ES2673100B1 - Cooking appliance device and method for putting into operation a cooking appliance device - Google Patents

Description

DESCRIPTION

DEVICE FOR COOKING APPARATUS AND PROCEDURE

FOR THE COMMISSIONING OF A DEVICE FOR

COOKING APPARATUS

The invention relates to a cooking appliance device according to the preamble of claim 1 and to a method for putting into operation a cooking appliance device according to claim 14.

From the state of the art, for example, cooking appliance devices realized as induction cooking fields comprising a heating device with at least one inductor, at least one resonant capacity associated with the inductor, and at least one investor. In order to detect the heating current, current transformers and / or measurement resistors are generally used here.

The invention solves the technical problem of providing a generic cooking appliance device with better properties in terms of efficiency. According to the invention, this technical problem is solved by the features of claim 1 and the features of claim 14, while advantageous embodiments and improvements of the invention can be extracted from the secondary claims.

The invention relates to a cooking appliance device, in particular, to a cooking field device and, advantageously, to an induction cooking field device, with at least one heating device comprising at least one heating unit, at least one resonant capacity associated with the heating unit, and at least one inverter that is intended to supply at least one heating current, wherein the cooking appliance device comprises at least one measuring device that is provided to detect in at least one operating state the capacity voltage of the resonant capacity in order to determine the heating current, and to supply a measuring signal correlative to the heating current by means of the capacity voltage for the purpose to evaluate and / or directly monitor the heating current. The term "intended" includes the concept of programmed, conceived and / or specifically provided. The expression that an object is intended for a particular function includes the concept relative to the object satisfying and / or performing this determined function in one or more states of application and / or operation.

The term "cooking appliance device" includes the concept of at least one part, in particular a construction subgroup, of a cooking appliance, in particular, of a cooking oven and / or, advantageously, of a cooking field. of cooking. In this case, the cooking appliance is advantageously used as an induction cooking appliance, in particular as an induction cooking oven and / or advantageously as an induction cooking range. The term "heating device" includes the concept of a circuit and / or a unit that are intended to heat at least one cooking product and / or a cooking coil and / or to supply a heating power for heating at least one cooking product and / or a cooking battery. The heating unit here has a heating element, preferably made as an inductor, and is advantageously provided for heating the cooking product and / or the cooking coil by the effects of swirling currents and / or magnetic reversal. The heating unit may also comprise more, in particular, at least two, at least three and / or at least four heating elements and / or at least one connection arrangement for connecting, disconnecting and / or switching the heating elements. The inverter is designed to supply and / or generate the heating current, in particular an oscillating electric current, preferably with a switching frequency of at least 1 kHz, advantageously at least 10 kHz, and particularly advantageously, at least 20 kHz and / or at most 160 kHz, advantageously at 120 kHz maximum and, particularly advantageously at 80 kHz maximum, to operate the heating unit. The resonant capacitance is advantageously realized as a resonant capacitor and, in at least one operating state, forms with the heating unit at least a part of an oscillating electric circuit and / or, preferably, an oscillating electric circuit. Here, the resonant capacitance has at least one operating state the capacitance voltage and / or is designed to supply the capacitance voltage. The term "capacity voltage" includes the concept of the voltage stored in a capacity, in particular, in the resonant capacity and / or the voltage that descends through the capacity, in particular, of the resonant capacity. The capacitance voltage can correspond here to the voltage between two defined potential values and / or to the voltage between a defined potential value and a ground potential, preferably, grounded. The expression that "an object is associated with another object" includes the concept relative to the fact that, in at least one operating state, there is at least one electrically, preferably direct, conducting connection between the object and the other object.

