A Wireless Power Transfer System Using a Double DD Quadrature Coil Structure

Abstract

This paper presents the evolution of an inductive wireless power transfer using a multicoil system. The double DD coil structure on the transmitter and the receiver side using two perpendicular bipolar DD coils is upgraded with an additional nonpolar quadrature coil. The proposed structure can be called the double DDQ coil structure. All three coils are not coupled, due to the nature of the directional double DD coil. If the transmitter and the receiver are not misaligned to one another, the system behaves as three separate, uncoupled IPT systems. The main advantage of the proposed coil topology is additionally increased power density and increased misalignment tolerance. Additionally, when the transmitter and the receiver coil are perfectly aligned, the proposed pad structure can transmit three different voltages and can be excited with different frequencies. In the case of this paper, the three coils on the transmitter side were excited by the same frequency. The proposed coil was evaluated experimentally and compared to the system using double DD coil structure.

Misalignment tolerance improvement and high efficiency design for wireless power transfer system based on DDQ‐DD coil

“…Although the studies of Qu et al and Zhuang et al 18,19 obtain relatively high efficiency, they 18 require more coil material consumption, and both of them do not focus on the misalignment tolerance on the whole x‐axis. It is worth noting that the study of Domajnko and Prosen 21 explores the misalignment tolerance along the entire x‐axis, but its efficiency is lower than that of this paper. Moreover, this work employs two DD coils and a Q coil on each side and requires three rectifiers, which makes the receiving side complex.…”

“…To the authors' knowledge, most investigations have focused on the positive offset direction. 18,19,21 Contrastingly, there is a lack of research on the power transmission ability of DDQ coils along both positive and negative x-axis directions. This limitation can result in lower transmission efficiency for vehicles that are offset toward the mismatched position, thereby limiting the further application of DDQ coils.…”

“…Another contribution of this paper is the accomplishment of the symmetry lateral misalignment tolerance of DDQ coils in different offset directions. To the authors' knowledge, most investigations have focused on the positive offset direction 18,19,21 . Contrastingly, there is a lack of research on the power transmission ability of DDQ coils along both positive and negative x‐axis directions.…”

“…It is demonstrated that the misalignment tolerance range can be improved by matching the current flow direction between the secondary Q coil and the coupled rectangular portion of the primary DD coil. Domajnko et al 21 solved the lateral offset problem by using a 2DDQ coil structure. However, this method increases material consumption, and the efficiency is relatively low.…”

Optimal Design of Relay Coil Inductance to Improve Transmission Efficiency of Four-Coil Magnetic Resonance Wireless Power Transmission Systems

“…Research on omni-directional receivers was developed to reduce power transmission loss due to misalignment in wireless power transmission [2,3]. A study was undertaken to reduce the change in output due to the misalignment of electronic devices and electric vehicles using relay coils [4,5]. An analysis and design study strived to improve the Q-factor to increase the transmission distance in two-coil-type wireless power transmission [6].…”