Planar Transformers can be an attractive alternative to conventional wire wound transformers. They can be constructed as stand alone transformers with a stacked design of copper track layer sheets and insulation foils or with a small multilayer PCB. Another possibility is to integrate the windings into a multilayer PCB board of the power supply. Important benefits of planar transformers are: -Low profile -Excellent thermal characteristics; supported by low thermal resistance and easy use of heat sinks -Low leakage inductance -Excellent repeatability of (parasitic) properties Especially for high power and high current applications the stand alone stacked layer design appears to be very useful, because of its flexibility in the design of copper tracks, making them suitable to carry high currents. This will generally result in higher throughput power densities, and lower volume designs compared to wire wound solutions. The focus from ISE for planar transformers is on the higher power levels of ca. 5 till 30 kW. Basic core shapes configurations which are used for this range consists of planar ferrite cores E64 and E 102, but this can be easily extended to the use of other core shapes. For this higher power range ISE can deliver solutions which will show for the users clearly a benefit in performance, volume and costs.