ES2992837T3 - Cooking device - Google Patents

Abstract

The invention is based on a kitchen appliance (10), in particular a countertop appliance, with a control unit (12) which is provided in a periodically continuous heating operating state for the repetitive control and energy supply of at least one first induction target (14) and at least one second induction target (50) with an operating period (16). In order to improve the control properties, it is proposed that the control unit (12) is provided to operate each induction target (14, 50) in at least one time interval (18) of the operating period (16) with a power surplus (20) and in at least one further time interval (18) of the operating period (16) with a power deficit (22) compared to the heating power of the respective target (24). (Automatic translation with Google Translate, without legal value)

Description

DESCRIPTION

Cooking appliance device

The present invention relates to a cooking appliance device according to the preamble of claim 1 and to a method for putting a cooking appliance device into operation according to the preamble of claim 11.

From the prior art, cooking appliance devices and in particular cooking zones are already known which have inductors which are operated with heating frequencies matched to each other in order to avoid acoustically perceptible coupling noises, where the control schemes for controlling the inductors for heating cooking batteries are determined in a complex determination and calculation process as a result of increased customer demands with regard to the control quality and functionality of a cooking zone, which places high demands on production and the installed components and therefore results in high costs.

In this context, EP 1951 003 B1 and EP 2911 472 A2 [BSH HAUSGERÁTE GMBH (DE)] of 26 August 2015 (26-08-2015) disclose a method for simultaneous inductive operation of two inductors of an induction hob to avoid the generation of coupling noise and a non-uniform current load on the mains, the method wherein the inductors are operated together at a first time interval with a first heating frequency and at a second time interval with a second heating frequency that is different from the first heating frequency.

Likewise, specification US 7,910,865 B2 discloses a method for operating an induction cooking field in which the inductors are operated during one operating mode with a common heating frequency and, during another operating mode, with different heating frequencies in each case, where the heating frequencies have a frequency separation of between 15 kHz and 25 kHz.

The object of the present invention is in particular to provide a generic cooking appliance device with improved activation properties. According to the invention, this object is achieved by the features of claims 1 and 11, while advantageous embodiments and improvements of the invention can be derived from the dependent claims.

The invention relates to a cooking appliance device, in particular a cooking area device and preferably an induction cooking area device, with a control unit which in at least one operating state of periodic continuous heating is provided for repetitive activation and energy supply of at least one first induction target and at least one second induction target with an operating period.

It is proposed that the control unit be provided to operate each of the induction targets in at least one time interval of the operating period with an excess of power and in at least one further time interval of the operating period with a power deficit with respect to the corresponding theoretical heating power.

By means of the embodiment according to the invention, a generic cooking appliance device with improved properties in terms of particularly simplified activation and, in particular, in terms of quiet operation can be provided. Thanks to simplified activation, in particular the complexity of determining executable control schemes can be significantly reduced. In this way, it is possible to use in particular inexpensive and/or less efficient components. An increasing complexity with the number of induction targets for controlling a target heating power desired by a user can be advantageously reduced. In particular, simple power control can be made possible. In this way, in particular a disadvantageous acoustic burden on the user can be avoided, whereby it is possible to achieve in particular high user comfort and in particular a positive operating impression on the user in particular regarding acoustic quality. Preferably, flickering can be avoided at least to a large extent by means of advantageous control of the individual induction targets in accordance with a flicker standard, in particular in accordance with DIN EN 61000-3-3. In particular, a safe implementation is possible, preferably with regard to a target heating power requested by the user. In particular, it is possible to simultaneously operate several induction targets together, advantageously silently and with a load from a power supply with controlled flickering.

The term “cooking appliance device”, advantageously “cooking range device” and particularly advantageously “induction cooking range device” is in particular to be understood as meaning at least one part, in particular a sub-assembly, of a cooking appliance, in particular a cooking oven, for example an induction cooking oven and advantageously a cooking range and particularly advantageously an induction cooking range. Advantageously, the household appliance having the cooking appliance device is a cooking appliance. A household appliance designed as a cooking appliance could be, for example, a cooking oven and/or a microwave oven and/or a grill appliance and/or a steam cooker. Advantageously, a household appliance designed as a cooking appliance is a cooking range and preferably an induction cooking range.

The term "energy supply" is in particular understood to mean a supply of electrical energy in the form of an electrical voltage, an electrical current and/or an electric and/or electromagnetic field from at least one energy source. The term "energy source" is in particular understood to mean a unit which supplies electrical energy in the form of an electrical voltage, an electrical current and/or an electric and/or electromagnetic field to at least one further unit and/or to at least one electrical current circuit. The energy source can in particular be an electrical current phase of a power supply network. The energy source can in particular supply a maximum power of 3.7 kW. Advantageously, an inverter unit can 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 may have at least one, in particular at least two, or also more inverter(s), to provide a high-frequency supply voltage with a heating frequency suitable for induction purposes.

The term "control unit" is in particular to be understood as an electronic unit which is preferably at least partially integrated into a control and/or regulating unit of a cooking appliance device, in particular a hob device, advantageously an induction hob device, and which is in particular provided for controlling and/or regulating at least one inverter unit of the cooking appliance device with at least one inverter, in particular a resonant inverter and/or a double half-bridge inverter. The control unit in particular evaluates a signal supplied by a unit, in particular a sensor and/or detection unit, after which the control unit can initiate a particular process and/or operating state, in particular if at least one condition is met. Preferably, the control unit 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.

The cooking appliance device may in particular have a connection unit. The connection unit is in particular controlled by the control unit, where the connection unit in particular establishes an electrical connection between at least one energy source and at least one energy consumer, for example one of the induction targets. The connection unit may in particular have at least one electromechanical or semiconductor-based connection element and be intended to establish at least one electrical connection between at least the energy source and at least the induction target. "Connection element" is in particular to be understood as an element which is intended to establish and/or separate an electrically conductive connection between two points, in particular contacts of the connection element. Preferably, the connection element has at least one control contact via which it can be connected. The connection element is in particular designed as a semiconductor connection element, in particular as a transistor, for example as a metal-oxide semiconductor field-effect transistor (MOSFET), advantageously as a bipolar transistor with preferably insulated gate electrode (IGBT). Alternatively, the connecting element is designed as a mechanical and/or electromechanical connecting element, in particular as a relay.

