Title :
A novel integrated AC choke for common-mode voltage suppression in power converter systems
Author :
Zhu, Ning ; Kang, Jinsong ; Xu, Dewei ; Wu, Bin ; Xiao, Yuan
Author_Institution :
Dept. of Elec. & Comp. Eng., Ryerson Univ., Toronto, ON, Canada
Abstract :
This paper presents a novel three-phase choke that integrates the common-mode (CM) suppression and differential-mode (DM) filtering functions. The proposed choke provides a transformerless solution to issues caused by the switching common-mode voltage (CMV) in power converter systems. The magnetic core involves three bridge legs and a peripheral part on which one set (three-phase) of coils are wound. While the induced CM flux flows in the circumference; the DM flux fills in both the external core and bridge legs through the air gaps. A high CM-to-DM inductance ratio is generated by the mechanical assembly. Despite novelty of the structure, a traditional design method based on magnetic circuit calculation is applicable to the integrated choke, in which not only is the size/weight minimized, but a reasonably small core loss is also achieved. Comparison to separate DM and CM reactors demonstrates the benefits of integration in iron and copper material saving, volume and weight reduction and efficiency improvement. The finite element analysis (FEA) simulation and test results of the prototype are finally supplied to verify the feasibility and effectiveness of the integrated choke.
Keywords :
air gaps; finite element analysis; magnetic cores; power convertors; power inductors; CM reactor; CM suppression; CM-to-DM inductance ratio; DM filtering functions; DM flux; DM reactor; FEA simulation; air gaps; common-mode voltage suppression; copper material saving; core loss; differential-mode filtering functions; finite element analysis; induced CM flux; integrated AC choke; iron material saving; magnetic circuit calculation; magnetic core; mechanical assembly; peripheral part; power converter systems; switching CMV; three-bridge legs; three-phase choke; Air gaps; Bridge circuits; Delta modulation; Inductance; Inductors; Magnetic cores; Magnetic flux; common-mode voltage (CMV); finite element analysis (FEA); integrated ac choke; power converter systems; transformerless;
Conference_Titel :
Electric Machines & Drives Conference (IEMDC), 2011 IEEE International
Conference_Location :
Niagara Falls, ON
Print_ISBN :
978-1-4577-0060-6
DOI :
10.1109/IEMDC.2011.5994742