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所属单位：自动化学院

发表刊物：IEEE TRANSACTIONS ON POWER ELECTRONICS

关键字：Battery chargers current ripple digital control frequency dither (FD) frequency modulation (FM) Li-ion batteries LLC resonant converter quantization resolution

摘要：The mechanism of current ripple propagation in a digital controlled LLC converter is investigated from three aspects: battery load, quantization error, and double line frequency perturbation at the input. With conventional frequency modulation (FM), every modulation step is accompanied by quantization error due to limited resolution of digital controllers. Large current ripple is propagated to the output due to poor FM and extremely low internal impedance of batteries, which hurts battery health seriously. The analytical model of output current oscillation is proposed considering the quantization effects and double line frequency input voltage perturbation. The synchronous frequency dither (FD) is proposed to improve quantization resolution and reduce current ripple further. A 2-kW Li-ion battery charger was built to verify the proposed current oscillation model and effectiveness of synchronous FD control. Good agreement is verified between analytical derivations and experimental results. The quantization current ripple is significantly attenuated by around 45% over entire charging range.

ISSN号：0885-8993

是否译文：否

发表时间：2018-02-01

合写作者：Wu, Ya-Qi,Gu, Dong-Jie,陈乾宏

通讯作者：张之梁