基于SiC器件ISOP移相全桥变换器整流振荡抑制

Rectifier Oscillation Suppression Based on SiC Device ISOP Phase-shift Full Bridge Converter

目前地铁车辆的辅助供电系统采用集中式供电方式,供电网电压等级提高至1500 V,由于目前全碳化硅(SiC)器件电压电流等级限制,所以采用输入串联输出并联(ISOP)的移相全桥(PSFB)拓扑来减小器件的电压应力,提高系统功率等级,但是SiC器件对于电路参数非常敏感,非常容易产生振荡,影响系统运行稳定性。分析了整流振荡产生的机理,对常规振荡抑制方法以及ISOP系统均压均流方法进行了阐述,并对此方法进行了仿真和实验验证,发现初级二极管箝位方法和次级RCD吸收方法都可以对整流振荡产生抑制,但是会严重影响效率。

The metro vehicle auxiliary power supply system adopts centralized power supply mode,supply network up to 1500 V voltage level,due to the all silicon carbide(SiC)device voltage current level is limited,so the input series output parallel(ISOP)phase-shift full bridge(PSFB)topology is adopted to reduce the voltage stress of the device,improve the level of system power,but SiC device for circuit parameters is very sensitive and very easy to generate oscillation,affect the system running stability.The commutation oscillation due to the principle of oscillation suppression of commonly used methods is analyzed and equalizing the ISOP system flow method are expounded,and the simulation and experimental validation of the method,it is found that the original diode clamping methods and deputy while RCD absorption method can produce inhibition to rectifying oscillation,but will seriously affect the efficiency.