Induction energy transmission system and method for operating an induction energy transmission system

Abstract

The invention relates to an induction energy transmission system (10), in particular an induction cooking system, comprising a placement surface (12), comprising a supply unit (14) which has at least one supply induction element (16) arranged below the placement surface (12) for inductively providing energy, comprising at least one placement item (18) which has at least one receiving unit (20) comprising at least one receiving induction element (22) for receiving the inductively provided energy, and comprising an open-loop and / or closed-loop control unit (24) for providing open-loop and / or closed-loop control of the supply unit (14) in order to transmit energy between the supply unit (14) and the receiving unit (20), wherein the open-loop and / or closed-loop control unit (24) is intended to use a parameter set (26) to provide open-loop and / or closed-loop control of the supply unit (14) and to receive at least one parameter (28) from the placement item (18). In order to provide improved ease of use for an induction energy transmission system (10), the open-loop and / or closed-loop control unit (24) is provided to switch off, in at least one operating state, the frequency modulation of the supply unit (14) depending on the at least one parameter (28) received from the at least one placement item (18).

Description

[0001] Induction energy transfer system and method for operating an induction energy transfer system

[0002] The invention relates to an induction energy transfer system according to the preamble of claim 1 and a method for operating an induction energy transfer system according to the preamble of claim 12.

[0003] Induction energy transfer systems for the inductive transfer of energy from a primary coil to a secondary coil of a mounting unit are already known in the art. For example, induction cooktops are known which, in addition to inductively heating cookware, are also designed for the inductive power supply of small household appliances. Control of the power supply unit by a control unit is based on a parameter set, whereby in some known induction energy transfer systems at least one parameter of the parameter set, such as the self-inductance of the secondary coil, an energy demand, or a total electrical load, is transmitted wirelessly, for example via NFC, from the mounting unit to the control unit.Given the very large number of different installation units that can be inductively powered, the problem with existing inductive power transmission systems is that they cannot provide individual and demand-based control of the inductively supplied energy for each installation unit. US 2022 / 0255355 A1, for example, describes a method for operating a wireless power transmission device using inductive coupling. The method includes controlling the electrical output power of the inverter to a predefinable target electrical power by iteratively manipulating the frequency and duty cycle of the pulse-width modulated control signal. It is disclosed that the start frequency and start duty cycle are selected such that the target power is undershot.

[0004] Particularly during commissioning, switching between different operating modes to provide various functions, or during load changes, detrimentally long response times occur, potentially leading to under- or over-supply of inductively provided energy until the supply power is adjusted. This results in undesirable behavior, such as speed fluctuations during stirring processes, reduced efficiency in inductive energy transfer, or even damage to electronic and / or mechanical components in the case of over-supply, thus significantly impairing user-friendliness.

[0005] The object of the invention is, in particular but not limited to, providing a generic device with improved user-friendliness. This object is achieved according to the invention by the features of claims 1 and 12, while advantageous embodiments and further developments of the invention can be found in the dependent claims.

[0006] The invention relates to an induction energy transfer system, in particular an induction cooking system, comprising a base plate, a supply unit which has at least one supply induction element arranged below the base plate for inductive provision of energy, at least one base unit which has at least one receiving unit with at least one receiving induction element for receiving the inductively provided energy, and a control and / or regulating unit for controlling and / or regulating the supply unit for energy transfer between the supply unit and the receiving unit, wherein the control and / or regulating unit is provided to use a parameter set for controlling and / or regulating the supply unit and to receive at least one parameter from the base unit.

[0007] It is proposed that the control and / or regulating unit be designed to switch off the frequency modulation of the power supply unit in at least one operating state, depending on at least one parameter received from the installation unit.

[0008] Such a design advantageously provides an induction power transfer system with a particularly high level of user-friendliness. In particular, the control of the power supply unit can be advantageously improved, thereby optimizing the response time when adjusting the inductively supplied power. Furthermore, operational reliability can be increased, with system components, especially those of the power supply unit and / or the mounting unit, preferably being protected from overvoltages and the associated potential damage, and being operated within a safe range. Thus, an induction power transfer system with a particularly reliable and durable mounting unit can be provided, and user-friendliness and the user experience can be advantageously improved.

[0009] The induction energy transfer system has at least one main functionality in the form of wireless energy transmission, in particular in the form of wireless power supply to installation units. In an advantageous embodiment, the induction energy transfer system is configured as an induction cooking system and therefore, in addition to the main functionality of wireless energy transmission, has a further main functionality in the form of a cooking function. For example, the induction energy transfer system could be configured as an induction oven system and / or as an induction grill system.

