小型化行波管灯丝电源设计

摘要

The basic working process and special requirements for traveling wave tube filament for power supply are introduced and the characteristics of filament are also analyzed.The particularity and difficulty of filament power supply design are thoroughly analyzed.Based on the Topswitch series control chip performance and characteristics,the main circuit of the flyback converter of the filament power supply is designed.According to the start-up characteristics of the filament and the basic requirements of stability,a high precision feedback circuit and a current limiting circuit are designed.The feasibility of the hardware implementation is verified through experimental works with a prototype.The simulation experiment,laboratory and harsh environment test results show that the main circuit,feedback circuit and current limiting circuit can well meet the traveling wave tube filament requirements.%综述了行波管灯丝基本工作过程及其对电源的特殊要求,分析了行波管灯丝负载基本特性,对灯丝电源设计的特殊性及问题进行了深入细致分析,通过对Topswitch系列控制芯片的性能特点分析,设计了以反激变换器为主电路的灯丝电源.根据灯丝启动特点及其对电源稳定性基本要求设计了高精度反馈电路与限流电路.通过Pspice仿真、样机实验及例行试验测试,验证了理论分析及设计的合理性与可行性,仿真与测试结果表明电源主电路、反馈电路及限流电路能够很好地满足行波管灯丝对电源的各项指标要求.