Preface

*Wireless Power Transfer – Recent Development, Applications and New Perspectives* reviews wireless power transfer (WPT) techniques with an emphasis on fundamentals, technical challenges, metamaterials, and typical applications. It describes WPT technology using magnetic resonant coupling and electric resonant coupling and presents the latest approaches to its practical implementation, operation, and applications.

Power transfer depends on coil coupling, which depends on the distance between coils, alignment, coil dimensions, coil materials, number of turns, magnetic shielding, impedance matching, frequency, and duty cycle. Receiver and transmitter coils must be aligned for best coupling and efficient power transfer.

The book discusses the difference between electromagnetic induction and magnetic resonant coupling, the characteristics of various types of resonant circuit topologies, and the unique features of magnetic resonant coupling methods. It summarizes the key technical issues of WPT systems in terms of efficiency, power, distance, misalignment, directional charging, and energy security. The book also offers a survey on the studies of metamaterial-based WPT systems. It presents the very latest in theory and technology of both coupling and radiative wireless power transfer. Lastly, the book presents some typical applications of WPT technology, including EVs, biomedical implants, and portable electronics.

By reviewing the development and the current state of WPT methods over the last several years, this book offers readers a wide view of WPT techniques based on the inductive coupling effect of the non-radiative electromagnetic field. This emerging energy transmission mechanism has significant impacts on the pervasive application of renewable energies in our daily life.

Designed to be self-contained, this richly illustrated book is a valuable resource for a broad readership, from researchers to engineers and anyone interested in cuttingedge technologies in WPT.

> **Mohamed Zellagui** Department of Electrical Engineering, University of Batna 2, Batna, Algeria

Department of Electrical Engineering, University of Quebec, Quebec, Canada

**1**

Section 1

Introduction

Section 1 Introduction

**3**

**Chapter 1**

Technologies

*Mohamed Zellagui*

**1. Introduction**

**2. History**

scientist.

**3. Motivation**

investigation in WPT.

much excitement [1–3].

obsession with wireless power is not new.

transmitting and receiving ends of the system.

consumer products based on these concepts.

lessly transmit energy from a point to another in space.

Introductory Chapter: Overview

The idea of Wireless Power Transfer (WPT) is not a new concept. From the end of the 19th Century, Nikola Tesla was already experimenting with the possibilities. In recent years, the concept of WPT has gained increased popularity and has raised

Following significant advancements in wireless data transfer over the past two decades, power is the last physical connection to be eliminated. However, the

The idea dates to 1888 in a work by Heinrich Hertz. He was able to demonstrate high frequency power transfer using a spark gap and parabolic reflectors at both the

The more famous wireless power transfer experiment was carried out later by Nikola Tesla in 1893 [1, 2]. He spent thousands of dollars and performed public demonstrations of wireless power transfer, which earned him the title of a mad

The technological breakthroughs made possible due to WPT have been fostering an increased research activity, as well as the commercialization of numerous

From a research and development perspective, there are two principal fields of

The first approach comprises the underlying mechanisms of power transfer, particularly by seeking knowledge about the possible scientific methods to wire-

The second approach includes the development of individual circuit modules required in a functional wireless power transmission system. This includes circuit design considering the specifics of a particular WPT mechanism, ensuring that the module has the appropriate characteristics for that power delivery mechanism.

of Wireless Power Transfer
