 , 66 by the control unit 12 based on those on the stand 42 set up cookware 44 and on the inductors 36 over which the cookware 44 are defined. An induction target 14 , 50 , 66 has exactly one inductor 36 on. Alternatively, an induction target 14 , 50 , 66 several inductors 36 exhibit. An induction target 14 , 50 , 66 has at least one cookware 44 on. The control unit 12 can have a variety of induction targets 14 , 50 , 66 define.

An output heating output 48 of any induction target 14 , 50 , 66 is significant from that at the induction target 14 , 50 , 66 heating frequency applied. The output heating power is in a ZVS mode 48 an induction target 14 , 50 , 66 a monotonically falling function of the heating frequency. The output heating power increases in the ZVS mode 48 an induction target 14 , 50 , 66 with decreasing heating frequency. The output heating power is in a ZCS mode 48 an induction target 14 , 50 , 66 a monotonously increasing function of the heating frequency. The output heating power drops in the ZCS mode 48 an induction target 14 , 50 , 66 with increasing heating frequency. The control unit 12 operates the cooking device 10th in ZVS mode.

An energy source supplies in the continuous heating mode 106 the induction targets 14 , 50 , 66 with an electrical energy. The energy source is an electrical current phase of a power supply network. The cooking device 10th each has an inverter unit 70 , 84 , 88 to provide at least one heating frequency for the respective induction target 14 , 50 , 66 on (cf. 2nd ).

The control unit 12 is in the continuous heating mode 106 for repetitive control and power supply of the first induction target 14 , the second induction target 50 and the third induction target 66 provided from the energy source. The control unit 12 is in the continuous heating mode 106 for periodic activation and energy supply of the induction targets 14 , 50 , 66 intended.

2nd shows an embodiment of the cooking device 10th with three from the control unit 12 the cooking device 10th defined induction goals 14 , 50 , 66 . The control unit 12 defines a first, a second and a third induction target 14 , 50 , 66 . The cooking device 10th has a first, a second and a third resonant inverter unit 70 , 84 , 88 on. The inverter units 70 , 84 , 88 set a heating frequency for the induction targets 14 , 50 , 66 ready. The first inverter unit 70 is the first induction target 14 assigned. The second inverter unit 84 is the second induction target 50 assigned. The third inverter unit 88 is the third induction target 66 assigned. The inverter units 70 , 84 , 88 supply the induction targets 14 , 50 , 66 independently of each other with electrical energy.

The cooking device 10th each has an electromechanical switch element 60 per one induction target 14 , 50 , 66 on. The switch elements 60 are each as relays 62 educated. The induction goals 14 , 50 , 66 are through the relays 62 switchable to the electrical power supply. The cooking device 10th each has a resonance capacitor unit 28 per one induction target 14 , 50 , 66 on. Any induction target 14 , 50 , 66 can be controlled individually with a respective heating frequency.

3rd , 4th and 5 reflect the current state of the art. 3rd and 4th each show a control scheme known from the prior art 64 for four induction targets with a corresponding S matrix 56 . Corresponding deviations from the output heating outputs of the induction targets in the individual time intervals compared to the target heating outputs are in the form of the S matrix 56 shown. The S matrix 56 contains characters + and -. The plus sign + stands for a surplus of performance 20th . The minus sign - stands for a performance deficit 22 . The output heating powers that correspond to the respective target heating powers are shown as zeros. The S matrix 56 gives that in 3rd or 4th shown control scheme 64 again.

In 5 is a flowchart of a search step 90 a known method for determining the known control scheme 64 out 3rd and 4th shown. The search step 90 of the known method has a frequency sweep substep 92 on. In the frequency sweeping sub-step 92 target frequencies are determined at which the induction targets each provide a target heating power. The search step 90 of the known method has a search sub-step 96 on. In the search sub-step 96 becomes an S matrix 56 determined and then in a selection step 110 for each time interval an activation sequence from a catalog of activation sequences is sought, which Output heating powers corresponding to a respective column in the S matrix 56 delivers. It will be two test steps 100 carried out, the activation sequences found using the S matrix 56 be compared. In the event that the control unit 12 cannot find a suitable activation sequence, a repeat 114 of the search sub-step 96 looped until a suitable activation sequence is found. This disadvantageously increases the time and / or computational effort required to determine the control scheme 64 . Only when all test conditions of both test part steps 100 are met, a continuous heating mode 106 initiated.

The following description and 6 to 10th now illuminate the invention in detail.

