INDUCTION ENERGY TRANSMISSION SYSTEM

Description

[0001] 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 15.

[0002] Induction energy transfer systems for the inductive transfer of energy from a primary coil of a power supply unit 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.The parameters of the parameter set, particularly those relating to the installation unit, are assumed to be constant in previously known inductive power transfer systems, and changes in these parameters occurring during operation are not taken into account. This results in disadvantageously long response times during commissioning or load changes, low efficiency in inductive power transfer, and the risk of potential damage to components, for example, from overvoltages due to inaccurate parameters. Consequently, the user-friendliness of previously known inductive power transfer systems is reduced.

[0003] EP2878169B1 discloses an induction energy transfer system according to the preamble of claim 1.

[0004] 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 15, while advantageous embodiments and further developments of the invention can be found in the dependent claims.

[0005] The invention relates to an induction energy transmission system, in particular an induction cooking system, with a supply unit which has at least one supply induction element for the inductive provision of energy, with a control unit for controlling the supply unit, and with at least one installation unit which has at least one receiving unit with at least one receiving induction element for receiving the inductively provided energy, wherein the control unit is provided to use a parameter set for controlling the supply unit and to receive at least one parameter of the parameter set from the installation unit.

[0006] It is proposed that the control unit be designed to determine at least one correction factor for at least one parameter of the parameter set.

[0007] Such a design advantageously provides an induction energy transfer system with exceptionally high ease of use. In particular, it optimizes the response time when adjusting the inductively supplied power from the power supply unit. Furthermore, changes in the inductive coupling between the power supply unit's induction element and the receiving induction element can be reliably detected and taken into account when controlling the power supply unit, enabling particularly precise control. Moreover, it advantageously enables highly efficient operation of the induction energy transfer system. In addition, it advantageously increases safety. Specifically, it prevents overvoltages and the associated potential damage to components of the induction energy transfer system.

[0008] The induction energy transfer system has at least one main functionality in the form of wireless energy transmission, in particular in the wireless power supply of installation units. In an advantageous embodiment, the induction energy transfer system is configured as an induction cooking system with at least one further main function that differs from a purely cooking function, in particular at least one power supply and the operation of small household appliances. For example, the induction energy transfer system could be configured as an induction oven system and / or as an induction grill system.

[0009] 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.

[0010] 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 supply. 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.

[0011] A "control unit" is defined as an electronic unit designed to control and / or regulate at least the power supply unit. The control 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 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. Preferably, the control unit comprises at least one rectifier. The inverter unit includes 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, particularly 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.

[0012] A "power 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 power unit could be converted, particularly directly, into at least one other form of energy, such as heat. Alternatively or additionally, the power unit could include at least one electrical load, such as an electric motor or the like. The power unit includes at least one receiving unit with a receiving induction element for receiving the inductively supplied 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, particularly in the operating state, could each inductively receive energy, especially from the supply induction element. The mounting unit could, for example, be designed as a cooking vessel. The cooking vessel preferably has at least one food receiving chamber and, in the operating state, converts the inductively received energy, at least partially, into heat for heating food arranged in the food receiving chamber.Preferably, the cooking unit, designed as a cooking vessel, comprises 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 a temperature sensor, a stirring unit, or the like. Alternatively, the cooking unit could be a small household appliance. Preferably, the small household appliance is a portable household appliance that comprises at least the induction element and at least one functional unit that provides at least one household appliance function in an operating state.In this context, "location-independent" means that the small household appliance can be freely positioned within a household by a user, particularly without the need for tools, especially 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, in its operating state, provides at least one primary function for food preparation.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.

[0013] The 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 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.

[0014] Preferably, the induction energy transfer system includes at least one mounting plate for the mounting unit. A "mounting plate" is understood to mean at least one, in particular plate-like, unit designed for mounting at least one mounting unit and / or for placing at least one food item on it. The mounting plate could, for example, be designed as a work surface, in particular a kitchen work surface, or as a section of at least one work surface, in particular at least one kitchen work surface, and in particular of the induction energy transfer system. Alternatively or additionally, the mounting 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. For example, the mounting plate could 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 in its assembled state, unless explicitly stated otherwise. In the assembled state, the supply unit is preferably located below the mounting plate.

[0015] Preferably, the induction energy transfer system comprises a communication unit. The communication unit is preferably designed for bidirectional wireless data transmission, i.e., for both wireless reception and wireless transmission of data between the control unit and the installation unit. Preferably, the communication unit has at least one communication element that is connected to the control unit and is specifically designed for wireless reception and transmission of data. Preferably, the communication unit has at least one further communication element that is arranged within the installation unit and is specifically designed for wireless reception and transmission of data.The communication unit could be configured for wireless data transmission between the installation unit and the control 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 unit via NFC. Preferably, the control unit is configured to wirelessly receive at least one parameter of the parameter set from the installation unit via the communication unit.

[0016] A "parameter set" is understood to mean a plurality of at least two parameters which the control unit uses to control the power supply and by means of which the control unit controls the energy inductively provided 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 induction energy transfer system. The parameter set preferably includes at least one constant constructive and / or geometric characteristic of the power 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.Preferably, at least one parameter of the operating 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 operating 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.

[0017] The control unit can be designed to calculate the correction factor. It is also conceivable that the control unit is designed to derive the correction factor from data stored within the storage unit, for example, stored measurement data or the like. Preferably, the control unit is designed to determine several correction factors for different parameters of the parameter set, preferably for each time-varying parameter of the parameter set.

[0018] In this document, numerical prefixes such as "first" and "second" serve solely to distinguish between objects and / or to indicate 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".

[0019] 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.

[0020] Furthermore, it is proposed that the control unit be designed to determine at least one coupling factor between the receiving induction element and the supply induction element in order to determine the correction factor. This advantageously allows for a sufficiently accurate determination of the correction factor using simple technical means. The coupling factor describes a portion of the magnetic flux that is shared between the supply induction element and the receiving induction element in the operating state and can assume values ​​between 0 and 1, where a value of 1 describes ideal magnetic coupling, which is not achievable in practice due to magnetic leakage fluxes. Preferably, the control unit is designed to determine the at least one coupling factor computationally using the processing unit.

