Modified High-Efficiency LLC Converters With Two Split Resonant Branches for Wide Input-Voltage Range Applications
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所属单位：自动化学院
发表刊物：IEEE TRANSACTIONS ON POWER ELECTRONICS
关键字：DC-DC converter LLC converter two transformer wide voltage range
摘要：This paper proposes a novel modified LLC converter with two split resonant branches for wide input-range applications. It can operate in low-gain (LG) mode or medium-gain (MG) mode. The voltage gain of MG mode is 1.5 times that of LG mode, while they have same range of voltage gain M-tank_range, i.e., the ratio of maximum voltage gain to minimum one. Therefore, the input voltage can be regulated in a wide range by operating the converter in different modes. To achieve the transition between modes, the required Mtank range of the proposed converter is as low as 1.5, resulting in lower magnetizing current and higher efficiency within the entire operation range. Smooth transition can be achieved by adjusting the duty cycles of switches gradually. The proposed LLC converter with primary dual-bridge is analyzed in detail as an example. To verify the theoretical analysis and performance of proposed solution, a 1-kW 400-V output prototype with input voltage ranging from 80 to 200 V is built, tested, and compared with two existing full-bridge LLC converters. Analysis and experimental results indicate that smaller volume of transformers, reduced rectifying diodes, and higher overall efficiency are achieved with the proposed converter.
ISSN号：0885-8993
是否译文：否
发表时间：2018-09-01
合写作者：Sun, Wenjin,吴红飞,丁婕
通讯作者：邢岩,吴红飞