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電能無線傳輸技術再現曙光

發布時間:2013-11-14 07:05    發布者:1770309616
關鍵詞: 電能 , 無線傳輸
目前,數百家公司都在投資電磁場無線電能傳輸技術,而且已經取得了一些進展。這項新技術的工作原理如何?它到底什么時候才能取代有線電纜,投入使用?又會給我們的生活帶來哪些改變?

    尼古拉•特斯拉是19世紀末20世紀初與托馬斯•愛迪生相媲美的發明家。1901年,他從億萬富翁J.P.摩根那里獲得資助,在紐約長島修建了一座高達187英尺的無線電能傳輸塔——沃登克里弗塔。可惜項目最終失敗,特斯拉本人也宣告破產。(特斯拉之前曾在科羅拉多州做過類似的實驗,成功地將25英里之外的200盞燈點亮。不過據現場目擊者稱,他們能感到電流從地面穿過腳底,甚至當地居民在打開水龍頭時,都能看到水流在嘩嘩放電……)

    一個多世紀過去了,無線電能傳輸技術已取得了一些進展。一百多家公司正在研究這項技術,其中既有WiTricity和ProxybyPower等新創公司,又有豐田(Toyota)、英特爾(Intel)、三星(Samsung)和富士康(Foxconn)等跨國企業。目前的挑戰在于:按照功率方程原理,讓電能從通過電纜傳輸變成通過磁場傳輸。

    電能在空氣中傳播時會轉變為電磁場。所以我們可以非常安全地給手機等設備無線充電。現在普遍使用的無線充電式電動牙刷就是這個原理——電能通過磁場從電源傳輸給牙刷。市面上還有不少無線充電板,只要接通電源,再把手機放到上面就能無線充電。不過這種充電板有不少缺點:手機必須放得恰到好處,而且充電時間也很長。新西蘭一家叫PowerbyProxy的公司發明了一套新系統,用戶可以同時把多部手機擺放在充電板上的任何位置,充電速度很快,時間與傳統方式相當。三星公司上個月宣布向PowerbyProxy投資400萬美元。

    下一個目標:無需充電板也能無線充電。位于馬薩諸塞沃特敦的WiTricity公司在這個領域頗有作為。這家公司利用電磁諧振技術在空氣中傳輸電能,意味著電能有望實現遠距離無線傳輸。這項技術的基礎是麻省理工學院(MIT)的研究成果,WiTricity持有獨家專利。它的具體原理如下:如果兩個諧振物體具有相同的頻率,那么電能將非常精確地從一方傳輸到另一方。只要把諧振器插入插座,在另一邊的電動汽車或手機里安裝上對應的設備,它們就能接收到電能,開始充電。WiTricity稱目前已能傳輸高達3300瓦特電能而損耗極小,這已經足夠給一輛電動汽車充電了。WiTricity首席執行官埃里克•吉爾說:“我們都熱愛電能,愿意不惜一切代價獲得它。電能也許是我們最后一個希望無線化的東西,而這個目標必將實現。”

    這個過程是否安全?吉爾稱因為電能以電磁波的形式通過空氣傳輸,這和地球的電磁場類似,所以對人類不會造成危害。美國聯邦通訊委員會(FCC)對電磁場技術有不少規定,WiTricity自稱它的設備都符合FCC的要求。不過,整個工業界仍面臨巨大的挑戰,需要在教育和宣傳上不斷努力,以打消廣大消費者的顧慮。

    英特爾和鴻海/富士康集團將無線充電技術視為筆記本和手機等電子設備的殺手級應用。它們在幾周前投資了WiTricity公司。石油巨頭斯倫貝謝(Schlumberger)是WiTricity的早期投資者,它希望新技術能減少自己油田里的電線數量,以節約維護成本。豐田公司也參與了投資,有消息稱它計劃測試一種用于插電式電動車的無線充電站。

    Backed by the financier J.P. Morgan, Nikola Tesla, the inventor and rival to Thomas Edison, built in the early 1900s the Wardenclyffe Tower, a 187-foot-high structure on Long Island, which he said could transmit electricity wirelessly. The project failed, and Tesla ended up broke. (In an earlier experiment in Colorado, Tesla had wirelessly lit up 200 lamps over a distance of 25 miles, but pedestrians witnessed sparks jumping between their feet and the ground, and electricity flowed from faucets when turned on. Oops.)