The control unit 12 operates the induction targets 14 , 50 , 66 in an initial heating mode 104 and then in the continuous heating mode 106 . The initial heating mode 104 and the continuous heating mode 106 are different from each other. In the case of a newly defined induction target 14 , 50 , 66 directs the control unit 12 the initial heating mode 104 and the subsequent continuous heating mode 106 a. A new induction target 14 , 50 , 66 defines the control unit 12 in the case of a new one on one of the cooking zones 82 set up cookware 44 and / or in the event of a shift in the cookware already set up 44 from a cooking zone 82 to another cooking zone 82 .

The control unit 12 starts and ends the initial heating mode 104 before the continuous heating mode 106 . In the initial heating mode 104 operates the control unit 12 the induction targets 14 , 50 , 66 in an initial operating period 76 with at least two initial time intervals 74 .

The control unit 12 determined before the initial heating mode 104 for each induction target 14 , 50 , 66 a dependency of the output heating power 48 from the heating frequency. The control unit 12 operates the induction targets 14 , 50 , 66 in ZVS mode. By means of the dependence of the output heating power 48 determines the control unit 12 for each induction target 14 , 50 , 66 a minimum limit heating frequency f _MIN which have a maximum output heating power 48 of the respective induction target 14 , 50 , 66 with safe operation of the respective induction target 14 , 50 , 66 allowed.

The control unit 12 determined in the initial heating mode 104 an operating parameter set for the continuous heating operating state 106 . The operating parameter set has a standard heating frequency. The induction targets are set when the unit heating frequency is applied 14 , 50 , 66 in the case of a common heating operation, the highest total output heating output 52 with safe operation of the cooking device 10th ready. The unit heating frequency represents a least aggressive activation sequence 58 The unit heating frequency is greater than the highest limit heating frequency f _MIN of induction goals 14 , 50 , 66 .

The control unit 12 operates the induction targets 14 , 50 , 66 in a first initial time interval 74 with the standard heating frequency.

In the initial heating mode 104 forms the control unit 12 a performance matrix P

In the performance matrix P are output heating outputs 48 of induction goals 14 , 50 , 66 summarized. Individual columns of the performance matrix P are part of the operating parameter set: $$P=\left(\begin{array}{cccc}{P}_{11}& {\mathrm{<figure-callout\; id="12"\; label="P"\; filenames="DE102019218792A1\_0013.png"\; state="\{\{state\}\}">P</figure-callout>}}_{12}& ...& P_{1\text{N}}\\ P_{\mathrm{<figure-callout\; id="22"\; label="21st\; P"\; filenames="DE102019218792A1\_0017.png"\; state="\{\{state\}\}">21st\; </figure-callout>}}& P_{}{}_{22}& ...& P_{\text{2N}}\\ ...& ...& ...& ...\\ P_{\text{M1}}& P_{\text{M2}}& ...& P_{\text{MN}}\end{array}\right)$$

A number of lines M the performance matrix P is equal to a number of induction targets 14 , 50 , 66 . A number of columns N the performance matrix P is equal to a number of the initial time interval 74 . The number of columns N the performance matrix P is less than the number of lines M the performance matrix P . A component PMN gives an output heating power 48 of an Mth induction target 14 , 50 , 66 in an Nth initial time interval 74 at. For example, there is a component P ₁₁ an output heating power 48 of the first induction target 14 in the first initial time interval 74 at.

In the initial heating mode 104 forms the control unit 12 a target heating power vector b .

In the target heating power vector b are from one operator for the induction targets 14 , 50 , 66 requested heating output 24th PTM summarized. The target heating power vector b is a column vector of length M . An Mth component b _M of the target heating power vector b gives a target heating output set by the operator 24th of an Mth induction target 14 again. A second component b ₂ of the target heating power vector b gives, for example, a target heating output set by the operator 24th P _T2 of the second induction target 50 again: $$b=\left(\begin{array}{c}{P}_{\text{T1}}\\ P_{\text{T2}}\\ ...\\ P_{\text{TM}}\end{array}\right)$$

The control unit 12 determined in the initial heating mode 104 an auxiliary parameter set for determining the operating parameter set of the second initial time interval 74 . In the initial heating mode 104 forms the control unit 12 an auxiliary parameter set matrix Δ: $$\Delta \mathrm{=}\left(\begin{array}{cccc}\mathrm{\Delta }{P}_{11}& \mathrm{<figure-callout\; id="12"\; label="\Delta \; P"\; filenames="DE102019218792A1\_0013.png"\; state="\{\{state\}\}">\Delta \; </figure-callout>}{P}_{}{}_{12}& ...& \mathrm{\Delta }{P}_{1\text{n}}\\ \mathrm{\Delta }{P}_{\mathrm{<figure-callout\; id="22"\; label="21st\; \Delta \; P"\; filenames="DE102019218792A1\_0017.png"\; state="\{\{state\}\}">21st\; </figure-callout>}}& \mathrm{\Delta }{P}_{}{}_{22}& ...& \mathrm{\Delta }{P}_{\mathrm{2nd}\text{n}}\\ ...& ...& ...& ...\\ \mathrm{\Delta }{P}_{\text{M1}}& \mathrm{\Delta }{P}_{\text{M2}}& ...& \mathrm{\Delta }{P}_{\text{Mn}}\end{array}\right)$$

