Abstract：DC-DC converter has two basic types, including the regulated DC-DC converter and the unregulated DC-DC transformer. LLC resonant converter is a kind of practical soft-switching DC-DC converter, with the research focusing on the regulated form named regulated LLC resonant DC-DC converter. In order to increase the practical topology of soft-switching and high-efficiency DC-DC transformer, the unregulated form of LLC resonant DC-DC converter named LLC resonant DC-DC transformer is studied in this paper. The design method is proposed by the gain curve analyze of LLC resonant DC-DC transformer, and the load characteristics of gain and efficiency of the DC-DC transformer is analyzed specializing for optimal design. Finally, a LLC resonant DC-DC transformer protype is designed and bulit up. The experimental results verify the correctness and validity of this design method and the load characteristics analysis.
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2012, Vol. 27 
