CB型新一代天气雷达触发器故障分析

天气雷达的触发器为调制器可控硅提供触发放电信号,触发器故障后将导致调制器人工线无法放电,发射机停止工作。通过对一次CINRAD/CB新一代天气雷达触发器故障的详细分析,发现触发器控制板V1(IRF450,场效应管)导通时间过长是致使R33过热烧毁的主要原因。同时R33消耗功率过大又造成触发器电源板调整放大管V4、V5(MJ12005)过载烧毁。在分析触发器电路图和信号流程的基础上,介绍了此类故障的排除方法,并就如何预防此类故障发生提出了建议,旨在使技术保障人员掌握触发器组件的测试和维修方法,能在最短时间内排除故障。

Analysis of Trigger Failure in New Generation CINRAD/CB Weather Radar

The trigger of the new generation CINRAD/CB weather radar provides discharged signals for the modulator. In case of trigger failure, the transmitter cannot work properly. The reasons for failure and the solution are expatiated, based on the analysis of a radar trigger failure event. The main reason of R33 overheating is that the turn on time of the trigger control panel V1 (IRF450, MOSFET) was too long; meanwhile, the excessive power consumption of R33 led to the overload and burnout of the adjustment amplification tube V4, V5(MJ12005) of the trigger power board. Based on the analysis of signal processing circuit diagram and trigger circuitry, the troubleshooting methods and some suggestions to prevent the faults of the like are given, aiming to help technical support staff understand the test and maintenance methods of the trigger.