DESIGN OF HIGH FREQUENCY POWER TRANSFORMER FOR SWITCHED MODE POWER SUPPLIES

Application of high frequency power transformers has become abundant in most of the power electronic switched mode power supplies. As the contextual idea behind the evolution of power electronic switched mode powers supplies against the general linear grid power supplies is, to convert and control the electrical power in accordance to the load requirements in an efficient way using power transformers, inductors, capacitors, and electronic switches which ideally do not dissipate any power. This paper will noticeably convey the step by step design strategy of high frequency power transformer distinguishing, how it is variant from normal fundamental frequency distribution & power transformers, its mathematical electrical circuit modeling, magnetic circuit modeling, mathematical relationship between various electrical and magnetic quantities to the geometry of the magnetics, some customer and designer specifications while processing the practical design, A practical design example to how one has to design high frequency transformer right from the core selection with the idea of mathematical power capacity derivations and data sheets considerations, number of turns calculation, wire gauge calculation considering the skin effect as it is high frequency operation, core loss calculations, calculation of some non-idealities that comes to picture like winding magnetizing inductances, energy stored in the transformer due to non-idealities, peak primary magnetizing current calculations and so on. Some of the practical design tips & safety tips are also included in path way of the design processing.