Wireless Energy Transfer

We know that it is possible to transmit and receive energy via electromagnetic radiation with no wires. The problem is refining the technique to make it safe and make it work beyond short distances. It should be possible with current technology to make charging points in a working (or living) environment that allow short range charging to occur whenever a valid device gets within range of the point. This means that in order to charge an appliance (like a cell phone), all you would need to do is get it close to the charge point and allow the two devices (the charge dispenser and the charge receiver) to synch up and begin transferring energy. Very soon, we will be able to recharge most if not all of our everyday electrical devices without using cords and it will probably be done automatically in the background of normal operation.

The Wireless Future of Energy Transfer – [singularityhub.com]

Wireless energy is built on the principle of resonant coupling. The devices use copper coils that, if tuned to the same frequency, can resonate with one another. One coil is plugged into the wall, and creates an electromagnetic field; another coil nearby resonates with the first field, picking up some energy in the process to fuel your electronics. The magnetic field lets energy flow regardless of obstacles in the way, so the current can travel through walls. Currently, the type of radiation involved can only resonate within a few meters.

Wireless Power Transfer – [mit.edu]

Results of our research on the feasibility of using resonant objects, strongly coupled through the tails of their non-radiative modes, for mid-range (i.e. a few meters: e.g. within a room, or a factory pavilion) wireless power transfer applications seem to be quite encouraging.

WIRELESS ENERGY TRANSFER CAN POTENTIALLY RECHARGE LAPTOPS, CELL PHONES WITHOUT CORDS [mit.edu]

With the proposed designs, non-radiative wireless power would have limited range, and the range would be shorter for smaller-size receivers. But the team calculates that an object the size of a laptop could be recharged within a few meters of the power source. Placing one source in each room could provide coverage throughout your home.

Soljačić is looking forward to a future when laptops and cell phones might never need any wires at all. Wireless, he said, could also power other household gadgets that are now becoming more common. “At home, I have one of those robotic vacuum cleaners that clean your floors automatically,” he said, “it does a fantastic job but, after it cleans one or two rooms, the battery dies.” In addition to consumer electronics, wireless energy could find industrial applications, for example powering freely-roaming robots within a factory pavilion.

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