**Preface to "Emerging Power Electronics Technologies for Sustainable Energy Conversion"**

This Special Issue was edited by Dr. Francisco J. Perez-Pinal to help you explore the latest research on power electronics (PE) at sustainable energy conversion (SEC).

In broad terms, PE is an electronics'branch that links the best effective way for energy suppliers and loads, the applications of which can vary from a milliwatts to megawatts. At the beginning of the last decade, PE was believed to be a mature technology; however, in the last few years, emerging PE´<sup>s</sup> concepts and components have recently appeared, i.e., wide-bandgap semiconductors, advanced modelling methods, complex control techniques, and innovative ferromagnetic materials. As a result, PE is experiencing a transformation, and some examples are SEC, renewable energy (RE), electrified mobility (E-mobility), industry 4.0, digitalization, and digital twins. Therefore, this Special Issue summarizes in a single reference some stylish and notable solutions that deal with this PE´<sup>s</sup> revolution on SEC.

Unlike another Special Issues on PE at SEC, basic experience on converter design, modelling tools, classical control techniques, and numerical analysis on AC-DC, DC-DC, DC-AC and AC-AC is assumed. The manuscripts presented in this Special Issue cover the fundamentals and applications of silicon-carbide and gallium trioxide semiconductors, modelling methods, advanced control techniques, novel converter configurations, and up-to-date ferromagnetic materials.

It is important to mention that you do not need to read the content in sequence, as each manuscript is self-explained; and those contain a section of motivation, detailed description, numerical and experimental validation results, a comparison with other techniques reported at the state of the art and concluding remarks, this last with the main aim to enhance the development of new solutions to current and coming demands.

There is not room in this Special Issue to cover another emerging area of PE in topics such as: renewable energy (RE), electrified mobility (E-mobility), industry 4.0, digitalization, and digital twins. For more details on those hot topics, interested readers are referred to other Special Issues of MDPI´<sup>s</sup> journals and books.

I would like to take this occasion to acknowledge all the authors for submitting their work to this Special Issue. I would also like to recognize all the anonymous reviewers for contributing their efforts to providing precise and timely reviews to ensure the quality of this Special Issue. Last but not least, I would like to thank *Micromachines*'editorial staff for providing me guidance during the overall steps related to the editorial process.

> **Francisco Perez-Pinal** *Editor*
