EP1606869B1 - Transmitter head and a system for contactless energy transmission - Google Patents

Abstract

A transmitter head for a system for contactless energy transmission includes a support connected to at least one ferrite core. The ferrite core is embodied at least partially in the E-form and a flat winding is arranged around one leg of the E.

Description

The invention relates to a transmitter head and a system for contactless energy transfer.

From the DE 100 53 373 A1 a device for contactless energy transfer is known. In this case, a transformer head is described, which allows inductive energy transmission and has a number of turns.

From the DE 44 46 779 C2 and the DE 197 35 624 C1 is a system for contactless energy transfer known, the route consists of a stationary arranged center conductor and aluminum profile as a return line. The center conductor is surrounded by a movable along the center conductor U-shaped core of the transmitter head. At the U-shaped core, a winding is provided. Overall, the transformer head requires a large volume of construction.

From the WO 92/17929 is also a system for non-contact energy transmission, wherein the transmission path consists of a forward and a return line in the form of line conductors. In this case, the transformer head designed with an E-shaped core and a winding arranged on the middle leg of the E-shaped core also requires a large volume of construction.

From the DE 197 46 919 A1 is a flat arrangement is known, however, has a low efficiency in energy transfer result.

The invention is therefore the object of developing a system for non-contact energy transfer in such a way that in a cost effective manner a smaller volume of construction is needed.

According to the invention the object is achieved in the transmitter head according to the features specified in claim 1 and in the system according to the features specified in claim 3.

Essential features of the invention in the transmitter head are that the transmitter head for a system for contactless energy transmission comprises a carrier which is connected to at least one ferrite core, wherein the ferrite core is at least partially E-shaped and arranged the flat winding around a leg of the E around is. In particular, the transmitter head for an electrical power transmission device is designed with a primary conductor arrangement of at least two mutually parallel primary conductors and at least one electromagnetically coupled secondary winding assembly which is mechanically separated from the primary conductor assembly and movable in the longitudinal direction, wherein the secondary winding assembly has at least one secondary coil as Flat winding is formed and which lies in a plane which is parallel to the primary conductor arrangement receiving plane, wherein the transmitter head comprises a carrier which is connected to at least one ferrite core, wherein the ferrite core is at least partially E-shaped and the flat winding to a leg of the E-shaped ferrite core is provided around.

According to the flat winding is designed as a conductor on a multi-layer board. The advantage here is that a special cost-effective production of the transmitter head can be achieved.

According to the invention, the board is also equipped with electronic components. The advantage here is that the number of components can be reduced, in particular the number of means for electrical and / or mechanical connection can be reduced.

The advantage here is that the transmitter head is very flat, inexpensive and requires a small volume of construction. In addition, the efficiency in the energy transfer is much higher, since the E-shaped design leads the field lines so that less stray fields arise and the majority of the field lines generated by the primary lines is passed through the ferrite core with the legs of the E.

In an advantageous embodiment, the primary conductors are formed as line conductors, or the primary conductors are designed as flat conductors whose surface normal are perpendicular to the plane receiving the secondary winding arrangement. The advantage here is that high current densities are achievable, stranded material is usable and thus the skin effect can be reduced.

In an advantageous embodiment, the secondary winding arrangement is arranged on the underside of the floor of a vehicle. The advantage here is that a rail system is just as usable as a railless system.

In an advantageous embodiment, the secondary winding arrangement is embedded in a potting compound. The advantage here is that a high degree of protection can be achieved.

In an advantageous embodiment, the primary conductor arrangement is arranged stationary in the near-surface region of a travel path. The advantage here is that a high efficiency in energy transfer can be achieved.

In an advantageous embodiment, the primary conductor arrangement is at least partially formed from stranded material. The advantage here is that the skin effect can be reduced.

In an advantageous embodiment, the circuit board is connected to a housing part comprising a cooling device. In particular, the cooling device has cooling ribs and / or cold fingers. The advantage here is that the heat from the housing part to the cooling device can be forwarded.