The term "measuring device" includes the concept of a circuit and / or of a unit in connection of effect with the heating device and, advantageously, with the resonant capacity, which is at least provided for. to generate and / or supply using the capacitor voltage a measurement signal correlated to the heating current, at least in order to determine at least the value of the heating current and / or, advantageously, to determine the evolution temporary heating current. Advantageously, the measuring device is here electrically connected to the heating device. The term "measurement signal correlated to the heating current" includes the concept relative to a measurement signal, in particular, a current signal and / or, advantageously, a voltage signal, by means of which determining at least the value of the heating current and / or, advantageously, the time course of the heating current and / or reproducing, advantageously directly, at least the value of the heating current and / or , advantageously, the time evolution of the heating current. The measurement signal can also correspond here to the heating current. Also, the cooking appliance device may comprise at least one other unit, in particular, at least one detection unit, at least one evaluation unit and / or, advantageously, a calculation unit, which may be provided to the less to detect, to process, to continue processing and / or to evaluate the measurement signal. The term "calculation unit" includes the concept of an electrical and / or electronic unit that presents an information input, an information processing, and an information output. Advantageously, the calculating unit further has a processor, at least one memory, at least one input and output means, at least one operating program, at least one control routine, at least one control routine and / or minus a calculation routine. Preferably, the calculation unit can deduce at least the value of the heating current and / or, advantageously, the time evolution of the heating current, at least by means of the measurement signal and / or can determine , advantageously directly, at least the value of the heating current and / or, advantageously, the time evolution of the heating current. Also, the calculation unit can be provided for determining, by means of the measuring signal, other variables of the cooking appliance device, such as, for example, the emission of power from the heating unit. In addition, the calculation unit is preferably provided for directing and / or regulating the operation of the cooking appliance device, in particular, of the inverter. By means of this embodiment, a cooking appliance device with better properties in terms of its efficiency, in particular, its temporal efficiency, its relative efficiency to the measurement, its efficiency relative to the power, the efficiency relative to its components, can be provided. the efficiency relative to its construction space and / or its cost efficiency. In addition, the accuracy of the measurement can be improved by using a resonant capacity with a precise capacity value and / or thanks to the advantageously simple calibration of the resonant capacity. In addition, it is possible to dispense with additional components, such as, for example, voltage and / or current measuring units, so that it is possible to save advantageously in the construction space and / or reduce costs. In addition, the control algorithm of the cooking appliance device can be simplified and / or the operational safety improved.

Preferably, the measurement signal is a signal of the voltage correlated to the heating current, whereby a measurement and / or continuation of the processing of the advantageously simple measurement signal is achieved.

If the measuring signal is proportional to the heating current, in particular to the progression of the heating current, the heating current can be evaluated in an advantageously direct and / or simple way, advantageously without the use of calculation algorithms complicated.

Furthermore, it is proposed that the measuring device comprises a drive stage that is intended to transform, in particular, to reshape and / or adapt, at least partially, the capacity voltage, in order to generate the measurement signal. In this way, the heating current can be determined advantageously directly.

The drive stage could be connected to the resonant capacitance, for example, without contact and / or could be connected in series with the resonant capacitance and could thus be, for example, integrated in a circuit of the heating device. However, it is advantageously proposed that the drive stage be connected at least partially in parallel to the resonant capacity, so that an advantageously safe operation measurement can be achieved, since the intensity of the operating current in the device of measurement and / or at least in the actuation step is advantageously reduced at least in comparison with the intensity of the current in the heating device.

In a particularly preferred embodiment of the invention, it is proposed that the driving step be carried out as a differentiator, and that the measuring signal correspond to the temporary derivative of the capacity voltage, generated by the driving step. In this way, the heating current can be determined particularly economically and / or simply with the use of the capacity voltage of the resonant capacity.

The driving stage can be carried out in an active manner and comprise at least one operational amplifier. However, it is preferably proposed that the actuation step be carried out passively. The term "active object" includes the concept of an object that is intended to be actively directed and / or activated and / or which requires at least a supply voltage for its operation.The term "passive object" includes the concept of an object that, during its start-up and / or in an operating state, does not present any possibility of activation and / or supply voltage. Thus, an efficient drive stage can be provided. In addition, fatigue strength and / or durability of the cooking appliance device can be advantageously increased.

