An inductor-capacitor (LC) filter designed to comply with EMC (Electromagnetic Compatibility) standards comprises capacitors; switches for coupling capacitors; differential-mode inductors for coupling capacitors and switches; and common-mode inductors or a combination of differential-mode inductors and common-mode inductors, where an input signal changes the inductance of differential-mode inductors in the LC filter to modify a frequency response of the LC filter. In the LC filter, differential-mode inductors further comprise identical multiple-winding inductors, and the input signal, which biases the plurality of differential-mode inductors, includes a DC signal or a combination of DC and AC signals. A corner-frequency of the LC filter is adjusted and approximated as: fc=1/(2pisqrt(LC)), where fc is the corner-frequency, L is a composite value of inductance, and C is a composite value of capacitance.

A common-mode filter includes a first transmission line, a second transmission line, a first wiring layer, a second wiring layer and a third wiring layer. The first wiring layer includes a first conductive capacitor plate, in which at least partial first transmission line is in the first wiring layer, and electrically coupled with the first conductive capacitor plate. The second wiring layer includes a second conductive plate and a first inductor, and the second conductive capacitor plate is electrically coupled with the first inductor. The third wiring layer includes a third conductive capacitor plate, in which at least partial second transmission line is in the second wiring layer, and electrically coupled with the third conductive capacitor plate. The first conductive capacitor plate at least partial faces the second conductive capacitor plate, and the second conductive capacitor plate at least partial faces the third conductive capacitor plate.

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 choke for an EMI filter is provided. The EMI filter includes a first filtering circuit and a second filtering circuit. The choke includes a magnetic core assembly and four winding coils. The magnetic core assembly includes a first magnetic core and a second magnetic core. The first winding coil and the second winding coil are directly wound around the first magnetic core. The third winding coil and the fourth winding coil are directly wound around the second magnetic core. The first winding coil is serially connected with a first positive path of the first filtering circuit. The second winding coil is serially connected with a second positive path of the second filtering circuit. The third winding coil is serially connected with a first negative path of the first filtering circuit. The fourth winding coil is serially connected with a second negative path of the second filtering circuit.

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.

The present disclosure provides a common mode noise filter that can improve attenuation characteristics of common mode noise over a wide frequency range. The common mode noise filter of the present disclosure includes: two magnetic sections and each of which is made of a magnetic material; and non-magnetic section disposed between magnetic sections in a stacking direction, non-magnetic section being made of a non-magnetic material. Moreover, the common mode noise filter further includes two coils and metal layer. Coils are disposed inside non-magnetic section while facing each other. Metal layer is formed inside at least one of two magnetic sections while being connected to the ground. Metal layers are positioned closer to a lower surface of magnetic section than an upper surface of magnetic section and closer to an upper surface of magnetic section than a lower surface of magnetic section.

A common mode filter comprises a substrate, a first conductive layer, a ground layer, two conductive lines and two passive components. The substrate has a first surface, a second surface and a plurality of through holes, wherein the plurality of through holes respectively pass through the first surface and the second surface. The first conductive layer is disposed on the first surface of the substrate. The ground layer is disposed on the first surface of the substrate and spaced from the first conductive layer. The two conductive lines are disposed on the second surface of the substrate, wherein one end of each of the two conductive lines is electrically connected to the first conductive layer through one of the plurality of through holes. The two passive components are electrically connected to the ground layer and the first conductive layer.

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.

Exemplary embodiments are disclosed of circuits for integrating and/or combining electromagnetic interference (EMI) filters with power lines without using capacitors. In exemplary embodiments, a circuit comprises a common mode inductor including first and second inductors. The first inductor is configured to be operable for providing a first impedance along a live wire of the circuit. The second inductor is configured to be operable for providing a second impedance along a neutral wire of the circuit. The circuit further includes a third inductor configured to be operable for providing a third impedance along a ground wire of the circuit.

An active compensation device including a first element group including an integrated sensing/compensation unit configured to generate a sensing signal corresponding to at least one of common-mode noise and differential-mode noise on at least two high-current paths, and a second element group including a compensation control unit including a negative impedance converter and configured to generate a compensation signal corresponding to the sensing signal and provide the compensation signal to the integrated sensing/compensation unit. The compensation control unit further including a stabilization unit configured to prevent oscillation caused by the sensed noise. The first element group and the second element group are mounted on a single substrate.