Essential features of the invention in the system for contactless energy transfer with a transmitter head according to at least one of the preceding claims, are that two line conductors are laid in the ground with a mutual distance A, wherein the distance of the transmitter head from the ground between 0.05 * A and 0 , 2 * A is. The advantage here is that with very low volume large services are transferable.

Further advantages emerge from the subclaims.

LIST OF REFERENCE NUMBERS

1

carrier

2

ferrite Cores

3

Location of a multilayer board

4

Location of a multilayer board

5

Location of a multilayer board

21

housing part

22

cooling fins

23

electronic components

31

ferrite

32

Plastics molding

33

braid

41

ground

42

line cable

43

housing part

FROM

distance

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

In the FIG. 1a an inventive transformer head is shown, wherein in FIG. 1b an enlarged section of the left end portion is shown. It is flat and requires a small volume.

In this case, ferrite cores 2 are applied to the carrier 1 and connected, in particular as an adhesive bond or as a releasable connection, such as screw or the like.

At the ferrite cores 2, a multi-layer board with layers (3, 4, 5) is provided which carry as flat windings formed conductor tracks made of copper and thus are executed on the board.

According to the invention, in particular according to FIGS. 1a and 1b , while a multi-layer board (3,4,5) is used, which has a spiral winding in several levels. The line of the current not only runs in a single spiralfömigen respective level but the line alternates between the levels to reduce the skin effect. This means that advantageously takes place after a short trace section a change to a next level of the board, there again a short trace section is traversed and then changed again. In this way, a quasi-twisted current conduction, which corresponds to the basic principle of a strand, ie a multiple bundle of mutually insulated executed power lines. The resulting winding is thus carried out quasi-twisted.

In FIG. 2 the entire structure of the transformer head with the winding-carrying board is shown. The board also carries electronic components 23 and has the necessary interconnects.

The board and the ferrite cores 2 are connected to a housing part 21, which also has cooling fins 22 for heat dissipation.

In FIG. 3 another technical example is shown, which does not belong to the invention. Here are on the ferrite core 31 plastic moldings 32, in the wells, the strands 33 are embedded. In FIG. 3a the strands are missing. In the upper left half of the Figures 3 and 3a is a symbolic section through the plastic moldings 32 shown with the hint of two inserted strands 33rd The plastic moldings 32 facilitate the insertion of the strands 33. The ferrite core 31 is E-shaped and the winding is carried out around the middle leg of the E around. The three legs of the E are very short, especially as short as the height of the winding is.

In the FIG. 4 the part for inductive energy transfer of the system is shown. In this case, two line conductors 42 made of strand are inserted in the bottom 41, which have a mutual distance A of 140 mm. In other embodiments of the invention, values of 100 mm to 200 mm are also advantageous.

The flat, provided in a housing part 43 transformer head has a maximum distance B to the bottom 41 of 15 mm, that is about one tenth of the distance A of the line conductors. Instead of a tenth, values between 7% and 12% are advantageous.

These mentioned geometric features are achieved in the invention by the winding is made flat. The lines of the winding lie in one plane and do not cross each other.

In other technical examples, the plastic molded parts 32 are designed as modules which can be arranged next to one another and whose recesses are designed in such a way that the stranded wire can be inserted either in straight lines or in circular arc pieces. For this purpose, both the straight and the kreisbogenfömigen courses are impressed as a depression in the original plastic part such that increases remain, which are partially interrupted to each other, so not all connect directly to each other.

The transmitter head is installed in a relative to the ground relatively movable vehicle or machine part, which is not shown in the figures.

Advantageously, the inventive system for non-contact energy transmission works according to the in the DE 44 46 779 C2 . DE 100 53 373 A1 and or DE 197 35 624 C1 specified electronic and electrical characteristics and is executed accordingly. In contrast to these documents, however, the power transmission, in particular the transmitter head, designed with a particularly low volume.

