Transformer Printed Circuit Board

An 18-layer planar-transformer PCB on S1000-2M laminate, with 5.2±0.5mm overall thickness, 175um inner-layer copper and 70um outer-layer copper, plus buried vias to route primary and secondary windings without breaking magnetic loops. The heavy stacked copper acts as the conductor for high-current planar windings used in DC-DC converters, on-board chargers, telecom rectifiers, and inverters where wound-wire transformers are too tall or thermally limited. Buried vias keep flux paths clean and let the designer interleave primary and secondary turns to reduce leakage inductance. Typical end applications include energy-storage system power stages, server power-supply units, EV traction-auxiliary converters, and high-frequency industrial inverters where the planar transformer is integrated directly into the main control board for thermal and footprint efficiency.