n represents a number of already determined auxiliary parameter sets. Determines the control unit, for example 12 an auxiliary parameter set for the second initial time interval 74 , n = 1. The auxiliary parameter set matrix Δ indicates a successful search for a control scheme 64 same dimensions as the performance matrix P on. Columns of the auxiliary parameter set matrix Δ each set an auxiliary parameter set for an initial time interval 74 . The first column of the auxiliary parameter set matrix Δ represents a difference from the output heating powers 48 the first initial time interval 74 and the target heating power vector b For example, a component Δ ₁₁ = ΔP ₁₁ gives a difference from the output heating power 48 of the first induction target 14 in the first initial time interval 74 and the target heating output 24th of the first induction target 14 at. The induction goals 14 , 50 , 66 deliver the output heating outputs when the unit heating frequency is applied 48 the first initial time interval 74 .

The control unit 12 determined for one of a first initial time interval 74 different initial time interval 74 an auxiliary parameter set from auxiliary parameter sets of all previous initial time intervals 74 . DThe auxiliary parameter set for the second initial time interval 74 determines the control unit 12 from auxiliary parameter sets of all previous initial time intervals 74 . The auxiliary parameter set for the second initial time interval 74 determines the control unit 12 according to the following formula: $${\Delta }_{\text{n}+1}=-\Delta \mathrm{\theta \; =\; -}\left(\begin{array}{c}{\displaystyle \sum _{j=1}^n{\mathrm{\theta }}_{\text{j}}\mathrm{\Delta }{P}_{1\text{j}}}\\ {\displaystyle \sum _{j=1}^n{\mathrm{\theta }}_{\text{j}}\mathrm{\Delta }{P}_{\mathrm{2nd}\text{j}}}\\ ...\\ {\displaystyle \sum _{j=1}^n{\mathrm{\theta }}_{\text{j}}\mathrm{\Delta }{P}_{\text{Mj}}}\end{array}\right)$$

θ is a weight vector with weights for the weighted sum: $$\theta \mathrm{=}\left(\begin{array}{c}{\mathrm{<figure-callout\; id="1"\; label="\theta "\; filenames="DE102019218792A1\_0017.png,DE102019218792A1\_0020.png"\; state="\{\{state\}\}">\theta </figure-callout>}}_1\\ {\mathrm{\theta }}_{\mathrm{2nd}}\\ ...\\ {\mathrm{\theta }}_{\text{n}}\end{array}\right)$$

In 6 is an exemplary representation of a control scheme according to the invention 64 for three induction targets 14 , 50 , 66 with two time intervals 18th shown.

The output heating powers 48 of induction goals 14 , 50 , 66 when operating the induction targets 14 , 50 , 66 with the unit heating frequency in the first initial time interval 74 form the first column of the performance matrix P . In the present case, the first column shows the performance matrix P following entries: (580; 950; 1060) ^T on. The first column of the performance matrix P is part of the operating parameter set for the first initial time interval 74 .

In the present case, the target heating power vector could b look like this: $$b=\left(\begin{array}{c}1000\\ 800\\ 700\end{array}\right)$$

The control unit 12 determined for the determination of the operating parameter set of the second initial time interval 74 in the initial heating mode 104 a first set of auxiliary parameters. The first auxiliary parameter set forms a first column of the auxiliary parameter set matrix Δ . The first column of the auxiliary parameter set matrix Δ represents a difference from the output heating powers 48 the first initial time interval 74 and the target heating power vector b The first column of the auxiliary parameter set matrix Δ in the present case (-420, +150, +360) is ^T.

The control unit determines according to equation [1] 12 the second set of auxiliary parameters. The control unit preferably sets 12 same weights θ = (1; 1; 1; 1) ^T a. Alternatively, the control unit 12 different weights in each case θ _τ and / or weights different from 1 deploy. The weights assume values greater than or equal to 0. The second set of auxiliary parameters is (+420; -150; -360) ^T. For example, the auxiliary parameter set matrix Δ in the present case look like this: $$\Delta =\left(\begin{array}{cc}-420& +420\\ +150& -150\\ +360& -360\end{array}\right)$$

The second column of the performance matrix P determines the control unit 12 from a sum of second column of the auxiliary parameter set matrix Δ and the target heating power vector b . The second column of the performance matrix P is part of the second set of operating parameters. In the present case, the performance matrix P look like this: $$P=\left(\begin{array}{cc}580& 1420\\ 950& 650\\ 1060& 340\end{array}\right)$$

The control unit 12 checks the second set of operating parameters for feasibility. The control unit 12 searches for an activation sequence from a catalog of activation sequences 58 . The control unit 12 selects the activation sequence from the catalog 58 of induction goals 14 , 50 , 66 where the induction targets 14 , 50 , 66 the required output heating outputs 48 according to the second column of the performance matrix P can deliver (cf. 6 ).

