[논문]Cell Balancing Method in Flyback Converter without Cell Selection Switch of Multi-Winding Transformer

Kim, Jin-Woong; Ha, Jung-Ik

doi:10.5370/jeet.2016.11.2.367

Cell Balancing Method in Flyback Converter without Cell Selection Switch of Multi-Winding Transformer 원문보기

Journal of electrical engineering & technology, v.11 no.2, 2016년, pp.367 - 376

Kim, Jin-Woong (Dept. of Electrical and Computer Engineering, Seoul National University) , Ha, Jung-Ik (Dept. of Electrical and Computer Engineering, Seoul National University)

Abstract ▼ AI-Helper

This paper presents a cell balancing method for a single switch flyback converter with a multi-winding transformer. The conventional method using a flyback converter with a multi-winding transformer is simple and easy to control, but the voltage of each secondary winding coil might be non-uniform because of the unequal effective turn-ratio. In particular, it is difficult to control the non-uniform effect using turn-ratios because secondary coil has a limited number of turns. The non-uniform secondary voltages disturb the cell balancing procedure and induce an unbalance in cell voltages. Individual cell control by adding a switch for each cell can reduce the undesirable effect. However, the circuit becomes bulky, resulting in additional loss. The proposed method here uses the conventional flyback converter with an adjustment made to the output filters of the cells, instead of the additional switch. The magnitude of voltage applied to a particular cell can be reduced or increased according to the adjusted filter and the selected switching frequency. An analysis of the conventional converter configuration and the filter design method reveals the possibility of adequate cell balancing control without any additional switch on the secondary side.

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가설 설정

As shown in Fig. 12(a) the voltage of the target cell is higher than that of the comparison cell at normal switching frequency. However, at the switching frequency selected for the band attenuation, the difference in the cell voltage is reduced by 60% as shown in Fig.

제안 방법

In the case of an unbalanced cell, it only needs to start switching at a certain frequency. However, the proposed method should consider the specific cells affected by the non-uniform turn-ratios. First, the voltage of each cell is sensed continuously to enable the detection of the unbalanced cell.
The proposed topology uses a flyback converter with a multi-winding transformer for simplicity. Simultaneously, non-uniform turn-ratios in multi-winding transformer are compensated, and the cell selective control can be done with the adjusted filter and switching frequency.
This paper proposed a cell balancing method using generalized filters and a single switch flyback converter with multi-winding transformer. A general LC or CL filter is used in each secondary winding, which is adjusted as a band amplification or attenuation type.
The wide range of the switching frequency can adversely affect the transformer core design. To reduce this negative effect, the proposed method can work not for all cells but for the cell with the winding which has the worst non-uniform turn- ratio. In addition, by grouping several windings that have similar properties, the number of the adjusted switching frequencies can be reduced.
To show the feasibility of the proposed method, a cell balancing of eight Li-Po batteries is executed using a single switch flyback converter with multi-winding transformer and adjusted filters. The turn-ratios of the adjusted windings are designed in two ways.

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Cell Balancing Method in Flyback Converter without Cell Selection Switch of Multi-Winding Transformer 원문보기

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Cell Balancing Method in Flyback Converter without Cell Selection Switch of Multi-Winding Transformer 원문보기

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