基于门极放电补偿的串联IGBT有源驱动电路  

Active Gate Drive with Discharge Compensation for Series-Connected IGBT

作　　者：周野 王旭[1] 鲜亮[2] 杨丹[1] Zhou Ye;Wang Xu;Xian Liang;Yang Dan(School of Information Science&Engineering,Northeastern University,Shenyang,110819,China;Energy Research Institute,Nanyang Technological University,627590,Singapore)

机构地区：[1]东北大学信息科学与工程学院,沈阳110819 [2]南洋理工大学能源研究院,新加坡627590

出　　处：《电工技术学报》2021年第18期3934-3945,共12页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(51607029,61836011)。

摘　　要：针对串联IGBT关断期间存在的分压不均问题,该文提出一种旨在补偿关断瞬态各IGBT输入电容放电偏差的有源驱动电路以实现电压平衡控制。该驱动电路由产生补偿电量的电流吸收电路、基于实时承压实现闭环控制的控制采样电路及将高速高带宽模拟器件与相对低速控制算法相结合的触发电路三部分构成。与其他应用于IGBT串联的有源驱动电路相比,该电路仅使用原驱动IC输出信号的下降沿作为触发信号,且不引入额外的电源与信号隔离单元,易于与现有驱动电路相结合。控制采样周期与IGBT开关周期一致,避免了昂贵的高频控制芯片及模数/数模转换器的使用。该文在分析串联IGBT关断过程中门极放电偏差产生原因的同时对该驱动电路各部分原理予以说明,并给出其参数选取与设计原则。最后,通过实验验证了该驱动方案在串联IGBT均压控制上的有效性与适用性。An active gate drive circuit for mitigating charge deviations among input capacitances of IGBTs during the turn-off transient is proposed in this paper to solve the problem of unbalanced voltage sharing among series-connected IGBTs.The circuit consists of a compensation providing current sink circuit,a closed-control and sampling circuit,and a triggering circuit that combines high-bandwidth analog parts with the relatively low-frequency control algorithm.Compared with other active gate drive circuits applied in series-connected IGBTs,the proposed circuit is only triggered by the falling-edge of the signal generated from the original gate drive IC,and does not introduce any additional power supply or signal isolation unit,which is easy to combine with commercial gate drive ICs.The frequency of sampling and control is consistent with the switching frequency of the IGBT,avoiding the use of expensive high-frequency control chips or AD/DA converters.Based on the analysis of the gate discharge deviations during the turn-off transient,the operational principle and design guideline for each module of the proposed driving circuit are specified.Experimental results verify the effectiveness and applicability of this driving scheme in voltage equalization control of series IGBTs.

关 键 词：串联IGBT 放电补偿 有源驱动 电压平衡 

分 类 号：TM46[电气工程—电器]