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基于EXB841的IGBT驱动与保护电路研究

摘要：本文叙述了绝缘栅双极型晶体管IGBT对驱动和保护电路的要求。并简要介绍了IGBT专用驱动芯片EXB841的驱动原理，进而针对EXB841典型IGBT驱动保护中存在的不足，提出了采用过流检测电路精确调整过流阈值，延迟电路识别虚假过流和过流锁定，采用外部成型电路提高负栅压和系统应用中及时的故障显示等改进方法。设计了相应的优化驱动电路，优化驱动电路在脉冲发生电源中得到应用。实际运行表明优化驱动电路克服了EXB841典型驱动的不足，改善了IGBT的驱动与保护性能，具有很好的实用性。 叙词：IGBT EXB841 驱动电路 故障显示 Abstract：This paper introduced the require of driving and protecting circuit for IGBT and gave a brief description of the Working principle of EXB841 that the special driving chip of IGBT. Based on the shortages of EXB841s typical driving circuit for IGBT, some effective countermeasures ,which included the over protection detecting circuit to modulate accurately over protection threshold , and the identifying and locking circuit of over-current malfunction to identify false over-current and to lock over-current , the external grid-voltage molding circuit to boost grid-voltage were put forward , and an optimum driving circuit was designed . The optimum dring circuit has been used in the pulse power of High-frequency and High-voltage . And the experiment result have proved that the optimum circuit not only overcomes the defects of EXB841 , but also improves greatly IGBTs driving and protection capability . As a result , the optimum circuit will have considerable value in practical application. Keyword：IGBT, EXB841, Driving circuit, Fault display

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