DE102006044060A1 - Two or multidimensional coil arrangement for wireless energy feeding to e.g. sensor, has two resonance coils attached on central coil body and/or core, where ferrite pieces are fastened on edge regions of coil body and/or core - Google Patents

Abstract

The arrangement has two resonance coils attached on a central coil body and/or core (1) made of a magnetically effective material, where the central coil body and/or core is provided on the top side of the arrangement. Coil windings of the resonance coils are arranged right-angled to each other and cut each other in a common point. Ferrite pieces are fastened on edge regions (2-5) of the coil body and/or core. An independent claim is also included for a method for reducing the couplings between resonance coils with two or multidimensional coil arrangement.

Description

The The invention relates to a two- or more-dimensional winding arrangement according to the generic term of claim 1 and to methods for reducing the couplings between resonant windings according to the generic terms the claims 3 and 4. The invention can, for example, for wireless energy feed used by sensors and actuators or any other electronics become.

• – wobei mindestens eine von einem mittelfrequenten Oszillator gespeiste Primärwicklung vorgesehen ist, welche ein mittelfrequentes Magnetfeld erzeugt, um derart Näherungssensoren drahtlos mit elektrischer Energie zu versorgen (Primärfeld),
• – wobei jeder Näherungssensor mindestens eine zur Energieaufnahme aus dem mittelfrequenten Magnetfeld geeignete Sekundärwicklung aufweist,
• – wobei jeder Näherungssensor mit einer Sendeeinrichtung ausgestattet ist, welche interessierende Sensor-Informationen beinhaltende Funksignale an eine zentrale, mit einem Prozessrechner der Maschine verbundene Empfangseinrichtung abgibt.

From the DE 199 26 799 A1 are a method or an arrangement respectively a system for the wireless supply of a plurality of proximity sensors (eg, mounted on a machine, in particular automatic manufacturing machine) known,

• Wherein at least one primary winding fed by a medium-frequency oscillator is provided, which generates a medium-frequency magnetic field in order to supply such proximity sensors wirelessly with electrical energy (primary field),
• Each proximity sensor having at least one secondary winding suitable for absorbing energy from the medium-frequency magnetic field,
• - Wherein each proximity sensor is equipped with a transmitting device which outputs sensor information containing interest radio signals to a central, connected to a process computer of the machine receiving device.

For the generation the magnetic field (primary field) serve two or three orthogonal arranged primary windings. additionally For the realization of a "spot effect", at least one, at least one secondary winding a proximity sensor provided locally influencing primary winding be.

The Proximity sensors are using two or three to absorb energy from a medium frequency Provided magnetic field suitable orthogonal secondary windings, which are connected with a resonance capacitor and with an AC / DC controller, which charges an energy store.

From the DE 199 26 562 A1 is a corresponding method or an arrangement or a system for a variety of actuators known.

From the DE 100 55 404 A1 an arrangement for generating electrical energy from a magnetic field is known, comprising a three-dimensional winding arrangement, formed from a central, cube-shaped core of a magnetically active material, on which at least three windings are applied, the winding axes are each arranged at right angles to each other and in a common Cut point. The core may have grooves for receiving the windings. Each of the three windings is connected with a resonant capacitor to a resonant circuit and connected to a rectifier from which the available output power can be taken off.

in the Ideally, the coupling between the two or three is orthogonal arranged windings zero, in practice occur conditionally Asymmetries in the windings and / or in the core, however, always couplings between the windings. For example, winding asymmetries occur through tolerances on the strand diameter. A homogeneous winding technique is therefore not achievable. These usually always present Couplings cause a drastic reduction of the achievable output power by 50% and more.

Of the Invention is based on the object, a two- or multi-dimensional Winding arrangement with a central bobbin or core, on which at least two orthogonal windings are applied, in which the coupling between the windings as possible is small.

These The object is achieved in conjunction with the features of the preamble according to the invention solved specified in the characterizing part of claim 1 features.

Of the The invention is further based on the object, an optimal Method for reducing the coupling between resonant windings specify.

These Task is alternatively in conjunction with the features of the preamble according to the invention the features stated in the characterizing part of claim 3 and 4 solved.

