US 2006/0220772 A1 · Noise suppressor

Abstract

A noise suppressor capable of obtaining a favorable attenuation characteristic even in the case where a plurality of inductors on a conductive wire are magnetically coupled to each other. The noise suppressor includes a first inductor and a second inductor which are magnetically coupled to each other on a first conductive wire, a third inductor having one end connected to the other end of a first capacitor and the other end of a second capacitor and the other end connected to ground, and a fourth inductor and a fifth inductor which are magnetically coupled to each other on a second conductive wire. While it is considered that the coupling coefficients k1 through k6 between the inductors are smaller than 1 in reality, in particular, on the basis of the condition that the coupling coefficients K1 through k6 are smaller than 1, the inductance of the third inductor is set to a value corresponding to the actual values of the coupling coefficients k1 through k6 so as to obtain a desired noise attenuation characteristic.

Claims7

Dependent claims

A noise suppressor suppressing noise transmitted through a first conductive wire and a second conductive wire, the noise suppressor comprising:

a first inductor and a second inductor which are inserted into the first conductive wire in series with each other and are magnetically coupled to each other;
a first capacitor which has one end connected between the first inductor and the second inductor;
a third inductor which has one end connected to the other end of the first capacitor and the other end connected to ground, and forms a first series circuit together with the first capacitor;
a fourth inductor and a fifth inductor which are inserted into the second conductive wire in series with each other, and are magnetically coupled to each other;
and
a second capacitor which has one end connected between the fourth inductor and the fifth inductor and the other end connected to the one end of the third inductor, and forms a second series circuit together with the third inductor,
wherein a pair of the first and the second inductors and a pair of the fourth and the fifth inductors are magnetically coupled to each other, and
an inductance L3 of the third inductor satisfies the following condition:
L3=(M1+M5)/2 (A-1),
where M1=k1(L1·L2)1/2,
M5=k5(L1·L5)1/2,
L1:
inductance of the first inductor,
L2:
inductance of the second inductor,
L5:
inductance of the fifth inductor,
k1:
coupling coefficient between the first and the second inductor, and
k5:
coupling coefficient between the first and the fifth inductor.

18 more elements

A noise suppressor suppressing noise transmitted through a first conductive wire and a second conductive wire, the noise suppressor comprising:

a first inductor and a second inductor which are inserted into the first conductive wire in series with each other and are magnetically coupled to each other;
a first capacitor which has one end connected between the first inductor and the second inductor;
a third inductor which has one end connected to the other end of the first capacitor and the other end connected to ground, and forms a first series circuit together with the first capacitor;
a fourth inductor and a fifth inductor which are inserted into the second conductive wire in series with each other, and are magnetically coupled to each other;
and
a second capacitor which has one end connected between the fourth inductor and the fifth inductor and the other end connected to the one end of the third inductor, and forms a second series circuit together With the third inductor,
wherein a pair of the first and the second inductors and a pair of the fourth and the fifth inductors are magnetically separated from each other.

4 more elements

Dependencies are inferred from the claim text.

Noise suppressor

Life of this patent

Noise suppressor

Life of this patent

Abstract

Claims7