Droop methods for parallel co-working of DC/DC converters

Abstract

The paper deals with issue of parallel connection of more DC/DC converters. The article contains theoretical overview of one group of methods designed for proper functioning of parallel connected converters. The main advantage of referred methods is their simplicity. In some cases they fully satisfy requirements and they can be used for correct functioning of parallel power stages. Following part is dedicated to analysis of the one method by computer simulations. Analyzed method with current feedback has proved to be operational. Current-sharing can be ensured if current reference value is set at correct value for certain load. The results of the simulation showed that for 5Ω load and 20V of required output voltage is the 1A of reference current value just right. But when output resistive is increased, reference current value should be set more tightly (at the lower value). However then it can cause fall of the output voltage. It is why the droop methods increase current-sharing abilities, but makes worse output voltage regulation.