EP2828869B1 - Energy transmission system with a module that can be inductively coupled to a primary conductor system - Google Patents

Description

The invention relates to an energy transmission system with a module which can be inductively coupled to a primary conductor system.

From the EP 1 698 037 B1 an inductive supply of a module is known.

In the case of ferrite core sections touching one another, the magnetic conductivity depends on the contact pressure of the two ferrite core sections. This is because the contact surfaces have roughness in the micro range, so that the microscopic contact surface is enlarged as the contact pressure increases.

From the US 2010/066167 A1 an inductively supplyable compact drive is known which has an electric motor driven gear.

From the US 2007/0145936 A1 an inductive supply of electrical devices is known.

The invention is therefore based on the object of developing an inductively supplied module, with the aim being to enable cost-effective, error-free manufacture.

According to the invention, the object is achieved in the energy transmission system with a module which can be inductively coupled to a primary conductor system according to the features specified in claim 1.

Important features of the invention in the device and a method are that the energy transmission system is designed with a module that can be inductively coupled to a primary conductor system,
in particular where the primary conductor system comprises an outgoing conductor and a return conductor,
the module having a lower part and an upper part, the upper part being attachable to the lower part and being connectable to the latter,
the lower part has a printed circuit board equipped with electronic components,
wherein a ferrite core section is arranged on the circuit board,
in particular with the ferrite core section being adhesively bonded to the printed circuit board,
wherein a secondary winding is connected to the printed circuit board and the ferrite core section forms a coil core of the secondary winding with a further ferrite core section,
the further ferrite core section and a receiving area for the primary conductor system, in particular for a section of the primary conductor system, being arranged in the upper part.
The advantage here is that there is a magnetic conductivity independent of the contact pressure,
the primary conductor system, in particular forward conductor and return conductor, can be clipped into the receiving area arranged on the upper part.

The advantage here is that cost-effective production is made possible since a ferrite core section on the printed circuit board can already be fitted in the lower part and the missing part of the coil core can be provided in the upper part. In addition, use in wet areas or systems in explosion-proof environments is possible, since no electrical contacting is required when connecting to the power supply. Furthermore, the module can be displaced in the direction of the line and thus the position of the module can be changed in a simple manner without the need to disconnect and subsequently connect the electrical power supply. It is thus possible to readjust the position of the module.

According to the invention, the primary conductor system, in particular the forward conductor and return conductor, can be clipped into the receiving area arranged on the upper part, in particular the forward conductor in a receiving area provided for the outgoing conductor and the return conductor in the receiving area provided for the return conductor on the upper part. The advantage here is that a simple connection of the line conductors is made possible. In addition, the position of the line conductors can be specified with great precision when the upper part is placed on the lower part, and therefore the line conductors can be inserted between the legs in the respective receiving area.

In an advantageous embodiment, the ferrite core section has legs and a yoke, the legs being connected to the yoke,
wherein the secondary winding is arranged wound around at least one leg. The advantage here is that an effective coupling can be achieved and thus a high degree of efficiency in the transmission
In an advantageous embodiment, the lower part and the upper part can be connected in a force-locking and form-fitting manner, in particular by means of clips, in particular in that a protruding nose section can be clipped into a recess when the upper part is placed on the lower part. The advantage here is that a quick and easy connection is made possible, in particular when using plastic housing parts, in particular with the housing part for the lower part and with the housing part for the upper part.

In an advantageous embodiment, the ferrite core section is comb-shaped, in particular with a plurality of legs spaced apart from one another being arranged on the yoke. The advantage here is that the ferrite core section resembles an E with three, four or more legs which are arranged on the yoke forming a back.

In an advantageous embodiment, the legs arranged on the yoke of the ferrite core section are regularly spaced from one another,
wherein the further ferrite core section is constructed identically to the ferrite core section. The advantage here is that only a single type of ferrite core sections is to be provided in the bearing. Storage space can thus be saved and the production as a whole can be simplified and designed inexpensively.

In an advantageous embodiment, when the upper part is placed on the lower part, the ferrite core section and the further ferrite core section form an essentially annular coil core,
an air gap, preferably filled with plastic, being arranged between the ferrite core section and the further ferrite core section,
in particular with the plastic being extrusion-coated around the further ferrite core section. The advantage here is that a non-positive connection of the upper part to the lower part can be achieved by inserting the further ferrite core section into the corresponding receptacle on the ferrite core section.

