The present invention relates to a coil-based electromagnetic wave resonance transfer device for improving energy efficiency, which comprises: a housing; an electronic circuit board which is installed in the housing and senses an external signal generated outside the housing, to generate an electric wave signal having a specific waveform, of which a frequency is adjusted by using a multi-frequency modulation method; and a coil member which is installed in the housing and generates a resonant magnetic field through the electric wave signal output from the electronic circuit board to output an electromagnetic resonance wave to the outside of the housing.

An integrated common mode and differential mode inductor can include a first core including a first center leg, a second core including a second center leg, a first center winding on the first center leg, and a second center winding on the second center leg. The first center leg can be spaced apart from the second center leg, for example by a center air gap. The integrated common mode and differential mode inductor can further include a left winding on a first left leg of the first core and a second left leg of the second core, as well as a right winding on a first right leg of the first core and a second right leg of the second core.

A transformer apparatus reducing magnetic field interference includes an iron core, a first side coil unit, a second side coil unit, a first current transmission line, a second current transmission line and a third current transmission line. Both the first side coil unit and the second side coil unit are wound around the iron core. The first side coil unit is connected to the first current transmission line and the second current transmission line. The second current transmission line is connected to the third current transmission line. The first current transmission line includes a first current conduction segment and a first insulation layer. The first insulation layer coats the first current conduction segment. The third current transmission line includes a second current conduction segment and a second insulation layer. The second insulation layer coats the second current conduction segment. The second insulation layer touches the first insulation layer.

A choke comprising a magnetic core having a centre line that forms a closed loop, the choke has a choke axis around which the magnetic core is located, and a coil wound around the magnetic core, the coil has a plurality of turns, each of the turns has a width perpendicular to lengthwise direction of the turn, and a thickness perpendicular to both lengthwise direction of the turn and the width. The coil has a cross-section whose shape varies along lengthwise direction of the coil, such that each turn has an inner portion and an outer portion whose width is substantially greater than width of the inner portion, the outer portion is located further from the choke axis than the inner portion.

A DC filter device includes: a first filter device connection; a second filter device connection; a third filter device connection; a fourth filter device connection; a coil core; at least one first coil arranged on the coil core, the at least one first coil being connected in between the first filter device connection and the third filter device connection; at least one second coil arranged on the coil core, the at least one second coil being connected in between the second filter device connection and the fourth filter device connection; and a third coil arranged on the coil core, the third coil having a first coil connection and a second coil connection. The first coil connection and the second coil connection are connected to one another via a circuit device, which circuit device has a resistor.

A coupled inductor for low electromagnetic interference includes a plurality of windings and a composite magnetic core including a coupling magnetic structure formed of a first magnetic material and a leakage magnetic structure formed of a second magnetic material having a distributed gap. The coupling magnetic structure magnetically couples together the plurality of windings, and the leakage magnetic structure provides leakage magnetic flux paths for the plurality of windings.

The disclosure provides a magnetic assembly and a power supply apparatus. The magnetic assembly of the present disclosure includes: a first magnetic core, a plurality of windings, a housing and a second magnetic core, where the first magnetic core has a winding area, and the plurality of windings are wound with an interval on the winding area of the first magnetic core; the housing has an accommodating cavity, and at least part of the plurality of windings is accommodated in the accommodating cavity, and the second magnetic core is arranged between a cavity wall of the accommodating cavity and the plurality of windings. According to the present disclosure, parasitic parameters such as leakage inductance of the magnetic assembly are relatively stable, and the power supply efficiency is improved and higher.

A system is provided for transferring power between a stator and a rotor of an excitation system. The stator and the rotor may form part of a rotary transformer that includes a primary winding and a secondary winding, where power is transferred from the primary winding to the secondary winding or conversely from the secondary winding to the primary winding.

A test and measurement instrument for determining magnetic core losses of a device under test during in circuit operation. The test and measurement instrument receives a primary current signal from a primary winding of a device under test and receives a primary voltage signal measured across a magnetic core of the device under test. Based on the primary electric current signal and the primary voltage signal, the test and measurement instrument determines a magnetic loss of the device under test. In some examples, the test and measurement instrument can use primary and secondary voltage and current inputs to determine the magnetic loss of the device under test. The magnetic loss of the device under test can be displayed on a display of the test and measurement instrument. The magnetic loss can include a total magnetic loss, a hysteresis loss, a copper loss, and/or other losses.

Various embodiments include an inductor assembly for a converter comprising: a plurality of first conductors arranged on respective legs of a first magnetic core; a second magnetic core with one or more legs, the second core magnetically coupled to the first core via an air-gap and arranged to provide a path for common mode magnetic flux of the plurality of first conductors; and a respective second conductor corresponding to each of the plurality of first conductors. Each pair of first and second conductors is electrically connected in series. The second conductors are arranged on a single leg of the second core and positively coupled to each other.