WiTricity Corporation (Watertown, MA)
This disclosure is related to wireless energy transfer sometimes called wireless power transmission.
Description of the Related Art
There are many methods to wirelessly transfer energy or power using radiative (or far-field) and non-radiative (or near-field) techniques. For instance the radiative wireless transfer of information using low-directionality antennas, such as thoseused in radio and cellular communication systems, as well as in computers at home, could be considered wireless energy transfer. This type of radiative transfer, however, is inefficient as only a small portion of the supplied power or radiated energy is absorbed. It’s just the portion that lies in the direction of the receiver and has a connection with it. The majority of power is scattered in all the different directions and is lost in the space. Such inefficient power transfer may be acceptable for datatransmission however it is not suitable to transfer useful quantities of electrical energy for the purpose of doing work for example, like charging or powering electrical devices. To enhance the effectiveness of radiative energy transfer techniques, directional antennas may be employed to direct radiation toward a receiver. However these directed radiation strategies could require an uninterrupted line of sight and potentially complicated tracking and steering systems for mobile transmitters or receivers. Additionally, these schemes may pose hazards for people or objects who are in the vicinity of the beam when modest to high quantities of power are transferred. An unidentified non-radiative or near-field wireless energy transfer technique commonly referred to either induction or traditional induction, doesn’t (intentionally) emit energy, but instead uses an oscillating current that passes through a primary coil, to create an oscillating magneticnear-field which causes currents to flow through the near-by receiving or secondary coil. Induction techniques have proven the transfer of moderate to large amounts of power, but only over extremely short distances and with very small offsettolerances between the primary power supply unit and the second receiver unit. Electric transformers as well as proximity chargers are two examples of devices using this short-range energy transfer technique, also known as near-field energy transfer.
Wireless power transfer system that is able to transfer useful quantities of electricity across long distances and offsets is required. This type of wireless power transfer would allow for energy transfer over greater distances and offsets compared to traditional induction methods. However, it’s not subject to the risks and disadvantages of radiative transmission techniques.Click here to view the patent on USPTO website.
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