EP3967108A1

EP3967108A1 - Cooking appliance

Info

Publication number: EP3967108A1
Application number: EP20727923.3A
Authority: EP
Inventors: Alberto Dominguez Vicente; Pablo Jesus Hernandez Blasco; Ignacio Lope Moratilla; Antonio Muñoz Fumanal; Ramon Peinado Adiego; Jorge VILLA LOPEZ
Original assignee: BSH Hausgeraete GmbH
Current assignee: BSH Hausgeraete GmbH
Priority date: 2019-05-10
Filing date: 2020-05-08
Publication date: 2022-03-16
Also published as: WO2020229336A1; US20220191977A1

Abstract

The invention relates to a cooking appliance (10), in particular an induction hob device, comprising at least one control and/or regulating unit (26) which is provided, in at least one periodic time duration operating heating mode (50) associated with at least one operating period of time (42), to repetitively control at least one induction area (32, 32', 32", 32'") and to supply power and to operate the induction area (32, 32', 32", 32'") in at least one switched on time interval (40, 40') of the operating period (42) with heating power, in particular a desired heating power (30, 30') or an excess of power with respect to the desired heating power (30, 30'). In order to improve control-related properties, the control and regulating unit (26) is provided to vary, in the time duration operating heating mode (50), a heating current frequency (36) for the induction area (32, 32', 32", 32"') in the switched on time interval (40, 40') of the operating period (42).

Description

Cooking device device

The invention relates to a cooking device device according to the preamble of claim 1 and a method for operating a cooking device device according to the preamble of claim 12.

Cooking device devices and in particular cooking fields are already known from the prior art, which have inductors which are operated to heat various cooking utensils to avoid intermodulation noises, with complex control schemes for controlling inductors for heating cooking utensils as a result of increased customer requirements for example Noise load and cooking temperatures are used, which makes it difficult to comply with flicker and EMC standards, which in turn increases the complexity of the control scheme.

The document EP 3001773 B1 discloses in this context, an induction hob device with two inverters, which each operate an inductor, and with a control unit that operates two inverters in a time window of a continuous operating state and divides the time window into two time intervals where the Control unit a total achieved heating power of the at least two inverters in a transition time interval of the two time intervals continuously changed.

The document US 8686321 B2 discloses in this context, a method for supplying induction targets, each comprising an inductor, an induction stove with a heating power, wherein in a process step all inductors are supplied with the heating power on the basis of a previously determined control sequence to an operator input to comply.

The object of the invention is in particular to provide a generic cooking device device with improved properties with regard to control. The object is achieved according to the invention by the features of claims 1 and 12, while advantageous configurations and developments of the invention can be found in the sub-claims. The invention is based on a cooking appliance device, in particular an induction hob device, with at least one control and / or regulating unit, which is intended to control and at least one induction target repetitively in at least one periodic continuous heating operating state, which is assigned to at least one operating period to supply with energy and to operate the induction target in at least one switch-on interval of the operating period with a heating power, in particular a target heating power or a power excess compared to a target heating power.

It is proposed that the control and / or regulating unit is provided to vary a heating current frequency for the induction target in the switch-on interval of the operating period in the continuous heating operating state.

The inventive configuration can provide a generic Gargerätevor direction with improved properties with regard to, in particular, compliance with EMC standards with, in particular, accurate achievement of target heating capacities, and in particular flicker conformity, and in particular with regard to low-noise operation. The advantageous adherence to EMC standards can achieve a reduction in, in particular dispensing with, EMC filters. An inexpensive cooking appliance device can thereby be achieved. An energy-saving cooking appliance device can thereby be achieved. In this way, an advantageously energy-saving cooking appliance device can be formed, in particular through the use of less expensive and / or less powerful components. A low-noise and EMC standard-compliant operation of the cooking appliance device can advantageously be achieved, in particular when several induction targets are heated. In particular, it can be achieved that frequency spreading techniques can be used in combination with the activation of induction targets according to the invention. An advantageously precisely defined average heating power can be achieved on the basis of advantageous switch-on intervals. In particular, a reliable configuration can be achieved, preferably in relation to a setpoint heating power requested by the operator. In particular, it can be achieved that an average heating output in a period of time known from the prior art for the operating period, such as 10 ms for example, advantageously corresponds exactly to a target heating output desired by the operator. This can advantageously prevent intermittent boiling. In particular, advantageous melting processes of chocolate can be achieved. Loading It can be achieved particularly advantageously that the cooking appliance _device avoids a maximum power requirement of over 4.25 kW, preferably of over 3.7 kW or the equivalent of 16 A _rms . In this way, an advantageous avoidance of power failures or of a safety shutdown of the cooking appliance device can be achieved. In particular, rapid perturbations such as crockery shifting or ferromagnetic and ferrimagnetic saturations can be avoided. It can advantageously be achieved that the cooking device device can be operated to comply with EMC standards regardless of the number of induction targets and regardless of the design of the cooking device device, in particular the built-in components.

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

A “control and / or regulating unit” is to be understood in particular as an electronic unit which is preferably at least partially integrated in a cooking device device, in particular an induction hob device, and which is provided in particular to have at least one inverter unit of the cooking device device with at least one inverter, in particular a resonance inverter and / or a dual half-bridge inverter to control and / or regulate. In particular, the control and / or regulating unit evaluates a signal provided by a unit, in particular by a sensor and / or detection unit, according to which the control and / or regulating unit, in particular when at least one condition is fulfilled, a special len process and / or Can initiate operating state. The control and / or regulating unit preferably comprises a computing unit and, in particular, in addition to the computing unit, a memory unit with a control and / or regulating program stored therein which is provided to be executed by the computing unit. In particular, the cooking appliance device can have a switching unit which is designed in particular as a semiconductor switching element, in particular as a transistor. In particular, the switching unit is controlled and / or regulated by the control and / or regulating unit, the switching unit in particular establishing an electrical connection between at least one energy source and at least one energy consumer, for example one of the induction targets. The switching unit can in particular have at least one electromechanical or semiconductor-based switching element and be provided to produce at least one electrical connection at least between the at least one energy source and at least one induction target. A “switching element” is to be understood in particular as an element which is intended to establish and / or separate an electrically conductive connection between two points, in particular contacts of the switching element. The switching element preferably has at least one control contact via which it can be switched. In particular, the switching element is designed as a semiconductor switching element, in particular as a Tran sistor, for example as a metal-oxide-semiconductor field effect transistor (MOSFET) or organic field effect transistor (OFET), advantageously as a bipolar transistor with a preferably insulated gate electrode (IGBT). Alternatively, the switching element is designed as a mechanical and / or electromechanical switching element, in particular as a relay.

An “induction target” is to be understood as meaning, in particular, an inductor or a plurality of inductors, which / which is / are in particular part of the cooking appliance device, with cooking utensils placed above the inductor and / or the plurality of inductors, the inductor or the A large number of inductors in at least one particularly special operating state, in particular in at least one permanent heating operating state, in particular jointly provided to inductively heat the cooking utensils placed above the inductor or the large number of inductors. In this case, the inductors of the induction target can each provide the same heating power in comparison with one another in at least the continuous heating operating state. The control and / or regulating unit preferably controls the inductors of an induction target with the same heating current frequency. Furthermore, the inductor, in particular precisely a single inductor, of the induction target can deliver a different heating output in terms of time during at least the continuous heating operating state. The control and / or regulating unit is provided in particular to define at least one induction target. Especially the control and / or regulating unit can define several induction targets. The Gargerä device has in particular at least one inductor, in particular a plurality of inductors. An "inductor" is to be understood here in particular as an element which, in at least one continuous heating mode, supplies energy to at least one cooking utensil for the purpose of heating the cooking utensil, in particular in the form of an alternating magnetic field, which is provided in a metallic, preferably at least partially ferromagnetic heating means, in particular cooking utensils, to cause eddy currents and / or magnetic reversal effects, which are converted into heat. The inductor has, in particular, at least one induction coil and is provided in particular to supply energy to the cookware in the form of a magnetic alternating field with a heating current frequency that is variable in particular for a short time.

A “heating current frequency” is to be understood as meaning, in particular, a frequency of an electrical alternating current in a range from 20 kHz to 100 kHz, preferably 30 kHz to 75 kHz, which is applied to an inductor for generating a magnetic alternating field. “Short-term variable” should be understood to mean that a parameter can be changed in a period of time, the period of time being shorter than the operating period. The inductor is arranged in particular below and advantageously in a Nahbe rich at least one installation plate of the cooking device. In particular, the plurality of inductors can be arranged like a matrix, wherein the inductors arranged like a matrix can form a variable cooking surface. In particular, the inductors can be combined with one another for induction targets of any size, in particular with different contours. Alternatively or in addition, inductors can also be arranged in the form of a classic cooking mirror, in particular with two, three, four or five heating zones, in particular raised against the remaining surface of the mounting plate designed as a matrix hob.

The phrase “to supply an object with energy” is intended to mean, in particular, a provision of electrical energy in the form of an electrical voltage, an electrical current and / or an electrical and / or electromagnetic field from at least one energy source for the object. An “energy source” should in particular be understood to mean a unit which generates electrical energy in the form of an electrical voltage, an electrical current and / or an electrical and / or electromagnetic field at least one further unit and / or at least one electrical circuit. The energy source can in particular be an electrical current phase of a power supply network. In particular, the energy source can provide a maximum power of 3.7 kW through a regulation unit or be limited to a maximum power output of 3.7 kW. An inverter unit can advantageously be arranged between the energy source and at least one induction target, preferably all induction targets, for providing a high-frequency supply voltage with a suitable, in particular short-term variable, heating current frequency. The energy source can in particular also have an inverter unit. In particular, the inverter unit, in particular the cooking appliance device, can have at least one, in particular at least two or even more inverters for providing a high-frequency voltage with a suitable, in particular short-term variable, heating current frequency for induction targets. In particular, a heating current frequency is different from the frequency of a supply voltage. The control and / or regulating unit is preferably provided to select and / or set the heating current frequency in a range from 20 kHz to 100 kHz, preferably 30 kHz to 75 kHz. In particular, each induction target has its own maximum frequency with which it can be operated. The maximum frequency of an induction target depends on the design, the components and other technical limitations. For example, the maximum frequency of an induction target can be 75 kHz or 100 kHz. An induction target operated at its maximum frequency generates a minimum possible heating output, in particular output heating output, in particular during its switch-on time. An "output heating power" of an induction target is to be understood as meaning, in particular, electrical power which the at least one inductor of the at least one induction target converts to a cooking utensil of the at least one induction target in at least one time interval, in particular at least one switch-on interval, the operating period of the continuous heating mode Provides heating.

A "continuous heating operating state" is to be understood in particular as an operating state which is different from a frequency sweep state and in which a special control of a unit, in particular of at least one induction target, in particular of at least two induction targets, to achieve a target heating power over the duration of the state and / or the control and / or Control unit is provided to apply a special method and / or a special algorithm to the unit, in particular to the induction targets to achieve a target heating power over the duration of the state, with the control and / or regulating unit in particular the at least one, in particular the at least operates two induction target (s) in a coordinated manner. In particular, the continuous heating mode lasts, in particular uninterrupted in time, at least 10 ms, preferably at least 1 s, advantageously at least 60 s and particularly preferably at least 30, 30Ό s, the control and / or regulating unit being provided in particular for at least one induction target of electrical energy in the form of an output heating power, in particular by means of the applied, in particular short-term variable, heating current frequency, the output heating power advantageously not equal to 0, in particular greater than 0, and in particular corresponding to a target heating power on a time average. In particular, in the continuous heating operating state there is an increase in temperature of a cookware of the induction target and / or a temperature increase and / or an at least partial phase transition of an item to be cooked in the cookware. In particular, the temperature increase of the cookware and / or the food to be cooked is in particular at least 0.5 ° C., advantageously at least 1 ° C., preferably at least 5 ° C. and particularly preferably at least 10 ° C. In particular, a mass fraction of the item to be cooked that undergoes a phase transition is at least 1%, advantageously at least 5%, preferably at least 10% and particularly advantageously at least 20%. In particular, the continuous heating operating state is different from a frequency sweep state. A “frequency sweep state” should be understood to mean a state in which the control and / or regulating unit is provided to record and / or measure an available frequency spectrum with the associated heating outputs, in particular output heating outputs, for at least one induction target sen and save.