In an advantageous embodiment, a section of the primary conductor system, in particular a section of the outgoing conductor and a section of the return conductor, is connected, in particular clipped, into a respective corresponding receiving area on the upper part. The advantage here is that a simple connection is made possible.

In an advantageous embodiment, an antenna designed as a flat winding is arranged between the outgoing conductor and the return conductor, the winding axis being oriented perpendicularly on the plane spanned by the forward conductor and return conductor, in particular in the area next to the antenna.
a higher-frequency data transmission signal can be modulated and / or demodulated by means of the antenna compared to the frequency of the power signal fed into the primary conductor system. The advantage here is that data can be transferred without any further necessary components. In particular, the existing cabling can be used.

In an advantageous embodiment, the flat winding of the antenna is carried out on a piece of printed circuit board,
in particular wherein the circuit board piece is arranged parallel to the circuit board and the connections of the antenna are electrically connected to conductor track sections of the circuit board. The advantage here is that a simple manufacture of the antenna by PCB manufacturing process is executable. In addition, a simple assembly of the circuit board section on the circuit board can be achieved.

In an advantageous embodiment, the further ferrite core section is cast or encapsulated in the upper part, the molded or cast plastic provided in the gap, in particular an air gap, is arranged between the ferrite core section and the further ferrite core section. The advantage here is that corrosion protection can be carried out in a simple manner and at the same time it can be used for non-positive connection.

Further advantages result from the subclaims.

• In der Figur 1 ist ein schematischer Aufbau eines erfindungsgemäßen Moduls gezeigt, wobei ein erstes Metallprofil 2 zur Befestigung verwendet ist. Dabei sind die Gehäuseteile teilweise ausgeblendet.
• In der Figur 2 ist ein anderes Metallprofil 4 verwendet.
• In der Figur 3 ist ein Querschnitt durch eine Ferritkernanordnung des Moduls gezeigt.
• In der Figur 4 ist für ein zweites erfindungsgemäßes Ausführungsbeispiel eine Schrägansicht eines Moduls gezeigt, wobei anstatt des in den Figuren 1 bis 3 ausschließlich verwendeten Ferritkernabschnitts 14 auch im Oberteil ein Ferritkernabschnitt 34 verwendet, so dass eine verbesserte Flussführung erreichbar ist.
• In der Figur 5 ist ein Querschnitt durch das zweite erfindungsgemäße Ausführungsbeispiel gezeigt.
• In der Figur 6 ist eine Schrägansicht auf die bestückte Leiterplatte 35 gezeigt.
• In der Figur 7 ist ein anders angeordneter Querschnitt gezeigt, der auf ein ähnliches Ausführungsbeispiel wie Figur 3 bezogen ist und durch den Antennenbereich führt, wobei der Antennenbereich zur Einkopplung und Auskopplung eines Kommunikationssignals dient.
• In der Figur 8 ist ein Grundträger gezeigt, der aus einem Kunststoffträger und Ferritteilen 14 besteht, wobei in dem Grundträger kanalartig ausgebildete Aufnahmebereiche zur Aufnahme und Führung eines Hinleiters beziehungsweise eines Rückleiters angeordnet sind.
• In der Figur 9 und 10 sind jeweils Schrägansichten gezeigt, wobei die Befestigung des Elektronik aufweisenden Unterteils erkennbar ist, wobei in Figur 9 die Befestigung vergrößert dargestellt ist.

The invention will now be explained in more detail with reference to figures:

• In the Figure 1 a schematic structure of a module according to the invention is shown, a first metal profile 2 being used for fastening. The housing parts are partially hidden.
• In the Figure 2 another metal profile 4 is used.
• In the Figure 3 a cross section through a ferrite core arrangement of the module is shown.
• In the Figure 4 an oblique view of a module is shown for a second exemplary embodiment according to the invention, wherein instead of that in FIGS Figures 1 to 3 exclusively used ferrite core section 14 also uses a ferrite core section 34 in the upper part, so that improved flow guidance can be achieved.
• In the Figure 5 a cross section through the second embodiment of the invention is shown.
• In the Figure 6 an oblique view of the printed circuit board 35 is shown.
• In the Figure 7 a differently arranged cross section is shown, which is based on a similar embodiment as Figure 3 is related and leads through the antenna area, the antenna area being used for coupling and decoupling a communication signal.
• In the Figure 8 A base carrier is shown, which consists of a plastic carrier and ferrite parts 14, wherein in the base carrier channel-shaped receiving areas for receiving and guiding a forward conductor or a return conductor are arranged.
• In the Figure 9 and 10th oblique views are shown in each case, the attachment of the electronics-containing lower part being recognizable, wherein in Figure 9 the attachment is shown enlarged.

