Choke coil for eliminating common mode noise and differential mo

Details Choke coil for eliminating common mode noise and differential mo Choke coil for eliminating common mode noise and differential mo

1995-10-13

1996-12-03

Kozma, Thomas J.

Inductor devices

Plural part core

336181, 336215, 336233, H01F 2726, H01F 2730

Patent

active

055812244

ABSTRACT:
A choke coil which functions not only to eliminate common mode noise but also to eliminate differential mode noise. A couple of coils are wound around a circular first core and a second core which is disposed inside the circular first core. The second core has a circular frame and a bridge which is laid in the frame. The first core may be easy to become magnetic saturation but is made of a material with a large magnetic permeability, and preferably a material with a relative magnetic permeability of several thousand, such as ferrite and amorphous. The second core is made of a material which is hard to become magnetic saturation, and preferably a material with a relative magnetic permeability of some scores to several hundred, such as dust core.

REFERENCES:
patent: 4205288 (1980-05-01), Lin et al.
patent: 4910482 (1990-03-01), Takagai et al.
patent: 5083101 (1992-01-01), Frederick

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