基于有源箝位技术的SiC MOSFET串联均压有源驱动电路研究  

Voltage Balancing Circuit for Series-connected SiC MOSFETs Based on Active Clamping

作　　者：项鹏飞 郝瑞祥[1] 王启丞 游小杰 徐云飞 袁帆 XIANG Pengfei;HAO Ruixiang;WANG Qicheng;YOU Xiaojie;XU Yunfei;YUAN Fan(School of Electrical Engineering,Beijing Jiaotong University,Haidian District,Beijing 100044,China;Collaborative Innovation Center of Railway Traffic Safety,Haidian District,Beijing 100044,China;State Key Laboratory of Advanced Power Transmission Technology(China Electric Power Research Institute),Changping District,Beijing 102209,China)

机构地区：[1]北京交通大学电气工程学院,北京市海淀区100044 [2]轨道交通安全协同创新中心,北京市海淀区100044 [3]先进输电技术国家重点实验室(中国电力科学研究院有限公司),北京市昌平区102209

出　　处：《中国电机工程学报》2024年第16期6565-6577,I0023,共14页PROCEEDINGS OF THE CHINESE SOCIETY FOR ELECTRICAL ENGINEERING

基　　金：国家重点研发计划项目(2022YFB2404100,2022YFB2404105)。

摘　　要：功率器件串联技术是实现高压应用的有效途径之一,而串联应用的主要制约因素是串联器件之间的动态均压问题。该文针对不均压条件下串联器件的关断行为进行了理论分析,探究不均压的产生机理,提出一种基于有源箝位技术的碳化硅金属-氧化物半导体场效应晶体管串联均压有源驱动,其利用有源箝位电路检测串联器件之间的电压不均衡,并箝位电压尖峰,通过反馈控制器件栅极电荷及开关瞬态行为实现均压。该方案不存在不均压的调节周期,即使在交变负载下依然能在每一个开关周期的关断时间内实现均压控制。此外,该文还详细介绍所提出方案的电路原理和参数设计过程,并通过试验验证该方案均压控制效果的有效性。结果表明,所提出方案具有有源箝位电路拓展性强的特点;是独立于原有栅极驱动电路的辅助电路,适用性强;且控制电路结构简单,无需可编程逻辑芯片和额外的信号隔离。The series connection technology of power semiconductor devices is one of the effective ways to achieve high-voltage applications.However,the dynamic voltage imbalance between the series devices is the main constraint of the series technology.In this paper,the turn-off behaviors of the series-connected voltage imbalance are analyzed and the mechanism of the imbalance voltage is obtained.Then,a voltage balancing circuit for series-connected silicon carbide metal-oxide-semiconductor field-effect transistor(SiC MOSFET)based on active clamping is proposed.It detects the voltage imbalance and clamps the peak voltage of the series devices by the active clamping circuit,and then controls the gate charge and switching transient behavior of the devices by feedback circuit,so as to realize voltage balancing during the turn-off process.There is no adjusted switching cycle with voltage imbalance in the method,which can realize series voltage balancing in each switching cycle even under the alternating load.Furthermore,the circuit principle and parameter design of the proposed method are introduced,and the effectiveness of the voltage balancing method is verified by experiment.The proposed method retains the strong expansibility of the active clamping circuit,which is an auxiliary circuit independent of the original gate driver.Moreover,there are no programmed logical chips or additional signal isolation in the control circuit.

关 键 词：碳化硅金属-氧化物半导体场效应晶体管 串联 有源箝位 均压控制 

分 类 号：TM464[电气工程—电器]