E类功率放大器负载变化对工作特性的影响分析

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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。

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	邓思建
	谭坚文
	廖瑞金
	叶方伟
	曾德平
	刘青松

关键词 ： E类功率放大器, 负载变化, 输出功率, 工作效率, 开关管应力

Abstract：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.

Key words： Class E power amplifier load variation output power working efficiency switch stress

收稿日期: 2013-10-22 出版日期: 2015-04-13

PACS:

TM133

基金资助:国家重大科研仪器设备研制专项（81127901）和重庆市科技计划（cstc2013jcyjA10081,cstc2013yykfA40004）资助项目

作者简介: 邓思建男,1988年生,硕士研究生,研究方向为高强度聚焦超声治疗技术和电磁兼容。谭坚文男,1980年生,博士,讲师,研究方向为电力电子、电磁防护与电磁兼容和电工理论与新技术。

引用本文:

邓思建,谭坚文,廖瑞金,叶方伟,曾德平,刘青松. E类功率放大器负载变化对工作特性的影响分析[J]. 电工技术学报, 2015, 30(4): 98-105. Deng Sijian,Tan Jianwen,Liao Ruijin,Ye fangwei,Zeng Deping,Liu Qingsong. Load Variation Effect on Performance of Class E Power Amplifier. Transactions of China Electrotechnical Society, 2015, 30(4): 98-105.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2015/V30/I4/98

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