Abstract: The present disclosure provides a wireless power transfer system and a wireless power transfer assembly. In one aspect, a wireless power transfer assembly includes a flexible printed circuit board, which is also referred to as a flexible printed circuit board structure. The flexible printed circuit board includes a litz winding. The litz winding has multiple layers of electrically insulated strands. The wireless power transfer assembly also includes a ceramic heat sink. The ceramic heat sink is arranged relative to the flexible printed circuit board in a manner that dissipates heat away from the litz winding. In another aspect, a wireless power transfer system includes a transmit unit or receive unit having an input stage, a resonator, and the wireless power transfer assembly.

Abstract: A hybrid circuit breaker and a pre-charge control method are provided. The hybrid circuit breaker includes an outer branch, a first branch, a first mechanical switch module, a second branch, an electronic switch and a current commutation circuit. The first branch is connected with the outer branch in series. The first mechanical switch module is located on the first branch. The second branch is connected with the first branch in parallel. The electronic switch is located on the second branch. The current commutation circuit includes a voltage source module and an inductor. The voltage source module is located on the second branch. The inductor is located on one of the first branch or the second branch.

Abstract: A reliable, potting free, and partial discharge free PCB-based inductor is provided. In one aspect, the PCB-based inductor includes an insulating planar board having a central through hole and conductive layers embedded in the insulating planar board. Each of the conductive layers is patterned to have a spiral shape around the central through hole and arranged in an annulus region having an annular radius. The conductive layers are arranged in a staggered pattern, such that the annular radius of the conductive layers increases from the centermost one of the conductive layers to the outermost ones of the conductive layers.

Abstract: The present disclosure provides a power transformer for medium voltage semiconductor devices. In one aspect, the power transformer includes a primary winding and a secondary winding, a primary magnetic core wound by the primary winding, a secondary magnetic core wound by the secondary winding, and a coupling coil wound about the primary and secondary magnetic cores.