A Long-Range, High-Efficiency Resonant Wireless Power Transfer via Imaginary Turn Ratio Air Voltage Transformer
This paper presents a resonant wireless power transfer method that leverages a 90-degree voltage phase shift between the transmitting and receiving coils to enhance efficiency and maximize power transfer. When the resonant coupling is achieved, the secondary coil with an adjustable capacitor forms a...
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-03-01
|
| Series: | Energies |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1073/18/6/1329 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850204038191120384 |
|---|---|
| author | Hsien-Chung Tang Chun-Hao Chen Edward-Yi Chang Da-Jeng Yao Wei-Hua Chieng Jun-Ying He |
| author_facet | Hsien-Chung Tang Chun-Hao Chen Edward-Yi Chang Da-Jeng Yao Wei-Hua Chieng Jun-Ying He |
| author_sort | Hsien-Chung Tang |
| collection | DOAJ |
| description | This paper presents a resonant wireless power transfer method that leverages a 90-degree voltage phase shift between the transmitting and receiving coils to enhance efficiency and maximize power transfer. When the resonant coupling is achieved, the secondary coil with an adjustable capacitor forms a tuned LC circuit. If the primary coil is driven at the resonant frequency of both the primary and secondary sides, the system can transmit 250W of power between the coils over a distance of 50 cm. Using a single power transmitting unit (PTU) board with multiple paralleled gallium nitride high-electron-mobility transistors (GaN HEMTs), the system achieves a maximum power transfer efficiency of 88%, highlighting the effectiveness of the design in high-efficiency, long-distance wireless power transmission. The key to the success of high-power, high-efficiency RWPT is in exhibiting the imaginary turn ratio presented on the air transformer. The imaginary turn ratio can realize the negative impedance conversion that converts the positive resistance on the power-receiving unit into a negative one, and thus, the damping of the resonance oscillation becomes negative and positively encourages more power to be delivered to the power-receiving unit (PRU) load. This paper derives the theory of the imaginary turn ratio and demonstrates the implementation of the RWPT system that exhibits the imaginary turn ratio effect. |
| format | Article |
| id | doaj-art-f8c73bf1626545d8a0ef8f2ff4c9afe2 |
| institution | OA Journals |
| issn | 1996-1073 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj-art-f8c73bf1626545d8a0ef8f2ff4c9afe22025-08-20T02:11:22ZengMDPI AGEnergies1996-10732025-03-01186132910.3390/en18061329A Long-Range, High-Efficiency Resonant Wireless Power Transfer via Imaginary Turn Ratio Air Voltage TransformerHsien-Chung Tang0Chun-Hao Chen1Edward-Yi Chang2Da-Jeng Yao3Wei-Hua Chieng4Jun-Ying He5Department of Mechanical Engineering, College of Engineering, National Yang-Ming Chiao-Tung University, Hsinchu 30010, TaiwanDepartment of Material Science and Engineering, International College of Semiconductor Technology, National Yang-Ming Chiao-Tung University, Hsinchu 30010, TaiwanDepartment of Material Science and Engineering, International College of Semiconductor Technology, National Yang-Ming Chiao-Tung University, Hsinchu 30010, TaiwanDepartment of Power Mechanical Engineering, College of Engineering, National Tsing Hua University, Hsinchu 30013, TaiwanDepartment of Mechanical Engineering, College of Engineering, National Yang-Ming Chiao-Tung University, Hsinchu 30010, TaiwanDepartment of Mechanical Engineering, College of Engineering, National Yang-Ming Chiao-Tung University, Hsinchu 30010, TaiwanThis paper presents a resonant wireless power transfer method that leverages a 90-degree voltage phase shift between the transmitting and receiving coils to enhance efficiency and maximize power transfer. When the resonant coupling is achieved, the