Modified Design of Two-Switch Buck-Boost Converter to Improve Power Efficiency Using Fewer Conduction Components

초록

In this study, a modified design of a two-switch buck-boost (TSBB) converter is proposed to improve power efficiency using fewer conduction components, and the optimal power range is measured. The proposed TSBB converter operates in three topologies: buck, boost, and buck-boost, like the conventional TSBB converter. However, the proposed converter improves the power efficiency in the buck and buck-boost topologies by decreasing conduction loss using the diode in the switch-off section while maintaining the same number of semiconductors as that in the conventional TSBB converter. The power efficiency of the buck topology improves for the power range 10-80 W in the constant voltage (CV) and constant current (CC) modes; it increases on average by 0.75-1.36% and 0.83-2.27% in the CV and CC modes, respectively. The power efficiency of the buck-boost topology step-down improves for the 10-80 W in all modes. This increases the average by 0.73-0.99% and 3.33-4.75% in the CV and CC modes, respectively. The power efficiency of the buck-boost topology step-up increases on average by 1.65-2.00% for 10-80 W in the CV mode. In the CC mode, it increases by 2.17-2.77% on average for 10-50 W.

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