A brief review: basic coil designs for inductive power transfer

Abstract

The inductive power transfer (IPT) has contributed to the fast growth of the electric vehicle (EV) market. The technology to recharge the EV battery has attracted the attention of many researchers and car manufacturers in developing green transportation. In IPT charging system, the coil design is indispensable in enhancing the EV battery charging process performance. This paper starts by describing the two charging techniques; static charging and dynamic charging before further presents the IPT system descriptions. Afterwards, this paper describes a brief review of coil designs which discusses the critical factors that affect the power transmission efficiency (PTE) including their basic designs, design concepts and features merits. The discussions on the basic coil designs for IPT are of the circular spiral coil (CSC), square coil (SC), rectangular coil (RC), and double-D coil (DDC). Furthermore, the significant advantages and limitations of each research on different geometries are analyzed and discussed in this paper. Finally, this paper evaluates some essential aspects that influence the coil geometry designs in practical.

In-depth perception of dynamic inductive wireless power transfer development: a review

“…Figure 5. Simple illustration of DWC operation [2], [75] Precisely, for the power transmission to occur, the transmitter coils, which are coupled with the receiver coil on the EV, are placed together with the power source and CT network inside the road. There is an air-gap for both coils to couple, and this air-gap will also include the EV ground clearance to decide the suitable depth to bury the transmitter coil circuit system underneath the road.…”

“…After that, the energy power flows through the CT network to filter any impurities so that the energy transfer to the receiver coil is reduced in losses [49]. A detailed discussion on different CTs can be found in section 2 of the article [2]. The inductive charging can only produce a magnetic field with the presence of alternating current at the coils of both transmitter and receiver sides.…”

“…Tesla coils produced a high alternating current (AC) at suitable frequencies using highly resonant tuned coils that able to compensate the overall circuit in transmitting satisfactory power transmission efficiency (PTE) [1]. The frequency range starts from 10 kHz to 100 kHz [2]. However, regarding SAE J2954, the frequency for wireless power transfer of EV is limited to 85 kHz [2].…”

“…The frequency range starts from 10 kHz to 100 kHz [2]. However, regarding SAE J2954, the frequency for wireless power transfer of EV is limited to 85 kHz [2]. The inductively coupled coils were able to transmit an efficient power wirelessly since the coupled coils are placed with an air-gap between them (not physically connected).…”

Design of circular inductive pad couple with magnetic flux density analysis for wireless power transfer in EV

“…Wired technique is a traditional way of charging the electric vehicle. Whilst wireless charging of EV offers compactness and safety without any use of a cable due to charging competence [6]- [9]. However, there are some risk and 133 hazards when using wireless charging pad.…”