Abstract
For wireless electric vehicle charging, the relative position of the primary and secondary coils has significant impacts on the transferred power, efficiency and leakage magnetic flux. In this paper, a magnetic positioning method using simultaneous power and data transmission (SWPDT) is proposed for power coil alignment. Four signal coils are installed on the primary coil to detect the secondary coil position. By measuring the positioning signal amplitudes from the four signal coils, the power coil relative position can be obtained. Moreover, all the communication needed in the positioning process can be satisfied well by SWPDT technology, and no extra radio frequency (RF) communication hardware is needed. The proposed positioning method can work properly both in power transfer online condition and in power transfer offline condition. Thus, a highly integrated wireless charging system is achieved, which features simultaneous power transfer, data transmission and position detection. A positioning experimental setup is built to verify the proposed method. The experimental results demonstrate that the positioning resolution can be maintained no lower than 1 cm in a 1060 mm × 900 mm elliptical region for a pair of 510 mm × 410 mm rectangular power coils. The three-dimensional positioning accuracy achieves up to 1 cm.
Highlights
Wireless electric vehicle charging (WEVC) is gaining worldwide attention and developing very quickly [1,2,3]
To confirm the pickup coil being within the charging zone, the position detection of power coils is indispensable for a practical wireless charger, as described by SAE J2954 [13]
We have proposed a simultaneous wireless power and data transmission (SWPDT) system in [34], which is based on the frequency division multiplexing (FDM) technique and quadrature phase-shift keying (QPSK) modulation
Summary
Wireless electric vehicle charging (WEVC) is gaining worldwide attention and developing very quickly [1,2,3]. If the position detection method is of high accuracy, it can be combined with the autonomous parking technology to align the power coils accurately. This will reduce the need to design an IPT system with large misalignment tolerance. The magnetic positioning methods are of high accuracy, low cost, not susceptible to the environment and are easy to integrate with power pads. Based on the near-field communication technology in SWPDT, this paper proposes a magnetic positioning method, which has the following features:. A highly integrated IPT system for WEVC is achieved, i.e., simultaneous power transfer, data transmission and position detection. Magnetic Positioning Integrated with Near-Field Communication in Simultaneous Wireless
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