Also, the drive step could be carried out, for example, as an inductive driving stage and / or comprise at least one inductance. However, it is preferably proposed that the drive stage be implemented as a capacitive drive stage. Here, the drive stage comprises at least one transformer capacity and, advantageously, a transformer capacitor. Particularly preferably, the drive stage is implemented as an RC element (resistor-capacitor). In this way, the costs and / or the necessary construction space can be reduced.

In another embodiment of the invention, it is proposed that the drive stage defines the transforming cutoff frequency, which at least corresponds to the triple, advantageously, at least with the quintuple, preferably with at least 10 and, particularly preferably, at least 20 times the switching frequency of the inverter, in particular, the switching frequency of the inverter mentioned above. The term "transforming limit frequency" includes the concept of a limit frequency of the drive stage, above which or below which the frequencies of the capacitance voltage signals are blocked and / or at least partially weaken and / or above which or below which the frequencies of the capacity voltage signals are exempted at least in part from a transformation effected by the drive stage. Thus, advantageously high measuring accuracy is achieved.

An advantageous attenuation of the parasitic frequencies and / or of the noise of the signals can be achieved and, thus, an advantageously easy to process measurement signal, if the measuring device comprises at least one filtering unit, which is provided for to reduce at least partially the parasitic frequencies and / or the noise of the signals. Preferably, the filtering unit is here connected in parallel to the drive stage, is pre-connected to the drive stage, and is provided for filtering the capacity voltage. In this case, the filtering unit is advantageously arranged between the resonant capacity and the driving stage. Alternatively or additionally, the filtering unit may be connected after the drive step, and may be provided for filtering the measurement signal. In this case, the filtering unit is preferably arranged between the drive stage and another unit of the cooking appliance device, advantageously, the other unit mentioned above. Particularly preferably, the measuring device can comprise at least two filter units.

It is also proposed that the cooking appliance device comprises a decoupling unit, which is designed to galvanically separate the heating device and the measuring device from one another. The decoupling unit can be designed as any decoupling unit, for example as an inductive decoupling unit, as an optical decoupling unit and / or as a capacitive decoupling unit. Advantageously, the decoupling unit comprises at least one decoupling capacity. The decoupling unit can also be designed as decoupling capacity. In this way, the provisions regarding safety and / or increase operational safety can be complied with.

In a further preferred embodiment of the invention, it is proposed that the cooking appliance device comprises an adaptation unit, in particular, an adaptation unit to the measuring range, which is provided to overlap the measurement signal with a signal from displacement, advantageously, a displacement tension, constant. The measuring device can comprise the adaptation unit here. Thus, an advantageous adaptation to the measuring range can be achieved.

Likewise, a method is proposed for the start-up of a cooking appliance device, which has at least one heating device that comprising at least one heating unit, at least one resonant capacity associated with the heating unit, and at least one inverter which is intended to supply at least one heating current, wherein the voltage of the at least one operating state is detected. capacity of the resonant capacity in order to determine the heating current by means of a measuring device, and a measurement signal correlated to the heating current is supplied by means of the capacity voltage in order to evaluate and / or advantageously monitor Directly the heating current. In this way, efficiency can be increased, in particular, the temporal efficiency, the relative efficiency of the measurement, the relative efficiency to the power, the relative efficiency to its components, the efficiency relative to its construction space and / or the cost efficiency. In particular, the accuracy of the measurement can be improved by using a resonant capacity with a precise capacity value and / or thanks to the advantageously simple calibration of the resonant capacity. In addition, it is possible to dispense with additional components, such as, for example, voltage and / or current measuring units, so that it is possible to save advantageously in the construction space and / or reduce costs. In addition, the control algorithm of the cooking appliance device can be simplified and / or the operational safety improved.

