Based On The Maximum Current Of The Dc / Dc Converter In Parallel System

The application of the paralleled DC/DC converter system is a good way to enhance the power level of the DC/DC converter. How to archive the current sharing between the paralleled converters is the key technology. At present most current sharing are archived in the condition that the differences of the converters are not very large. The performances of the paralleled DC/DC converter system are seldom discussed when the differences of the paralleled modules are large.This paper analyzes the principle of the current sharing using the small signal analysis based on the state-space average model and discusses the stability of the paralleled DC/DC converter system. Then a novel three-loop current sharing scheme with current limiting function is presented aiming at the limitation of the former current sharing schemes. In order to verify the feasibility of the scheme, a stimulation platform in MATLAB is built and the stimulation is made to test the performance of the paralleled DC/DC converter system on it. Finally an experimental platform is built to test the steady and transient performance of the paralleled DC/DC converter system. The result of the experiment is satisfying. The novel current sharing scheme is proved to be workable.