In the continuous heating operating state, the control and / or regulating unit provides in particular at least one output heating output of the at least one induction target, advantageously at least a large part of the output heating output of the at least one induction target and preferably all output heating output of the at least one induction target by means of a heating current frequency and / or, in particular, for a short period of time by means of mutually phase-shifted control signals and / or by means of a duty cycle. “Repetitive control” of a unit or “repetitive control” of a unit should be understood here to mean, in particular, control of a unit that is periodically repeated in the at least one permanent heating operating state, in particular with an electrical signal. The induction target is preferably driven repetitively with the operating period in the continuous heating operating state. The control and / or regulating unit preferably repeats the activation from a single operating period of at least one induction target within a single continuous heating operating state, in particular until this continuous heating operating state is ended by an operator input. In particular, the operating period, in particular the activation of the induction targets of an operating period, is repeated over the entire duration of the continuous heating operating state.

An “operating period” is to be understood in particular as a period of time during which the control and / or regulating unit is provided to operate the induction target in a continuous heating operating state. In particular, the induction target is activated during the operating period, with the induction target being able to be supplied with electrical energy, it being possible for the electrical energy to be negligible. Preferably, the duration of an operating period corresponds to a period of a rectified AC supply current and / or AC supply voltage. The control and / or regulating unit is preferably provided to supply and / or operate the at least one induction target with an average electrical power within an operating period of the continuous heating operating state. An “average electrical power” is to be understood as meaning, in particular, electrical power averaged over a period of time, in particular over an operating period, in particular supplied to the induction target. The average electrical power preferably corresponds to a setpoint heating power set in particular by the operator. A “target heating output” should be understood to mean the output desired by an operator, which is to be supplied to an induction target at least in the time average of the continuous heating operating state. In particular, a target heating output can also be a zero heating output. A “zero heating output” is understood to mean a negligibly low output. Each different operator input of a target heating output preferably leads to a different continuous heating operating state, in particular to a different activation of the at least one induction target in the operating period of the continuous heating operating state. A “power excess” of an induction target is to be understood in particular as a power whose mean value, based on a time interval of the operating period, exceeds the average power, in particular the target heating power, of the induction target within an operating period of the continuous heating operating state. In particular, the control and / or regulating unit is provided to achieve the excess power by applying an electromagnetic alternating field with a heating current frequency different from a target frequency.

A “target frequency” is to be understood as a heating current frequency which, when the at least one induction target is in operation, achieves a target heating power required and / or set by the operator in the induction target at any time. In particular, the excess power can be achieved when the hob device is operated in a ZVS mode with a heating current frequency which is less than the target frequency. In particular, the excess power can be achieved when the hob device is operated in a ZCS mode with a heating current frequency which is higher than the target frequency. A “ZVS mode” is to be understood in particular as a zero voltage switching mode in which a voltage with a value of approximately zero is present when a switch element is switched. A “ZCS mode” is to be understood in particular as a zero-current switching mode in which a current with a value approximately equal to zero is present when a switch element is switched. In particular, the heating current frequencies are selected by the control and / or regulating unit in such a way that the heating current frequencies do not generate any intermodulation interference signals that can be acoustically perceived by people with average hearing. In particular, the intermodulation interference signals result from a coupling of at least two heating current frequencies which have a frequency spacing from one another of less than 20 kHz, in particular less than 17 kHz.

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

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

The operating period has at least one time interval, in particular switch-on interval, in which the control and / or regulating unit operates the induction target with a heating current frequency, in particular to achieve an output heating output, in particular a target heating output, in the at least one induction target. The operating period can have at least one time interval, in particular switch-off interval, in which the induction target is operated free of a heating current frequency, in particular to achieve zero heating power in the at least one induction target. In particular, the operating period can be divided into at least two time intervals during which the control and / or regulating unit operates the induction target. A “time interval” is to be understood as meaning, in particular, a period of time whose duration is longer than 0 s and shorter than or equal to the operating period. A sum, in particular a duration of the sum, of all time intervals of the operating period of individual induction targets corresponds exactly to a duration of the operating period of the respective induction target. In particular, individual time intervals can have different durations from one another.

The control and / or regulating unit is preferably provided to select a target frequency in the continuous heating operating state with which the induction target essentially constantly achieves the target heating power set by an operator. The control and / or regulating unit is provided, in particular, to determine the electrical conductance of the induction target that matches this target frequency in the permanent heating mode. The control and regulating unit is provided in particular to vary the heating current frequency at least ten times, preferably at least twenty times, preferably at least a hundred times, in the continuous heating operating state. The control and regulation unit is intended in particular to be used in the continuous heating mode was able to vary the heating current frequency a maximum of seven hundred and fifty times, preferably a maximum of a thousand times, during the operating period. The control and regulating unit is in particular provided to vary the heating current frequency in the operating period in the continuous heating mode in order to counteract a distortion of the waveform of the supply current due to the dependence of the waveform of the supply current on the signal level, in particular the amplitude, and the temperature, especially for compliance with EMC standards. The control and regulating unit is particularly intended to measure the heating current frequency or a proportional operating parameter in the operating period at least ten times, preferably at least twenty times, preferably at least a hundred times, in the continuous heating mode. A “supply alternating voltage” is to be understood in particular as the 50 Hz, in particular 60 Hz, alternating voltage from the power supply network.

It is also proposed that the control and / or regulating unit be provided to keep at least one impedance of at least one unit having the induction target at least substantially constant within the switch-on interval in the continuous heating operating state. In particular, the waveform of the supply current is distorted by a variation in the impedance of the unit which comprises at least the induction target, in particular because the impedance is dependent on the material of the cookware. The control and / or regulating unit is provided in particular to keep the impedance of the at least one unit having the induction target at least essentially constant within the switch-on interval by varying, in particular regulating, the heating current frequency in the switch-on interval. Preferably, the unit having the induction target includes at least one resonance capacitor unit. The at least one resonance capacitor unit comprises at least one, preferably two, capacitors. The control and / or regulating unit is preferably provided to operate the unit having the induction target as a resonant circuit in the continuous heating operating state. The unit having the induction target preferably comprises at least one inductor, at least one resonance capacitor unit and a piece of cookware. “Keep essentially constant” is preferably to be understood as meaning that the control and / or regulating unit is particularly preferred to maintain an operating parameter up to deviations of a maximum of 25%, preferably 10%, particularly preferably 5% over at least 70%, preferably at least 80% at least 90% of a corresponding Controls and / or regulates time span to a value. A reduction in the distortion of the waveform of the supply current can thereby advantageously be achieved.

It is further proposed that the control and / or regulating unit is provided to keep at least one real conductance, at least one unit having the induction target, constant within the switch-on interval in the continuous heating operating state. A “real conductance” should preferably be understood to mean a conductance, a reciprocal value of the real part of the impedance, in particular of the effective resistance. The control and / or regulating unit can preferably determine a target frequency from an operator input of the target heating power. In particular, during operation with the target frequency as the heating current frequency, the induction target can constantly provide the target heating power in the operating period, in particular also averaged over the operating period. Preferably, the control and / or regulating unit can determine the real conductance of the unit having the induction target via the heating power, in particular the output heating power, at the target frequency. The control and / or regulating unit preferably determines the real conductance for a target heating output before the start of the first operating period of the continuous heating operating state. It is conceivable that the control and / or regulating unit is provided to determine the real conductance of a unit having the induction target for each target heating power, in particular for each possible heating current frequency, in the frequency sweep state. It is also conceivable that the control and / or regulating unit is provided to start the frequency sweep state when a piece of cookware is set up above an inductor. It is conceivable that a continuous heating operating state can only be assumed by the control and / or regulating unit after the end of the frequency sweep state. Preferably, the control and / or regulating unit is provided to keep the real conductance, at least of the unit having the induction target, constant within the switch-on interval via a variation of the heating current frequency in the continuous heating operating state. The control and / or regulating unit can preferably determine the real conductance, in particular the conductance or the reciprocal of the real part of the impedance, using the following equation: where G is the real conductance and the square brackets with subscript T express an average operator over time, the current which is applied to the unit having the induction target, in particular in series at the induction target and the resonance capacitor unit, vo (t) is that for each Time t applied voltage which is applied to the unit having the induction target and v ₀ , _rm s is the root mean square of the voltage v ₀ (t). The control and / or regulating unit can calculate root mean square values and mean values over a number N of periods of the heating current, preferably at least 100 ps. Preferably, a period of the heating current is between 12.5 ps and 50 ps long. The control and / or regulating unit preferably calculates the root mean square values and average values, for example the voltage vo, over at least eight, preferably at least ten, preferably at least twelve, particularly preferably at least fifteen, periods of the heating current to provide reliable values with a maximum Error of +/- 10%, preferably +/- 5%. The control and / or regulating unit can vary the heating current frequency after each calculation of the real conductance in order to keep the real conductance constant. It is conceivable that the control and / or regulating unit calculates the impedance, in particular the reciprocal of the real conductance, just as often during the operating period, for example every 50 ps, as the real conductance. In this way it can advantageously be achieved that despite a variation in the heating current frequency in the operating period, the target heating output is achieved on average over the operating period. This enables an advantageous cooking environment with EMC compliance to be achieved.

In addition, it is proposed that the control and / or regulating unit is provided to keep a complex conductance constant within the switch-on interval in the continuous heating operating state, at least one unit having the induction target. A "complex conductance" should preferably be the admittance, a reciprocal value of the impedance or the alternating current resistance. The control and / or regulating unit can preferably determine a target frequency from an operator input of the target heating power. In particular, during operation with the target frequency as the heating current frequency, the induction target can constantly provide the target heating power in the operating period, in particular also averaged over the operating period. At the target frequency, the control and / or regulating unit can preferably determine the complex conductance of the unit having the induction target via the heating power, in particular the output heating power. The control and / or regulating unit preferably determines the complete xen conductance for a target heating output before the start of the first operating period of the continuous heating operating state. It is conceivable that the control and / or regulating unit is provided to determine the complex conductance of a unit having the induction target for each target heating output, in particular for each possible heating current frequency, in the frequency sweep state. The control and / or regulating unit is preferably provided in the continuous heating operating state to keep the complex conductance constant at least of the unit having the induction target within the switch-on interval by varying the heating current frequency. The control and / or regulating unit can preferably determine the complex conductance, in particular the admittance, in particular the reciprocal of the impedance, using the following equation. where Y is the complex conductance and i _L , _r ms is the root mean square of the current which is applied to the unit having the induction target, in particular in series at the induction target and the resonance capacitor unit. The control and / or regulating unit can calculate root mean square values and mean values over a number N of periods of the heating current, preferably at least 100 ps. Preferably, a period of heating current is between 12.5 ps and 50 ps long. The control and / or regulating unit preferably calculates the root mean square values and average values, for example of the current ii_, rms, over at least eight, preferably at least ten, preferably at least twelve, particularly preferably at least fifteen, periods of the heating current to provide reliable values a maximum error of +/- 10%, preferably +/- 5%. The control and / or regulating unit can vary the heating current frequency after each calculation of the complex conductance to keep the complex conductance constant. It is conceivable that the control and / or regulating unit calculates the impedance, in particular the reciprocal of the complex conductance, just as often in the operating period, for example every 50 ps, as the complex conductance. It is conceivable that the control and / or regulating unit calculates the impedance, in particular the reciprocal of the complex conductance, just as often during the operating period, for example every 50 ps, as the complex conductance, in particular to keep the impedance of the induction target constant as an alternative Unit. It can thereby advantageously be achieved that the supply current is distorted by keeping it constant of the complex master value is minimized. It is thereby achieved that the cooking device device can precisely adhere to EMC standards, particularly advantageously.

