Induction power transmission system

Abstract

The invention relates to an induction energy transmission system (10a; 10b), comprising a supply unit (12a, 12b) which has at least one supplying induction element (14a, 14b) for inductive provision of energy, at least one receiving unit (22a; 22b) which has at least one receiving induction element (24a; 24b) to receive the inductively provided energy, a switching unit (26a) which comprises at least two switching elements (28a, 30a) for providing an alternating current (32a) for the supplying induction element (14a, 14b), and a control unit (34a; 34b) for controlling the switching unit (26a). In order to provide a generic system having improved properties with regard to controlling the switching unit, the control unit (34a; 34b), in at least one operational state, adjusts at least one switching parameter (38a) of a switching parameter set (40a) of at least one of the switching elements (28a, 30a) in order to adjust a supply power (36a).

Description

[0001] The invention relates to an induction energy transmission system according to the preamble of claim 1 and a method for operating an induction energy transmission system according to the preamble of claim 11.

[0002] An induction energy transmission system is already known from the prior art, comprising a supply unit designed as a hob for inductively providing energy and a receiving unit designed as a cooking utensil with a receiving element for receiving the inductively provided energy. The cooking utensil also has at least one further functional unit, which has at least one function other than heating food and can be supplied with a portion of the energy inductively received by the receiving element. EP 3 255 958 A1, DE 10 2006 017801 A1, and KR 2019 0024547 A disclose an induction energy transmission system according to the preamble of claim 1.

[0003] The object of the invention is, in particular but not limited to, to provide a generic system with improved properties regarding the control of a switching unit. This object is achieved according to the invention by the features of claims 1 and 11, while advantageous embodiments and further developments of the invention can be found in the subclaims.

[0004] The invention is based on 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 at least one receiving unit which has at least one receiving induction element for receiving the inductively provided energy, with a switching unit which comprises at least two switching elements for providing an alternating current for the supply induction element, and with a control unit for controlling the switching unit, wherein the control unit changes the duty cycle of exclusively one of the switching elements of the switching unit in at least one operating state in order to adjust a supply power.

[0005] It is proposed that the control unit adapts at least one switching parameter of a switching parameter set of at least one of the switching elements in at least one operating state to adjust a supply power.

[0006] The design according to the invention makes it possible, in particular, to improve the control of the switching unit. In addition, energy efficiency can advantageously be improved. In particular, an improved setting of a supply power can advantageously be achieved. The supply power can advantageously be provided over a large power range, in particular evenly. This advantageously makes it possible to provide a system with an expanded range of functions, as a result of which comfort and / or an operating experience for a user can be improved. For example, additional units of the receiving unit which are inductively supplied with energy, in particular motor-driven and speed-controlled additional units, such as stirrers, can advantageously be operated more evenly, in particular due to reduced power fluctuations in the output power.Furthermore, additional units of the receiving unit which have an energy storage device can advantageously be charged particularly easily and / or gently for the energy storage device.

[0007] An "induction energy transmission system" is understood, in particular, to mean a system that has at least one supply unit and at least one receiving unit, and that has a primary functionality in the form of wireless energy transmission. For example, the induction energy transmission system could be designed as an induction handheld power tool system. In particular, the receiving unit could be designed as a handheld power tool, such as a drill and / or an electric screwdriver and / or a hammer drill and / or a saw. Alternatively or additionally, the supply unit and / or the receiving unit could each be designed as a subunit of a transformer, in particular as a primary coil and / or as a secondary coil of a transformer.The induction energy transmission system could, in particular, be provided for at least one self-propelled working device and / or for at least one remote control and / or for at least one remote control. In particular, the receiving unit could be designed as a self-propelled working device and / or as a remote control and / or as a remote control. The self-propelled working device could, for example, be designed as a self-propelled lawnmower and / or as a self-propelled vacuum cleaner. The remote control and / or the remote control could, in particular, be provided for operating and / or controlling at least one blind and / or at least one electrical appliance, in particular at least one household electrical appliance, and / or at least one model object, such as a model car and / or a model aircraft and / or a model boat.Furthermore, the receiving unit of the induction energy transmission system could be designed as a means of transport, in particular as an electric motor vehicle or as a hybrid motor vehicle or as an electric bicycle or as an electric scooter or as another fully or partially electrically operated means of transport. The induction energy transmission system is preferably designed as an induction cooking system with at least one additional main function other than a cooking function. For example, the induction energy transmission system could be designed as an induction oven system and / or as an induction grill system. In particular, the supply unit could be designed as an induction oven and / or as an induction grill. Advantageously, the induction energy transmission system is designed as an induction hob system. The supply unit is then designed in particular as an induction hob.

