Inductive Power Transfer for Electric Vehicle Charging Applications: A Comprehensive Review

Abstract

Nowadays, Wireless Power Transfer (WPT) technology is receiving more attention in the automotive sector, introducing a safe, flexible and promising alternative to the standard battery chargers. Considering these advantages, charging electric vehicle (EV) batteries using the WPT method can be an important alternative to plug-in charging systems. This paper focuses on the Inductive Power Transfer (IPT) method, which is based on the magnetic coupling of coils exchanging power from a stationary primary unit to a secondary system onboard the EV. A comprehensive review has been performed on the history of the evolution, working principles and phenomena, design considerations, control methods and health issues of IPT systems, especially those based on EV charging. In particular, the coil design, operating frequency selection, efficiency values and the preferred compensation topologies in the literature have been discussed. The published guidelines and reports that have studied the effects of WPT systems on human health are also given. In addition, suggested methods in the literature for protection from exposure are discussed. The control section gives the common charging control techniques and focuses on the constant current-constant voltage (CC-CV) approach, which is usually used for EV battery chargers.

A critical review on inductive wireless power transfer charging system in electric vehicle

“…Only this region suffers from significant losses. Furthermore, the author of the research 29 claims that using water as a medium in an underwater WPT system results in a 5% minimum efficacy relatively when correlated to a system of air‐gap system. The medium is air in this case.…”

“…Consequently, the research on WPT systems will never stop and keep going on for over a century but nowadays it enhances with more number of energies because of the improvement of EV technology. In review literature, 29 the author Brown et al differentiated the history of the WPT systems and divided them into three timelines. Table 1 depicts the major progression in the development and history of WPT.…”

Modern Advances in Magnetic Materials of Wireless Power Transfer Systems: A Review and New Perspectives

“…Wireless power transfer (WPT) technology has developed rapidly in recent years because of its unique advantages over traditional cable power supply methods [ 1 , 2 , 3 , 4 , 5 ]. It can significantly improve the reliability, convenience, and safety of the electric energy supply and solve the problems of sparks and maintenance difficulties caused by traditional plug-in power transmission modes [ 6 , 7 , 8 ].…”

Coil Parameter Analysis in Wireless Electric Vehicle Charging

“…1: Parts of a wireless EV charging system [1] The charging process begins from the grid supply which can be from renewable or non-renewable sources. Since, the standard frequency for induction power transfer is 85kHz (recent standard) or 20kHz (old standard) [2], the supply of the grid must be converted before supplying it to the coils, which can be achieved by AC/AC frequency converter. It converts the frequency in two stages: first the input AC is converted to DC and again it is converted back to AC with high frequency using inverters.…”

“…The number of coils used can also be multiple which can increase the amount of power transfer since double power can be transferred using two sets of coils than when a single set of coils are used [5]. Now, the AC produced through secondary coils needs to be converted to DC to charge the battery by using full bridge rectifiers [2]. BMS monitors and protects the batteries by estimating its operational state and optimizing the performance.…”