Wednesday, December 7, 2022

A Simple Wireless Charger For Smartphones

By Sakthivignesh R.

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Smartphone batteries need to be charged frequently, generally more than once a day. But their charging cables tend to get damaged after some time due to excessive use, which can be annoying—especially if they fail when these are needed the most. A wireless charger can be a convenient alternative; you simply set it up and forget it. But how does it work, exactly?

Fig. 1 Coils’ winding
Fig. 1 Coils’ winding

While wireless charging may seem like a recent invention, its origin dates to more than a hundred years. The credit for it goes to the famous Serbian-American inventor, Nikola Tesla.

Working principle

In the late 1800s, Nikola Tesla successfully transmitted electricity through the air. He used a process called resonant-inductive coupling for it, which works by creating a magnetic field between a transmitter (to send electricity) and a receiver (to receive the electricity) to power light bulbs in his New York City laboratory.
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A few years later, he patented the Tesla coil—a tower with a coil at the top that shot bolts of electricity. Tesla had much grander vision of a wireless power grid, but his dreams were never realised. Now the same basic principle of inductive charging can be used for a smartphone’s charging wirelessly.

This project will be published in a few weeks. If you want to access it now, refer to Electronics For You’s August 2022 Issue–print or ezine edition.

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