    Fast-forward over a century, and wireless electricity is finally gaining some traction. More than one hundred companies including startups such as WiTricity and ProxybyPower and giants such as Toyota (TM), Intel (INTC), Samsung, and Foxconn are investing in the technology. The challenge: to take the wires out of the power equation by transmitting electricity through magnetic fields.

    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.

    The next step: charging without being so tied to a pad. That's the technology a Watertown, Mass., company named WiTricity is developing. Based on work done at MIT, the technology -- on which the company holds exclusive patents -- uses magnetic resonance to move power through the air -- which means electricity can be moved farther distances without a wire. The way it works: Two devices resonate at the same frequency so that the magnetic waves can travel very precisely from one point to another. Plug a resonator into a wall outlet, and a device installed on a cellphone or an electric car receives the power and starts recharging. WiTricity says its system can move an impressive 3,300 watts -- enough to charge an electric car -- with little efficiency loss. Says Eric Giler, the CEO of WiTricity: "We all love electricity and are willing to do almost anything to get it. It will be the last thing to go wireless, but it will go wireless."

    Is the process safe? Because electricity moves through the air as magnetic waves that are similar to the earth's magnetic waves, it poses no harm to humans, says Giler. The FCC has set limits for magnetic fields, and WiTricity claims its devices fall well below that threshold. The industry, however, will still face a tough time educating and persuading consumers that these devices are safe.

    In recent weeks, Intel and Hon Hai/Foxconn, seeing wireless charging as a possible killer app for electronic devices such as laptops and cellphones, invested in WiTricity. Schlumberger, which is interested in cutting the number of wires in its oil rigs to save maintenance costs, was an early investor, as was Toyota, which is reported to have plans to test a wireless charging station for plug-in cars.   

    無線充電技術不僅在民用領域嶄露頭角,在其他領域也大放異彩。WiTricity正在和五角大樓合作,研究如何對美國軍方的拆彈機器人無線充電。目前這些機器人需要人工更換電池,不少士兵在操作時會被敵方的狙擊手槍擊。無線充電將極大地避免傷亡。在醫療領域,病人們所使用的心臟輔助泵需要外接電源,很容易引起感染。WiTricity正在與心臟輔助泵制造商Thoratec合作開發無線充電裝置。

    這項新技術何時才能變為現實?目前所有領域都還在實驗階段,不過吉爾表示,我們有望在未來幾年陸續看到相關的新產品面世。

    到那時,我的手機充電器該何去何從呢?(財富中文網)

    譯者:項航     

    The technology has applications outside the consumer sphere as well. WiTricity is working with the Pentagon to wirelessly charge those robots that disarm bombs. When soldiers try to plug in the robots for recharging, they sometimes get shot by snipers. Doing it wirelessly would reduce the danger. In the medical world, patients with heart pumps have to have electric wires running out of their bodies, which can cause infections. WiTricity is working with heart pump maker Thoratec to create a wireless solution.

    How long before this technology becomes a reality? All these applications are in the testing stage, but Giler says that within the next couple of years many of them will be hitting the market.

    Until then, where did I put that cellphone charger again.


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1770309616 發表于 2013-11-14 07:06:36
Drink More Water Makes You Look Young英國女記者:日飲3升水 4周年輕10歲
You might think I'd have little in common with a camel, but we do share one useful skill: both of us can go for a very long time without water.
你也許覺得自己和駱駝沒有什么相同點,但其實我們確實和駱駝有一種共同的技能:我們和駱駝一樣可以長時間不喝水。

Usually I start my day with a cup of tea, then I might have a glass of water with my lunch and one with dinner - that's about a litre of liquid in 24 hours. It feels like plenty, but apparently it's not nearly enough.
通常我會早上喝一杯茶,然后可能中午吃飯的時候喝一杯水,晚上吃飯的時候再喝一杯水——也就是大約24小時內喝1升水。這似乎夠多了,但實際上遠遠不夠。

