A variable frequency pulse charge for Li-ion battery

In this paper, a variable frequency pulse charge system (VFPCS), that can detect and dynamically track the optimal charge frequency, is proposed to improve the Li-ion battery charge response. To assess the system performance, a prototype of the VFPCS is implemented. In comparison with standard CC-CV charging system and conventional fixed-frequency pulse charge system, the charge time of the proposed VFPCS is improved about 25% and 10%, respectively. The results indicate that the VFPCS can actually provide pulse with optimal frequency to charge the battery and the charge response is improved as theory predicted.