能量無線傳輸

tran tran tran

能量無線傳輸是利用一種特殊設備將電源的電能轉變為可無線傳播的能量，在接受端又將次此能量轉變回電能，從而到達對用電器的無線供電。
現在已經問世的無線供電技術，根據其電能傳輸原理，大致上可以分為三類：
第一類是非接觸式充電技術所採用的電磁感應原理，這種非接觸式充電技術在許多攜帶型終端里套用日益廣泛。這種類型中，將兩個線圈放置於鄰近位置上，當電流在一個線圈中流動時，所產生的磁通量成為媒介，導致另一個線圈中也產生電動勢。
第二類是最接近實際套用的一種技術，它直接套用了電磁波能量可以通過天線傳送和接收的原理。這和100年前的收音機原理基本相同：直接在整流電路中將電波的交流波形變換成直流後加以利用，但不使用放大電路等。同以前相比，這種技術的效率得到提高，並正在推動廠商將其投入實際套用。
第三類是利用電磁場的諧振方法。諧振技術在電子領域套用廣泛，但是，在供電技術中套用的不是電磁波或者電流，而只是利用電場或者磁場。2006 年11月，美國麻省理工學院(MIT)物理系助理教授Marin Soljacic的研究小組全球首次宣布了將電場或者磁場套用於供電技術的可能性。
Wireless energy transfer or wireless power transmission (also known as the Tesla Effect) is the process that takes place in any system where electrical energy is transmitted from a power source to an electrical load, without interconnecting wires in an electrical grid. Wireless transmission is ideal in cases where instantaneous or continuous energy transfer is needed, but interconnecting wires are inconvenient, hazardous, or impossible.
Though the physics of both are related, this is distinct from wireless transmission for the purpose of transferring information (such as radio) through waves, where the percentage of the power that is received is only important if it becomes too low to successfully recover the signal. With wireless energy transfer, the efficiency is a more critical parameter and this creates important differences in these technologies.
The most common and the most viable form of wireless power transfer is carried out using Inductive Power Transfer. The other viable technologies for Wireless Power are based on Microwaves and Lasers.