[0010] In particular, the power supply unit could be designed as part of an induction oven and / or as part of an induction grill. Preferably, the induction energy transfer system, designed as an induction cooking system, is designed as an induction cooktop system. The power supply unit is then specifically designed as part of an induction cooktop. In a further advantageous embodiment, the induction energy transfer system is designed as a kitchen power supply system and, in addition to its primary function of supplying power and operating small household appliances, can also provide cooking functions.

[0011] A "power supply unit" is defined as a unit that inductively provides energy in at least one operating state and whose primary function is, in particular, energy provision. For the purpose of providing energy, the power supply unit comprises at least one induction element, which in particular includes at least one coil, especially at least one primary coil, and / or is designed as a coil, and which inductively provides energy, particularly in the operating state.The power supply unit could have at least two, in particular at least three, advantageously at least four, particularly advantageously at least five, preferably at least eight, and particularly preferably more power supply induction elements, each of which could inductively supply energy in the operating state, in particular to a single receiving induction element or to at least two or more receiving induction elements of at least one mounting unit and / or at least one further mounting unit. At least some of the power supply induction elements could be arranged in close proximity to one another, for example in a series and / or in the form of a matrix. Preferably, the power supply unit has at least one compensation capacitor, which can be connected electrically in parallel or in series with the power supply induction element, and which can in particular be provided for reactive power compensation.

[0012] A "mounting unit" is defined as a unit that inductively receives energy in at least one operating state and converts at least part of the inductively received energy into at least one other form of energy to provide at least one primary function. For example, the energy inductively received by the mounting unit could be converted, particularly directly, into at least one other form of energy, such as heat. Alternatively or additionally, the mounting unit could include at least one electrical load, such as an electric motor or the like. The mounting unit comprises at least one receiving unit with a receiving induction element for receiving the inductively provided energy.The receiving unit could, for example, have at least two, in particular at least three, advantageously at least four, particularly advantageously at least five, preferably at least eight and particularly preferably several receiving induction elements, which in the operating state could each inductively receive energy, in particular from the supply induction element.

[0013] The mounting unit could, for example, be designed as a cooking vessel. The cooking vessel preferably has at least one food receiving chamber and, during operation, converts at least part of the inductively received energy into heat for heating food arranged in the food receiving chamber. Preferably, the mounting unit designed as a cooking vessel has at least one further unit for providing at least one additional function that goes beyond and / or differs from simply heating food. For example, the further unit could be designed as a temperature sensor, a stirring unit, or the like.

[0014] Alternatively, the installation unit could be part of a small household appliance or be designed as a small household appliance itself. Preferably, the small household appliance is a portable appliance comprising at least the induction charging unit and at least one functional unit that provides at least one household appliance function in its operating state. "Portable" in this context means that the small household appliance can be freely positioned within a household by a user, particularly without the need for tools, in contrast to a large household appliance, which is permanently positioned and / or installed in a specific location within a household, such as an oven or a refrigerator. Preferably, the small household appliance is designed as a small kitchen appliance and provides at least one primary function for food preparation in its operating state.The small household appliance could, without being limited to, be designed, for example, as a food processor and / or as a mixer and / or as a stirrer and / or as a mill and / or as a kitchen scale or as a kettle or as a coffee machine or as a rice cooker or as a milk frother or as a deep fryer or as a toaster or as a juicer or as a slicer or the like.

[0015] The at least one receiving induction element of the receiving unit comprises at least one secondary coil and / or is configured as a secondary coil. In an operating state of the receiving unit, the receiving induction element supplies at least one load of the receiving unit with electrical energy. Furthermore, it is conceivable that the receiving unit has an energy storage device, in particular a battery, which is designed to store electrical energy received via the receiving induction element in a charged state and to make it available to supply the functional unit in a discharged state. Preferably, the receiving unit has at least one load resistor and / or at least one compensation capacitor, which is connected electrically in parallel or in series with the receiving induction element and which may, in particular, be used for reactive power compensation.The term "support plate" is understood to mean at least one unit, particularly a plate-like unit, designed for setting up at least one support unit and / or for placing at least one item being cooked on it. The support plate could, for example, be designed as a worktop, particularly a kitchen worktop, or as a section of at least one worktop, particularly a kitchen worktop, or of the induction energy transfer system. Alternatively or additionally, the support plate could be designed as a cooktop surface.The mounting plate, designed as a cooktop plate, could in particular form at least part of a cooktop outer housing and, in particular, together with at least one outer housing unit, to which the mounting plate designed as a cooktop plate could be connected in at least one assembled state, form at least a large part of the cooktop outer housing. Preferably, the mounting plate is made of a non-metallic material. The mounting plate could, for example, be made at least a large part of glass and / or glass-ceramic and / or Neolith and / or Dekton and / or wood and / or marble and / or stone, in particular natural stone, and / or laminate and / or plastic and / or ceramic.In this document, location terms such as "below" or "above" refer to the mounting plate being installed in its final state, unless explicitly stated otherwise. In the installed state, the supply unit is preferably located below the mounting plate.

