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Abstract
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A novel high-efficiency transformerless buck–boost DC–DC converter is proposed in this paper. The
presented converter voltage gain is higher than that of the conventional boost, buck–boost, CUK, SEPIC
and ZETA converters, and high voltage gain can be obtained with a suitable duty cycle. The voltage stress
across the power switch is low. Hence, the low on-state resistance of the power switch can be selected to
decrease conduction loss of the switch and improve efficiency. The input current ripple in the presented
converter is low. The principle of operation and the mathematical analyses of the proposed converter are
explained. The validity of the presented converter is verified by the simulation results in
PSCAD/EMTDC software and experimental results based on the prototype circuit with 250 W and
40 kHz.
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