The control unit selects to avoid intermodulation interference signals 12 an activation sequence from a catalog of activation sequences 58 out. For example, the control unit 12 to avoid intermodulation interference signals all induction targets 14 , 50 , 66 operate at least essentially with a substantially the same heating frequency.

Alternatively or additionally, the control unit could 12 the first induction target to avoid intermodulation interference signals 14 , the second induction target 50 and the third induction target 66 each operate with heating frequencies that differ by at least 17 kHz.

For example, the control unit 12 alternatively or additionally to avoid intermodulation interference signals at least one of the induction targets 14 , 50 , 66 disable and at least one of the induction targets 14 , 50 , 66 operate with a certain heating frequency, the operated induction target 14 , 50 , 66 are operated with the same heating frequency or with heating frequencies which have a mutual frequency spacing of at least 17 kHz.

The control unit 12 determines feasibility in the present case.

The control unit 12 determined in the initial heating mode 104 a length of the initial operating period 76 . The control unit 12 determined in the initial heating mode 104 a number of initial time intervals 74 . The control unit 12 determined in the initial heating mode 104 a relative length of initial time intervals 74 . The control unit 12 summarizes the relative lengths in a length vector x together. The length vector x can be determined according to the following equation: $$x=\frac{1}{1+{\displaystyle \sum _{i=1}^n{\mathrm{\theta }}_i}}\left(\begin{array}{c}{\mathrm{<figure-callout\; id="1"\; label="\theta "\; filenames="DE102019218792A1\_0017.png,DE102019218792A1\_0020.png"\; state="\{\{state\}\}">\theta </figure-callout>}}_1\\ {\mathrm{\theta }}_{\mathrm{2nd}}\\ ...\\ {\mathrm{\theta }}_{\text{n}}\\ 1\end{array}\right)$$

The length vector x is (0.5; 0.5) ^T in the present case. The relative length gives a portion of an initial time interval 74 at the initial operating period 76 T again: $$x=\frac{1}{T}\left(\begin{array}{c}{t}_1\\ t_{\mathrm{2nd}}\\ ...\\ t_{\text{N}}\end{array}\right)$$

The control unit 12 determined in the initial heating mode 104 a control scheme 64 to control induction targets 14 , 50 , 66 .

The control unit 12 checks in the initial heating mode 104 fulfilling a tolerance condition. The tolerance condition is a match of an overall average heating power 86 of induction goals 14 , 50 , 66 in relation to the entire initial operating period 76 with a total target heating capacity 54 within a deviation interval of a maximum of 10% of the total target heating output 54 In the present case, the total average heating power is correct 86 of induction goals 14 , 50 , 66 with the total target heating output 54 within the deviation interval.

The control unit 12 transfers the induction targets 14 , 50 , 66 in the continuous heating mode 106 .

The control unit 12 sets a length of an operating period 16 of the continuous heating mode 106 firmly. The length of the operating period 16 is equal to the length of the initial operating period 76 . The control unit 12 sets a number of time intervals 18th the operating period 16 firmly. The number of time intervals 18th is equal to the number of initial time intervals 74 . The control unit 12 sets a length of time intervals 18th firmly. The length of the time intervals 18th is equal to the length of the initial time intervals 74 .

The control unit 12 operates in the continuous heating mode 106 the induction targets 14 , 50 , 66 while avoiding intermodulation interference signals (cf. 6 , 7 and 8th ). In the continuous heating mode 106 regulates the control unit 12 the Output heating powers 48 of induction goals 14 , 50 , 66 via a respective heating frequency.

The control unit 12 operates in the continuous heating mode 106 the induction targets 14 , 50 , 66 periodically over an entire cooking time. The cooking time is in operating periods 16 divided up.

The control unit 12 operates the induction targets 14 , 50 , 66 in the two time intervals 18th each with an activation sequence 58 . A sequence of activation sequences 58 is interchangeable. The control unit 12 operates in continuous heating mode 106 in the first time interval 18th the operating period 16 all induction targets 14 , 50 , 66 together with the unit heating frequency. The control unit 12 operates in the second time interval 18th the second and third induction target 50 , 66 with a common heating frequency. The control unit 12 operates in the second time interval 18th the first induction target 14 with a heating frequency which is a frequency distance of at least 17 kHz from the heating frequency of the second and third induction target 50 , 66 having.

