The third harmonics current injection scheme for LLC topology to reduce the RMS of the output current

Author

Ren Ren ; Fanghua Zhang ; Zhiyuan Shen ; Shuo Liu

Author_Institution

Jiangsu Key Lab. of New Energy Generation & Power Conversion, Nanjing Univ. of Aeronaut. & Astronaut., Nanjing, China

fYear

2015

fDate

15-19 March 2015

Firstpage

1435

Lastpage

1439

Abstract

The Intermediate Bus Converter (IBC) is a middle stage converter in the distribution power architecture, characterized with high efficiency, high frequency and high power density, to realize the DC voltage transform and isolated function. In this paper, the unregulated LLC DC transformer´s (LLC-DCT) inherent problem which leads to a large conduction loss in IBC application has been discussed. A new intuitive topology with third order harmonic current injection has been proposed to reduce the RMS of the resonant and secondary current. At the end, the theoretical analysis and the proposed optimal topology design are verified by an 800W, 100kHz, 400V/12.5V LLC-DCT prototype.

Keywords

DC transformers; potential transformers; power conversion harmonics; IBC application; LLC topology; LLC-DCT prototype; distribution power architecture; frequency 100 kHz; intermediate bus converter; large conduction loss; middle stage converter; output current RMS reduction; power 800 W; third order harmonic current injection scheme; unregulated LLC DC voltage transformer; voltage 400 V to 12.5 V; Frequency conversion; Harmonic analysis; Impedance; Inductance; Resonant frequency; Switches; Topology; LLC-DCT; conduction loss; resonant converter; third harmonics current injection;

fLanguage

English

Publisher

ieee

Conference_Titel

Applied Power Electronics Conference and Exposition (APEC), 2015 IEEE

Conference_Location

Charlotte, NC

Type

conf

DOI

10.1109/APEC.2015.7104536

Filename

7104536