Chip-Level Fault Diagnosis Process of CINRAD/SA Filament Power Supply Based on FTA

Pan Ti; Du Yundong

doi:10.16765/j.cnki.1673-7148.2026.01.012

Abstract：The transmitter filament power supply mainly provides power for the radar klystron fila-ment,which features complex circuit and suffers a high failure rate.Based on the signal flow of the fila-ment power supply in the SA-type China New Generation Weather Radar(CINRAD/SA),this study con-ducted a layer-by-layer fault tree analysis to trace the causal relationship of faults and established a logical and standardized chip-level fault diagnosis procedure combined with the waveform characteristics of criti-cal test points in the filament power supply.Through this process,the malfunction where the filament power supply ceased operation during power-on process due to abnormal alarm thresholds was successfully repaired.Among them,the undervoltage alarm was accompanied by the activating of the filament power supply voltage fault indicator light on the transmitter panel,while the overvoltage alarm was accompanied by the filament power supply panel fault indicator light illuminated.The results of the above two success-ful fault repair cases show that the fault tree analysis method can effectively optimize the chip-level fault diagnosis process and effectively improve the efficiency of fault diagnosis.The combination of chip-level fault diagnosing technique and approach and the chip-level fault diagnosing process established based on critical-test-point waveform enables rapid localization of faults to the minimal cut set(at chip level)of the fault tree.Owing to its standardized steps and clear logic,this method is easy for technicians to mas-ter and can greatly enhance maintenance efficiency and cut repair costs.Based on the chip-level fault di-agnosing process,by developing test procedures and fault repair modeling software,automatic localization of faults at the chip level becomes feasible,which could provide a key technical support for automated chip-level fault diagnosis in meteorological radar maintenance platforms.