Planar transformer, power module and power supply module

The invention provides a planar transformer, a power module and a power module, and the planar transformer comprises a magnetic core, the surface of which is provided with a hole; the PCB winding comprises a first winding and a second winding, the first winding is arranged around at least part of the magnetic core, part of the first winding is arranged on the surface of the magnetic core, the magnetic core and part of the first winding arranged on the surface of the magnetic core are arranged in a stacked mode, part of the first winding is located in the hole, and the second winding is arranged on the magnetic core; the first winding is one of a primary winding and a secondary winding, and the second winding is the other one of the primary winding and the secondary winding. The power density of the planar transformer can be improved. 本申请提供了一种平面变压器、功率模块及电源模块，其中，平面变压器，包括：磁芯，磁芯的表面形成有孔；PCB绕组，PCB绕组包括第一绕组和第二绕组，第一绕组围绕磁芯的至少部分设置，部分第一绕组设于磁芯的表面，磁芯与设于磁芯的表面的部分第一绕组层叠设置，部分第一绕组位于孔内，第二绕组设于磁芯上；第一绕组为原边绕组和副边绕组中的一种，第二绕组为原边绕组和副边绕组