It is further proposed that the control and / or regulating unit is provided to control and / or regulate the heating current frequency around a target frequency in the continuous heating operating state. It can advantageously be achieved in this way that the heating output achieved essentially corresponds to the target heating output at any point in time. As a result, an advantageous adherence to the target heating power can be achieved despite the variation in the Heizstromfre frequency during the operating period.

It is also proposed that the control and / or regulating unit is provided to continuously change the heating current frequency in the switch-on interval in the continuous heating operating state. In this context, “to be changed continuously” should preferably be understood as meaning that the heating current frequency is changed, in particular adjusted, at least ten times, preferably at least twenty times, preferably at least twenty-five times, particularly preferably at least fifty times, at constant intervals during the operating period. As a result, it is advantageously possible to maintain a predetermined operating parameter, in particular the real conductance value, the complex conductance value and / or the impedance, with a constant constant.

It is also proposed that the control and / or regulating unit is provided to apply at least one frequency spread to at least one harmonic of at least one of the heating current frequencies by means of at least one reference curve of the real and / or the complex conductance of at least the unit having the induction target in the continuous heating operating state . The control and / or regulating unit preferably applies a frequency spread in a central range, in particular a middle 60%, of the operating period, in particular when the operating period corresponds to half the period duration of an AC supply voltage. The control and / or regulating unit can preferably use frequency spreads in order to weaken harmonics, in particular harmonics, of the heating current frequency in the operating period, in particular in terms of energy and / or performance. The control and / or regulating unit can preferably specify a reference curve for a frequency spread, in particular with a wavy curve in the middle of the operating period, of the real and / or the complex conductance and change the heating current frequency accordingly in the operating period in order to achieve this reference curve. Preferably has the reference curve in the central region, in particular the central region, of the operating period has a wave-shaped curve around determined values for the real or complex conductance at which the induction target reaches the target heating power. The undulating course is preferably a sinusoidal course. Other reference courses are also conceivable in the central area, in particular the central area, of the operating period, such as a sawtooth course, a rectangular course or a triangular course. It is conceivable that the frequency spread extends over a medium range, in particular a medium range, of 60%, 70% or 90% of the operating period. The complex or real conductance specified by the reference curve preferably deviates from a maximum of 25%, preferably a maximum of 15%, particularly preferably a maximum of 10%, from the determined value for the real or complex conductance at which the induction target reaches the target heating output, in particular which in the other areas of the operating period is kept constant. As a result, an advantageous distribution of the energy and / or power of individual harmonics of the heating current frequency can be achieved. This enables advantageous compliance with the EMC standard to be achieved.

Furthermore, it is proposed that the control and / or regulating unit is provided to control at least one second induction target repetitively and supply it with energy in the continuous heating operating state and to supply the induction target with a heating output, in particular a target heating output, in at least a second switch-on interval of the operating period a power surplus compared to a target heating power. In this way, an advantageous cooking environment can be achieved with several cookware while adhering to the EMC standard.

It is also proposed that the control and / or regulating unit is provided to vary a second heating current frequency for the second induction target in the second switch-on interval of the operating period in the continuous heating operating state. Preferably, the control and / or regulating unit can keep the impedance, the real conductance or the complex conductance of a unit having the second induction target essentially constant by varying the second heating current frequency. Preferably, the control and / or regulating unit can control and / or regulate the operating parameters of the unit having the second induction target analogous to the operating parameters of the unit having the induction target. The control and / or regulating unit can preferably have the operating parameters of each at least one induction target. send unit control and / or regulate analogously to the operating parameters of the unit having the induction target. This allows an advantageous cooking environment to be achieved. As a result, a cooking environment can be achieved which enables advantageous compliance with EMC standards when operating with several cookware.

In addition, it is proposed that the control and / or regulating unit is provided to avoid intermodulation noises of at least two different induction targets in the continuous heating operating state. As a result, an advantageous cooking environment can be achieved, although the heating current frequency is varied for at least two units having at least one induction target.

Furthermore, a cooking appliance, in particular an induction hob, with at least one cooking appliance device is proposed.

The invention is also based on a method for operating a cooking device device, in particular an induction hob device, wherein in at least one periodic permanent heating operating state to which at least one operating period is assigned, at least one induction target is repetitively controlled and supplied with energy and the induction target in at least one switch-on interval the operating period is operated with a heating power, in particular a target heating power or a power surplus compared to a target heating power.

It is proposed that, in the continuous heating operating state, the heating current frequency is varied in the switch-on interval of the operating period. In particular, the heating current frequency is varied in the switch-on interval of the operating period to keep the real and / or the complex conductance of the unit having an induction target constant. In this way, EMC conformity can advantageously be achieved.

Advantageously, the cooking device device can be operated independently of the number of induction targets and independently of the design of the cooking device device, in particular of the built-in components, in order to comply with EMC standards.

The cooking appliance device should not be limited to the application and embodiment described above. In particular, the cooking appliance device can have a number of individual elements, components and units that differs from a number of individual elements, components and units mentioned herein in order to fulfill a functionality described herein. Further advantages emerge from the following description of the drawings. In the drawings, an embodiment of the invention is shown. The drawings, the description and the claims contain numerous features in combination. The specialist will expediently consider the features individually and combine them into meaningful further combinations.

Show it:

Fig. 1 A hob with a cooking device and exemplary set up cooking utensils,

2 shows the cooking appliance device with four induction targets defined by a control and / or regulating unit,

Fig. 3 is a schematic representation of a control for one of the Indukti onsziel,

4 shows an exemplary, schematic representation of the resistance profile and the induction profile of one of the induction targets in an operating period,

5 shows a schematic illustration of a distorted supply current compared to an ideal supply current and a schematic illustration of the distance between the individual harmonics of the supply current and corresponding EMC limit values,

Fig. 6 is a schematic representation of a control with frequency spreading with constant holding of the real conductance for one of the induction targets,

7 shows a schematic representation of a control with frequency spreading and with keeping the real conductance constant for one of the induction targets,

Fig. 8 is a schematic representation of a control with frequency spreading for one of the induction targets, Fig. 9 is a schematic representation of a control at a maximum frequency and a minimum frequency to keep the real conductance constant for one of the induction targets,

Fig. 10 is a schematic representation of a control with frequency spreading with keeping the real conductance constant for one of the induction targets,

11 is a schematic representation of a control with frequency spreading with constant maintenance of the complex conductance for one of the induction targets,

12 shows a schematic representation of a control for a low-noise operation with keeping the real conductance constant for two of the induction targets,

13 shows a schematic representation of a control for a low-noise operation with keeping the real conductance constant for two of the induction targets,

14 shows a schematic representation of a frequency spectrum of EMC emissions with a fixed heating current frequency (a) and with a variable heating current frequency (b) and

15 and a schematic representation of a method for operating the

Cooking device device.

In the figures, only one object of multiple existing objects is sometimes provided with a reference number.

FIG. 1 shows a cooking device 20 designed as a hob 12, in particular as an induction hob, and three set up cooking utensils 14, 14 ', 14 ".

The cooking appliance 20 has a mounting plate 16. The set-up plate 16 is provided for setting up cooking utensils 14, 14 ', 14 ". The mounting plate 16 is designed as a hob plate. In the exemplary embodiment shown, the cooking appliance 20 has four classic cooking zones 18. Alternatively, however, it is also conceivable that the cooking device 20 as a mat rixkochfeld is formed. A cookware 14, 14 ', 14 ″ is arranged on three of the four cooking zones 18.

The cooking device 20 has a cooking device device 10 designed as an induction hob device.

The cooking appliance device 10 has a multiplicity of inductors 22, 22 ", 22", 22 "". FIG. 2 shows an example of a cooking appliance device 10, each with an inductor 22, 22 ", 22", 22 "" per cooking zone 18 or cookware 14, 14 ", 14", 14 "". An inductor 22, 22 ", 22", 22 "" is assigned to exactly one cooking zone 18. It is conceivable that, in the case of a matrix hob, the inductors 22, 22 ", 22", 22 "" are arranged in a matrix-like manner below the mounting plate 16 in order to form a uniform cooking zone 18. It is also conceivable that, in the case of a matrix hob, several inductors 22, 22 ', 22 ", 22"' are arranged in individual areas of the mounting plate 16 in order to form different cooking zones such as fast-cooking zones, with the matrix hob covering the entire surface of the mounting plate 16 can still be used for cooking. In the present example, the cooking appliance device 10 has four inductors 22, 22 ", 22", 22 "".

The inductors 22, 22 ", 22", 22 "" are arranged below the mounting plate 16, in particular within the cooking appliance device 10, in the installed state. The inductors 22, 22 ', 22 ", 22"' are each provided for, in a periodic continuous heating mode 50, a cooking utensil 14, 14 'arranged on the mounting plate 16 above the inductors 22, 22', 22 ", 22" ' , 14 ”, 14” ', in particular inductively, to be heated.

The cooking appliance device 10 has a control panel 24 for an input and / or selection of operating parameters by an operator. For example, an operating parameter can be designed as a target heating output 30, 30 'and / or a cooking time, with the operating parameter being able to be set in particular as a discrete and / or abstract value, for example in quantified intervals or from a pool of an essentially continuous range of values. The control panel 24 is designed as a display 28, in particular a touchscreen display. The control panel 24 is provided for outputting the at least one operating parameter to the operator.

The cooking appliance device 10 has a control and / or regulating unit 26. The control and / or regulating unit 26 is provided as a function of the operating parameters entered by an operator, such as the target heating output 30, 30 'or a cooking time, Execute programs, actions and / or algorithms and / or change settings of the cooking appliance device 10.

Based on the cookware 14, 14 ", 14", 14 "" set up on the mounting plate 16, the control and / or regulating unit 26, in this case for example several, defines induction targets 32, 32 ", 32", 32 "". In Figure 1, two induction targets 32, 32 'are defined by the control and / or regulating unit 26 based on the cooking utensils 14, 14' placed on the mounting plate 16 and the inductors 22, 22 'arranged under the mounting plate 16. In FIG. 2, four induction targets 32, 32 ", 32", 32 "" are defined by the control and / or regulating unit 26. An induction target 32, 32 ", 32", 32 "" has exactly one inductor 22, 22 ", 22", 22 "". An induction target of 32, 32 ", 32", 32 "" has at least one cookware 14, 14 ", 14", 14 "". The control and / or regulating unit 26 can, in particular depending on the design of the hob 12 and the cooking utensils 14, 14 ', 14 ”, 14”' a plurality of induction targets 32, 32 ', 32 ”, 32”' define.