[0008] A "supply unit" is understood, in particular, to be a unit that inductively provides energy in at least one operating state and that, in particular, has a primary functionality in the form of energy provision. To provide energy, the supply unit has, in particular, at least one supply induction element, which, in particular, has at least one coil, in particular at least one primary coil, and / or is designed as a coil, and which, in particular, provides energy inductively in the operating state.The 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 a plurality of supply induction elements, which could each inductively provide energy, particularly in the operating state, in particular to a single receiving unit or to at least two or more receiving units. In particular, any one of the supply induction elements could be arranged in close proximity to at least one other of the supply induction elements. At least some of the supply induction elements could, for example, be arranged in a row and / or in the form of a matrix.

[0009] A "receiving unit" is to be understood in particular as a unit which receives energy, in particular inductively, in at least one operating state and which in particular has at least one further main function other than heating. In particular, it is conceivable for the receiving unit to have functions other than heating only. The receiving unit comprises at least one receiving induction element which has at least one secondary coil and / or is designed as a secondary coil and which in particular receives energy inductively in at least one operating state. The receiving unit could, for example, have at least one consumer which could in particular consume energy in the operating state.The receiving unit could, for example, be a handheld power tool, such as a drill and / or an electric screwdriver and / or a hammer drill and / or a saw, and / or a car and / or a mobile device, such as a laptop and / or a tablet and / or a mobile phone and / or a remote control and / or a remote control and / or a self-propelled work device. Furthermore, the receiving unit could be designed as a means of transport, in particular as an electric vehicle or as a hybrid vehicle or as an electric bicycle or as an electric scooter or as another fully or partially electrically powered means of transport. A main function of the receiving unit could, for example, include drilling and / or hammering and / or sawing and / or screwing and / or data processing and / or making phone calls and / or driving.In the case of an induction energy transmission system designed as an induction cooking system, a primary function of the receiving unit is, in particular, the inductive reception and provision of energy for at least one household function other than heating food. For example, the energy absorbed by the receiving unit in the operating state could, in particular, be directly converted into at least one further form of energy, such as mechanical energy to drive another unit, for example, a stirrer, and / or chemical energy to be stored in at least one energy storage device, for example, an accumulator.

[0010] A "switching unit" is understood to mean, in particular, a unit with at least two switching elements, which are particularly intended to establish and / or break an electrically conductive connection between two contacts of the switching element. Preferably, a switching element has at least one control contact, via which it can be controlled, in particular by the control unit. In particular, the switching element is designed as a semiconductor switching element, in particular as a transistor, advantageously as a bipolar transistor with a preferably insulated gate electrode (IGBT). Alternatively, the switching element can be designed as a mechanical and / or electromechanical switching element, in particular as a relay. For example, the switching element can be designed as an FET, a MOSFET, preferably as an RC-IGBT, and particularly preferably as a HEMT transistor.The switching unit can comprise a plurality of switching elements, which can be connected to one another, for example, in series and / or parallel. The switching elements can, in particular in at least one operating state, be electrically connected to at least one supply induction element of the supply unit and, in cooperation with at least one capacitor, form a resonant circuit. The switching elements of the switching unit are preferably arranged in a half-bridge topology. Alternatively, it is conceivable for the switching elements of the switching unit to be arranged in a full-bridge topology and / or in another topology that would be deemed appropriate by a person skilled in the art.

