The invention relates to an electrical filter element (1) for filtering alternating voltage interference. The electrical filter element (1) comprises two dielectric circuit board substrates (11, 12) having a magnetic core (13) arranged between the circuit board substrates. The magnetic core (13) has a material-free inner region (13a), in which electrical connection elements (21-24) are provided between the two dielectric circuit board substrates (11, 12). Furthermore, electrical connection elements (31, 32) can also be provided between the two dielectric circuit board substrates (11, 12) in an outer region of the magnetic core (13).

An inverter apparatus includes a main circuit substrate, an EMC filter substrate, a control substrate, and a panel. The main circuit substrate is configured to convert electric power and includes an output terminal through which the electric power is output from the inverter apparatus. The EMC filter substrate is provided on the main circuit substrate and configured to reduce propagation of electromagnetic noise. The EMC filter substrate includes a first input terminal through which the electric power is input to the inverter apparatus. The control substrate is provided on the EMC filter substrate so that the EMC filter substrate is sandwiched between the main circuit substrate and the control substrate. The control substrate is configured to control the main circuit substrate. The panel is provided on the control substrate so that the control substrate is sandwiched between the EMC filter substrate and the panel.

A power supply module having at least one inductor modules, a top PCB mounted on top of the at least one inductor modules, and at least one pair of power device chips mounted on top of the top PCB, wherein power pins and signal pins for connecting the top PCB and a board that the at least one inductor modules are attached to, are implemented by metal layers wrapping each of the at least one inductor modules.

A communication device includes a communication connector, a communication control circuit, and a common mode filter. The communication control circuit controls communication that is established by way of the communication connector. The common mode filter is connected to each of the communication control circuit and the communication connector to relay the communication. Letting a wavelength corresponding to a clock frequency of an electric signal sent out from the communication control circuit be denoted as λ, an electrical length of a signal path at which resonance is produced by a reflected wave resulting from reflection of the electric signal by the common mode filter is closer to an even multiple of λ/2 than to an odd multiple thereof.

A receiver or transmitter designed for a broad range of frequencies requires a pre-select filter for incoming signals or a post-select filter for outgoing signals to minimize spurious signal responses. In conventional receivers, several discrete RF filters are used and a switched filter bank is created utilizing a large amount of space. A filter bank comprising a plurality of stacked shielded filters would enable different filter technologies and topologies to be used together, as other passive and active circuits may be combined into the one surface mountable component in order to save on PCB space.

In some embodiments, a method includes receiving, at a circuit board, a power from a power supply. The method further includes filtering, at the circuit board and via a power filter having at least three choke filters, the power to produce a filtered power. The method further includes dividing, at a first portion of a circuit on the circuit board, a power associated with the filtered power into a first power and a second power, a characteristic of the first power differing from a characteristic of the second power by a factor of at least 1.5 or at most one half.

Electrical circuit arrangement for an energy storage system comprising a first electrochemical energy storage device and a second electrochemical energy storage device.

An apparatus and method for a shielding structure for surface-mount LTCC components and filters to increase the signal isolation from input signal port to output signal port. An LTCC filter device with an increased rejection of undesired frequencies in a stopband and minimal distortion or loss of desired signals in a passband.

In some aspects, a flexible cable may comprise: a flexible strip with first and second parallel surfaces and first and second ends, said flexible strip being electrically insulating; a metal stripline within said flexible strip; first and second metallic grounding planes on said first and second surfaces, respectively; and a first circuit board mechanically attached to at least one of said first end of said flexible strip and said first and second metallic grounding planes at said first end, said first circuit board being mechanically stiff, said metal stripline being electrically connected to electrical circuitry on said first circuit board.

The device may include a core. The device may include built-up layers arranged over the core. The device may also include a ground path disposed in a first built-up layer of the built-up layers. The device may also include a power path disposed in a second built-up layer of the built-up layers. The device may also include a multi-terminal capacitor on a top layer of the built-up layers. The multi-terminal capacitor may be coupled to the ground path and the power path through respective vias passing through the built-up layers. The respective vias may be arranged to alternate such that respective vias coupled to the power path neighbor a respective via coupled to the ground path.