CINRAD发射机后充电校平器3A8工作原理及维修

Operation Principles and Maintenance of Post-Charge Regulator 3A8 for CINRAD Transmitter

后充电校平器3A8是中国新一代多普勒天气雷达(CINRAD/SA和SB)发射机的重要组成部分,其作用是当高压充电分机向人工线充电到额定值以后,通过不断采样人工线上的电压,在校平脉冲指令下,完成对人工线存储的电荷进行有控制的微量泄放,以提高人工线充电电压的脉间稳定度,减小射频输出的幅度和相位变化,最终保证雷达获得足够的地物杂波抑制,从而保证雷达系统高质量工作。为此,讨论了该组件的工作原理,对其电子线路组成作了进一步分析,根据台站工作的实际经验,结合相关报警信息,探讨了基本维修思路,总结了一些快速有效的检修方法。

The post-charge regulator 3A8 is an important part of CINRAD/SA and CINRAD/SB radar,which is used to gain enough ground clutter suppression for the radar system and to regulate the PFN charge voltage within 0.04 percent of the desired operating point until the PFN is discharged.After the PFN charge voltage being charged to the rated value from the charging transformer,the charges stored in the PFN can be controlled by selectable discharge by sampling the PFN charge voltage.So the cycle-to-cycle variation regulation by the post charge regulator minimizes the phase and amplitude variations in the RF output.The operating principles of Regulator 3A8 are discussed in details,and the analysis is made of the structure of the electronic circuit.Also a number of key point waveforms are discussed with the pulse sequence.Based on the maintenance experiences of the radar system,some simple and effective methods in troubleshooting and maintenance are introduced and summarized with the relevant alarm massages.