[0011] A "control unit" is understood in particular to mean an electronic unit that is preferably at least partially integrated into a control and / or regulating unit of the supply unit and / or the receiving unit. The control unit preferably comprises a computing unit and, in particular, in addition to the computing unit, a memory unit with at least one control and / or regulating program stored therein, which is intended to be executed by the computing unit. A "switching parameter set" is understood in particular to mean a set of at least one switching parameter and preferably several switching parameters. In particular, a switching parameter set comprises at least one switching parameter associated with a switching element of the switching unit.A "switching parameter" is understood to mean, in particular, a parameter that lies directly within the control unit's sphere of influence during operation of the switching unit and / or can be controlled and / or regulated by it. Alternatively or additionally, the switching parameter can be within the control of a user and thus can be controlled and / or selected indirectly or directly by a user.

[0012] "Intended" should be understood in particular to mean specifically programmed, designed, and / or equipped. The fact that an object is intended for a specific function should be understood in particular to mean that the object fulfills and / or performs this specific function in at least one application and / or operating state.

[0013] It is further proposed that the switching parameter set comprise at least one switch-on time for at least one of the switching elements. This advantageously enables particularly flexible control of the supply power provided by the supply unit. Furthermore, it is proposed that the switching parameter set comprise at least one switch-on duration for at least one of the switching elements. This advantageously further improves flexibility with regard to the control of the supply power provided by the supply unit. Alternatively or additionally, it would be conceivable for the switching parameter set to comprise at least one switching frequency.

[0014] Furthermore, it is proposed that the receiving unit comprise at least one motor for driving at least one further element, which motor can be supplied with energy by the receiving induction element. This makes it possible to provide a receiving unit with a broad spectrum of possible applications. By adjusting the supply power in a particularly flexible manner by adapting at least one switching parameter of a switching parameter set of at least one of the switching elements by the control unit, the motor can advantageously be operated in a flexible speed range, in particular continuously.

[0015] Furthermore, it is proposed that the receiving unit comprise the further element, which is designed as a mechanical food processing element, in particular as a dough hook and / or as a stirrer and / or as a mixer. A "food processing element" is to be understood, in particular, as an element which is intended to process, in at least one operating state, at least one food item, which is arranged, in particular, in a food receiving space of the receiving unit, in particular in a manner other than heating and / or in a manner that goes beyond mere heating, and which, in particular, comprises at least one processing tool which is intended to be in direct contact with the food item in at least one operating state.The food processing element is particularly intended to process, in at least one operating state, at least one foodstuff arranged in the food receiving space, in particular and / or to mix and / or stir and / or grind and / or crush and / or blend and / or emulsify and / or knead and / or cut it. The food processing element is particularly intended to set at least one foodstuff arranged in the food receiving space in motion, in particular starting from at least one stationary state, and / or to keep it in motion, in particular starting from a moving state.The food processing element is particularly intended for processing different types and / or consistencies of food, such as dough and / or liquid and / or at least partially fluid materials and / or sauces and / or at least partially solid foods. In particular, it is conceivable for the receiving unit to have a plurality of, in particular interchangeable, food processing elements, each of which can be supplied with energy by the motor, in particular driven at different speeds. This allows for a high level of convenience and, in particular, a high level of flexibility.

[0016] It is further proposed that a further switching unit, which operates the control unit in the operating state with a further switching parameter set that differs from the first switching parameter set by at least one switching parameter, advantageously achieves a high degree of flexibility. Furthermore, it is proposed that the supply unit have at least one further supply induction element, which is supplied with energy by the further switching unit in the operating state.In particular, it is conceivable for a first supply induction element to inductively supply a first receiving induction element with a first supply power, wherein the control unit operates the switching unit with a first switching parameter set to adjust the first supply power, and simultaneously at least one further supply induction element supplies at least one further receiving induction element with a further supply power different from the first supply power, wherein the control unit operates the further switching unit with the further switching parameter set to adjust the further supply power. This allows for a particularly high level of flexibility.