[0021] Furthermore, it is proposed that the control unit be designed to use an equivalent impedance between the power supply unit and the receiving unit to determine the correction factor. This design advantageously allows for a particularly simple and reliable determination of at least one coupling factor. The equivalent impedance between the power supply unit and the receiving unit describes the total impedance of a hypothetical common electrical circuit of the receiving unit and the power supply unit during inductive energy transfer from the power supply induction element to the receiving induction element. Preferably, the control unit is designed to measure the equivalent impedance in the operating state at a primary circuit comprising the power supply induction element, and the control unit may include appropriate measuring devices for this purpose.

[0022] Furthermore, it is proposed that the control unit be designed to determine an equivalent resistance from the real part of the equivalent impedance. This advantageously allows for a further improvement in the determination of at least one coupling factor. The equivalent resistance describes the ohmic components of the total impedance of the hypothetical common electrical circuit of the receiving unit and the supply unit during inductive energy transfer from the supply induction element to the receiving induction element.

[0023] Furthermore, it is proposed that the control unit be designed to determine an equivalent inductance from the imaginary part of the equivalent impedance. This advantageously allows for a further improvement in the determination of at least one coupling factor. The equivalent inductance describes the inductive components of the total impedance of the hypothetical common electrical circuit of the receiving unit and the supply unit during inductive energy transfer from the supply induction element to the receiving induction element.

[0024] Furthermore, it is proposed that the control unit be designed to determine a first coupling factor between the supply unit and the receiving unit from the equivalent resistance. This advantageously enables a particularly simple and reliable determination of the first coupling factor. It is further proposed that the control unit be designed to determine a second coupling factor between the supply unit and the receiving unit from the equivalent inductance. This advantageously enables a particularly simple and reliable determination of the second coupling factor. Finally, it is proposed that the control unit be designed to determine the correction factor by comparing the first and second coupling factors. This advantageously enables a particularly simple, fast, and reliable determination of at least one correction factor.

[0025] In a further advantageous embodiment, it is proposed that the control unit be designed to use at least one transformer equation to calculate a coupling factor. Such a design advantageously provides an alternative or additional method for determining the at least one coupling factor. Preferably, the control unit is designed to use at least one first transformer equation, comprising a primary side of a hypothetical transformer including the supply induction element, and at least one second transformer equation, comprising a secondary side of the hypothetical transformer including the receiving induction element, to calculate a coupling factor.

[0026] Furthermore, it is proposed that the control unit be designed to take into account a vertical distance between the supply induction element and the receiving induction element when determining the correction factor. This would advantageously enable a particularly accurate determination of the correction factor and thus particularly efficient and reliable operation. The control unit could be designed to calculate the vertical distance.For example, a vertical distance between the supply induction element and the mounting plate could be stored in the storage unit, and the mounting unit could wirelessly transmit a vertical distance between the receiving induction element and a lower edge of the mounting plate to the control unit via the communication unit, whereby the control unit could determine the vertical distance between the supply induction element and the receiving induction element by adding the aforementioned distances.It is also conceivable that the storage unit contains measured values ​​that include a correlation between at least one coupling factor and various vertical distances between the supply induction element and the receiving induction element, whereby the control unit can determine a current vertical distance between the supply induction element and the receiving induction element from the previously determined coupling factor. Furthermore, the control unit can be designed to take into account a horizontal displacement between a geometric center point of the supply induction element and a geometric center point of the receiving induction element when determining the correction factor.

[0027] Furthermore, it is proposed that the control unit be designed to take into account the magnetic permeability of a magnetic flux-focusing element of the power supply unit and / or receiving unit when determining the correction factor. This can advantageously further improve the accuracy of the correction factor determination. Preferably, the magnetic permeability of the magnetic flux-focusing element of the power supply unit is stored in the storage unit. Preferably, the control unit is designed to wirelessly receive the magnetic permeability of the magnetic flux-focusing element of the receiving unit from the installation unit.

[0028] Furthermore, it is proposed that the parameter set include the self-inductance of the supply induction element. This allows an important parameter of the parameter set for controlling the supply unit, which can be subject to strong fluctuations during operation, to be advantageously considered and corrected using the correction factor. This can thus advantageously enable particularly efficient operation. It is also proposed that the parameter set include the self-inductance of the receiving induction element. With such a design, another important parameter of the parameter set, which can also be subject to strong fluctuations during operation, can be advantageously used in controlling the supply unit and corrected using the correction factor, thereby advantageously improving efficiency even further.Furthermore, it is proposed that the parameter set include a mutual inductance between the supply induction element and the receiving induction element. Including a mutual inductance between the supply and receiving induction elements in the parameter set can advantageously improve the accuracy of the supply unit's control and further enhance the efficiency of the induction energy transfer system.

[0029] The invention further relates to a method for operating an induction energy transmission system, in particular according to one of the previously described embodiments, with a supply unit which has at least one supply induction element for the inductive provision of energy, and with at least one installation unit which has at least one receiving unit with at least one receiving induction element for receiving the inductively provided energy, wherein a parameter set is used to control the supply unit and at least one parameter of the parameter set is received by the installation unit.

[0030] It is proposed that at least one correction factor be determined for at least one parameter of the parameter set. Such a method can advantageously enable a particularly user-friendly, efficient, and safe operation of the induction energy transfer system.

[0031] 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.

[0032] Further advantages become apparent from the following drawing description. The drawing illustrates an embodiment of the invention. The drawing, the description, and the claims contain numerous features in combination. They show:

[0033] Fig. 1 An induction energy transfer system with a supply unit, a control unit for controlling the supply unit, a mounting unit and another mounting unit, each comprising a receiving unit, in a schematic representation; Fig. 2 A schematic block diagram illustrating the operation of the control unit; Fig. 3 A schematic electrical equivalent circuit illustrating inductive energy transfer between a supply induction element of the supply unit and a receiving induction element of the mounting unit; Fig. 4 A schematic electrical T-equivalent circuit of the schematic electrical equivalent circuit from the Figure 3Fig. 5 four schematic diagrams illustrating influencing factors on parameters of a parameter set which the control unit uses in an operating state to control the supply unit, Fig. 6 a schematic representation of the supply element of the supply unit and a receiving induction element of the further installation unit together with a magnetic flux bundling element of the supply unit and a magnetic flux bundling element of the receiving unit of the further installation unit, Fig. 7 two schematic diagrams illustrating further influencing factors on the parameters of the parameter set and Fig. 8 a schematic process flow diagram of a method for operating the induction energy transfer system.