In both exemplary embodiments, the module has an upper part and a lower part containing a printed circuit board 35. The associated housing parts are preferably made of plastic.

As in Figure 1 and 2nd shown, the circuit board 35 is equipped with heat-conducting components 3. The module thus has an electronic circuit, the components 3 of which are arranged on the printed circuit board 35. The electronic circuit can be supplied inductively by inductively coupling a secondary winding 12 of the electronic circuit to a primary conductor system.

The primary conductor system is designed as a closed, elongated current loop, so that primary conductor sections are inserted into the lower part of the module. In this case, a first primary conductor section shown in the figures is an outgoing conductor 10 and another is a return conductor 11. Since outgoing conductor 10 and return conductor 11 are each sections of the conductor loop, the amounts of current flowing in them are the same. The upper part has no electronic circuit. The upper part therefore has the function that when the upper part is placed on the lower part, the magnetic flux with a high magnetic conductivity is guided in the multi-part ferrite core. At least one ferrite part is in the upper part and at least one further ferrite part is in the lower part.

The secondary winding 12 is electrically connected to conductor track sections of the printed circuit board 35. The ends of the winding wire of the secondary winding 12 are preferably guided to contact pins of a connector part, the contact pins of which are inserted into the printed circuit board 35 and soldered together.

The lower part has channel-like cable receiving areas. These are designed such that outgoing conductor 10 and return conductor 11 can be inserted and clipped into the cable receiving areas.

In addition, ferrite core sections 14 are accommodated in the upper part, preferably cast or encapsulated or held in a force-fitting and / or form-fitting manner, in particular clipped on.

The secondary winding 12 is provided wound around a leg of a comb-shaped ferrite core section 13, the ferrite core section 13 being arranged in the lower part. Ferrite parts 14 provided as yokes are arranged in the upper part and, when the upper part is placed on the lower part, bring about a magnetically highly conductive connection between the end sections of the legs of the ferrite core of the lower part.

In the embodiment according to Figure 4 and 5 the entire ferrite core consists of the two identical ferrite core sections (33, 34). Thus, the same, that is to say the same, ferrite core section 33 as the ferrite core section 34 which can be used in the upper part can be provided in the lower part, as a result of which the number of different parts required can be reduced and thus storage space and costs can be reduced during manufacture.

As in the Figures 1 to 3 shown, the comb-shaped ferrite core section 13 has a yoke facing the printed circuit board 35, on which four legs are arranged, in particular project vertically. It thus resembles an E, the middle leg of the E consisting of two pieces, that is to say two inner legs spaced apart from one another and oriented in parallel.

When the upper part of the module is placed on the lower part of the module which has the printed circuit board, the primary conductor sections, in particular clipped, previously inserted and connected into the receiving areas of the lower part, i.e. outgoing conductors 10 and return conductors 11, are limited between the legs of the ferrite core section 14 of the upper part and the printed circuit board 35 arranged.

In this case, the outgoing conductor 10 is inserted into a receiving region between two adjacent legs, in particular an outer leg and the next adjacent inner leg of the ferrite core section 13, the line direction being oriented perpendicularly on the plane spanned by the rod-shaped yoke and the inner rod-shaped legs.

The return conductor 11 is accordingly inserted into a receiving area between the two other adjacent legs, in particular the other outer leg and the other inner leg of the ferrite core section 13, which is next adjacent to this, the line direction belonging to the return conductor 11 also being perpendicular to that through the rod-shaped yoke and the inner rod-shaped leg spanned plane is aligned.

The secondary winding 12 is designed as a deformed, in particular quasi-rectangularly running ring winding and is therefore provided wound around the two inner legs of the ferrite core section 13.

On the side of the outgoing conductor 10 and the return conductor 11 facing away from the secondary winding, the respective receiving area is closed off by a respective further ferrite core section 14 arranged in the upper part, which is arranged in a bow-like and / or bridge-like manner as a magnetic cable bridge between the end regions of the respective outer leg and inner one Thigh. Thus, the magnetic field generated by the outgoing conductor 10 and the return conductor 11 can be guided in closed ferrite material. At most a small air gap between the ferrite core section 13 of the lower part and the ferrite core section 14 of the upper part placed on the lower part must be accepted. In this case, plastic material of a plastic carrier part 19 is provided in the air gap, which includes and thus holds the ferrite parts 14.

