A subsea AC power supply device comprises a subsea transformer, having a primary winding arranged to be connected to a topside AC power supply via a subsea power supply cable, and a subsea shunt reactor, connected in parallel with the primary winding of the subsea transformer. The subsea transformer and the subsea shunt reactor are arranged within a common subsea watertight housing. A subsea AC power supply system comprises a topside AC power supply, a subsea power supply cable connected to the topside AC power supply, and a subsea AC power supply device connected to the subsea power supply cable.

A subsea AC power supply device comprises a subsea transformer, having a primary winding arranged to be connected to a topside AC power supply via a subsea power supply cable, and a subsea shunt reactor, connected in parallel with the primary winding of the subsea transformer. The subsea transformer and the subsea shunt reactor are arranged within a common subsea watertight housing. A subsea AC power supply system comprises a topside AC power supply, a subsea power supply cable connected to the topside AC power supply, and a subsea AC power supply device connected to the subsea power supply cable.

A transformer includes a housing having a base wall, a first side wall, a second side opposing wall, a third side wall joining the first side wall and the second side wall at a first end including a first cooling channel joining the first side wall and the second side wall at a first end, and a fourth side wall including joining the first side wall and the second side wall at a second end. The first, second, third, and fourth side walls collectively define an interior portion. A cover extends across each of the first side wall the second side wall, the third side wall, and the fourth side wall. A cooling system includes a first cooling channel disposed in the third side wall, a second cooling channel disposed in the fourth side wall, and a third cooling channel disposed in the cover.

An inductor assembly includes a housing including a base, a sidewall, and an insert. The base and the sidewall define a cavity and the insert being positioned within the cavity. A core assembly is positioned within the cavity. The core assembly includes a core and a plurality of windings wrapped about the core and disposed between the sidewall and the insert. A flow path is formed in the housing for receiving a coolant to remove heat from the core assembly.

An inductor assembly includes a housing including a base, a sidewall, and an insert. The base and the sidewall define a cavity and the insert being positioned within the cavity. A core assembly is positioned within the cavity. The core assembly includes a core and a plurality of windings wrapped about the core and disposed between the sidewall and the insert. A flow path is formed in the housing for receiving a coolant to remove heat from the core assembly.

A wireless charging coil structure with a function of heat dissipation comprises a first connecting terminal, a second connecting terminal and a coil. The coil is disposed between the first connecting terminal and the second connecting terminal, and configured to transmit a signal between the first connecting terminal and the second connecting terminal. The coil comprises a heat-pipe segment and a transmission segment electrically and heat-conductively connected with each other. The transmission segment has a predetermined thickness, the heat-pipe segment encircles an accommodating space, and a heat-dissipating medium is disposed in the accommodating space.

A wireless charging coil structure with a function of heat dissipation comprises a first connecting terminal, a second connecting terminal and a coil. The coil is disposed between the first connecting terminal and the second connecting terminal, and configured to transmit a signal between the first connecting terminal and the second connecting terminal. The coil comprises a heat-pipe segment and a transmission segment electrically and heat-conductively connected with each other. The transmission segment has a predetermined thickness, the heat-pipe segment encircles an accommodating space, and a heat-dissipating medium is disposed in the accommodating space.

A power conversion device such that heat dissipation of an electromagnetic induction instrument can be increased, and inductance value durability and vibration resistance of the electromagnetic induction instrument is high, is provided. Also, a power conversion device reduced in size and weight is provided. A power conversion device includes an electromagnetic induction instrument wherein an upper core and a lower core having magnetism are electromagnetically coupled across a coil body, a frame body on which the electromagnetic induction instrument is mounted, a potting resin member with which a space between the frame body and the electromagnetic induction instrument is filled, and a fixing member, disposed above the electromagnetic induction instrument so as to cover the upper core, of which an end portion is attached to the frame body, wherein the electromagnetic induction instrument is fixed to the frame body by the fixing member.

A choke structure with water cooling includes a water-cooled device, a choke assembly mounted on the water-cooled device, a ceramic heat spreader with high thermal conductivity set between the choke assembly and the water-cooled device, a metal housing having upper and lower openings installed on the water-cooled device to surround the choke assembly and the ceramic heat spreader with high thermal conductivity, and a printed circuit board is arranged on the upper opening of the metal housing, wherein the generated heat while operating the choke assembly is transmitted through a first heat conduction path formed by the ceramic heat spreader with high thermal conductivity in contact with the choke assembly and the water-cooled device for dissipating heat.

In a transformer, forward and reverse secondary coils are connected to a single reference electrode or any of a plurality of reference electrodes. The forward secondary coil includes first and second winding portions wound around a forward iron core. The reverse secondary coil includes third and fourth winding portions wound around a reverse iron core. A first primary coil is formed around the first and third winding portions. The second primary coil is formed around the second and fourth winding portions. The single reference electrode or each of the plurality of reference electrodes is in the form of a plate.