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電子工程網

標題: WiFi手機充電器，行嗎？ [打印本頁]

作者: 老郭 時間: 2010-1-14 13:23
標題: WiFi手機充電器，行嗎？
看到一則新聞，說CES上展出一種可以利用WiFi信號為電池進行充電的東西。WiFi信號能量密度那么小，還不如陰天的陽光呢，這東西行嗎？

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2010-01-13 來源:驅動之家

智能手機愛好者總是嫌自己的手機電池續航能力不足，往往在出門的時候帶上備用電池，也有一些廠商推出了利用太陽能等技術的隨身電源，近日一款名為Airnergy Charger的新型充電器產品在CES2010亮相，它的神奇之處是可以利用WiFi信號為電池進行充電。

雖然無線路由器的功率不是很高，發射出的WiFi信號輻射能量也很小，但是Airnergy卻擁有足夠高的轉換效率將微弱無線信號攜帶的能量變為電能，在CES展會中這款充電器在90分鐘內利用無線信號為一塊黑莓手機電池充入了30%的電量。

充電器內置有一個蓄電池，用戶可以隨身攜帶該產品，只要在有WiFi信號覆蓋的地方就能為手機充電，與太陽能充電技術相比，Airnergy Charger不受天氣環境影響。該產品的生產商RCA表示，他們將在今年夏季推出售價為40美元的USB充電器，WiFi充電器隨后上市。

作者: 我愛電路圖 時間: 2010-1-14 13:39
技術是會不斷提高的，至少可以實現無線充電了，筆記本可以不用插線了，更加靈活和便攜。

作者: chunyang 時間: 2010-1-15 18:25
這個消息不可信到扯蛋的地步！估計又是白癡妓者的高作。手機電池就算600mAh吧，黑莓定位商務手機，至少多數型號的電池容量肯定比這個大，算小值，那么30％的容量也有差不多200mAh，90分鐘充入，需要的充電電流在100mA以上，而這個充電電流數值折合成功率在0.5W左右（按單節4.2V鋰電池計），可Wifi的發射功率遠不到這個數值，高明的妓者是在報道永動機。

作者: 老郭 時間: 2010-1-15 18:33
這回可是老外報道的，許多媒體都報了，包括Computerworld

Power harvester uses Wi-Fi to charge wireless devices

Computerworld - RCA showed a prototype of its Wi-Fi Hotspot Power Harvester called Airnergy that's designed to convert Wi-Fi radio signals into DC power for charging small wireless devices such as smartphones.

The small device called the Airnergy, is about 2 in. by 3 in. in size and is expected to sell for $39 to $49 this summer. RCA is working on a smaller version that would take the place of a battery inside a handheld device and would sell for around $59. That smaller version might ship in 2011, according to a demonstration at the 2010 International CES recorded on video by Geeky-Gadgets.com.

RCA officials could not be reached to confirm the details. According to a spokesman in the video demonstration, the device was able to charge a BlackBerry Bold with about 30% power in 90 minutes using a nearby Wi-Fi access point. The amount of charging time depends on a user's proximity to the Wi-Fi hot spot.

Demonstrations of wireless chargers have been a staple of CES for several years, and some products promised in 2008 have not materialized.

Some products, such as the Dell Latitude Z laptop, allow charging by placing the laptop directly on a wireless charging stand.

And Fulton Innovation LLC showed products and prototypes at CES. One Fulton technology concept powers a 12-watt light bulb from a transmitter placed 35 inches away.

Wireless charging could prove popular. Powermat USA showed new wireless charging mats for handheld computers at prices ranging from $39 to $149, and the company's CEO said Powermat has sold 750,000 devices since the company launched in the U.S. two months ago.

One blogger questioned why a charger would be needed, since a person within a hot spot might also be close enough to plug a device into a power outlet to recharge it. The usefulness of the device would depend partly on how close a user must be to the Wi-Fi access point, and whether a power outlet is available.

Matt Hamblen covers mobile and wireless, smartphones and other handhelds, and wireless networking for Computerworld.

作者: 老郭 時間: 2010-1-15 18:42
我看這米國記者也玄。

1. RCA officials could not be reached to confirm the details. 找不到人也敢報；

2. The amount of charging time depends on a user's proximity to the Wi-Fi hot spot. 你要是貼到access point肯定充得快，可是別人就完全沒信號了，能量都被你吸走了

作者: chunyang 時間: 2010-1-15 18:44
白癡妓者哪都有，國外還有叫獸到處招搖說早有人研發出核聚變發電機甚至什么真空零點能發動機（估計是看了科幻劇Stargate當真了）什么的，因各國政府的共同“陰謀”隱而不發……

作者: sz_kd 時間: 2010-1-15 23:04