In particular, the term "induction target" is to be understood as meaning an inductor or a plurality of inductors which is/are specifically part of the cooking appliance device, with a cooking battery supported on the inductor and/or the plurality of inductors, where the inductor or the plurality of inductors are specifically provided together in at least one specifically specific operating state, in particular in at least one continuous heating operating state, for inductively heating the cooking battery supported on the inductor or the plurality of inductors. In this respect, the inductors of the induction target can in each case provide the same heating power compared to each other in at least the continuous heating operating state. Advantageously, the control unit activates the inductors of an induction target with the same heating frequency. Furthermore, in particular a particular inductor of the induction target can supply a temporarily different heating power during at least the continuous heating operating state. The control unit is particularly provided to define at least one induction target. In particular, the control unit can define a plurality of induction targets. The cooking appliance device has in particular at least one inductor, in particular a plurality of inductors. In particular, an "inductor" is to be understood here as an element which, in at least one continuous heating operating state, supplies at least one cooking battery with energy for the purpose of heating the cooking battery, in particular in the form of an alternating magnetic field which is intended to cause eddy currents and/or magnetic reversal effects in a metallic, preferably at least partially ferromagnetic heating medium, in particular a cooking battery, which are converted into heat. The inductor has in particular at least one induction coil and is in particular intended to supply the cooking battery with energy in the form of an alternating magnetic field with a heating frequency. The inductor is arranged in particular below and advantageously in an area close to at least one support plate of the cooking appliance device. In particular, the plurality of inductors can be arranged in a matrix-like manner, with the inductors arranged in a matrix-like manner being able to form a variable cooking surface. In particular, the inductors can be combined with one another in induction cooktops of any size, in particular with different contours. Alternatively, the inductors can also be arranged in the form of a conventional cooking surface, in particular with two, three, four or five heating zones.

The term "continuous heating operating state" is in particular to be understood as meaning an operating state in which a specific activation of a unit, in particular of at least two induction targets, takes place and/or in which a specific method and/or a specific algorithm is applied to the unit, in particular to the induction targets, where in particular the control unit actuates the induction targets in a manner adapted to one another. In particular, the continuous heating operating state has a duration, in particular uninterrupted in time, of at least 1 s, preferably of at least 10 s, advantageously of at least 60 s and particularly preferably of at least 300 s, where electrical energy in the form of output heating power in particular is supplied to at least one induction target, which is advantageously not equal to 0 and whose time average in particular corresponds to a target heating power. In a continuous heating operating state, in particular, a temperature increase of a cooking battery of the induction target and/or a temperature increase and/or an at least partial phase transition of a cooking product arranged in the cooking battery takes place. In particular, the temperature increase of the cooking battery and/or the cooking product is in particular 0.5 ° C, advantageously 1 ° C, preferably 5 ° C and particularly advantageously more than 10 ° C. The weight percentage of the cooking product undergoing a phase transition is in particular 1%, advantageously 5%, preferably 10% and particularly advantageously more than 20%.

In the continuous heating operating state, the control unit adjusts in particular at least one output heating power of at least the first and/or second induction target, advantageously at least a large part of the output heating powers of the first and/or second induction target and preferably all output heating powers of the first and/or second induction target by means of a heating frequency and/or by means of trigger signals that are phase-shifted relative to one another and/or by means of a duty cycle. The term “output heating power” of the first and/or second induction target is in particular to mean an electrical power that inductors of the first and/or second induction target provide in at least one continuous heating operating state to a cooking battery of the first and/or second induction target for heating within a time interval.

In particular, the term “repetitive activation” of a device is understood to mean an activation of the device, in particular with an electrical signal, which is repeated periodically in at least one continuous heating operating state. In particular, the term “average electrical power” is understood to mean an electrical power supplied, in particular, to the induction target, on average, in particular over a period of time, in particular over an operating period. Preferably, the average electrical power corresponds to a set target heating power set by the user. In particular, the term “operating period” is understood to mean 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, in which electrical energy is supplied to the induction target, in which case the electrical energy can tend to zero. Preferably, the operating period is divided into at least two time intervals during which, in particular, the induction target is supplied with a corresponding constant electrical energy. "Time interval" is in particular to be understood as a time period whose duration is greater than 0 s and less than the operating period, where a duration of all time intervals of the operating period corresponds exactly to a duration of the operating period. In particular, individual time intervals may have a different duration from one another.

The term "excess power" of an induction target is in particular understood to mean a power whose average value over a 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 other than a target frequency, whereby, during operation of the induction target at the target frequency, a theoretical heating power required and/or set by the user is provided. In particular, the excess power is achievable during operation of the cooking field device in a ZVS mode with a heating frequency that is lower than the target frequency. In particular, the excess power is achievable during operation of the cooking field device in a ZCS mode with a heating frequency that is higher than the target frequency. In particular, "ZVS mode" is to be understood to mean a zero-voltage switching mode in which a voltage with a value of approximately zero is present during a switching process of a switching element. In particular, the term "ZCS mode" is used to mean a zero-current switching mode in which a current with a value of approximately zero is present during a switching process of a switching element. In particular, the control unit selects the heating frequencies such that they do not generate intermodulation interference signals that are acoustically perceptible to a person with an average ear. In particular, the intermodulation interference signals are generated by coupling at least two heating frequencies that have a frequency separation of less than 17 kHz relative to each other.

In order to avoid intermodulation interference, the control unit may select an activation sequence from a catalogue of activation sequences for an activation scheme for activating the induction targets in particular in the continuous heating operating state. For example, the control unit could operate the induction targets with an essentially identical heating frequency in the continuous heating operating state to avoid intermodulation interference. Alternatively or additionally, the control unit could operate the induction targets in each case with heating frequencies that differ from one another by at least 17 kHz in the continuous heating operating state to avoid intermodulation interference. Alternatively or additionally, the control unit could, for example, deactivate at least one induction target and operate at least one other induction target, separate from the induction target, with a determined heating frequency in the continuous heating operating state to avoid intermodulation interference. Alternatively or additionally, the control unit could actuate the induction targets with activation signals of equal heating frequency out of phase with respect to each other in the continuous heating operating state to avoid intermodulation spurious signals.

