Stabilizing Effects of Load Subsystem in Multistage DC-to-DC Power Conversion Systems

This paper investigates the impacts of the load subsystem on stability and performance of the upstream converter in multistage Dc-to-Dc power conversion systems. This paper demonstrates that an appropriate load subsystem can be constructed to provide both stability and intended performance for the upstream converter at the brink of instability before being coupled with the load subsystem. These 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. This paper also presents the design procedures for the stabilizing load subsystem, along with the performance verification of the upstream boost converter and the downstream buck converter.