基于Simulink大功率电子管放大器仿真

Simulation on high-power tetrode amplifier based on Similink

选用4616V4型四极电子管,单管输出350kW,采用两路并行放大链路,设计了一套输出功率350kW×2的大功率电子管功率源系统。基于四极电子管的恒流特性曲线及实验数据,拟合输出功率与阳极电压、输入功率的关系曲线,利用Origin软件拟合函数,建立数学模型,并利用闭环比例-积分(PI)反馈控制,稳定输出电压,通过Simulink仿真探寻最佳工作点,较低的阳极电压以及近饱和的输入功率既能有效增大工作频率,又能满足高功率输出的要求,仿真结果与实际联机调试数据对比,误差低于5%,根据仿真数据得到的结论与13点分析法一致,可以有效指导探寻最佳工作点。

For a high energy proton radio frequency quadrupole(RFQ)accelerator which requires a RF power source of 324 MHz and 570 kW,4616V4tetrode which can output 350 kW is chosen as the main amplifier.Two tetrodes together can provide an RF power of about 700 kW and meet the design requirement.During the construction of the RF source,simulation studies based on Simulink,tetrode's constant current characteristic curve and experimental data are performed for the optimization of the system working conditions,such as anode voltage,input power,working point and output power.Low anode voltage and nearly saturated input power amplifier can effectively increase the operating frequency.The simulation method is verified with the experimental data setup and the conventional 13-point approximate integral method.As a result,the relative error is less than 5%.