DE102023205496A1 - Mobile induction charging device - Google Patents

Abstract

The invention relates to a mobile induction charging device (1) for an inductive vehicle charging system (35) for charging a battery of a battery-electric vehicle (5), with an induction coil (2) for receiving an alternating magnetic field, with a support structure (4) for fastening the induction charging device (1) to a vehicle (5), which has a plurality of supports (6) which extend in a support region (7), and with a plurality of plate-shaped magnetic field conductors (8), each of which extends above the induction coil (2), wherein two of these supports (6) are adjacent in the circumferential direction (U) in the support region (7), run at an angle to one another and form a support gap (9) between them in the support region (7), wherein one of the magnetic field conductors (8) is arranged in the region of the support gap (9).
Better positioning compared to a stationary induction charging device can be achieved if the mobile induction charging device (1) has at least one positioning coil (12) for transmitting and/or receiving a magnetic positioning field, if this positioning coil (12) is arranged below a magnetic field conductor (8) and above or below the induction coil (2) and if this positioning coil (12) is arranged completely within the carrier gap (9).

Description

The present invention relates to a mobile induction charging device according to the preamble of claim 1, which is preferably used in an inductive vehicle charging system that serves to charge a battery of a battery-electric vehicle. The invention also relates to a vehicle equipped with such a mobile induction charging device and to an inductive vehicle charging system equipped with such a mobile induction charging device.

Such a vehicle charging system comprises a stationary induction charging device, which can also be referred to as a ground assembly and which is usually arranged in a fixed location, for example in a vehicle parking space, and connected to an electrical power grid, and a mobile induction charging device, which can also be referred to as a vehicle assembly and which is arranged on the respective vehicle. The mobile induction charging device is coupled to the vehicle's battery in a suitable manner, e.g. via a corresponding vehicle-side charging control unit. To charge the battery, the vehicle with its mobile induction charging device is positioned in relation to the stationary induction charging device in such a way that electrical energy can be transferred from the stationary induction charging device to the mobile induction charging device by means of induction, i.e. via a magnetic or electromagnetic alternating field. The inductive vehicle charging system does not require charging plugs that have to be plugged into vehicle-side charging sockets.

A generic mobile induction charging device is known, for example, from DE 10 2019 212 277 A1 known and has an induction coil for receiving a magnetic or electromagnetic alternating field, which extends in a coil plane running perpendicular to the height direction of the induction charging device. Furthermore, the mobile induction charging device is equipped with a support structure for fastening the induction charging device to a vehicle, which has several supports that extend in a support area running parallel to the coil plane. Furthermore, several plate-shaped magnetic field conductors are provided, each of which extends above the induction coil parallel to the coil plane. At least two of these supports are adjacent in the circumferential direction in the support area, run inclined to one another and form a support gap between them in the support area. One of the magnetic field conductors is then arranged in the area of the respective support gap.

During operation of the inductive vehicle charging system, electrical energy is transferred at high electrical power between the stationary induction charging device and the mobile induction charging device through the alternating magnetic or electromagnetic field. This can be problematic if there are foreign bodies in the area of this alternating field. Electrically conductive foreign bodies, in particular metallic foreign bodies, can heat up in the alternating magnetic or electromagnetic field, which creates a risk of burns and in particular a risk of fire. A foreign body sensor system can provide a remedy here, which has several foreign body sensors distributed on the surface of the stationary induction charging device, which can in particular be designed as magnetic field sensors that generate and monitor a magnetic or electromagnetic field. As soon as an electrically conductive foreign body enters this magnetic or electromagnetic field, the field changes, which is then detected by the respective foreign body evaluation device. The foreign body sensor system can detect such foreign bodies in good time, so that the risk of injury and fire is reduced.