[0034] Figure 1Figure 1 shows a schematic representation of an induction energy transfer system 10. The induction energy transfer system 10 has a power supply unit 12. The power supply unit 12 has at least one power supply induction element 14 for the inductive provision of energy. In this case, the power supply unit 12 comprises a total of four power supply induction elements 14, although any other number would be conceivable.

[0035] The induction energy transfer system 10 comprises a mounting unit 18. The mounting unit 18 has a receiving unit 22 with a receiving induction element 24 for receiving the energy inductively supplied by the power supply unit 12. In this case, the mounting unit 18 is configured as a small household appliance 62, specifically a food processor. The induction energy transfer system 10 also comprises a further mounting unit 20. This further mounting unit 20 also includes a receiving unit 22 with a receiving induction element 24 for receiving the energy inductively supplied by the power supply unit 12. This further mounting unit 20 is configured as another small household appliance 64, specifically a kettle.

[0036] The induction energy transmission system 10 has a control unit 16 for controlling the supply unit 12. The control unit 16 is designed to provide a parameter set 36 (see figure) for controlling the supply unit 12. Figure 2 ) to use and at least one parameter 26 (see Figure 2 ) of parameter set 36 to be received from the recording unit 22.

[0037] The induction energy transfer system 10 has a mounting plate 58 for mounting the mounting unit 18, 20.

[0038] The induction energy transfer system 10 is designed in this case as an induction cooking system and comprises an induction cooktop 60. In this case, the mounting plate 58 is designed as a cooktop plate of the induction cooktop 60.

[0039] The induction energy transmission system 10 includes a communication unit 66. The communication unit 66 is designed for wireless data transmission between the installation unit 18 and the control unit 16. In this case, the communication unit 66 is also designed for wireless data transmission between the additional installation unit 20 and the control unit 16. The communication unit 66 includes a communication element 68, which is connected to the control unit 16 and is designed for wireless transmission and reception of data. The communication unit 66 includes a further communication element 70, which is located in the installation unit 18 and is designed for wireless transmission and reception of data. The communication unit 66 also includes a further communication element 72, which is located in the additional installation unit 20 and is designed for wireless transmission and reception of data.In the present case, the communication unit 66 is designed as an NFC communication unit and is intended for wireless data transmission via NFC between the control unit 16 and the installation unit 18 and / or the further installation unit 20.

[0040] Figure 2 Figure 1 shows a schematic block diagram illustrating the operation of the control unit 16. The control unit 16 comprises a storage unit 198 and a computing unit 200. The control unit 16 also includes an inverter unit 202 for controlling and supplying power to the power supply unit 12.

[0041] In an operating state of the induction energy transmission system 10, the control unit 16 wirelessly receives at least one parameter 26 from the installation unit 18 via the communication element 68 of the communication unit 66 and stores it in the storage unit 198. The storage unit 198 of the control unit 16 also stores further parameters 28 and 30 of the parameter set 36. The parameter set 36 includes an intrinsic inductance 52 of the supply induction element 14. The parameter set 36 also includes an intrinsic inductance 54 of the receiving induction element 24. Furthermore, the parameter set 36 includes a mutual inductance 56 between the supply induction element 14 and the receiving induction element 24. For example, the parameter 26 received wirelessly by the receiving unit 18 could be the intrinsic inductance 54 of the receiving induction element 24.The additional parameter 28 could, for example, be the self-inductance 52 of the supply induction element 14. In addition to parameters 26, 28, and 30, parameter set 36 can include further parameters (not shown), which are also stored in the storage unit 198 and / or can be wirelessly received by the control unit 16 from the installation unit 18 via the communication element 68. Furthermore, the processing unit 200 can be designed to calculate some of the additional parameters of parameter set 36 from other parameters, such as parameters 26, 28, and 30.

[0042] The control unit 16 is designed to determine at least one correction factor 38 for at least one parameter 26, 28, 30 of the parameter set 36. The determination of the at least one correction factor 38 is carried out by means of the arithmetic unit 200.

[0043] The control unit 16 is designed to determine at least one coupling factor 32, 34, 42 between the receiving induction element 24 and the supply induction element 14 in order to determine the correction factor 38.

[0044] Figure 3 Figure 1 shows a simplified schematic electrical circuit diagram illustrating inductive energy transfer between the supply induction element 14 of the supply unit 12 and the receiving induction element 24 of the receiving unit 22 of the mounting unit 18, which are arranged at a vertical distance 44 from each other. Part of the supply unit 12 is located in the Figure 3The primary circuit 90 is represented as a primary circuit. Besides the supply induction element 14, the primary circuit 90 comprises a compensation capacitor 74 and an electrical resistor 76. The primary circuit 90 also includes an AC voltage source 78, which is connected in series with the compensation capacitor 74, the supply induction element 14, and the electrical resistor 76. The electrical resistor 76 represents the electrical losses during operation of the primary circuit 90. At least one inverter (not shown) of the inverter unit 202 (see Figure 1) is also included. Figure 2 ) can be considered the AC voltage source 78 in the primary circuit 90.

[0045] The recording unit 22 of the setup unit 18 is in the Figure 3The secondary circuit 92 is represented as a secondary circuit comprising the receiving induction element 24, a compensation capacitor 80 connected in series with it, and an electrical resistor 82. The electrical resistor 82 represents the total electrical load in an operating state of the installation unit 18, assuming a purely resistive load for simplicity. Of course, the induction energy transfer system 10 would also be suitable for operating installation units with a total electrical load composed of resistive, capacitive, and / or inductive loads, since these loads can be converted into an equivalent purely resistive load by the processing unit 200 of the control unit 16.

[0046] The in Figure 3 The schematic equivalent electrical circuit shown can be considered a two-port network in network theory. Figure 4shows a schematic T-equivalent circuit of a two-port network of the type in the Figure 2 schematic electrical equivalent circuit diagram shown.

