Current Sharing Scheme Selection And Realization Research For Middle And Low Power Level Paralleled DC/DC Converters

When considering Power Electronics System Integration (PESI), we have to deal with parallel operation of the converters. This dissertation mainly focuses on some key issues in parallel operation of DC/DC modules. In low power level applications, the droop method is popular used. Based on the complexity, the cost, the modularity, the reliability, and the current-sharing performance etc. a detailed comparison on various current-sharing methods is presented in the dissertation. In the middle power level applications, active current-sharing method is dominated. Outer Loop Regulation plus Basic Average Program Method, as well as Outer Loop Regulation plus Automatic Master Method, are two well-selected methods for middle power level applications. In this dissertation, the small-signal model about these two methods is presented, analysis of current-sharing error and voltage regulation performances is also discussed. The simulation and experimental results verify the theoretical analysis. At last, large-signal stability analysis of paralleled DC/DC converters is briefly described.