Abstract
Two modified rectifications for improving the charge equalisation performance of series-connected battery stack are proposed in this study. Not only high reliability can be achieved because only one power switch is required, but also the control circuit is simple due to no voltage sensors. In addition, high efficiency can be achieved because of zero-voltage-switching. In this study, two modified rectifications are presented to eliminate the voltage differences between the odd and even batteries, which are not removed by the conventional methods, and reduce the number of transformer windings and diodes. Hence, the cost, size and complexity of the system can be reduced. The circuit topology and operation analysis of the proposed equaliser are described in detail. Finally, the simulations and experimental results are provided to demonstrate the performance of the proposed charge equaliser.
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