摘要
本文基于功率合成网络散射参数,理论分析反射功率形成的机理,研究极限反射功率存在的条件,并提出合成网络优化方案。仿真计算和实验结果表明,当输出端失配,且固态功率源中仅一路功放模块失效时,部分模块可能承受接近4倍模块额定输出的反射功率,模块存在损毁风险。合成路数一定的情况下,通过优化合成网络级间电长度等参数破坏极限反射功率条件,可有效降低极限反射功率。
Solid state amplifier(SSA)has been increasingly applicated in accelerators facilities in recent years.However,with the improvement of the power level,equipment failure caused by reflected power becomes the main risk in long-term operation of SSA.A high-power SSA is usually composed of multiple power amplifier modules through power combiner nets.When the power amplifier modules with unequal amplitudes and SSA operate under a full reflection caused by arcing of the cavity,the modules may be easily damaged due to excessive reflected power.The optimization of the power combiners is an effective means for improving the stability of SSAs under high power reflection.In this paper,the mechanisms and conditions under which reflection power arises were analyzed by using the scattering parameter of the combiner,and the optimization scheme of the combiner to reduce the maximum reflected power was proposed.In addition,a set of 500 MHz 8-way power combiner experimental facility was designed to verify the result of theoretical calculation under various working conditions.Simulation and experimental results show that the reflected power of the power amplifier module not only is related to the matching state of SSA,but also is related to the output state of the power amplifier module itself and parameters of combiner.The total reflected power of the power amplifier module is the sum of the reflected power from the mismatched load and the combined power from the other modules.When all the power amplifier modules of the SSA working perfectly,the reflected power of its own signal of a module is exactly compensated by the sum of the power with opposite phase from all other modules.In this case,the reflected power of the module is only related to the matching state of the SSA,and its maximum value is equivalent to the rated output power of the module.In another case,when one of the SSA’s power amplifier modules is switched off,the reflected power received by some of the modules may be as high as nearly 4 times the rated power of a s
作者
陈胜义
李晓
朱俊裕
张春林
龙巍
刘洋
刘盛画
陆志军
CHEN Shengyi;LI Xiao;ZHU Junyu;ZHANG Chunlin;LONG Wei;LIU Yang;LIU Shenghua;LU Zhijun(Spallation Neutron Source Science Center,Dongguan 523803,China;Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China)
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
2023年第6期1260-1270,共11页
Atomic Energy Science and Technology
基金
广东省基础与应用基础研究基金东莞市联合基金重点项目(2019B1515120046)。
关键词
固态功率源
反射功率
功率合成网络
S参数
solid state amplifier
reflection power
power combiner
S parameter
