Low frequency ripple propagation analysis in LLC resonant converter base on signal modulation-demodulation theory

Author

Chen, Xi ; Duan, Shanxu ; Cai, Wen ; Ma, Mengyin ; Chen, Changsong ; Chen, Yu

Author_Institution

College of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan, 430074, P. R. China

fYear

2013

fDate

28-31 May 2013

Firstpage

1

Lastpage

5

Abstract

Two stage AC-DC-DC converters are widely used in battery charge systems. While in the two stage AC-DC-DC converter system with a front-end single phase rectifier, the pulsating power which is the twice of the grid fundamental frequency will affect the DC bus voltage, which will eventually deteriorate the output voltage quality of the rear-end DC-DC converter. This paper analyzes the low frequency voltage ripple propagation in LLC DC-DC resonant converter based on signal modulation-demodulation theory. With this analytical method, the quantitative relationship between the amplitude of input and output low frequency voltage ripple is obtained. Quantitative expression obtained with the proposed analysis method is proved by experimental results with a 1kW LLC resonant converter.

Keywords

Batteries; Capacitors; Frequency conversion; Frequency modulation; Rectifiers; Resonant frequency; Switching frequency; LLC resonant converter; Low frequency ripple; Signal modulation-demodulation;

fLanguage

English

Publisher

ieee

Conference_Titel

Industrial Electronics (ISIE), 2013 IEEE International Symposium on

Conference_Location

Taipei, Taiwan

ISSN

2163-5137

Print_ISBN

978-1-4673-5194-2

Type

conf

DOI

10.1109/ISIE.2013.6563768

Filename

6563768