Wireless transmission of electricity has always been a dream !

Wireless transmission of electricity has always been a dream that scientists have explored since its discovery. The world Tesla was the first to pursue this dream, and he strived to achieve it. He designed and built an electric tower in New York City in 1905 in order to transfer electricity without wires through the air, but his efforts were unsuccessful. However, he achieved success when he lit two vacuum gas lights without wires, relying on the magnetic field of alternating current (AC) resulting from high-value voltage difference and frequency.
The tower that Tesla made in an attempt to wirelessly illuminate New York City, but his attempt was unsuccessful
The tower that Tesla made in an attempt to wirelessly illuminate New York City, but his attempt was unsuccessful

Although the dream is still in its infancy, but in recent times many attempts to transfer electricity with air have been successful, a team of Japanese scientists has been able to transfer 1.8 kilowatts of electrical energy for a distance of 55 meters with high accuracy, and it is worth noting that the Japanese agency expected that the world will become Wire free by 2040 AD.

This experiment is a breakthrough and a qualitative shift in the field of wireless transmission of electricity, as all previous successful attempts did not exceed the distance of transmitting electricity in two meters and the amount of energy is very small. In 2007, a research team at the Massachusetts Institute of Technology managed to light a 60-watt lamp wirelessly on Two meters away, and at that time, this success was revolutionary !!

Technology companies are currently focusing on this technology, and each of them is seeking a head start in it. In 2008, a huge alliance developed between manufacturers and research laboratories in Europe, America and Asia, called Wireless Power Consortium. This alliance resulted in setting an international standard for wireless power transmission. As a first result based on this standard, an alliance of «Nokia», «Sanyo», «Philips» and «Huawei» announced the launch of the first wireless charger for smart phones, and a charger similar to the controllers for gaming players e. This alliance expanded in 2012 with the joining of the Korean electronics giant Samsung.
The idea of ​​working simply

The generation of wireless electricity depends primarily on an ancient scientific feature or phenomenon known as electromagnetic resonance or resonance, and it means the response of a substance to a specific frequency so that it vibrates or behaves in the same pattern or shape in response to that frequency.

According to Ampere's law, when the electrical current passes through one of the wires, a special magnetic field is generated around this wire. The presence of the electromagnetic field creates an induced electric current in the new coil.

Based on these principles, and on what is known as "double magnetic induction", electricity can be transmitted wirelessly by creating an induced magnetic field using an emitter primary winding intended for this purpose. It is also possible to receive this field using another receiver (secondary), and to convert this field into electrical energy without the need for any connections or laying wires. This is the idea currently being applied in making an electric toothbrush, and some other charging devices that need a charging base.

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