DE102013008276B4 - transponder system - Google Patents

Abstract

A transponder system comprising a stationary transponder (T0), a handset movable along a travel surface, and a primary conductor system laid down in a system for contactless energy transfer to a secondary winding of the handset, the primary conductor system comprising an elongated conductor loop the secondary winding for supplying an energy storage and / or a traction drive of the mobile part, wherein the secondary winding is inductively coupled to the primary conductor loop, wherein the mobile part has a writing and / or reading device, which exchanges data with the transponder (T0), wherein the transponder (T0) is supplied to the antenna oscillator (L, C1) voltage drop or the voltage generated by the transponder (T0) is supplied to the antenna circuit (L, C1), wherein between the antenna circuit (L, C1) and transponder (T0) has a filter capacity (C2) interposed et, such that the current flowing between the antenna resonant circuit and the transponder (T0) is conducted via the filter capacitance (C2), wherein an inductance (L) of the antenna resonant circuit (L, C1) is arranged in an alternating magnetic field whose frequency is at least one hundred times less than the resonant frequency of the antenna resonant circuit (L, C1), wherein the alternating magnetic field is generated by the elongated laid primary conductor loop, wherein the filter capacitance (C2) at least a hundred times greater capacity than the capacitance (C1) of the antenna resonant circuit (L, C1), wherein the frequency This alternating magnetic field is different from the resonance frequency of the antenna resonant circuit, wherein by means of the filter capacitance (C2), the influences of the alternating magnetic field are suppressed.

Description

The invention relates to a transponder system.

It is well known that a data exchange between transponder and transponder reader and / or writer is executable. In this case, data stored in the transponder can be read out from the device or data can be stored in the transponder.

From the EP 1 482 647 B1 a circuit arrangement for phase modulation for backscatter-based transponder is known.

From the DE 10 2007 046 679 A1 is an RFID transponder known.

From US 2010/0148723 A1 a bidirectional wireless power transmission is known.

From the DE 10 2011 115 721 A1 a system for wireless energy transfer is known.

From the DE 697 16 142 T2 As the closest prior art, a wireless transmitter synchronization is known in which a shield is proposed and pointed to its utility.

The invention is therefore based on the object to develop a transponder system, where it should be operational in an alternating magnetic field.

According to the invention the object is achieved in the transponder system according to the features specified in claim 1 or 2.

The advantage here is that by means of the filter capacitance, the influences of an alternating magnetic field can be suppressed, if the frequency of this alternating magnetic field is different from the resonant frequency of the antenna resonant circuit. In this case, the antenna resonant circuit consists of a parallel resonant circuit, which comprises an inductance and capacitance. By means of the filter capacitance, the current component induced in the inductance by the alternating magnetic field can thus be suppressed. This allows the use of transponder technology in environments with high alternating magnetic fields. Such an alternating magnetic field is generated by a primary conductor system which is laid in a system and serves for the inductive supply of mobile parts.

According to the invention, the filter capacity at least a hundred times, in particular a thousand times, greater capacity than the capacitance of the antenna resonant circuit. The advantage here is that a very good suppression of induced by the alternating magnetic field current components can be achieved.

According to the invention, an inductance of the antenna resonant circuit is arranged in an alternating magnetic field whose frequency is at least a hundred times, in particular a thousand times, lower than the resonant frequency of the antenna resonant circuit. The advantage here is that by means of a single filter capacitance, in particular by means of a single filter capacitor, a very good suppression of induced by the alternating magnetic field current components can be achieved.

In an advantageous embodiment, the antenna resonant circuit has an inductance and a capacitance connected in parallel thereto, in particular the antenna resonant circuit is designed as a parallel resonant circuit. The advantage here is that a transponder system according to the prior art only has to be slightly modified in order to function as a system according to the invention.

In an advantageous embodiment, the alternating magnetic field is generated by an elongated primary conductor loop, in particular in which a medium-frequency current is impressed. The advantage here is that a heavy current is providable and thus a handset is inductively supplied contactless with high performance. However, this creates a strong alternating magnetic field. Nevertheless, the transponder according to the invention is effective because the current components induced by the alternating magnetic field can be suppressed by means of the filter capacitance.

