一个多世纪过去了,无线电能传输技术已取得了一些进展。一百多家公司正在研究这项技术,其中既有WiTricity和ProxybyPower等新创公司,又有丰田(Toyota)、英特尔(Intel)、三星(Samsung)和富士康(Foxconn)等跨国企业。目前的挑战在于:按照功率方程原理,让电能从通过电缆传输变成通过磁场传输。
When in the atmosphere, electricity exists as a magnetic field. The trick is to capture it safely to recharge devices. Today's electric toothbrushes charge wirelessly -- as power is transmitted through a magnetic field from the charger to the brush. You can already buy wireless recharging pads: Place your cellphone on a pad that's plugged into the wall, and it will recharge. These pads, however, have their limitations -- the cellphone has to be in the right position, and it can take a long time. A New Zealand company called PowerbyProxy has demonstrated a system where you can put multiple cellphones on a pad in any position, and it will charge the devices as fast as a traditional charger. Samsung last month invested $4 million in the company.
电能在空气中传播时会转变为电磁场。所以我们可以非常安全地给手机等设备无线充电。现在普遍使用的无线充电式电动牙刷就是这个原理——电能通过磁场从电源传输给牙刷。市面上还有不少无线充电板,只要接通电源,再把手机放到上面就能无线充电。不过这种充电板有不少缺点:手机必须放得恰到好处,而且充电时间也很长。新西兰一家叫PowerbyProxy的公司发明了一套新系统,用户可以同时把多部手机摆放在充电板上的任何位置,充电速度很快,时间与传统方式相当。三星公司上个月宣布向PowerbyProxy投资400万美元。
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