Approximate Analysis of Resonant LLC DC-DC Converter

Author

Ivensky, Gregory ; Bronshtein, Svetlana ; Abramovitz, Alexander

Author_Institution

Electr. & Comput. Eng. Dept., Ben Gurion Univ. in the Negev, Beer-Sheva, Israel

Volume

26

Issue

11

fYear

2011

Firstpage

3274

Lastpage

3284

Abstract

This paper presents an approximate analysis of LLC resonant converter with capacitive filter operating above and below resonance. An equivalent ac resistance model of the rectifier valid for discontinuous as well as continuous conduction modes is proposed. The dc voltage conversion ratio is then obtained using the fundamental harmonic approximation analysis method. Based on the analysis, LLC converter design plots and guidelines are suggested. The theory is verified by simulation and experiment.

Keywords

DC-DC power convertors; approximation theory; power filters; rectifying circuits; resonant power convertors; DC voltage conversion ratio; capacitive filter; continuous conduction modes; discontinuous conduction modes; equivalent AC resistance model; fundamental harmonic approximation analysis method; rectifier; resonant LLC DC-DC converter; Approximation methods; Converters; Harmonic analysis; Inductors; Power harmonic filters; Rectifiers; Resistance; DC-DC conversion; LLC; resonant circuits;

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/TPEL.2011.2142009

Filename

5749291