Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Power Receiving Unit for High Power Resonant Wireless Power Transfer

Ching-Yao Liu
ORCID logo ,
Hsien-Chung Tang
ORCID logo ,
Yueh-Tsung Shieh
,
Chih-Chiang Wu
,
Wei-Hua Chieng
* ,
Edward-Yi Chang
,
Daisuke Ueda
Version 1 : Received: 23 October 2023 / Approved: 23 October 2023 / Online: 23 October 2023 (15:25:06 CEST)

A peer-reviewed article of this Preprint also exists.

Liu, C.-Y.; Tang, H.-C.; Shieh, Y.-T.; Wu, C.-C.; Chieng, W.-H.; Chang, E.-Y.; Ueda, D. Power Receiving Unit for High-Power Resonant Wireless Power Transfer. Energies 2023, 16, 7856. Liu, C.-Y.; Tang, H.-C.; Shieh, Y.-T.; Wu, C.-C.; Chieng, W.-H.; Chang, E.-Y.; Ueda, D. Power Receiving Unit for High-Power Resonant Wireless Power Transfer. Energies 2023, 16, 7856.

Abstract

A new power receiving unit (PRU) is proposed in this paper for the 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 50cm away from a PTU installed on the ground. The proposed PRU uses only the passive elements such as inductors, diodes and the capacitors, which needs 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. At a switching frequency of the resonant WPT in the experiment being 4MHz, the proposed PRU behaves itself as a negative impedance converter (NIC) in the subharmonics of 4MHz. 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 demonstrates a battery charging of 150W from 50cm away using three D-mode GaN HEMT transistors via the instability current ramp. The power transfer efficiency (PTE) improved as the power delivered to load (PDL) goes higher. The best power transfer efficiency (PTE) is 65% in the present findings. The simulation analysis shows that the circuit allows 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 amplifier; gallium nitride

Subject

Engineering, Mechanical Engineering

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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