Three-leg power converter topology for a battery charger

In this study, a three-leg power converter battery charger for the lithium-iron phosphate battery is proposed. The proposed power converter is configured by a three-leg power converter. The operating principle of the proposed three-leg power converter is based on the concept of the common mode and differential mode used in the analysis of the conducted electromagnetic interference. In the proposed battery charger, no transformer is required for matching the voltage levels between the utility with a higher AC voltage and the battery set with a lower DC voltage. Moreover, the unity input power factor can be obtained. A prototype is developed and tested to verify the performance of the proposed battery charger. The experimental results show the performance of the proposed power converter is as expected.