A Novel Six-Element Multi-resonant DC-DC Converter for Wide Input Voltage Range Applications

A multi-element wide gain resonant converter with trap function is proposed in this paper. Compared with the conventional LLC converter, the converter proposed in this paper can maintain the output voltage stable in a wider input voltage range. Besides, the third harmonic is used to deliver power, improving efficiency of the converter. The operating principle, voltage gain characteristics and impedance characteristics of the converter is described and analyzed in detail, and the main circuit parameters is designed in the paper. The simulation results demonstrated that the wide voltage gain can be realized by the proposed converter. Meanwhile ZVS for the primary side switches and ZCS for the secondary side switches can be achieved, and great soft-start performance can be displayed.