Implementation and study of constant-frequency llc resonant converter

Shi Yi Lin, Shih Kuen Changchien, Chien Ming Hong, Yi-Nung Chung

Research output: Chapter in Book/Report/Conference proceedingConference contribution


This chapter presents an LLC resonant converter with constant frequency. Since LLC resonant converters possess the advantages of high efficiency and low electromagnetic interference, they are widely used in many applications. However, the EMI filter design becomes more complex because of the variable-frequency operation of LLC resonant converter. Therefore, in this chapter, a circuit configuration of a buck converter cascade an LLC resonant converter, buck-fed LLC resonant converter, is proposed to complete constant-frequency operation and simplify the EMI filter design. The buck converter is applied in the proposed converter as the input source for the LLC resonant converter. In addition, by adjusting the output voltage of the buck converter, the output regulation and constant-frequency operation of the proposed converter can be achieved. Finally, a prototype of the buck-fed LLC resonant converter with input voltage 380-400 V and output 24 V/10 A is implemented. The experimental results demonstrate the feasibility of the proposed converter.

Original languageEnglish
Title of host publicationIntelligent Technologies and Engineering Systems
Number of pages11
Publication statusPublished - 2013 Aug 8
Event2012 1st International Conference on Intelligent Technologies and Engineering Systems, ICITES 2012 - Changhua, Taiwan
Duration: 2012 Dec 132012 Dec 15

Publication series

NameLecture Notes in Electrical Engineering
Volume234 LNEE
ISSN (Print)1876-1100
ISSN (Electronic)1876-1119


Other2012 1st International Conference on Intelligent Technologies and Engineering Systems, ICITES 2012

All Science Journal Classification (ASJC) codes

  • Industrial and Manufacturing Engineering

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