Stabilizing effects of load subsystem in multi-stage dc-to-dc power conversion systems

This paper investigates the impacts of the load subsystem on stability and performance of the upstream converter in multi-stage dc-to-dc power conversion systems. The paper demonstrates that an appropriate load subsystem could offer both stability and predictable performance for the upstream converter that was at the brink of instability before being coupled with the load subsystem. This stabilizing effects of the load subsystem are theoretically analyzed and experimentally validated using a two-stage power conversion system, consisting of an upstream boost converter, downstream buck converter, and two filter stages. The results of this paper can be used to stabilize the upstream converter that was initially well designed but later became destabilized due to the detrimental interaction stemming from unknown source subsystems.