Claims (12)

1. A transmitter head for a system for contact-less energy transmission,
   which is provided with a primary-conductor arrangement comprising at least two primary conductors (42) extending parallel to each other and at least one secondary-winding arrangement which is coupled electromagnetically to the latter and which is movable in a manner mechanically separate from the primary-conductor arrangement and in the longitudinal direction of the latter,
   wherein a secondary coil of the secondary-winding arrangement is constructed in the form of a flat winding and which is situated in a plane which is situated parallel to the plane embracing the primary-conductor arrangement [and] is embraced by the transmitter head,
   wherein the transmitter head comprises a support (1) and at least one ferrite core (2) connected to the latter,
   wherein the ferrite core (2) is made E-shaped at least in part and the flat winding is provided around an arm of the E-shaped ferrite core (2),
   wherein the support is a circuit board (3, 4, 5) which supports the winding and, in addition, also electronic components,
   wherein the circuit board (3, 4, 5) is multiple-layered and has a spiral winding in a multiplicity of planes,
   wherein the line of the flat winding changes into an adjacent layer of the circuit board in each case after conducting-track portions which are so short that the skin effect is reduced.
2. A transmitter head according to Claim 1, characterized in that the three arms of the E are made as short as the height of the winding.
3. A system for contact-less energy transmission,
   with a primary-conductor arrangement comprising at least two primary conductors (42) extending parallel to each other and at least one secondary-winding arrangement which is coupled electromagnetically to the latter and which is movable in a manner mechanically separate from the primary-conductor arrangement and in the longitudinal direction of the latter,
   wherein the secondary-winding arrangement has at least one secondary coil which is constructed in the form of a flat winding and which is situated in a plane which is situated parallel to the plane embracing the primary-conductor arrangement and is embraced by a transmitter head,
   wherein the transmitter head comprises a support (1) and at least one ferrite core (2) connected to the latter,
   wherein the ferrite core (2) is made E-shaped at least in part and the flat winding is provided around an arm of the E-shaped ferrite core (2),
   wherein the support is a circuit board (3, 4, 5) which supports the winding and, in addition, also electronic components,
   wherein the circuit board (3, 4, 5) is multiple-layered and has a spiral winding in a multiplicity of planes,
   wherein the line of the flat winding changes into an adjacent layer of the circuit board in each case after conducting-track portions which are so short that the skin effect is reduced.
4. A system according to Claim 3, characterized in that the primary-conductor arrangement (42) is formed at least in part from strand material.
5. A system according to Claim 3 or 4, characterized in that a capacitor is connected in parallel to the winding, so that the associated resonance frequency corresponds to the medium frequency fed into the primary conductor (42).
6. A system according to at least one of the preceding Claims 3 to 5, characterized in that the primary conductors (42) are constructed in the form of line conductors, or the primary conductors (42) are constructed in the form of flat conductors, the surface normals of which are at right angles to the plane embracing the secondary-winding arrangement.
7. A system according to at least one of the preceding Claims 3 to 6, characterized in that the secondary-winding arrangement is arranged on the underside of the floor of a vehicle.
8. A system according to at least one of the preceding Claims 3 to 7, characterized in that the secondary-winding arrangement is embedded in a cast compound.
9. A system according to at least one of the preceding Claims 3 to 8, characterized in that the primary-conductor arrangement (42) is arranged stationary in the region of a roadway close to the surface.
10. A system according to at least one of the preceding Claims 3 to 9, characterized in that the circuit board (3, 4, 5) is connected to a housing part (21) embracing a cooling apparatus.
11. A system according to at least one of the preceding Claims 3 to 10, characterized in that the cooling apparatus has cooling ribs (22) and/or cooling fingers.
12. A system according to at least one of the preceding Claims 3 to 11, characterized in that two line conductors (42) are located in the floor at a mutual distance (A), wherein the distance of the transmitter head from the floor amounts to between 0·05 * A and 0·2*A.

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