The control and / or regulating unit 26 heats a cookware 14.14 ", 14", 14 "" by applying a heating current frequency 36 to the respective inductor 22, 22 ", 22", 22 "". An output heating output 34 of each induction target 32, 32 ’, 32”, 32 ”’, especially currently achieved, is largely dependent on the heating current frequency 36 applied to the induction target 32, 32 ’, 32”, 32 ”’. In a ZVS mode, the output heating power 34 of an induction target 32, 32 ', 32 ", 32"' increases with a decreasing heating current frequency 36. In a ZCS mode, the output heating power 34 of an induction target 32, 32 ', 32 ", 32"' decreases with it decreasing heating current frequency 36. The control and / or regulating unit 26 operates the cooking appliance device 10, for example in the ZVS mode.

In the continuous heating mode 50, an energy source supplies the induction targets 32, 32 ", 32", 32 "" with electrical energy. The energy source is an electrical current phase of a power supply network. The cooking appliance device 10 has at least one inverter unit 38 for providing at least one heating current frequency 36 for the respective induction target 32, 32 ", 32", 32 "" (see FIG. 2).

FIG. 2 shows the cooking device device 10 with four induction targets 32, 32 ', 32 ", 32"' defined by a control and / or regulating unit 26 of the cooking device device 10. The Garge device device 10 has four resonant inverter units 38. The inverter units 38 provide a heating current frequency 36 for the induction targets 32, 32 ', 32 ", 32"' ready. The inverter units 38 supply the induction targets 32, 32 ', 32 ", 32""with electrical energy independently of one another. One inverter unit 38 is assigned to one of the induction targets 32, 32 ', 32 ", 32"'. Each inverter unit 38 includes, for example, an inverter 64 in FIG. 2.

The control and / or regulating unit 26 is provided in the periodic continuous heating operating state 50, to which an operating period 42 is assigned, for repetitive control and energy supply of the at least one induction target 32, 32 ', in particular from the energy source. The control and / or regulating unit 26 is provided in the permanent heating operating state 50 for periodic control and energy supply of the induction targets 32, 32 '. The control and / or regulating unit 26 is provided in a switch-on interval 40, 40 'of the operating period 42, the induction target 32, 32', 32 ", 32" 'with a heating power, in particular a target heating power 30, 30' or a power excess the target heating power 30, 30 'to operate. The control and / or regulating unit 26 runs through the operating period 42 for at least one induction target 32, 32 ', 32 ”, 32”' repetitively in the continuous heating operating state 50, in particular in the absence of a changed setpoint heating power 30, 30 'set by an operator .

The cooking appliance device 10 has one electromechanical switch element 60 for each induction target 32, 32 ", 32", 32 "". The switch element 60 is formed as a relay 62 from. The induction targets 32, 32 ", 32", 32 "" can be connected to the electrical energy supply through the relays 62. The cooking appliance device 10 has one resonance capacitor unit 44 per induction target 32, 32 ", 32", 32 "". Each induction target 32, 32 ", 32", 32 "" can be individually controlled with a respective heating current frequency 36.

FIG. 3 shows an excerpt from FIG. 2 with schematically marked voltages V and currents i, where the subscript i is used as a placeholder for the respective designations. A rectified supply voltage v _{bus is applied} via the inverter unit 38, in particular via the inverter 64. A voltage v _{0 is applied} across one, in particular each, part 66 of the inverter 64. The voltage VRL is present across the inductor 22, in particular the induction target 32. The voltage vc is applied via one, in particular each, capacitor 68 of the resonance capacitor unit 44. The control and / or regulating unit 26 can measure the voltage vo across a part 66 of the inverter 64, in particular the voltages Vb _US , VRL, VC. The control and / or regulating unit 26 can measure the current strength L. The tax and / or re- Gel unit 26 can store measured values. Over each half of a period of an AC supply voltage, in particular a period of the rectified AC supply voltage, for example 10 ms, the control and / or regulating unit 26 can measure the voltage vo at least ten times, preferably at least twenty times, particularly preferably at least a hundred times. Over each half of a period of an alternating supply voltage, in particular period of the rectified alternating supply voltage, for example 10 ms, the control and / or regulating unit 26 can measure the voltage v ₀ a maximum of seven hundred and fifty times. The control and / or regulating unit 26 can calculate average values over any number N of measured values, in particular for voltages and currents. The control and / or regulating unit 26 can carry out an error calculation for each calculated average value and / or determine whether an average value is within or outside predetermined error tolerances. It is conceivable that the control and / or regulating unit 26, if an average value lies outside the error tolerances, includes further values in the average calculation, in particular until the value complies with the error tolerances. It is conceivable that the control and / or regulating unit 26 includes a lower limit and an upper limit for a number N of values for inclusion in average value calculations in order to determine an average value. It is conceivable that the control and / or regulating unit 26, if the error tolerances for any value, in particular calculated average value, are not reached within the lower and upper limit for the number N of values for calculating the average, rejects this value and for determining the next value advances. The number N is in particular any natural number. In the event of unreliable measurements or calculations, the control and / or regulating unit 26 can suspend the activation, in particular for the heating current frequency 36 of an induction target 32, 32 ′, 32 ″, 32 ″, in particular temporarily. The unit 80 having the induction target 32, 32 ', 32 ", 32"' comprises at least one induction target 32, 32 ', 32 ", 32"' and in each case at least one capacitor 68 of the resonance capacitor unit 44, which in particular is in series with the Induction target 32, 32 ', 32 ", 32"' is switched.

FIG. 4a shows the profile of the rectified voltage V _bUS over a period, in particular 10 ms. The time in milliseconds is plotted on an abscissa 88. The rectified voltage V _{bUS is plotted} in volts on an ordinate 90. _Figures 4b and 4c show how within the period of the rectified voltage V _bUS the resistance, which is plotted in particular on an ordinate 92, see FIG. 4b) and the inductance, which is in particular plotted on an ordinate 94 (see FIG. 4c) of the activated induction target 32, 32 ', 32 ", 32'" or a The induction target 32, 32 ', 32 ”, 32”' comprising unit 80, in particular as a function of the signal level of the rectified voltage, change over time, with the time in milliseconds being plotted in particular on the abscissa 88. In particular, with a change in the inductance, an impedance, in particular a complex conductance, of the induction target 32, 32 ', 32 ”, 32”' within the period of the rectified voltage v _bU s also changes with a change in the resistance real conductance of the induction target 32, 32 ', 32 ", 32"' within the period of the rectified voltage V _bUS . The control and / or regulating unit 26 is provided to vary a heating current frequency 36 for the induction target 32, 32 ', 32 ”, 32”' in the switch-on interval 40, 40 'of the operating period 42 in the continuous heating operating state 50. The control and / or regulating unit 26 can vary the heating current frequency 36 in the continuous heating operating state 50, in particular to keep the impedance and / or the real conductance and / or the complex conductance of the induction target 32, 32 ', 32 ”, 32” constant. 'having unit 80. The control and / or regulating unit 26 is provided in the continuous heating operating state 50 at least one impedance of at least one unit 80 having the induction target 32, 32', 32 ", 32"'within the switch-on interval 40, 40' to keep at least essentially constant. The control and / or regulating unit 26 is provided to continuously change the heating current frequency 36 in the switch-on interval 40, 40 ′ in the continuous heating operating state 50. In particular, the control and / or regulating unit 26 changes the heating current frequency 36 at least ten times in an operating period 42.

FIG. 5 shows a distorted alternating supply current when operating an induction target 32, 32 ', 32 ", 32"' with a constant heating current frequency 36 in the permanent heating operating state 50. In FIG. 5a, the time in milliseconds is plotted on the abscissa 88. In FIG. 5a, the current intensity in amperes is plotted on an ordinate 96. FIG. 5 also shows that individual harmonics 78 (harmonics) have a greater amplitude than other harmonics 78, in particular due to the dependence of the waveform of the supply current on the signal level, in particular amplitude, and temperature. As a result, individual harmonics 78, in this example the third harmonic 78, cannot meet the EMC standards. In particular, Figure 5a shows an example play how the alternating supply current is distorted due to the dependence of the impedance of the unit 80 having the induction target 32, 32 ', 32 ", 32'" on the signal level of the alternating supply voltage. In Figure 5b, the supply alternating current is broken down into its ne, in particular the first forty from the second, harmonic 78, alternatively also called harmonics, with each harmonic 78 having a certain current strength and for each harmonic 78 one, in particular determined by EMC standards , Current limit applies. In FIG. 5b, the order of the harmonics is plotted without units on an abscissa 98. In FIG. 5b, the current intensity, in particular the difference in current intensity, is plotted in amperes on the ordinate 96. In FIG. 5b, in particular, the differences in the current intensities of the individual harmonics 78 from the second order onwards are plotted against their limits, a positive difference meaning that the limit is not adhered to. It is shown by way of example that the third harmonic 78, for example of 2.77 A, is above its limit, the limit being in particular 2.3 A, and the EMC standards are not met. In this example, the induction target 32, 32 ', 32 ", 32"' is controlled and operated with a constant heating current frequency 36 of 60 kHz.

FIG. 6 schematically shows a course of a control for an induction target 32, 32 ', 32 ", 32"' by the control and / or regulating unit 26. The control and / or regulating unit 26 is provided for at least the real guide value, at least of the unit 80 having the induction target 32, 32 ', 32 ”, 32”' within the switch-on interval 40, 40 ', in particular essentially, to keep constant. The control and / or regulating unit 26 keeps at least the real conductance value of the unit 80 having the induction target 32, 32 ′, 32 ″, 32 ″ ′ essentially constant within the switch-on interval 40, 40 ′ in the continuous heating operating state 50. FIG. 6a shows the course of the real conductance G of the unit 80 having the induction target 32, 32 ', 32 ", 32"' in the operating period 42, for example 10 ms, corresponding to half a period of the AC supply voltage. In FIG. 6a, the time in milliseconds is plotted on the abscissa 88. In FIG. 6a, the real conductance in (mO ¹ ), in particular milliohm ^{· 1} , is plotted on an ordinate 100. FIG. 6b shows the course of the heating current frequency 36, which is required to keep the real conductance G constant and is implemented by the control and / or regulating unit 26, in the same operating period 42. In FIG. 6b, the time in milliseconds is plotted on the abscissa 88. In FIG. 6b, the frequency in kHz is plotted on an ordinate 102. In particular, the tax and / or control unit 26, the heating current frequency 36, in particular of the induction target 32, 32 ', 32 ", 32'", in particular at least five times per millisecond. It is shown that the control and / or regulating unit 26 can control the heating current frequency 36 temporarily without any changes. The control and / or regulating unit 26 controls and / or regulates the heating current frequency 36 to a constant value in the first and last approximately 0.2 milliseconds of the operating period 42. In particular, the control and / or regulating unit 26 can determine measurement data outside of error tolerances and therefore avoid an adaptation of the heating current frequency 36.

Figure 6c shows the course of the squared rectified AC supply voltage V _bus in the operating period 42. In Figure 6c on the abscissa 88, the time is plotted in milliseconds. In FIG. 6c, the squared voltage in mV ² , in particular millivolt ² , is plotted on an ordinate 104. FIG. 6d shows the course of the achieved, in particular required, heating power by the unit 80 having the induction target 32, 32 ', 32 ", 32"', in particular by the induction target 32, 32 ', 32 ", 32"' in FIG of the operating period 42. In FIG. 6d, the time in milliseconds is plotted on the abscissa 88. In FIG. 6d, the power in W, in particular watts, is plotted on an ordinate 106. In Figure 6e, the curves of Figures 6c and 6d are normalized and shown superimposed. In the ideal case of a constant real conductance, the power is proportional to the square of the voltage and both curves shown in FIG. 6e should coincide exactly (see the following equation).

