Stochastic Power Loss Analysis of Differential Power Processing

Abstract

This article presents stochastic power loss analysis for differential power processing (DPP). A stochastic model is developed to analyze power loss scaling in a DPP system based on probability distributions of loads or sources. Scaling factors are introduced to describe how losses change with DPP system size and load or source power variance. Expected power losses of representative DPP topologies are analyzed and compared to losses of a conventional dc–dc converter with the same total switch die area and magnetic volume. The results quantify performance trends of DPP architectures. Models and scaling factors are verified with SPICE simulations and experimental results. The analytical framework, scaling factors, and quantitative models provide useful guidelines for designing large-scale DPP systems. This article is accompanied by a video file demonstrating the modeling procedures and the experimental setup.