[0047] The control unit 16 is designed to use a substitute impedance 40 between the supply unit 12 and the receiving unit 22 to determine at least one correction factor 38. The substitute impedance 40 describes a total impedance of the primary circuit 90 and the secondary circuit 92 of the [unclear text]. Figure 3 The simplified equivalent circuit diagram shown represents an inductive energy transfer between the supply induction element 14 of the supply unit 12 and the receiving induction element 24 of the receiving unit 22. In the T-equivalent circuit diagram of the Figure 4 The equivalent impedance 40 is composed of an equivalent impedance 84 for the primary circuit 90, an equivalent impedance 86 for the secondary circuit 92 and an equivalent impedance 88, which represents the mutual inductance 56 (see Figure 2 ) between the supply induction element 14 and the receiving induction element 24 during inductive energy transfer, together.

[0048] The inductive energy transfer between the supply induction element 14 and the receiving induction element 24 can be modeled by the computing unit 200 of the control unit 16 using the following system of equations (1): Z 11 Z 12 Z 21 Z 22 I 1 I 2 = V 0 , where Z11 represents the self-impedance of the primary circuit 90, Z22 the self-impedance of the secondary circuit 92, Z12 a back EMF induced in the receiving induction element 24 by the supply induction element 14 during inductive energy transfer, and Z21 a back EMF induced in the supply induction element 14 by the receiving induction element 24 during inductive energy transfer. Furthermore, I1 represents an alternating current flowing through the supply induction element 14 in the primary circuit 90 during the operating state, I2 represents an alternating current flowing through the receiving induction element 24 in the secondary circuit 92, and V represents the alternating voltage provided by the AC voltage source 78. Since the back EMFs Z12 and Z21 have the same magnitude, the system of equations (1) can be simplified to the system of equations (1') as follows: Z 11 Z 12 Z 12 Z 22 I 1 I 2 = V 0 ,

[0049] Furthermore, the relationships shown in equations (2) to (5) below apply, neglecting winding losses of the supply induction element 14 and the receiving induction element 24 as well as heat losses: Z 11 = jωL 11 − j 1 ωC 1 , Z 12 = jωL 12 , Z 22 = R Load + jωL 22 − j 1 ωC 2 , ω = 2 πf

[0050] In equations (2) to (5) j represents the imaginary unit, ω the angular frequency, L 11 the self-inductance 52 (cf. Figure 2 ) of the supply induction element 14, C 1 for the capacitance of the capacitor 74 in the primary circuit 90 (cf. Figure 3 ), L 22 for the self-inductance 54 (cf. Figure 2 ) of the receiving induction element 24, L 12 for the mutual inductance 56 (cf. Figure 2 ), R Load for the electrical resistance 82 and C 2 for the capacitance of the compensation capacitor 80 in the secondary circuit 92 (see Figure 3 ), π for the circle constant and f for the frequency of the alternating voltage source 78 (see. Figure 3) supplied alternating current.

[0051] As explained above, the control unit 16 is designed to determine the substitute impedance 40 (see above) in order to determine the correction factor 38. Figure 4 ) between the supply unit 12 and the receiving unit 22. The equivalent impedance 40 can be determined by the control unit 16 by measuring the primary circuit 90. Using Kirchhoff's laws, the following equation (6) can be derived for the equivalent impedance 40: Z eq = V I 1 = Z 11 − Z 12 2 Z 22 . where in equation (6) the symbol Z eq stands for the equivalent impedance 40.

[0052] For the calculation of at least one coupling factor 32, 34, this can be done in the Figure 3 simplified electrical equivalent circuit diagram shown, or alternatively the one in Figure 4 schematic T-equivalent circuit diagram of the two-port network shown in the Figure 3The simplified equivalent electrical circuit diagram shown can be used. The equivalent impedance 40 describes the total impedance of the primary circuit 90 and the secondary circuit 92 of the circuit shown in the diagram. Figure 3 The simplified equivalent circuit diagram shown represents an inductive energy transfer between the supply induction element 14 of the supply unit 12 and the receiving induction element 24 of the receiving unit 22. Figure 3 where the equivalent impedance 84 represents the difference between the self-impedance Z 11 of the primary circuit 90 and the mutual inductance Z 12, the equivalent impedance 86 the difference between the self-impedance Z 22 of the secondary circuit 92 and the mutual inductance Z 12, and the equivalent impedance 88 the mutual inductance Z 12, so that the above equation (6) can alternatively be derived directly from the T equivalent circuit diagram instead of using Kirchhoff's rules.

[0053] Furthermore, the equivalent impedance 40 is a complex quantity and can therefore also be represented in the form of the following equation (7): Z eq = R eq + jωL eq − j 1 ωC 1 . where Z eq is the equivalent impedance 40, R eq is an equivalent resistance (not shown) and L eq is an equivalent inductance (not shown) of the in the Figures 3 and 4 The schematic circuits shown are available.

[0054] The control unit 16 is designed to determine the equivalent resistance Req from the real part of the equivalent impedance 40. From equation (7), using equations (2), (3), (4), and (6), the following equation (8) for determining the equivalent resistance Req can be derived: R eq = ω 2 L 12 2 R load R load 2 + ωL 22 − 1 ωC 2 2 ,

[0055] The control unit 16 is further designed to determine the equivalent inductance L eq from the imaginary part of the equivalent impedance 40. From equation (7), using equations (2), (3), (4), (6), the following equation (9) for determining the equivalent inductance can be derived: L eq = L 11 − ωL 12 2 ωL 22 − 1 ωC 2 R load 2 + ωL 22 − 1 ωC 2 2 .

[0056] The control unit 16 is designed to determine a first coupling factor 32 between the supply unit 12 and the receiving unit 22 from the equivalent resistance Req. The control unit 16 is also designed to determine a second coupling factor 34 between the supply unit 12 and the receiving unit 22 from the equivalent inductance Leq. The following relationship exists between the self-inductance L11 of the supply inductance element 14, the self-inductance L22 of the receiving inductance element 24, the mutual inductance L12, and the first coupling factor 32 and the second coupling factor 34, respectively, as shown in equation (10) below: L 12 = k L 11 L 22 . where k generally represents one of the coupling factors 32, 34. By substituting equation (10) into equation (8) and solving for k, the first coupling factor 32 can be determined from the equivalent resistance R eq using the following equation (11): k R eq = R eq R load 2 + ωL 22 − 1 ωC 2 2 ω 2 L 11 L 22 R load , where k Req represents the first coupling factor 32. By substituting equation (10) into equation (9) and solving for k, the second coupling factor 34 can be determined from the equivalent inductance L eq using the following equation (12): k L eq = L 11 − L eq R load 2 + ωL 22 − 1 ωC 2 2 ωL 11 L 22 ωL 22 − 1 ωC 2 . where k Leq represents the second coupling factor 34.