[0016] A "control and / or regulation unit" is defined as an electronic unit designed to control and / or regulate at least the power supply unit. The control and / or regulation unit comprises a processing unit and, in particular, a storage unit containing at least one control and / or regulation program intended to be executed by the processing unit. The control and / or regulation unit includes at least one inverter unit. Preferably, the inverter unit performs frequency conversion during operation, specifically converting a low-frequency AC input voltage into a high-frequency AC output voltage. Preferably, the low-frequency AC voltage has a frequency of at most 100 Hz. Preferably, the high-frequency AC voltage has a frequency of at least 1000 Hz.Preferably, the inverter unit is designed to adjust the energy inductively supplied by the at least one supply induction element by adjusting the high-frequency alternating voltage, in particular via a frequency and / or a duty cycle. Preferably, the control unit comprises at least one rectifier. The inverter unit has at least one inverter switching element. Preferably, the inverter switching element generates an oscillating electric current for operating the at least one supply induction element, preferably with a frequency of at least 15 kHz, in particular at least 17 kHz, and advantageously at least 20 kHz. Preferably, the inverter unit comprises at least two inverter switching elements, which are preferably designed as bipolar transistors with insulated gate electrodes, and particularly advantageously at least one damping capacitor.The control unit is specifically designed to apply a current of the frequency of the measuring point to the supply induction element during a measurement at a measuring point and to measure the power output of the supply induction element and / or at least one physical quantity related to the power, in particular a voltage and / or a current. The control unit is preferably designed to perform the measurement at the measuring point during at least one half-cycle of a mains supply voltage. The control unit can, in particular, be designed to repeat the measurement at the measuring point and / or the calculation of a power-frequency transfer function at regular intervals, especially periodically.The control and / or regulating unit is specifically designed to select the operating point for a power supply to the recording unit and to control the supply unit accordingly, particularly within the same half-wave in which the measurement was carried out.

[0017] A "parameter set" is understood to mean a plurality of parameters, in particular at least two parameters, which the control unit uses, in particular to control the power supply, and on the basis of which the control unit controls, in particular, the energy inductively supplied by the power supply unit according to a type of installation unit and / or according to a current operating state of the installation unit, which can be selected, in particular, by a user of the inductive energy transfer system. The parameter set could include at least one constant constructive and / or geometric characteristic of the supply induction element and / or the receiving induction element.Constructive and / or geometric parameters could, but are not limited to, include, for example, a shape and / or size, in particular a radius and / or inner diameter and / or an outer diameter, and / or a cross-sectional area and / or a number of windings and / or a material and / or a spatial position of the receiving induction element within the mounting unit, and / or a vertical distance of the supply induction element to the mounting plate, and / or the like. The parameter set can advantageously include parameters of the mounting unit and / or the induction energy transfer system. It is particularly advantageous for at least one parameter from the mounting unit to be part of the parameter set.

[0018] Preferably, at least one parameter of the parameter set comprises an electrical characteristic of the supply induction element and / or the receiving induction element, in particular a time-varying characteristic, for example, magnitudes of electrical resistances and / or impedances in a primary circuit of the supply unit and / or in a secondary circuit of the receiving unit and / or inductances, in particular self-inductances, and / or magnetic flux densities of the supply induction element and / or the receiving induction element and / or a resonance frequency and / or a material constant, for example, a magnetic permeability of a magnetic flux-bundling element of the supply unit and / or the receiving unit.Furthermore, at least one parameter of the parameter set can include at least one operating characteristic of the installation unit, for example a maximum power and / or a minimum power and / or number of power levels and / or a number and / or type of operable electrical loads and / or a voltage and / or current required in an operating state.

[0019] The power-frequency transfer function, in particular, describes the relationship between the power output of the supply inductor and the frequency of the current flowing in the supply inductor. The power-frequency transfer function can include a single maximum at a specific frequency or multiple maxima at different frequencies.

[0020] In this document, numerical prefixes such as "first" and "second" serve solely to distinguish between objects and / or to establish relationships between objects, and do not imply a total number or ranking of the objects. In particular, a "second object" does not necessarily imply the existence of a "first object".

[0021] The term "intended" means specifically programmed, designed, and / or equipped. The fact that an object is intended for a specific function means that the object fulfills and / or executes this specific function in at least one application and / or operating state.