The particular advantages of the invention are that by the application of small ferrite pieces existing asymmetries (Core asymmetries Winding asymmetries) can be "bent over", whereby a high reduction of the coupling is achieved. As a result of the reduction The coupling by a factor of three or more results in a significant increase the output power.

Further Advantages will be apparent from the following description.

advantageous Embodiments of the invention are characterized in the subclaims.

The Invention will be described below with reference to the drawing Embodiments explained. It demonstrate:

1 - 5 bobbins or cores provided with ferrite pieces of different numbers,

6 a perspective view of a bobbin or core,

7 a sketch for explaining a first compensation method,

8th a sketch to explain a second compensation method,

9 Sweep curves to explain the second compensation method.

• • Bei der Ausführungsform gemäß 1 ist lediglich der erste Kantenbereich 2 mit einem Ferritstückchen 6 versehen.
• • Bei der Ausführungsform gemäß 2 sind der zweite und der dritte Kantenbereich 3 und 4 mit je einem Ferritstückchen 7 und 8 versehen.
• • Bei der Ausführungsform gemäß 3 sind der erste, der zweite und der vierte Kantenbereich 2, 3 und 5 mit je einem Ferritstückchen 6, 7 und 9 versehen.
• • Bei der Ausführungsform gemäß 4 sind der erste und der zweite Kantenbereich 2 und 3 mit je einem Ferritstückchen 6 und 7 versehen.
• • Bei der Ausführungsform gemäß 5 sind alle vier Kantenbereiche 2, 3, 4, 5 mit je einem Ferritstückchen 6, 7, 8 und 9 versehen.

In the 1 - 5 are shown with Ferrite pieces of different numbers provided bobbins or cores. It is the end face (upper side = the surface opposite the coil terminals) of a bobbin or core 1 to recognize from a magnetically active material (ferrite cube core), wherein on this end face four suitable for mounting ferrite pieces edge portions 2 . 3 . 4 . 5 are trained:

• In the embodiment according to 1 is only the first edge area 2 with a ferrite piece 6 Mistake.
• In the embodiment according to 2 are the second and the third edge area 3 and 4 with one ferrite piece each 7 and 8th Mistake.
• In the embodiment according to 3 are the first, the second and the fourth edge area 2 . 3 and 5 with one ferrite piece each 6 . 7 and 9 Mistake.
• In the embodiment according to 4 are the first and the second edge area 2 and 3 with one ferrite piece each 6 and 7 Mistake.
• In the embodiment according to 5 are all four edge regions 2 . 3 . 4 . 5 with one ferrite piece each 6 . 7 . 8th and 9 Mistake.

The in the 1 - 5 Of course, arrangements shown are only to be understood as exemplary embodiments. The ferrite pieces 6 - 9 Of course, another form, for. B. have a square or circular shape. Also, a plurality of ferrite pieces can be mounted side by side / on top of each other at an edge region. Finally, one is not to mount the ferrite pieces on the edge regions of the end face (top) of the bobbin or core 1 limited, but can make the assembly also at any point of the end face or on other surfaces of the bobbin or core.

In 6 is a perspective view of a bobbin or core shown, wherein the edge portions 2 . 3 . 4 . 5 the face (top) and winding terminals 10 are designated, which at the bottom of the bobbin or core 1 are arranged. The bobbin or core 1 preferably takes three windings, not shown (in the 7 and 8th with the numbers 11 . 12 . 13 designated), whose winding axes are each arranged orthogonal to each other and intersect at a common point, as z. B. in the 3 the aforementioned DE 100 55 404 A1 is shown.

• • XY-Kopplung 27 zwischen erster Resonanzwicklung 11 und zweiter Resonanzwicklung 12,
• • XZ-Kopplung 28 zwischen erster Resonanzwicklung 11 und dritter Resonanzwicklung 13,
• • YZ-Kopplung 29 zwischen zweiter Resonanzwicklung 12 und dritter Resonanzwicklung 13.