[0057] The control unit 16 is designed to determine the correction factor 38 by comparing the first coupling factor 32 and the second coupling factor 34. As can be seen from equation (11), the coupling factors 32 and 34 establish a relationship between the self-inductance L11 of the supply inductor 14, the self-inductance L22 of the receiving inductor 24, and the mutual inductance L12. In general, the coupling factors 32 and 34 describe a portion of the magnetic flux that is shared by the supply inductor 14 and the receiving inductor 24 in the operating state. The coupling factors 32 and 34 can take values ​​between 0 and 1, where a value of 1 would represent ideal magnetic coupling. In practice, however, magnetic leakage losses occur, so the values ​​of the coupling factors 32 and 34 are less than 1.In theory, the first coupling factor 32, which can be determined from equation (12), and the second coupling factor 34, which can be determined from equation (13), should assume identical values ​​for all frequencies f of the alternating voltage provided by the AC voltage source 78. However, investigations by the applicant have shown that the first coupling factor 32 and the second coupling factor 34 differ from each other in practice. The present invention takes advantage of this fact by having the control unit 16 compare the first coupling factor 32 with the second coupling factor 34 in the operating state in order to determine the at least one correction factor 38.Investigations by the applicant have shown that the first coupling factor 32 changes only slightly with changes in the self-inductance 52 of the supply inductance element 14, the self-inductance 54 of the receiving inductance element 24, and the mutual inductance 56, whereas the second coupling factor 34 shows a greater variance with the same changes. If the second coupling factor 34 determined by the control unit 16 in the operating state is greater than the determined first coupling factor 32, the control unit 16 concludes that the values ​​of the self-inductance 52 of the supply inductance element 14, the self-inductance 54 of the receiving inductance element 24, and the mutual inductance 56 stored in the storage unit 198 are too high, and the control unit 16 corrects these parameters of the parameter set 36 downwards by means of at least one correction factor 38.If the second coupling factor 34 determined by the control unit 16 in the operating state is smaller than the determined first coupling factor 32, the control unit 16 concludes that the values ​​of the self-inductance 52 of the supply inductance element 14, the self-inductance 54 of the receiving inductance element 24, and the mutual inductance 56 stored in the storage unit 198 are too low, and the control unit 16 corrects these parameters of the parameter set 36 upwards using at least one correction factor 38. For example, different values ​​for the at least one correction factor 38 can be stored in the storage unit 198 in relation to a difference between the first coupling factor 32 and the second coupling factor 34.Alternatively or additionally, the storage unit 198 of the control unit 16 can also store an algorithm executable by the computing unit 200, by means of which relatively accurate estimates of the self-inductance 52 of the supply inductance element 14, the self-inductance 54 of the receiving inductance element 24, and the mutual inductance 56 can be derived from the first coupling factor 32 and the second coupling factor 34, for example, using numerical methods. It is also conceivable that the control unit 16 varies the values ​​of at least one correction factor 38 until the values ​​of the first coupling factor 32 and the second coupling factor 34 approximate each other with sufficient accuracy.

[0058] The control unit 16 is further designed to use at least one transformer equation to calculate at least one coupling factor 42. The calculation of the coupling factor 42 can be performed alternatively or additionally to the calculation of the first coupling factor 32 and the second coupling factor 34. For this purpose, the supply induction element 14 can be considered the primary side of a transformer and the receiving induction element 14 the secondary side of the transformer. A first transformer equation (13) for the primary side is expressed in differential form as follows: V p = L p dI p dt + M ps dI s dt where Vp is the alternating voltage provided by the AC voltage source 78 in the operating state, Lp is the self-inductance 52 of the supply induction element 14, Ip is an alternating current flowing through the supply induction element 14 in the operating state, Mps is the mutual inductance 56 between the supply induction element 14 and the receiving induction element 24, Is is an alternating current flowing through the receiving induction element 24 in the operating state, and t is the time.

[0059] A second transformer equation (14) for the secondary side is expressed in differential form as follows: 0 = L s dI S dt + M ps dI p dt + Z I s where Ls represents the self-inductance 54 of the recording inductance element 24 and Z represents an equivalent impedance from the electrical resistance 82 and the

[0060] Compensation capacitor 80 of the secondary circuit 92 (see Figure 3 ). The following equation (15) applies to the equivalent impedance Z: Z = R s + 1 C s s where Rs represents the value of the electrical resistance 82, Cs the capacitance of the compensation capacitor 80, and s a complex frequency parameter for a Laplace transform. The following equation (16) applies to the complex frequency parameter s: s = jω = j 2 πf where j is the imaginary unit, ω is the angular frequency, π is the number of pi and f is the frequency of the alternating voltage source 78 (see Figure 3 ) supplied alternating voltage. Furthermore, the resonant frequency ω r can be determined according to the following equation (17): ω r = 1 L p L s

[0061] Furthermore, the time constant τ s can be introduced according to equation (18): τ s = L s R s

[0062] For the coupling factor 42, the following equation (19) applies analogously to the equation (19) above: k = M ps L p L s where k represents the coupling factor 42.

[0063] A substitute impedance Z p for the primary side can be determined using the following equation (20): Z p = L p s τ s − k 2 τ s s 2 + s + τ s ω r 2 τ s s 2 + s + τ s ω r 2

[0064] An equivalent resistance R eq can be calculated using the following equation (21): R eq = L p τ s k 2 ω 2 τ s 2 ω 4 − 2 τ s 2 ω 2 ω r 2 + τ s 2 ω r 2 + ω 2

[0065] The coupling factor 42 can be determined by the control unit 16 using equations (13) to (21) from equation (22) as follows: k = R eq τ s 2 ω 4 − 2 τ s 2 ω 2 ω r 2 + τ s 2 ω r 2 + ω r L p τ s ω 4

[0066] The determination of the coupling factor 42 can, for example, also be used by the control unit 16 to control the supply unit 12 for the inductive provision of energy to the receiving unit 22 of the further installation unit 20 (see Figure 1 ) are used.