The control unit 12 leaves when controlling the induction targets 14 , 50 , 66 Flicker controls too. A difference ΔP gives a greatest difference between the total output heating powers 52 of neighboring time intervals 18th in a continuous continuous heating mode 106 at. The difference ΔP based on a duration of the operating period 16 determines a flicker parameter 26 . The control unit 12 keeps the flicker parameter 26 within an admissibility interval. The admissibility interval is according to a flicker standard, in particular according to the DIN EN 61000-3-3 standard , regulated.

7 shows an exemplary representation of a control scheme according to the invention 64 for five induction targets 14 , 50 , 66 , 68 , 72 with two time intervals 18th . The following description is essentially limited to the differences between the representations of the control schemes, with the description of the exemplary embodiment of FIG 6 can be referred.

The control unit 12 operates in a first initial time interval 74 of the initial heating mode 104 all induction targets 14 , 50 , 66 , 68 , 72 together with a unit heating frequency. The induction goals 14 , 50 , 66 , 68 , 72 deliver an output heating output when the unit heating frequency is applied 48 .

The output heating powers 48 of induction goals 14 , 50 , 66 , 68 , 72 represent a first column of the performance matrix P The first column of the performance matrix P is part of the operating parameter set of the first initial time interval 74 .

The control unit 12 determines the first auxiliary parameter set. The control unit 12 determines the second auxiliary parameter set from the first auxiliary parameter set. The control unit 12 determines the operating parameter set from the second auxiliary parameter set with a weighting θ = 1 for the second initial time interval 74 .

The control unit 12 checks the operating parameter set for feasibility. The control unit 12 searches for an activation sequence from the catalog of activation sequences 58 what output heating powers 48 can deliver according to the operating parameter set. The control unit 12 notes a lack of feasibility.

The control unit 12 changes lengths of initial time intervals 74 . The control unit 12 chooses a new weighting θ . The control unit 12 determines a new second auxiliary parameter set. The control unit 12 determines the new operating parameter set from the new second auxiliary parameter set. The control unit 12 forms a performance matrix P . The control unit 12 checks the new operating parameter set for feasibility. The control unit 12 searches for an activation sequence from the catalog of activation sequences 58 what output heating powers 48 can deliver according to the new operating parameter set. The control unit 12 looks for a weight θ which is executable. The control unit 12 puts a new weight θ of 1.5 fixed. The control unit 12 finds an activation sequence in the catalog of activation sequences 58 what output heating powers 48 according to the new set of operating parameters. The control unit 12 determines the feasibility of the new operating parameter set.

The control unit 12 determines compliance with the tolerance condition. In the present case, it is feasible and the tolerance condition to be met in a control scheme 64 with two initial time intervals 74 given. The control unit 12 transfers the induction targets 14 , 50 , 66 in the continuous heating mode 106 .

The control unit 12 sets a length of an operating period 16 of the continuous heating mode 106 firmly. The length of the operating period 16 is equal to the length of the initial operating period 76 . The control unit 12 sets a number of time intervals 18th the operating period 16 firmly. The number of time intervals 18th is equal to the number of initial time intervals 74 . The control unit 12 sets a length of time intervals 18th firmly. The length of the time intervals 18th is equal to the length of the initial time intervals 74 .

The control unit 12 operates the induction targets 14 , 50 , 66 , 68 , 72 in the two time intervals 18th each with an activation sequence 58 . A sequence of activation sequences 58 is interchangeable. The control unit 12 operates in continuous heating mode 106 in the first time interval 18th the operating period 16 all induction targets 14 , 50 , 66 , 68 , 72 together with the unit heating frequency. The control unit 12 operates in the second time interval 18th the first, second and third induction target 14 , 50 , 66 with a common heating frequency. The control unit 12 operates in the second time interval 18th the fourth and fifth induction target 68 , 72 with another common heating frequency. The common heating frequency of the first, second and third induction target 14 , 50 , 66 and the further common heating frequency of the fourth and fifth induction target 68 , 72 have a frequency separation of at least 17 kHz.

The performance matrix P , the auxiliary matrix Δ , the target heating power vector b and length vector x are shown below: $$\Delta =\left(\begin{array}{cc}-300& +450\\ -450& +675\\ -250& +375\\ +500& -750\\ +700& -1050\end{array}\right);b=\left(\begin{array}{c}700\\ 900\\ 550\\ 1200\\ 1350\end{array}\right)\Rightarrow P=\left(\begin{array}{cc}400& 1150\\ 450& 1575\\ 300& 925\\ 1700& 450\\ 2050& 350\end{array}\right);x=\left(\begin{array}{c}0.6\\ 0.4\end{array}\right)$$

8th shows an exemplary representation of a control scheme according to the invention 64 for four induction targets 14 , 50 , 66 , 68 with three time intervals 18th . The following description is essentially restricted to the differences between the representations of the control schemes, with the description of the exemplary embodiment of FIG 6 and 7 can be referred.