[0017] Furthermore, it is proposed that the receiving unit have at least one energy storage device for storing electrical energy. An "energy storage device" is understood, in particular, to be a component that can absorb, store, and release energy, in particular chemical and / or preferably electrical energy. In particular, the energy storage device can be designed as an electrochemical capacitor and / or as a fuel cell. Preferably, the energy storage device is designed as a battery storage device, in particular as an accumulator. In particular, the energy storage device is intended to store energy inductively absorbed by at least one receiving induction element of the receiving unit and to make it available at a later time, in particular for carrying out at least one household function other than heating. This advantageously enables a high degree of flexibility.It would be particularly conceivable for the receiving unit to be designed as a portable small household appliance that can be supplied with energy at least partially by the energy storage device, for example as a portable food processor and / or as a portable mixer and / or stirrer, and / or for the receiving unit to have at least one portable element that can be supplied with energy by the energy storage device, for example a portable temperature measuring device. This advantageously allows a high level of flexibility to be achieved. In particular, the energy storage device can advantageously be charged without additional chargers and / or charging cables, which in particular advantageously allows a high level of user satisfaction to be achieved.

[0018] It is further proposed that the supply unit be designed as a hob, in particular as an induction hob. This advantageously makes it possible to provide a multifunctional hob. In particular, a hob can be provided which, in addition to heating food, has further functions, for example inductive charging of at least one energy storage device and / or providing inductive energy for at least one main function of the installation unit other than heating, in particular for mixing and / or stirring and / or kneading and / or chopping food. This advantageously makes it possible to achieve a high level of user satisfaction.

[0019] It is also proposed that the receiving unit be designed as a mounting unit. This advantageously makes it possible to provide a multifunctional mounting unit, in particular a cooking utensil with a multitude of functions. This advantageously makes it possible to achieve high user satisfaction. A "mounting unit" is to be understood in particular as a unit which is intended to be coupled to the supply unit, in particular to the supply induction element, and which, in particular during the coupling to the supply unit, receives and / or absorbs energy from the supply unit in at least one operating state. The mounting unit could, for example, be designed as a cooking utensil and / or comprise at least one cooking utensil.Alternatively or additionally, the installation unit could have at least one base unit, which could in particular be provided for supporting at least one item of cooking utensil, in particular the cooking utensil. The base unit could in particular be provided for arrangement between a mounting plate of the supply unit, in particular the supply unit designed as a hob, and the cooking utensil. Alternatively or additionally, the installation unit could have at least one housing unit, which could in particular be designed as an outer housing unit and in particular could define an outer housing. In particular, at least one object of the installation unit, in particular at least the receiving induction elements and / or the further unit and / or the further receiving induction element and / or the control unit, could be at least partially and advantageously at least to a large extent integrated into the housing unit.

[0020] The invention further relates to a method for operating an induction energy transmission system, in particular an induction cooking system, with a supply unit which has at least one supply induction element which inductively provides energy, with at least one receiving unit which has at least one receiving induction element which receives the inductively provided energy, and with a switching unit which has at least two switching elements which provide an alternating current for the supply induction element, wherein in at least one operating state a supply power is set by changing the duty cycle of exclusively one of the switching elements of the switching unit.

[0021] It is proposed that, in at least one operating state, a supply power be adjusted by adapting at least one switching parameter of a switching parameter set of at least one of the switching elements. This advantageously provides a method for improved control of the switching unit.

[0022] The induction energy transmission system is not intended to be limited to the application and embodiment described above. In particular, the induction energy transmission system may have a number of individual elements, components, and units that differs from the number stated herein to fulfill a functionality described herein.

[0023] Further advantages will become apparent from the following description of the drawings. The drawings illustrate exemplary embodiments of the invention. The drawings, the description, and the claims contain numerous features in combination.