P = U ² - G, where P is a power, U is a voltage and G is the real conductance. In FIG. 6e, the time in milliseconds is plotted on the abscissa 88. In FIG. 6e, a standardization variable without a unit is plotted on an ordinate 108. FIG. 6e shows that the control and / or regulating unit 26 uses the real conductance to match the curves of the squared rectified AC supply voltage v _bus and the power generated via the unit 80 having the induction target 32, 32 ', 32 ", 32"', in particular heating output, controls and / or regulates. The control and / or regulating unit 26 reduces the distortion of the supply current by keeping the real conductance constant of the unit 80 having the induction target 32, 32 ', 32 ", 32"'. The control and / or regulating unit 26 achieves compliance with EMC standards by keeping the real conductance constant, in particular the real conductance of the induction target 32, 32 ', 32 ”, 32” 'having unit 80. In particular, the value of the complex conductance value, at which the complex conductance value is kept constant by the control and / or regulating unit 26 in the operating period 42, supplies the setpoint heating output 30, 30', which in particular is desired by an operator.

FIG. 7 schematically shows a course of a control for an induction target 32, 32 ', 32 ", 32"' by the control and / or regulating unit 26. In FIGS. 7a to 7e, the time in milliseconds is plotted on the abscissa 88. In FIG. 7a, the real conductance in (mQ ^{· 1} ), in particular milliohm ^{· 1} , is plotted on the ordinate 100. In FIG. 7b, the frequency in kHz is plotted on ordinate 102. In FIG. 7c, the squared voltage in mV ² , in particular millivolt ² , is plotted on ordinate 104. In FIG. 7d, the power in W, in particular watts, is plotted on ordinate 106. In FIG. 7e, a standardization variable without a unit is plotted on ordinate 108.

The control and / or regulating unit 26 is provided in the permanent heating mode 50 at least the real conductance (G), at least of the unit 80 having the induction target 32, 32 ', 32 ", 32"' within the switch-on interval 40, 40 ' , in particular, to keep it essentially constant. The control and / or regulating unit 26 keeps at least the real conductance of the unit 80 having the induction target 32, 32 ', 32 ", 32"' within the switch-on interval 40, 40 'essentially constant in the continuous heating mode 50. FIG. 7a shows the course of the real conductance G of the unit 80 having the induction target 32, 32 ', 32 ", 32"' in the operating period 42, for example 10 ms, corresponding to half a period of the AC supply voltage. In FIG. 7b, the curve of the heating current frequency 36, which is required to keep the real conductance G constant and is implemented by the control and / or regulating unit 26, in the same operating period 42 is shown. In particular, the control and / or regulating unit 26 changes the heating current frequency 36, in particular of the induction target 32, 32 ', 32 ", 32"' at least ten times per millisecond. It is shown that the control and / or regulating unit 26 can control the heating current frequency 36 temporarily without any changes. The control and / or regulating unit 26 controls and / or regulates the heating current frequency 36 to different values in the first and last approximately 0.2 milliseconds of the operating period 42. In particular, the control and / or regulating unit 26 can determine measurement data within error tolerances and therefore control and / or regulate an adaptation of the heating current frequency 36. FIG. 7c shows the course of the squared rectified AC supply voltage V _bus in the operating period 42. FIG. 7d shows the course of the heating power achieved, in particular consumed, by the unit 80 having the induction target 32, 32 ', 32 ", 32"", in particular through the induction target 32, 32 ', 32 ”, 32”', in the operating period 42. In FIG. 7e, the curves of FIGS. 7c and 7d are shown normalized and superimposed. FIG. 7e shows that the control and / or regulating unit 26 determines the real conductance for an overlap of the curves of the squared rectified AC supply voltage v _bus and the power generated via the unit 80 having the induction target 32, 32 ', 32 ", 32"' , in particular heating power, controls and / or regulates. The control and / or regulating unit 26 reduces the distortion of the supply current by keeping the real conductance value of the unit 80 having the induction target 32, 32 ', 32 ", 32"' constant. The control and / or regulating unit 26 achieves compliance with EMC standards by keeping the real guide value constant, in particular the real guide value of the unit 80 having the induction target 32, 32 ', 32 ", 32"'. In particular, the value delivers of the complex conductance, at which the complex conductance is kept constant by the control and / or regulating unit 26 in the operating period 42, the setpoint heating power 30, 30 ', which is particularly desired by an operator.

FIG. 8 schematically shows a course of an activation for an induction target 32, 32 ', 32 ", 32"' by the control and / or regulating unit 26. The control and / or regulating unit 26 is provided for at least the complex conductance, at least of the unit 80 having the induction target 32, 32 ', 32 ", 32"' within the switch-on interval 40, 40 ', in particular essentially, to keep constant. In FIGS. 8a to 8e, the time in milliseconds is plotted on the abscissa 88. In FIG. 8a, the complex conductance in (mQ ^{* 1} ), in particular milli ohms ^{* 1} , is plotted on an ordinate 110. In FIG. 8b, the frequency in kHz is plotted on the ordinate 102. In FIG. 8c, the voltage in V, in particular volts, is plotted on ordinate 112. In FIG. 8d, the current strength in A, in particular amps, is plotted on ordinate 114. In FIG. 8e, a standardization variable without units is plotted on ordinate 108.

The control and / or regulating unit 26 holds, in the continuous heating operating state 50, the complex conductance of a unit 80 having the induction target 32, 32 ', 32 ”, 32”' within. half of the switch-on interval 40, 40 'essentially constant (see FIG. 8a). FIG. 8a shows the course of the complex conductance Y of the unit 80 facing the induction target 32, 32 ', 32 ", 32"' in the operating period 42, for example 10 ms, corresponding to half a period of the AC supply voltage.

FIG. 8b shows the course of the heating current frequency 36, which is required to keep the complex conductance Y constant and is implemented by the control and / or regulating unit 26, in the same operating period 42. In particular, the control and / or regulating unit 26 changes the heating current frequency 36, in particular of the induction target 32, 32 ", 32", 32 "" at least five times per millisecond. It is shown that the control and / or regulating unit 26 can control the heating current frequency 36 temporarily without any changes. The control and / or regulating unit 26 controls and / or regulates the heating current frequency 36 to different values in the first and last approximately 0.2 milliseconds of the operating period 42. In particular, the control and / or regulating unit 26 can avoid measurement data outside of error tolerances and adjust the heating current frequency 36.

FIG. 8c shows the course of the rectified _AC supply voltage V _bUS in the quadratic mean in the operating period 42. FIG. 8d shows the course of the applied, in particular consumed, heating current in the quadratic mean through the induction target 32, 32 ', 32 ", 32"' Unit 80, in particular through the induction target 32, 32 ', 32 ", 32"', in the operating period 42. In FIG. 8e, the curves of the parameters from FIGS. 8c and 8d are shown normalized and superimposed.

FIG. 8e shows that the control and / or regulating unit 26 uses the real conductance to match the curves of the rectified AC supply voltage v _bus squared in the square mean and the unit 80 having the induction target 32, 32 ', 32 ", 32"' applied current intensity i _L , in particular the heating current, controls and / or regulates. The control and / or regulating unit 26 reduces the distortion of the supply current by keeping the complex conductance constant of the unit 80 having the induction target 32, 32 ', 32 ", 32"'. The control and / or regulating unit 26 achieves compliance with EMC standards by keeping the complex conductance constant, in particular the real conductance of the unit 80 having the induction target 32, 32 ', 32 ”, 32”'. In particular, the value of the complex conductance, on which the complex conductance by the control and / or regulating unit 26 in the operating The nominal heating power 30, 30 ′, which is particularly desired by an operator, is kept constant during period 42.

FIG. 9 schematically shows a course of a control for an induction target 32, 32 ', 32 ", 32"' by the control and / or regulating unit 26. In FIGS. 9a to 9d, the time in milliseconds is plotted on the abscissa 88. In FIGS ^. 9a and 9c, the real conductance in (mQ ^{* 1} ), in particular milliohm ^{* 1} , is plotted on the ordinate 100. In FIGS. 9b and 9d, the frequency in kHz is plotted on the ordinate 102. The 26 is provided to keep at least the real conductance, at least of the unit 80 having the induction target 32, 32 ', 32 ”, 32”', within the switch-on interval 40, 40 ', in particular essentially constant, in the continuous heating operating state 50. In particular, the control and / or regulating unit 26 changes the heating current frequency 36 of the induction target 32, 32 ', 32 ", 32"'. The control and / or regulating unit 26 varies the heating current frequency 36 of the induction target 32, 32 ', 32 ", 32"' within a maximum frequency 82 and minimum frequency 84 that are permissible due to technical restrictions. FIG. 9a shows a curve of the real conductance of the induction target 32 , 32 ', 32 ", 32"' having unit 80 in the switch-on interval 40, 40 ', in particular an operating period 42. FIG. 4b shows the profile of the heating current frequency 36 that matches FIG. 4a. The control and / or regulating unit 26 changes the Heating current frequency 36 within the permissible frequency limits, such as maximum frequency 82 and minimum frequency 84. The control and / or regulating unit 26 controls and / or regulates the real conductance due to a necessary change in heating current frequency 36 beyond maximum frequency 82 in the time interval of 0 to 2.5 ms and from 7.5 ms to 10 ms of the operating period 42 to a constant value, in particular to the maximum frequency 82 (see FIGS. 4a and 4b ).

FIG. 9c shows a course of the real conductance of a unit 80 having the induction target 32, 32 ', 32 ", 32"' in the switch-on interval 40, 40 ', in particular an operating period 42. FIG. 4d shows the course of the heating current frequency matching FIG. 4c 36. The control and / or regulating unit 26 controls and / or regulates the real conductance due to a necessary change in the heating current frequency 36 below the minimum frequency 84 in the time interval from 0 to 2.5 ms and from 7.5 ms to 10 ms of the operating period 42 to a constant value, in particular the minimum frequency 84 (see FIGS. 4c and 4d). FIG. 10 schematically shows a course of a control for an induction target 32, 32 ', 32 ", 32'" by the control and / or regulating unit 26 as in FIG. 7 with an additional frequency spread 74. In FIGS. 10a to 10d, FIG Abscissa 88 plotted the time in milliseconds. In FIG. 10a, the real conductance in (mQ ^{· 1} ), in particular milliohm ^{· 1} , is plotted on ordinate 100. In FIG. 10b, the frequency in kHz is plotted on ordinate 102. In FIG. 10c, the squared voltage in mV ² , in particular millivolt ² , is plotted on ordinate 104. In FIG. 10d, the power in W, in particular watts, is plotted on the ordinate 106. In FIG. 10e, a normalization variable without units is plotted on the ordinate 108.

