What every designer should know about magnetics in switch-mode power supplies

摘要

The application of electromagnetics has been in practice for more than a century: In 1831, Englishrnchemist and physicist Michael Faraday invented the transformer, although he called it an induction coil. Unfortunately, engineering schools rarely provide instruction in practical magnetics relevant to SMPS (switch-mode-power-supply) applications. Part of the problem is that the classic design equations for magnetics target sinusoidal waveforms, but SMPSs operate with rectangular waveforms.