For efficient energy transfer during the charging process, it is important in such an inductive vehicle charging system that the vehicle with its mobile induction charging device is positioned as centrally as possible above the stationary induction charging device. To optimally position the mobile induction charging device relative to the stationary induction charging device, it is generally possible to use a foreign body sensor that is already present on the stationary induction charging device for other reasons. In particular, it is conceivable that a position sensor is attached to the vehicle that simulates a virtual foreign body that can be detected by the foreign body sensors of the foreign body sensor system. If an evaluation device knows the position of the foreign body sensors on the stationary induction charging device, the relative position of the virtual foreign body with respect to the stationary induction charging device can be determined. If the relative position of the position sensor with respect to the mobile induction charging device is also known, the relative position of the mobile induction charging device with respect to the stationary induction charging device can also be determined based on the determined position of the virtual foreign body. The problem with using such position sensors and foreign body sensors when aligning stationary and mobile induction charging devices with each other is the fact that there are comparatively many interference contours on the induction charging devices, which make it difficult to generate and detection of the virtual foreign body and thus significantly impair the accuracy of position detection. Examples of interference contours of the mobile induction charging device are the magnetic field conductors and the support structure.

The present invention addresses the problem of providing an improved or at least a different embodiment for a mobile induction charging device and a vehicle and/or vehicle charging system equipped therewith, which is characterized in particular by a relatively precise positioning between stationary and mobile induction charging device.

This problem is solved according to the invention by the subject matter of the independent claim. Advantageous embodiments are the subject matter of the dependent claims.

The invention is based on the general idea of integrating at least one position sensor into the mobile induction charging device. Furthermore, this integration should be carried out in such a way that a positioning coil of the respective position sensor is arranged on the one hand below a magnetic field conductor and on the other hand above or below the induction coil. In addition, the respective positioning coil is arranged within a carrier gap. By positioning the respective positioning coil in the carrier gap, disruptive influences of the support structure on the positioning field can be significantly reduced. Positioning the respective positioning coil below the magnetic field conductor also reduces its influence on the positioning field. This allows the respective positioning coil to radiate downwards more or less freely in order to generate the virtual foreign body, which can then be detected by a foreign body sensor.

In detail, the invention proposes that the induction charging device has at least one positioning coil for transmitting and/or receiving a magnetic or electromagnetic positioning field. Furthermore, the respective positioning coil is arranged in the vertical direction below such a magnetic field conductor and above or below the induction coil. In addition, the respective positioning coil is arranged completely within such a carrier gap. As a result, the respective positioning coil is not covered by the carriers in the vertical direction that delimit the respective carrier gap.

The mobile induction charging device has a height direction that runs essentially vertically when the induction charging device is mounted on the vehicle, i.e. parallel to the direction of gravity. The mobile induction charging device also has a longitudinal direction that runs perpendicular to the height direction and a transverse direction that runs perpendicular to the height direction and perpendicular to the transverse direction. Since the mobile induction charging device is expediently located on the underside of a vehicle, in particular on the underbody of a vehicle, the induction charging device is designed to be flat, so that its height measured in the height direction is significantly smaller than its length measured in the longitudinal direction and also significantly smaller than its width measured in the transverse direction. The relative location specifications "bottom" and "top" in the present context refer to the height direction, which is aligned parallel to the direction of gravity when in proper condition. A plane spanned by the longitudinal direction and the transverse direction, in which the mobile induction charging device extends, then runs horizontally.

The magnetic field conductors preferably consist of a soft magnetic and preferably electrically insulating material. The relative permeability µ _r should be > 2 and preferably > 1 000. Suitable materials include ferrites, so the plate-shaped magnetic field conductors are often also referred to as ferrite plates.

An embodiment is preferred in which the respective positioning coil is arranged in the vertical direction between such a magnetic field conductor and the induction coil. This means that the respective positioning coil is better protected from the alternating field of the induction coil. Additionally or alternatively, it can be provided that the respective positioning coil is arranged in the vertical direction completely within the support structure, which results in compact, space-saving accommodation.

