A novel, low-cost implementation of "democratic" load-current sharing of paralleled converter modules

A simple, low-cost, and robust "democratic" (autonomous) current-sharing circuit is proposed and analyzed. The circuit maintains good current sharing among the modules by properly adjusting the voltage references of the modules based on the differences between the average current of the paralleled modules and the currents of the individual modules. Design guidelines for achieving a desired current-sharing performance are given and verified on a number of DC/DC power converter modules operating in parallel.