摘要
E类功率放大器在实际工作情况下,终端负载可能偏离理论设计值,使功放工作特性发生改变,严重时甚至损坏开关管。本文从理论上对E类功放的电路参量进行了理论分析和推导,得到输出功率、工作效率和漏极电压等参数与负载之间的解析关系,并通过Saber电路仿真和实际电路测试进行了验证。分析结果表明,负载偏离最优负载时,输出功率下降,工作效率降低;当负载变低时,开关管漏极电压和电流峰值升高,使开关管电压和电流应力增加。本文得出的理论结果可确定E类功率放大器的负载容许变化范围,也为变负载条件下的E类功率放大电路设计和分析提供重要参考。
In practical situation, the terminal load of class E power amplifier may deviate from the theoretical design values to make the operating characteristics changing, even be damaged. In this paper, the circuit parameters of the class E power amplifier is analyzed theorectically. The analytical relationships between parameters of output power, efficiency, drain voltage and load are obtained and are verified by Saber simulation and actual circuit test. The results show that the output power and the working efficiency are decreased when the load deviates from the optimal load. When the load decreases, the peak of switch drain voltage and current rise to increase the switch stress of voltage and current. The derived theoretical results can determine the allowable range of the load in class E power amplifier and provide important reference for circuit design and analysis of class E power amplifier in variable load condition.
出处
《电工技术学报》
EI
CSCD
北大核心
2015年第4期98-105,共8页
Transactions of China Electrotechnical Society
基金
国家重大科研仪器设备研制专项(81127901)
重庆市科技计划(cstc2013jcyj A10081
cstc2013yykf A40004)资助项目