The cooking appliance device and the method for putting into operation the cooking appliance device described are not limited to the above-mentioned application or embodiment, and may in particular have a number of elements, components, and components. particular units that differs from the amount mentioned in this document, provided that it is pursued in order to fulfill the functionality described herein.

Other advantages are drawn from the following description of the drawing. Exemplary embodiments of the invention are represented in the drawing. The drawing, the description and the claims contain numerous characteristics in combination. The person skilled in the art will consider the features advantageously also separately, and will bring them together in other reasonable combinations.

They show:

FIG. 1 shows a cooking appliance made by way of example as an induction cooking range with a cooking appliance device, in schematic top view,

Fig. 2 a simplified connection diagram of the cooking appliance device, Fig. 3 a schematic graph of some signals of the cooking appliance device,

Fig. 4 another schematic graph of some signals of the cooking appliance device,

Fig. 5 a simplified circuit diagram of another cooking appliance device,

Fig. 6 a simplified circuit diagram of another cooking appliance device, and

Fig. 7 a simplified circuit diagram of another cooking appliance device.

FIG. 1 shows a cooking appliance 32a made, by way of example, as a cooking range, in the present case, as an induction cooking field, in schematic top view. The cooking appliance 32a is intended to heat at least one cooking product and / or a cooking coil (not shown). However, the cooking appliance could also be realized in principle as a baking oven and, preferably, as an induction cooking oven.

The cooking appliance 32a comprises a cooking appliance device. The cooking appliance device has a control unit 34a. The control unit 34a serves for the user to enter and / or select different parameters such as, for example, the degree of power. To direct its operation, the cooking appliance device further comprises a calculating unit 36a. The calculating unit 36a presents a processor, a memory, and an operating program stored in the memory, which is intended to be executed by the processor.

Figure 2 shows a connection diagram of the cooking appliance device. The cooking appliance device comprises an energy source 38a. In the present case, the power source 38a is made, by way of example, as a connection to the network. In addition, the cooking appliance device comprises a rectifying unit (not shown). The rectifying unit is provided for rectifying the mains voltage of the power source 38a and for supplying it to an energy storage unit 40a of the cooking appliance device. As an alternative, the use of a power source, in particular, of a voltage source, other than a connection to the network, is conceived. Also, when using a DC voltage source, an additional rectifying unit could also be dispensed with.

Also, the cooking appliance device comprises a heating device 10a. The heating device 10a is in effect connection with the energy source 38a and is intended to supply in a functional state at least one heating power for heating the cooking product and / or the cooking coil.

The heating device 10a has a heating unit 12a. In the present case, the heating unit 12a comprises, by way of example, exactly one heating element. The heating element is designed as an inductor. In the present case, the heating unit 12a is associated with at least one heating zone and is intended to directly heat the cooking product and / or the cooking coil by effects of swirling currents and / or magnetic inversion. As an alternative, it is conceived that a heating unit comprises several heating elements, advantageously realized as inductors and / or a connection arrangement for switching between the heating elements. In addition, at least one heating element of a heating unit and / or all heating elements of a heating unit could also be made as a heating resistor.

In addition, the heating device 10a comprises an inverter 18a. The inverter 18a comprises two inverter switches 42a, 44a. The inverter switches 42a, 44a are identical to each other and are realized as bidirectional unipolar semiconductor switches. Each of the inverter switches 42a, 44a comprises in this case an inverter connection element realized as an IGBT (Insulated-Gate Bipolar Transistor). Each of the inverter switches 42a, 44a is electrically conductively connected to a central socket 46a of the inverter 18a. The inverter 18a is provided for transforming the pulsed rectified network voltage of the energy storage unit 40a into a high frequency heating current i0, supplying it to the central outlet 46a, and supplying it in particular to the heating unit 12a. In the present case, the switching frequency of the inverter 18a is between 10 kHz and 100 kHz and, advantageously, between 20 kHz and 80 kHz. As an alternative, it is also conceivable that the inverter switches are configured in a different way and / or use a diode and / or a storage capacity connected in parallel to an inverter connection element. Also, at least one inverter switch could also comprise an inverter connection element made as a transistor, FET (Field-Effect Transistor) and / or MOSFET (Metal-Oxide Semiconductor Field-Effect Transistor).