[0024] They show: Fig. 1 shows a supply unit of an induction energy transmission system designed as a hob, Fig. 2 shows a part of the induction energy transmission system with the supply unit and with a receiving unit designed as a cooking utensil, Fig. 3 shows a schematic circuit diagram of a switching unit of the induction energy transmission system, Fig. 4 shows a synopsis of several diagrams with an exemplary representation of a switching parameter set for controlling the switching unit, Fig. 5 shows a diagram illustrating a relationship between a switching parameter of the switching parameter set and a supply power, Fig. 6 shows a diagram illustrating a further relationship between a further switching parameter of the switching parameter set and a supply power, Fig. 7 shows a schematic representation of a method for operating the induction energy transmission system, and Fig. 8 shows a further exemplary embodiment of an induction energy transmission system.

[0025] Figure 1 shows a supply unit 12a of an induction energy transmission system 10a. The supply unit 12a is designed as a hob 18a. The supply unit has a supply induction element 14a. The induction energy transmission system 10a has a switching unit 26a. The switching unit 26a comprises a first switching element 28a and a second switching element 30a. The switching elements 28a, 30a are provided for providing an alternating current 32a for the supply induction element 14a. The induction energy transmission system 10a has a control unit 34a for controlling the switching unit 26a.

[0026] The induction energy transmission system 10a has a further supply induction element 16a. The induction energy transmission system 10a has a further switching unit 52a. The further supply induction element 16a is supplied with energy via the further switching unit 52a. The further switching unit 52a can be controlled via the control unit 52a. The further switching unit 52a is essentially identical in design to the switching unit 26a, which is why the following description regarding the operation of the switching unit 26a can be transferred to the switching unit 52a.

[0027] Figure 2 shows the induction energy transmission system 10a with the supply unit 12a and with a receiving unit 22a. The receiving unit 22a comprises a receiving induction element 24a. The receiving induction element 24a is provided for receiving the energy inductively provided by the supply induction element 14a.

[0028] The receiving unit 16a is designed as a support unit 62a, in particular as a cooking utensil. The support unit 62a has a receiving space 114a. The receiving space 114a is intended for receiving food.

[0029] The receiving unit 22a comprises a motor 46a. The motor 46a can be supplied with energy by the receiving induction element 24a. The receiving unit 22a comprises a further element 48a. The further element 48a is designed as a food processing element 50a, specifically as a stirrer. The motor 46a is provided to drive the further element 48a. In an operating state, the motor 46a drives the further element 48a, designed as a food processing element 50a, to rotate about a rotation axis 116a in order to stir food located in the receiving space 114a.

[0030] Figure 3shows the switching unit 26a of the induction energy transmission system 10a. The switching unit 26a has the first switching element 28a and the second switching element 30a. The first switching element 28a and the second switching element 30a are each designed as transistors, specifically as insulated gate bipolar transistors (IGBTs). The switching elements 28a, 30a of the switching unit 26a can be individually controlled by the control unit 34a. The switching unit 26a has a first capacitor element 78a and a first diode element 80a. The switching unit 26a has a second capacitor element 82a and a second diode element 84a. The switching unit is connected to a voltage source 86a. In an operating state of the induction energy transmission system 10a, the control unit 34a alternately controls the switching elements 28a, 30a within an operating period of a period duration 64a.During half a period 88a, the first switching element 28a is switched to electrically conductive by the control unit 34a and forms a first resonant circuit 90a with the supply induction element 14a and the first capacitor element 78a. During the subsequent half period 88a, the second switching element 30a is switched to electrically conductive by the control unit 34a and forms a second resonant circuit 92a with the supply induction element 14a and the second capacitor element 82a. To set a supply power 36a, the control unit 34a adapts at least one switching parameter 38a of a switching parameter set 40a of at least one of the switching elements 28a, 30a (cf. Figure 4 ).

[0031] Figure 4shows, in a synopsis of three diagrams, an exemplary curve of an alternating current 32a provided in the operating state by the switching elements 28a, 30a of the switching unit 26a for the supply induction element 14a for a supply power 36a of, for example, 1400 W, which is provided by the supply induction element 14a. A time is plotted on an abscissa 66a of a first diagram. A voltage applied to the first switching element 28a is plotted on an ordinate 68a of the first diagram. A time is plotted on an abscissa 70a of a second diagram. A voltage applied to the second switching element 30a is plotted on an ordinate 72a. A time is plotted on an abscissa 74a of a third diagram. A voltage induced by the supply induction element 14a in the receiving induction element 24a is plotted on a left-hand ordinate 76a.To adjust the supply power 36a, the switching unit 34a adjusts the switching parameters 38a of the switching parameter set 40a of the second switching element 30a. The switching parameter set 40a includes a switch-on time 42a and a switch-on duration 44a of the second switching element 30a, which are shown in the second diagram.

