Importance

Loading Importance Indicators...

Abstract

A noise induced from a switching power supply source or the like is applied to a power line. The noise is classified into two kinds, one of them being normal mode noise appearing between power lines and the other one being common mode noise appearing between a power line and a ground line. Thus, a line filter is required to attenuate these noises. The present invention provides a line filter for attenuating normal mode noise appearing on a power line between a live line and a neutral line as well as common mode noise appearing between the power line and a ground line, wherein the line filter includes a plurality of first inductors interposed between the live line and the neutral line, a first X-capacitor interposed between the live line and the neutral line on the load side relative to the first inductors, a plurality of second inductors interposed between the live line and the neutral line on the load side relative to the first X-capacitor, and a Y-capacitor interposed between the live line and the ground line as well as between the neutral line and the ground line on the load side relative to the second inductors, the Y-capacitor constituting a common mode filter between the first inductors and the second inductors in response to common mode noise.

Loading the Abstract Image...

First Claim