This book presents a treatise of the current injection methods applied inthree-phase diode bridge rectifiers to reduce the harmonic content of theinput currents. The material presented in the book is a result of a decade ofresearch in the area. Some of the results were published in a shorter form ina number of journals, and previously presented at several conferences.However, the book is not a collection of papers. Writing a book was anopportunity to present the results in a more readable form, with all of thenecessary derivations and explanations. In addition, some of the resultspresented in the book were written several years after the research was doneand the initial results were obtained, which provided some time to judgethem and to make corrections. The book also contains some new results,never previously published, primarily in Chapter 13 that treats currentinjection versions of 12-pulse rectifiers, but new material can be found inother chapters of the book as well. A special chapter that deals with currentinjection devices is included in the book, and this important topic waspreviously only casually mentioned in the research papers. All of the resultsare presented in a uniform style that should provide an easier comparison ofthe methods. This book should be helpful for researchers in the area, as wellas for the practicing engineers who are interested in applying the currentinjection methods.The complex math that underlines current injection methods resultsin simple rectifiers, which consist of a moderate number of elements.Reduction of the input current harmonics is always obtained at a cost. Thus,unless there are regulations that limit the input current harmonics, devicesthat apply this reduction are infrequent. Current injection based rectifiersqualify as an attractive choice to meet the regulations and/or to resolve thetopologies proposed and analyzed in this book meet the harmonic regulationsand are readily waiting for the regulations to arrive.The current injection methods have an oscillating history. To the best ofmy knowledge, the first ideas regarding current injection date back to 1954.Just after their invention, the methods had been forgotten until the late 1960sand the beginning of the 1970s. The next outburst of research resultsoccurred in the mid-1980s, followed by several years of reduced activity.Finally, starting from the 1990s, the current injection methods have beencontinuously a topic of interest to researchers.I wish to express my sincere thanks to many people who contributed tothis book. The first is a colleague who initiated my research in the area. Nextare many colleagues who contributed to my research through inspiringdiscussions. Then, there are students who asked many relevant questions andforced me to provide better explanations and to improve my arguments.Many thanks are due to a colleague who suggested I publish this book.Finally, the editorial staff significantly improved this book and deservessincere appreciation for their efforts. An attempt to name all of these peoplewould inevitably result in an incomplete list and would be unfair to thoseexcluded. However, without all of these people, this book would not appearin its present form. I would also like to thank the IEEE and the IET forgranting the copyright permissions.