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元器件交易网讯 3月6日消息，外媒科技网站BusinessInsider报道，美国乔治亚理工学院工程师王中林(Zhong Lin Wang)研发出一种新型充电设备—当你走路时，这种设备可利用你身体的运动为你的电子产品充电。
该充电设备由四片叠加的圆盘组成。第一片是铜制圆盘，不停的旋转。下一层是聚合物，并且保持静止，第三层是金制圆盘，被分割成了几块，部分被剪掉了，看起来像一个自行车轮。最后一层是用塑胶做的。
王中林称只要第一层铜制圆盘在旋转，这款设备就能产生电量。例如，他在实验室演示了怎样用流动的水使这款产品工作。他也尝试过做成可穿戴的版本。“那将是更盛行的，”他对美国科技网站LiveScience说，“你能把它贴在腿上或者别在夹克上。”
这款充电设备4英寸大小，利用手臂摆动产生的电能可以驱动一个小灯泡，或产生5V电压，为一部iPhone充电足够了。有关它的更详细报道刊发在了3月4日的《自然通讯》杂志上。（元器件交易网刘光明 译）
外媒原文如下：
New Device Charges Your Phone As You Walk
Power cords and batteries are the bane of every gadget: You either carry around the necessary cords and cables, or you hope the battery lasts. But now, researchers want to change that, by building a charger powered by the motion of your body as you walk.
The device — built by Georgia Tech researchers, led by Zhong Lin Wang — consists of four discs layered on top of one another. The first disc is made of copper, and rotates.
The next is a polymer and remains stationary, and the third is a gold layer that is divided into sectors, with alternating sections cut out, to make something that looks like a bicycle wheel. The last layer is made of acrylic.
When the copper disc rotates, positive charges in the copper move past the negative charges in the polymer. That causes an imbalance of charges in the gold layer, with each "spoke" of gold having either more positive or more negative charges. This imbalance means that when a wire is connected between sectors, a current flows. [What"s That? Your Physics Questions Answered]
Wang said the device can generate power as long as something causes the copper disc to rotate. For example, he demonstrated that flowing water could work, in the lab.
He has also experimented with wearable versions. "This is even more general," he told Live Science. "You could attach it to your leg, or in the folds of a jacket."
The device works on the same principle as static electricity. For example, when you walk on a rug in wool socks, electrons build up in the socks (and in you), and when you touch a metal doorknob, they jump from your finger, making a spark. There"s a lot of voltage in the spark — enough to make the jump through the air — but not much current, which is why the shock doesn"t kill you.
"The phenomenon has been known for 1,000 years," Wang said. "But it"s rarely been utilized for power."
Wang said that his device is more efficient than a traditional generator, at least for its size. A generator works by moving either a wire through amagnetic field or a magnetic field over a stationary wire. Either one requires a certain number of turns of wire to make a certain voltage, plus a strong magnet. Those components take up space, which is why generators tend to be rather bulky — even a small one that could power a phone would be the size of a brick, and it would need a power source to boot.
But the device the researchers created can be made thin and flat; the one Wang demonstrated is about 4 inches (10 centimeters) across, and swinging it in the hand generated enough electricity to power a small array of lights, or about 5 volts, which is enough to charge an iPhone.
Wang said the device is 50 times more efficient than a traditional generator of the same size.
The device is detailed in the March 4 issue of the journal Nature Communications.
