日本搞出奇妙充电屋，坐在任意位置都能隔空充电！研究登上Nature子刊
Japan has came up with a extremely wonderful charging house which can be charged from any podition! Research published in Nature sub-journal
可充手机笔记本台灯等
Can charge mobile phones, laptops, desk lamps, etc.
现在的无线手机充电好是好，但只能牢牢拴在充电板上充。
Though the current wireless mobile phone is great for charging, it can only be firmly tied to the charging board for charging.
有没有可能像无处不在的WIFI一样随时为我们的手机充电呢？
Therefore, whether there will be anything that is possible to charge our mobile phones at any time like WIFI everywhere?
东京大学和密歇根大学的研究人员发明了这样一个无线充电室，可以提供50W的传输功率，成功为屋内的手机、电台灯和小风扇充上了电。
Researchers from the University of Tokyo and the University of Michigan have already invented such a wireless charging house, which can deliver transmission power at a level of 50 watts,successfully charging mobile phones, desk lamps and small fans inside the room.
ps.注意台灯的插头就在地上，电风扇没有连接任何线路，手机上的那根线是连接收器用的。
PS.Note that the plug of the desk lamp is on the ground. The electric fan is not connected to any line, and the line on the mobile phone is used to connect the receiver.
研究成果发表在Nature Electronics。
The research findings were published in Nature Electronics.
50W传输功率的无线充电室
Wireless charging room with 50W Transmission Power
实现无线充电的方法有3种：电磁感应式、磁场共振和无线电波式。
There are three methods to realize wireless charging: electromagnetic induction, magnetic resonance and radio wave.
本研究采用的是磁场共振原理：发送和接收装置在一个特定的频率上共振，就可以交换彼此的能量。
This study adopts the principle of magnetic field resonance: the transmitting and receiving devices resonate at a specific frequency and can exchange energy.
该房间规模为3mx3mx2m，首先在外面配备一个输出频率为1.34MHz的射频电源，然后通过激励线圈（drive coil）将电磁波输送到房间内。
The room measures 3mx3mx2m. First, an RF power supply with an output frequency of 1.34 MHz is installed outside, and electromagnetic waves are transmitted into the room through a drive coil.
通过房间墙壁上的导电表面和导电极来产生共振磁场，最后再用一个小线圈组成的接收设备就可以给手机等设备充电了。
The conductive surface and electrodes on the room walls generate a renosant megnetic field. A receiving device composed of a small coil can charge the mobile phone and other devices.
该系统的关键之一就是建立了一个共振结构生成共振磁场：这是通过放置在壁腔中的集成电容器来搞定的，它可同时将电场捕获在电容器内部。
One keys to the system is the construction of a resonant structure to generate a resonant magnetic field. This is achieved by integrated capacitors placed in the wall cavities, which can trap electric fields inside the capacitors at the same time.
而电磁在方形的房间内传播会形成死角，此外线圈接收器也需要与磁场对齐来接受能量，所以系统的另一个关键是如何让房间的每一个角落都布满磁场。
Electromagnetic waves propagating in a square room will create dead zones. In addition, coil receivers need to align with the magnetic field to receive energy. Therefore, another key of the system is to distribute the magnetic field to every corner of the room.
作者将接受方式比喻成用网抓蝴蝶，成功的关键是让房间内有尽可能多的蝴蝶并且蝴蝶飞的方向也尽可能多。
The author compares this receiving method to catching butterflies with a net. The key to success is to have as many butterflies as possible in the room, with the butterflies flying in as many different directions as possible.
因此，该系统最终生成了两个独立的3D磁场：一个围绕房间的中心转，另一个在各个角来回转，这样就能保证设备在房间的任意位置都可以充电了。
Therefore, the system creates two separate 3D magnetic fields. One rotates around the room’s center and the other moves around the corners, enabling device charging at any position inside the room.
当然，方形的房间四个角还是会照顾不到，所以东京大学正在建设的这个专门的无线充电室为一个铝制的八边形（高2m，直径3mi）：
Naturally, the four corners of a square room remain uncovered. Hence, the special wireless charging room being built by the University of Tokyo is an aluminum octagon (2m high, 3m in diameter).
这样就全方位无死角了。
In this way, there will be no dead zons in all directions.
这是该充电室和市面上的无线充电设备第一个区别：可以任意位置充。
This is the first distinction between the wireless charging room and available wireless chargers: position-free charging.
而小米虽然今年提出了一个真正的无线充电桩（原型阶段），可以真正做到数米远都能给手机充电。
Xiaomi also unveiled a true wireless charging pile (prototype stage) this year, capable of charging phones from several meters away.
但它也有一个问题：功率还不够大，只有5W。当然，目前常见无线手机充电设备比如iPhone 12最高也只有15W。
Yet it suffers from low power of only 5W. By comparison, mainstream wireless chargers like the iPhone 12 support up to 15W.
所以这个无线充电室的另一个优势就是它提供的至少50W的功率。
So another advantage of this wireless charging room is that it provides minimum 50W power output.
而且不用担心安全，这个充电室完全符合FCC规定。
What's more, there is no need to worry about safety, this charging room fully complies with FCC regulations.
最后，除了给手机等设备充电，该技术还能运用到可植入医疗设备、家中或工业环境中的移动机器人等。
Finally, apart from charging mobile phones and other advices, the technology can be also applicable to implantable medical devices and mobile robots for home and industrial use.
随着技术的进一步改进，这种无线充电室提供的功率还会更高。
With the further improvement of technology, the wireless charging room can achieve higher power output.
论文地址：https://www.nature.com/articles/s41928-021-00636-3
Address of the paper: https://www.nature.com/articles/s41928-021-00636-3
参考链接：
Reference link:
https://techxplore.com/news/2021-08-room-powers-laptops-wires.html
Https://techxplore.com/news/2021-08-room-powers-laptops-wires.html