[0067] Figure 5shows four schematic diagrams to represent theoretical values ​​and measured values ​​of the self-inductance 52 of the supply induction element 14, the self-inductance 54 of the receiving induction element 24, the mutual inductance 56 between the supply induction element 14 and the receiving induction element 24, as well as coupling factors determined from the theoretical values ​​and the measured values.

[0068] On an ordinate 94 of an upper left diagram of the Figure 5An inductance is plotted in microhenries. On an abscissa 96 of the upper left diagram, the frequency f of the alternating voltage supplied by the AC voltage source 78 is plotted in hertz. A straight line 98 shows the theoretical value of the self-inductance 52 of the supply inductor element 14, which in theory should be constant over the entire frequency range. In practice, however, considerable deviations occur in the measured values ​​of the self-inductance 52 of the supply inductor element 14 from a frequency of approximately 10⁻⁵ hertz, which also depend, among other things, on a vertical distance 44 (see figure). Figure 3The self-inductance 52 can vary between the supply induction element 14 and the receiving induction element 24. A first measurement curve 100 in the upper left diagram shows measured values ​​of the self-inductance 52 for a vertical distance 44 of 0.7 millimeters. A second measurement curve 102 in the upper left diagram shows measured values ​​of the self-inductance 52 for a vertical distance 44 of 6.6 millimeters. A third measurement curve 104 in the upper left diagram shows measured values ​​of the self-inductance 52 for a vertical distance 44 of 10.8 millimeters. A fourth measurement curve 106 in the upper left diagram shows measured values ​​of the self-inductance 52 for a vertical distance 44 of 20.8 millimeters. A fifth measurement curve 108 in the upper left diagram shows measured values ​​of the self-inductance 52 for a vertical distance 44 of 30.9 millimeters.A sixth measurement curve 110 in the upper left diagram shows measured values ​​of the self-inductance 52 for a vertical distance 44 of 40.7 millimeters.

[0069] On an ordinate 112 of an upper right diagram of the Figure 5An inductance is plotted in microhenries. On an abscissa 114 of the upper right diagram, the frequency f of the alternating voltage provided by the AC voltage source 78 is plotted in hertz. A first straight line 116 shows the theoretical value of the self-inductance 54 of the recording inductor 24 for a vertical distance 44 of 0.7 millimeters, which in theory should be constant over the entire frequency range. In practice, however, considerable deviations occur for the self-inductance 54 of the recording inductor 24 from a frequency of approximately 105 hertz, which are shown in a first measurement curve 118 in the lower left diagram.A second straight line 120 shows the theoretical value of the self-inductance 54 of the receiving inductance element 24 for a vertical distance 44 of 6.6 millimeters, wherein a second measurement curve 122 for the vertical distance 44 of 6.6 millimeters deviates from the second straight line 120 with increasing frequency in the range between 10⁵ < Hertz and 10⁶ < Hertz. A third straight line 124 shows the theoretical value of the self-inductance 54 of the receiving inductance element 24 for a vertical distance 44 of 10.8 millimeters, wherein a third measurement curve 126 for the vertical distance 44 of 10.8 millimeters deviates from the third straight line 124 with increasing frequency in the range between 10⁵ < Hertz and 10⁶ < Hertz.A fourth straight line 128 shows the theoretical value of the self-inductance 54 of the receiving inductance element 24 for a vertical distance 44 of 20.8 millimeters, wherein a fourth measurement curve 130 for the vertical distance 44 of 20.8 millimeters deviates from the fourth straight line 128 with increasing frequency in the range between 10⁵ < Hertz and 10⁶ < Hertz. A fifth straight line 132 shows the theoretical value of the self-inductance 54 of the receiving inductance element 24 for a vertical distance 44 of 30.9 millimeters, wherein a fifth measurement curve 134 for the vertical distance 44 of 30.9 millimeters deviates from the fifth straight line 132 with increasing frequency in the range between 10⁵ < Hertz and 10⁶ < Hertz.A sixth straight line 136 shows the theoretical value of the self-inductance 54 of the recording induction element 24 for a vertical distance 44 of 40.7 millimeters, wherein a sixth measurement curve 138 for the vertical distance 44 of 40.7 millimeters deviates from the sixth straight line 136 with increasing frequency in the range between 10 5< Hertz and 10 6< Hertz.

[0070] On an ordinate 140 of a lower left diagram of the Figure 5An inductance is plotted in microhenries. On an abscissa 142 of the upper left diagram, the frequency f of the alternating voltage supplied by the AC voltage source 78 is plotted in hertz. A first straight line 144 shows a theoretical value of the mutual inductance 56 between the supply inductor element 14 and the receiving inductor element 24 for a vertical distance 44 of 0.7 millimeters, which in theory should be constant over the entire frequency range. In practice, however, considerable deviations occur for the mutual inductance 56 from a frequency of approximately 10⁻⁵ hertz, which are shown in a first measurement curve 146 in the lower left diagram.A second straight line 148 shows the theoretical value of the mutual inductance 56 for a vertical distance 44 of 6.6 millimeters, wherein a second measurement curve 150 for the vertical distance 44 of 6.6 millimeters deviates from the second straight line 148 with increasing frequency in the range between 10⁵ < Hertz and 10⁶ < Hertz. A third straight line 152 shows the theoretical value of the mutual inductance 56 for a vertical distance 44 of 6.6 millimeters, wherein a third measurement curve 154 for the vertical distance 44 of 6.6 millimeters deviates from the second straight line 148 with increasing frequency in the range between 10⁵ < Hertz and 10⁶ < Hertz. A fourth straight line 156 shows the theoretical value of the mutual inductance 56 for a vertical distance 44 of 20.8 millimeters, wherein a fourth measurement curve 158 for the vertical distance 44 of 20.8 millimeters deviates from the fourth straight line 156 with increasing frequency in the range between 10 5< Hertz and 10 6< Hertz.A fifth straight line 160 shows the theoretical value of the mutual inductance 56 for a vertical distance 44 of 30.9 millimeters, wherein a fifth measurement curve 162 for the vertical distance 44 of 30.9 millimeters deviates from the fifth straight line 160 with increasing frequency in the range between 10⁵ < Hertz and 10⁶ < Hertz. A sixth straight line 164 shows the theoretical value of the mutual inductance 56 for a vertical distance 44 of 40.7 millimeters, wherein a sixth measurement curve 166 for the vertical distance 44 of 40.7 millimeters deviates from the sixth straight line 164 with increasing frequency in the range between 10⁵ < Hertz and 10⁶ < Hertz.