The control and / or regulating unit 26 is provided for a frequency spread 74 using a reference curve 70 of the real master value of the unit 80 having the induction target 32, 32 ', 32 ”, 32”' to at least one harmonic 78 in the permanent heating mode 50 , in particular at least one of the heating current frequencies 36 to be used. The control and / or regulating unit 26 is provided in the continuous heating operating state 50, the real conductance that the induction target 32, 32 ', 32 ", 32"' have within the unit 80 within the switch-on interval 40, 40 ', in particular essentially to keep constant. The control and / or regulating unit 26 exerts a frequency spread 74 in a central region 72 of the operating period 42, in particular from 3 ms to 7 ms, by means of a corrugated reference curve 70 for the real conductance on the heating current frequency 36. The reference curve 70 for achieving a frequency spread 74 has a sinusoidal curve. The reference curve 70 is constant outside the central region 72; in particular, the reference curve 70 outside the central region 72 corresponds to a function that is constant over time. The reference curve 70 is, in particular over the entire operating period 42, in particular at least over the switch-on intervals 40, 40 'of an operating period 42, centered around the value of the real conductance at which the induction target 32, 32', 32 ", 32"'is the target heating output 30, 30 'scored. On average, the control and / or regulating unit 26 achieves in the induction target 32, 32 ′, 32 ″, 32 ″ ′ over the duration of the frequency spread 74, for example in the central area 72, in particular also over the duration of the operating period 42 with a frequency spread 74 , the target heating power 30, 30 ', in particular the heating current frequency 36, which the control and / or Re gel unit 26 keeps constant over the remainder of the operating period 42. The control and / or regulating unit 26 maintains, in the continuous heating operating state 50, at least the real conductance value of the unit 80 having the induction target 32, 32 ', 32 ”, 32”' within the switch-on Interval 40, 40 'outside of central region 72 is essentially constant. FIG. 10a shows the course of the real conductance G that the induction target 32, 32 ', 32 ", 32"' have in the unit 80 in the operating period 42, for example 10 ms, corresponding to half a period of the AC supply voltage. FIG. 10b shows the course of the heating current frequency 36, which is required to keep the real conductance G constant and is implemented by the control and / or regulating unit 26, in the same operating period 42. In particular, the control and / or regulating unit 26 changes the heating current frequency 36, in particular of the induction target 32, 32 ', 32 ", 32"' at least five times per millisecond. In particular, the control and / or regulating unit 26 controls and / or regulates the heating current frequency 36 outside the central area 72 of the switch-on interval 40, 40 ′ in order to achieve a constant real conductance. In particular, the constant real conductance outside the central area 72 is specified by means of a constant reference curve 70. In particular, the switch-on interval 40, 40 'has two ranges from 0 ms to 3 ms and from 7 ms to 10 ms, outside the central range 72 from 3 ms to 7 ms. In particular, the control and / or regulating unit 26 controls and / or regulates the heating current frequency 36 over 6 ms to achieve a constant real conductance and over 4 ms to a sine curve of the real conductance. FIG. 10c shows the course of the squared rectified _AC supply voltage V _bUS in the operating period 42. FIG. 10d shows the course of the heating power achieved, in particular consumed, by the unit 80 _{having the induction target} 32, 32 ', 32 ", 32"', in particular by the Induction target 32, 32 ', 32 ", 32"', in the operating period 42. In FIG. 10e, the curves of FIGS. 10c and 10d are shown normalized and superimposed. FIG. 10e shows that the control and / or regulating unit 26 uses the real conductance, in particular the heating current frequency 36, to overlap the curves of the squared rectified AC supply voltage v _bus and the over which the induction target 32, 32 ', 32 ", 32"'having unit 80 resulting power, in particular heating power, controls and / or regulates. The control and / or regulating unit 26 reduces the distortion of the supply current by keeping the real conductance constant of the unit 80 having the induction target 32, 32 ', 32 ", 32"'. The control and / or regulating unit 26 also achieves compliance with EMC standards for critical heating current frequencies 36 (see FIG. 14) through the frequency spread 74 by keeping the real conductance constant, in particular the real conductance of the induction target 32, 32 ', 32 ", 32"'having unit 80. In particular, the value of the complex conductance supplies, on which chem the complex conductance by the control and / or regulating unit 26 in the operating The nominal heating power 30, 30 ′, which is particularly desired by an operator, is kept constant during period 42. It is conceivable that the control and / or regulating unit 26 extends the area of the operating period 42 with a frequency spread 74 through a wavy reference curve 70 over the entire operating period 42. It is also conceivable that the control and / or regulating unit 26 has at least two areas with a frequency spread 74 distributed in the operating period 42.

FIG. 11 schematically shows a course of a control for an induction target 32, 32 ', 32 ", 32"' by the control and / or regulating unit 26 as in FIG. 8 with an additional frequency spread 74 analogous to the combination shown in FIG is described, the control and / or regulating unit 26 controlling the frequency spread 74 by means of reference curve 70 for the complex conductance. In FIGS. 11 a to 11 d, the time in milliseconds is plotted on the abscissa 88. In FIG. 11 a, the complex conductance in (mQ ^{· 1} ), in particular milliohm ^{· 1} , is plotted on the ordinate 110. In FIG. 11 b, the frequency in kHz is plotted on ordinate 102. In FIG. 1 1c, the voltage in V, in particular volts, is plotted on the ordinate 1 12. In Figure 1 1 d, the current strength in A, in particular amps, is plotted on the ordinate 114. In FIG. 11 e, a standardization variable without a unit is plotted on the ordinate 108.

In particular, the control and / or regulating unit 26 is provided in the continuous heating operating state 50, a frequency spread 74 using a reference curve 70 of the complex conductance of at least one unit 80 having the induction target 32, 32 ', 32 ”, 32”' to at least one harmonic 78, in particular at least one of the heating current frequencies 36 to apply. The control and / or regulating unit 26 achieves the frequency spread 74 by means of a reference curve 70 analogous to the example from FIG. 10, the reference curve 70 applying to the complex conductance. It is conceivable that the control and / or regulating unit 26 is provided in the continuous heating mode 50 to control and / or regulate the heating current frequency 36 around a target frequency, in particular on the basis of a reference curve 70 with tolerances, in particular over the duration of the operating period 42 to achieve the target heating power 30, 30 'in the induction target 32, 32', 32 ", 32" '.

FIG. 12 schematically shows a course of a noise-free control for two units 80 having an induction target 32, 32 ', 32 ", 32"' by the control and / or regulating unit 26. In FIGS. 12a to 12d, on the abscissa 88 is Time in milliseconds applied. In FIG. 12a, the real conductance value in (mQ ^{· 1} ), in particular milliohm ^{· 1} , is plotted on ordinate 100. In FIG. 12b, the frequency in kHz is plotted on ordinate 102. In FIG. 12c, the squared voltage in mV ² , in particular millivolts ² , is plotted on ordinate 104. In FIG. 12d, the power in W, in particular watts, is plotted on the ordinate 106. In FIG. 12e, a standardization variable without a unit is plotted on the ordinate 108.

In the example shown, the operating period 42 corresponds to a large number, in particular ten, of half the period duration of the AC supply voltage, in particular the period duration of the rectified AC supply current. The operating period 42 has a duration of 10 ms, for example. In FIG. 12a, the respective curves of the real conductance for each of the two units 80 having an induction target 32, 32 ', 32 ", 32'" and the sum of the real conductance of both an induction target 32, 32 ', 32 ", 32"' having units 80 shown in an operating period 42, in particular for an operating period 42.

The control and / or regulating unit 26 is provided to repeatedly control and supply at least one second induction target 32, 32 ', 32 ", 32"' and to supply the induction target 32, 32 ', 32 ", 32 '' 'in at least one second switch-on interval 86, 86' of the operating period 42 with a heating power, in particular a target heating power 30, 30 'or a power excess compared to a target heating power 30, 30'. The control and / or regulating unit 26 is intended to add a second heating current frequency 36 'for the second induction target 32, 32', 32 ", 32" 'in the second switch-on interval 86, 86' of the operating period 42 in the continuous heating operating state 50 vary. The control and / or regulating unit 26 is provided to avoid intermodulation noises from at least two different induction targets 32, 32 ", 32", 32 "" in the continuous heating mode 50.

FIG. 12b shows the respective courses of the heating current frequencies 36 controlled by the control and / or regulating unit 26 at the units 80 having an induction target 32, 32 ″, 32 ″, 32 ″, in particular for an operating period 42.

FIG. 12c shows the respective curves of the squared rectified _AC supply voltage V _bUS at the one controlled by the control and / or regulating unit 26 Units 80 having induction target 32, 32 ′, 32 ″, 32 ″ ″ are shown, in particular for an operating period 42.

FIG. 12d shows the respective courses of the achieved, in particular consumed, heating powers controlled by the control and / or regulating unit 26 at the units 80 having an induction target 32, 32 ', 32 ", 32"', as well as the course of the sum of the Heating output, especially for an operating period 42.

In FIG. 12e, the respective courses of FIGS. 12c and 12d controlled by the control and / or regulating unit 26 are shown normalized and superimposed. FIG. 12e shows that the control and / or regulating unit 26 uses the sum of the real conductance of the controlled units 80 having an induction target 32, 32 ', 32 ", 32"' to match the curves of the squared rectified AC supply voltage V _bus and controls and / or regulates the sum of the power, in particular heating power, occurring over the units 80 having the induction target 32, 32 ', 32 ", 32"'.

The control and / or regulating unit 26 reduces the distortion of the supply current by keeping the sum of the real conductance constant of the units 80 having the induction target 32, 32 ", 32", 32 "". The control and / or regulating unit 26 achieves compliance with EMC standards by keeping the sum of the real conductance constant, in particular the real conductance of the units 80 having the induction target 32, 32 ', 32 ”, 32”' the curves of the real conductance value for each of the unit 80 having an induction target 32, 32 ', 32 ", 32"', the target heating power 30, 30 ', which is particularly desired by an operator.

The control and / or regulating unit 26 can control with keeping the real and / or complex conductance values constant in the switch-on interval 40, 40 'of the operating period 42 for a unit 80 having an induction target 32, 32', 32 ", 32" 'for multiple units 80 having an induction target 32, 32 ', 32 ”, 32”'.

The following shows, by way of example, the mathematical relationships between the activation by the control and / or regulating unit 26 for several units 80 having an induction target 32, 32 ', 32 ”, 32”'. To achieve compliance with EMC standards, the control and / or regulating unit 26 can keep the sum of the real conductance of all units 80 having an induction target 32, 32 ′, 32 ″, 32 ″ essentially constant. The sum of the real conductance of all induction target 32, 32 ', 32 ", 32"' units 80 is described by the following equation. The control and / or regulating unit 26 can also use the following equation to calculate the sum of the real conductance values which each belong to a target frequency, in particular setpoint heating power 30, 30 '. where XG stands for the sum of the real master values. Since all units 80 _having an induction target 32, 32 ', 32 ", 32"' share the same voltage, in particular v _{1 rms} = v _2, rm _s ', the control and / or regulating unit 26 can directly calculate the sum of the real conductance values and keep constant over variations of the heating current frequencies 36 over each switch-on interval 40, 40 ′ of each operating period 42. In particular, the control and / or regulating unit 26 can calculate the sum of the real conductance values via variations in the heating current frequencies 36 of each activated unit 80 having an induction target 32, 32 ', 32 ”, 32”' over each switch-on interval 40, 40 ' Keep the operating period 42, in particular the entire operating period 42, in particular half the period duration of the AC supply voltage, essentially constant. In particular, in order to keep the sum of all real conductance values constant, the control and / or regulating unit 26 can individually control each unit 80 having an induction target 32, 32 ', 32 ”, 32”' analogous to the control for only one induction target 32, 32 ', Unit 80 having 32 ”, 32” '.

To control several units 80 having an induction target 32, 32 ", 32", 32 "", the control and / or regulating unit 26 calculates a linear system of equations, which is described mathematically below

where G is the matrix of the real conductance values, x is a vector with the switch-on times t, and g is a vector with the real conductance values G _{ti of} the units 80 having an induction target 32, 32 ', 32 ", 32'" corresponding to the target heating powers.

