ABSTRACT
This chapter describes aspects related to the characterization of coreless printed circuit board (PCB) transformers and behavior of the transformer under different load conditions and operating frequency. The coreless PCB transformer consists of three parts: the primary winding, the dielectric laminate, and the secondary winding. The PCB transformer can be built on the same circuit board with other electronics. Coreless PCB transformers can achieve high power density, and they are suitable for applications in which height requirements are stringent. High voltage gain can be achieved with coreless PCB transformers by connecting an external capacitor across the secondary windings, the resonant effect of the inductive components of the transformer, and the external capacitor can provide high voltage gain. Electrical parameters of coreless PCB transformers and mainly the inductances depend on the geometry of the coreless transformer. For coreless PCB transformer with primary and secondary windings printed directly on the opposite sides of a double-sided PCB, the intra-winding capacitance is negligible.
