A common mode choke coil is configured in which end portions of first and second wires are connected to first and second terminal electrodes, end portions of third and fourth wires are connected to third and fourth terminal electrodes, and at least a part of each of the first, third, fourth and second wires is wound around a winding core portion to form first, second, third and fourth layers. Also, a common mode choke coil is configured in which end portions of first and second wires are connected to first and second terminal electrodes, end portions of a third wire are connected to third and fourth terminal electrodes, and at least a part of each of the first, third, and second wires is wound around a winding core portion to form first, second, and third layers.

A filter that includes a series circuit of a first Zener diode and a second Zener diode, a third Zener diode connected between a node and ground, and a third inductor. A first series resonant circuit is formed by a parasitic capacitance of the first Zener diode, a parasitic capacitance of the third Zener diode, and the third inductor, and a second series resonant circuit is formed by a parasitic capacitance of the second Zener diode, the parasitic capacitance of the third Zener diode, and the third inductor. Moreover, the parasitic capacitances of the first Zener diode and the second Zener diode are substantially equal, and the parasitic capacitance of the third Zener diode is larger than the parasitic capacitance of each of the first Zener diode and the second Zener diode.

An on-board charger includes input ports, output ports, an AC-DC converter, an isolated DC-DC converter, a first filter, and a second filter. The first filter is connected to the input ports. The first filter includes a first common mode choke coil, a first across-the-line capacitor, and first line bypass capacitors. The second filter is connected between the isolated DC-DC converter and each of the output ports. The second filter includes a second common mode choke coil and second line bypass capacitors.

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.

A filter circuit for reducing feedback of a consumer on an energy supply is disclosed. This filter circuit includes a multipolar input, a line choke, and a multipolar output, wherein the input is configured to receive an AC voltage from the energy supply, wherein the output is configured to be connected to the consumer, wherein the line choke includes one coil for each pole of the input, and wherein the coils of the line choke are each connected between one pole of the input and one pole of the output and energy is transferred from the input to the output and/or vice versa. A resonant current suppression (RCS) group is connected in parallel to a coil of the line choke to transmit resonant currents arising at the line choke such that voltage increases generated by the resonant currents are reduced or suppressed by the at least one RCS circuit.

An active compensation circuit is disclosed. In an embodiment a circuit includes a first compensation stage and at least one other compensation stage, wherein each of the first compensation stage and the at least one other compensation stage includes a sensor configured to provide a sensor signal being representative of a current flowing in one or more phases, a controlled current sink configured to supply a compensation current as a function of the sensor signal and an active amplifier element configured to provide a frequency response of an open circuit voltage amplification and/or is to supply a maximal output current, wherein the frequency response differs from a frequency response of at least one other active amplifier and/or wherein the maximal output current differs from a maximal output current of at least one other active amplifier.

A common mode filter for reducing differential mode signal converting to common mode signal comprising: a core-cylinder, a first coil, and a second coil; wherein two ends of the core-cylinder respectively extend and set with a first flange and a second flange; wherein m.sub.1, m.sub.2, and m.sub.3 turns and n.sub.1, n.sub.2, and n.sub.3 turns are respectively and sequentially wound and set on the first winding portion, the second winding portion, and the third winding portion of the first winding area, the second winding area, and the third winding area of the first coil and the second coil. Therefore, the present invention can effectively reduce the mode conversion characteristic (Scd), and can also improve the noise reduction performance of the product; thereby greatly upgrading the practicality of the present invention; and the present invention has a simple process, therefore the product yield can be further upgraded to achieve the effect.

An on-board charger includes input ports, output ports, an AC-DC converter, an isolated DC-DC converter, a first filter, and a second filter. The first filter is connected to the input ports. The first filter includes a first common mode choke coil, a first across-the-line capacitor, and first line bypass capacitors. The second filter is connected between the isolated DC-DC converter and each of the output ports. The second filter includes a second common mode choke coil and second line bypass capacitors.

A multiple-layer circuit board has a signaling layer plane, an exterior layer plane, and a ground layer plane. A pair of differential signal lines implemented as strip-lines are within the signaling layer, and propagate electromagnetic interference (EMI) along the signaling layer. A dual slot common mode noise filter may be etched within the ground layer and may include a first U-shaped etching pair comprising a first U-shaped etching and a second U-shaped etching opposing the first U-shaped etching within the ground layer plane.

A composite electronic component includes a main body including insulating layers, first and second input terminals, first and second output terminals, a ground terminal, first and second filters, and a resistance pattern connected between the second filter and the ground terminal. The first filter includes a first coil pattern connected between the first input terminal and the first output terminal, and a second coil pattern connected between the second input terminal and the second output terminal. The first and second coil patterns form a common mode filter. The second filter includes a third coil pattern connected between the first input terminal and the ground terminal, and a fourth coil pattern connected between the second input terminal and the ground terminal. The third and fourth coil pattern form a differential mode filter. The resistance pattern is on the insulating layer different from those of the first to fourth coil patterns.