secondary coil with an adjustable capacitor forms a tuned LC circuit. If the primary coil is driven at the resonant frequency of both the primary and secondary sides, the system can transmit 250W of power between the coils over a distance of 50 cm. Using a single power transmitting unit (PTU) board with multiple paralleled gallium nitride high-electron-mobility transistors (GaN HEMTs), the system achieves a maximum power transfer efficiency of 88%, highlighting the effectiveness of the design in high-efficiency, long-distance wireless power transmission. The key to the success of high-power, high-efficiency RWPT is in exhibiting the imaginary turn ratio presented on the air transformer. The imaginary turn ratio can realize the negative impedance conversion that converts the positive resistance on the power-receiving unit into a negative one, and thus, the damping of the resonance oscillation becomes negative and positively encourages more power to be delivered to the power-receiving unit (PRU) load. This paper derives the theory of the imaginary turn ratio and demonstrates the implementation of the RWPT system that exhibits the imaginary turn ratio effect.https://www.mdpi.com/1996-1073/18/6/1329weakly coupled magnetic resonanceresonant wireless power transferlong-range WPTGaN HEMT |
| spellingShingle | Hsien-Chung Tang Chun-Hao Chen Edward-Yi Chang Da-Jeng Yao Wei-Hua Chieng Jun-Ying He A Long-Range, High-Efficiency Resonant Wireless Power Transfer via Imaginary Turn Ratio Air Voltage Transformer Energies weakly coupled magnetic resonance resonant wireless power transfer long-range WPT GaN HEMT |
| title | A Long-Range, High-Efficiency Resonant Wireless Power Transfer via Imaginary Turn Ratio Air Voltage Transformer |
| title_full | A Long-Range, High-Efficiency Resonant Wireless Power Transfer via Imaginary Turn Ratio Air Voltage Transformer |
| title_fullStr | A Long-Range, High-Efficiency Resonant Wireless Power Transfer via Imaginary Turn Ratio Air Voltage Transformer |
| title_full_unstemmed | A Long-Range, High-Efficiency Resonant Wireless Power Transfer via Imaginary Turn Ratio Air Voltage Transformer |
| title_short | A Long-Range, High-Efficiency Resonant Wireless Power Transfer via Imaginary Turn Ratio Air Voltage Transformer |
| title_sort | long range high efficiency resonant wireless power transfer via imaginary turn ratio air voltage transformer |
| topic | weakly coupled magnetic resonance resonant wireless power transfer long-range WPT GaN HEMT |
| url | https://www.mdpi.com/1996-1073/18/6/1329 |
| work_keys_str_mv | AT hsienchungtang alongrangehighefficiencyresonantwirelesspowertransferviaimaginaryturnratioairvoltagetransformer AT chunhaochen alongrangehighefficiencyresonantwirelesspowertransferviaimaginaryturnratioairvoltagetransformer AT edwardyichang alongrangehighefficiencyresonantwirelesspowertransferviaimaginaryturnratioairvoltagetransformer AT dajengyao alongrangehighefficiencyresonantwirelesspowertransferviaimaginaryturnratioairvoltagetransformer AT weihuachieng alongrangehighefficiencyresonantwirelesspowertransferviaimaginaryturnratioairvoltagetransformer AT junyinghe alongrangehighefficiencyresonantwirelesspowertransferviaimaginaryturnratioairvoltagetransformer AT hsienchungtang longrangehighefficiencyresonantwirelesspowertransferviaimaginaryturnratioairvoltagetransformer AT chunhaochen longrangehighefficiencyresonantwirelesspowertransferviaimaginaryturnratioairvoltagetransformer AT edwardyichang longrangehighefficiencyresonantwirelesspowertransferviaimaginaryturnratioairvoltagetransformer AT dajengyao longrangehighefficiencyresonantwirelesspowertransferviaimaginaryturnratioairvoltagetransformer AT weihuachieng longrangehighefficiencyresonantwirelesspowertransferviaimaginaryturnratioairvoltagetransformer AT junyinghe longrangehighefficiencyresonantwirelesspowertransferviaimaginaryturnratioairvoltagetransformer |