The term "power deficit" is in particular to be understood as meaning a power whose average value over a time interval is 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 other than a target frequency, whereby, during operation of the induction target with the target frequency, a power required and/or set by the user is provided. In particular, the power deficit is achievable during operation of the cooking appliance device in a ZVS mode with a heating frequency which is higher than the target frequency. In particular, the power deficit is achievable during operation of the cooking appliance device in a ZCS mode with a heating frequency which is lower than the target frequency.

The term "intended" is in particular intended to mean specifically programmed, designed and/or provided. The fact that an object is intended for a specific function is in particular to mean that the object satisfies and/or performs this specific function in at least one application and/or operating state and/or continuous heating operating state.

It is also proposed that the control unit be provided to actuate each of the induction targets in exactly one time interval of the operating period with an excess of power and in exactly another time interval of the operating period with a power deficit with respect to the respective target heating power. In this way, in particular, a physically plausible activation scheme can be created, in which it can be ensured in particular that the calculated durations of the time intervals always have positive values. In particular, the excess of power and the power deficit have quantitatively the same value. Advantageously, the temporal order of the time interval with the excess of power and the other time interval with the power deficit of an induction target can be as desired. In particular, a time interval can have any number of excess powers and/or power deficits, whereby the number of excess powers and/or power deficits can correspond in particular to at most one number of induction targets.

Furthermore, it is proposed that the control unit is provided to actuate the induction targets in the remaining time intervals of the operating period, which are different with respect to the time interval and the other time interval, with the corresponding target heating power. In particular, a number of remaining time intervals amounts to a value greater than or equal to 1. In particular, a number of induction targets that the control unit actuates with the corresponding target heating power can be the desired number, in particular at most equal to the number of induction targets, in one of the remaining time intervals. In this way, an advantageous activation of the induction targets can be implemented.

Furthermore, it is proposed that a number of time intervals of the operating period be greater than a number of induction targets. In this way, a safe selection process of the activation sequences of the activation scheme can be implemented in particular to direct the heating powers of the induction targets.

Preferably, the number of time intervals is greater than the number of induction targets by exactly 1. In this way, the time duration of the selection process of the activation sequences can be minimised in particular. In this way, a safe and/or physically plausible adaptation of the time intervals can be advantageously made possible. In the continuous heating operating state, a minimum number of time intervals is in particular equal to 3. In the continuous heating operating state, a minimum number of induction targets is in particular equal to 2.

Furthermore, it is proposed that the control unit be provided to allow flickering in a controlled manner during the activation of the induction targets and to maintain at least one flickering parameter within at least one permissible range. The flickering parameter reflects in particular a relationship between a change in the total output heating power in a time interval relative to a previous time interval and a duration of the time interval. Advantageously, the permissible range amounts to a maximum value of 400 Ws-1. In this way, a simplification of the selection process of the activation sequences for the activation of the induction targets can be achieved. In addition, a controlled loading of a supply voltage network can be made possible. “Flickering” is in particular to be understood as a subjective impression of instability of a visual perception that is caused in particular by a light stimulus whose luminance or spectral distribution fluctuates over time. Flickering can in particular be caused by a voltage drop in a network voltage.

In particular, a total output heating power of the induction targets falls below a total theoretical output heating power of the induction targets in at least one time interval. In particular, the total output heating power of the induction targets exceeds the total theoretical output heating power of the induction targets in at least one time interval. In a continuous heating operating state, in particular, the "total output heating power" is understood to mean a sum of the output heating powers of all induction targets in a time interval. In particular, the "output heating power" of one of the induction targets is understood to mean an electrical power that the induction target consumes in at least one continuous heating operating state with at least one cooking battery supported for heating the cooking battery. The output heating power could be characterized, for example, by at least one electrical current. In at least one continuous heating operating state, the induction target could, for example, at least partially, advantageously at least largely and preferably completely, convert the output heating power into a heat stream in at least one conductive element of at least one inductor of the induction target and provide the heat stream in particular for heating at least one cooking battery. Alternatively or additionally, the inductor could provide, in particular by means of the electric current, a particularly high-frequency alternating electromagnetic field, which could be converted into heat in particular in one cooking battery, in particular in at least one continuous heating operating state. The term “total theoretical output heating power” is understood to mean a sum of the theoretical heating powers of all induction targets. The total theoretical output heating power has in particular a constant value over the entire operating period at all time intervals.

Advantageously, the control unit controls the induction targets in such a way that a total average heating output power at least substantially corresponds to a total set heating power. “Total average heating output power” is in particular to be understood as a total heating output power averaged over the operating period. In this context, “at least substantially” is to be understood in particular as meaning that a deviation from a predetermined value is in particular less than 25%, preferably less than 10% and particularly preferably less than 5% of the predetermined value. In this way, in particular, at least substantially a heating output set by the user can be supplied and thus in particular user satisfaction can be promoted.

It is also proposed that the cooking appliance device has a resonant capacitor unit which is connected to both induction targets in at least one special continuous heating operating state. When the induction targets are connected to a common resonant capacitor unit, in particular to a common capacitor of the resonant capacitor unit, an electrical coupling is created in particular, which advantageously makes it possible to control the induction targets for controlling the output heating powers with control signals that are phase-shifted from one another. In this way, an economical construction can be implemented. In particular, the control unit can control both induction targets with the same heating frequency.

Furthermore, it is proposed that the control unit be provided to actuate the induction targets in the special continuous heating operating state with trigger signals that are phase shifted relative to each other. In this way, an additional possibility of triggering the induction targets without intermodulation interference signals can be created in particular. The phase shift of the trigger signals can in particular be between -180° and 180°. Advantageously, the trigger signal is present as an electrical voltage and/or electrical current.