Also, the heating device 10a comprises at least one resonant capacity 14a, 16a. In the present case, the cooking appliance device comprises, for example, two resonant capacities 14a, 16a, namely, a first resonant capacity 14a and a second resonant capacity 16a, wherein each of the resonant capacities 14a, 16a interacts with at least one of the inverter switches 42a, 44a. The resonant capacities 14a, 16a are made with the same construction and as capacitors. In the present case, the resonant capacities 14a, 16a have in each case a capacity with a value of 520 nF. Likewise, the resonant capacities 14a, 16a are associated with the heating unit 12a and are connected to it. The term "connected" includes the concept of directly connected in an electrically conductive manner. Accordingly, the resonant capacitances 14a, 16a are in each case a constituent part of an oscillating electric circuit and can be charged through the inverter 18a. However, a heating device could also have, in principle, exactly a resonant capacity. In addition, it is conceived that the resonant capacities are configured differently from each other.

In the present case, the first terminal of the inverter 18a is connected to the first terminal of the energy storage unit 40a and to the first terminal of the first resonant capacity 14a. The second terminal of the inverter 18a is connected to the second terminal of the energy storage unit 40a and to the second terminal of the second resonant capacity 16a. The central socket 46a of the inverter 18a is connected to the first terminal of the heating unit 12a. The second terminal of the heating unit 12a is connected to the second terminal of the first resonant capacitor 14a and to the first terminal of the second resonant capacitor 16a. Also, the second terminal of the first resonant capacitor 14a is connected to the first terminal of the second resonant capacitor 16a. Therefore, the heating unit 12a is arranged in the bridge branch between the central socket 46a and the resonant capacities 14a, 16a. In the present case, the heating unit 12a is operated in a half-bridge connection. As an alternative, it is conceivable that a heating unit is operated in a complete bridge connection.

Also, the cooking appliance device comprises a measuring device 20a. The measuring device 20a is in effect connection with the heating device 10a, in the present case, with the second resonant capacity 16a in particular. In this case, the measuring device 20a is connected to the heating device 10a, with the second resonant capacity 16a in particular. In addition, the measurement device 20a is in effect connection with the calculating unit 36a. In the present case, the measuring device 20a is connected to the calculation unit 36a.

The measuring device 20a is designed to determine the heating current i0, in the present case, the time progression of the heating current i0. For this purpose, the measuring device 20a is designed to detect in at least one operating state the capacity voltage vc of the second resonant capacitor 16a, and to supply a measurement signal S correlative to the heating current i0 by means of the capacity voltage vc of the second resonant capacity 16a. The measurement signal S is here a signal of the voltage correlated to the heating current i0 and, in the present case, is proportional to the heating current i0. To process and / or further process the measurement signal S, the calculating unit 36a may further comprise, for example, an analog-digital converter connected after the measuring device 20a. As an alternative, the measuring device could, however, also be connected to another unit of the cooking appliance device that differs from a calculation unit, for example, with a detection unit, with a measuring unit and / or with a measuring unit. an evaluation unit. In addition, the measuring device could also be connected additionally or alternatively with a first resonant capacitance. Also, a measurement signal from a measuring device could also correspond to a current signal. On the other hand, the cooking appliance device could in principle comprise, in addition to a measuring device, other measuring units, in particular, voltage and / or current measuring units, in order to increase the safety of the operation. However, it is preferred that the cooking appliance device does not have other measuring units.

