Title :
Design and implementation of a half-bridge dual LLC converter with symmetrical autotransformer
Author :
Ke-Ming Chen ; Tsorng-Juu Liang ; Shih-Ming Chen ; Shih-Wen Tsai
Author_Institution :
Dept. of Electr. Eng., Nat. Cheng-Kung Univ., Tainan, Taiwan
Abstract :
In this paper, a half-bridge dual LLC converter with symmetrical autotransformer is proposed. The advantages of the proposed converter are that the dual LLC resonant tanks and symmetrical autotransformer can reduce the current stress of components, achieve high efficiency, and increase step-down conversion ratio and high power density. All active switches are turned on at ZVS and rectifier diodes are turned off at ZCS with wide load conditions. The operating principle and steady-state analysis are proposed. To verify the analysis, a laboratory prototype dual LLC resonant converter with input voltage of 400V and output 24V/21A is implemented. The maximum efficiency of the proposed converter is 93.4%.
Keywords :
autotransformers; rectifiers; resonant power convertors; zero current switching; zero voltage switching; ZCS; ZVS; active switches; current 21 A; efficiency 93.4 percent; half-bridge dual LLC converter; high power density; load conditions; operating principle; rectifier diodes; resonant tanks; steady-state analysis; step-down conversion ratio; symmetrical autotransformer; voltage 24 V; voltage 400 V; Capacitors; Equations; Inductors; Magnetic resonance; Zero current switching; Zero voltage switching; LLC resonant converter; coupled-inductor; current doubler rectifier;
Conference_Titel :
Energy Conversion Congress and Exposition (ECCE), 2014 IEEE
Conference_Location :
Pittsburgh, PA
DOI :
10.1109/ECCE.2014.6954049