[0022] Furthermore, it is proposed that the control unit be designed to switch off the power supply within half a period of the supply voltage. Such a design advantageously increases ease of use and operational reliability. In particular, it allows for a fast response time for controlling the power supply. Advantageously, the control unit switches off the power supply at a specific time within half a period of the supply voltage. Preferably, the control unit switches off the power supply after 50% of half a period of the supply voltage. Particularly preferably, the power supply is switched off by the control unit after 25% of half a period, and most preferably after 75% of half a period.Alternatively, it would be conceivable that the control and / or regulating unit switches off the supply unit not at a specific time, but based on a measured value during a half-period of the supply voltage.

[0023] Furthermore, it is proposed that the control unit be designed to switch off the power supply unit at a switching point when integration via a controlled variable reaches a predetermined threshold. This can advantageously improve ease of use. Moreover, such a design can advantageously increase operational reliability. In particular, the control unit integrates via a power output from the power supply unit. Preferably, the control unit integrates via an electrical current supplied to the power supply unit. In particular, the threshold is a parameter received from the installation unit. Alternatively, it would be conceivable that the threshold is advantageously a constant value, or, particularly advantageously for each installation unit, a value stored in a database of the induction energy transfer device.In particular, the threshold value represents a maximum value of the power output to be delivered by the supply unit. Preferably, the threshold value represents a maximum value of the supply current of the supply unit. Alternatively, it would be conceivable that the threshold value represents a maximum value of the power output received by the installation unit, and that the control unit receives this threshold value from the installation unit.

[0024] Furthermore, it is proposed that the control unit be designed to determine a starting frequency based on a power-frequency curve such that the threshold is reached within half a cycle of the supply voltage. This design can improve ease of use. In particular, it can also enhance safety, as the response time for adjusting power output can be advantageously reduced. Specifically, the control unit can determine, based on a power-frequency curve, a frequency at which the power supply delivers a given power output. Preferably, the control unit uses the power-frequency curve to determine a frequency at which the power output from the power supply is 5% higher than the required power output.This ensures, in particular, that the threshold is reached within half a period of the supply voltage and thus the supply unit is switched off.

[0025] Furthermore, it is proposed that the control unit be designed to calculate a corrected power-frequency curve based on the time the threshold is reached and to determine a corrected start frequency from this. This further improves ease of use. In particular, the efficiency of inductive power transfer can be improved. Advantageously, the control unit determines a corrected start frequency based on the switch-off time and the power output of the power supply unit in the preceding half-period. A particularly advantageous aspect of operating the power supply unit with the corrected start frequency is that the difference between the power received by the installation unit and the power required by the installation unit is reduced compared to the preceding half-period.Preferably, the control unit is designed to use additional parameters besides the time at which the threshold is reached, particularly as starting values ​​for an iterative calculation procedure. Advantageously, these additional parameters can be stored in a memory unit of the control unit and / or transmitted from the installation unit to the control unit. Particularly advantageously, these additional parameters can also be quantities measured during the preceding half-period.

[0026] It is further proposed that the control unit be designed to recalculate the corrected power-frequency curve and the corrected starting frequency using an iterative calculation method with at least one iteration step. This allows the power-frequency curve to be further improved and thus adapted to the actual situation. In particular, the iterative calculation method uses parameters from the previous half-period, such as the switch-off time of the power supply unit, the power provided by the power supply unit, and / or the power received by the installation unit, as new values ​​instead of the initial values ​​to calculate a corrected power-frequency curve. This is done to obtain a further corrected power-frequency curve, which then preferably approximates the actual situation more closely with each iteration.The iterative calculation method advantageously performs X iterations, where X is a natural number. Preferably, the iterative calculation method is stopped when the difference between the power demanded by the installation unit and the power received by the installation unit falls below a threshold value. Advantageously, the threshold value is a maximum of 10%, particularly advantageously a maximum of 5%, and most advantageously a maximum of 2% of the power demanded by the installation unit. Efficiency can be advantageously increased if the control unit is designed to use the same measured parameters in each iteration step. In particular, this allows for rapid execution of the iteration process and, consequently, rapid adjustment of the energy transfer during commissioning or load changes.This also advantageously improves safety, especially operational safety, as electronic and / or mechanical components of the installation unit can be advantageously protected from an oversupply of energy.

[0027] Furthermore, it is proposed that the control unit be designed to deactivate the determination of the shutdown time and the shutdown of the power supply unit within a half-cycle of the supply voltage. This allows for a significantly improved level of user-friendliness. In particular, such a design offers greater flexibility regarding compatibility with installation units that require different electrical power levels for operation. Specifically, this also allows for the safe operation of installation units with high power consumption.