According to an advantageous embodiment, the support structure can have an inner frame that connects two or more or all supports radially on the inside with respect to a central axis of the induction charging device that runs parallel to the height direction. The respective space between the supports is then radially delimited on the inside by the inner frame. The positioning coil arranged in the respective space between the supports is thus not covered by the inner frame in the height direction. The respective inner frame can be designed in the shape of a plate or ring. A plate-shaped frame is closed in a frame plane in which it extends. The plate-shaped or closed frame therefore has no opening that penetrates the frame perpendicular to the frame plane. In contrast, an annular frame is open in the frame plane and thus has at least one opening that penetrates the frame perpendicular to the frame plane. The annular frame runs around the opening in the circumferential direction, preferably closed. the annular frame does not have to have a circular outer contour, but can have a rectangular or square or polygonal or trapezoidal outer contour.

Additionally or alternatively, according to another embodiment, the support structure can have an outer frame that connects two or more or all supports to one another radially on the outside with respect to a central axis of the induction charging device that runs parallel to the height direction. The respective space between the supports is then radially delimited on the outside by the outer frame. The positioning coil arranged in the respective space between the supports is therefore not covered by the outer frame in the height direction. The respective outer frame can be designed in a ring shape and in particular can run in a closed manner in the circumferential direction.

In principle, the positioning coil can have any geometry suitable for generating the position field. For example, the respective positioning coil can be circular, elliptical or oval. In an advantageous embodiment, it can be provided that the respective positioning coil has a contour laterally or perpendicularly to the height direction, which is geometrically adapted to a circumferential contour of the respective carrier gap delimited by the support structure laterally or perpendicularly to the height direction. Accordingly, the positioning coil follows the circumferential contour within the carrier gap, whereby the positioning coil has a comparatively large surface area, which is advantageous for generating an easily recognizable position field.

According to another embodiment, the respective positioning coil can have two coil sections that extend parallel to one of the two supports that delimit the respective space between the supports in which the respective positioning coil is arranged. This optimally utilizes the abdominal space provided in the space between the supports for the positioning coil. The positioning coil can expediently be designed in a triangular or trapezoidal shape.

In a further embodiment, the respective positioning coil can be formed on a positioning coil carrier that is arranged in the respective carrier gap. The use of a positioning coil carrier simplifies the arrangement of the positioning coil in the respective carrier gap. For example, the positioning coil carrier can be equipped with the respective positioning coil before installation in the support structure. The positioning coil carrier can be a circuit board onto which the respective positioning coil is applied, in particular printed.

In an advantageous embodiment, the respective positioning coil carrier can have a central through-opening. The positioning coil carrier is therefore not plate-shaped, but ring-shaped and can have a polygonal, in particular trapezoidal, outer contour. This design means that only a small amount of material is required for the positioning coil carrier, which reduces the manufacturing costs and also the weight of the mobile induction charging device.

According to a particularly advantageous development, it can now also be provided that the induction coil or an induction coil carrier carrying the induction coil is glued or cast with the respective magnetic field conductor through the through-opening. The through-opening of the positioning coil carrier thus has an additional function. By gluing or casting the induction coil or the induction coil carrier with the respective magnetic field conductor, the thermal coupling can be improved in particular in order to transfer heat from the induction coil to the respective magnetic field conductor. In particular, adhesives or casting materials with an increased thermal conductivity coefficient can be used here. An increased thermal conductivity coefficient λ exists when λ > 1 W/(m·K), preferably λ > 10 W/(m·K).

In another embodiment, control lines can be provided for controlling the respective positioning coil, which are routed through the support structure to an area above the magnetic field conductors. The control lines thus run within the support structure, i.e. in particular between the inner frame and outer frame and between adjacent supports, and thus save space.

A particularly advantageous embodiment is one in which the respective control circuit has several electronic components, with at least one component being arranged on a positioning coil carrier that carries the positioning coil, while at least one other component is arranged on a circuit carrier that is arranged in an area above the magnetic field conductor. Control lines can now lead from the positioning coil carrier through the support structure to the circuit carrier. By dividing the control circuit into at least two different carriers, the available installation space can be better utilized on the one hand. On the other hand, this reduces disruptive interactions, in particular thermal and/or electromagnetic interactions.