The control unit 12 determines an operating parameter set of the first initial time interval 74 . The control unit 12 determines an operating parameter set of the second initial time interval 74 . The control unit 12 selects a weighting θ = 1. The control unit 12 checks the operating parameter set of the second initial time interval 74 on feasibility. The control unit 12 notes a lack of feasibility. The control unit 12 changes lengths of initial time intervals 74 . The control unit 12 chooses a new weighting θ . The control unit 12 determined for each new value of the weighting θ a new operating parameter set of the second initial time interval 74 . The control unit 12 checks for each new value of the weighting θ the new operating parameter set of the second initial time interval 74 on feasibility. The control unit 12 determines a lack of executability for all values for the weighting θ .

The control unit 12 changes the output heating output due to the lack of feasibility in the operating parameter set 48 of induction goals 14 , 50 , 66 , 68 in the second initial time interval 74 . The control unit 12 searches for an activation sequence in the activation sequence catalog 58 which is an optimized total heating output 52 delivers. The control unit 12 operates the induction targets 14 , 50 , 66 , 68 in the second initial time interval 74 with an optimized total heating output 52 . The control unit 12 minimizes a deviation in the optimized total output heating output 52 of a total target heating output 54 in the second initial time interval 74 . The induction goals 14 , 50 , 66 , 68 deliver in the additional initial time interval 74 one output heating output each 48 greater than 0.

The control unit 12 determines the second set of auxiliary parameters as the difference between the output heating outputs 48 the second initial time interval 74 and the target heating power vector b .

The control unit 12 leads to an additional third initial time interval if it is not executable 74 a. The control unit 12 determined for the additional third initial time interval 74 an additional set of auxiliary parameters.

The auxiliary parameter set for the third initial time interval 74 determines the control unit 12 from auxiliary parameter sets of the first and second initial time interval 74 . The control unit 12 determines an operating parameter set of the third initial time interval 74 . The control unit 12 selects a weighting θ = 1. With the weighting θ = 1 are the lengths of the initial time intervals 74 same length (see equation [2]). The control unit 12 checks the operating parameter set of the third initial time interval 74 on feasibility. The control unit 12 determines feasibility.

The control unit 12 determines compliance with the tolerance condition. In the present case, it is feasible and the tolerance condition to be met in a control scheme 64 with three initial time intervals 74 given.

The control unit 12 operates the induction targets 14 , 50 , 66 , 68 in initial heating mode 104 in the first initial time interval 74 with the standard heating frequency.

The control unit 12 dials for the second initial time interval 74 an activation sequence from the catalog of activation sequences 58 which have an optimized total output heating output 52 delivers. The control unit 12 operates in the second initial time interval 74 the first and second induction target 14 , 50 with a common heating frequency. The control unit 12 operates in the second initial time interval 74 the third and fourth induction target 66 , 68 with another common heating frequency. The common heating frequency of the first and second induction target 14 , 50 and the further common heating frequency of the third and fourth induction target 66 , 68 have a frequency separation of at least 17 kHz.

The control unit 12 dials for the third initial time interval 74 an activation sequence from the catalog of activation sequences 58 what output heating powers 48 according to the operating parameter set of the third initial time interval 74 can deliver. The control unit 12 operates in the third initial time interval 74 the first and second induction target 14 , 50 with a common heating frequency. The control unit 12 operates in the third initial time interval 74 the third and fourth induction target 66 , 68 with another common heating frequency. The common heating frequency of the first and second induction target 14 , 50 and the further common heating frequency of the third and fourth induction target 66 , 68 have a frequency separation of at least 17 kHz.

The control unit 12 transfers the induction targets 14 , 50 , 66 , 68 from the initial heating mode 104 in the continuous heating mode 106 .

An order of in the initial heating mode 104 certain activation sequences 58 is in continuous heating mode 106 interchangeable. The order of the activation sequences 58 is in continuous heating mode 106 vice versa. The first initial time interval 74 corresponds to the third time interval 18th . The third initial time interval 74 corresponds to the first time interval 18th .

The control unit 12 sets a length of an operating period 16 of the continuous heating mode 106 firmly. The length of the operating period 16 is equal to the length of the initial operating period 76 . The control unit 12 sets a number of time intervals 18th the operating period 16 firmly. The number of time intervals 18th is equal to the number of initial time intervals 74 . The control unit 12 sets a length of time intervals 18th firmly. The length of the time intervals 18th is equal to the length of the initial time intervals 74 .

