DE102004051505B4 - Arrangement of coils - Google Patents

Abstract

arrangement of coils (Sx, Sy, Sz) on a common induction core (11), their winding surfaces are approximately perpendicular to each other, consisting of the common Induction core (11) and the directly applied thereto coils (Sx, Sy, Sz), wherein the common induction core (11) metallizations (12) for separate electrical contacting of the individual coils (Sx, Sy, Sz).

Description

The The invention relates to an arrangement of coils on a common Induction core according to claim 1 and 6, whose winding surfaces in approximately perpendicular to each other.

A Such arrangement of coils is also referred to as 3D coil, which is used as an antenna. Conventional fasteners of 3D coils see a connection and contact with a ferrite core before, which is usually on a carrier plate is glued from plastic. Finally, the ferrite core and the carrier plate co-wound to realize the 3D coil. This usually leads that the 3D coils produced by this process a considerable amount claim. About that In addition, it is necessary to the carrier plate to make contact with the coils.

The German patent application DE 197 18 423 discloses a portable signal receiver with three separate coils arranged perpendicular to each other. The receiving power of the receiver is thereby independent of its angular position to a transmitting antenna.

The German patent application DE 101 62 907 shows a remote access device with inductive multi-frame antenna for improved signal reception. For this purpose, three coils arranged perpendicular to one another are also provided.

The German patent application DE 198 45 649 discloses a keyless entry system for a motor vehicle for securely detecting a transmitter inside and outside an automotive interior. For this purpose, two mutually perpendicular antenna coils are provided.

The Japanese patent JP 2001168930 describes a radio transmitter with a coil which is wound on a magnetic core and electrically contacted. As a result, height and cost of mounted on a circuit board assembly are reduced.

The Japanese patent JP 11186041 describes a method of manufacturing a coil element with improved inductance. The turns of the coil are thereby produced by applying a silver film on a ferrite core, which is subsequently processed with a laser.

The German patent application DE 2 054 457 discloses a high frequency transformer with a largely miniaturized coil. Their turns are printed as printed conductors in adjacent circular or angular tracks on a circuit board, wherein a magnetic core passes through the windings across the board.

From the DE 103 24 847 A1 For example, there is known a pillar profile ferrite core receiving antenna and three antenna coils, each of which coils is formed by winding an electric wire around the core, and a leading end of the second antenna and a terminal end of the first antenna are connected together.

The WO 03/071068 A1 proposes an induction coil comprising a ferrite core and a wire wound around the ferrite core, wherein a part of the turns of the wire is mechanically connected to a part of the surface of the ferrite core.

Of the mentioned above Although prior art shows approaches for one Miniaturization of individual coils. Serious attempts to record these results To transmit three-dimensional arrays of coils failed so far but at the three-dimensional requirements. In the episode were also more manageable - downsized or especially flat - transmitter for use eg with immobilizers or locking systems not realizable on vehicles.

It The object of the present invention is an arrangement of coils to provide, through which a usually required space is further reduced, and easy and inexpensive to produce is.

These The object is achieved by an arrangement of the type mentioned, the from the common induction core and the directly applied thereto Coils exist, with the common induction core metallizations For separate electrical contacting of the individual coils.

One essential point of this solution is that by eliminating a commonly provided support plate the height of 3D coils about one-third, so be significantly reduced can. The coils are now directly on a common induction core, preferably a ferrite core applied. The contacts are made by metallizing the ferrite. The surprising simple solution lets the support plate omitted, to which the Fer rit the coil is usually glued. At a considerable height can be dispensed with.

By suitable contacting of the ferrite with the coil wires it is achieved that an SMD (Surface Mounted Device) solderable component is produced, which is easy to handle and easy to integrate on a circuit board. In conjunction with the Compared with conventional 3D coils of lower overall height, higher degrees of freedom in design are created, in particular for identification encoders (ID encoders) of keyless entry systems (Keyless Go systems). The 3D coil can also be used for any other type of inductive energy transfer. By eliminating the carrier plate, it also represents a cost effective alternative to conventional technology.

advantageous Further developments of the arrangement are in the dependent claims 2 to 4 indicated.

A advantageous embodiment sees a cylindrical Embodiment of the induction core with longitudinal recesses for Picking up the turns of x and y coils, over the circumference thereof Windings of a z-coil run. This represents a particularly compact Embodiment of a 3D coil, which is simple and buildable.

Prefers are the metallizations on one end face of the induction core arranged as the contact surface serves with a circuit board. This is a defined interface to Board, whereby a complex wiring of the coils with the Board is avoided.

Especially preferred are the metallizations for use in a ball grid array arranged. This will create a defined port for fast recording the 3d coil provided on the board.

