Embodiments include a microelectronic device package structure having an inductor within a portion of a substrate, wherein the inductor is at least partially embedded within the substrate. One or more thermal vent structures extend through at least one of the substrate or a board attached to the substrate. The one or more thermal vent structures provide a thermal pathway for cooling for the inductor.

A core cooling structure includes a core and a housing. The core includes an upper core and a lower core. The core is attached to the housing. The upper core includes a heat dissipation fin that extends along a magnetic path and is disposed at an interval in a direction intersecting the magnetic path. The lower core is attached so as to be fitted into the housing.

A wireless charging device includes a shell, a coil assembly, a main board assembly and a heat dissipation assembly. The shell is defined with first and second air ports, the coil assembly and the main board assembly are located in the shell, the heat dissipation assembly is used for dissipating heat of the coil assembly and the main board assembly. The heat dissipation assembly includes a heat sink and a fan, the heat sink includes a first side and a second side facing away from each other, the coil assembly is arranged on the first side, the fan is arranged on the second side, and the fan is defined with third and fourth air ports. The first air port, the second air port, the third air port and the fourth air port are in communication with one another to form a heat-dissipation air passage located on the second side.

A transformer assembly includes an electric transformer a temperature sensor system, and a computation unit for determining a thermal state of the electric transformer. The electric transformer includes a cooling device having at least one liquid coolant channel to absorb exhaust heat from the electric transformer a heat spreader for transferring heat from the liquid coolant to a heat dissipation surface of the heat spreader, and an air blower configured to effect an airstream along the heat dissipation surface. The temperature sensor system includes an entering coolant sensor for providing an entering coolant temperature signal, a leaving coolant sensor for providing a leaving coolant temperature signal, an entering airstream sensor for providing an entering airstream temperature signal, and a leaving airstream sensor for providing a leaving airstream temperature signal. The computation unit is configured to determine a thermal state of the transformer.

Embodiments of the present invention relate to a wireless charging device. The wireless charging device includes a housing, an induction coil, a ferrite, a printed circuit board (PCB), and a fan. The housing includes a first surface and a second surface, a protrusion is disposed on the first surface, and the protrusion is configured to: support a to-be-charged device, and leave a gap between the to-be-charged device and the first surface when the to-be-charged device is installed on the wireless charging device. At least one first air guiding opening and at least one second air guiding opening are disposed on the housing. When the fan runs, the first air guiding opening, the fan, and the second air guiding opening form an air duct that passes through the ferrite and the PCB.

A magnetic stimulator includes a magnetic core, conductors, and a casing. The magnetic core includes a body portion, and leg parts that protrude in the same direction from the body portion. The conductors are wound in a coil manner respectively around the leg parts. The casing is a container for housing the magnetic core and the conductors. The leg parts of the magnetic core are formed such that cross-sectional areas thereof that are parallel to a plane which simultaneously crosses the leg parts gradually decrease from base parts on the body portion side toward tips.

A transformer assembly includes an electric transformer a temperature sensor system, and a computation unit for determining a thermal state of the electric transformer. The electric transformer includes a cooling device having at least one liquid coolant channel absorb exhaust heat from the electric transformer a heat spreader for transferring heat from the liquid coolant to a heat dissipation surface of the heat spreader, and an air blower configured to effect an airstream along the heat dissipation surface. The temperature sensor system includes an entering coolant sensor for providing an entering coolant temperature signal, a leaving coolant sensor for providing a leaving coolant temperature signal, an entering airstream sensor for providing an entering airstream temperature signal, and a leaving airstream sensor for providing a leaving airstream temperature signal. The computation unit is configured to determine a thermal state of the transformer.

A coil includes unit coils wound around a central axis and adjacent to each other with a space therebetween in a central axis direction. A reactor includes a pair of support frames and one or more spacers, the support frames facing each other in the central axis direction across the coil. The spacers are disposed between adjacent unit coils or between the support frame and the coil. At least one of the spacers is a variable spacer that includes a first member and a second member, the first member having one end face which has a recess, and the second member including a fitting portion to be fitted into the recess of the first member in the central axis direction. The linear expansion coefficient of the second member is less than the linear expansion coefficient of the first member.

A ground assembly for an inductive charging device for inductively charging a motor vehicle parked on a subsurface is disclosed. The ground assembly includes a baseplate that extends transversely to a gap direction, a coil that includes at least one coil winding spaced apart from the baseplate in the gap direction, a core assembly spaced apart in the gap direction from the baseplate and the coil, and a mounting support for holding the core assembly. The mounting support includes a support structure that is spaced apart from the baseplate in the gap direction and positions at least one core body of the core assembly.

An apparatus includes a temperature sensor configured to measure a temperature of a dry-type transformer, and the temperature sensor is arranged on or proximate a conductor of the dry-type transformer and is covered by an insulating layer of the conductor. The apparatus further includes a passive wireless communication module configured to transmit the measured temperature to a reader. The temperature of the dry-type transformer can be measured accurately, thereby improving the reliability and safety of the dry-type transformer. Accordingly, temperature measurement for the dry-type transformer can work appropriately in a cost-effective and efficient way.