As in Figure 1 shown, the module is attached to a metal profile 2, which in turn can be attached to a wall or to a system part. The heat-generating components 3 are preferably in heat-conducting contact with the metal profile 2 or a housing part 30 which at least partially surrounds the module, in particular the lower part thereof, is made from a material which is a good heat conductor. Preferably, however, a recess is provided in the housing part 30, through which a heat sink or a metal part projects and is in direct contact with the metal profile 2, the heat sink or the metal part being connected to the heat-conducting component (s) 3, in particular heat-conducting connected is.

The ferrite core sections (13, 14) are also arranged on the side of the printed circuit board 35 facing the metal profile 2, so that their heat can also be supplied to the metal profile 2. The metal profile 2 thus also acts as a heat sink for the ferrite core sections (13, 14).

The metal profile 2 has an S-shaped course, which offers a large cross-sectional area for air flowing past.

In the Figure 2 is a differently shaped metal profile 4 instead of the metal profile 2 Figure 1 used. The metal profile 4 at least partially surrounds the module and thus also has a housing-forming function. The metal profile 4 preferably has a C-shaped profile.

In Figure 3 a cross section through the ferrite core arrangement is shown.

The air gap regions (15, 16, 17, 18) between the respective ferrite core section 14 of the upper part and the respective leg of the ferrite core 13 of the lower part are visible.

The adjustment of the air gaps (15, 16, 17, 18) is made possible in a simple manner. Because of the large areas facing each other at the air gap, the influence of the magnetic resistance of the entire coil core, that is to say ferrite core plus air gaps, is also slight when the air gap changes.

Since the ferrite core sections 14 are provided in the upper part and are preferably cast or encapsulated with plastic of the plastic carrier part 19, this touches in Figure 1 shown plastic layer the legs of the ferrite core section 13. Thus, the air gaps (15, 16, 17, 18) are partially filled by this plastic layer of the plastic carrier part 19. The thickness of the plastic layer is dimensioned such that a non-positive connection is formed. For this purpose, the thickness is selected to be somewhat larger than the air gap actually existing between the ferrite parts, so that an elastic deformation of the plastic layer is necessary when plugging in, and this creates a non-positive connection area between the upper part and lower part.

As in Figure 6 shown, outgoing conductor 10 and return conductor 11 are arranged in the cable routing of the lower part in such a way that an antenna 21 arranged on the lower part, in particular on the printed circuit board 35, is positioned between the forward conductor 10 and return conductor 11 after the upper part has been placed on it. The antenna 21 is spaced from the ferrite coil core in the conductor direction.

The antenna 21 has a flat winding, the winding axis of which is oriented perpendicular to the plane spanned by the outgoing conductor 10 and return conductor 11. The flat winding of the antenna 21 is implemented by means of conductor tracks of a piece of printed circuit board which is spaced apart from the printed circuit board 35 and is aligned parallel to the latter. The circuit board section is held by means of the electrical connecting contacts which are arranged on the circuit board section and which are soldered to the circuit board 35.

The magnetic field generated by the antenna 21 induces electrical currents in the outgoing conductor 10 and return conductor 11, so that a higher frequency current component can be superimposed on the primary current. In this way, data signals can be transmitted from the module to a unit connected to the primary conductor system. A reversed data stream is also made possible by demodulating a high-frequency component.

The module has a connector part 91, by means of which a sensor that can be connected to the connector part 91 can be connected, and a connector part 92, so that a consumer, for example an actuator, such as an electric motor, electric drive or the like, of the electronic circuit arranged on the printed circuit board 35 controlled supply.

The circuit board 35 is equipped with an electronic arrangement such that the power inductively transmitted from the primary conductor system to the secondary winding 12 can be supplied to the consumer in a controlled manner. For example, a converter or another current control unit is arranged on the printed circuit board 35, so that the current supplied to the consumer can be controlled and / or regulated.

In the direction of the conductor outside the antenna 21 and outside the ferrite coil core, consisting of the ferrite core section 13 and the ferrite core section 14, outgoing conductors 10 and return conductors 11 are arranged as close as possible to one another in order to reduce the radiation of energy, that is to say energy loss.

As in Figure 4 and 5 is shown instead of in the Figures 1 to 3 used ferrite core section 14, a ferrite core section 34 can also be used in the upper part, which is similar to the ferrite core section 33 of the lower part, which instead of the ferrite core section 13 Figures 1 to 3 is used in the lower part. So they are not different but only similar ferrite core sections (13, 14) are used. The spacing of the legs is regular in the ferrite core section (13, 14), so that the similar legs with their legs can be inserted into one another in each of the receiving areas formed between the legs. The secondary winding 12 is arranged wound around the two middle legs of the ferrite core section 33. The rest of the structure is similar to that Figures 1 to 3 and 6 executed.

