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Research on Dual-Operation Mode of 3-Level LLC Resonant Converter
A. Zhenwei Li,B. Lei Zhao,C. Yuan Liu,D. Haoyu Li 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
In order to meet the demands of high efficiency and a wide adaptable range of input voltage, a Dual- Operation Mode half-bridge LLC converter which can operate in two different modes according to the level of input voltage is obtained by adjusting the driving control strategy of 3-level LLC resonant converter, and the adaptable range of input voltage is doubled with the same parameters of resonant tank. The limiting factors on adaptable range of input voltage are defined by analyzing the voltage gain characteristic and power loss of LLC converter. After analyzing the Dual-Operation Mode of 3- level LLC converter and its influence on the adaptable range of input voltage, the driving control strategy is defined. The characteristic about wide input adaptability and high efficiency of the Dual-Operation Mode half-bridge LLC converter are verified through simulation and experiments.