Flyback Converter Balancing Technique for Lithium Based Batteries

In This paper, the concept of flyback converter cell balancing method for lithium based batteries in ultralight Electrical Vehicle (EV) is investigated. In electrical vehicles, Battery Management System (BMS) plays and important role, in order to achieve a reasonable life time and best performance. A cell balancing circuit is essential to equalize each battery cell as the same voltage level in a series battery cells. Among cell balancing method, flyback converter balancing method has fast balancing time. It has N secondaries for N cells. It only requires one switch and N diodes at the output for each cell. Therefore, the number of active switches are reduced, resulting in less losses and more efficient. In this paper, eight cells are investigated to be equalized. The primary is supplied by the total battery pack, which is controlled by N-channel MOSFET. The switch will be turn ON and OFF with 50% duty cycle. The simulation results are performed to testify the variability of the proposed system.

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