Home wireless chargers: how to choose them, which ones to buy

by Mostafa Hasankhani Fard on December 13, 2022

Desktop wireless chargers are used to recharge smartphones, earphones and smartwatches, even of different brands, simply by placing them on the induction mat. Let's find out how they are made, how they work and which ones to choose according to your needs.If the wireless car chargers that we have come to know in this article are a useful if not essential accessory for recharging the smartphone battery without having to disconnect and reconnect the USB cable every time you get in and out of the car, those home (or office ) are equally comfortable and now indispensable .

Uses of the wireless charger at home

Their function is to recharge (or keep charged ) not only the smartphone , during the night or during the day when it is not being used, but also all those accessories and devices that now support wireless charging such as in-ear headphones and smartwatches


Multi wireless charger on bedside room

They do not replace the traditional USB cable , essential for recharging the smartphone while it is being held and used , but they represent its perfect complement for all other uses.

The secret is in electromagnetic induction

Wireless chargers work on the principle of electromagnetic induction . A transmit coil inserted into the charging base sends a signal to the device to check whether the receive coil is integrated in the latter , i.e. whether it supports wireless charging.

Electronic circuit and coil of a desktop wireless charger

If the verification is successful, the wireless charger activates the electromagnetic induction: the electrons inside the transmitting coil start to move, generating a magnetic field which is detected by the electrons in the receiving coil.

The electrons trapped inside the receiving coil begin to move due to the magnetic field and generate the electricity needed to recharge the batteries of smartphones, in-ear headphones cases, smartwatches, etcSchema caricatore wireless smartphone.

How do you power a wireless charger?

To allow the coil to generate electricity and transmit it over the air, the battery charger must be connected to a USB power supply , preferably a new generation Quick Charge 3.0 compatible one (see below).

Typically, home wireless chargers do not include the USB power adapter in the package, both to keep the price down and to protect the environment. In fact, it is possible to reuse the one supplied with the smartphone or the spare one purchased at a later time. The important thing is that the USB plug is compatible and that the voltage and current supplied allow you to fully exploit the potential of the wireless charger (see below).