[0028] Furthermore, it is proposed that the control unit be designed to employ predictive control to control the supply unit. This will provide, in particular, a significantly higher level of user-friendliness and a preferably high level of safety, especially operational reliability.

[0029] Furthermore, it is proposed that the induction energy transfer system include a communication unit for wireless data transmission, particularly via NFC, between the control unit and the installation unit. Such a design advantageously improves ease of use. It allows for particularly simple, fast, and reliable data transmission, especially simple, fast, and reliable parameter reception by the control unit. The communication unit is preferably designed for bidirectional wireless data transmission, i.e., for both wireless reception and wireless transmission of data. Preferably, the communication unit includes at least one communication element that is connected to the control unit and is specifically designed for wireless data reception and transmission.Preferably, the communication unit comprises at least one further communication element, which is arranged within the installation unit and is specifically designed for wireless data reception and transmission. The communication unit could be configured for wireless data transmission between the installation unit and the control and / or regulating unit via RFID, Wi-Fi, Bluetooth, ZigBee, or another suitable standard. Preferably, the communication unit is configured for wireless data transmission between the installation unit and the control and / or regulating unit via NFC. This advantageously provides an induction energy transfer system that is compatible with a large number of installation units.

[0030] The invention further relates to an induction household appliance, in particular an induction cooktop, of an induction energy transfer system according to one of the previously described embodiments, which comprises the power supply unit and the control and / or regulation unit. Such an induction household appliance is characterized in particular by increased ease of use when operating within the induction energy transfer system.

[0031] The invention also relates to a mounting unit, in particular a small household appliance, for an induction energy transfer system according to one of the previously described embodiments. In particular, such a mounting unit is characterized by increased ease of use when operated in conjunction with the induction energy transfer system.

[0032] Furthermore, the invention relates to a method for operating an induction energy transfer system, in particular according to one of the embodiments described above, comprising a mounting plate, a supply unit which has at least one supply induction element arranged below the mounting plate for inductively providing energy, at least one mounting unit which has at least one receiving unit with at least one receiving induction element for receiving the inductively provided energy, and a control and / or regulating unit for controlling and / or regulating the supply unit for energy transfer between the supply unit and the receiving unit, wherein, for controlling and / or regulating the supply unit, the control and / or regulating unit uses a parameter set and receives at least one parameter from the mounting unit.which, in at least one operating state, switches off the frequency modulation of the power supply unit depending on at least one parameter received from the installation unit.

[0033] The induction energy transfer system is not intended to be limited to the application and embodiment described above. In particular, the induction energy transfer system may, to fulfill a function described herein, have a different number of individual elements, components, and units than specified herein.

[0034] Further advantages will become apparent from the following description of the drawings. The drawings illustrate an embodiment of the invention. The drawings, the description, and the claims contain numerous features in combination. A person skilled in the art will expediently consider the features individually and combine them into meaningful further combinations.

[0035] They show:

[0036] Fig. 1 shows a schematic representation of an induction energy transmission system comprising a supply unit, a control and / or regulation unit for controlling and / or regulating the supply unit, a mounting unit and another mounting unit, each comprising a receiving unit.

[0037] Fig. 2 shows a schematic equivalent circuit diagram to illustrate an inductive energy transfer between a supply induction element of the supply unit and a receiving induction element of the receiving unit.

[0038] Fig. 3 is a schematic diagram illustrating the supply voltage of the power supply unit and the output voltage of the inverter. Fig. 4 is a schematic diagram illustrating the rectified supply voltage, the time course of the frequency-modulated output of the power supply unit, and the switching point at which the control unit switches off the power supply unit when a threshold value for a controlled variable is reached.

[0039] Fig. 5 shows a schematic diagram illustrating three power-frequency curves under different electrical loads and

[0040] Fig. 6 is a schematic diagram illustrating a method for operating an induction energy transfer system.

[0041] Figure 1 shows a schematic representation of an induction energy transfer system 10. The induction energy transfer system 10 has a mounting plate 12 for mounting a mounting unit 18 and a further mounting unit 19. In this case, the mounting plate is designed as a cooktop plate, which consists largely of glass.

[0042] The induction energy transfer system 10 comprises a supply unit 14 with a supply induction element 16 arranged below the mounting plate 12 for providing inductive energy. In this case, the supply unit 14 includes a total of four supply induction elements 16, although any other number would be conceivable.

[0043] The induction energy transfer system 10 includes the mounting unit 18. The mounting unit 18 has a receiving unit 20 with a receiving induction element 22 for receiving the energy inductively supplied by the power supply unit 14. In this case, the mounting unit 18 is configured as a kitchen appliance. The induction energy transfer system 10 also includes a further mounting unit 19. The further mounting unit 19 also includes a receiving unit 20 with a receiving induction element 22 for receiving the energy inductively supplied by the power supply unit 14. The further mounting unit 19 is configured as a kettle. The induction energy transfer system 10 can include further mounting units 19 (not shown).

