A Low-Cost Voltage Equalizer Based on Wireless Power Transfer and a Voltage Multiplier

作者：Fu, Minfan; Zhao, Chen; Song, Jibin; Ma, Chengbin^*

来源：IEEE Transactions on Industrial Electronics, 2018, 65(7): 5487-5496.

DOI：10.1109/TIE.2017.2777403

• Class E power amplifier (PA)
• low cost
• robust design
• single switch
• voltage equalizer
• voltage multiplier (VM)
• wireless power transfer (WPT)

This paper develops a novel voltage equalizer by combining wireless power transfer (WPT) and a voltage multiplier (VM) for series-connected energy storage cells. The physical isolation achieved by WPT can offer several unique benefits that traditional equalizers can hardly provide. In this paper, the characteristics of a multiple-output VM are analytically discussed and used to develop an equivalent one-output VM model. Based on this model, parameters of the WPT system are properly designed. The proposed design methodology can achieve a single-switch voltage equalizer without feedback control, which dramatically decreases the circuit complexity and cost. Moreover, this methodology can naturally ensure a robust system under small coil misalignment. In the experiment, the proposed system is built to balance four series-connected ultracapacitor modules. The system efficiency is 72.8% at a load power level of 10 W.

• 出版日期2018-7
• 单位上海交通大学