Power Transformers are applied to convert voltages and isolate functionality and safety. The Output power range from mW to 20kW and are applied in multiple topologies including flyback, forward, push-pull, Half bridges, LLC and phase shifted full bridges etc. The working frequencies range are from 10kHz to 5MHz. The platform include surface mount, through hole and in variety of terminal, the winding method including wire-wound, flat wire, copper foil, copper plate and PCB etc. The thermal class including Class B (130C), Class F (155C) and Class H (180C), safety isolated systems for functional, basic and reinforced.