IMPROVED BUCK-BOOST CONVERTER WITH RESONANT SOFT SWITCH

Rong Desheng; Ma Dengxun; Sun Xuanjin

doi:10.19912/j.0254-0096.tynxb.2024-1422

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (12) : 216-224. DOI: 10.19912/j.0254-0096.tynxb.2024-1422

IMPROVED BUCK-BOOST CONVERTER WITH RESONANT SOFT SWITCH

Rong Desheng, Ma Dengxun, Sun Xuanjin

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Abstract

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

Key words

DC-DC converter / high gain / coupled inductance / active clamp / resonance / soft switch

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Rong Desheng, Ma Dengxun, Sun Xuanjin. IMPROVED BUCK-BOOST CONVERTER WITH RESONANT SOFT SWITCH[J]. Acta Energiae Solaris Sinica. 2025, 46(12): 216-224 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1422

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