In 7 a sketch for explaining a first compensation method is shown. It is a first resonance winding 11 (X-winding), a second resonant winding 12 (Y-winding) and a third resonance winding 13 (Z-winding) to recognize, with these windings 11 . 12 . 13 are each arranged orthogonal to each other and the bobbin or core 1 enclose. In this case, the resonant windings mentioned above and shown in the figures include 11 . 12 . 13 each one ohmic winding resistance. The following couplings occur between the windings:

• • XY coupling 27 between first resonance winding 11 and second resonant winding 12 .
• • XZ coupling 28 between first resonance winding 11 and third resonance winding 13 .
• • YZ coupling 29 between second resonant winding 12 and third resonance winding 13 ,

In the first compensation method, the couplings become 27 . 28 detected by means of an oscillator 22 a sinusoidal signal (eg, 120 kHz) in the first resonant winding 11 is fed and the resulting output signal in the second resonant winding 12 or in the third resonant winding 13 with the help of a measuring instrument, z. B. oscilloscope, 23 is measured. The ratio output signal / feed-in signal is a measure of the couplings occurring 27 and 28 , Subsequently, to capture the coupling 29 by means of the oscillator 22 a sinusoidal signal (eg, 120 kHz) in the second resonant winding 12 is fed and it becomes the resulting output signal in the third resonant winding 13 with the help of the measuring instrument 23 measured. In practice, couplings occur 27 . 28 . 29 in the order of 0.2 to 0.7%.

During the successive successive measurements for the three couplings 27 . 28 . 29 become ferrite pieces 6 to 9 in the under the 1 to 5 shown manner on the bobbin or core 1 to determine if this reduces coupling. Once those ge ferrite piece configuration is found, which is a maximum reduction of all couplings 27 . 28 . 29 causes the ferrite in this optimal configuration permanently on the bobbin or core 1 attached, in particular glued.

In 8th a sketch for explaining a second compensation method is shown. It is the wiring of the resonant windings 11 respectively. 12 respectively. 13 with a parallel resonant capacitor 14 respectively. 15 respectively. 16 to recognize, wherein the three formed resonant circuits on the one hand via a rectifier diode 17 respectively. 18 respectively. 19 and on the other hand are directly connected. The connections of a backup capacitor common to the three resonant circuits 20 are at the same time also the connections for an output-side load 21 ,

In the second compensation method, the compensation or coupling reduction takes place in conjunction with a sweep measurement. This is done using a function generator 25 and a primary winding 24 generates a one-dimensional field, the frequencies of this field linear z. B. in the range of 117.5 to 122.5 kHz are wobbled. The complete with resonant windings 11 . 12 . 13 , Resonance Capacitors 14 . 15 . 16 , Rectifier diodes 17 . 18 . 19 , and backup capacitor 20 equipped and connected to the load bobbin or core 1 is successively rotated by 90 ° in the generated one-dimensional field, wherein by means of a connected to the load terminals measuring instrument 26 Sweep curves are recorded. The orientation of the winding arrangement is such that in each of the three positions, another one of the three resonance windings 11 . 12 . 13 is optimally arranged in the one-dimensional magnetic field for energy transfer.

• • die Wobbelkurve 30 zeigt das Spannungs/Frequenz-Diagramm U/f des X-Kanals (= erste Resonanzwicklung 11) mit Last 21 und ohne Kopplung zu den weiteren Wicklungen,
• • die Wobbelkurve 31 zeigt das Spannungs/Frequenz-Diagramm U/f des freischwingenden Y-Kanals (= zweite Resonanzwicklung 12),
• • die Wobbelkurve 32 zeigt das Spannungs/Frequenz-Diagramm U/f des X-Kanal (= erste Resonanzwicklung 11) mit Last 21 und mit Kopplung zum freischwingenden Y-Kanal (= zweite Resonanzwicklung 12).

In 9 are wobble curves to illustrate the second compensation method shown:

• • the sweep curve 30 shows the voltage / frequency diagram U / f of the X-channel (= first resonance winding 11 ) with load 21 and without coupling to the other windings,
• • the sweep curve 31 shows the voltage / frequency diagram U / f of the free-running Y-channel (= second resonance winding 12 )
• • the sweep curve 32 shows the voltage / frequency diagram U / f of the X-channel (= first resonance winding 11 ) with load 21 and with coupling to the free-running Y-channel (= second resonance winding 12 ).