[0032] The control unit 34a operates the further switching unit 52a with a further switching parameter set, which differs from the switching parameter set 40a by at least one of the switching parameters 38a. According to the invention, the control unit 34a changes only the duty cycle of a switching element (not shown) of the switching unit 52a to set a supply power different from the supply power 36a.

[0033] Figure 5 shows an example of the relationship between the supply power 36a in watts, which is on an ordinate 102a of the Figure 5is shown, depending on the switch-on time 42a, which is on an abscissa of the Figure 4 Depending on the desired supply power 36a, the control unit 34a can select the switch-on time 42a in a range of half the period 88a minus the duty cycle 44a. Figure 5 The possible range of the switch-on time 42a within half a period 88a is represented as a phase angle from 0° to 180° on an abscissa 100a. The supply power 36a can be reduced by changing the switch-on time 42a, starting from a maximum supply power 108a at low phase angles, to a value of 0 W at a phase angle close to 180°.

[0034] Figure 6 shows an example of the relationship between the supply power 36a in watts, which is on an ordinate 106a of the Figure 6is shown, depending on the duty cycle 44a, which is shown on an abscissa 104a of the Figure 6 Depending on the desired supply power 36a, the control unit 34a can adjust the duty cycle 44a within a range of half the period duration 88a. In Figure 5 the possible range of the duty cycle 44a of half the period 88a is shown as a phase angle from 0° to 180° on the abscissa 104a.

[0035] In Figure 7A method for operating the induction energy transmission system 10a is schematically illustrated. The method comprises a first method step 110a and a second method step 112a. In the first method step 110a, the desired supply power 36a is selected by a user via the control unit 34a. In the second method step 112a, the supply power 36a is set by adapting at least one switching parameter 38a of the switching parameter set 40a of at least one of the switching elements 28a, 30a of the switching unit 26a.

[0036] In Figure 8 A further embodiment of the invention is shown. The following descriptions are essentially limited to the differences between the embodiments, with reference to the description of the embodiment of the Figures 1 to 7To distinguish the embodiments, the letter a in the reference numerals of the embodiment in the Figures 1 to 7 by the letter b in the reference numerals of the embodiment of the Figure 8 With regard to components with the same designation, in particular with regard to components with the same reference numerals, reference can generally also be made to the drawings and / or the description of the embodiment of the Figures 1 to 7 be referred to.

[0037] The Figure 8relates to a further embodiment of an induction energy transmission system 10b with a supply unit 12b, a receiving unit 22b, a switching unit 26b, and a control unit 34b. The supply unit 12b, the switching unit 26b, and the control unit 34b are each structurally essentially identical to the supply unit 12a of the switching unit 26a and that of a control unit 34b of the induction energy transmission system 10a. The induction energy transmission system 10b differs from the induction energy transmission system 10a essentially with regard to the design of the receiving unit 22b. The receiving unit 22b is designed as a portable temperature measuring device 118b. The receiving unit 22b has a receiving induction element 24b. The receiving induction element 24b is provided for receiving energy provided inductively by a supply induction element 14b of the supply unit 12b.The receiving unit 22b has an energy storage device 58b. The energy storage device is designed as a rechargeable battery, specifically a lithium-ion rechargeable battery. The energy storage device 58b is provided for storing the energy received by the receiving induction element 24b. To charge the energy storage device 58b, the receiving unit 22b can be connected to the supply unit 12b, as shown in FIG. Figure 8 The charged energy storage device 58b gradually releases the stored energy to execute at least one function of the recording unit 22b, in the present embodiment for measuring and displaying a temperature. Reference symbol