It is also proposed that the activation signals have the same heating frequency. In this way, an advantageous control of the heating frequencies can be achieved.

Furthermore, a cooking appliance, in particular a cooking hob, is proposed with at least one cooking appliance device according to the invention, by which in particular a low-interference operation and, advantageously, a simplified selection process of the activation sequences for the activation of the induction targets can be produced.

The invention also relates to a method for operating a cooking appliance device, in particular a cooking range device, during which at least one first induction target and at least one second induction target are activated and supplied with energy repetitively with an operating period in at least one periodic continuous heating operating state.

It is proposed that each of the induction targets is actuated in at least one time interval of the operating period with an excess of power and in at least one other time interval of the operating period with a power deficit with respect to the corresponding theoretical heating power.

In this way, a particularly simplified control and in particular a quiet operation can be made possible. Thanks to a simplified control, in particular the complexity of determining executable control schemes can be significantly reduced. In this way, it is possible to use in particular inexpensive and/or less efficient components. An increasing complexity with the number of induction targets for the control of a theoretical heating power desired by a user can be advantageously reduced. In particular, a simple power control can be made possible. In this way, in particular a disadvantageous acoustic load can be avoided for a user, so that in particular a high level of user comfort and in particular a positive operating impression for the user in particular regarding acoustic quality can be achieved. Preferably, flickering can be avoided at least to a large extent by means of advantageous control of the individual induction targets in accordance with a flicker standard, in particular in accordance with DIN e N 61000-3 3. In particular, a safe implementation can be achieved, preferably with regard to a theoretical heating power requested by the user. In particular, it is possible to simultaneously operate several induction targets together, advantageously silently and with a load from a power supply with controlled flickering.

Furthermore, it is proposed that each induction target is actuated in exactly one time interval of the operating period with an excess of power and in exactly another time interval of the operating period with a power deficit with respect to the respective theoretical heating power. In this way, a physically plausible activation scheme can be created in particular, where in particular a corresponding duration of the time intervals is positive.

It is also proposed that the induction targets be operated at the respective target heating power in the remaining time intervals of the operating period, which differ from the time interval and the other time interval. This enables advantageous activation of the induction targets. In addition, power losses, which can lead to thermal losses and thus a deterioration of the cooking process, can be minimised in this way.

The cooking appliance device is not limited here to the application or embodiment described above, and may in particular have a quantity of particular elements, components and units that differs from the quantity mentioned herein, for the fulfillment of a functionality described herein.

Further advantages are apparent from the following description of the drawing. Illustrative embodiments of the invention are shown in the drawing. The drawing, the description and the claims contain numerous features in combination. The person skilled in the art will advantageously consider the features separately as well, and combine them in other reasonable combinations.

They show:

Figure 1 shows a cooking area with a cooking appliance device,

Figure 2 shows an exemplary embodiment of the cooking appliance device in a first embodiment with two induction targets defined by a control unit of the cooking appliance device,

Figure 3 shows an exemplary representation of an activation scheme for two induction targets,

Figure 4 shows an exemplary representation of an activation scheme for three induction targets,

Figure 5 shows another exemplary embodiment of the cooking appliance device in a cost-effective embodiment with four induction targets defined by a control unit of the cooking appliance device,

Figure 6 shows a simplified circuit diagram of a part of the other exemplary embodiment of the cooking appliance device in the cost-effective embodiment with two induction targets,

Figure 7 shows an exemplary representation of an activation scheme for two induction targets in the cost-effective embodiment of the cooking appliance device, Figure 8 shows an exemplary representation of another activation scheme for two induction targets in the cost-effective embodiment of the cooking appliance device, and

Figure 9 is a procedural diagram of a procedure for commissioning the cooking appliance device.

Figure 1 shows a cooking appliance 30 designed as a cooking surface 32. The cooking appliance 30 is designed as an induction cooking surface 40. The cooking appliance 30 is designed as a classic induction cooking surface 38 with four cooking zones 82. It is conceivable that the cooking appliance 30 is designed as a matrix cooking surface.

Two of the four cooking zones 82 are each covered by a cooking battery 44. The cooking appliance 30 has a cooking appliance device 10. The cooking appliance device 10 is designed as an induction cooking surface device.

Only one of each of the objects present several times is accompanied by a reference symbol in the figures.

The cooking appliance device 10 has a support plate 42 for at least one cooking battery 44. The support plate 42 is provided to support cooking battery 44. In the present exemplary embodiment, the support plate 42 is designed as a cooking field plate.

The cooking appliance device 10 has a plurality of inductors 36. An inductor 36 is associated with exactly one cooking zone 82. It is conceivable that the inductors 36 are arranged in a matrix-like manner in the case of a matrix cooking surface. The inductors 36 are each arranged below the respective cooking zone 82. Each inductor 36 has at least one induction coil. In the present exemplary embodiment, the cooking appliance device 10 has four inductors 36.

In an installed state, the inductors 36 are arranged below the support plate 42. The inductors 36 are each provided for heating a cooking battery 44 resting on the support plate 42 above the inductors 36 in a continuous heating operating state.

The cooking appliance device 10 has an operating panel 34 for entering and/or selecting operating parameters by a user, for example a set heating power 24 and/or a cooking time. The operating panel 34 is designed as a display 46. The operating panel 34 is provided for outputting a value of an operating parameter to the user.

The cooking appliance device 10 has a control unit 12. The control unit 12 is intended to execute actions and/or algorithms and/or modify settings depending on operating parameters entered by a user, such as, for example, a target heating power 24 and/or a cooking time.

The control unit 12 defines the induction targets 14, 50 on the basis of the cooking batteries 44 supported on the support plate 42. In the present example, two induction targets 14, 50 are defined by the control unit 12 on the basis of the cooking batteries 44 supported on the support plate 42 and on the inductors 36 on which the cooking batteries 44 are placed. An induction target 14, 50 has exactly one inductor 36. Alternatively, an induction target 14, 50 can have several inductors 36. An induction target 14, 50 has at least one cooking battery 44. The control unit 12 can define a plurality of induction targets 14, 50.

