A dry-type transformer, comprises a magnetic core, at least one high voltage (HV) winding, and at least one low voltage (LV) winding inductively coupled to the magnetic core. The transformer is made by determining a shape of an electric field that is generated, 3D printing a dielectric structure shaped to conform to the determined shape of the electric field, and mounting the dielectric structure between the HV and LV windings. A dielectric barrier arrangement for electrically isolating a coil of a transformer assembly from a further coil of the transformer assembly or from a core of the transformer assembly comprises a first dielectric structure having a first cylindrical dielectric structure extending along a longitudinal axis (L).

A shunt reactor includes a primary winding and a steel core is. The steel core includes a bottom yoke, a top yoke, a first core limb, a second core limb, and a main limb. The first core limb, the second core limb and the main limb are arranged in parallel and in between the top yoke and the bottom yoke to form a support for a magnetic flux through the steel core. The primary winding is wound around the main limb. The shunt reactor further includes an auxiliary winding wound around the bottom yoke, top yoke, first core limb, or second core limb, and is configured to generate auxiliary power. The primary and the auxiliary windings are electrically insulated from the steel core and from each other. A cooling fan is configured to be driven by the auxiliary power generated by the auxiliary winding.

An electronic device is disclosed. The electronic device discloses a plurality of wireless charging antennas, a plurality of shielding partition layers, at least some of the plurality of shielding partition layers disposed between the plurality of wireless charging antennas, a plurality of external device-receiving grooves formed through spaces defined between pairs of the shielding partition layers, and a processor electrically coupled to the plurality of wireless charging antennas. The processor is configured to: determine whether at least one external device is inserted into at least one of the plurality of external device-receiving grooves, and when the at least one external device is inserted into the at least one of the plurality of external device-receiving grooves, wirelessly transmit power through at least one wireless charging antenna corresponding to the at least one of the plurality of external device-receiving grooves into which the at least one external device is inserted.

A container type variable-frequency drive skid includes a container body, wherein a containing space is provided in the container body, a wiring unit, a voltage transformation unit and a frequency conversion unit are arranged in the containing space, a first cooling unit and a second cooling unit are further arranged in the containing space, the first cooling unit comprises an air duct and a first heat dissipation fan arranged in the air duct, the voltage transformation unit is located in the air duct, air flows through the air duct under the action of the first heat dissipation fan to cool the voltage transformation unit, the second cooling unit comprises a cold guide assembly and a second heat dissipation fan, and the cold guide assembly abuts against the frequency conversion unit. The first cooling unit cools the voltage transformation unit in an air-cooling manner, and the second cooling unit cools the frequency conversion unit in an air cooling and water-cooling combined manner, such that the situation that the voltage transformation unit and the frequency conversion unit cannot operate normally due to too high a temperature is avoided, and the operation efficiency and reliability of the whole machine are improved.

An object is to improve a core and heat radiation properties from the coil, and to reduce the size of a transformer. In order to attain the object described above, a transformer includes a bobbin wound around with a coil, a columnar core center portion in which the bobbin is mounted, and a plurality of core leg portions joining both ends of the core center portion on the outside of the coil. The size of the core leg portion is larger than the size of the other core leg portions, and the core leg portion includes a flat outer circumferential surface approximately parallel to a surface which is tangent to an outer circumferential side surface of the coil. The transformer is disposed in a housing such that the outer circumferential surface of the core leg portion is tangent to a floor surface of the housing.

An inductor (100) is provided, and includes an inductor winding (10), a housing (20), and a thermally conductive packaging material (30). The inductor winding is disposed in the housing. The thermally conductive packaging material is potted in the housing to fill a gap between the inductor winding and the housing. The thermally conductive packaging material includes a first packaging layer (31) and a second packaging layer (32), and a coefficient of thermal conductivity of the first packaging layer is greater than a coefficient of thermal conductivity of the second packaging layer. The housing includes a heat dissipation wall (21) and a packaging wall (22), and the first packaging layer is closer to the heat dissipation wall than the second packaging layer. Heat generated by the inductor can be dissipated after being transmitted to each surface of the housing through the thermally conductive packaging material.

Embodiments of this application provide a wireless charger, and relate to the field of charging device technologies. The wireless charger includes a wireless charging module, a first fan, a housing including a contact plate used for contact with the rear surface of the terminal device, and an air intake vent disposed at a position that is of the housing and that is close to the first fan, and an airflow guide structure disposed on a side that is of the housing and that is adjacent to the contact plate. The airflow guide structure extends toward the display surface of the terminal device.

The invention comprises an apparatus, comprising an inductor, the inductor comprising: an inductor core; a first winding section comprising a first cast shape and a second winding section comprising the first cast shape, the first winding section mechanically joined to the second winding section to form a winding, the winding forming a wound shape about the inductor core. Optionally and preferably, a third winding section, comprising a second cast shape, mechanically joins the first winding section to the second winding section and a mechanical connector and/or an aluminum weld join the first winding section to the third winding section.

A heat dissipation structure for the reactor includes a housing, a reactor body, and one or more heat dissipation pipes. Each of the one or more heat dissipation pipes is disposed in a cavity of the housing and is connected to the housing in a leak-tight manner, a closed cavity is formed between the one or more heat dissipation pipes and the housing, and the reactor body is disposed in the closed cavity. The above heat dissipation structure for the reactor allows to improve the heat dissipation effect of the reactor under the premise that protection requirements are met. The current carrying density of the coil of the reactor body can be increased and the diameter of copper wires can be reduced under the same conditions, thereby reducing the usage of copper and effectively reducing the cost and weight.

A power conversion apparatus includes a case having a heat-dissipation property, and including a housing part formed to surround a predetermined space, a resin material having a thermal conductivity, the resin material being provided in the predetermined space, a coil disposed in the predetermined space, a coil case having a shape that fits with the housing part, the coil case being configured to house the coil, and a power semiconductor device disposed along a side wall of the coil case. The power semiconductor device is pressed and fixed between a side wall of the housing part and the side wall of the coil case in a state where a heat dissipation surface is in contact with the side wall of the housing part.