An advantageous effect of a low-pass filter that reduces high-frequency noise can be obtained by including an input terminal that extends from a front surface to a rear surface of a multilayer circuit board including a double-sided circuit board; a first wiring conductor having an end connected to the input terminal on the rear surface of the multilayer circuit board; a first via that extends from an other end of the first wiring conductor to the front surface of the multilayer circuit board; a second wiring conductor having an end connected to the first via on the front surface of the multilayer circuit board; and a first input capacitor disposed on the second wiring conductor; by being conductive due to the input terminal and the first via being configured in series; and including the first input capacitor.

A board-type noise filter having higher noise removal performance than that of a conventional noise filter, and an electronic device including the board-type noise filter are provided. The board-type noise filter includes: a printed wiring board having a wiring pattern formed thereon; a choke coil including a core having a toroidal shape; a frame ground portion fixed to the printed wiring board at a position overlapping with a hollow portion of the choke coil when the toroidal shape of the choke coil is seen in plan view, the frame ground portion being capable of being grounded to a frame ground; and a capacitor having a first terminal connected to the frame ground portion through the wiring pattern.

Systems, methods, and computer-readable media are disclosed for common mode filters with inverted inductive ground structures. In one embodiment, an example printed circuit board may have a first layer with a pair of differential transmission lines, and a common mode filter embedded in the printed circuit board. The common mode filter may include a signal reference structure and an inductive ground structure. The signal reference structure may include a first rectangular portion, and a second rectangular portion having the same dimensions. The second rectangular portion may be separated from the first rectangular portion by a distance. The inductive ground structure may include a first cell having a first conductive line coupled to a first side of the first rectangular portion and a first edge of the common mode filter, and a second cell having a second conductive line coupled to a first side of the second rectangular portion and the first edge.

A circuit arrangement for an onboard network of a motor vehicle, includes a line having a first inductivity and connecting a component of a power electronics of an onboard network with an element, wherein the component is adapted for being clocked during operation of the power electronics at a clock frequency; and an absorber circuit assigned to the line and having a second inductivity and a capacitance, wherein the second inductivity of the absorber circuit is coupled with the first inductivity of the line.

A power supply system suitable for use by an aircraft is disclosed. The power system converts power from an unregulated DC power source to multiple AC and DC voltage outputs. The power supply system comprises an interleaved buck converter, and interleaved full-bridge converter, an interleaved inverter, and a control system. In one configuration, the interleaved inverter uses high-voltage DC generated by the interleaved four-bridge converter as its power input to generate a high-voltage AC output.

A PoDL system conducts differential data and DC power over the same wire pair, and various DC coupling techniques are described that improve DC voltage coupling while attenuating AC common mode noise. Pairs of differential mode chokes (DMCs) are used to share current supplied by a power supply. In one embodiment, one DMC is coupled to the line side of a common mode choke (CMC), and one DMC is coupled to the PHY side of the CMC. The line-side DMC has windings that are loosely magnetically coupled so that DMC does not present a very low impedance to AC common mode noise on the wires. Therefore, the performance of the wires' RC termination circuitry is not adversely affected by the line-side DMC when minimizing reflections of common mode signals. The DMCs may use the same magnetic core, and the CMC may be series CMCs that used the same magnetic core.

A positive electrode side input loop line (10a) and a positive electrode side output loop line (10b), and a negative electrode side input loop line (11a) and a negative electrode side output loop line (11b) form two sets of coupling loops, and the loop lines of the two sets have the same winding direction, and have the same loop sizes of and relative relationship between the loop lines. A capacitor (3) is connected in series between the positive electrode side input loop line (10a) and the negative electrode side input loop line (11a).

In a Power over Data Lines (PoDL) system that conducts differential data and DC power over the same wire pair, various DC coupling techniques are described that improve DC voltage coupling while attenuating AC common mode noise. Pairs of differential mode chokes (DMCs) are used to share current supplied by a single phase or multi-phase power supply. In one embodiment, one DMC is coupled to the line side of a common mode choke (CMC), and one DMC is coupled to the PHY side of the CMC. The line-side DMC has windings that are loosely magnetically coupled so that DMC does not present a very low impedance to AC common mode noise on the wires. Therefore, the performance of the wires' RC termination circuitry is not adversely affected by the line-side DMC when minimizing reflections of common mode signals.

An in-phase noise suppression device includes a signal transmitting unit and a grounding unit. The signal transmitting unit includes a number (N) of signal transmitting circuits, where N?3. Each of the signal transmitting circuits has an input terminal and an output terminal, receives a level signal at the input terminal thereof, and outputs the level signal at the output terminal thereof. The grounding unit includes a grounding circuit that is connected to the signal transmitting unit. The level signals respectively received by the signal transmitting circuits at the input terminals thereof, when being respectively transmitted along the signal transmitting circuits, generate at least two balanced digital signals and in-phase noise. The signal transmitting unit and the grounding circuit cooperatively constitute a noise suppression device so as to suppress the in-phase noise generated in the signal transmitting circuits.

A common mode noise filter includes a laminated body including first to fourth insulating layers stacked on one another, first to fourth coil conductors spirally extending and disposed on upper surfaces of the first to fourth insulating layers, respectively, a first via-electrode connecting the first coil conductor to the second coil conductor, a second via-electrode connecting the third coil conductor to the fourth coil conductor, first and second connection parts connecting the first via-electrode to first and second inner ends of the first and second coil conductors, respectively, and third and fourth connection parts connecting the second via-electrode to third and fourth inner ends of the third and fourth coil conductors, respectively. The first connection part overlaps the second connection part when viewed from above. The third connection part overlaps the fourth connection part when viewed from above. The common mode noise filter is operable in high frequencies.