IGBT过流保护电路设计-机电工程.PDF
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第29 卷第8 期 机 电 工 程 Vol. 29 No.8
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2012 年8 月 Journal of Mechanical Electrical Engineering Aug. 2012
IGBT 过流保护电路设计
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张海亮,陈国定 ,夏德印
(浙江工业大学 信息工程学院,浙江 杭州 310023)
摘要:为解决绝缘栅双极性晶体管(IGBT )在实际应用中经常出现的过流击穿问题,在分析了IGBT 过流特性和过流检测方法的基础
上,根据过流时IGBT 集电极电流的大小分别设计了过载保护电路和短路保护电路。过载保护电路在检测到过载时立即关断IGBT ,
根据不同的过载保护要求可实现持续封锁、固定时间封锁及单周期封锁IGBT 的驱动信号;短路保护电路通过检测IGBT 通态压降判
别短路故障,利用降栅压、软关断和降频综合保护技术降低短路电流并安全关断IGBT 。详细阐述了保护电路的保护机制及电路原
理,最后对设计的所有保护电路进行了对应的过流保护测试,给出了测试波形图。试验结果表明,IGBT 保护电路能及时进行过流检
测并准确动作,IGBT 在不同的过流情况下都得到了可靠保护。
关键词:绝缘栅双极性晶体管;过流保护;降栅压;软关断
中图分类号:TN386.2 ;TM 13 文献标志码:A 文章编号:1001-4551 (2012 )08-966-05
Design of IGBT over-current protection circuit
ZHANG Hai-liang ,CHEN Guo-ding ,XIA De-yin
(School of Information Engineering ,Zhejiang University of Technology ,Hangzhou 310023 ,China)
Abstract :In order to solve the over-current breakdown problem of insulated gate bipolar transistor (IGBT )in practical applications ,
short-circuit protection circuit and overload protection circuits were proposed according to the IGBTs collector current ,after the analysis
of IGBTs characteristics and over-current measures. When overload protection circuits detected over-current ,it switched off IGBT
immediately ,IGBTs drive signal can be blocked continuously ,for fixed time or for a single cycle based on different overload protection
requirements ;short-circuit protection circuit detected the over-current by measuring IGBTs on-state voltage drop ,using dropping the
grid voltage ,
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