CINRAD/SA天气雷达开关组件IGBT过流保护与处理  

Over-Current Protection and Analysis of CINRAD/SA Switch IGBT

作　　者：汪章维 胡雪英[2] 弓宇恒[3] 王聆勤 

机构地区：[1]浙江省大气探测技术保障中心,杭州310017 [2]中国气象局气象探测中心,北京100081 [3]内蒙古自治区气象局,呼和浩特010051

出　　处：《气象科技》2015年第2期191-195,共5页Meteorological Science and Technology

摘　　要：CINRAD/SA雷达发射机常见的IGBT开关过流保护故障在CINRAD/SA雷达发射机的告警面板上没有明确指示,排查难度较大。IGBT开关的过流受驱动芯片EXB841监测,通过分析EXB841监测的过流条件,根据发生告警时的故障现象,分析得出CINRAD/SA雷达发射机充电回路故障是引起IGBT过流保护的主要原因。充电回路故障导致了充电变压器初级和IGBT的电流突变,电感两端电压发生变化,IGBT的C—E间的电势差出现反向,快速导通二极管截止,触发了EXB841的监测过流条件,迅速截止IGBT开关,保护开关组件的IGBT开关管。The analysis and processing of the over-current protection faults in IGBT （a common switch in CINRAD/SA radar transmitters）, are described. As the fault alarm has no sign in the CINRAD/SA radar transmitter alarm panel, the troubleshooting is difficult. The over-current of the switch IGBT is monitored by its chip EXB841, and the over-current protection is conducted according to the over current signal outputs to cut off the drive signal outputs timely. Through the analysis of the flow condition monitored by EXB841 and alarms when faults occur, it is found that charging circuit faults of CINRAD/SA radar transmitter are the main cause of the IGBT over-current protection. The charging circuit faults result in di the sudden current change of primary transformers and IGBTs, leading to the L di/dt changes in inductive voltage at both ends, the reverse electric potential difference between the IGBT C and E, the fast turn-on diode cut-off, the over-current in EXB841 monitoring, and the quick cut-off of IGBT, as well as IGBT of the protection switch component.

关 键 词：CINRAD/SA雷达 开关组件 IGBT 过流保护 EXB841 

分 类 号：TN86[电子电信—信息与通信工程]