Design Challenges for High Frequency Magnetic Circuit Design for Power Conversion

The key to reducing the size of power supplies is high frequency operation and magnetic components can play a critical role. The seminar begins with the design rules for inductor design and examples of different types of... [ view full abstract ]

The key to reducing the size of power supplies is high frequency operation and magnetic components can play a critical role. The seminar begins with the design rules for inductor design and examples of different types of inductors are given. A special example is the inductor in a flyback converter, since it has more than one coil. This is followed by the general design methodology for transformers and many examples from switched mode power supplies and resonant converters are given. The main focus is placed on modern circuits where non-sinusoidal waveforms are encountered. General rules are established for optimising the design of windings under various excitation and operating conditions. The skin effect and the proximity effect give rise to increased losses in conductors due to the non-uniform distribution of current in the conductors. A new approach to high frequency losses that avoids cumbersome Fourier analysis will be presented to optimise the winding design, for non-sinusoidal waveform encountered in power electronics. Core losses for both sinusoidal and non-sinusoidal flux will be covered. This seminar is of interest to graduate students and practising engineers working with power supplies and energy conversion systems.