Efficiency Enhancement of Power Amplifier Using Power Pulsewidth Modulation for Wireless Power Transfer

被引：2
作者：
Yang, Chen [1 ]
Jin, Ke [1 ]
Zhou, Weiyang [1 ]
Hu, Huan [1 ]
Zhu, Xirui [2 ]
机构：
[1] Nanjing Univ Aeronaut & Astronaut, Coll Automat Engn, Nanjing 210016, Peoples R China
[2] Aerosp Syst Engn Shanghai, Shanghai 200240, Peoples R China
来源：
IEEE MICROWAVE AND WIRELESS TECHNOLOGY LETTERS | 2024年 / 34卷 / 09期
基金：
中国国家自然科学基金;
关键词：
Drain efficiency (DE); power amplifier (PA); power pulsewidth modulation (PPWM); wireless power transfer (WPT); ENVELOPE ELIMINATION;
D O I：
10.1109/LMWT.2024.3423760
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Power amplifier (PA) is the core device for dc-RF conversion in wireless power transfer (WPT) system. However, the drain efficiency (DE) of PA decreases significantly due to the load mismatch effect at low output power levels. In this letter, a power pulsewidth modulation (PPWM) power supply is proposed to enhance the wide-power-range efficiency of PA. In this way, the average output power demand is met, and the maximum DE can always be achieved when the output power backs off. A prototype comprising a driver amplifier, a 5.8-GHz/10-W class-F PA and a 30-W PPWM power supply is fabricated and tested in the lab. Experimental results and performance comparison are provided to verify the effectiveness of the proposed method.
引用
收藏
页码：1099 / 1102
页数：4
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