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How does wireless charging work?

In recent years, wireless charging has become more commonly available in our daily lives. Already over 500 types of devices, including phones, are in the market which can be charged on our wireless chargers. You may have been using wireless charging for many years already if you possess an electrical toothbrush: you just put it on the holder and it starts charging.

The principle to charge your smartphone or smartwatch wirelessly is the same: just put your phone on a wireless charger or charging pad and it starts charging. Very convenient, no need to connect a cable first. But how does wireless charging work?

From €29.99All wireless chargers
ZEBI03W - ZEBI04W Lifestyle Built-In Wireless Charger

The birth of wireless charging

The way wireless charging works is by something which is called magnetic induction. This was discovered in the 1830’s by Michael Faraday. He discovered that when you move a permanent magnet in and out of a single loop of wire, it induces a voltage. Linking electricity with magnetism. Inductive charging was born.

ZEDC17W - Zens 4-in-1 MagSafe Wireless Charger lifestyle

Seeing is believing

Does the concept of inductive charging still sound kind of vague? Let’s explain by conducting an experiment:

Take a permanent magnet – like the ones you stick on your fridge. Connect a light bulb to a simple loop of copper wire. Now move the magnet quickly back and forth, bringing it closer and further away from the loop. The bulb will start lighting up a little!

So what just happened? Why did the bulb light up? By bringing the magnet back and forth, you change the magnetic field experienced by the loop, which induces a voltage in the loop. The voltage created is in some way comparable to the voltage of a battery.

How does wireless charing work with induction?

Wireless charging your toothbrush, smartphone or any other device works similar as we just showed with the light bulb. In practice, we don’t have a moving magnet but we do have another loop of copper wire, a so-called induction coil. This will carry a changing current at high frequency. These coils are for instance perfectly visible in our Liberty glass wireless charger.

The changing current generates the changing magnetic field. This part of the wireless charging system is called the “transmitter”. The part inside your phone, smartwatch or toothbrush is called the “receiver” and is charged in the same way as the light bulb.

Is wireless charging safe?

Magnetism or and inductive charging are always perceived as being a bit mysterious because you can’t see them, you can’t feel them and you can’t smell them. To build an efficient wireless charging system, you need to limit the magnetic field closely around the copper wire loops.

This is done by special materials called ferrites. These are conducting the magnetic field very well, much better than air does. Therefore, the magnetic field has a preference to flow though the ferrite instead of through the air. Because of that, hardly any field comes out of the wireless charging system and is therefore inherently safe.

qi charger with logo

So what is the Qi standard?

Qi sets the standard for safety when it comes to wireless chargers. The Qi certification is governed by the Wireless Power Consortium (WPC). The WPC is a group of leading companies that cooperate in continuously defining, maintaining and developing the Qi standard for wireless charging.

As a proud member of the WPC, we are offering wireless chargers with the latest technology and safety standards. With a Zens charger you can always safely charge your device, even at night.

ZEMSC2P - Zens Modular Stand Wireless Charger With Extensions And Devices

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