@article{Sang2026, 
author = {Xikun Sang and Yijie Wang and Shanshan Gao and Dianguo Xu},
title = {Partial-power LLC Resonant Converter with Integrated Transformer for Wide Input Range},
year = {2026},
journal = {CSEE Journal of Power and Energy Systems},
volume = {12},
number = {3},
pages = {1480-1490},
keywords = {DC transformer (DCX), high efficiency, LLC resonant converter, partial power, wide input voltage},
url = {https://www.sciopen.com/article/10.17775/CSEEJPES.2022.07930},
doi = {10.17775/CSEEJPES.2022.07930},
abstract = {LLC resonant converters are popular in high-frequency and high-power-density applications with the advantage of excellent soft switching characteristics. Nevertheless, voltage regulation capability is constrained, and additional power losses will be introduced in a wide operating range. A partial-power LLC resonant converter for a wide input range is presented in this article. Two LLC converters are both designed at the open-loop state, performing as a DC transformer (DCX) to realize a constant transformation ratio. System input power is divided into two parts by a series connection of the two DCXs, which is helpful to reduce component ratings. A synchronous Buck-Boost is cascaded with DCX2 to achieve system closed-loop control by pulse width modulation. Most system power is transmitted by DCX1, and a small portion is processed by DCX2, so less power loss will be generated by Buck-Boost. Working principle, parameters optimization, and integration design of magnetic components are introduced in detail in this paper. A 200W 280 V–400 V/48 V experimental prototype with 1-MHz is established to demonstrate the correctness of the theoretical analysis. Peak test efficiency is up to 95.8%, which is improved compared with the conventional two-stage scheme under the same working conditions.}
}