Barbi Ivo - Soft Commutation Isolated DC-DC Converters

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Power electronics can be defined as the applied science dedicated to the electrical energy processing by the use of power semiconductors as switches. The use of static converters in the processing and control of electrical energy matured in the twentieth century to the point of becoming a vital technology of great economical relevance to society. There is a number of benefits of power electronics when compared to previous techniques including lower cost, high efficiency, high power density, and simplicity of control.

The static power converters, according to whether the input and output are alternating current (AC) or direct current (DC), are classified into four basic types: DC-DC converters, AC-DC converters, DC-AC converters, and AC-AC converters. The DC-DC converters are designed to control the power flow from a DC power source to another. They may be unidirectional or bidirectional, isolated or not. Their power ranges from a few watts to hundreds of kilowatts, while their voltage ranges from a few volts to tens of kilovolts.

DC-DC converters are used in personal computers, mobiles, electrical vehicles, lighting, railway systems, microgrids, medical equipment, avionics, and many other applications.

To optimize the power efficiency of isolated DC-DC converters, soft commutation is mandatory, particularly in high power density applications.

The aim of the authors is to present a detailed description and a quantitative analysis of the most common unidirectional soft-commutated isolated DC-DC converters, focusing on the soft commutation process, its quantitative and mathematical analysis, and the quantification of the switching parameters.

This book evolved from the authors long-term experience at two Brazilian Universities: the Federal University of Santa Catarina (UFSC) and the Federal University of TechnologyParan (UTFPR) for graduate and undergraduate electrical engineering students. Hence, this book provides valuable information for power electronics engineers, graduate and undergraduate students, as well as researchers at universities and research institutes.

During the planning and writing of this book, we have incurred indebtedness to many people, particularly our graduate students who for years, through successive generations, have helped us to improve our texts, our methods of work, and especially our way of teaching.

Ivo Barbi would like to thank and acknowledge valuable support provided by Jos Airton Beckhuser Filho, Leonardo Freire Pacheco, Guilherme Martins Leandro, and Ygor Pereira Marca.

Fabiana Pttker acknowledges the support of the Federal University of TechnologyParan, for providing sufficient time and a three-month sabbatical to work on this book.