Parallel DC/DC converters system considering output cable resistance

This paper investigated the effect of the output cable resistance to the stability of the parallel DC/DC converters system via primary droop current sharing controller. Firstly, the two-port equivalent network of the buck derived converter was modeled and then the control block diagram of the interconnection system with integrated controller was also built. Although the DC/DC converter with primary droop current sharing controller obtains a stable design, the parallel DC/DC converters system with respect to different cable resistances might be unstable. When the cable resistance is reduced, the phase margin of the interconnected system will reduce and even worst get to instability. Furthermore, the design procedures of the integrated controller and output voltage droop characteristic are provided. Finally, some simulation and experimental results demonstrated the findings in a prototype parallel DC/DC converters system.