INTELLIGENT PORTABLE BATTERY CHARGER FOR E-BIKES: ONLINE OPTIMIZATION OF THE BATTERY CHARGING EFFICIENCY

最近，电动自行车很受欢迎，因为它们提供了几个好处，如方便骑手和没有二氧化碳排放到我们的环境。然而，电动自行车成本高、电池续航时间短似乎是阻碍其在市场上广泛普及的最大障碍。为了降低成本，我们的工业合作伙伴Alizeti成功开发了一种解决方案，将大多数现有自行车转换为功能齐全的电动自行车。在该解决方案中，动力系统基本上基于与轮胎接触的电动滚筒，该电动滚筒通过摩擦力驱动自行车。电池和传动系统内置于紧凑的外壳中，固定在传统的后部行李架上。由于这种简单的配置，theriders可以很容易地转换成一个功能齐全的电动自行车在低成本。为了提高电池组的使用寿命，本项目将完成智能便携式电池充电器的开发。Alizeti电动自行车的电池组是由锂离子电池制成的24V/11.6Ah电池组。所开发的智能便携式充电器将具有两个主要的优点。首先，在充电过程中，电池组的阻抗将保持在其最小值，以显著提高充电效率和电池的寿命。这将导致经济的车手谁将不必支付频繁的电池组更换和维护。第二个特点是电池组可以从交流和直流电源充电，电压范围很大，直流电源从12 V到48 V，交流电源从95 Vrms到265 Vrms。有了这个功能，开发的充电器可以从所有流行的可用电源充电的电动自行车电池。因此，车手将使用他们的自行车更有效和舒适。此外，开发的充电器的大小和重量与流行的上网本充电器相似。有了这些有利的功能，电动自行车可以很容易地充电与智能的方式。因此，该项目的完成将通过为用户提供低成本但功能强大的电动自行车，为电动自行车在道路上的广泛传播做出重大贡献。

Recently, e-bikes have been popular because they offer several benefits such as the convenience for riders andno carbon dioxide emission to our environment. However, the high cost and the short duration of battery packseem to be the biggest drawbacks that prevent e-bikes from widely spreading on the market. In order to reducethe cost, Alizeti, our industrial partner, has successfully developed a solution to convert most existing bicyclesinto a full featured e-bikes. In this solution, the powertrain system is basically based on an electric-poweredroller in contact with the tire which drives the bike by friction. The battery and the drive train are built into acompact enclosure to be fixed on a conventional rear luggage rack. Thanks to this simple configuration, theriders can easily convert their bike into a full featured e-bike at low cost. In order to improve the lifetime of thebattery pack, this project will complete the development of an intelligent portable battery charger. The batterypack of Alizeti's e-bike is a 24V/11.6Ah pack made from Li-Ion battery cells. The developed intelligentportable charger will perform with two main advantageous features. Firstly, the impedance of the battery packwill be maintained at its minimum value during the charging process in order to improve significantly thecharging efficiency and the lifetime of the battery. This will result in economy for the riders who will not haveto pay for frequent battery pack replacement and maintenance. The second feature is that the battery pack canbe charged from both AC and DC power sources with a large voltage range, going from 12V to 48V in case ofDC power supply and from 95Vrms to 265Vrms in case of AC power supply. With this feature, the developedcharger can charge the e-bike battery from all popular available power sources. As a result riders will use theire-bikes more effectively and comfortably. In addition, the developed charger has a size and weight similar tothe popular netbook chargers. With these advantageous features, e-bikes can be charged easily with anintelligent manner. Hence, the completion of this project will significantly contribute to widely spread thee-bike on the road by offering users a low-cost but powerful e-bike.