数字化双模高效率射频功率源  

High efficiency digital RF power source with dual frequency mode

作　　者：李亚东 赵二刚[1] 俞梅 卫娜 张建军[1] Li Yadong;Zhao Ergang;Yu Mei;Wei Na;Zhang Jianjun(College of Electronic Information and Optical Engineering,Nankai University,Tianjin 300350,China)

机构地区：[1]南开大学电子信息与光学工程学院

出　　处：《电子技术应用》2019年第6期15-18,22,共5页Application of Electronic Technique

摘　　要：射频功率源作为射频电源系统的核心组件之一,其频率固定、转换效率低下,已经成为了制约射频电源系统发展的瓶颈。针对这一问题,提出了射频功率源在双频率工作模式之间自由切换的设计方案。采用直接数字式频率合成器(Direct Digital Synthesizer,DDS)作为射频信号源,选用德国IXYS公司的MOSFTE完成小信号的放大,提高了输出频率稳定度和转换效率;采用并联电感的方法降低了开关时的功率损耗;利用数控式选择开关切换选频网络,从而实现系统在双频率下的适配。同时对提出的方案及理论进行Multisim仿真验证。经过实物测试,该射频功率源可以在300 W额定功率下实现13.56 MHz和27.12 MHz双频率选择输出,转换效率能够达到90.1%。As one of the core components of the RF power system,the RF power source has a fixed frequency and low conversion efficiency,which has become a bottleneck restricting the development of the RF power system.Aiming at this problem,a design scheme for freely switching the RF power source between dual frequency operation modes is proposed.Direct Digital Synthesizer is used as the RF signal source.The MOSFTE producted by IXYS Company of Germany is used to achieve the amplification of small signals,which improves conversion efficiency and the stability of the output frequency.The method of parallel inductors reduces power loss during switching time.Switching the frequency selection network with a digital-controlled switch achieves adaptation of the system at dual frequencies.At the same time,Multisim simulation is carried out on the proposed scheme and theory.After actual testing,the RF power source can achieve dual frequency selection output of 13.56 MHz and 27.12 MHz at 300 W,and the conversion efficiency can reach 90.1%.

关 键 词：射频功率源 E类放大器 双频模式 

分 类 号：TN710[电子电信—电路与系统]