For the generation of the measuring signal S from the capacitance voltage vc of the second resonant capacitor 16a, the measuring device 20a comprises an actuating stage 22a. The driving stage 22a is connected in parallel to the second resonant capacity 16a. In the present case, the driving step 22a follows directly to the second resonant capacity 16a, so that other components are not arranged between the driving stage 22a and the second resonant capacity 16a. The actuation stage 22a is implemented as a differentiator. In the present case, the driving step 22a is also carried out passively and does not have active components. In addition, the drive stage 22a is embodied as a capacitive drive stage, configured as an RC element, and is provided to at least partially transform the capacity voltage vc of the second resonant capacitor 16a.

For this, the drive stage 22a comprises at least one transformer capacity 48a. In the present case, the driving stage 22a comprises exactly a transformer capacity 48a. The transformer capacity 48a is realized as a capacitor and has a capacity with a value between 10 nF and 0.1 pF and, advantageously, between 1 nF and 1 pF, in the present case, for example 33 pF.

In addition, the drive stage 22a comprises at least one transformer resistor 50a. In the present case, the driving stage 22a comprises exactly one transforming resistor 50a. The transformer resistor 50a corresponds to a measurement resistor and is connected in parallel to the second resonant capacitor 16a. In the present case, the voltage that descends through the transformer resistor 50a corresponds to the measurement signal S. The transformer resistor 50a has a resistance with a value of between 100 kU and 10 Q and, advantageously, between 10 and 10. kü and 100 Q. In the present case, the transformer resistor 50a has, by way of example, a resistance with a value of 1.6 kü.

Also, the first terminal of the transformer capacitor 48a is connected to the second terminal of the first resonant capacitor 14a and to the second terminal of the heater unit 12a. In addition, the second terminal of the transformer capacitor 48a is connected to the first terminal of the second resonant capacitor 16a, to the first terminal of the transformer resistor 50a, and to the first terminal of the calculator unit 36a. Also, the second terminal of the transformer resistor 50a is connected to the second terminal of the second resonant capacitor 16a and to the second terminal of the calculator unit 36a. As an alternative, the drive stage could also comprise several transforming capacitors and / or transformer resistors. In addition, a drive step could also be performed actively and comprise, for example, at least one operational amplifier. Also, the drive stage could also comprise, in principle, at least one additional inductance.

In order to generate the measurement signal S, the actuation stage 22a is provided in the present case to derive the capacity voltage vc of the second resonant capacity 16a over time. It is applicable:

i0 = C2 ■ d / dt (vc) (1)

Here, C2 corresponds to the capacity value of the second resonant capacitor 16a.

In addition, the driving stage 22a defines the transforming cutoff frequency fc, which corresponds to at least 20 times the switching frequency of the inverter 18a. It is applicable:

fc = 1 / (2 * -Rd-Cd) (2)

Here, Rd corresponds to the value of the resistance of the transformer resistor 50a and Cd corresponds to the capacity value of the transformer capacitor 48a. Preferably, the transformer cut-off frequency fc is chosen here in such a way that at least the first five harmonics of the switching frequency of the inverter 18a can be detected.

Figure 3 shows by way of example a graph of some signals of the cooking appliance device. The ordinate axis 52a is embodied as an axis of magnitude, and the measurement signal S and the capacitance voltage vc of the second resonant capacitor 16a in volts are shown on it. The time in milliseconds is shown on the abscissa axis 54a. The curve 56a illustrates the time progression of the measurement signal S. The curve 58a illustrates the time progression of the capacity voltage vc of the second resonant capacitor 16a. The measurement signal S here has a phase shift relative to the capacitance voltage vc of the second resonant capacitor 16a as a consequence of the time derivative.

Figure 4 shows by way of example another graph of some signals of the cooking appliance device. In the present case, Figure 4 shows the evolution of the measurement signal S compared to the evolution of the heating current i0. The ordinate axis 60a is represented as an axis of magnitude. The time in milliseconds is shown on the abscissa axis 62a. The curve 56a again illustrates the time progression of the measurement signal S. The curve 64a illustrates the time progression of the heating current i0. Accordingly, the measurement signal S directly reproduces the evolution of the heating current i0.