In an advantageous embodiment, a mobile part has a secondary winding, in particular for supplying an energy store and / or a traction drive of the mobile part,
wherein the secondary winding is inductively coupled to the primary conductor loop. The advantage here is that the handset is inductive, ie without a conductor rail or the like.

In an advantageous embodiment, the mobile part on a writing and / or reading device, which exchanges data with the transponder, wherein the transponder is arranged stationary. The advantage here is that data stored in the transponder can be read out and / or data can be written to the transponder.

Further advantages emerge from the subclaims. The invention is not limited to the combination of features of the claims. For the skilled person, further meaningful combination options of claims and / or individual claim features and / or features of the description and / or figures, in particular from the task and / or the task posing by comparison with the prior art arise.

• In der 1 ist ein erfindungsgemäßes System schematisch dargestellt.
• In der 2 ist ein Transponder mit Antennenschwingkreis nach Stand der Technik dargestellt.
• In der 3 ist ein erfindungsgemäßer Transponder mit Antennenschwingkreis dargestellt.
• In der 4 ist ein anderer erfindungsgemäßer Transponder mit Antennenschwingkreis dargestellt.

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

• In the 1 a system according to the invention is shown schematically.
• In the 2 a transponder is shown with antenna resonant circuit according to the prior art.
• In the 3 an inventive transponder is shown with antenna resonant circuit.
• In the 4 is another inventive transponder shown with antenna resonant circuit.

As in 1 shown, the inventive system has a strong alternating magnetic field in which a transponder T0 is arranged. The system is a system for non-contact energy transfer from a stationary arranged primary conductor system to an in 1 not shown handset with secondary winding. The mobile part is movable along a travel surface and can be supplied from the secondary winding, in particular its energy store.

The primary conductor system is inductively coupled to the secondary winding and is supplied with a medium-frequency current. The primary conductor system has an elongate laid primary conductor loop, wherein in 1 only the leader 1 and the return conductor 2 the primary conductor loop are shown.

This results in an alternating magnetic field which is medium-frequency, in particular has a frequency between about 10 kHz and about 1 MHz.

A arranged in this area of the alternating magnetic field transponder according to the prior art, as in 1 shown, has an antenna resonant circuit, which consists of a capacitor C1 and one parallel to the capacitor C1 switched inductance L consists. Thus, at the inductance L the transponder induces a voltage from the alternating magnetic field, which can reach an inadmissibly high value, which is why the electronic circuit of the transponder T0 is overridden and thus can not perform a signal exchange with a transponder reader and / or writer.

As in 3 shown, the transponder according to the invention T0 a filter capacity C2 on, which is additionally arranged in the antenna resonant circuit. According to the embodiment according to 3 is the filter capacity C2 this with the inductance L of the antenna resonant circuit connected in series.

In the alternative embodiment according to 4 the voltage dropping at the antenna resonant circuit is controlled by the filter capacitance connected in series with the antenna resonant circuit C2 the transponder T0 fed.

In both embodiments shown, therefore, an additional filter capacity C2 provided in or on the antenna resonant circuit.

In this case, the filter capacitance is dimensioned such that it has a higher impedance for the medium-frequency injected current component than at the operating frequency of the other antenna resonant circuit. Preferably, the resonant frequency of the antenna resonant circuit is in the high-frequency range, in particular in the range of 1 GHz and more. Thus, the operating frequency of the transponder is at least one thousand times or even more than the hundred thousandths of the center frequency.

For example, the inductance L sized between 1 and 10 milli-Henry and the capacity of the antenna resonant circuit between 10 pF and 100 pF. The filter capacitance then attenuates a primary conductor frequency of 25 kHz at a value between 100 nF and 1000 nF.

In a further embodiment of the invention, instead of the filter capacity C2 another filter is provided, in particular a more complex circuit, that is to say a circuit consisting of more than just one capacitor, or an active filter. Furthermore, the embodiment according to the invention with the filter capacitor can also be provided in other coils.

