Design considerations and experimental evaluation for LLC resonant converter with wide battery voltage range

Author

Wenjin Sun ; Hongfei Wu ; Haibing Hu ; Yan Xing

Author_Institution

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

fYear

2014

fDate

Aug. 31 2014-Sept. 3 2014

Firstpage

1

Lastpage

6

Abstract

This paper illustrates design considerations and experimental evaluation for LLC resonant converter with wide battery voltage range based on the FHA (fundamental harmonic approximation) analysis. Different from the conventional LLC design at zero load, the ratio K of the transformer magnetizing inductor L_M to the resonant inductor L_R in this design is optimized with two charging points (V_o(min), I_o(max1)) and (V_o(max), I_o(max2)) according to the battery charging profile. A 2.9kW prototype is built to verify the design. And it converts 400V from the Boost PFC to an output voltage range of 36V to 72V dc, achieving a peak efficiency of 96 %.

Keywords

battery chargers; power conversion harmonics; resonant power convertors; FHA; LLC resonant converter; battery charging profile; boost PFC; fundamental harmonic approximation analysis; power 2.9 kW; resonant inductor; transformer magnetizing inductor; voltage 36 V to 72 V; voltage 400 V; Batteries; Capacitors; Inductors; Schottky diodes; Switching frequency; Video recording; Zero voltage switching;

fLanguage

English

Publisher

ieee

Conference_Titel

Transportation Electrification Asia-Pacific (ITEC Asia-Pacific), 2014 IEEE Conference and Expo

Conference_Location

Beijing

Print_ISBN

978-1-4799-4240-4

Type

conf

DOI

10.1109/ITEC-AP.2014.6940766

Filename

6940766