A New Phase Shift Full Bridge LLC Resonant Converter with Auxiliary Circuit

Li-Ting Chou, Electrical Engineering Department, National Yunlin University of Science and Technology, Yunlin, Taiwan, Chih-Chiang Hua
2019 International Journal of Electronics and Electrical Engineering  
A new Phase-Shift Full-Bridge LLC auxiliary circuit converter (PSFBLLC) controlled by phase-shift pulse width modulation and LLC resonance is proposed in this paper. The proposed converter integrates an LLC resonant circuit and an auxiliary circuit to transfer energy as well as to achieve zero voltage or zero current switching. The advantages include lower circulating current, less conduction loss and secondary side ringing, and less required components, thereby improving overall efficiency.
more » ... rall efficiency. The converter is of input voltage of 400V, frequency of 38kHz, output voltage of 48V, and output power of 850W. The efficiency of proposed converter at light load increases by 2.54% compared with the traditional LLC converter. The converter efficiency at half load is 97.73%, and the efficiency is up to 98.51% at full load.
doi:10.18178/ijeee.7.4.65-69 fatcat:mtltmxfxdjcb7f7i4urxwonzcm