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Single-Magnetic Cell-to-Cell Charge Equalization Converter With Reduced Number of Transformer Windings

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5 Author(s)
Sang-Hyun Park ; Dept. of Electr. Eng., Korea Adv. Inst. of Sci. & Technol., Daejeon, South Korea ; Ki-Bum Park ; Hyoung-Suk Kim ; Gun-Woo Moon
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In this paper, a new cell-to-cell charge equalization converter using a multiwinding transformer is proposed. The proposed scheme achieves the direct cell-to-cell charge transportation by buck-boost and flyback operation. In this operation, the adjacent two cells share either a current path or a tap of multiwinding transformer. Therefore, the number of windings ia cut in half in comparison to the number of batteries, resulting in a small circuit size. To verify the operation of the proposed charge equalization converter, an experiment with a lithium-ion battery stack is performed.

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Power Electronics, IEEE Transactions on  (Volume:27 ,  Issue: 6 )