The columns of the matrix G are the real conductance values for a noiseless modulation for the various induction targets 32, 32 ', 32 ", 32"', in particular the units 80 having an induction target 32, 32 ', 32 ", 32"' at each switch-on interval 40, 40 '. The rows of the matrix G are the real conductance values for one induction target 32, 32 ', 32 ", 32"', in particular a unit 80 having an induction target 32, 32 ', 32 ", 32"' in each switch-on interval 40, 40 '.

The control and / or regulating unit 26 is provided to form at least two time intervals, in particular switch-on intervals 40, 40 'in an operating period 42 when operating several induction targets 32, 32', 32 ', 32' '.

The control and / or regulating unit 26 is provided for this purpose in a switch-on interval 40, 40 'in an operating period 42 each with an induction target 32, 32', 32 ", 32 '" with an excess power and another induction target 32, 32' , 32 ", 32 '" with a power deficit compared to a target heating power of 30, 30'. The control and / or regulating unit 26 is provided for this purpose in a switch-on interval 40, 40 'in an operating period 42 with one induction target 32, 32', 32 ", 32 '" with a larger real and / or complex conductance and another induction target 32, 32 ', 32 ", 32'" with a smaller real and / or complex conductance compared to a real and / or complex conductance corresponding to a target heating power 30, 30 '.

The control and / or regulating unit 26 is provided for this purpose in a further switch-on interval 40, 40 'in an operating period 42 each one induction target 32, 32', 32 ", 32 '" with a power deficit and the other induction target 32, 32' , 32 ", 32 '" to operate with a power surplus compared to a target heating power of 30, 30'.

For the individual switch-on times 40, 40 'of an operating period 42, the restrictions apply that the sum of all switch-on intervals 40, 40' of an operating period 42 can be at most the same length as the operating period 42 itself, with each switch-on interval 40, 40 'being greater than / equal to must be zero. The control and / or regulating unit 26 varies the heating current frequencies 36 at each unit 80 having an induction target 32, 32 ', 32 ", 32"' for the noiseless activation of a plurality of units 80 having an induction target 32, 32 ', 32 ", 32"" to a difference 48 of at least 20 kHz, preferably at least 16 kHz, or to a vanishingly small difference 48. FIG. 12 shows that an operating period 42 comprises 100 ms. For example, an operating period 42 comprises five periods of the alternating supply voltage, in particular ten halves of the period of the alternating supply voltage.

The control and / or regulating unit 26 keeps the sum of the respective real and / or complex conductance values, in particular target conductance values, of the units 80 having an induction target of 32, 32 ", 32", 32 "" constant in each switch-on interval 40, 40 ". A real and / or complex setpoint conductance corresponds to the conductance that corresponds to a setpoint heating power 30, 30 'of the unit 80 having an induction target of 32, 32', 32 ', 32' '. The control and / or regulating unit 26 varies the heating current frequency 36 at the units 80 having an induction target 32, 32 ', 32 ", 32"' in each switch-on interval 40, 40 'in order to keep the sum of all real conductance values of the operated induction target 32 constant , 32 ', 32 ", 32"' units 80, for example for two units 80 having an induction target 32, 32 ', 32 ", 32"' (FIGS. 12a and 12b).

The operating period 42 has two different switch-on intervals 40, 40 ', for example. The first switch-on interval 40, 40 'goes from 0 ms to 40 ms of the operating period 42 of a total of 100 ms. The second switch-on interval 40, 40 'goes from 40 ms to 100 ms of the operating period 42 of a total of 100 ms.

In this example, in the first switch-on interval 40, 40 'from 0 ms to 40 ms of the operating period 42 of a total of 100 ms (see FIG. 12a), the real conductance Gn is an induction target 32, 32', 32 ", 32"' having unit 80 about 185 mQ ¹ . In this example, the real conductance G21 of another induction target 32, 32 ', 32 ”, 32 is in the first switch-on interval 40, 40' from 0 ms to 40 ms of the operating period 42 of a total of 100 ms (see FIG. 12a) ”'Having unit 80 about 45 mQ ¹ .

In this example, in the second switch-on interval 86, 86 'from 40 ms to 100 ms of the operating period 42 of a total of 100 ms (cf. FIG. 12a), the real conductance G12 is that of an induction target 32, 32', 32 ", 32"' Unit 80 about 80 mQ ¹ . In this example is in the first switch-on interval 40, 40 'from 40 ms to 100 ms of the operating period 42 of a total of 100 ms (cf. FIG. 12a), the real conductance G22 of a further unit having an induction target 32, 32', 32 ", 32"' 80 about 150 mQ ¹ .

The control and / or regulating unit 26 keeps the sum of the two conductance values of approximately 230 mQ ^{· 1} constant over the entire operating period 42, in particular over each switch-on interval 40, 40 '.

The control and / or regulating unit 26 can determine a corresponding heating current frequency 36 and the matching real conductance values from the target heating output 30, 30 ’for both units 80 having an induction target 32, 32’, 32 ”, 32” ’. The control and / or regulating unit 26 can determine a switch-on interval distribution in the operating period 42 from the real conductance values.

The average conductance to be achieved over the operating period 42 in this example is about 122 mQ ¹ for the one unit 80 having an induction target 32, 32 ', 32 ”, 32”' and about 108 mQ ^_1 for the other one induction target 32, 32 ' Unit 80 having, 32 ”, 32” '.

The control and / or regulating unit 26 controls the heating current frequencies 36 of the units 80 having an induction target 32, 32 ', 32 ”, 32”' to a difference 48 of at least 20 kHz, in particular at least 16 kHz, in this example a difference 48 of about 30 kHz in the first switch-on interval 40, 40 '.

The control and / or regulating unit 26 controls the heating current frequencies 36 of the units 80 having an induction target 32, 32 ', 32 ”, 32”' with a difference 48 of 0 kHz, in particular with the same profile, in the second switch-on interval 86 , 86 'of the operating period 42.

The control and / or regulating unit 26 can perform a variation of the heating current frequencies 36 in order to keep constant the sum of all real conductance values of the units 80 having an induction target 32, 32 ′, 32 ″, 32 ″ ′. When varying at least two simultaneously controlled heating current frequencies 36 to keep the sum of all real conductance values of the units 80 having an induction target 32, 32 ', 32'',32''' having a difference 48 of heating current frequencies 36 from being varied, the control and / or regulating unit 26 below 16 kHz, especially below 20 kHz. It is conceivable that the control and / or regulating unit 26 would have to correct a heating current frequency 36 more strongly than another for the best possible constant keeping, the control and / or regulating unit 26 checking whether a difference 48 of at least 16 kHz, in particular at least 20 kHz is preserved.

The control and / or regulating unit 26 achieves compliance with EMC standards in the low-noise operation of several, in particular two, induction targets 32, 32 ", 32", 32 "".

FIG. 13 schematically shows another example of a course of a noise-free activation for two units 80 having an induction target 32, 32 ', 32 ", 32"' by the control and / or regulating unit 26. In this example, the operating period 42 is the same long as half the period of the AC supply voltage. In FIGS. 13a to 13d, the time in milliseconds is plotted on the abscissa 88. In FIG. 13a, the real conductance in (mQ ^{· 1} ), in particular milliohm ^{· 1} , is plotted on ordinate 100. In FIG. 13b, the frequency in kHz is plotted on ordinate 102. In FIG. 13c, the squared voltage in mV ² , in particular millivolt ² , is plotted on ordinate 104. In FIG. 13d, the power in W, in particular watts, is plotted on the ordinate 106. In FIG. 13e, a standardization variable without a unit is plotted on the ordinate 108.

The operating period 42 has nine switch-on intervals 40, 40 '. In four of the nine switch-on intervals 40, 40 ', the control and / or regulating unit 26 controls the heating current frequencies 36 of the two units 80 having an induction target 32, 32', 32 ", 32" 'to a difference 48 of at least 20 kHz, in particular at least 16 kHz. In the other five of the nine switch-on intervals 40, 40 ', the control and / or regulating unit 26 controls the heating current frequencies 36 of the two units 80 having an induction target 32, 32', 32 ", 32" 'to a difference 48 of 0 kHz . In particular, the control and / or regulating unit 26 avoids intermodulation noises between the units 80 having an induction target 32, 32 ', 32 ", 32"'. The control and / or regulating unit 26 keeps the sum of the real conductance values of an induction target 32, 32 Units 80 having ', 32', 32 '' 'remain constant over the entire operating period 42, analogously to the example of FIG.

FIG. 14 shows a frequency spectrum of an induction target 32, 32 ', 32 ", 32"', which is operated with a constant heating current frequency 36 (FIG. 14a) and which is operated with a variable heating current frequency 36 (FIG. 14b). In Figures 14a and 14b is on the frequency in kHz is plotted on an abscissa 116. In FIGS. 14a and 14b, the voltage in (dBpV), in particular decibel microvolts, is plotted on an ordinate 118. The frequency spectrum shows the harmonics 78, which each form peaks. In the two spectra shown (FIGS. 14a and 14b), the permitted limit values for the amplitudes of the harmonics 78 are identified by a limit line 76. The control and / or regulating unit 26 changes the heating current frequency 36 to keep the real or complex conductance constant and achieves the best possible compliance with the EMC standards. In FIG. 14a, a constant heating current frequency 36 of 60 kHz is shown. In FIG. 14, the control and / or regulating unit 26 varies the heating current frequency 36 to minimize non-compliance with the target heating power 30, 30 ′ over the operating period 42. In particular, the control and / or regulating unit 26 achieves the best possible compliance with the EMC standard.

It is conceivable that an operating period 42 has a plurality of mutually different switch-on intervals 40, 40 ′ and / or switch-off intervals 46. It is conceivable that the control and / or regulating unit 26 varies the heating current frequency 36 in order to keep the real and / or complex conductance constant in each switch-on interval 40, 40 ′ of the operating period 42. It is also conceivable that the control and / or regulating unit 26 keeps the real or complex master value for a harmonic 78, in particular the first harmonic 78, constant. In particular, the control and / or regulating unit 26 can perform a frequency analysis, in particular a signal analysis such as a Fourier analysis, and determine the real or complex conductance for a harmonic 78, in particular the first harmonic 78, using the following equations . For example, the following equations are given for the first harmonic 78. where GH is the real conductance to the first harmonic 78 and PH is the achieved heating power at the first harmonic 78 and V _{OH is} the voltage in the operating period 42, which is above the induction target 32, 32 ', 32 ", 32"' Unit 80 is applied. where Y _{H is} the complex conductance for the first harmonic 78 and I _{H is} the current strength at the first harmonic 78 and V _{OH is} the voltage in the operating period 42, which is over which the induction target 32, 32 ', 32 ", 32'" having unit 80 is applied. The control and / or regulating unit 26 can thereby advantageously quickly adapt the heating current frequency 36.

It is conceivable that the control and / or regulating unit 26 performs a variation of the heating current frequency 36 to keep a real and / or complex conductance constant as soon as a measured average value for calculating the complex and / or real conductance is within the specified error tolerances. In particular, various algorithms are conceivable for finding the best possible adaptation of the heating current frequencies 36, in particular when several induction targets 32, 32 ", 32", 32 "" are operated.

It is conceivable that the control and / or regulating unit 26 determines, stores and again a variation of the heating current frequency 36 to keep a real and / or complex conductance constant for various setpoint values 30, 30 'of a cookware 14, 14', 14 ″ from calls. In particular, the impedance of the unit 80 having the induction target 32, 32 ', 32 ", 32'" is material-dependent, in particular on the cookware 14, 14 ', 14 "and the inductor 22, 22', 22", 22 '"and capacitor 68.