[0038] 10 Induction energy transmission system 12 Supply unit 14 Supply induction element 16 Additional supply induction element 18 Hob 22 Input unit 24 Input induction element 26 Switching unit 28 First switching element 30 Second switching element 32 Alternating current 34 Control unit 36 ​​Supply power 38 Switching parameters 40 Switching parameter set 42 Switch-on time 44 Duty cycle 46 Motor 48 Additional element 50 Food processing element 52 Additional switching unit 56 Additional supply induction element 58 Energy storage 62 Installation unit 64 Period duration 66 Abscissa 68 Ordinate 70 Abscissa 72 Ordinate 74 Abscissa 76 Left ordinate 78 First capacitor element 80 First diode element 82 Second capacitor element 84Second diode element 86Voltage source 88Half period 90First resonant circuit 92Second resonant circuit 94Right ordinate 100Abscissa 102Ordinate 104Abscissa 106Ordinate 108Maximum supply power 110First process step 112Second process step 114Recording space116Rotary axis 118Temperature measuring device

Claims

1. Induction energy transfer system (10a; 10b), in particular induction cooking system, with a supply unit (12a; 12b) which has at least one supply induction element (14a; 14b) for inductively providing energy, with at least one receiving unit (22a; 22b), which has at least one receiving induction element (24a; 24b) for receiving the inductively provided energy, with a switching unit (26a; 26b), which comprises at least two switching elements (28a, 30a) for providing an alternating current (32a) for the supply induction element (14a; 14b), and with a control unit (34a; 34b) for actuating the switching unit (26a), characterised in that the control unit (34a; 34b), in at least one operating state, alters the switch-on duration (44a) exclusively of one of the switching elements (28a, 30a) of the switching unit (26a) to set a supply power (36a).

2. Induction energy transfer system (10a; 10b) according to claim 1, characterised in that the switching parameter set (40a) comprises at least one switch-on time point (42a) of at least one of the switching elements (28a, 30a).

3. Induction energy transfer system (10a) according to one of the preceding claims, characterised in that the receiving unit (22a) comprises at least one motor (46a) for driving at least one further element (48a), which can be supplied with energy by the receiving induction element (24a).

4. Induction energy transfer system (10a) according to claim 3, characterised in that the receiving unit (22a) has the further element (48a), which is embodied as a mechanical foodstuff processing element (50a).

5. Induction energy transfer system (10a; 10b) according to one of the preceding claims, characterised by a further switching unit (52a), which operates the control unit (34a; 34b) in the operating state with a further switching parameter set, which differs from the switching parameter set (40a) at least by one of the switching parameters (38a).

6. Induction energy transfer system (10a; 10b) according to claim 4, characterised in that the supply unit has at least one further supply induction element (16a; 16b), which is supplied with energy in the operating state by the further switching unit (52a; 52b).

7. Induction energy transfer system (10b) according to one of the preceding claims, characterised in that the receiving unit (22b) has at least one energy store (58b) for storing electrical energy.

8. Induction energy transfer system (10a; 10b) according to one of the preceding claims, characterised in that the supply unit (12a; 12b) is embodied as a hob (18a; 18b).

9. Induction energy transfer system (10a; 10b) according to one of the preceding claims, characterised in that the receiving unit (22a) is embodied as a positioning unit (62a).

10. Hob (18a; 18b) of an induction energy transfer system (10a; 10b) according to claim 8.

11. Method for operating an induction energy transfer system (10a; 10b), in particular an induction cooking system, in particular according to one of claims 1 to 9, with a supply unit (12a; 12b), which has at least one supply induction element (14a; 14b), which inductively provides energy, with at least one receiving unit (22a; 22b), which has at least one receiving induction element (24a; 24b), which receives the inductively provided energy, and with a switching unit (26a; 26b), which comprises at least two switching elements (28a, 30a), which provide an alternating current (32a) for the supply induction element (14a; 14b), characterised in that, in at least one operating state, a supply power (36a) is set by altering the switch-on duration (44a) exclusively of one of the switching elements (28a, 30a) of the switching unit (26a).

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