OverCurrent Protection and Analysis of CINRAD/SA Switch IGBT
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Abstract:
The analysis and processing of the overcurrent 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 overcurrent of the switch IGBT is monitored by its chip EXB841, and the overcurrent 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 overcurrent protection. The charging circuit faults result in the sudden current change of primary transformers and IGBTs,leading to the L〖SX(〗di〖〗dt〖SX)〗 changes in inductive voltage at both ends, the reverse electric potential difference between the IGBT C and E, the fast turnon diode cutoff, the overcurrent in EXB841 monitoring, and the quick cutoff of IGBT, as well as IGBT of the protection switch component.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.