Figures 5 to 7 show other embodiments of the invention. The following descriptions and drawings are essentially limited to the differences between the embodiments, where, in relation to components indicated in the same way, in particular, in terms of components with the same reference symbols, it can also be referred to basically drawings and / or the description of the embodiment of figures 1 to 4. For the differentiation of the embodiments, the letter "a" appears postponed to the reference symbols of the embodiment of figures 1 to 4. In the examples of embodiment of figures 5 to 7, the letter "a" has been replaced by the letters "b" to "d".

In figure 5, another embodiment of the invention is shown. The letter "b" appears postponed to the reference symbols of the embodiment example of figure 5. The other example of embodiment of figure 5 differs from the previous example of embodiment at least basically in the embodiment of the measuring device 20b.

In this case, the measuring device 20b comprises at least one filtering unit 24b, 26, in the present case, two filtering units 24b, 26b. The filtering units 24b, 26b are made at least essentially with the same construction. In particular, the filtering units 24b, 26b are made passively and do not have active components. Likewise, the filtering units 24b, 26b are embodied as a low-pass filter, they are connected in parallel to each other and in parallel with respect to the driving stage 22b and the second resonant capacity 16b.

The first filter unit 24b of the filter units 24b, 26b is pre-connected to the drive stage 22b. Here, the first filtering unit 24b is disposed between the second resonant capacitor 16b and the actuator stage 22b. The first filter unit 24b is provided to filter the capacity voltage vc of the second resonant capacitor 16b. For this, the first filtering unit 24b comprises a first filtering resistor 66b and a first filtering capability 68b, arranged in parallel to the second resonant capacitor 16b.

The second filter unit 26b of the filter units 24b, 26b is connected after the drive stage 22b. Here, the second filter unit 26b is disposed between the drive stage 22b and another unit of the cooking appliance device. The second filtering unit 26b is provided for filtering a measurement signal S generated by the driving stage 22b. For this, the second filtering unit 26b comprises a second filtering resistor 70b and a second filtering capability 72b, arranged in parallel to the second resonant capacitor 16b. Alternatively, the measuring device could, however, also have exactly one filtering unit, namely a first filtering unit or a second filtering unit, and / or have at least three filtering units. It is also conceivable that at least one filtering unit be configured as a bandpass filter.

In figure 6, another embodiment example of the invention is shown. The letter "c" appears postponed to the reference symbols of the embodiment of Figure 6.

In this case, the cooking appliance device further comprises a decoupling unit 28c. The decoupling unit 28c is designed as a capacitive decoupling unit and is designed to galvanically separate the heating device 10c and the measuring device 20c from each other.

For this, the decoupling unit 28c comprises at least one decoupling capacity 74c, in the present case, exactly one decoupling capacity 74c. The decoupling capacity 74c is embodied as a decoupling capacitor and is connected in parallel to the transformer capacity 48c of the drive stage 22c. The first terminal of the decoupling capacitor 74c is connected to the second terminal of the second resonant capacitor 16c and to the second terminal of the transformer resistor 50c of the actuation stage 22c.

It is also conceivable to combine at least two and, advantageously, all the embodiments shown in a cooking appliance device.

In figure 7, another embodiment of the invention is shown. The letter "d" appears postponed to the reference symbols of the embodiment of Figure 7.

In this case, the cooking appliance device further comprises an adaptation unit 30d. The adaptation unit 30d is designed as an adaptation unit to the measurement range, and is designed to overlap a measurement signal S, generated by the drive stage 22d, with a displacement signal, in the present case, with a voltage of displacement, constant.

