A power conversion device includes a power conversion module, a phase change material, a heat dissipation member, a cooling mechanism, and a controller. A semiconductor switching element and a freewheeling diode configure a power conversion circuit. The phase change material is provided on a principal plane of a casing. The heat dissipation member includes a heat dissipation surface. The heat dissipation surface is overlapped with the principal plane to sandwich the phase change material. The cooling mechanism cools the heat dissipation member. The controller generates a driving signal for driving the power conversion circuit and controls the cooling mechanism. The controller includes a predetermined heating operation. The heating operation may drive the power conversion circuit, in a state that the cooling mechanism is stopped or intermittently operated, such that heat generation occurs in both the semiconductor switching element and the freewheeling diode.

Systems, methods and apparatus for wireless charging are disclosed. A wireless charging device has a plurality of planar power transmitting coils, a driver circuit and at least one substrate having channels formed therein. The channels can receive a flow of air at a port of entry and conduct the flow of air through the substrate to a port of exit. The planar power transmitting coils may be supported by at least one substrate. Each planar power transmitting coil may be formed as a spiral winding surrounding a power transfer area. The driver circuit may be configured to provide a charging current to one or more of the planar power transmitting coils when a chargeable device is placed on or near the wireless charging device. The one or more channels may be configured to conduct the flow of air past or through the planar power transmitting coils and the driver circuit.

A rack device having a cabinet and power modules stacked in the cabinet is provided. The power module has a frame, an insulative plate, an insulative cover and transformers. The insulative plate is arranged in the frame. The insulative cover is arranged in the frame and disposed spacedly from and parallel with the insulative plate. Each transformer arranged in the frame has a high-voltage set and a low-voltage set electrically connected with each other. The low-voltage sets are arranged on one surface of the insulative plate and do not protrude from the frame, and the high-voltage sets are arranged on another surface of the insulative plate and between the insulative plate and the insulative cover. The frame of each power module is connected with the frame of adjacent power module, and the frame of at least one of the power modules is connected to the cabinet.

Systems include a prime mover that generates power for a mobile vehicle; a power converter that receives a portion of the generated power, and provides configured electrical power to an aftertreatment heater device configured to selectively heat an exhaust fluid of the prime mover; at least one aftertreatment component positioned downstream of the aftertreatment heater device, and configured to treat a constituent of the exhaust fluid; and a controller including an operating conditions circuit structured to interpret an operating parameter of one of the power converter, the aftertreatment heater device, the prime mover, or the exhaust fluid; a heater management circuit that determines a heating power value in response to the operating parameter; and a heater control circuit that provides a heating command in response to the heating power value; and wherein the power converter is responsive to the heating command to heat the exhaust fluid of the prime mover.

The present disclosure provides a centralized charging cabinet, including: a charging cabinet, provided with an isolation area and a charging area therein; an isolation transformer, provided in the isolation area; and at least one charging unit, provided in the charging area, where each of the charging unit is electrically connected to a secondary winding of the isolation transformer through a plurality of first connection structures, and the plurality of first connection structures are located at a back region of the charging area. In the centralized charging cabinet, the isolation transformer is provided in the isolation area inside the charging cabinet, the charging unit is provided in the charging area inside the charging cabinet, which realizes a centralized layout of the isolation transformer and the charging unit and improves the space utilization.

According to various embodiments, a wireless charging device can comprise: a first housing, which includes a first surface facing a first direction and a second surface facing a second direction opposite to the first direction, and includes at least one hole; a second housing arranged on the second surface of the first housing in the second direction; a coil unit arranged between the first housing and the second housing and configured to transmit power to an external device; a shielding member arranged adjacent to the coil unit and including at least one hole; and a fan arranged adjacent to the coil unit and configured to rotate.

An electrical device with buoyancy-enhanced cooling is provided. The electrical device includes a housing having a first portion including a heat sink and a second portion coupled to the first portion. The heat sink includes a plurality of hollow fins. A cover plate is positioned within the housing and is coupled to the first portion of the housing. The cover plate defines openings between an interior of the housing and the plurality of hollow fins and the openings are located at each end of each hollow fin. Further, an electrical component is positioned within the interior of the housing. Air heated by the electrical component is permitted to circulate within the housing and is directed through the hollow fins based on buoyancy forces (e.g., such that the air is permitted to cool within the hollow fins based on conduction, convection, and/or radiation).

An electrical device with buoyancy-enhanced cooling is provided. The electrical device includes a housing having a first portion including a heat sink and a second portion coupled to the first portion. The heat sink includes a plurality of hollow fins. A cover plate is positioned within the housing and is coupled to the first portion of the housing. The cover plate defines openings between an interior of the housing and the plurality of hollow fins and the openings are located at each end of each hollow fin. Further, an electrical component is positioned within the interior of the housing. Air heated by the electrical component is permitted to circulate within the housing and is directed through the hollow fins based on buoyancy forces (e.g., such that the air is permitted to cool within the hollow fins based on conduction, convection, and/or radiation).

The application concerns a cooling arrangement for a power tool and a power tool comprising the cooling arrangement. According to an aspect of the invention a cooling arrangement for a power tool comprises a housing of the power tool and electronics. The electronics include at least one circuit board and at least one electronic component. The electronics comprise at least one heat conductive area. The at least one heat conductive area is arranged to be heat conductively connected to the housing of the power tool.

A power module including at least one substrate, a housing arranged on the at least one power substrate, a first terminal electrically connected to the at least one power substrate, a second terminal including a contact surface, a third terminal electrically connected to the at least one power substrate, a plurality of power devices arranged on and connected to the at least one power substrate, and the third terminal being electrically connected to at least one of the plurality of power devices. The power module further including a base plate and a plurality of pin fins arranged on the base plate and the plurality of pin fins configured to provide direct cooling for the power module.