充电机功率切换模块内IGBT关断尖峰电压抑制

Suppression of IGBT Switching off Peak Voltage in Power Switching Module of Charger

针对直流充电机内功率切换模块中IGBT关断时产生的尖峰电压问题,本文对IGBT尖峰电压产生机理进行了详细的分析,在此基础上提出了一种通过在IGBT栅极和射极间并联电容降低集电极电流变化速率来抑制尖峰电压的设计方案,并对该方案进行仿真及实验。结果表明,该方案能有效抑制IGBT尖峰电压产生,防止IGBT过电压损坏,提高了直流充电机的可靠性。

Aiming at the peak voltage problem caused by IGBT switching off in the power switching module of the DC charger, this paper analyzes the mechanism of the IGBT peak voltage. On this basis, a design scheme is proposed to suppress peak voltage by reducing the rate of collector current by paralleling capacitance between the IGBT gate and emitter. The simulation and experiment of the proposed scheme are also carried out. The results show that the scheme can effectively suppress the occurrence of IGBT peak voltage, prevent the damage of IGBT over-voltage, improve the reliability of DC charger.