Over-voltage protection device having a coil assembly

Patent metadata

Field	Value
Publication number	US-9640970-B2
Application number	US-201214236985-A
Country	US
Kind code	B2
Filing date	Jul 4, 2012
Priority date	Aug 4, 2011
Publication date	May 2, 2017
Grant date	May 2, 2017

Abstract

The present disclosure relates to an overvoltage-protection device for protecting a high-frequency terminal from overvoltage. Overvoltages can be compensated by a coil arrangement, which includes coils electrically in series with different, increasing inductances. The end of the relatively thinner coil is connected to the high-frequency terminal of a circuit.

First claim

The invention claimed is:

1. An overvoltage-protection device for protecting a high-frequency terminal from overvoltage, comprising:
a coil arrangement including several separate coils, which are electrically connected in series with different, increasing inductances,
wherein a coil with the lowest inductance is connected electromechanically via a first connecting element to the high-frequency terminal, and a coil with the highest inductance is connected either directly via a second connecting element or via a current source or voltage source to a ground potential.

2. The overvoltage-protection device according to claim 1 , wherein cross-sectional areas of the coils with relatively lower inductance is smaller than or equal to cross-sectional areas of directly adjacent or directly contacted coils with relatively larger inductance.

3. The overvoltage-protection device according to claim 1 , wherein the coil arrangement includes several separate coils, which are connected electromechanically to one another in each case via a soldered connection.

4. The overvoltage-protection device according to claim 3 , wherein the electromechanical connection of the separate coils is embodied through solder pads, which are contacted with legs of the coils.

5. The overvoltage-protection device according to claim 1 , wherein a wire diameter of the coils with the relatively lower inductance is smaller than or equal to a wire diameter of the coil with the relatively larger inductance directly electrically contacted with or adjacent to the coils with the relatively lower inductance.

6. The overvoltage-protection device according to claim 5 , wherein a ratio of the inductances of two coils directly electrically contacted with or directly adjacent to one another is between 4 to 1 and 16 to 1.

7. The overvoltage-protection device according to claim 1 , wherein the overvoltage-protection device is disposed on a metallised printed circuit board.

8. The overvoltage-protection device according to claim 7 , wherein a cut-out in the metallisation of the printed circuit board is disposed under the coils.

9. The overvoltage-protection device according to claim 1 , wherein external dimensions of the coil arrangement are between 3 mm and 10 mm, away from a housing and/or from electrically conductive parts.

10. The overvoltage-protection device according to claim 5 , wherein the coils directly electromechanically connected or directly adjacent to one another are arranged orthogonally relative to one another.

11. The overvoltage-protection device according to claim 10 , wherein metallic and/or non-magnetisable but electrically conductive plates which are electrically connected to the ground potential are arranged between the coils directly electromechanically connected or directly adjacent to one another.

12. The overvoltage-protection device according to claim 2 , wherein the cross-sectional area of the coils has a shape of a circle, a rectangle or an oval.

13. The overvoltage-protection device according to claim 2 , wherein the cross-sectional area of the coil wire is rectangular and/or that the coils are manufactured by separating a long rectangle from a metal sheet.

14. The overvoltage-protection device according to claim 1 , wherein the coils with low inductance are wound in such a manner that a thickness of a coil wire determines a capacitance between individual windings of the coils, in that relatively smaller surfaces of the coil wire face towards one another, and/or that coils with high inductance are wound in such a manner that a width of the coil wire determines a capacitance between individual windings of the coils, in that relatively larger surfaces of the coil wire face towards one another.

15. The overvoltage-protection device according to claim 5 , wherein the ratio of the inductances of the two coils directly electrically contacted with or directly adjacent to one another is approximately 8 to 1.

16. The overvoltage-protection device according to claim 1 , wherein the external dimensions of the coil arrangement are 5 mm away from a housing and/or from electrically conductive parts.

17. An overvoltage-protection device for protecting a high-frequency terminal from overvoltage, comprising:
a coil arrangement including several separate coils, which are electrically connected in series with different, increasing inductances,
wherein cross-sectional areas of the coils with relatively lower inductance is smaller than or equal to cross-sectional areas of directly adjacent or directly contacted coils with relatively larger inductance.

18. An overvoltage-protection device for protecting a high-frequency terminal from overvoltage, comprising:
a coil arrangement including several separate coils, which are electrically connected in series with different, increasing inductances,
wherein the overvoltage-protection device is disposed on a metallised printed circuit board.

Assignees

• Fluhrer Christoph
• Gutsche Thomas
• Rohde & Schwarz

Inventors

• Fluhrer Christoph
• Gutsche Thomas

Classifications

• H02H1/04 Primary

  Arrangements for preventing response to transient abnormal conditions, e.g. to lightning {or to short duration over voltage or oscillations; Damping the influence of DC component by short circuits in AC networks} · CPC title

• H01Q1/50 Primary

  Structural association of antennas with earthing switches, lead-in devices or lightning protectors · CPC title