A noise filter includes a metallic bottom plate, a case main body integrally formed with a terminal strip and attached to the bottom plate, and a capacitor including a terminal configured to be connected in the terminal strip. The noise filter further includes a capacitor housing part formed inside the terminal strip in the case main body, the capacitor housing part being configured to house the capacitor, and an inductor disposed on a top surface side of the case main body, the inductor comprising a terminal configured to be connected in the terminal strip. The capacitor housing part houses the capacitor, in a state where the capacitor is inclined with respect to the bottom plate, so that a lead part of the terminal of the capacitor is positioned on an upper end side of the capacitor in an inclination direction.

A Communication System includes a first power supply channel including a first impedance and a second impedance, and configured to transfer electrical power from a first power source to a first load. The first power supply channel is configured to electrically couple to the first power source via a first common mode choke. The communication system also includes a second power supply channel comprising a third impedance and a fourth impedance, and configured to transfer electrical power from a second power source to a second load. The second power supply channel is configured to electrically couple to the second power source via a second common mode choke. The communication system further includes a first transceiver comprising a first output pin electrically coupled to the first power supply channel and a second output pin electrically coupled to the second power supply channel at a first end of the communication system.

An electronic component includes an element body, an external electrode, and a resin film having electrical insulation properties. The element body includes a principal surface and a side surface adjacent to the principal surface. The external electrode includes a first electrode portion disposed on the principal surface and a second electrode portion disposed on the side surface. The resin film is disposed on the principal surface and is in contact with the principal surface. Each of the first electrode portion and the second electrode portion includes a conductive resin layer disposed on the element body. A conductive resin layer included in the first electrode portion is disposed on the resin film and is in contact with the resin film.

Radio frequency filtering circuitry blocks certain frequencies in an outgoing signal so that the signal may be transmitted over a desired frequency. The radio frequency filtering circuitry includes a first inductor having a first coil and a second inductor coupled to and disposed within the first coil. The second inductor has a second coil and a third coil symmetrical to the second coil. When current is applied to the radio frequency filtering circuitry, the current in the second coil causes a first induced current in the first coil and the current in the third coil causes a second induced current in the first coil, wherein the second induced current is approximately equal in magnitude and opposite in direction to the first induced current. As such, the second induced current may compensate for the first induced current.

This application relates to an independent active electromagnetic interference filter module. In one aspect, the filter module includes a first element group including a noise sensing unit provided to sense electromagnetic noise, and a second element group including a compensating unit provided to generate a compensation signal for the electromagnetic noise. The first group and the second group may be respectively mounted on different substrates. According to some embodiments, the filter module can reduce a volume of each element constituting an electromagnetic interference filter module, implement a single modularization of a compact structure. The filter module can also improve electromagnetic interference noise reduction performance and a manufacturing method thereof.

A differential mode electromagnetic noise injection network includes an injection piece and a differential mode loop. The injection piece includes a semiconductor transistor or a winding differential mode inductor. The injection piece is at least provided with a first injection end, a second injection end, and a differential mode electromagnetic noise component input end. The differential mode electromagnetic noise component input end is configured to input a differential mode electromagnetic noise component. The first injection end and the second injection end are connected to any two points that are connected in series in the differential mode loop in a one-to-one correspondence, and are configured to inject the differential mode electromagnetic noise component. An active electromagnetic interference filter including the differential mode electromagnetic noise injection network mentioned above is provided.

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.

A noise filter includes: a first bus bar that is electrical wiring of a flat plate, the first bus bar including a first extending wiring portion extending in a first direction, a second extending wiring portion extending in a second direction that is a direction opposite to the first direction, and a first coupling wiring portion connecting the first extending wiring portion and the second extending wiring portion; a first lead conductor having a first end connected with the first coupling wiring portion; a first capacitor having a first end connected with a second end of the first lead conductor and a second end connected with a ground; and a magnetic core having an opening in a central portion, the magnetic core disposed in such a manner that the first coupling wiring portion passes through the opening.

A single stage electromagnetic interference (EMI) filter circuit includes a power source input configured to connect to a power source; an equivalent common mode and differential mode filter including a single inductor having both common mode inductance for common mode filtering and specific parasitic inductance; and a differential capacitance stage connected to the single inductor in parallel, wherein a combination of the specific parasitic inductance and capacitance of the differential capacitance stage are used to provide differential mode filtering.

An inductive filtering device includes a plurality of grouped electrical conductors and at least two toric magnetic cores, each formed around a central void, the two magnetic cores having different magnetic lengths, the electrical conductor being wound together around both magnetic cores by passing through the central voids of both magnetic cores.