A Full Bridge Three Level LLC Multi Resonant Converter with Wide Input Voltage Range

In response to the small voltage gain range of traditional full bridge three-level LLC resonant converters, which cannot meet the wide voltage range application scenarios, this article adds resonant element Lp to the traditional full bridge three-level LLC resonant converter A novel parallel multi resonant converter composed of Cr and Cp is proposed, and a full bridge three-level LLC multi resonant converter is proposed. The gain characteristics of the topology circuit are analyzed, and it is found that the voltage gain range of the full bridge three-level LLC multi resonant converter is doubled under the same load, and it can achieve high voltage gain at both under resonant and over resonant operating frequencies. This study established an experimental machine with a power of 500 W, confirming the accuracy of the research results.