【摘要】 为了抑制大功率绝缘栅双极型晶体管(IGBT)的关断电压尖峰,提出了一种有源门极控制方法及其优化方法。该控制方法采用电容反馈关断电压上升率来控制驱动电路,通过具备定时功能的高速高增益放大器降低反馈电容的容值,补偿集电极电流输出响应相对于有源门极控制信号的延时,并保证所提出的有源门极控制方法仅在IGBT关断过程中工作,提高了电路工作的可靠性。通过SABER仿真分析了关键参数对该方法抑制关断电压尖峰效果的影响,提出了一套品质因数评价体系,用于定量评估不同参数下的控制效果。风力发电变流器在极端工况下的实验结果表明,所提出的方法使用较小容值的反馈电容依然能够在仅有400 V电压裕量的严厉条件下降低电流下降速率,从而保证了IGBT的安全工作。更多还原

【Abstract】 In order to suppress the turn-off voltage in high-power IGBTs, we put forward an active gate control method and its optimization method. The control method uses the rise rate of turn-off voltage, which is sensed by a feedback capacitor, to control the driver circuit of IGBT. Using high-speed high-gain amplifiers with timing function, the feedback capacitance was reduced, and the delay between the collector current’s output responses and the control signal of active gate was compensated. In addition, on the basis of this amplifier, the proposed active gate control method works only during the turn-off process of IGBT, and it enhances reliability of working circuit. Furthermore, through simulations in SABER, we analyzed the influences of some key parameters in the control method on its effect of inhibiting turn-off voltage, meanwhile, an evaluation system of quality factor was proposed to quantitatively evaluate the control effect. The results of experiments under extreme conditions of wind power converters show that, using small feedback capacitors, the proposed method can slow down the current fall-rate with a voltage margin of only 400 V, and guarantee the safe operation of IGBT.更多还原