It is conceivable that the control and / or regulating unit 26 a variation of the heating current frequency 36, in particular to keep the real and / or complex conductance constant, as a "closed-loop" action such as a feedback loop or some other algorithm, regardless of the Number of induction targets 32, 32 ', 32 ", 32'" or one induction target 32, 32 ', 32 ", 32'" units 80 carries out.

It is conceivable that the control and / or regulating unit 26 can achieve a reduction in the distortion of the supply current by adapting the heating current frequency 36.

A control of the real conductance or complex conductance can be interpreted as a power control or current strength control. The real and complex conductance independent of the amplitude of the rectified supply voltage and equivalent electrical parameters of the cookware 14, 14 ', 14 ".

It is conceivable that the control and / or regulating unit 26 in a frequency sweep state for each cooking vessel 14, 14 ', 14 "of an induction target 32, 32', 32", 32 '", in particular for each one induction target 32, 32 ', 32 ", 32'" having unit 80 critical heating current frequencies 36, in particular harmonics 78 and / or resonance frequencies, be determined and / or stored. It is also conceivable that the control and / or regulating unit 26 applies a frequency spread 74, in particular by means of a reference curve, for each activation of a unit 80 having an induction target 32, 32 ', 32' ', 32' '' to the critical frequencies, in particular Harmonics 78 and / or resonance frequencies, exerts. It is conceivable that the control and / or regulating unit 26 changes the heating current frequency 36 while keeping a real and / or complex conductance constant to an extent that the control and / or regulating unit 26 can avoid an additional frequency spread 74 by means of reference curve 70. In particular, the control and / or regulating unit 26 can correct the heating current frequency 36 to larger and smaller values at any point in time. It is conceivable that the control and / or regulating unit 26 carries out the frequency spread 74, the waveform of the supply current remaining undistorted.

It is conceivable that the control and / or regulating unit 26 has a power factor control, such as keeping the real or complex conductance constant for every conceivable scenario, such as the number of cookware 14, 14 ', 14 ″ to be heated and / or the design of the hob 12 a cooking appliance device 10 applies. It is conceivable that the control and / or regulating unit 26 can vary the heating current frequency 36 while keeping a real and / or complex conductance constant, regardless of the duration of the operating period 42. In a particularly advantageous manner, the control and / or regulating unit 26 can keep the real and / or complex conductance constant over the entire duration of half the period duration of the AC supply voltage. The duration of the operating period 42 preferably corresponds to the duration of half the period duration of the alternating supply voltage.

The control and / or regulating unit 26 can be designed as a real conductance value controller or a complex conductance value controller. The control and / or regulating unit 26 can change the impedance of an induction target 32, 32 ', 32 ", 32'" or an induction target 32, 32 ', 32 ″, 32 ′ ″ having unit 80 counteract in an operating period 42, in particular keep the impedance constant. In particular, the control and / or regulating unit 26, as a real conductance value controller, can control and / or regulate the heating power achieved over each operating period 42 to mimic the waveform of the squared rectified supply voltage.

It is conceivable that the control and / or regulating unit 26 uses an average value of the reference curve 70 of the frequency spread 74 as the value of the real and / or complex conductance of the induction target 32, 32 ', 32 ", which corresponds to the target heating power 30, 30', 32 '"having unit 80 selects.

It is conceivable that the control and / or regulating unit 26 can switch individual inverter units 38, in particular inverters 64, on and / or off.

It is conceivable that the control and / or regulating unit 26 can keep the real or complex conductance constant independently of the resonance frequency of a unit 80 having an induction target 32, 32, 32 ″, 32 ″. It is conceivable that the control and / or regulating unit 26 must vary the heating current frequency 36, 36 ‘more strongly in order to keep the real or complex conductance constant in an area around the resonance frequency than at a greater distance from the resonance frequency.

FIG. 15 schematically shows a flow chart for a method for operating a cooking appliance device 10, in particular an induction hob device.

In at least one periodic permanent heating operating state 50, to which at least one operating period 42 is assigned, at least one induction target 32, 32 ", 32", 32 "" is controlled repetitively and supplied with energy.

In the at least one continuous heating operating state 50, the at least one induction target 32, 32 ', 32 ”, 32”' is set in at least one switch-on interval 40, 40 'of the operating period 42 with a heating power, in particular a target heating power 30, 30' or a power excess a target heating power 30, 30 ', operated.

In the at least one continuous heating operating state 50, the heating current frequency 36 is varied in the switch-on interval 40, 40 ′ of the operating period 42. The at least one continuous heating operating state 50 comprises at least four partial states, in particular at least one input state 52, at least one determination state 54, at least one control state 56 and at least one heating state 58.

In the at least one input state 52, an operator enters a target heating power 30, 30 "for at least one induction target 32, 32", 32 ", 32" ".

In the at least one input state 52, the target frequency for the at least one induction target 32, 32 ", 32", 32 "", in particular from a target heating output 30, 30 "set by the operator, is calculated. In the at least one input state 52, the real and / or complex conductance for the at least one induction target 32, 32 ″, 32 ″, 32 ″, in particular from a target heating output 30, 30 ″ set by the operator, in particular from the target frequency, is calculated.

In the at least one determination state 54, in particular following the at least one input state 52, the switch-on intervals 40, 40 "of each induction target 32, 32", 32 ", 32" "are calculated. In the at least one determination state 54, the real and / or complex guide values, in particular the sum of the real and / or complex guide values, of each induction target 32, 32 ", 32", 32 "’ are calculated.

In the at least one control state 56, in particular following the at least one determination state 54, the switch-on intervals 40, 40 'and switch-off intervals 46 for each induction target 32, 32', 32 ”, 32” ', which have a target heating power 30, 30' to output in an operating period 42, to avoid intermodulation noise and to achieve EMC standards distributed over the operating period 42.

In the at least one heating state 58, in particular following the at least one control state 56, each induction target 32, 32 ', 32 ", 32"' is switched on for at least one operating period 42 with the selected switch-on intervals 40, 40 'and / or switch-off intervals 46 operated to provide the set target heating power 30, 30 '. In the at least one heating state 58, the heating current frequency 36 is set in at least one switch-on interval 40, 40 'for at least one induction target 32, 32', 32 ", 32"', in particular an induction target 32, 32', 32 ", 32"' , having unit 80 varies. In particular, in the at least one heating state 58, the real conductance and / or the complex conductance and / or the impedance in at least one switch-on interval 40, 40 'is kept constant for at least one induction target 32, 32', 32 ", 32"', in particular a unit 80 having an induction target 32, 32', 32 ", 32"'.

In the at least one permanent heating state 50, the partial states are run through repetitively, the parameters selected / calculated and / or ascertained in the partial states changing in the absence of an operator for at least one induction target 32, 32 ', 32 ”, 32”' Target heating power 30, 30 'are maintained.

Reference number

10 Cooking device device

12 hob

14 Cookware

16 mounting plate

18 cooking zone

20 cooking appliance

22 inductor

24 Control Panel

26 Control and / or regulating unit 28 Display

30 Target heating output

32 Induction Target

34 Output heating power 36 Heating current frequency

38 Inverter unit 40 Switch-on interval

42 operating period

44 resonance capacitor unit 46 switch-off interval

48 difference

50 Continuous heating mode 52 Input status

54 State of investigation

56 Tax status

58 Heating status

60 switch element

62 relays Inverter part

Capacitor reference curve middle range frequency spread borderline

Harmonic unity

Maximum frequency Minimum frequency switch-on interval abscissa

ordinate

abscissa

ordinate

abscissa

ordinate

Claims

PATENT CLAIMS

1. Cooking appliance device (10), in particular induction hob device, with at least one control and / or regulating unit (26) which is provided to operate in at least one periodic continuous heating operating state (50) to which at least one operating period (42) is assigned, at least to control an induction target (32, 32 ', 32 ”, 32'”) repetitively and to supply it with energy and the induction target (32, 32 ', 32 ”, 32”') in at least one switch-on interval (40, 40 ') of the Operating period (42) to operate with a heating power, characterized in that the control and / or regulating unit (26) is provided in the continuous heating operating state (50), a heating current frequency (36) for the induction target (32, 32 ', 32 ”, 32” ') to vary in the switch-on interval (40, 40') of the operating period (42).

2. Cooking device device (10), according to claim 1, characterized in that the control and / or regulating unit (26) is provided in the continuous heating operating state (50) at least one impedance of at least one of the induction target (32, 32 ', 32 ”, 32” ') having unit (80) within the switch-on interval (40, 40') at least substantially constant.

3. Cooking appliance device (10) according to claim 1 or 2, characterized in that the control and / or regulating unit (26) is provided in the continuous heating mode (50) at least one real conductance, at least one of the induction target (32, 32 ', 32 ”, 32”') having unit (80) within the switch-on interval (40, 40 ') to be kept essentially constant.

4. Cooking appliance device (10) according to one of the preceding claims, characterized in that the control and / or regulating unit (26) is provided to provide a complex conductance, at least one of the induction target (32, 32 ', in the continuous heating operating state (50)) 32 ”, 32” ') having unit (80) within the switch-on interval (40, 40') to be kept essentially constant.

5. Cooking appliance device (10) according to one of the preceding claims, characterized in that the control and / or regulating unit (26) is provided to control and / or to control the heating current frequency (36) around a target frequency in the continuous heating operating state (50) regulate.

6. Cooking appliance device (10) according to one of the preceding claims, characterized in that the control and / or regulating unit (26) is provided in the continuous heating mode (50) the heating current frequency (36) in the switch-on interval (40, 40 ') to change constantly.

7. Cooking device device (10) according to one of the preceding claims, characterized in that the control and / or regulating unit (26) is provided in the continuous heating mode (50) at least one frequency spread (74) by means of at least one reference curve (70) of the real and / or the complex conductance of at least one unit (80) pointing the induction target (32, 32 ', 32 ”, 32”') to at least one harmonic (78) of at least one of the heating current frequencies (36).

8. Cooking device device (10) according to one of the preceding claims, characterized in that the control and / or regulating unit (26) is provided in the continuous heating operating state (50) at least one second induction target (32, 32 ', 32 ”, 32 ”') To be controlled repetitively and supplied with energy and to operate the second induction target (32, 32', 32”, 32 ”') in at least one second switch-on interval (86, 86') of the operating period (42) with a heating power.

9. Cooking device device (10) according to claim 8, characterized in that the control and / or regulating unit (26) is provided in the permanent heating operating state (50) a second heating current frequency (36 ') for the second induction target (32, 32 ', 32 ", 32"') to vary in the second switch-on interval (86, 86 ') of the operating period (42).

10. Cooking device device (10) according to claim 8 or 9, characterized in that the control and / or regulating unit (26) is provided in the continuous heating mode (50) intermodulation noises of at least two different induction targets (32, 32 ', 32 ”, 32 '”).

11. Cooking device (20), in particular hob (12), with at least one Gargerätevor direction (10) according to one of the preceding claims.

12. A method for operating a cooking appliance device (10), in particular an induction hob device, in particular according to one of claims 1 to 10, wherein in at least one periodic permanent heating operating state (50) to which at least one operating period (42) is assigned, at least one induction target

(32, 32 ', 32 ”, 32”') is repetitively controlled and supplied with energy and the induction target (32, 32 ', 32 ”, 32”') in at least one switch-on interval (40, 40 ') of the operating period (42 ) is operated with a heating power, characterized in that in the continuous heating operating state (50) the Heizstromfre frequency (36) in the switch-on interval (40, 40 ') of the operating period (42) is varied.