An output heating power 48 of each induction target 14, 50 depends decisively on the heating frequency applied to the induction target 14, 50. In a ZVS mode, the output heating power 48 of an induction target 14, 50 increases with decreasing heating frequency. In a ZCS mode, the output heating power 48 of an induction target 14, 50 decreases with increasing heating frequency. Preferably, the control unit 12 operates the cooking appliance device 10 in the ZVS mode.

In the continuous heating operating state, an energy source supplies electrical energy to the induction targets 14, 50. The energy source is an electrical current phase of a power supply network. The cooking appliance device 10a may have at least one inverter unit 70a for providing at least one heating frequency for the respective induction target 14a, 50a (see FIG. 2).

In the continuous heating operating state, the control unit 12 is provided for repetitive activation and power supply of the first induction target 14 and the second induction target 14 from the energy source. The control unit 12 is provided in the continuous heating operating state for periodic activation and power supply of the induction targets 14, 50.

2 shows an exemplary embodiment of the cooking appliance device 10a in a first embodiment with two induction targets 14a, 50a defined by a control unit 12a of the cooking appliance device 10a. The control unit 12a defines a first and a second induction target 14a, 50a. The cooking appliance device 10a has a first and a second resonant inverter unit 70a, 84a. The inverter units 70a, 84a provide a heating frequency for the induction targets 14a, 50a. The inverter units 70a, 84a supply electrical energy to the induction targets 14a, 50a independently of each other. The first inverter unit 70a is associated with the first induction target 14a. The second inverter unit 84a is associated with the second induction target 50a.

The cooking appliance device 10a has an electromechanical switching element 60a for each induction target 14a, 50a. The switching element 60a is designed as a relay 62a. The induction targets 14a, 50a can be connected to the electrical power supply via the relays 62a. For each induction target 14a, 50a, the cooking appliance device 10a has a resonant capacitor unit 28a. Each induction target 14a, 50a can be activated separately with a corresponding heating frequency.

In the continuous heating operating state, the control unit 12a drives the induction targets 14a, 50a in a manner that avoids intermodulation interference signals (see Fig. 3). In the continuous heating operating state, the control unit 12a adjusts the output powers of the induction targets 14a, 50a via a corresponding heating frequency.

In order to avoid intermodulation interference, the control unit 12a selects an activation sequence from a catalogue of activation sequences in the continuous heating operating state. For example, the control unit 12a could operate the first induction target 14a and/or the second induction target 50a at least substantially with the same heating frequency in the continuous heating operating state in order to avoid intermodulation interference.

Alternatively or additionally, the control unit 12a could operate the first induction target 14a and/or the second induction target 50a in the continuous heating operating state with heating frequencies that differ by at least 17 kHz in order to avoid intermodulation parasitic signals.

Alternatively or additionally, in order to avoid intermodulation spurious signals, the control unit 12a could, for example, deactivate at least one of the induction targets 14a, 50a and operate at least one of the induction targets 14a, 50a with a determined heating frequency in the continuous heating operating state.

In the continuous heating operating state, the control unit 12a periodically actuates the induction targets 14a, 50a in each case for a complete cooking time. The cooking time is divided into operating periods 16a.

The operating period 16a has three time intervals 18a t<1>, t2, t3 (see Figure 3).

In the continuous heating operating state, the control unit 12a operates the first induction target 14a in a first time interval 18a ti of the operating period 16a with an excess power 20a with respect to the theoretical heating power 24a of the first induction target 14a.

In the continuous heating operating state, the control unit 12a operates the first induction target 14a in a second time interval t218a of the operating period 16a with a power deficit 22a with respect to the theoretical heating power 24a of the first induction target 14a.

In the continuous heating operating state, the control unit 12a operates the first induction target 14a in a third time interval 18a t3 of the operating period 16a with the theoretical heating power 24a of the first induction target 14a.

The control unit 12a actuates the first induction target 14a in exactly a time interval 18a with an excess of power 20a. The control unit 12a actuates the first induction target 14a in exactly a time interval 18a with a power deficit 22a.

In the continuous heating operating state, the control unit 12a operates the second induction target 50a in a first time interval 18a t<1> of the operating period 16a with the theoretical heating power 24a of the second induction target 50a.

The control unit 12a actuates the second induction target 50a in a second time interval 18a t<2> of the operating period 16a with an excess power 20a with respect to the theoretical heating power 24a of the second induction target 50a.

The control unit 12a actuates the second induction target 50a in the third time interval 18a t3 of the operating period 16a with a power deficit 22a with respect to the theoretical heating power 24a of the second induction target 50a.

The control unit 12a actuates the second induction target 50a in exactly a time interval 18a with an excess of power 20a. The control unit 12a actuates the second induction target 50a in exactly a time interval 18a with a power deficit 22a.

The activation scheme 64a for two induction targets 14a, 50a shown in Fig. 3 has an operating period 16a with three time intervals 18a t<1>, t2, t3. The control unit 12a actuates two induction targets 14a, 50a in three time intervals 18a t<1>, t2, t3. A number of time intervals 18a is greater than a number of induction targets 14a, 50a by exactly 1.

The corresponding deviations of the output heating powers 48a of the induction targets 14a, 50a at particular time intervals 18a from the theoretical heating powers 24a are shown in the form of a matrix S 56a. The matrix S 56a contains “+” and “-” signs. The plus sign “+” represents an excess of power 20a. The minus sign “-” represents a power deficit 22a. The output heating powers 48a corresponding to the respective theoretical heating powers 24a are shown as zeros. The matrix S 56a reflects the activation scheme 64a shown in Fig. 3.

When the induction targets 14a, 50a are activated, the control unit 12a allows the flashing in a controlled manner. In the first time interval 18a t<1>, a total output heating power 52a of the induction targets 14a, 50a is above a total theoretical output heating power 54a. The total theoretical output heating power 54a is the sum of the theoretical heating powers of the induction targets 14a, 50a. In the second time interval 18a t2, the total output heating power 52a of the induction targets 14a, 50a corresponds to the total theoretical output heating power 54a. In the third time interval 18a t3, the total output heating power 52a of the induction targets 14a, 50a is below the theoretical total output heating power 54a.

