ZTE Communications ›› 2022, Vol. 20 ›› Issue (2): 28-36.doi: 10.12142/ZTECOM.202202005

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Dynamic Power Transmission Using Common RF Feeder with Dual Supply

DUONG Quang‑Thang1(), VO Quoc‑Trinh2, PHAN Thuy‑Phuong1, OKADA Minoru1   

  1. 1.Nara Institute of Science and Technology, Nara 630-0192, Japan
    2.FPT University Da Nang, Da Nang 50500, Vietnam
  • Received:2022-04-18 Online:2022-05-24 Published:2022-05-24
  • About author:DUONG Quang-Thang(thang@is.naist.jp) received the BE, ME, and PhD degrees in communications engineering from Osaka University, Japan in 2009, 2011, and 2014, respectively. He is currently an assistant professor with the Nara Institute of Science and Technology, Japan. His research interests include broadband wireless access techniques, channel estimation, information theory, error correcting codes, wireless power transfer, and simultaneous wireless information and power transfer. He is a member of the Institute of Electrical, Information and Communication Engineers (IEICE) and the Institute of Electrical and Electronics Engineers (IEEE). He is the recipient of the Young Engineer Award and the Michiyuki Uenohara Memorial Award from the IEEE Microwave Theory and Techniques Society (IEEE-MTTS) Japan Chapter in 2019.|VO Quoc-Trinh received the BE degree in electronics & telecommunications engineering from the Da Nang University of Science and Technology, Vietnam in 2010, and the ME degree in electronics engineering from International University-Vietnam National University, Vietnam in 2013, and the DEng degree from the Nara Institute of Science and Technology, Japan in 2021. He is currently a lecturer with FPT University Da Nang, Vietnam. His current research interests include wireless power transfer, digital signal processing, and wireless channel estimation.|PHAN Thuy-Phuongreceived the BE degree in electronics and communication engineering from The University of Da Nang, Vietnam in 2018. She is currently pursuing an ME degree with the Nara Institute of Science and Technology, Japan. Her current research interests include wireless power transfer and wireless communication systems.|OKADA Minoru received the BE degree from the University of Electro-Communications, Japan in 1990, and the ME and PhD degrees from Osaka University, Japan in 1992 and 1998, respectively, all in communications engineering. In 2000, he joined the Graduate School of Information Science, Nara Institute of Science and Technology, Japan, as an associate professor and became a professor. From 1993 to 2000, he was a research associate with Osaka University. From 1999 to 2000, he was a visiting research fellow with the University of Southampton, UK. His research interest is wireless communications, including WLAN, WiMAX, CDMA, OFDM, and satellite communications. He was a recipient of the Young Engineer Award from the Institute of Electrical, Information, and Communication Engineers (IEICE) in 1999. He is a member of the Institute of Television Engineers of Japan, IEICE of Japan, and the Information Processing Society of Japan.
  • Supported by:
    JSPS KAKENHI(20K14736)

Abstract:

This paper proposes the design concept of a dynamic charging system for electric vehicles using multiple transmitter coils connected to a common radio frequency (RF) feeder driven by a pair of two power supplies. Using a common RF feeder for multiple transmitter coils reduces the power electronic redundancy compared to a conventional system, where each transmitter coil is individually driven by one switched-mode power supply. Currently, wireless charging of electric vehicles is recommended to operate in the frequency range of 85 kHz and beyond. In this frequency range, the signal wavelength is shorter than about 3.5 km. Therefore, a charging pad longer than several hundred meters is subject to the standing wave effect. In such a case, the voltage significantly varies along the RF feeder, resulting in a variation in the received power level when the receiver moves. Specifically, the received power significantly deteriorates when the receiver is nearby a node of the voltage standing wave. In this paper, we employ a pair of two power sources which are electrically separated by an odd-integer number of the quarter wavelength to drive the RF feeder. As a result, the voltage standing wave generated by one power source is complemented by that of the other, leading to stable received power and transmission efficiency at all the receiver’s positions along with the charging pad. Simulation results at the 85 kHz frequency band verify the output power stabilization effect of the proposed design. It is worth noting that the proposed concept can also be applied to simultaneous wireless information and power transfer (SWIPT) for passive radio frequency identification (RFID) tags by raising the operation frequency to higher industrial, scientific and medical (ISM) bands, e.g., 13.56 MHz and employing similar modulation methods as in the current RFID technology.

Key words: dynamic charging, common RF feeder, standing wave, dual power supply