实现快速故障保护的IGBT驱动电路

IGBT Driving Circuit with Rapid Fault Protection

针对较复杂的变流系统中,主控系统的延滞会影响IGBT模块故障保护失败的问题,设计一种快速故障保护的IGBT驱动电路。分析了现有应用方式存在HCPL-316J 2个输入端中的另一个端子的功能没有得到充分利用的缺陷,通过对HCPL-316J的信号输入端Vin+、Vin-和故障信号反馈端FAULT的应用研究,改进为FAULT信号反馈回另一个输入端子,光耦芯片故障信号发出后立即封锁IGBT驱动信号,完全消除了主控程序运行时长对故障保护的影响。实际应用结果表明:该设计故障保护响应迅速,运行稳定可靠。

In view of the problem that the delay of the main control system would cause failure to IGBT protection in complex converter system, the IGBT driving circuit with rapid fault protection circuit was designed. Analyze one underutilized terminal in 2 HCPL-316 J input terminals in existing application, through carrying out application research on HCPL-316 J signal input terminal Vin＋ and Vin- and fault signal feedback terminal FAULT, change the FAULT signal to feedback to the other input terminal, immediately lock IGBT drive signal after sending out optical coupler chip fault signal, totally eliminate influence of long time main control program operating on fault protection. The actual application results show that this design has rapid fault protection and stable operation.