By the use of the arrangement described above in a portable signal receiver additional benefits arise. 3D coils are already being used today, for example for ID donors used by keyless go systems. But because their height is very high, the shape of the encoder is relatively large. Especially for stations these systems can be therefore achieve a significant reduction in the dimensions. It Thus, for example, smaller (vehicle) ID encoders in the form of a key or a card or in any other forms feasible. Farther It is conceivable that the coils are used in other applications come.

The Task is also by an arrangement of the type mentioned solved, in which the induction core is applied to a circuit board and with this is wound together, wherein the circuit board openings for performing the Windings and metallizations for electrically contacting the having individual coils.

One essential point of these alternatives and also surprising simple solution Again, that is due to the omission of one provided support plate the height of 3D coils is greatly reduced. It arise while already above described advantages. Since the induction core without further intermediate steps is applied directly to the board, is the method of manufacture Such a fastening arrangement also simpler and cheaper.

Preferably the induction core has the already described cylindrical Shape up, with longitudinal recesses is provided for receiving the windings of x and y coils, and over the Circumference windings of a z-coil run. Such a 3D coil poses Here is a particularly compact design, easy is constructed and buildable.

It It is understood that the above and below to be explained features not only in the specified combination, but also in other combinations are usable. The frame of the present Invention is defined only by the claims.

The Invention will be described below with reference to an embodiment with reference to the associated Drawings closer explained. The same or equivalent parts are given the same reference numbers provided, waived their multiple representation for reasons of symmetry has been. Show it:

1 an inventive arrangement of coils on a common induction core, and

2 an arrangement of coils incorporating a circuit board.

1 shows an inventive arrangement 1 of coils Sx, Sy, Sz on a common induction core 11 , The turns of the coils Sx and Sy run in crosswise mirror-inverted recesses 13 which are arranged on the longitudinal side (perpendicular to the plane of the page) on the illustrated induction core. In the frontal corner regions of the induction core are also crosswise symmetrically arranged metallizations 12 for contacting the coils Sx, Sy, Sz provided, with which the coil wires are electrically connected. By this arrangement 1 can be dispensed with a carrier plate, whereby a significantly lower height compared to conventional 3D coils is achieved. At the same time, the arrangement 1 is easy to handle and easy to apply to a circuit board, in particular by the placement of the metallizations shown here 12 for use in a ball grid array.

2 an arrangement of coils under one relationship of a circuit board 20 , The induction core 11 ' similar to the one 1 is without a usual support plate on the board 20 applied and wound together with this. The turns of the induction core 11 Dotted x and y coils shown thereby occur perpendicular to the sheet plane through openings 21 in the board 20 , The wires of each coil are metallized in a next step 22 , which should be here connection points of traces on the board, contacted. The arrangement also has a significantly reduced height compared to conventional 3D coils and is also easy and inexpensive to manufacture.

Both Arrangements of coils reduce the space usually required for a 3D coil. The arrangements are easy to manufacture and inexpensive. transmitter or receiver in particular, keyless go systems can be significantly reduced and by flexible shaping to the respective needs customize a user.

10

coil assembly

11

induction core

12

metallization

13

recesses

20

circuit board

21

conductor tracks

22

openings

Sx

x-coil

sy

y coil

sz

z coil

Claims (7)

Arrangement of coils (Sx, Sy, Sz) on a common induction core ( 11 ) whose winding surfaces are approximately perpendicular to each other, consisting of the common induction core ( 11 ) and the coils (Sx, Sy, Sz) applied directly thereto, the common induction core ( 11 ) Metallizations ( 12 ) for separately electrically contacting the individual coils (Sx, Sy, Sz). Arrangement according to claim 1, characterized in that the induction core ( 11 ) cylindrical and with longitudinal recesses ( 13 ) for receiving the turns of x and y coils (Sx, Sy) and extending over its circumference turns of a z-coil (sz). Arrangement according to claim 2, characterized in that the metallizations ( 12 ) at one end face of the induction core ( 11 ) arranged as a contact surface with a circuit board ( 20 ) serves. Arrangement according to one of the preceding claims, characterized in that the metallizations ( 12 ) are arranged for use in a ball grid array. Use of an arrangement of coils (Sx, Sy, Sz) according to one of the preceding claims in a portable signal receiver, in particular for a keyless Access system. Arrangement of coils (Sx, Sy, Sz) on a common induction core ( 11 ' ) whose winding surfaces are approximately perpendicular to each other, wherein the induction core ( 11 ' ) on a board ( 20 ) is applied and wound together with this, wherein the board ( 20 ) Openings ( 21 ) for carrying out the windings, as well as metallizations ( 22 ) for electrically contacting the individual coils (Sx, Sy, Sz). Arrangement according to claim 6, characterized in that the induction core ( 11 ' ) cylindrical and with longitudinal recesses ( 13 ) for receiving the turns of x and y coils (Sx, Sy) and extending over its circumference turns of a z-coil (sz).