An embodiment is preferred in which the induction charging device has at least one Position sensor which has at least one positioning coil and also a control circuit for controlling the respective positioning coil. The respective positioning coil can expediently be designed as a transmitting coil for generating a magnetic positioning field.

For example, the respective control circuit can have at least one capacitor arrangement, an attenuation element, a filter and a switching element as electronic components. The capacitor arrangement serves to form an oscillating circuit with the positioning coil. The capacitor circuit has at least one capacitor. A design in which the capacitor arrangement has two capacitors connected in parallel is preferred. At least the capacitor arrangement is then arranged on the positioning coil carrier, while at least the switching element is arranged on the circuit carrier. To create variants, it can be expedient to arrange as many components as possible on the circuit carrier, which can then be designed identically with its equipment for all variants. In contrast, an adaptation of the oscillating circuit to the boundary conditions of the respective variant, which is necessary for the creation of variants, can be carried out more cheaply if the capacitor arrangement is arranged on the positioning coil carrier. Optionally, the attenuation element and/or the filter can be arranged on the positioning coil carrier.

In these embodiments with control lines guided through the support structure, it is fundamentally conceivable that the control lines are guided past components of the support structure on the outside, within a circumference of the support structure. Alternatively, it is also conceivable that channels are formed in components of the support structure through which the control lines are guided. Such channels can be open at the side like a groove or closed at the side like a hole.

In another embodiment, it can be provided that the induction charging device has a longitudinal direction transverse to the height direction and a longitudinal center line running parallel to the longitudinal direction, wherein the supports are arranged such that the respective space between the supports in which the respective positioning coil is arranged is aligned substantially centrally to the longitudinal center line. In other words, the longitudinal center line extends centrally through the respective space between the supports. In particular, the longitudinal center line extends substantially centrally through the respective positioning coil. This simplifies finding the optimal positioning between the stationary induction charging device and the mobile induction charging device when using the vehicle charging system.

In another embodiment, it can be provided that the induction charging device has at least two such positioning coils, which are arranged diametrically opposite one another with respect to a central axis of the induction charging device running parallel to the height direction. If a position sensor of the type described above is used, it can have these two positioning coils arranged diametrically opposite one another. It is also conceivable to use two such position sensors, each with a positioning coil, which are then positioned diametrically opposite one another. The geometric center of the two positioning coils then corresponds to the position of the central axis, which makes it easier to find the optimal positioning between the induction charging devices when using the inductive vehicle charging system.

A battery-electric vehicle according to the invention has at least one battery, a charging control device coupled to the battery for charging the battery, and a mobile induction charging device of the type described above, which is coupled to the charging control device. The support structure of the mobile induction charging device is expediently attached to the vehicle floor, in particular to the underbody.

An inductive vehicle charging system according to the invention, which serves to charge a battery of a battery-electric vehicle, is equipped with a mobile induction charging device of the type described above, which is intended for attachment to a vehicle. Furthermore, the inductive vehicle charging system is equipped with a stationary induction charging device, which is intended for attachment to a vehicle parking space. The stationary induction charging device has at least one induction coil for generating a magnetic or electromagnetic alternating field and a position detection device for detecting the respective position field. The position detection device can in particular be a foreign body sensor.

Further important features and advantages of the invention emerge from the subclaims, from the drawings and from the associated description of the figures based on the drawings.

It is understood that the features mentioned above and those to be explained below can be used not only in the combination specified, but also in other combinations or on their own, without to depart from the scope of the invention. Components of a higher-level unit mentioned above and to be mentioned below, such as a device, an apparatus or an arrangement, which are designated separately, can form separate parts or components of this unit or can be integral areas or sections of this unit, even if this is shown differently in the drawings.

Preferred embodiments of the invention are illustrated in the drawings and are explained in more detail in the following description, wherein like reference numerals refer to like or similar or functionally identical components.

