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Abstract

This paper presents a high-efficiency and smooth transition buck-boost converter to extend the battery life of portable devices. The operation time of portable devices decreases significantly with their increasing functions. This problem could be solved by using a non-inverting buck-boost DC-DC converter. Therefore, over a wide input voltage range, the proposed buck-boost converter which has only two switches instead of four power switches is used, to reduce conduction and switching losses. Especially, the proposed buck-boost converter offers good line/load regulation and thus provides a smooth and stable output voltage when the battery voltage decreases. Simulation results show that the output voltage drops is very small during the whole battery life time and the output transition is very smooth during the mode transition by the proposed buck- boost control scheme.