| Title |
A Study on Full Bridge and Half Bridge Mode Transition Method of LLC Resonant Converter for Wide Input and Output Voltage Condition |
| Authors |
Min-Yeong Choe ; Seung-Woo Baek ; Hag-Wone Kim ; Kwan-Yuhl Cho ; Jeong-Won Kang |
| DOI |
https://doi.org/10.6113/TKPE.2022.27.4.356 |
| Keywords |
Full bridge LLC resonant converter; Wide voltage gain range; Mode transition; Frequency compensation |
| Abstract |
This paper presents a mode transition method that applies frequency compensation technique of an LLC resonant converter for stable mode transition. LLC resonant converters used in various applications require high efficiency and high power density. However, because of circuit property, a wider voltage gain range equates to a greater circuit loss, so maintaining high efficiency at all voltage gain ranges is difficult. In this case, full bridge-half bridge mode transition method can be used, which maintains high efficiency even in a wide voltage gain range. However, this method causes damage to the circuit through overcurrent by the mode transition. This study analyzes the cause of the problem and proposes a mode transition method that applies frequency compensation technique to solve the problem. The proposed method verifies the stable transition through simulation analysis and experimental results. |