They show, each schematically,

• 1 a highly simplified view from below of a mobile induction charging device with two positioning coils in the area of an induction coil,
• 2 a view like in 1 , but with omitted induction coil and with two positioning coils in another embodiment,
• 3 a sectional view of the induction charging device in the area of a positioning coil from 1 ,
• 4 a sectional view of the induction charging device in the area of a positioning coil from 2 ,
• 5 a highly simplified circuit diagram of a control circuit of the positioning coil,
• 6 an enlarged detail VI from 2 in the area of one of the positioning coils.

According to the 1 and 2 A mobile induction charging device 1 has at least one induction coil 2, which for simplification in 2 is omitted. The induction coil 2 of the mobile induction charging device 1 serves to receive a magnetic or electromagnetic alternating field and extends in a coil plane 3, which is in the 3 and 4 is indicated with a dotted line. The coil plane 3 extends into the 1 and 2 parallel to the drawing plane and is perpendicular to a height direction Z, which is in the 1 , 2 and 6 perpendicular to the plane of the drawing. The induction charging device 1 also defines a longitudinal direction X and a transverse direction Y, which extends perpendicular to the longitudinal direction X. The height direction Z runs perpendicular to the longitudinal direction X and perpendicular to the transverse direction Y. A circumferential direction U runs around the height direction Z and is in the 1 , 2 and 6 each indicated by a double arrow.

Furthermore, the mobile induction charging device 1 has a support structure 4 which serves to attach the induction charging device 1 to a vehicle 5 which is in the 3 and 4 is indicated by a broken line. The support structure 4 has several supports 6, which extend in a support area 7, which is in the 3 and 4 is indicated by a curly bracket and which runs parallel to coil plane 3.

In addition, the mobile induction charging device 1 is equipped with several plate-shaped magnetic field conductors 8. These magnetic field conductors 8 can be configured flat and extend parallel to the coil plane 3. In addition, the magnetic field conductors 8 are arranged above the induction coil 2.

According to the 1 and 2 and in accordance with 6 Two of these supports 6 are now adjacent to one another in the support area 7 in the circumferential direction U, are inclined to one another and form a support gap 9 between them. The magnetic field conductors 8 are now each arranged in the area of such a support gap 9 on the support structure 4. These magnetic field conductors 8 can each be inserted into such a support gap 9. It is also conceivable that the magnetic field conductors 8 are supported on the supports 6 in the height direction Z.

The induction charging device 1 shown here is also equipped with at least one position sensor 10. In the 1 and 2 In the preferred embodiments shown, the induction charging device 1 has two such position sensors 10, which are arranged diametrically opposite one another with respect to a central axis 11 of the induction charging device 1. The central axis 11 runs parallel to the vertical axis Z and can be arranged in particular in the center of the support structure 4 and/or in the center of the induction coil 2. In the 1 and 2 the central axis 11 is perpendicular to the drawing plane.

The respective position sensor 10 has at least one positioning coil 12 for generating a magnetic or electromagnetic position field and a control circuit 13 for controlling the respective positioning coil 12. The respective positioning coil 12 is in the 1 and 2 and 6 are each symbolized by a closed ring. The control circuit 13 is in the 3 and 4 indicated. 5 shows a circuit diagram for such a control circuit 13. The respective positioning coil 12 is preferably arranged in the height direction Z between such a magnetic field conductor 8 and the induction coil 2. Alternatively, the respective positioning coil 12 can also be arranged below the induction coil 2. Furthermore, the respective positioning coil 12 is arranged completely within such a carrier gap 9. In this respect, the respective positioning coil 12 is spaced laterally or laterally to the height direction Z from the support structure 4 within the respective carrier gap 9. In the 3 and 4 In the arrangement shown of the respective positioning coil 12 in the height direction Z between the respective magnetic field conductor 8 and the induction coil 2, it can be provided in particular that the positioning of the respective positioning coil 12 is selected such that at no point is there an overlap in the height direction Z of the positioning coil 12 by a component of the support structure 2, in particular by a carrier 6.

