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US 8,786,379 B2Granted
Common mode noise filter
AssigneeTDK Corporation
InventorsTakashi Nakagawa, Takeshi Okumura, Toshio Tomonari
Life of this patent
Estimating the term…
Abstract
A common mode noise filter includes: a common mode filter inserted into a pair of signal lines; and a pair of capacitively coupled coils having one ends connected respectively to the corresponding signal lines and the other ends opened. According to the present invention, common mode noise can be removed by a common mode filter, as well as, differential mode noise in a desired frequency band can be removed by a pair of coils whose other ends are opened.
Claims19
A common mode noise filter comprising:
- a plurality of external terminals;
- a common mode filter in a pair of signal lines;
- and
- a pair of coils capacitively coupled to each other, each of the coils having one end connected to an associated one of the signal lines and the other end being free from connection with any of the plurality of external terminals so that the other end is opened.
1 more element
A common mode noise filter comprising:
- a substrate;
- a plurality of external terminals;
- first and second coils magnetically coupled to each other and provided on the substrate;
- and
- third and fourth coils capacitively coupled to each other and provided on the substrate, wherein
- each of the first and second coils has one end paired with each other and connected to an associated one of the plurality of external terminals,
- the third coil has one end connected to the one end of the first coil and the other end being free from connection with any of the plurality of external terminals so that the other end is opened, and
- the fourth coil has one end connected to the one end of the second coil and the other end being free from connection with any of the plurality of external terminals so that the other end is opened.
5 more elements
A common mode noise filter comprising:
- a substrate;
- first and second coils magnetically coupled to each other provided on the substrate;
- and
- third and fourth coils capacitively and magnetically coupled to each other provided on the substrate, wherein
- each of the first and second coils has one end paired with each other,
- the third coil has one end connected to the one end of the first coil and the other end opened,
- the fourth coil has one end connected to the one end of the second coil and the other end opened, and
- each of the one ends of the third and fourth coils is one of an inner circumferential end and an outer circumferential end, and each of the other ends of the third and fourth coils is ether another one of the inner circumferential end and the outer circumferential end.
5 more elements
A common mode noise filter comprising:
- a plurality of external terminals including first to fourth external terminals;
- a first coil having a first end connected to the first external terminal and a second end connected to the second external terminal;
- a second coil having a third end connected to the third external terminal and a fourth end connected to the fourth external terminal;
- a third coil having a first inner circumferential end and a first outer circumferential end, one of the first inner circumferential end and the first outer circumferential end being connected to the first external terminal;
- and
- a fourth coil having a second inner circumferential end and a second outer circumferential end, one of the second inner circumferential end and the second outer circumferential end being connected to the third external terminal, wherein
- the other of the first inner circumferential end and the first outer circumferential end is connected to none of the plurality of external terminals, and the other of the second inner circumferential end and the second outer circumferential end is connected to none of the plurality of external terminals.
4 more elements
Dependencies are inferred from the claim text.