Ferrite system

• US 20050005673A1
• Filed: 07/09/2004
• Published: 01/13/2005
• Est. Priority Date: 07/10/2003
• Status: Abandoned Application

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Hillenmayer, Franz, Turban, Peter
• Application Number:
  US10/887,639
• Publication Number:
  US 20050005673A1
• Time in Patent Office: Days
• US Class Current: 73/1.570
• CPC Class Codes: B60C 23/0493 for attachment on the tyre
• CPC Class Codes: H01F 17/062 Toroidal core with turns of coil around it
• CPC Class Codes: H01F 27/263 Fastening parts of the core together
• CPC Class Codes: H01F 30/16 Toroidal transformers
• CPC Class Codes: H01F 38/20 Instruments transformers
• CPC Class Codes: H01F 38/28 Current transformers
• CPC Class Codes: H04B 5/00 Near-field transmission systems, e.g. inductive or capacitive transmission systems
• CPC Class Codes: H04B 5/0043 for taking measurements, e.g. using sensor coils
• CPC Class Codes: H04B 5/0081 with antenna coils loop aerials H01Q7/00
• CPC Class Codes: H04B 5/26 using coils
• CPC Class Codes: H04B 5/73 for taking measurements, e.g. using sensing coils

Abstract

A ferrite system for a sensor for monitoring tire pressure and/or tire temperature, comprises a transformer (3) whose primary coil is in the form of a tire antenna (29) and a stray coil (5), the transformer (3) and the stray coil (5) both being in the form of toroids and the transformer (3) and the stray coil (5) being arranged coaxially on their central axis (M) on a support (7).

Claims

1. A ferrite system for a sensor for monitoring tire pressure and/or tire temperature, comprising a transformer whose primary coil is in the form of a tire antenna and a stray coil, wherein the transformer and the stray coil are both in the form of toroids and the transformer and the stray coil are arranged coaxially on their central axis on a support.

2. The ferrite system according to claim 1, wherein the stray coil is connected in series to a secondary coil of the transformer.

3. The ferrite system according to claim 1, wherein the tire antenna is passed both through the transformer and through the stray coil.

4. The ferrite system according to claim 2, wherein the tire antenna is passed both through the transformer and through the stray coil.

5. The ferrite system according to claim 3, wherein the support has an axial tunnel which is disposed on the central axis and through which the tire antenna is threaded.

6. The ferrite system according to claim 4, wherein the support has an axial tunnel which is disposed on the central axis and through which the tire antenna is threaded.

7. The ferrite system according to claim 1, wherein the support between the transformer and the stray coil is reinforced with a plastic web.

8. A sensor for monitoring tire pressure and/or tire temperature, comprising:

a toroidal transformer whose primary coil is in the form of a tire antenna,

a toroidal stray coil, wherein the transformer and the stray coil are arranged coaxially on their central axis on a support.

9. The sensor according to claim 8, wherein the stray coil is connected in series to a secondary coil of the transformer.

10. The sensor according to claim 8, wherein the tire antenna is passed both through the transformer and through the stray coil.

11. The sensor according to claim 9, wherein the tire antenna is passed both through the transformer and through the stray coil.

12. The sensor according to claim 10, wherein the support has an axial tunnel which is disposed on the central axis and through which the tire antenna is threaded.

13. The sensor according to claim 11, wherein the support has an axial tunnel which is disposed on the central axis and through which the tire antenna is threaded.

14. The sensor according to claim 8, wherein the support between the transformer and the stray coil is reinforced with a plastic web.