The Open Electrical & Electronic Engineering Journal

2014, 8 : 170-177
Published online 2014 December 31. DOI: 10.2174/1874129001408010170
Publisher ID: TOEEJ-8-170

A Novel Parallel Current-sharing Control Method of Switch Power Supply

Chao Wu , Bingjuan Lu and Yuwang Ge
Department of Electrical Engineering and Automation, Luoyang Institute of Science and Technology, Henan, China, 471023.

ABSTRACT

A novel parallel current-sharing control method of switch power supply is proposed, on the basis of a detailed analysis of several common parallel current-sharing control methods and recent related patents. Only the current of switch power modules with maximum and minimum output current will be regulated, which is selected by the extreme current selection circuit in this method. Four cases with different extremum situation are discussed, and in each case, principles and equations are given. Finally the current-sharing control of switch power supply parallel system is realized. Experimental results show that the current-sharing method is reasonable and effective.

Keywords:

Current-sharing control, extreme current selection circuit, switch power supply.