The resonant frequency FRES is 120 kHz in the exemplary embodiment. As can be seen from the wobble curves, an existing coupling distorts the resonance curve / wobble curve in such a way that a minimum UMIN occurs at the resonance frequency. To compensate for the coupling are ferrite pieces 6 to 9 in the under the 1 to 5 shown manner on the bobbin or core 1 in order to determine whether this reduces the coupling. The measurements must be performed iteratively for the three dimensions of the bobbin or core. Once that configuration is found, which is a maximum reduction of all couplings 27 . 28 . 29 causes the ferrite permanently on the bobbin or core 1 attached, in particular glued.

1

Bobbin or Core of magnetically active material (ferrite cube core)

2

first edge region

3

second edge region

4

third edge region

5

fourth edge region

6

Ferritstückchen

7

Ferritstückchen

8th

Ferritstückchen

9

Ferritstückchen

10

winding connections

11

first Resonant winding (X-winding) including winding resistance

12

second Resonant winding (Y-winding) including winding resistance

13

third Resonant winding (Z-winding) including winding resistance

14

first resonant capacitor

15

second resonant capacitor

16

third resonant capacitor

17

first Rectifier diode

18

second Rectifier diode

19

third Rectifier diode

20

backup capacitor

21

load

22

oscillator

23

gauge (eg oscilloscope)

24

primary

25

function generator

26

gauge

27

XY coupling between first and second resonant winding

28

XZ-coupling between first and third resonance winding

29

YZ-coupling between the second and third resonance winding

30

sweep curve X-channel with load without coupling

31

sweep curve Y-channel free-swinging

32

sweep curve X-channel with load and coupling to the free-running Y-channel

f

frequency

fRES

resonant frequency

U

tension

UMIN

minimum

Claims (5)

Two- or multi-dimensional winding arrangement with a central bobbin or core ( 1 ) of a magnetically active material, on which at least two resonance windings ( 11 . 12 . 13 ) are applied, the winding axes are each arranged at right angles to each other and intersect at a common point, characterized in that ferrite pieces ( 6 - 9 ) on the surface of the bobbin or core ( 1 ), by which the couplings ( 27 . 28 . 29 ) between the resonant windings ( 11 . 12 . 13 ) are reduced. Winding arrangement according to claim 1, characterized in that the ferrite pieces ( 6 - 9 ) on edge areas ( 2 - 5 ) of the bobbin or core ( 1 ), which are located on the winding terminals ( 10 ) located opposite the top. Method for reducing the coupling between resonant windings ( 11 . 12 . 13 ) in a two- or multi-dimensional winding arrangement with a central bobbin or core ( 1 ) of a magnetically active material, on which at least two resonance windings ( 11 . 12 . 13 ), characterized in that in at least one of the resonant windings, a sinusoidal feed signal is fed, that the resulting output signals are measured in the other resonant windings and that ferrite pieces ( 6 - 9 ) on the surface of the bobbin or core ( 1 ) in such a configuration that the couplings caused by the ratio of feed-in signal to output signal ( 27 . 28 . 29 ) between the resonant windings ( 11 . 12 . 13 ) are reduced. Method for reducing the coupling between resonant windings ( 11 . 12 . 13 ) in a two- or multi-dimensional winding arrangement with a central bobbin or core ( 1 ) of a magnetically active material, on which at least two resonance windings ( 11 . 12 . 13 ) are applied, characterized in that the complete with resonance capacitors ( 14 . 15 . 16 ), Rectifier diodes ( 17 . 18 . 19 ) and backup capacitor ( 20 ) and with a load ( 21 ) is successively brought into a one-dimensional magnetic field with rotation of 90 ° each in an aligned manner that by means of a measuring instrument ( 26 ) Sweep curves are recorded and that ferrite pieces ( 6 - 9 ) on the surface of the bobbin or core ( 1 ) are set up in such a configuration that eliminates the minimas arising at resonant frequency in the wobble curves and accordingly the couplings ( 27 . 28 . 29 ) between the resonant windings ( 11 . 12 . 13 ) are reduced. Method for reducing the couplings according to claim 3 or 4, characterized in that the ferrite pieces ( 6 - 9 ) on edge areas ( 2 - 5 ) of the bobbin or core ( 1 ), which are located on the winding terminals ( 10 ) located opposite the top.