[0071] On an ordinate 168 of a lower right diagram of the Figure 5A dimensionless coupling factor is plotted. On an abscissa 142 of the lower right diagram, the frequency f of the alternating voltage provided by the AC voltage source 78 is plotted in Hertz. A first straight line 172 in the lower right diagram shows a theoretical coupling factor between the supply inductor 14 and the receiving inductor 24 at a vertical distance 44 of 0.7 millimeters, which is constant over the entire frequency range. A first curve 174 shows calculated values ​​for a coupling factor derived from the measured values ​​for the self-inductance 52 of the supply inductor 14, the self-inductance 54 of the receiving inductor 24, and the mutual inductance 56 for a distance 44 of 0.7 millimeters.A second straight line 176 in the lower right diagram shows a theoretical coupling factor between the supply induction element 14 and the receiving induction element 24 at a vertical distance 44 of 6.6 millimeters, which is constant over the entire frequency range. A second curve 178 shows calculated values ​​for a coupling factor derived from the measured values ​​for the self-inductance 52 of the supply induction element 14, the self-inductance 54 of the receiving induction element 24, and the mutual inductance 56 for a vertical distance 44 of 6.6 millimeters. A third straight line 180 in the lower right diagram shows a theoretical coupling factor between the supply induction element 14 and the receiving induction element 24 at a vertical distance 44 of 10.8 millimeters, which is constant over the entire frequency range.A third curve 182 shows calculated values ​​for a coupling factor derived from the measured values ​​for the self-inductance 52 of the supply inductance element 14, the self-inductance 54 of the receiving inductance element 24, and the mutual inductance 56 for a vertical distance 44 of 10.8 millimeters. A fourth straight line 184 in the lower right diagram shows a theoretical coupling factor between the supply inductance element 14 and the receiving inductance element 24 at a vertical distance 44 of 20.8 millimeters, which is constant over the entire frequency range. A fourth curve 186 shows calculated values ​​for a coupling factor derived from the measured values ​​for the self-inductance 52 of the supply inductance element 14, the self-inductance 54 of the receiving inductance element 24, and the mutual inductance 56 for a vertical distance 44 of 20.8 millimeters.A fifth straight line 188 in the lower right diagram shows a theoretical coupling factor between the supply induction element 14 and the receiving induction element 24 at a vertical distance 44 of 30.9 millimeters, which is constant over the entire frequency range. A fifth curve 190 shows calculated values ​​for a coupling factor derived from the measured values ​​for the self-inductance 52 of the supply induction element 14, the self-inductance 54 of the receiving induction element 24, and the mutual inductance 56 for a vertical distance 44 of 30.9 millimeters. A sixth straight line 192 in the lower right diagram shows a theoretical coupling factor between the supply induction element 14 and the receiving induction element 24 at a vertical distance 44 of 40.7 millimeters, which is constant over the entire frequency range.A sixth curve 194 shows calculated values ​​for a calculated coupling factor from the measured values ​​for the self-inductance 52 of the supply induction element 14, the self-inductance 54 of the receiving induction element 24 and the mutual inductance 56 for a vertical distance 44 of 40.7 millimeters.

[0072] Figure 6 Figure 1 shows a schematic representation of the supply element 14 and the receiving induction element 24 of the receiving unit 22 of the further installation unit 20 together with a magnetic flux bundling element 48 of the supply unit 12 and a magnetic flux bundling element 50 of the receiving unit 22. Figure 6A vertical distance 46 between the supply induction element 14 and the receiving induction element 24 is shown. The control unit 16 is designed to take the vertical distance 44 between the supply induction element 14 and the receiving induction element 24 into account when determining the correction factor 38. Various measured values ​​for coupling factors 32, 34, 42 for different vertical distances 44 between the supply induction element 14 and the receiving induction element 24, for example those shown in Figure 5 The displayed measured values ​​and / or other measured values ​​may be stored.

[0073] The control unit 16 is designed to take into account, when determining the correction factor 38, a magnetic permeability (not shown) of the magnetic flux bundling element 48 of the supply unit 12 and / or of the magnetic flux bundling element 50 of the receiving unit 22.

[0074] Figure 7 The figure shows two schematic diagrams illustrating the influence of factors on parameters 26, 28, and 30 of parameter set 36, which were determined by the applicant in the context of measurement series. On a left ordinate 204 of an upper diagram of the Figure 7An inductance is plotted in Henrys. A dimensionless magnetic permeability is plotted on an abscissa 206 of the upper diagram. The dimensionless coupling factor 42 is plotted on a right ordinate 208 of the upper diagram. A first curve 210 shows the course of the coupling factor 42 as a function of the magnetic permeability. A second curve 212 shows the course of the self-inductance 52 of the supply induction element 14 and a self-inductance (not shown) of the receiving induction element 24 of the receiving unit 22 of the further mounting unit 20 as a function of the magnetic permeability, whereby the self-inductance 52 of the supply induction element 14 and the self-inductance of the receiving induction element 24 have the same values.

[0075] On a left ordinate 214 of a lower diagram of the Figure 7The inductance is plotted in Henrys. On an abscissa 216 of the lower diagram, the vertical distance 46 in meters is plotted. On a right ordinate 218 of the lower diagram, the dimensionless coupling factor 42 is plotted. A first curve 220 in the right diagram shows the course of the coupling factor 42 as a function of the vertical distance 46. A second curve 222 in the right diagram shows the course of the self-inductance 52 of the supply inductance element 14 and the self-inductance of the receiving inductance element 24 of the receiving unit 22 of the further installation unit 20 as a function of the distance 46.

[0076] The one in Figure 7The measurement series of magnetic permeability and vertical distance 46 shown as influencing factors on inductive energy transfer can be stored in the storage unit 198 and taken into account by the control unit 16 when determining at least one correction factor 38, for example in combination with the determined coupling factor 42.