An exemplary performance matrix P , the auxiliary matrix Δ , the target heating power vector b and length vector x for the present case are shown below: $$\Delta =\left(\begin{array}{ccc}+500& -400& -100\\ +200& -100& -100\\ -100& +300& -200\\ -300& +400& -100\end{array}\right);b=\left(\begin{array}{c}750\\ 1300\\ 650\\ 900\end{array}\right)\Rightarrow P=\left(\begin{array}{ccc}1250& 350& 650\\ 1500& 1200& 1200\\ 550& 950& 450\\ 600& 1300& 800\end{array}\right);x=\left(\begin{array}{c}0.33\\ 0.33\\ 0.33\end{array}\right)$$

9 shows a method for operating the cooking device 10th .

In a determination step 80 the method is in an initial heating mode 104 a number of induction targets 14 , 50 , 66 , 68 , 72 detected.

In one search step 90 of the method is in the initial heating mode 104 for each initial time interval 74 one activation sequence each 58 a control scheme 64 wanted (cf. 9 ). The activation sequences 58 form a control scheme 64 . Output heating powers 48 of induction goals 14 , 50 , 66 , 68 , 72 at initial time intervals 74 be determined. The activation sequences 58 have intermodulation interference-free controls for the induction targets 14 , 50 , 66 , 68 , 72 using heating frequencies from a catalog of activation sequences 58 on. By controlling the induction targets 14 , 50 , 66 , 68 , 72 with the activation sequences 58 are the specific output heating outputs 48 provided.

In one application step 108 of the process become the induction targets 14 , 50 , 66 , 68 , 72 when the tolerance condition from the initial heating mode is met 104 in a continuous heating mode 106 transferred. The induction goals 14 , 50 , 66 , 68 , 72 are in the continuous heating mode 106 according to the control scheme 64 taking into account the length vector x operated.

10th shows an exemplary flow chart of the search step according to the invention 90 of the procedure.

The search step 90 after the discovery step 80 initiated. The search step 90 has a frequency sweep substep 92 on. In the frequency sweeping sub-step 92 are for each induction target 14 , 50 , 66 , 68 , 72 a dependency of the output heating power 48 determined by the heating frequency. By means of the dependence of the output heating power 48 is for each induction target 14 , 50 , 66 , 68 , 72 a minimum limit heating frequency f _MIN determines which is a maximum output heating power 48 of the respective induction target 14 , 50 , 66 , 68 , 72 with safe operation of the respective induction target 14 , 50 , 66 , 68 , 72 allowed. In the frequency sweeping sub-step 92 target frequencies are determined at which the induction targets 14 , 50 , 66 , 68 , 72 one target heating output each 24th provide.

The search step 90 has a frequency search sub-step 94 on. In the frequency search sub-step 94 for the first initial time interval 74 a least aggressive activation sequence 58 determined. As a least aggressive activation sequence 58 a standard heating frequency is set.

The search step 90 has a search sub-step 96 on. In the search sub-step 96 for every subsequent initial time interval 74 calculates an auxiliary parameter set (see equation [1]) and an activation sequence 58 searched.

The search step 90 has a partial addition step 98 on. In the adding sub-step 98 will be the activation sequence found 58 as a new column for the auxiliary parameter set matrix Δ added.

The search step 90 has a test step 100 on. In the test step 100 output heating powers are calculated using the calculated auxiliary parameter set 48 with through the activation sequence 58 output heating power provided 48 compared. In the event that in the test step 100 If a match is found, a control scheme becomes available 64 set and the search step 90 completed.

In the event that in the test step 100 if a discrepancy is found, it becomes an introduction 102 a new initial time interval 74 initiated and the search sub-step 96 , the adding step 98 and the test part step 100 are repeated until in the test part step 100 a match is found. After determining the agreement in the test part step 100 becomes the test step 100 completed. When the test part step is ended 100 becomes the search step 90 completed.

After completing the search step 90 becomes the application step 108 initiated.

Reference symbol list

10th

Cooking device

12

Control unit

14

Induction target

16

Operating period

18th

Time interval

20th

Performance surplus

22

Performance deficit

24th

Target heating output

26

Flicker characteristic

28

Resonance capacitor unit

30th

Cooking appliance

32

Cooktop

34

Control panel

36

Inductor

38

classic induction hob

40

Induction hob

42

Stand-up plate

44

Cookware

46

Display

48

Output heating power

50

Induction target

52

Total output heating power

54

Total target heating output

56

S matrix

58

Activation sequence

60

Switch element

62

relay

64

Control scheme

66

Induction target

68

Induction target

70

Inverter unit

72

Induction target

74

Initial time interval

76

Initial operating period

80

Determination step

82

Cooking zone

84

Inverter unit

86

Total average heating power

88

Inverter unit

90

Search step

92

Frequency sweep substep

94

Frequency search sub-step

96

Search sub-step

98

Add step

100

Test part step

102

introduction

104

Initial heating mode

106

Continuous heating mode

108

Application step

110

Sub-selection step

114

Repetition

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• EP 1951003 B1 [0003]
• US 7910865 B2 [0004]

