{"title":"Efficiency Enhancement of Power Amplifier Using Power Pulsewidth Modulation for Wireless Power Transfer","authors":"Chen Yang;Ke Jin;Weiyang Zhou;Huan Hu;Xirui Zhu","doi":"10.1109/LMWT.2024.3423760","DOIUrl":null,"url":null,"abstract":"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.","PeriodicalId":73297,"journal":{"name":"IEEE microwave and wireless technology letters","volume":"34 9","pages":"1099-1102"},"PeriodicalIF":0.0000,"publicationDate":"2024-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"IEEE microwave and wireless technology letters","FirstCategoryId":"1085","ListUrlMain":"https://ieeexplore.ieee.org/document/10595478/","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"0","JCRName":"ENGINEERING, ELECTRICAL & ELECTRONIC","Score":null,"Total":0}
引用次数: 0
Abstract
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.
功率放大器（PA）是无线功率传输（WPT）系统中直流-射频转换的核心器件。然而，由于低输出功率水平下的负载失配效应，功率放大器的漏极效率（DE）显著降低。本文提出了一种功率脉宽调制（PPWM）电源，以提高功率放大器的宽功率范围效率。这样，既能满足平均输出功率需求，又能在输出功率下降时始终达到最大 DE 值。在实验室中制作并测试了一个由驱动器放大器、5.8-GHz/10-W F 类功率放大器和 30-W PPWM 电源组成的原型。实验结果和性能比较验证了所提方法的有效性。
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