In the further embodiment according to the invention Figure 6 the antenna 21 is in turn arranged between the outgoing conductor 10 and the return conductor 11, the antenna 21 in turn being connected to the printed circuit board 35 by means of a plug connection.

In Figure 8 is that to the embodiment Figure 6 associated lower part shown in more detail. Here, the ferrite cores 14 are extrusion-coated in the plastic material of the housing of the lower part or are at least provided surrounded by the latter.

The channel-like receiving areas (25, 26) for primary conductors are also formed in the housing part of the lower part. The ferrite cores 14 extend in one area in the direction of the primary line. This area is shorter than the extent of the lower part in the direction of the primary line, in particular it is shorter than half the extent of the lower part.

As in Figure 9 shown, the lower part 22 has a locking lug 40 which snaps into a recess, in particular a grid 41, of the upper part. Thus, the lower part 22 can be positively connected to the upper part 23, in particular can be clipped in when the upper part 23 is placed on the lower part 22.

The upper part 23 is fastened on the rail part 90, in particular screw-connected to it. The lower part 22 has a connector part 91 for a sensor, such as a light barrier sensor or another sensor, and a connector part 92 for a drive.

The connector parts 91 and 92 are preferably electrically connected to the circuit board 35, in particular solder-connected. Thus the signals from the sensor are over Plug connection, comprising the connector part 91 and a corresponding mating connector part, the electronic circuit arranged on the circuit board 35 supplied. A power supply signal, in particular motor current, for an electric drive can thus be controlled by the electronic circuit depending on the sensor signal. The drive has, for example, an electric motor that drives a roller or the like. The motor housing can be connected to the rail part 90, which is permanently installed in the system. As soon as a transport item driven by the roller enters the sensitive part of the light barrier, the electric drive can be activated and deactivated accordingly when it exits. This enables energy-saving driving.

When the system is converted or otherwise modified, the module can be fastened at a different location on the rail part 90 by displacing the module along the primary conductors. It is therefore not necessary to disconnect and reconnect a connector part of the AC voltage supply. The energy is fed to the module inductively from the primary conductor system. Therefore, use in a damp environment or in an explosion-proof environment can be carried out without danger. Only the low-voltage connector parts 91 and 92 are to be designed with a correspondingly high degree of protection or to be replaced by direct electrical cables.

Reference list

• 2 metal profile
• 3 heat-generating components
• 4 metal profile
• 10 primary conductors, especially forward conductors
• 11 primary conductors, especially return conductors
• 12 secondary winding
• 13 ferrite core legs
• 14 ferrite core in the base support
• 15 Air gap or plastic with magnetic permeability similar to air
• 16 Air gap or plastic with magnetic permeability similar to air
• 17 Air gap or plastic with magnetic permeability similar to air
• 18 Air gap or plastic with magnetic permeability similar to air
• 19 Plastic carrier part for ferrite core parts
• 21 Antenna for coupling and decoupling communication signals, especially radio waves
• 22 lower part, in particular active part
• 23 upper part, in particular passive part
• 25 channel-like receiving area for primary conductors, in particular outgoing conductors
• 26 channel-like receiving area for primary conductors, in particular return conductors
• 30 housing
• 33 ferrite core
• 34 ferrite core
• 35 printed circuit board
• 40 latch
• 41 grid
• 90 rail part
• 91 Connector part for sensors, such as light barrier sensor
• 92 Connector part for drive

Claims (14)

