A common mode filter includes: a body including a filter portion; first and second external electrodes each including an electrode layer including conductive particles, intermetallic compound (IMC) formation particles, and a resin, and disposed on an external surface of the body; and first and second coils disposed in the filter portion, the first and second coils being connected through lead portions to the electrode layers of the first and second external electrodes, respectively. The conductive particles include a first conductive particle and a second conductive particle having a diameter smaller than that of the first conductive particle.

A holder holds a first magnetic member through which the first signal cable is passed and a second magnetic member through which the second signal cable is passed. The holder holds the first magnetic member with a first holding portion including an elastic engagement portion. The holder is also provided with a second holding portion to hold the second magnetic member at a position where the second magnetic member overlaps with the first magnetic member. A restrict portion is arranged on the elastic engagement portion and configured to restrict movement of the second magnetic member held by the second holding portion.

A conductive path with noise filter that enables an effective reduction in a surge noise in a specific frequency band is provided. A conductive path with noise filter includes conductive path main bodies, insulating layers that respectively surround the conductive path main bodies, conductive layers that are respectively provided to correspond to the conductive path main bodies with the insulating layers being sandwiched between the conductive layers and the conductive path main bodies and that respectively form capacitors in combination with the conductive path main bodies, and inductors connected to the conductive layers.

A common mode filter includes a body including a filter portion and an electrostatic protection portion, first to fourth external electrodes disposed on an external surface of the body, a ground electrode disposed on the external surface of the body, a first coil included in the filter portion and electrically connected to the first and second external electrodes, and a second coil included in the filter portion and electrically connected to the third and fourth external electrodes. The electrostatic protection portion includes discharge electrodes electrically connected to at least one of the first to fourth external electrodes and the ground electrode, a discharge part including conductive particles, a first organic-inorganic composite insulating layer disposed on the discharge electrodes and the discharge part, a magnetic cover layer disposed on the first organic-inorganic composite insulating layer, and a first inorganic insulating layer.

A first coil of a common mode choke coil includes first and second loop-shaped conductors in different layers, and an interlayer connection conductor that connects the first and second loop-shaped conductors. The inner and outer diameters of the second loop-shaped conductor are less than or equal to the inner and outer diameters of the first loop-shaped conductor. A second coil includes third and fourth loop-shaped conductors in different layers, and an interlayer connection conductor that connects the third and fourth loop-shaped conductors. The third loop-shaped conductor is outside the first loop-shaped conductor in the same layer as the first loop-shaped conductor, and the fourth loop-shaped conductor is inside the second loop-shaped conductor in the same layer as the second loop-shaped conductor.

Disclosed herein is a common mode filter including: at least four coil layers, each layer having a primary coil and a secondary coil; and discontinuous parts made of an insulating material each extending between starting points of each of the primary coil and the secondary coil positioned on the lowest layer among the coil layers to ending points of each of the primary coil and the secondary coil positioned on the highest layer among the coil layers. The primary coils are connected in series from the lowest layer to the highest layer, and the secondary coils are connected in series from the lowest layer to the highest layer. The common mode filter is able to be miniaturized and has improved impedance characteristics.

The present disclosure provides a wrapping method for the common mode inductor. The common mode inductor includes a first coil winding and a second coil winding. The wrapping method for a common mode inductor includes steps of: disposing two isolation blocking sheets at different positions of a magnetic core; wrapping the first coil winding around the magnetic core, wherein the first coil winding is divided into two wrapping areas by one of the isolation blocking sheets; wrapping the second coil winding around the magnetic core, wherein the second coil winding is divided into two wrapping areas by the other one of the isolation blocking sheets, wherein the first coil winding and the second coil winding are symmetrically wrapped.

A filter device includes a plurality of coils of which central axes are spaced apart from one another and in parallel to one another and a plurality of ground members spaced apart from one another and extending in parallel to the central axes of the coils outside of the coils. Each of the coils is spaced apart from another coil closest thereto by a first distance. Each of the ground members is spaced apart from a coil closest thereto by a second distance. The number of ground members spaced apart from each of the coils by the second distance is the same.

Disclosed herein is a common mode filter that includes a winding core part and first and second wires wound in a same direction around the winding core part. The first and second wires constitute a first winding block on one endmost side in an axial direction of the winding core part, a second winding block on other endmost side in the axial direction of the winding core part, and a third winding block positioned between the first and second winding blocks. The second winding block is a winding block at an odd-numbered position counted from the first winding block. The first and second wires cross each other in an area between the first and third winding blocks and in an area between the second and third winding blocks.

The invention comprises an electrical system apparatus for processing three-phase power, comprising: a first, second, and third inductor connected on a first end to a first common magnetic field carrying plate and connected on a second end to a second common magnetic field carrying plate, where the three inductors are equidistant from each other and/or equidistance from a central axis, which yields an equal coupling common mode inductor-capacitor based filtering apparatus. Generally, inductor placement symmetry and/or equal magnetic field permeabilities between each pair of the three inductors balances magnetic fields within each inductor at each point of time, where each of the three inductors is connected to a single phase of three-phase power, the three phases offset from each other by one-third of a period.