[0044] The inductive energy transfer system 10 includes a control and / or regulating unit 24 for controlling and / or regulating the supply unit 14 for inductive energy transfer between the supply unit 14 and the receiving unit 20. The control and / or regulating unit 24 is designed to switch off the frequency modulation of the supply unit 14 in at least one operating state depending on at least one parameter 28 of a parameter set 26 received by the installation unit 18.

[0045] The induction energy transmission system 10 includes a communication unit 43. The communication unit 43 is designed for wireless data transmission between the control unit 24 and the installation unit 18. The communication unit 43 is also designed for wireless data transmission between the additional installation unit 19 and the control unit 24. The communication unit 43 includes a communication element (not shown) connected to the control unit 24 for wireless data transmission and reception. The communication unit 43 also includes a further communication element (not shown) located in the installation unit 18 for wireless data transmission and reception.The communication unit 43 also has a further communication element (not shown), which is arranged in the additional mounting unit 19 and is designed for wireless data transmission and reception. In this case, the communication unit 43 is configured as an NFC communication unit and is designed for wireless data transmission via NFC between the control unit 24 and the mounting unit 18 and / or the additional mounting unit 19.

[0046] The control and / or regulating unit 24 comprises a storage unit and a processing unit. For controlling and / or regulating and supplying power to the supply unit 14, the control and / or regulating unit 24 further comprises an inverter unit 44, which is designed in a known manner to provide high-frequency alternating current for the supply induction element 16.

[0047] In an operating state of the induction energy transfer system 10, the control unit 24 wirelessly receives at least one parameter 28 from the installation unit 18 via the communication element of the communication unit 43 and stores it in the storage unit. The storage unit of the control unit 24 also stores further parameters 28 from the parameter set 26. The parameter set 26 comprises the power required for operation by the installation unit 18. The parameter set 26 can also include the power actually received by the receiving induction element 22 from the supply induction element 16. In addition to the two parameters 28 mentioned above, the parameter set 26 can include further parameters, which can also be stored in the storage unit and / or received wirelessly by the control unit 24 from the installation unit 18 via the communication element.Furthermore, the computing unit may be designed to calculate some parameters 28 of the parameter set 26 from other parameters 28 of the parameter set 26 or to obtain them by measurement.

[0048] Figure 2 shows a schematic equivalent electrical circuit to illustrate inductive energy transfer between the supply induction element 16 of the supply unit 14 and the receiving induction element 22 of the receiving unit 20. The supply unit 14 has at least one inverter unit 44 for supplying the supply unit 14 with alternating current and includes a compensation capacitor 48 and an electrical load 46. In addition to the receiving induction element 22, the receiving unit includes a compensation capacitor 50 and an electrical load 52. In an operating state, the control unit 24 controls the energy inductively supplied by the supply induction element 16 by changing the frequency of the alternating current supplied by the inverter unit 44.In the operating state, the supply induction element 16 generates an alternating electromagnetic field through which energy is inductively supplied. In this operating state, a magnetic flux of the alternating electromagnetic field generated by the supply induction element 16 is at least partially coupled to the receiving induction element 22, such that an alternating voltage is induced in the receiving induction element 22, and thus at least a portion of the inductively supplied energy is received. The mounting unit 18 has at least one electrical load 52. In the operating state, the electrical load 52 is supplied with the alternating voltage induced in the receiving induction element 22.

[0049] Figure 3 shows a schematic diagram illustrating a supply voltage and the frequency-modulated output 58 from the power supply unit 14 to the supply induction element 16. The ordinate 54 of the diagram represents a voltage in volts. The abscissa 56 of the diagram represents a time in seconds. The power supply unit 14 is switched on during the first part of a half-cycle 30 of the supply voltage 32 and supplies a frequency-modulated alternating current to the supply induction element 16. During the remaining part of a half-cycle 30 of the supply voltage 32, the power supply unit 14 is switched off.

