Single-Inductor Dual-Output Buck-Boost Power Factor Correction Converter

In this paper a single-inductor dual-output (SIDO) buck-boost PFC converter operating in critical conduction mode (CRM) is proposed. By multiplexing a single inductor, each output of SIDO buck-boost converter can be regulated independently. Compared with conventional two-stage multiple output converter, SIDO buck-boost PFC converter benefits from significant overall cost saving, small size and light weight. Moreover, the efficiency of SIDO buck-boost PFC converter can be improved due to single-stage power conversion. Control strategy and characteristics of the proposed converter are analyzed. The efficiency, power factor, total harmonic distortion (THD) and output accuracy are verified experimental results.