| 摘要 |
Embodiments provide a multi- layered printed circuit board, PCB, for providing first windings for a first side of a planar magnetic transformer and second windings for a second side of the planar magnetic transformer, the PCB comprising; a plurality of conductive layers configured to provide the first windings,- a plurality of conductive layers configured' to provide the second windings; and a plurality of layers of an isolation material; wherein, each layer of isolation material is arranged between two conductive layers so as to provide electrical isolation between said two conductive layers; and a group of two or more adjacent conductive layers are all conductive layers of the first windings and are all arranged between two conductive layers of the second windings, wherein the thickness of the isolation material between the group of adjacent conductive layers of the first windings is less than ^ the thickness of the isolation material between a conductive layer of the second windings and a conductive layer of the first windings. Advantageously, a PCB with a lower height than realisable with known fully interleaved planar magnetic transformer designs is provided. The reduced height improves the thermal conductivity of the PCB, the flux leakage is reduced and good magnetic coupling between the primary and secondary sides is maintained. |
