**Author details**

*Wireless Power Transfer – Recent Development, Applications and New Perspectives*

There are many different types of WPT such as electromagnetic, electrostatic, electromechanical, etc. In the case of electromagnetic wireless power transfer, the systems are generally broken down into two categories of far-field and near-field

In such systems, the energy transfer is accomplished through electromagnetic radiation, which for omnidirectional propagation scenario results in poor efficiency. The range that is the far-field region of a transmitter depends on the frequency of

The idea behind WPT is simple. According to the Faraday's law of induction when a varying magnetic field passes through a loop it will produce a potential difference across it. In other words, a loop can harvest an alternating magnetic field

Generating, the required magnetic field can be done through Amperes law. Amperes law states that when an electric current flow through a loop, let us call it

*Radio Frequency (RF):* RF-based WPT is established as a technology for the transfer of power over the order of tens of meters, however, the efficiency of such

*Inductive Power Transfer (IPT):* This method utilizes the concept that an electric current driven through a coil, by virtue of the produced magnetic flux, induces an

*Magnetic Resonant Coupling (MRC):* Magnetic resonant coupling is deemed as the potential breakthrough in WPT methods [6]. The underlying concept is that two resonator circuits tuned at the same resonance frequency, can experience power transfer at higher efficiencies, at greater distances, when compared with conven-

Recent advancements in the semiconductor integrated circuits and functional materials technologies have accelerated the demand for electronic devices such as the internet of things (IoT) and wearable sensors, which have low power consump-

Wireless power transfer has become the alternative solution to current electronic

Now, if we place a second loop, let us call it the receiver loop, in the proximity of the transmitter, an alternating voltage will appear across the receiver loop. Hence

which then can be converted and stored as electrostatic energy [5].

the transmitter loop, it generates a magnetic field around it.

effectively transmitting power through electromagnetic waves.

systems is much lower than other WPT methods.

tion, miniature size, and high data transfer efficiency.

devices that rely on bulky batteries to supply the power and energy.

electromotive force in an adjacent coil.

**4. System overview**

power transfer [4].

operation.

**5. Methods**

tional IPT systems.

**6. Conclusion**

**4**

Mohamed Zellagui1,2

1 Department of Electrical Engineering, University of Batna 2, Batna, Algeria

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

\*Address all correspondence to: m.zellagui@univ-batna2.dz; m.zellagui@ieee.org

© 2021 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