[0077] Figure 8Figure 1 shows a schematic process flow diagram of a method for operating the induction energy transmission system 10. The method comprises at least two process steps 224 and 226. In a first process step 224, at least one parameter 26 of the parameter set 36 is received from the installation unit 18 and / or the further installation unit 20, and the parameter set 36 is used to control the supply unit 12. In a second process step 226, the at least one correction factor 38 is determined for at least one of the parameters 26, 28, or 30 of the parameter set 36. Reference sign

[0078] 10 Induction energy transfer system 12 Power supply unit 14 Power supply induction element 16 Control unit 18 Mounting unit 20 Additional mounting unit 22 Receiving unit 24 Receiving induction element 26 Parameter 28 Additional parameter 30 Additional parameter 32 First coupling factor 34 Second coupling factor 36 Parameter set 38 Correction factor 40 Equivalent impedance 42 Coupling factor 44 Vertical distance 46 Vertical distance 48 Magnetic flux gathering element 50 Magnetic flux gathering element 52 Self-inductance 54 Self-inductance 56 Mutual inductance 58 Mounting plate 60 Induction cooktop 62 Small household appliance 64 Additional small household appliance 66 Communication unit 68 Communication element 70 Additional communication element 72 Additional communication element 74 Compensation capacitor 76 Electrical 78 Resistance AC voltage source 80 Compensation capacitor 82 Electrical resistance 84 Equivalent impedance 86 Equivalent impedance 88 Equivalent impedance 90 Primary circuit 92 Secondary circuit 94 Ordinate 96 Abscissa 98 Even100 first measurement curve 102 second measurement curve 104 third measurement curve 106 fourth measurement curve 108 fifth measurement curve 110 sixth measurement curve 112 ordinate 114 abscissa 116 first line 118 first measurement curve 120 second line 122 second measurement curve 124 third line 126 third measurement curve 128 fourth line 130 fourth measurement curve 132 fifth line 134 fifth measurement curve 136 sixth line 138 sixth measurement curve 140 ordinate 142 abscissa 144 first line 146 first measurement curve 148 second line 150 second measurement curve 152 third line 154 third measurement curve 156 fourth line 158 fourth measurement curve 160 fifth line 162 fifth measurement curve 164 sixth straight line 166 sixth measurement curve 168 ordinate 170 abscissa 172 first straight line 174 first curve 176 second straight line 178 second curve 180 third straight line 182 third curve 184 fourth straight line 186 fourth curve 188 fifth straight line 190 fifth curve 192 sixth straight line 194 sixth curve 198 storage unit 200 processing unit 202 inverter unit 204 left ordinate 206 abscissa 208 right ordinate 210 first curve 212 second curve 214 left ordinate216 Abscissa 218 Right ordinate 220 First curve 222 Second curve 224 First process step 226 Second process step

Claims

1. Induction energy transmission system (10), in particular induction cooking system, with a supply unit (12) which has at least one supply induction element (14) for inductively providing energy, with a control unit (16) for controlling the supply unit (12), and with at least one positioned unit (18, 20) which has at least one receiving unit (22) with at least one receiving induction element (24) for receiving the inductively provided energy, wherein the control unit (16) is provided to use a parameter set (36) to control the supply unit (12) and to receive at least one parameter (26) of the parameter set (36) from the positioned unit (18, 20), characterised in that the control unit (16) is provided to determine at least one correction factor (38) for at least one of the parameters (26, 28, 30) of the parameter set (36).

2. Induction energy transmission system (10) according to claim 1, characterised in that the control unit (16) is provided, for the determination of the correction factor (38), to determine at least one coupling factor (32, 34, 42) between the receiving induction element (24) and the supply induction element (14).

3. Induction energy transmission system (10) according to claim 1 or 2, characterised in that the control unit (16) is provided, for the determination of the correction factor (38), to use an equivalent impedance (40) between the supply unit (12) and the receiving unit (22).

4. Induction energy transmission system (10) according to claim 3, characterised in that the control unit (16) is provided to determine an equivalent resistance from the real part of the equivalent impedance (40).

5. Induction energy transmission system (10) according to claim 3 or 4, characterised in that the control unit (16) is provided to determine an equivalent inductance from the imaginary part of the equivalent impedance (40).

6. Induction energy transmission system (10) according to claim 4 or 5, characterised in that the control unit (16) is provided to determine a first coupling factor (32) between the supply unit (12) and the receiving unit (22) from the equivalent resistance.

7. Induction energy transmission system (10) according to claim 5 or 6, characterised in that the control unit (16) is provided to determine a second coupling factor (34) between the supply unit (12) and the receiving unit (22) from the equivalent inductance.

8. Induction energy transmission system (10) according to claims 6 and 7, characterised in that the control unit (16) is provided to determine the correction factor (38) from a comparison between the first coupling factor (32) and the second coupling factor (34).

9. Induction energy transmission system (10) according to one of claims 2 to 8, characterised in that the control unit (16) is provided to use at least one transformer equation for the calculation of the at least one coupling factor (42).

10. Induction energy transmission system (10) according to one of the preceding claims, characterised in that the control unit (16) is provided to take into account a vertical distance (44, 46) between the supply induction element (14) and the receiving induction element (24) in the determination of the correction factor (38).

11. Induction energy transmission system (10) according to one of the preceding claims, characterised in that the control unit (16) is provided to take into account a magnetic permeability of a magnetic flux bundling element (48, 50) of the supply unit (12) and / or receiving unit (22) in the determination of the correction factor (38).

12. Induction energy transmission system (10) according to one of the preceding claims, characterised in that the parameter set (36) comprises a self-inductance (52) of the supply induction element (14).

13. Induction energy transmission system (10) according to one of the preceding claims, characterised in that the parameter set (36) comprises a self-inductance (54) of the receiving induction element (24).

14. Induction energy transmission system (10) according to one of the preceding claims, characterised in that the parameter set (36) comprises a mutual inductance (56) between the supply induction element (14) and the receiving induction element (24).

15. Method for operating an induction energy transmission system (10), in particular according to one of claims 1 to 14, with a supply unit (12) which has at least one supply induction element (14) for inductively providing energy, and with at least one positioned unit (18, 20) which has at least one receiving unit (22) with at least one receiving induction element (24) for receiving the inductively provided energy, wherein a parameter set (36) is used to control the supply unit (12) and at least one parameter (26) of the parameter set (36) is received from the positioned unit (18, 20), characterised in that at least one correction factor (38) is determined for at least one of the parameters (26, 28, 30) of the parameter set (36).