An AP difference indicates the largest difference between the total output heating powers 52a of temporally adjacent time intervals 18a in a constant continuous heating operating state. The largest difference occurs between the total output heating power 52a in the first time interval 18a t<1> and the total output heating power 52a in the last time interval 18a t3, since the activation scheme 64a is repeated in the constant continuous heating operating state, whereby the first time interval 18a t<1> follows the last time interval 18a t3 in the next operating period.

The difference AP in relation to a duration of the operating period 16a determines a flicker parameter 26a. The control unit 12a keeps the flicker parameter 26a within a permissible range. The permissible range is regulated in accordance with a flicker standard, in particular in accordance with DIN EN 61000-3-3.

An exemplary representation of an activation scheme 64a for three induction targets 14a, 50a, 66a is shown in Figure 4. The following description is essentially limited to the differences between the representations of the activation schemes 64a, where, with regard to features and functions that remain the same, reference may be made to the description in Figure 3.

The operating period 16a has four time intervals 18a ti, t<2>, t3, t4.

The control unit 12a operates the first induction target 14a in a first time interval 18a t<1> with an excess power 20a. The control unit 12a operates the first induction target 14a in a second time interval 18a t2 with a power deficit 22a. In a third and fourth time interval 18a t3, t4, the control unit 12a operates the first induction target 14a in each case with a target heating power 24a.

In a first and fourth time interval 18a t<1>, t4, the control unit 12a operates the second induction target 50a in each case with a target heating output 24a. The control unit 12a operates the second induction target 50a in a second time interval 18a t<2> with an excess output 20a. The control unit 12a operates the second induction target 50a in a third time interval 18a t3 with a power deficit 22a.

In a first and second time interval 18a t<1>, t2, the control unit 12a operates the third induction target 66a in each case with a target heating output 24a. The control unit 12a operates the third induction target 66a in a third time interval 18a t3 with an excess output 20a. The control unit 12a operates the third induction target 66a in a fourth time interval 18a t4 with a power deficit 22a.

The corresponding activation sequences 58a are shown in the form of an S-matrix 56a. The S-matrix 56a has in each row exactly 20a excess power and exactly 22a deficit power. A number of columns of the S-matrix 56a is greater by 1 than a number of rows of the S-matrix 56a. The number of columns of the S-matrix 56a represents a number of time intervals 18a. The number of rows of the S-matrix 56a represents a number of induction targets 14a, 50a, 66a.

When the induction targets 14a, 50a, 66a are activated, the control unit 12a allows the flashing in a controlled manner. In the first time interval 18a t<1> a total output heating power 52a of the induction targets 14a, 50a, 66a is above a total theoretical output heating power 54a. The total theoretical output heating power 54a is the sum of the theoretical heating powers 24a of the induction targets 14a, 50a, 66a. In the second time interval 18a t<2>, the total output heating power 52a of the induction targets 14a, 50a, 66a corresponds to the total theoretical output heating power 54a. In the third and fourth time interval 18a t3,t4 the total output heating power 52a of the induction targets 14a, 50a, 66a is below the theoretical total output heating power 54a.

A difference AP indicates the largest difference between the total output heating powers 52a of adjacent time intervals 18a in a constant continuous heating operating state. The largest difference occurs between the total output heating power 52a in the last time interval 18a t4 and the total output heating power 52a in the first time interval 18a ti, since the activation scheme 64a is repeated in the constant continuous heating operating state, whereby the first time interval 18a t<1> follows the last time interval 18a t4. The control unit 12a keeps the flicker parameter 26a within a permissible range. The permissible range is regulated in accordance with a flicker standard, in particular in accordance with DIN EN 61000-3-3.

Another exemplary embodiment of the invention is shown in Figures 5 and 6. The following descriptions are essentially limited to the differences between the exemplary embodiments, whereby, with regard to components, features and functions that remain the same, reference may be made to the description of the exemplary embodiment in Figure 2. In order to differentiate the exemplary embodiments, the letter "a" in the reference symbols of the exemplary embodiment in Figures 2 to 4 has been replaced by the letter "b" in the reference symbols of the exemplary embodiment in Figures 5 to 8. With regard to components indicated in the same way, in particular with regard to components with the same reference symbols, reference may also be made essentially to the drawings and/or to the description of the exemplary embodiment in Figures 1 to 4.

5 shows a further exemplary embodiment of the cooking appliance device 10b in a cost-effective embodiment with four induction targets 14b, 50b, 66b, 68b defined by a control unit 12b of the cooking appliance device 10b. The cooking appliance device 10b has a control unit 12b. The control unit 12b defines four induction targets 14b, 50b, 66b, 68b. The cooking appliance device 10b has two resonant inverter units 70b, 84b each with a half-bridge 80b. The cooking appliance device 10b has six switching elements 60b. The switching elements 60b are designed as relays 62b. The control unit 12b controls the switching elements 60b in dependence on a number of induction targets 14b, 50b, 66b, 68b. If less than three induction targets 14b, 50b, 66b, 68b are defined, the control unit 12b actuates the induction targets 14b, 50b, 66b, 68b from different resonant inverter units 70b, 84b. If three or more induction targets 14b, 50b, 66b, 68b are defined, the control unit 12b controls the switching elements 60b such that they switch at least one of the two resonant inverter units 70b, 84b between two induction targets 14b, 50b, 66b, 68b. If there are three or more induction targets 14b, 50b, 66b, 68b, at least two induction targets 14b, 50b, 66b, 68b are connected to one of the two resonant inverter units 70b, 84b via the switching elements 60 b. If there are three or more induction targets 14b, 50b, 66b, 68b, at least two induction targets 14b, 50b, 66b, 68b are connected to one of the two resonant capacitor units 28b.

In Fig. 5, four induction targets 14b, 50b, 66b, 68b defined by the control unit 12b are shown. Every two induction targets 14b, 50b, 66b, 68b are connected to one of the resonant inverter units 70b, 84b via the switching elements 60b. Every two induction targets 14b, 50b, 66b, 68b are connected to one of the resonant capacitor units 28b.

