Since 1890, when Nikola Tesla captured the imagination of the world with his invention of the Tesla coil, which could “transmit” electric current through the air without the use of cables, the use of coils for wireless chargingof electronic devices, such as smartphones, seems to be gaining ground, as several electronic device manufacturers are constantly incorporating this technology into the new devices they make available on the market. From electric toothbrushes to tablets, wireless charging is here to stay, and perhaps in a few years, your electronic computer, your vacuum cleaner or even your electric car will be charged wirelessly.
But let's look at the technology behind wireless charging in detail.
Wireless charging works on the principle of electromagnetic induction. In the base station (or charging pad), there is a coil, usually called a transmitter coil. When high-frequency alternating current is passed through this coil, a magnetic field is produced that extends a short distance from the charging pad.
Then, when we place an electronic device on the charging plate that contains another coil on the back called the receiver coil, the magnetic field created by the transmitter coil creates alternating current in the device's coil. Then, an electronic circuit located inside the battery converts this alternating current into direct current, resulting in charging the battery.
Although this method of charging the battery is not as efficient (about 60 to 70 percent compared to the cable), this technology is constantly being upgraded in combination with technologically modern lithium-ion batteries, which have no problem being charged with sudden bursts of energy that come from wireless charging.
source: techmaniacs.gr/