According to the 1 and 2 and 6, the support structure 4 can have an inner frame 14, which in the examples shown is ring-shaped and connects all the supports 6 to one another in the circumferential direction U. Furthermore, the inner frame 14 delimits the gaps between the supports 9 radially inwards. In addition, the support structure 4 can have an outer frame 15, which in the examples shown is ring-shaped and connects all the supports 6 to one another in the circumferential direction U. The outer frame 15 now delimits the gaps between the supports 9 radially outwards. The respective positioning coil 12 can also be seen to be spaced laterally from the inner frame 14 and the outer frame 15. It can preferably be provided that the respective positioning coil 12 is not covered by the inner frame 14 or the outer frame 15 in the height direction Z. In particular, the support structure 4 can be configured such that the support gaps 9 are open in the height direction Z, i.e. are not covered by a component of the support structure 4 in the height direction Z.

Furthermore, the respective positioning coil 12 has a contour 16 transversely or laterally to the height direction Z, which forms the ring of the positioning coil 12. The contour 16 can and expediently be adapted to a circumferential contour 17 of the associated carrier gap 9, wherein this circumferential contour 17 is defined or limited by the support structure 4 transversely or laterally to the height direction Z. In the examples of 1 and 2 and 6, the circumferential contour 17 of the respective carrier gaps 9 is essentially trapezoidal in shape. In keeping with this, the course contour 16 of the respective positioning coil 12 is also trapezoidal in shape in the examples. Furthermore, the 1 and 2 and 6 that the respective positioning coil 12 has two coil sections 18, each of which extends parallel to one of the two carriers 6, which delimit the respective carrier gap 9 in which the respective positioning coil 12 is arranged. In the 2 and 6 It is also recorded that a further, inner coil section 19 runs parallel to the inner frame 14, while a further, outer coil section 20 runs parallel to the outer frame 15.

As is particularly the case with 1 to 4 and 6 , the respective positioning coil 12 can be formed on a positioning coil carrier 21, which is arranged in the respective carrier gap 9. The positioning coil 12 can be printed on the positioning coil carrier 21. The positioning coil carrier 21 is flat and can extend perpendicular to the height direction Z. Furthermore, the positioning coil carrier 21 can be formed from circuit board material. In the 1 and 3 In the embodiment shown, the positioning coil carrier 21 is designed as a plate or full surface. In contrast, the 2 and 4 and 6 an embodiment in which the positioning coil carrier 21 is designed in a ring shape so that it has a central through-opening 22 around which the positioning coil 12 rotates.

According to 4 It can now be provided that the induction coil 2 or a 3 and 4 shown induction coil carrier 23, in which the induction coil 2 is embedded, is glued or cast through the respective through-opening 22 to the respective magnetic field conductor 8. A corresponding adhesive connection or a corresponding casting is shown in 4 indicated and designated 24. The induction coil 2 is wound with a coil wire, which can in particular be designed as a stranded wire.

In the 1 to 4 and 6 also indicate control lines 25 which serve to control the respective positioning coil 12. These control lines 25 can now be connected according to the 3 and 4 from the respective positioning coil 12 through the support structure 4 to an area 26 which is located above the magnetic field conductor 8 and which is in the 3 and 4 is indicated by a curly bracket. In 1 it can be seen how the control lines 25 run at least in sections within a component of the support structure 4, namely in the outer frame 15. In the 2 and 6 On the other hand, it is shown how the control lines 25 run at least partially within supports 6. In the 3 and 4 it can be seen how the control lines 25 are led through a carrier 6.