For this, the adaptation unit 30d comprises at least one adaptation resistor 76d. In the present case, the adaptation unit 30d comprises exactly one adaptation resistor 76d. The adaptation resistor 76d is here connected in series to a transformer resistor 50d of the drive stage 22d. As an alternative, an adaptation resistor could, however, also be realized as a variable adaptation resistor, for example, as a potentiometer.

It is also conceivable to combine at least two, preferably at least three and, advantageously, all the embodiments shown in a cooking appliance device.

Reference symbols

Heating device

Heating unit

Resonant capacity

Resonant capacity

Investor

Measuring device

Drive stage

Filtering unit

Filtering unit

Uncoupling unit

Adaptation unit

Cooking appliance

Control unit

Unit of calculation

Power source

Energy storage unit Inverter switch

Inverter switch

Central socket

Transformative capacity

Transformer resistor

Edge of ordered

Abscissa axis

Curve

Curve

Edge of ordered

Abscissa axis

Curve

Filter resistor

Filtering capacity

Filter resistor

Filtering capacity

Uncoupling capacity

Resistor of adaptation

i0 Heating current S Measuring signal

vc Capacity voltage

Claims (14)

1. Cooking appliance device, in particular cooking field device, with at least one heating device (10a-d) comprising at least one heating unit (12a), at least one resonant capacity (16a-d) ) associated with the heating unit (12a), and at least one inverter (18a) which is provided to supply at least one heating current (i0), characterized by at least one measuring device (20a-d) which is provided to detect in at least one operating state the capacity voltage (vc) of the resonant capacity (16a-d) in order to determine the heating current (i0), and to supply a measurement signal (S) correlated to the heating current (i0) by means of the capacity voltage (vc). Cooking appliance device according to claim 1, characterized in that the measurement signal (S) is a voltage signal correlated to the heating current (i0). Cooking appliance device according to claim 1 or 2, characterized in that the measurement signal (S) is proportional to the heating current (i0). Cooking appliance device according to one of the preceding claims, characterized in that the measuring device (20a-d) comprises a drive stage (22a-d) which is designed to at least partially transform the capacity voltage (vc) ). Cooking appliance device according to claim 4, characterized in that the drive stage (22a-d) is connected at least partially in parallel to the resonant capacity (16a-d). Cooking appliance device according to claims 4 or 5, characterized in that the drive stage (22a-d) is implemented as a differentiator. The cooking appliance device according to one of claims 4 to 6, characterized in that the actuation step (22a-d) is carried out passively. Cooking appliance device according to one of claims 4 to 7, characterized in that the drive stage (22a-d) is implemented as a capacitive drive stage. The cooking appliance device according to one of claims 4 to 8, characterized in that the drive stage (22a-d) defines the transformer cut-off frequency, which corresponds to at least three times the switching frequency of the inverter ( 18). Cooking appliance device according to one of the preceding claims, characterized in that the measuring device (20b) comprises at least one filtering unit (24b, 26b), which is designed to at least partially reduce the parasitic frequencies and / or the noise of the signals. Cooking device device according to one of the preceding claims, characterized by a decoupling unit (28c), which is provided for galvanically separating the heating device (10c) and the measuring device (20c) from each other. Cooking appliance device according to one of the preceding claims, characterized by an adaptation unit (30d) which is designed to overlap the measurement signal (S) with a constant displacement signal. 13. Cooking appliance (32a) with at least one cooking appliance device according to one of the claims set forth above. Method for putting into operation a cooking appliance device according to one of claims 1 to 12, which has at least one heating device (10a-d) comprising at least one heating unit (12a), at least one resonant capacity (16a-d) associated with the heating unit (12a), and at least one inverter (18a) that is provided to supply at least one heating current (i0), where it is detected in at least one operating state the capacity voltage (vc) of the resonant capacity (16a-d) in order to determine the heating current (i0), and a measurement signal (S) correlated to the heating current (i0) is supplied ) by means of the capacity voltage (vc).