Filter component for filtering an interference signal

Patent metadata

Field	Value
Publication number	US-10692655-B2
Application number	US-201716308224-A
Country	US
Kind code	B2
Filing date	Jun 12, 2017
Priority date	Jun 10, 2016
Publication date	Jun 23, 2020
Grant date	Jun 23, 2020

Abstract

A filter component for filtering an interference signal. The filter component includes at least one multilayer ceramic capacitor having a main body, in which multiple ceramic layers and internal electrodes are stacked one above another, and connection contacts are arranged at the main body. The ceramic layers include a lead lanthanum zirconate titanate ceramic, for example.

First claim

The invention claimed is:

1. A filter component for filtering an interference signal, comprising at least one multilayer ceramic capacitor having a main body, in which a plurality of ceramic layers and internal electrodes are stacked one above another, wherein connection contacts are arranged at the main body, wherein a ceramic material of the ceramic layers is of the formula
Pb (1−1.5a−0.5b+1.5d+e+0.5f) A a B b (Zr 1−x Ti x ) (1−c−d−e−f) Li d C e Fe f Si c O 3 +y·PbO,

wherein A is selected from a group consisting of La, Nd, Y, Eu, Gd, Tb, Dy, Ho, Er and Yb; B is selected from a group consisting of Na, K and Ag; C is selected from a group consisting of Ni, Cu, Co and Mn; wherein:
0<a<0.12;
0.05≤x≤0.3;
0≤b<0.12;
0≤c<0.12;
0≤d<0.12;
0≤e<0.12;
0≤f<0.12;
0≤y<1; and wherein
b+d+e+f>0.

2. The filter according to claim 1 ,
wherein the electrical capacitance of the multilayer capacitor in a voltage range greater than zero rises as the electrical voltage increases.

3. The filter according to claim 1 ,
wherein the ceramic layers comprise a lead lanthanum zirconate titanate ceramic.

4. The filter component according to claim 1 ,
wherein at least one of the connection contacts comprises Invar.

5. The filter component according to claim 1 ,
wherein at least one of the connection contacts is secured to the main body by a sintered connecting material.

6. The filter component according to claim 1 ,
wherein an external electrode is arranged on at least one outer side of the main body, wherein the external electrode comprises at least one sputtered layer.

7. The filter component according to claim 1 ,
wherein the multilayer capacitor comprises first internal electrodes, which are electrically connected to a first connection contact, second internal electrodes, which are connected to a second connection contact, and third internal electrodes, which are connected to none of the connection contacts.

8. The filter component according to claim 1 ,
wherein at least one load relief region for mechanical load relief is formed in the main body.

9. The filter component according to claim 1 ,
comprising a printed circuit board, wherein the connection contacts are connected to the printed circuit board by a sintered connecting material.

10. The filter component according to claim 9 , comprising a busbar, wherein the printed circuit board is screwed to the busbar.

11. The filter component according to claim 1 ,
wherein the multilayer ceramic capacitor is interconnected between first connections to a voltage supply and second connections to a load.

12. The filter component of claim 1 , wherein at least one of the connection contacts comprises a layered structure of copper-Invar-copper.

13. The filter component according to claim 1 , wherein at least one of the connection contacts is a lead frame.

14. The filter component according to claim 1 , wherein the connection contact is configured in meandering fashion.

15. The filter component according to claim 1 , which is suitable to be used at a temperature of 150° C. or higher.

Assignees

• Tdk Electronics Ag

Inventors

• Beck Fabian
• Böhm Florian
• Konrad Jürgen
• Koini Markus

Classifications

• H03H1/0007

  of radio frequency interference filters · CPC title

• H01G4/1245

  containing also titanates · CPC title

• H05K1/181

  associated with surface mounted components · CPC title

• H03H2001/0085

  Multilayer, e.g. LTCC, HTCC, green sheets · CPC title

• H01G4/30 Primary

  Stacked capacitors (H01G4/33 takes precedence) · CPC title