Linear current module adaptive to wide operating voltage range based on automatic series/parallel conversion

Abstract

A new method based on adaptive series/parallel conversion to realize linear current output in a wide operating voltage range is presented in this paper. According to the load state, a switch array is employed to perform adaptive series/parallel conversion control on load segments and corresponding constant current branches to ensure constant current in each load segment and constant power of the total load in wide operating voltage range. The proposed design combines the advantages of switch mode current source and linear constant current source. The correctness and feasibility of the proposed method are verified by experiments of a LED driver.