After years of suffering headaches and poor digestion I spoke to a neurologist about my regular headaches and a nutritionist about my poor digestion, and both told me I should be drinking up to three litres of liquid a day for my body to function at its best.
在常年受到頭疼和消化問題的困擾之后,我和一位神經科醫生談到我的頭痛癥,又和一位營養科醫生談到我消化功能差的問題,兩位醫生都建議我,必須一天喝多至3升的水,身體才能運轉正常。

I decided to conduct an experiment. What would happen if I drank the recommended amount every day for a month?
我決定進行一項實驗,看看如果我按醫生的建議每天喝足量的水,會發生怎樣的變化?

The photograph of me taken the day I started this trial demonstrates perfectly - and rather frighteningly - what a lack of hydration does to a face.
在開始實驗前一天我給自己拍了一張照片,這張照片清楚——并且令人恐懼的——證實了缺水對面部皮膚帶來的損害。

I am 42, but have to admit I look more like 52 in this picture, which is shocking. There are dark shadows under and around my eyes, which make me look exhausted, a profusion of wrinkles and strange reddish blotches, and my skin lacks any lustre. It looks dead.
我現年42歲,但可怕的是,我必須承認在這張照片里我看起來更像是52歲了。我的眼部周圍有黑眼圈,看起來十分疲憊,臉上還有許多皺紋和奇怪的紅斑。我的皮膚看起來毫無光澤,死氣沉沉。

Even my lips look shrivelled. This is all classic evidence of poor hydration, apparently. Every system and function in our body depends on water.
甚至我的嘴唇看起來都很干癟。很明顯,這些都是典型的缺水癥狀。我們身體中的所有系統和功能都離不開水。

It flushes toxins from the vital organs, carries nutrients to cells, provides a moist environment for ear, nose and throat tissues, and eliminates waste.
水能疏散重要器官中的毒素,將營養運輸到細胞里,為耳部、鼻部和咽喉組織提供濕潤健康的生態環境,還能排泄廢物。

Not drinking enough means all these functions become impaired. So I decided to see how I would look and feel if I drank three litres of water every day for 28 days. The results were astonishing.
如果飲水量不足,則意味著這些功能都將受損。所有我決定考察一下,如果我連續28天每天都喝下3升的水,那么我的皮膚和身體感覺將有些什么變化。結果是驚人的。

  • tissue ['tiʃju:, -sju:]video
    n. 紙巾;薄紗;一套vt. 飾以薄紗;用化妝紙揩去
  • eliminate [i'limineit]video
    vt. 消除;排除
  • wrinkle ['riŋkl]video
    n. 皺紋vi. 起皺vt. 使起皺紋
  • demonstrate ['demənstreit]video
    vt. 證明;展示;論證vi. 示威
  • flush [flʌʃ]video
    n. 激動,洋溢;面紅;萌芽;旺盛;奔流vt. 使齊平;發紅,使發亮;用水沖洗;使激動vi. 發紅,臉紅;奔涌;被沖洗adj. 大量的;齊平的;豐足的,洋溢的;揮霍的
  • digestion [di:dʒestʃən, dai-]video
    n. 消化;領悟
  • reddish ['rediʃ]video
    adj. 微紅的;略帶紅色的
  • exhaust [iɡ'zɔ:st]video
    vt. 排出;耗盡;使精疲力盡;徹底探討vi. 排氣n. 排氣;廢氣;排氣裝置
  • moist [mɔist]video
    adj. 潮濕的;多雨的;含淚的n. 潮濕
  • apparently [ə'pærəntli]video
    adv. 顯然地;似乎,表面上


linfeng3 發表于 2013-11-19 08:43:02
我家養了一條魚,每天不停的喝水,你看他面容多么的年輕、滋潤啦,都養幾年了,沒有一條皺紋,連“魚尾紋”都沒有。哈哈,原來庸醫的治病方法來自仿生學。有次我真信了,喝了太多水,搞成胃潰瘍。
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