Parameter design of voltage balancing circuit for series connected HV-IGBTs
Parameter design of voltage balancing circuit for series connected HV-IGBTs
复制标题
串联HV-IGBT电压平衡电路参数设计
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
Liqiang Yuan
中科院分区：
文献类型：
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作者：
T. Lu;Zhengming Zhao;Shiqi Ji;Hualong Yu;Liqiang Yuan
采用功率半导体器件串联是提高电力电子变换器额定电压和额定功率的直接有效方案。器件串联的关键问题是静态开关状态和动态开关状态下的电压平衡。有源箝位电路对绝缘栅双极型晶体管（IGBT）上的过电压进行采样，并向栅极注入电流，从而提高栅极电压，有效抑制过电压。本文提出了一种高压IGBT（HV-IGBT）串联均压电路。该电压平衡电路由静态集电极-发射极间电压平衡子电路、动态集电极-发射极间电压平衡子电路和有源集电极-栅极间箝位子电路组成。然后描述了这三个子电路的功能和原理。除拓扑结构外，电压平衡电路的参数也对串联高压IGBT的电压平衡产生重要影响。在定量分析高压IGBT参数、均压电路参数与串联器件均压指标之间关系的基础上，提出了一种高压IGBT均压电路的参数设计方法。该参数设计方法综合考虑了HV-IGBT的开关损耗、电压平衡电路的损耗、HV-IGBT的电应力和开关频率等因素，以保证系统的效率、可靠性和性能。将所提出的参数设计方法应用于Infineon 6500 V/600 A高压IGBT串联电路的开发过程中。实验结果表明, 改进后系统的稳态性能大幅度提高, 验证了方法的正确性和可行性。
Applying power semiconductor devices in series connection is a direct and effective scheme to improve the voltage rating and power rating of power electronic converter. The key issue of device series connection is voltage balancing in static switching state and dynamic switching state. Active clamping circuit samples overvoltage on insulated gate bipolar transistor (IGBT), injects current into the gate and thus could increase the gate voltage and suppress the overvoltage effectively. In this paper, a voltage balancing circuit for high voltage IGBT (HV-IGBT) series connection is presented. The voltage balancing circuit is composed of static state voltage balancing sub-circuit across collector and emitter, dynamic state voltage balancing sub-circuit across collector and emitter and active clamping sub-circuit across collector and gate. The functions and principles of the three sub-circuits are then described. Besides the topology, the parameters of the voltage balancing circuit influence the voltage balance of series connected HV-IGBTs seriously. Based on quantitatively analyzing the relationships among the parameters of HV-IGBTs, the parameters of voltage balancing circuit and the voltage balancing indexes of the series connected devices, a parameter design method for the presented voltage balancing circuit is proposed. This parameter design method comprehensively considers the switching loss of HV-IGBT, the loss of voltage balancing circuit, the electrical stress on HV-IGBT and the switching frequency in order to guarantee the efficiency, reliability and performance of the system. The proposed parameter design method is applied to the development process of a series connection circuit with Infineon 6500V/600A HV-IGBTs. Experimental results verify the validity and feasibility of the proposed method.