Figure 6 shows a simplified circuit diagram of two induction targets 14b, 50b from Figure 5, which are connected to a common resonant capacitor unit 28b. The induction targets 14b, 50b are connected to different resonant inverter units 70b, 84b. To simplify the representation, no switching element 60b is shown in Figure 6.

By connecting to the same resonant capacitor unit 28b, an electrical coupling is generated between the induction targets 14b, 50b. The control unit 12b switches to a special continuous heating operating state. The control unit 12b drives the induction targets 14b, 50b simultaneously. In the special continuous heating operating state, the control unit 12b drives both resonant inverter units 70b, 84b simultaneously.

The control unit 12b controls the output heating powers 48b of the induction targets 14b, 50b by means of phase-shifted trigger signals for the activation of the two induction targets 14b, 50b. A phase shift between the trigger signals can be implemented by the control unit 12b by activating the resonant inverter units 70b, 84b. The phase-shifted trigger signals have the same heating frequency.

Figure 7 shows an exemplary representation of an activation scheme 64b for two induction targets 14b, 50b in the economical embodiment of the cooking appliance device 10b.

During simultaneous operation, the control unit 12b actuates the induction targets 14b, 50b with activation signals of the same heating frequency, phase-shifted from each other.

The operating period 16b has three time intervals 18b t<1>, t2, t3.

The control unit 12b operates the first induction target 14b in a first time interval 18b t<1> with an excess power 20b. The control unit 12b operates the first induction target 14b in a second time interval 18b t<2> with a power deficit 22b. The control unit 12b operates the first induction target 14b in a third time interval 18b t3 with a target heating power 24b.

The control unit 12b operates the second induction target 50b in a first time interval 18b t<1> with a target heating power 24b. The control unit 12b operates the second induction target 50b in a second time interval 18b t<2> with an excess power 20b. The control unit 12b operates the second induction target 50b in a third time interval 18b t3 with a power deficit 22b.

In the special continuous heating operating state, the control unit 12b actuates the first and second induction targets 14b, 50b with trigger signals of the same heating frequency fi in the first time interval 18b t<1>. The trigger signals have a phase shift relative to each other ^<1>.

In the special continuous heating operating state, the control unit 12b actuates the first and second induction targets 14b, 50b with trigger signals of the same heating frequency f<2> in the second time interval 18b t<2>. The trigger signals have a phase shift relative to each other ^<2>.

The corresponding deviations of the output heating powers 48b of the induction targets 14b, 50b at particular time intervals 18b from the theoretical heating powers 24b are shown in the form of an S-matrix 56b. The S-matrix 56b has exactly one power excess 20b and exactly one power deficit 22b in each row. A number of columns of the S-matrix 56b is greater by 1 than a number of rows of the S-matrix 56b. The number of columns of the S-matrix 56b represents a number of time intervals 18b. The number of rows of the S-matrix 56b represents a number of induction targets 14b, 50b.

When the induction targets 14b, 50b are activated, the control unit 12b allows the flashing in a controlled manner. In the first time interval 18b t<1> a total output heating power 52b of the induction targets 14b, 50b is above a total theoretical output heating power 54b. The total theoretical output heating power 54b is the sum of the theoretical heating powers 24b of the induction targets 14b, 50b. In the second time interval 18b t2, the total output heating power 52b of the induction targets 14b, 50b corresponds to the total theoretical output heating power 54b. In the third time interval 18b t3 the total output heating power 52b of the induction targets 14a, 50b is below the theoretical total output heating power 54b (see Figure 7).

An AP difference indicates the largest difference between the total output heating powers 52b of adjacent time intervals 18b in a constant continuous heating operating state. The largest difference occurs between the total output heating power 52b in the last time interval 18b t3 and the total output heating power 52b in the first time interval 18b t<1>, since the activation scheme 64b is repeated in the constant continuous heating operating state, whereby the first time interval 18b t<1> follows the last time interval 18b t3.

The difference AP in relation to a duration of the operating period 16b determines a flicker parameter 26b. The control unit 12b keeps the flicker parameter 26b within a permissible range. The permissible range is regulated in accordance with a flicker standard, in particular in accordance with DIN EN 61000-3-3.

Figure 8 shows an exemplary representation of another activation scheme 64b for two induction targets 14b, 50b in the economical implementation of the cooking appliance device 10b.

The following description is essentially limited to the differences between the representations of the activation schemes 64b, where, in relation to characteristics and functions that remain the same, reference can be made to the description of the exemplary embodiment of Figure 3.

During simultaneous operation, the control unit 12b actuates the induction targets 14b, 50b with activation signals of the same heating frequency, phase-shifted from each other.

The operating period 16b has three time intervals 18b t<1>, t2, t3.

The control unit 12b operates the first induction target 14b in a first time interval 18b t<1> with an excess power 20b. The control unit 12b operates the first induction target 14b in a second time interval 18b t<2> with a power deficit 22b. The control unit 12b operates the first induction target 14b in a third time interval 18b t3 with a target heating power 24b.

The control unit 12b operates the second induction target 50b in a first time interval 18b t<1> with a target heating power 24b. The control unit 12b operates the second induction target 50b in a second time interval 18b t<2> with an excess power 20b. The control unit 12b operates the second induction target 50b in a third time interval 18b t3 with a power deficit 22b.

The control unit 12b actuates the first and second induction targets 14b, 50b with trigger signals of equal heating frequency fi with a reciprocal phase shift ^<1> in the first time interval 18b t<1>.

The corresponding activation sequences 58b are shown in the form of an S-matrix 56b. The S-matrix 56b has in each row exactly one power excess 20b and exactly one power deficit 22b. A number of columns of the S-matrix 56b is greater by 1 than a number of rows of the S-matrix 56b. The number of columns of the S-matrix 56b represents a number of time intervals 18b. The number of rows of the S-matrix 56b represents a number of induction targets 14b, 50b.

Figure 9 shows a procedure for putting the cooking appliance device 10 into operation.

