The lithium-ion battery equalizer based on switched inductor is still of strong practical value in low-power portable electrical equipment. However,the switching devices in the equalizer operate in a hard-switching state under traditional control strategies. A soft-switching implementation algorithm for battery equalizer based on switched inductor in continuous current mode is proposed. The determinants of the inductor current of the equalizer and the charging and discharging current of a battery cell are analyzed. Then,a soft-switching implementation algorithm for the switching devices in the equalizer is proposed,and its control accuracy is analyzed. The equivalent impedance and open-circuit voltage of the battery cell can be obtained in real time by detecting the change rate of battery cell voltage and charging current,which further ensures the accuracy of the algorithm. Experimental results show that the proposed soft-switching control algorithm has a good performance.
关键词
锂离子电池/均衡器/开关电感/电流连续模式/软开关算法
Key words
Lithium-ion battery/equalizer/switched inductor/continuous current mode(CCM)/soft-switching algorithm
维普
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