This paper proposes a high-gain coupled inductor Buck-Boost converter with resonant soft-switching to address the low voltage gain
high voltage stress
hard switching
and significant reverse recovery of diodes inherent in traditional DC-DC converters. The converter is realized by integrating the C-L-VD-C unit
active clamp branch
coupled inductor voltage-doubling unit
resonant capacitor
and output inductor into the Buck-Boost converter. High voltage gain can be achieved through the C-L-D-C unit and the coupled inductor voltage-doubling structure. A capacitor-inductor loop is established to achieve low output current ripple. The active clamp branch allows all switches to operate under zero-voltage switching (ZVS) conditions. Zero current turn-off of all diodes is realized through LC resonance
reducing losses caused by the reverse recovery characteristics of the diodes
and an extended structure of the converter is proposed. A detailed analysis of the converter’s performance is conducted
providing the critical conditions for achieving soft-switching. A 150 W prototype was built to verify the theoretical analysis results
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