Based on the fundamentals of electromagnetics, this clear and concise text explains basic and applied principles of transformer and inductor design for power electronic applications. It details both the theory and practice of inductors and transformers employed to filter currents, store electromagnetic energy, provide physical isolation between circuits, and perform stepping up and down of DC and AC voltages. The authors present a broad range of applications from modern power conversion systems. They provide rigorous design guidelines based on a robust methodology for inductor and transformer design. They offer real design examples, informed by proven and working field examples. Key features include:  * emphasis on high frequency design, including optimisation of the winding layout and treatment of non-sinusoidal waveforms * a chapter on planar magnetic with analytical models and descriptions of the processing technologies * analysis of the role of variable inductors, and