1. Energy transmission system comprising a module that can be inductively coupled to a primary-conductor system,
   the primary-conductor system in particular comprising a forward conductor (10) and a return conductor (11),
   the module having a lower part (22) and an upper part (23), the upper part (23) being able to be mounted on the lower part (22) and to be connected thereto,
   the lower part (22) having a printed circuit board (35) fitted with electronic components,
   a first ferrite-core portion (13) being arranged on the printed circuit board (35),
   the first ferrite-core portion (13) in particular being glued to the printed circuit board (35),
   a secondary winding (12) being electrically connected to the printed circuit board (35) and the first ferrite-core portion (13) forming a coil core of the secondary winding (12) together with a further ferrite-core portion (14),
   the further ferrite-core portion (14) and a receiving region (25) for the primary-conductor system, in particular for a portion of the primary-conductor system, being arranged in the upper part (23),
   the primary-conductor system, in particular the forward conductor (10) and the return conductor (11), being able to be clipped into the receiving region (25) arranged on the upper part (23),
   characterised in that
   the further ferrite-core portion (14) is potted or overmoulded using a plastics material of a plastics support part (19) which contacts the legs of the first ferrite-core portion (13) such that an air gap (15, 16, 17, 18) partly filled with the plastics material is arranged between the first ferrite-core portion (13) and the further ferrite-core portion (14),
   the thickness of the plastics layer formed by the plastics material in the air gap (15, 16, 17, 18) being selected to be of such a size that, when the upper part (23) is mounted on the lower part (22), resilient deformation of the plastics layer brings about a frictional connection region between the upper part (23) and the lower part (22).
2. Energy transmission system according to claim 1,
   characterised in that
   the first ferrite-core portion (13) has legs and a yoke, the legs being connected to the yoke, the secondary winding (12) being arranged in a manner wound around at least one leg.
3. Energy transmission system according to at least one of the preceding claims, characterised in that
   the lower part (22) and upper part (23) can be connected in a frictional and form-fitting manner, in particular can be clipped together, in particular by a protruding lug portion being able to be clipped into a recess when the upper part (23) is mounted on the lower part (22).
4. Energy transmission system according to at least one of the preceding claims, characterised in that
   the receiving region (25) is configured like a channel.
5. Energy transmission system according to at least one of the preceding claims, characterised in that
   the forward conductor (10) can be clipped into a receiving region (25) provided for the forward conductor (10) and the return conductor (11) can be clipped into the receiving region (26) provided for the return conductor (11) on the upper part (23).
6. Energy transmission system according to at least one of the preceding claims, characterised in that
   the first ferrite-core portion (13) is configured in a comb-shaped manner, a plurality of spaced-apart legs in particular being arranged on the yoke.
7. Energy transmission system according to at least one of the preceding claims, characterised in that
   the legs arranged on the yoke of the first ferrite-core portion (13) are regularly spaced apart from each other,
   the further ferrite-core portion (14) is structurally identical to the first ferrite-core portion (13).
8. Energy transmission system according to at least one of the preceding claims, characterised in that
   when the upper part (23) is mounted on the lower part (22), the first ferrite-core portion (13) and the further ferrite-core portion (14) form a substantially annular coil core,
   the plastics material in particular being overmoulded around the further ferrite-core portion (14).
9. Energy transmission system according to at least one of the preceding claims, characterised in that
   a portion of the forward conductor (10) and a portion of the return conductor (11) can be connected, in particular clipped, into respective corresponding receiving regions (25, 26) on the upper part (23).
10. Energy transmission system according to at least one of the preceding claims, characterised in that
    an antenna configured as a flat winding is arranged between the forward conductor (10) and the return conductor (11), the winding axis being oriented perpendicularly on the plane spanned by the forward conductor (10) and the return conductor (11), in particular in the region closest to the antenna,
    it being possible, by means of the antenna, to modulate and/or demodulate a higher-frequency data transmission signal in comparison with the frequency of the power signal supplied in the primary-conductor system.
11. Energy transmission system according to at least one of the preceding claims, characterised in that
    the flat winding of the antenna is configured on a printed circuit board piece,
    the printed circuit board piece in particular being arranged in parallel with the printed circuit board (35) and the terminals of the antenna being electrically connected to conductor track portions of the printed circuit board (35),
    the antenna or the printed circuit board piece in particular being able to be electrically connected to the printed circuit board (35) by means of a plug-in connection.
12. Energy transmission system according to at least one of the preceding claims, characterised in that
    the further ferrite-core portion (14) is arranged in the upper part (23) in a potted or overmoulded manner, the overmoulded or potted plastics material in the gap, in particular the air gap (15, 16, 17, 18), being arranged between the first ferrite-core portion (13) and the further ferrite-core portion (14).
13. Energy transmission system according to at least one of the preceding claims, characterised in that
    the upper part (23) can be latched or clipped into the lower part (22), in particular by the lower part (22) having a snap-in lug (40) that can latch or clip into a corresponding recess, in particular a notch (41), on the upper part (23).
14. Energy transmission system according to at least one of the preceding claims, characterised in that
    the upper part (23) can be latched or clipped into the lower part (22) at at least two spaced-apart points, in particular at two points spaced apart from one another in the primary-conductor direction, in particular by the lower part (22) having a snap-in lug (40) that can latch or clip into a corresponding recess, in particular a notch (41), on the upper part (23).

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