• IGBT抗扰多段式闭环驱动芯片设计

    Design of IGBT anti-interference multi-stage closed-loop driver chip

    • 针对高频高功率密度IGBT模块对驱动芯片的严苛要求,需解决开关速度提升带来的电磁干扰增强问题,并实现开关损耗与电气应力间的动态平衡,本文提出一种融合多段式闭环控制架构与多维抗干扰技术的高性能驱动芯片解决方案。该方案主要包括:多段式动态补偿优化控制技术,通过实时采集IGBT开关瞬态特征参数构建驱动电流多级调控模型,可将过冲电压从56 V降至18 V,电流过冲从45 A压缩至36 A;电磁敏感度抑制系统,在电源系统采用电源抑制比(Power Supply Rejection Ratio,PSRR)大于106 dB的带隙基准和PSRR>116 dB的运算放大器结构,电平转换模块采用可耐受100 V/ns dv/dt的新型高抗干扰架构,输入级集成截止频率为20 MHz的脉冲滤波电路;多重动态故障防护机制,通过实时监测VCE电压与驱动电压构建退饱和保护阈值,并结合宽范围欠压锁定电路实现微秒级快速响应。基于华虹宏力BCD180GE工艺完成芯片设计与制造,实验结果表明,系统最大充放电电流达2.27 A/2.57 A,关键指标电磁干扰抑制比(Electromagnetic Interference Rejection Ratio, EMIRR)大于97 dB,综合性能全面优于传统开环驱动方案。

       

      Abstract: In response to the stringent requirements of high-frequency, high-power-density IGBT modules for driver chips, it is essential to mitigate electromagnetic interference exacerbated by increased switching speeds and achieve dynamic balance between switching losses and electrical stress. This paper proposes a high-performance driver chip solution that integrates a multi-stage closed-loop control architecture with multi-dimensional anti-interference techniques. The solution comprises: a multi-stage dynamic compensation optimization control technology, which constructs a multi-level drive current regulation model by real-time acquisition of IGBT switching transient characteristic parameters, reducing voltage overshoot from 56V to 18V and current overshoot from 45A to 36A; an electromagnetic susceptibility suppression system, employing a power supply rejection ratio (PSRR) >106 dB bandgap reference and PSRR >116 dB operational amplifier in the power system, a level-shifting module with a novel high dv/dt tolerance architecture capable of withstanding 100 V/ns, and an input stage integrating a pulse filter with a 20 MHz cut-off frequency; and multiple dynamic fault protection mechanisms, which establish a desaturation protection threshold by real-time monitoring of VCE and drive voltages, coupled with a wide-range undervoltage lockout circuit enabling microsecond-level rapid response. Fabricated in Hua Hong Hongli’s BCD180GE process, experimental results show that the system achieves maximum charge and discharge currents of 2.27A/2.57A, and a key figure of merit—electromagnetic interference rejection ratio (EMIRR)—exceeds 97 dB, comprehensively outperforming conventional open-loop drive schemes.

       

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