A coil device includes a core portion whose longitudinal direction is along a winding axis of a conductive wire and a core portion other than the core portion. In a core, the core portion is provided on an attachment surface of a housing 3, the core portion is stacked on the core portion, and the combined surfaces where the core portions are combined with each other are parallel to the winding axis.

A system may include at least one stationary inductive charging device for inductively charging a motor vehicle and at least one compressor. The charging device may include a base plate, a cover, an interior volume defined between the base plate and the cover, a coil, a magnetic flux guiding unit, an intermediate wall, an inlet, and an outlet. The intermediate wall may divide the interior volume into a distribution chamber and a receiving chamber. The coil and the magnetic flux guiding unit may be arranged in the receiving chamber. The inlet may be arranged on a pressure side of the compressor such that compressed gas flows into the distribution chamber via the inlet. The intermediate wall may define at least one passage fluidically connecting the distribution chamber and the receiving chamber such that gas flows into the receiving chamber via the passage with reduced pressure.

An overtemperature detecting system according to an embodiment detects a temperature abnormality of a dry-type transformer (hereinafter, referred to as a transformer) cooled by a cooling device. The overtemperature detecting system includes a temperature determining unit. The temperature determining unit determines and outputs a temperature abnormality of the transformer by changing determination conditions of the temperature abnormality of the transformer using operation states during operating and during stopping of the cooling device.

A wireless power transmitter includes a charging coil, an electronics housing, and a top side. The charging coil housing houses a charging coil and includes a top surface, wherein the charging coil wirelessly transmits power to a receiver placed on the top surface of the charging coil housing. The electronics housing houses one or more electronics and a fan. The top side is located adjacent to the electronics housing, wherein a top surface of the top side faces a bottom surface of the receiver. An intake cooling path is defined by a region between the bottom surface of the receiver and the top surface of the top side and an exhaust cooling path is located on a side of the charging coil housing opposite the intake cooling path and defined by a region between the receiver and the top surface of the top side.

An inductor which avoids heat generation and heat dissipation problems, and has a reduced resistance component, when used in a voltage converter. An inductor is configured with a pair of outer electrodes disposed on both end portions of an element assembly and electrically connected to end portions of conductors. The conductors are made of a flat-type wire having a rectangular cross section, are placed side by side between the end portions, and include cylindrical winding sections, respectively, in which the flat-type wire in a long side direction of the rectangular cross section is wound the number of turns less than one about a thickness direction intersecting with a length direction connecting the pair of end portions along the thickness direction. A heat-dissipating member includes a portion being a partition between the conductors and a portion exposed on the top of an outer surface of the element assembly.

A device for wireless transmission of electrical energy to an energy receiver, including a support surface, on which the energy receiver is arranged during energy transmission. The device includes an induction coil for transmitting electrical energy and an air duct extending within the device from an opening formed in the support surface into the device. The opening is arranged over the induction coil. The air duct is routed through a winding of the induction coil, which is preferably arranged directly under the support surface. Advantageously, the support surface is essentially rectangular, and the opening is formed on or at least close to a longitudinal axis of the support surface and is formed at a distance from an edge of the support surface. At least one projection is formed on the support surface for holding the receiving unit at a distance from the support surface so that air conducted into the air duct can better flow underneath.

A transformer includes a core group and a winding group. Each of a plurality of winding layers penetrates through a plurality of closed magnetic circuits formed by a plurality of cores. When viewed from the top, the cores are disposed with spacing along conductor wires through which current of the winding layers flows, and the winding layers are disposed side by side from the inside to the outside with spacing along a direction intersecting the direction of current. With this configuration, a coil device with good heat dissipation performance, compact size, high efficiency, and low costs can be provided.

A power transformer including at least one primary side conductive piece, at least one secondary side conductive piece, a first conductive strip pin, a second conductive strip pin and an iron core set is provided. The at least one secondary side conductive piece is stacked to the at least one primary side conductive piece along an axis. The first conductive strip pin and the second conductive strip pin extend from the at least one secondary side conductive piece, and are bent and extend along the axis. The iron core set is coupled to the at least one primary side conductive piece and the at least one secondary side conductive piece. A circuit board module is further provided.

Provided is a filter device to be connected between an AC power source (1) and a PWM converter (2), which includes a first AC reactor (3), a second AC reactor (4) that is connected between the PWM converter (2) and the first AC reactor (3), a filter capacitor (5) whose one end is connected to a connecting portion (9) between the first AC reactor (3) and the second AC reactor (4), and a housing (15) having a cooling air inlet (16) and a cooling air outlet (17) and containing the first AC reactor (3) and the second AC reactor (4), wherein the first AC reactor (3) is disposed upwind of the second AC reactor (4).

A cooling system for a high voltage electromagnetic induction device, includes: at least one duct filled with a first coolant and surrounded by a second coolant, each being routed along a direction of natural convection; at least one group of fans, each fan of the group being mounted along a respective duct of the at least one duct along the direction of natural convection and being configured to blow for the-second-coolant-forced cooling; at least one group of electric motors, each electric motor being configured to operate a respective fan of the at least one group of fans; at least one group of switches, each switch being configured to control a respective electric motor of the at least one group of electric motors. A method of cooling a high voltage electromagnetic induction device is also provided. By using the option of operating fans with higher cooling rate, because of the less fans are operating, the predetermined cooling capacity can be reached with lower power consumption.