IGBT Pump-up Drive Technology to Improve Overload Capability of Traction Converters
Traction converter will operate under overload condition in the process of train starting and emergency braking.The IGBT current will exceed the rated current.Despite it still being within the allowable current range of the device,the IGBT loss will increase greatly,resulting in a large fluctuation in the temperature rise of the converter.In this paper,an IGBT drive circuit with integrated gate voltage boosting technology was studied,which can increase the gate turn-on voltage and reduce the turn-on voltage drop of the IGBT,in the case of the need to increase the IGBT cur-rent carrying capacity in a short period of time,thereby reducing the loss and temperature fluctuation of the IGBT.First-ly,the operating characteristics of the traction converter under overload conditions were analyzed,whereby the loss and temperature rise of the IGBT were calculated.Secondly,the influence of gate voltage rise on IGBT turn-on drop was ana-lyzed,and an IGBT drive circuit with gate voltage boosting function was designed.Finally,the effectiveness of this de-sign was verified through simulation and double-pulse experiments.
traction converterIGBT drive circuitgate voltage boosting technologyIGBT loss
万方数据
维普
