摘要
为研究高频无极灯稳态工况下的阻抗,搭建了实验平台进行测量,结合数据处理获得阻抗,并对结果进行了进一步分析。首先归纳比较了无极灯在稳态工况条件下的3种等效模型,确定选用Babat模型处理实验数据。然后根据目标阻抗的基本特点,基于Nerone等人的测量方法,搭建了改进的实验平台,对不同功率下无极灯的输入电压、电流进行了测量。结合实验结果和Babat模型,计算得到目标阻抗。对阻抗数据的分析表明:随着功率增加,等离子体阻抗逐渐减小,无极灯电磁耦合系数逐渐增大;无极灯的动态阻抗在低功率下呈现出负阻抗特性,在高功率下则由于集肤效应加剧呈现出正阻抗特性。上述结果支持了Eckert关于无极灯在高功率下具有正阻抗特性的结论,否定了Shinomiya关于无极灯绝对负阻抗的论断。
To investigate the impedance of electrodeless lamp under stable operation, we set up an experimental platform to perform measurement. Processing the measurement results, we obtained and analyzed the impedance. Firstly, we summarized and compared three major different equivalent models of eleetrodeless lamp under stable operation mode, from which the Babat model was selected for processing experimental data. Then considering the characteristic of the impedance, using Nerone＇s measurement results, we set up a modified experimental platform, on which, the input voltage and input current of an eleetrodeless lamp under different input powers were measured. Finally, according to the measured data and Babat model, the plasma impedance was calculated. Analyses of the obtained impedance show that, with the increasing power, the plasma impedance decreases, but the coupling coefficient of electrodeless lamp increases. Moreover, the dynamic impedance of eleetrodeless lamp under stable operation mode is negative at low power, but it is positive at high power due to the intensification of skin effect. This results validate the Eckert＇s theory of electrodeless lamp＇s positive impedance characteristic at high power, meanwhile it falsifies the Shinomiya＇s theory of absolute negative impedance for electrodeless lamps.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2013年第4期923-927,共5页
High Voltage Engineering
基金
铁道部科技研究开发计划(J2011Z001)
神华集团与清华大学战略合作基础研究科研项目(20112000507)~~
关键词
无极灯
等离子体
稳态工况阻抗
Babat模型
负阻抗
集肤效应
electrodeless lamp
plasma
impedance under operation mode
Babat model
negative impedance
skin effect
