Developed wireless charging for moving objects


Existing wireless charging technology is in fact not free from wires. The user is tied to a special module on the table, and the dream of a free moving around the house with a charging gadget remain only dreams (external batteries is an option in extreme cases, and covers with the battery significantly increase the thickness and sometimes look silly). Stanford scientists are one step closer to solving this problem. The developed system allows air to transfer electricity to the moving objects.

How it works

The researchers used the achievements of their colleagues from mit, which back in 2007 introduced a system of wireless transmission of electricity a stationary object. The technology is based on the principle of magnetic resonance, but moving the receiver usually requires complex control algorithms. Experts at Stanford University have overcome this drawback by replacing the standard radiator of radio waves in the transmitter amplifier with a feedback circuit. As a result, the system without human intervention selects the optimum resonance frequency depending on the distance.

Scientists demonstrated the technology on the example of a moving led light that burns without reducing brightness within a meter from the source. While we are talking about milliwatts of power, but this is only the beginning. The project authors add that in tests we used a General purpose amplifier with an efficiency of only 10%, whereas the optimization scheme will allow to achieve efficiency higher than 90%.


On the basis of this technology it is possible to create a truly wireless charging for smartphones and other portable devices, and medical implants. The researchers add that in the future, the system will allow the electric vehicle to replenish the battery charge while driving.

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We have already talked about a fully wireless charging, MotherBox, which works at a distance, but only within a radius of half a meter and with a noticeable loss of power on the border. The specialists of Disney Research presented a room for the wireless charging of gadgets, but the walls, floor and ceiling of the room should be metal. In the future, the developers plan to do a conductive paint, by the way, the Windows and doors do not break the system. In the prototype room wirelessly recharged and worked 10 devices (no, not the kettles and heaters, fan, lamp, remote control cars and so on). It is assumed that in this way it is possible without harm for a person to transfer up to 1.9 kW of power.

In 2015 in the UK were also presented the concept of wireless charging of electric vehicles in the course of Dynamic Wireless Power Transfer, but the project has long been unheard of.

Source: SU News

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