Device for the inductive transmission of energy and/or data

• US 20040201468A1
• Filed: 04/28/2004
• Published: 10/14/2004
• Est. Priority Date: 09/09/2002
• Status: Active Grant

• Current Assignee: Continental Automotive GmbH (Continental AG)
• Original Assignee: Siemens AG
• Inventors: Zimmer, Herbert
• Granted Patent: US 7,079,013 B2
• Time in Patent Office: Days
• US Class Current: 340/448
• CPC Class Codes: B60C 23/0413 Wireless charging of active radio frequency circuits
• CPC Class Codes: G06K 19/07749 the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
• CPC Class Codes: G06K 7/0008 General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
• CPC Class Codes: G06K 7/10178 including auxiliary means for focusing, repeating or boosting the electromagnetic interrogation field comparable booster antennas integrated on the record carrier itself G06K19/07794

Abstract

The device has a primary circuit (1) that transmits energy or data via an intermediate circuit (2) to a secondary circuit (3) by means of induction. The intermediate circuit (2) has a very low quality factor. The inductive coupling between the intermediate circuit (2) and the secondary circuit (3) is reduced by inserting an additional leakage inductor (L_s) so that energy or data is transmitted from the primary circuit (1) to the secondary circuit (3) as effectively as possible. This has the effect of lessening the damping effect of the intermediate circuit (2) on the secondary circuit (3).

Claims

1. A device for the inductive transmission of energy and/or data from a primary circuit, comprising at least one transmitting and receiving antenna, to a secondary circuit, comprising a tuned circuit comprising at least one secondary coil and one capacitor, wherein between the primary circuit and the secondary circuit there is arranged an inductive intermediate circuit comprising an antenna that is inductively coupled via a coupling element to both the primary circuit and the secondary circuit, wherein an additional leakage inductor that is inductively decoupled from the secondary coil is arranged in the secondary circuit, and/or the coupling element has a leakage branch, the magnetic flux of which is not at the same time the coupling flux of the secondary circuit and of the intermediate circuit, whereby the inductive coupling between the intermediate circuit and the secondary circuit is reduced, but the overall effectiveness of transmission from the primary circuit to the secondary circuit is improved.

2. The device according to claim 1, wherein the coupling element is formed by a leakage transfer core having at least one coupling branch and one leakage branch, wherein the magnetic flux of the leakage branch is not at the same time inductively coupled with the secondary coil and the antenna.

3. The device according to claim 1, wherein the leakage transfer core is manufactured from a permeable material.

4. The device according to claim 1, wherein the primary circuit and the secondary circuit are designed for the inductive transmission of energy or data in a tire pressure measurement system of a motor vehicle, wherein the primary circuit is arranged onboard the vehicle and the intermediate circuit and the secondary circuit are arranged onboard the tire.

5. An arrangement for transmitting energy and/or data from a primary circuit to a secondary circuit, comprising:

at least one transmitting and receiving antenna in the primary circuit,

a tuned circuit comprising at least one secondary coil and one capacitor in the secondary circuit,

an inductive intermediate circuit, arranged the primary circuit and the secondary circuit, comprising an antenna that is inductively coupled via a coupling element to both the primary circuit and the secondary circuit,

an additional leakage inductor inductively decoupled from the secondary coil and arranged in the secondary circuit, and wherein

the coupling element has a leakage branch, wherein the magnetic flux of the leakage branch is not at the same time the coupling flux of the secondary circuit and of the intermediate circuit, whereby the inductive coupling between the intermediate circuit and the secondary circuit is reduced, but the overall effectiveness of transmission from the primary circuit to the secondary circuit is improved.

6. The arrangement according to claim 5, wherein the coupling element is formed by a leakage transfer core having at least one coupling branch and one leakage branch, wherein the magnetic flux of the leakage branch is not at the same time inductively coupled with the secondary coil and the antenna.

7. The arrangement according to claim 5, wherein the leakage transfer core is manufactured from a permeable material.

8. The arrangement according to claim 5, wherein the primary circuit and the secondary circuit are designed for the inductive transmission of energy or data in a tire pressure measurement system of a motor vehicle, wherein the primary circuit is arranged onboard the vehicle and the intermediate circuit and the secondary circuit are arranged onboard the tire.

9. An arrangement for transmitting energy and/or data from a primary circuit to a secondary circuit, comprising:

at least one transmitting and receiving antenna in the primary circuit,

a tuned circuit comprising at least one secondary coil and one capacitor in the secondary circuit,

an inductive intermediate circuit, arranged the primary circuit and the secondary circuit, comprising an antenna that is inductively coupled via a coupling element to both the primary circuit and the secondary circuit, wherein

the coupling element has a leakage branch, wherein the magnetic flux of the leakage branch is not at the same time the coupling flux of the secondary circuit and of the intermediate circuit, whereby the inductive coupling between the intermediate circuit and the secondary circuit is reduced, but the overall effectiveness of transmission from the primary circuit to the secondary circuit is improved.

10. The arrangement according to claim 9, wherein the coupling element is formed by a leakage transfer core having at least one coupling branch and one leakage branch, wherein the magnetic flux of the leakage branch is not at the same time inductively coupled with the secondary coil and the antenna.

11. The arrangement according to claim 9, wherein the leakage transfer core is manufactured from a permeable material.

12. The arrangement according to claim 9, wherein the primary circuit and the secondary circuit are designed for the inductive transmission of energy or data in a tire pressure measurement system of a motor vehicle, wherein the primary circuit is arranged onboard the vehicle and the intermediate circuit and the secondary circuit are arranged onboard the tire.