Noise suppression circuit
AssigneeTDK Corporation
InventorMitsunari Suzuki
Life of this patent
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Abstract
A small-sized noise suppression circuit capable of suppressing noise in a wide frequency range is realized. A noise suppression circuit has first and second inductors inserted in series in a first conductive line, and a series circuit configured to have a third inductor and a first capacitor connected in series. One end of the series circuit is connected to a junction of the first and second inductors and the other end is connected to a second conductive line. Even when a coupling coefficient k between the first and second inductors is smaller than 1, by adjusting the value of the inductance of the third inductor in accordance with the value of the coupling coefficient k, an attenuation characteristic which is almost the same as or similar to that in an ideal state is obtained.
Claims12
A noise suppression circuit suppressing normal mode noise transmitted on first and second conductive lines and generating a potential difference between the first and the second conductive lines, comprising:
- first and second inductors inserted in series in the first conductive line and magnetically coupled to each other;
- and
- a series circuit configured to have a third inductor and a first capacitor connected in series, one end of the series circuit being connected to a junction of the first and second inductors, and other end being connected to the second conductive line,
- wherein a coupling coefficient k between the first and second inductors is smaller than 1, and the inductance of the third inductor is set to a value so that a desired noise attenuation characteristic is realized on condition that the coupling coefficient k is smaller than 1.
A noise suppression circuit suppressing normal mode noise transmitted on first and second conductive lines and generating a potential difference between the first and the second conductive lines, comprising:
- first and second inductors inserted in series in the first conductive line and magnetically coupled to each other;
- a series circuit configured to have a third inductor and a first capacitor connected in series;
- and
- fourth and fifth inductors inserted in series in the second conductive line and magnetically coupled to each other,
- wherein one end of the series circuit is connected to a junction of the first and second inductors, and the other end is connected to a junction of the fourth and fifth inductors,
- each of a coupling coefficient k1 between the first and second inductors and a coupling coefficient k2 between the fourth and fifth inductors is smaller than 1, and the inductance of the third inductor is set to a value so that a desired noise attenuation characteristic is realized on condition that each of the coupling coefficients k1 and k2 is smaller than 1.
A noise suppression circuit suppressing normal mode noise transmitted on first and second conductive lines and generating a potential difference between the first and the second conductive lines, comprising:
- first and second inductors inserted in series in the first conductive line and magnetically coupled to each other;
- a series circuit configured to have a third inductor and a first capacitor connected in series;
- and
- fourth and fifth inductors inserted in series in the second conductive line and magnetically coupled to each other and magnetically coupled to the first and second inductors,
- wherein one end of the series circuit is connected to a junction of the first and second inductors, the other end is connected to a junction of the fourth and fifth inductors,
- each of a coupling coefficient k1 between the first and second inductors, a coupling coefficient k2 between the fourth and fifth inductors, a coupling coefficient k3 between the first and fourth inductors, a coupling coefficient k4 between the second and fifth inductors, a coupling coefficient k5 between the first and fifth inductors, and a coupling coefficient k6 between the second and fourth inductors is smaller than 1, and the inductance of the third inductor is set to a value so that a desired noise attenuation characteristic is realized on condition that each of the coupling coefficients k1, k2, k3, k4, k5, and k6 is smaller than 1.
Dependencies are inferred from the claim text.