How wireless charger works.

 Wireless charging has been around for quite some time now. If you own a flagship smartphone released within the past three years, chances are that it supports wireless charging. This feature is also present on some mid-range devices and is in the news again thanks to the iPhone SE (2020) as well as the OnePlus 8 Pro. That's not all, wireless charging is also used to charge some wearable devices and a few true wireless earphones as well. In fact, you can even charge smaller devices wirelessly from your phone's battery. So let me explain what wireless charging is, how it works, and everything else you need to know.

One has to simply place a compatible device on a wireless charging pad, and the device starts charging. This can be extremely convenient, eliminating the need for cables. Whether you have an iPhone or an Android smartphone, the standard is identical and is independent of the port at the bottom of your device.

Before I explain how wireless charging works, I would like to add that there were two charging standards when this concept took off. Qi (pronounced “chi”) was a standard by the WPC (Wireless Power Consortium), and PMA was promoted by the Power Matters Alliance. Both are based on inductive charging, but Qi has been widely adopted by electronics manufacturers and is now the de facto standard so you don't have to worry about compatibility.

How does wireless charging work? It uses electromagnetic induction to wirelessly transmit power between a wireless charger and a device that can be wirelessly charged. To simplify, there is one coil in the wireless charger and another in the receiver.





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