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Are we waiting for wireless battery recharging at a distance?

Wireless battery recharging, based on the principle of electromagnetic induction between two coils, is not a new technology. For a long time, it has been used, for example, for electric toothbrushes, which are automatically recharged when placed in a stand.

But the importance of wireless charging gained with the availability of this technology in modern smartphones. Charging mobile phones by putting them on a special pad or recharging stand is very comfortable, especially because we do not have to constantly handle the charger cable.

For wireless recharging, the Qi standard is the most commonly used today, requiring a charging pad and induction coils built into the back of the smartphone. "The Qi system allows wireless power transfer at a distance of up to four centimeters, but when charging smartphone batteries, it has to be expected to reduce the efficiency compared to conventional chargers. Recharging the smartphone's battery to full capacity lasts a little longer, " explains Radim Tlapák (

From today's marketplace, wireless charging supports premium Samsung and LG smartphones. Some smartphone models can be expanded by using the special rechargeable coils inserted under the back cover of the wireless charging feature. At the same time, a number of different Qi-based wireless chargers are available, including, for example, devices designed to be mounted directly on a desk. "The main problem of wireless recharging in relation to cell phone batteries is a significant increase in the number of charge cycles if smartphone is repeatedly recharged in the rechargeable case," says Radim Tlapák. The regular life of the Li-Ion battery is around 500 rechargeable cycles, so frequent storage of the smartphone on the recharging pad can lead to faster battery wear and the need for replacement.

The future of wireless charging

Wireless charging technology is currently developing primarily in two directions. The first is the use of electromagnetic induction to recharge electric vehicles and hybrid cars - whether in a parking space or during a road trip. In the first case, as with smartphones, wireless charging replaces cable handling with an electrical outlet, while in the latter, wireless technology prolongs the range of electric vehicles.

Another fundamental development of the wireless recharging of small electrical appliances is the possibility of wireless transmission of electrical power over a distance of several centimeters. "At this year's CES fair, Energous introduced a functional wireless wireless solution for a distance of several centimeters and presented a plan to increase the reach of up to five meters," adds Radim Tlapák. When electromagnetic induction is not possible to use electromagnetic induction for long distances, Energous is dedicated to radio waves and special charging chips to which the terminal equipment will be fitted. If this battery recharges remotely, we can look forward not only to wireless recharged smartphones and tablets, but also to headphones, keyboards, mice and other day-to-day small electronic devices. So far, research and development in this area will have to deal with the problems of wireless charging efficiency as well as the impact of wireless power transmission on the users of such recharged devices themselves.

Source: tz, edited editorially

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