Non-patent literature cited

• DIN EN 61000-3-3 standard [0008, 0039, 0094]

Claims (15)

Cooking appliance device (10), in particular hob device, with a control unit (12) which, in a periodic continuous heating operating state (106), for repetitive activation and energy supply of at least one first induction target (14) and at least one second induction target (50) with an operating period (16) is provided, characterized in that the control unit (12) is provided in an initial heating operating state (104) with an initial operating period (76) to determine at least one operating parameter set for the permanent heating operating state (106) and the induction targets (14, 50) at least when fulfilled to convert a tolerance condition into the continuous heating operating state (106) and to operate it in consideration of the operating parameter set in the continuous heating operating state (106). Cooking appliance device (10) after Claim 1 , characterized in that the tolerance condition corresponds to a match of a total average heating power (86) of the induction targets (14, 50) with respect to the entire initial operating period (76) with a total target heating power (54) within a deviation interval of at most 10% of the total target heating power (54). Cooking appliance device (10) after Claim 1 or 2nd , characterized in that the operating parameter set has at least one unit heating frequency, which is a highest heating frequency at which the induction targets (14, 50) provide the highest total output heating power (52) in the case of a common heating operation. Cooking appliance device (10) after Claim 3 , characterized in that the control unit (12) is provided to operate the induction targets (14, 50) with the standard heating frequency in at least a first initial time interval (74) of the initial heating operating state (104). Cooking appliance device (10) according to one of the preceding claims, characterized in that the control unit (12) is provided for determining at least one auxiliary parameter set for determining at least one operating parameter set of at least one initial time interval (74) of the initial heating operating state (104). Cooking appliance device (10) after Claim 5 , characterized in that the control unit (12) is provided to determine the auxiliary parameter set from auxiliary parameter sets of all previous initial time intervals (74) at least for an initial time interval (74) different from a first initial time interval (74). Cooking appliance device (10) after Claim 5 or 6 , characterized in that the control unit (12) is provided to determine at least one operating parameter set for the initial time interval (74) from the auxiliary parameter set and to check this for feasibility. Cooking appliance device (10) after Claim 7 , characterized in that the control unit (12) is provided to change the lengths of initial time intervals (74) if the operating parameter set is not executable and in particular to check the executability of the new operating parameter set. Cooking appliance device (10) after Claim 7 or 8th , characterized in that the control unit (12) is provided to change the output heating powers (48) of the induction targets (14, 50) in the initial time interval (74) if they are not feasible in the operating parameter set and to optimize them in the initial time interval (74) Operate total output heating power (52), the control unit (12) being provided to minimize a deviation of the optimized total output heating power (52) from the total target heating power (54) in the initial time interval (74), with all induction targets (14, 50) in the Initial time interval (74) deliver an output heating power (48) greater than 0. Cooking appliance device (10) according to one of the Claims 7 to 9 , characterized in that the control unit (12) is provided for introducing an additional initial time interval (74) if the operating parameter set cannot be carried out and, in particular, for determining an additional auxiliary parameter set for the additional initial time interval (74). Cooking appliance device (10) according to one of the preceding claims, characterized in that the control unit (12) is provided for all induction targets (14, 50) in the continuous heating operating state (106) in at least one time interval (18) of the operating period (16) together with the Operate unit heating frequency. Cooking appliance device (10) according to one of the preceding claims, characterized in that the control unit (12) is provided to permit flicker in a controlled manner when driving the induction targets (14, 50) and to keep at least one flicker parameter (26) within at least one admissibility interval . Cooking appliance device (10) according to one of the preceding claims, characterized in that the control unit (12) is provided for at least one dependency for each induction target (14, 50) before the initial heating operating state (104) to determine an output heating power (48) from a heating frequency. Cooking appliance (30), in particular hob (32), with at least one cooking appliance device (10) according to one of the preceding claims. Method for operating a cooking device (10), in particular a cooktop device, in particular according to one of the Claims 1 to 13 , in which at least a first induction target (14) and at least a second induction target (50) in a periodic continuous heating operating state (106) with an operating period (16) are controlled repetitively and supplied with electrical energy, characterized in that in an initial heating operating state (104) at least one operating parameter is determined and the induction targets (14, 50) are converted to the continuous heating operating state (106) when at least one tolerance condition is met and are operated taking into account the operating parameter.

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