According to 5 the control circuit 13 may comprise a plurality of components 27, which may be, purely by way of example and without limitation of generality, a capacitor arrangement 28, an attenuation element 29, a filter 30 and a switching element 31. The capacitor arrangement 28 can manage with a single capacitor C. In the example, however, a preferred variant with two capacitors C connected in parallel is shown. The capacitor arrangement 28 forms an electrical resonant circuit with the positioning coil 12. The attenuation element 29 can be formed, for example, by an ohmic resistor R. The filter 30 can be formed by an inductance L, a capacitor C and an ohmic resistor R. The switching element 31 can be formed by a transistor T. At least one of these components 27 can now be expediently arranged on the positioning coil carrier 21. For example, at least the capacitor arrangement 28 is arranged on the positioning coil carrier 21. At least one other of these components 27, on the other hand, is arranged on a circuit carrier 32 which is arranged according to the 3 and 4 above the magnetic field conductor 8, namely in the said area 26 above the magnetic field conductor 8. For example, at least the switching element 31 is arranged on this circuit carrier 32. For an inexpensive variant, it may be expedient to also attach the attenuation element 29 to the positioning coil carrier 21. For improved EMC, it may be expedient to attach the filter 30 to the positioning coil carrier 21, where EMC stands for electromagnetic compatibility.

In the 3 and 4 a cooling plate 33 is also shown, with the aid of which heat is to be dissipated from the induction charging device 1. It is clear that for this purpose, for example, the magnetic field conductors 8 transfer heat and are connected to this cooling plate 33, e.g. by gluing or by casting from a substance or material with increased thermal conductivity as described above for the gluing 24 or the casting 24.

In the example of 1 and 2 and 6, the induction charging device 1 has a longitudinal center line 34 running parallel to the longitudinal direction X. The supports 6 are expediently positioned or arranged within the support structure 4 such that the support gap 9 provided for accommodating the respective positioning coil 12 is essentially centrally aligned with respect to this longitudinal center line 34. As a result, the respective positioning coil 12 in this support gap 9 can also be aligned essentially centrally with respect to the longitudinal center line 34. When using two positioning coils 12 which are diametrically opposite one another with respect to the center axis 11, the arrangement of the two positioning coils 12 can also be such that the center axis 11 is located in the geometric center of the two positioning coils 12.

The mobile induction charging device 1 presented here is in accordance with the 1 and 2 expediently a component of an inductive vehicle charging system 35 (not shown otherwise), which has as a further important component a stationary induction charging device which is configured complementarily to the mobile induction charging device 1 in order to effect the inductive energy transfer.

QUOTES INCLUDED IN THE DESCRIPTION

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Cited patent literature

• DE 10 2019 212 277 A1 [0003]

Claims (18)

