Power Receiving Unit for High-Power Resonant Wireless Power Transfer

Ching-Yao Liu, Hsien-Chung Tang, Yueh-Tsung Shieh, Chih-Chiang Wu, Wei-Hua Chieng (), Edward-Yi Chang and Daisuke Ueda
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Ching-Yao Liu: Department of Mechanical Engineering, College of Engineering, National Yang-Ming Chiao-Tung University, Hsinchu 30010, Taiwan
Hsien-Chung Tang: Department of Mechanical Engineering, College of Engineering, National Yang-Ming Chiao-Tung University, Hsinchu 30010, Taiwan
Yueh-Tsung Shieh: Department of Mechanical Engineering, College of Engineering, National Yang-Ming Chiao-Tung University, Hsinchu 30010, Taiwan
Chih-Chiang Wu: Mechanical and Mechatronics Systems Research Laboratories, Industrial Technology Research Institute, Hsinchu 31040, Taiwan
Wei-Hua Chieng: Department of Mechanical Engineering, College of Engineering, National Yang-Ming Chiao-Tung University, Hsinchu 30010, Taiwan
Edward-Yi Chang: Department of Material Science and Engineering, College of Engineering, National Yang-Ming Chiao-Tung University, Hsinchu 30010, Taiwan
Daisuke Ueda: Department of Material Science and Engineering, College of Engineering, National Yang-Ming Chiao-Tung University, Hsinchu 30010, Taiwan

Energies, 2023, vol. 16, issue 23, 1-23

Abstract: A new power receiving unit (PRU) is proposed in this paper for resonant wireless power transfer (WPT), which is characterized by the capability of attracting high power from the power transmitting unit (PTU). The resonant WPT is designed for delivering the electrical power to the PRU attached on an electrical vehicle (EV) chassis 50 cm away from a PTU installed on the ground. The proposed PRU uses only the passive elements such as inductors, diodes, and capacitors, which need no initial power from the EV. It is then applicable for charging a battery to several hundred volts for even a first-time charging battery. For a resonant WPT at a switching frequency of 4 MHz, the proposed PRU behaves as a negative impedance converter (NIC) itself in the subharmonics of 4 MHz. The NIC effect plus the subharmonic oscillation causes an instability current charging the battery connected to the PRU. In this paper, we simulated the PRU and performed the experiment. The experiment demonstrated a battery charging of 150 W from 50 cm away using three D-mode GaN HEMT transistors via the instability current ramp. The power transfer efficiency (PTE) improved as the power delivered to the load (PDL) increased. The peak PTE was 65% in the present findings. The simulation analysis showed that the circuit allowed itself be used to much higher power transfer when it is implemented with more GaN HEMT transistors connected in parallel. The theoretical derivation of the PRU circuit is also used to support both the experimental and simulation results.

Keywords: power receiving unit; resonant wireless power transfer; class E power amplifier (PA); gallium nitride (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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