[0050] Figure 4 shows a schematic diagram illustrating the rectified supply voltage 32 and the time course of the frequency-modulated output of the power supply unit 14, with a switching point 34 at which the control unit 24 switches off the power supply unit 14 upon reaching a threshold value 38 for a controlled variable 36. A voltage in volts is plotted on the ordinate 60 of the diagram. A time in seconds is plotted on the abscissa 62 of the diagram. The rectified supply voltage 32 extends in the same direction for each half-period 30 of the supply voltage 32, in this case to positive values. The power supply unit 14 outputs a frequency-modulated current to the supply inductor 16 at the beginning of each half-period 30 of the supply voltage 32. The switching point 34 results from the time when a controlled variable 36, integrated by the control unit 24, reaches the threshold value 38.The control unit 24 determines the controlled variable 36 from the parameter 28 of the parameter set 26 received by the installation unit 18. For example, the control unit 24 integrates a power output. The time at which a threshold value 38 for the power output is reached is the switching point 34, at which the supply unit 14 is switched off for the remaining period 64 of the half-period 30, before the control unit 24 switches the supply unit 14 back on at the beginning of the following half-period 30. The length of the period 64 depends on when the threshold value 38 is reached during a half-period 30.The control and / or regulating unit 24 is designed to select a frequency for the supply unit 14 such that a higher than required power is output and the threshold value 38 is reached during a half-period 30 and the supply unit 14 is switched off by the control and / or regulating unit 24 from the switching time 34 for the remaining period 64 of the half-period 30.

[0051] Figure 5 shows a schematic diagram for representing power-frequency-

[0052] Curves for different electrical loads at the installation unit 18. Power in watts is plotted on the ordinate 66 of the diagram. Frequency in hertz is plotted on the abscissa 68 of the diagram. A power-frequency curve 72 is an approximation of the power transmission as a function of the frequency of the alternating current supplied by the power supply unit 14 to the supply induction element 16. To determine the power-frequency curve 72, parameters of the power supply unit 14 and parameters from the parameter set 26, which is received wirelessly, in particular via NFC, from the installation unit 18 by the control unit 24 using the communication unit 43, are used. The control unit 24 is designed to determine the frequency required for a specified power output based on the power-frequency curve 72.The frequency determined in this way is used by the control unit 24 at the beginning of a half-period 30 of the supply voltage 32 as the initial frequency of the frequency-modulated output 58 of the power supply unit 14. The power-frequency curve 70 shows the approximation of the power as a function of frequency for a 50% reduction in the electrical load 52 of the installation unit 18 compared to the power-frequency curve 72. A power-frequency curve 74 shows the approximation of the power as a function of frequency for a 50% increase in the electrical load of the installation unit 18 compared to the power-frequency curve 72.

[0053] Figure 6 shows a schematic diagram illustrating a method for operating the induction energy transmission system 10. The control unit (24) is designed to recalculate a corrected power-frequency curve and a corrected start frequency using an iterative calculation method with at least one iteration step. In step 200, the control unit 24 determines a possible power-frequency curve 72 based on parameters of the parameter set 26 received by the installation unit 18 via the communication unit 43. In order to provide the power required by the installation unit 18, the control unit 24 determines a frequency in a subsequent step 210 based on the power-frequency curve 72, which is used as the start frequency for the frequency-modulated output of the power supply unit 14.The control unit 24 is designed to determine the starting frequency based on the power-frequency curve 72 such that a higher power output than required by the installation unit 18 is delivered. In a further step 220, the control unit 24 modulates the frequency for the frequency-modulated output 58 of the power supply unit 14, beginning at the start of a half-period 30 of the supply voltage 32. In a further step 230, the control unit 24 integrates the controlled variable 36 and determines the switching time 34 at which the integrated controlled variable 36 reaches the threshold value 38. At the switching time 34, the control unit 24 switches off the power supply unit 14 for the remaining period 64 of the half-period 30.In a further step 240, the control unit 24 determines a corrected power-frequency curve based on the switching time 34 determined in step 230, the duration of the period 64, and the parameter set 26. This corrected curve better represents the actual relationship between power and frequency. Following step 240, step 210 is executed using the corrected power-frequency curve. Steps 210, 220, 230, and 240 are steps in an iterative calculation procedure by which the difference between the power demanded by the installation unit 18 and the power received by the installation unit 18 decreases with each iteration. In this case, the control unit 24 is designed to perform five iterations, although a different number would also be conceivable.With each iteration step, a power-frequency curve is improved, thus achieving more precise control of the power supply unit 14 by the control unit 24. After completing the iterative calculation procedure, in an optional step 250, the control unit 24 is configured to deactivate the determination of the switch-off time and the switch-off of the power supply unit 14 within a half-period 30 of the supply voltage 32. In a further step 260, the frequency of the alternating current output via the supply induction element 16 is fine-tuned using known, conventional methods.