Mobile induction charging device (1) for an inductive vehicle charging system (35) for charging a battery of a battery-electric vehicle (5), - with at least one induction coil (2) for receiving an alternating magnetic field, which extends in a coil plane (3) running perpendicular to the height direction (Z) of the induction charging device (1), - with a support structure (4) for fastening the induction charging device (1) to a vehicle (5), which has a plurality of supports (6) which extend in a support region (7) running parallel to the coil plane (3), - with a plurality of plate-shaped magnetic field conductors (8), each of which extends above the induction coil (2) parallel to the coil plane (3), - wherein at least two of these supports (6) are adjacent in the support region (7) in the circumferential direction (U), run inclined to one another and form a support gap (9) between them in the support region (7), - wherein one of the magnetic field conductors (8) is arranged in the region of the respective support gap (9) is characterized in that - the induction charging device (1) has at least one positioning coil (12) for transmitting and/or receiving a magnetic positioning field, - that the respective positioning coil (12) is arranged below such a magnetic field conductor (8) and above or below the induction coil (2), - that the respective positioning coil (12) is arranged completely within such a carrier gap (9). Induction charging device (1) according to claim 1 , characterized in that - the respective positioning coil (12) is arranged in the height direction (Z) between such a magnetic field conductor (8) and the induction coil (2). Induction charging device (1) according to claim 1 or 2 , characterized in that - the respective positioning coil (12) is arranged completely within the support structure (4) in the height direction (Z). Induction charging device (1) according to one of the preceding claims, characterized in that - the support structure (4) has an inner frame (14) which connects two or more or all supports (6) to one another radially on the inside with respect to a central axis (11) of the induction charging device (1) running parallel to the height direction (Z), - that the respective space between the supports (9) is radially delimited radially on the inside by the inner frame (14). Induction charging device (1) according to one of the preceding claims, characterized in that - the support structure (4) has an outer frame (15) which connects two or more or all supports (6) to one another radially on the outside with respect to a central axis (11) of the induction charging device (1) running parallel to the height direction (Z), - the respective space between the supports (9) is radially delimited radially on the outside by the outer frame (15). Induction charging device (1) according to one of the preceding claims, characterized in that - the respective positioning coil (12) has a contour (16) laterally or perpendicularly to the height direction (Z), which contour is geometrically adapted to a circumferential contour (17) of the respective carrier gap (9) delimited by the support structure (4) laterally or perpendicularly to the height direction (Z). Induction charging device (1) according to one of the preceding claims, characterized in that - the respective positioning coil (12) has two coil sections (18) which extend parallel to one of the two carriers (6) which delimit the respective carrier intermediate space (9) in which the respective positioning coil (12) is arranged. Induction charging device (1) according to one of the preceding claims, characterized in that - the respective positioning coil (12) is formed on a positioning coil carrier (21) which is arranged in the respective carrier intermediate space (9). Induction charging device (1) according to claim 8 , characterized in that - the respective positioning coil carrier (21) has a central through opening (22). Induction charging device (1) according to claim 9 , characterized in that - the induction coil (2) or an induction coil carrier (23) carrying the induction coil (2) is glued or cast with the respective magnetic field conductor (8) through the through opening (22). Induction charging device (1) according to one of the preceding claims, characterized in that - control lines (25) for controlling the respective positioning coil (12) are guided through the support structure (4) to an area (26) located above the magnetic field conductors (8). Induction charging device (1) according to one of the preceding claims, characterized in that - the induction charging device (1) has at least one position sensor (10) which has the at least one positioning coil (12) and a control circuit (13) for controlling the respective positioning coil (12), - that the respective positioning coil (12) is designed as a transmitting coil for generating a magnetic positioning field. Induction charging device (1) according to claim 12 , characterized in that - the respective control circuit (13) has a plurality of electronic components (27), - that at least one component (27) is arranged on a positioning coil carrier (21) which carries the respective positioning coil (12), - that at least one other component (27) is arranged on a circuit carrier (32) which is arranged in an area (26) lying above the magnetic field conductors (8), - that control lines (25) lead from the positioning coil carrier (21) through the support structure (4) to the circuit carrier (32). Induction charging device according to claim 13 , characterized in that - the respective control circuit (13) has at least one capacitor arrangement (28), an attenuation element (29), a filter (30) and a switching element (31) as electronic components (27), - that at least the capacitor arrangement (28) is arranged on the positioning coil carrier (21), - that at least the switching element (31) is arranged on the circuit carrier (32). Induction charging device (1) according to one of the preceding claims, characterized in that - the induction charging device (1) has a longitudinal direction (X) transverse to the height direction (Z) and a longitudinal center line (34) running parallel to the longitudinal direction (X), - that the supports (6) are arranged such that the respective support intermediate space (9) in which the respective positioning coil (12) is arranged is aligned substantially centrally to the longitudinal center line (34). Induction charging device (1) according to one of the preceding claims, characterized in that - the induction charging device (1) has at least two such positioning coils (12) which are arranged diametrically opposite one another with respect to a central axis (11) running parallel to the height direction (Z). Battery-electric vehicle (5), - with a battery, - with a charging control device which is coupled to the battery, - with a mobile induction charging device (1) according to one of the preceding claims which is coupled to the charging control device. Inductive vehicle charging system (35) for charging a battery of a battery-electric vehicle (5), - with a mobile induction charging device (1) according to one of the Claims 1 until 16 for attachment to a vehicle (5), - with a stationary induction charging device for attachment to a vehicle parking space, which has at least one induction coil for generating an alternating magnetic field and a position detection device for detecting the respective position field.

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