Historically, transformers have been designed and widely used to transfer energy, and for measurement, protection, electrical isolation, and signal coupling. Most transformers were designed for low-frequency operations, and despite a long history of low-frequency transformer theory and design, many stray field problems have yet to be resolved. On the other hand, there has been a significant increase in the operating frequency of many switched mode power supplies to several hundreds of kilohertz and, in some cases, even up to a few megahertz. However, in the megahertz region, several problems arise related to both the windings and the standard core materials. Therefore, the recent use for some applications of coreless transformers is ...
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