In a determination step 72 of the method, a number of induction targets 14, 50, 66, 68 is determined and a dimension of a matrix S 56 is set. A number of rows of the matrix S 56 is equal to a number of induction targets 14, 50, 66, 68. A number of columns of the matrix S 56 is greater by 1 than a number of rows of the matrix S 56. The number of columns of the matrix S 56 is equal to a number of time intervals 18 of an operating period 16.

In a search step 74 of the method, an activation scheme 64 is searched for taking into account the constraints set in the S-matrix 56. The activation scheme 64 has activation sequences 58. The activation sequences 58 have activations without intermodulation spurious signals of the induction targets 14, 50, 66, 68 from a catalogue of activation sequences 58.

In a calculation step 76 of the procedure, a system of equations Px = b is solved to determine the time durations of the time intervals 18.

In a power matrix P, the output heating powers 48 are collected when the activation scheme 64 determined in the search step 74 is applied to the induction targets 14, 50, 66, 68. A number of rows n of the power matrix P is equal to a number of induction targets 14, 50, 66, 68. A number of columns m of the power matrix P is equal to a number of time intervals 18. The number of columns m of the power matrix P is greater by 1 than the number of rows n of the power matrix P. A component Pnm indicates an output power of an nth induction target in an mth time interval 18. For example, a component P<11> indicates an output power of the first induction target 14 in the first time interval 18.

In a theoretical heating power vector b, the theoretical heating powers 24 requested by a user for induction targets 14, 50, 66, 68 are combined. The theoretical heating power vector b is a column vector of length n. An n-th component b<1> of the theoretical heating power vector b reflects a theoretical heating power 24 of an n-th induction target 14 set by the user. A second component b<2> of the theoretical heating power vector b reflects, for example, a theoretical heating power 24 of the second induction target 50 set by the user.

In a time duration vector x, the time durations of the 18 time intervals are collected. The time duration vector x is a column vector of length m. An m-th component xm of the time duration vector x reflects the time duration of an 18 m-th time interval. A second component x<2> of the time duration vector x reflects, for example, the time duration of the second 18 time interval.

The time duration vector x is unknown. In calculation step 76, the time duration vector x is calculated. In calculation step 76, the time durations of the 18 time intervals are calculated. The components of the time duration vector x take on non-negative values.

The system of equations Px = b presents one unknown, that is, the vector of time durations x. The vector of time durations x is determined from x=P-1 b by means of resolution procedures for generally known systems of equations.

In an application step 78 of the method, the induction targets 14, 50, 66, 68 are actuated in a continuous heating operating state in accordance with the activation scheme 64, taking into account the time duration vector x.

Reference symbols

10 Cooking appliance device

12 Control unit

14 First induction objective

16 Period of operation

18 Time interval

20 Excess power

22 Power deficit

24 Theoretical heating power

26 Blink parameter

28 Resonant condenser unit

30 Cooking appliance

32 Cooking field

34 Dashboard

36 Inductor

38 Classic induction hob

40 Induction cooking field

42 Support plate

44 Cooking battery

46 Viewer

48 Output heating power

50 Induction Objective

52 Total output heating power

54 Total theoretical output heating power

56 S Matrix

58 Activation sequence

60 Switch element

62 Relay

64 Activation scheme

66 Induction objective

68 Induction objective

70 Inverter unit

72 Verification step

74 Search Step

76 Calculation step

78 Application step

80 Half bridge

82 Cooking zone

84 Inverter unit

Claims (7)

Claims 1. A cooking appliance device (10), in particular a hob device, with a control unit (12) which in at least one periodically continuous heating operating state is provided 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), the control unit (12) being provided for actuating each of the induction targets (14, 50) in at least one time interval (18) of the operating period (16) with an excess of power (20) and in at least one further time interval (18) of the operating period (16) with a power deficit (22) with respect to the respective target heating power (24), a number of time intervals (18) of the operating period (16) being greater than a number of induction targets (14, 50) by exactly 1, characterised in that the control unit (12) 1. The control unit (12) comprises a control unit (12) comprising: ... 2. Cooking appliance device (10) according to claim 1, characterized in that the control unit (12) is provided to allow flickering in a controlled manner during activation of the induction targets (14, 50) and to maintain in this respect at least one flickering parameter (26) within at least one permissible range. 3. Cooking appliance device (10) according to one of the preceding claims, characterized by a resonant condenser unit (28), which is connected to both induction targets (14, 50) in at least one special continuous heating operating state. 4. Cooking appliance device (10) according to claim 3, characterized in that the control unit (12) is provided to operate the induction targets (14, 50) in the special continuous heating operating state with trigger signals that are phase-shifted relative to one another. 5. Cooking appliance device (10) according to claim 4, characterized in that the activation signals have the same heating frequency. 6. Cooking appliance (30), in particular cooking field (32), with at least one cooking appliance device (10) according to one of the preceding claims. 7. Method for operating a cooking appliance device (10), in particular a cooking range device, in particular according to one of claims 1 to 5, during which at least one first induction target (14) and at least one second induction target (50) are activated and supplied with energy repetitively with an operating period (16) in at least one periodic continuous heating operating state, where each of the induction targets (14, 50) is operated in at least one time interval (18) of the operating period (16) with an excess of power (20) and in at least one further time interval (18) of the operating period (16) with a power deficit (22) with respect to the respective target heating power (24), where a number of time intervals (18) of the operating period (16) is greater than a number of induction targets (14, 50) by exactly 1, characterized in that each of the induction targets (14, 50) is operated in at least one time interval (18) of the operating period (16) with an excess of power (20) and in at least one further time interval (18) of the operating period (16) with a power deficit (22) with respect to the respective target heating power (24), where a number of time intervals (18) of the operating period (16) is greater than a number of induction targets (14, 50) by exactly 1, characterized in that the induction targets (14, 50) are actuated in exactly one time interval (18) of the operating period (16) with an excess of power (20) and in exactly another time interval (18) of the operating period (16) with a power deficit (22) with respect to the corresponding theoretical heating power (24), and because the induction targets (14, 50) are actuated in the remaining time intervals (18) of the operating period (16), different with respect to the time interval (18) and the other time interval (18), with the corresponding theoretical heating power (24).