LIST OF REFERENCE NUMBERS

1

go conductor

2

return conductor

T0

transponder

L

Inductance of the antenna resonant circuit

C1

Capacity of the antenna resonant circuit

C2

filter capacity

U

Input voltage at the transponder

ε

Voltage on the antenna resonant circuit

Claims (6)

Transponder system, which - a stationary arranged transponder (T0), - a movable along a travel surface handset and - a relocated in a plant primary conductor system for contactless energy transfer to a secondary winding of the handset, wherein the primary conductor system has an elongated laid primary conductor loop, wherein the mobile part has the secondary winding for supplying an energy store and / or a traction drive of the mobile part, wherein the secondary winding is inductively coupled to the primary conductor loop, wherein the mobile part has a writing and / or reading device which exchanges data with the transponder (T0), the transponder (T0) being supplied with the voltage dropping at an antenna resonant circuit (L, C1) or the voltage generated by the transponder (T0) being supplied to the antenna resonant circuit (L, C1) a filter capacitance (C2) is interposed between the antenna resonant circuit (L, C1) and the transponder (T0), so that the current flowing between the antenna resonant circuit and the transponder (T0) is conducted via the filter capacitance (C2), wherein an inductance (L) of the antenna resonant circuit ( L, C1) is arranged in an alternating magnetic field whose frequency minde is at least one hundred times lower than the resonant frequency of the antenna resonant circuit (L, C1), wherein the alternating magnetic field is generated by the elongated laid primary conductor loop, the filter capacitance (C2) at least one hundred times greater capacity than the capacitance (C1) of the antenna resonant circuit (L, C1 ), wherein the frequency of this alternating magnetic field is different from the resonant frequency of the antenna resonant circuit, wherein by means of the filter capacitance (C2) the influences of the alternating magnetic field are suppressed. Transponder system, which - a stationarily arranged transponder (T0), - a movable along a travel surface handset and - laid in a system primary conductor system for contactless power transmission to a secondary winding of the handset, wherein the primary conductor system has an elongated laid primary conductor loop, wherein the handset the Secondary winding for supplying an energy storage and / or a traction drive of the mobile part, wherein the secondary winding is inductively coupled to the primary conductor loop, wherein the mobile part has a writing and / or reading device, which exchanges data with the transponder (T0), wherein the transponder ( T0) the voltage dropping at an antenna resonant circuit (L, C1) is supplied or the voltage generated by the transponder (T0) is fed to the antenna resonant circuit (L, C1), wherein in the antenna resonant circuit (L, C1) a filter capacitance (C2) is interposed, so that the in the antenna resonant circuit (L, C1) current is passed through the filter capacitor (C2), characterized in that an inductance (L) of the antenna resonant circuit (L, C1) is arranged in an alternating magnetic field whose frequency is at least one hundred times lower than the resonant frequency of Antenna resonant circuit (L, C1), wherein the alternating magnetic field is generated by the elongated laid primary conductor loop, wherein the filter capacitance (C2) at least one hundred times greater capacity than the capacitance (C1) of the antenna resonant circuit (L, C1), wherein the frequency of this alternating magnetic field different is of the resonant frequency of the antenna resonant circuit, wherein by means of the filter capacitance (C2), the influences of the alternating magnetic field are suppressed. Transponder system after Claim 1 or 2 , characterized in that the filter capacitance (C2) has at least a thousand times greater capacity than the capacitance (C1) of the antenna resonant circuit (L, C1). Transponder system according to one of the preceding claims, characterized in that the inductance (L) of the antenna resonant circuit (L, C1) is arranged in the alternating magnetic field whose frequency is at least a thousand times lower than the resonant frequency of the antenna resonant circuit (L, C1). Transponder system according to one of the preceding claims, characterized in that the antenna resonant circuit (L, C1), the inductance (L) and parallel thereto, the capacitance (C1), that is designed as a parallel resonant circuit. Transponder system according to one of the preceding claims, characterized in that in the elongated laid primary conductor loop a medium-frequency current is impressed.

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