Dynamic Power Transmission Using Common RF Feeder with Dual Supply
Release Date：2022-05-19 Author：DUONG Quang-Thang, VO Quoc-Trinh, PHAN Thuy-Phuong, OKADA Minoru Click：
Dynamic Power Transmission Using Common RF Feeder with Dual Supply
DUONG Quang-Thang1, VO Quoc-Trinh2,PHAN Thuy-Phuong1,OKADA Minoru1
(1. Nara Institute of Science and Technology, Nara 630-0192, Japan;
2. FPT University Da Nang, Da Nang 50500, Vietnam)
Abstract: This paper proposes a design concept of dynamic charging system for electric vehicle 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 or beyond. In this frequency range, the signal wavelength is shorter than about 3.5 km. Therefore, a charging pad longer than several hundreds of meters is subject to 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 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 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.
Keywords: dynamic charging; common RF feeder; standing wave; dual power supply
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