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.
Highlights
With the development of power electronics technology, switch power supply has widely emerged in fields of computer, industry and communication
Current-sharing control is necessary for parallel power system
Take the minimum output current as reference, every power module but the module with minimum output will reduce its current which results in current decrement of all current modules being greater than the current increment
Summary
With the development of power electronics technology, switch power supply has widely emerged in fields of computer, industry and communication. In this case, power modules with good external characteristics may sustain more current or even result in overload which greatly reduces their service lives. Current-sharing control is necessary for parallel power system. It guarantees current balance and reasonable allocation between parallel power modules and prevent certain modules from overload. After reviewing several common parallel current-sharing control strategies, a novel strategy is proposed. It selects the maximum and minimum output switch power supply modules with extremum current selection circuit and regulates the current through them.
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