A 94% Peak Efficiency Class-E Power Amplifier with Auto-Aligned Current Phase for Guaranteed ZVS Under Impedance Variations
A 6.78 MHz load-independent Class-E power amplifier (PA) with auto-aligned current phase for wireless charging is proposed. It can adapt to rapid changes in real impedance and resolve mismatches in imaginary impedance. Consequently, this Class-E PA maintains zero-voltage switching (ZVS) for all switches and achieves efficient power transfer even during load transients and when driving reconfigurable resonant regulating rectifiers. The wireless power transfer (WPT) system delivers a maximum output power of 37.8 W, with peak transmitter efficiency of 94 % and peak end-to-end (E2E) efficiency of 86.3%.
Authors
- Wing‐Hung Ki (ORCID: https://orcid.org/0000-0002-7873-5643)
- Yuan Gao (ORCID: https://orcid.org/0000-0001-8565-1790)
- Chi-Ying Tsui (ORCID: https://orcid.org/0000-0002-8024-2637)
- Yingming Liu (ORCID: https://orcid.org/0000-0003-1204-6199)
Institutions
- Hong Kong University of Science and Technology (HK)
- Southern University of Science and Technology (CN)
Publication Details
- Published
- 2025-09-08
- DOI
- https://doi.org/10.1109/esserc66193.2025.11214131
- Primary Topic
- Wireless Power Transfer Systems
- Type
- article
- Field-Weighted Citation Impact
- 0.00