基于全碳化硅器件的辅助变流器设计及试验验证

Design and Test Verification of Auxiliary Converter Based on Full SiC MOSFET Device

辅助变流器是导轨电车上的重要电源设备,为全车提供380 V交流电和24 V直流电源。目前辅助变流器普遍采用基于IGBT(绝缘栅双极型晶体管)功率模块进行设计,其体积大、开关频率低、功率密度小,无法满足当前导轨电车辅助变流器小型化、轻量化的设计需求。采用新型SiC(碳化硅)MOSFET(金属-氧化物-半导体场效应晶体管)功率器件代替IGBT进行系统设计,以提高系统开关频率,优化设计外围无源器件,同时利用新型箝位电路抑制了高开关频率带来的尖峰电压。通过计算及试验,验证了基于SiC设计的新型导轨电车辅助变流器在体积和性能方面的优势,对SiC MOSFET器件的应用具有积极意义。

Auxiliary converter is an important power supply device providing 380 V AC and 24 V DC power for the guided vehicle.At present,auxiliary converters are usually designed with IGBT(insulated gate bipolar transistor)power modules,but the large volume,low switching frequency and low power density cannot meet the requirements of miniaturization and light weight for auxiliary converter installed on the guided vehicle.Therefore,a new SiC(silicon carbide)MOSFET(metal\|oxide\|semiconductor field\|effect transistor)power device is adopted in the design of auxiliary converters to replace IGBT,for the purpose of improving the system switching frequency,optimizing the design of peripheral passive components,and suppressing the spike voltage caused by high switching frequency with the new clamp circuit.Through calculation and test,the advantages of the new rail tram auxiliary converter based on SiC design in terms of volume and performance are verified,which has positive impact on the application of SiC MOSFET devices.