In this paper, we deal with the operational processing principle of the AT Forward MRC, which can reduce the resonant voltage stress up to 2 ～3 times the input voltage using two input capacitors and two multi-resonant switches in series. The eight equivalent circuits are found out in this converter during a switching period. The operational principle of the resonant converter is verified through the characteristics of the experimental converter with 48V input voltage, 5V/50W output voltage/power and PSpice simulation. The measured maximum voltage stress is 170V of 2.9 times the input voltage and the maximum efficiency is measured up to 81.66%.
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