[0054] Of the objects that appear multiple times in the figures, only one is marked with a reference symbol. Reference symbol

[0055] 10 Induction energy transmission system

[0056] 12 Mounting plate

[0057] 14 supply units

[0058] 16 Supply induction element

[0059] 18 installation units

[0060] 20 recording units

[0061] 22 Recording induction element

[0062] 24 Control and / or regulating unit

[0063] 26 parameter set

[0064] 28 parameters

[0065] 30 half-period

[0066] 32 Supply voltage

[0067] 34 Switching point

[0068] 36 Control variable

[0069] 38 Sulfation value

[0070] 40 Power-frequency curve

[0071] 43 Communication unit

[0072] 44 Inverter unit

[0073] 46 electrical load

[0074] 48 Compensation capacitor

[0075] 50 Compensation capacitor

[0076] 52 electrical load

[0077] 54 ordinates

[0078] 56 Abscissa

[0079] 58 frequency-modulated output

[0080] 60 ordinates

[0081] 62 Abscissa

[0082] 64 Period Ordinate

[0083] abscissa

[0084] curve

[0085] curve

[0086] curve

[0087] Step

[0088] Step

[0089] Step

[0090] Step

[0091] Step

[0092] Step

[0093] Step

Claims

Claims 1. Induction energy transfer system (10), in particular an induction cooking system, comprising a mounting plate (12), a power supply unit (14) which has at least one power supply induction element (16) arranged below the mounting plate (12) for inductively supplying energy, at least one mounting unit (18) which has at least one receiving unit (20) with at least one receiving induction element (22) for receiving the inductively supplied energy, and a control and / or regulation unit (24) for controlling and / or regulating the power supply unit (14) for energy transfer between the power supply unit (14) and the receiving unit (20), wherein the control and / or regulation unit (24) is provided to use a parameter set (26) for controlling and / or regulating the power supply unit (14) and to receive at least one parameter (28) from the mounting unit (18), characterized in thatthat the control and / or regulating unit (24) is designed to switch off the frequency modulation of the supply unit (14) in at least one operating state depending on at least one parameter (28) received from the installation unit (18).

2. Induction energy transmission system (10) according to claim 1 , characterized in that the control and / or regulating unit (24) is provided to switch off the supply unit (14) within a half-period (30) of the supply voltage (32).

3. Induction energy transmission system (10) according to one of the preceding claims, characterized in that the control and / or regulating unit (24) is provided to switch off the supply unit (14) at a switching time (34) when an integration over a control variable (36) reaches a predetermined threshold value (38).

4. Induction energy transmission system (10) according to claim 3, characterized in that the control and / or regulating unit (24) is provided to determine a start frequency on the basis of a power-frequency curve (40) such that the threshold value (38) is reached within a half-period (30) of the supply voltage (32).

5. Induction energy transmission system (10) according to claim 4, characterized in that the control and / or regulating unit (24) is provided to calculate a corrected power-frequency curve based on the time of reaching the threshold value (38) and to determine a corrected starting frequency from it.

6. Induction energy transmission system (10) according to claim 5, characterized in that the control and / or regulating unit (24) is provided to recalculate the corrected power-frequency curve and the corrected starting frequency using an iterative calculation method with at least one iteration step.

7. Induction energy transmission system (10) according to one of the preceding claims, characterized in that the control and / or regulating unit (24) is provided to deactivate the determination of the switch-off time and the switch-off of the supply unit (14) within a half-period (30) of the supply voltage (32).

8. Induction energy transmission system (10) according to one of the preceding claims, characterized in that the control and / or regulating unit (24) is provided to apply a predictive control for controlling the supply unit (14).

9. Induction energy transmission system (10) according to one of the preceding claims, characterized by a communication unit (43) for wireless data transmission, in particular by NFC, between the control and / or regulating unit (24) and the installation unit (18).

10. Induction household appliance, in particular induction hob, of an induction energy transmission system (10) according to one of the preceding claims, characterized by the supply unit (14) and the control and / or regulating unit (24).

11. Installation unit (18), in particular a small household appliance, of an induction energy transmission system (10) according to one of the preceding claims.

12. Method for operating an induction energy transfer system (10), in particular according to one of claims 1 to 9, comprising a mounting plate (12), a supply unit (14) which has at least one supply induction element (16) arranged below the mounting plate (12) for inductively providing energy, at least one mounting unit (18) which has at least one receiving unit (20) with at least one receiving induction element (22) for receiving the inductively provided energy, and a control and / or regulation unit (24) for controlling and / or regulating the supply unit (14) for energy transfer between the supply unit (14) and the receiving unit (20), wherein, for controlling and / or regulating the supply unit (14), the control and / or regulation unit (24) uses a parameter set (26) and receives at least one parameter (28) from the mounting unit (18), characterized in thatthat in at least one operating state the frequency modulation of the supply unit (14) is switched off depending on at least one parameter (28) received from the installation unit (18).

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