Everything you need to know about Qi wireless charging

January 31, 2018


What it is, how it works and why you want it.

Wireless Charging, also known as Inductive Charging, is a convenient and cable-free way to charge your electronic devices. It requires two things:


  1. A charger, usually in the form of a puck, a mat or a stand that connects to a power source.

  2. A smartphone, smartwatch or other electronic device that is compatible with wireless charging.

Now you’re ready to charge! Simply place your phone onto the charging base and charging starts immediately.



1.  Convenience

Connecting to a wireless charger is faster and easier than plugging in cables. Just set your phone down onto the charger, and it starts charging immediately - no need to free up your other hand to find and connect a cable. Wireless chargers also protect your phone from damage caused by repeated connecting and disconnecting, and are more robust than charging cables which may end up showing signs of wear and tear.

2. Stay charged

Imagine giving your iPhone or Samsung phone a little battery boost every time you put it down. With wireless charging, you can. Wireless chargers come in all shapes and sizes. With one on your nightstand, on your desk, even in your car, it’s easy to keep even the hardest working device charged all day.

3. Speed

Wireless charging is just as fast as using conventional chargers. A 5-watt charging pad will charge your smartphone just as quickly as a 5-watt/1 Amp wall charger – which is usually the kind supplied with your smartphone.


Exactly what is Qi wireless charging? What are the different kinds of Qi wireless technologies? Do they all work with your iPhone, Samsung phone, or other device? And how does wireless charging use magnetic fields to provide a faster and safer charging solution? If you want to learn more about how wireless charging works, we make sense of it all in this easy-to-understand guide.

Qi is an established, evolving wireless charging standard owned by The Wireless Power Consortium and backed by more than 200 leading companies including Apple, Philips and Belkin. Their goal is to deliver wireless charging easily and safely, while ensuring compatibility across all devices that bear the Qi logo.


Qi standard products include:

  • iPhone X

  • iPhone 8 Plus

  • iPhone 8

  • Samsung Galaxy S8

  • Samsung Galaxy Note8

It’s important to make sure you have the right charger to charge your smartphone or tablet. Look for the Qi logo on packaging to check compatibility with your Qi phone before you buy.

There are two different types of Wireless Charging. Here’s what you need to know.

1. Inductive

Requires direct physical contact between the phone and wireless charger. The charging coils inside the phone and the charger must be connected and aligned.

2. Resonant

Requires the phone, wireless charger and charging coils within each, to be within a specific proximity but do not need to be touching.


The secret to how wireless charging works is electromagnetic induction:

  1. A transmitter coil in the charging base sends out a signal.

  2. The signal searches for a receiver coil, like the one in your compatible smartphone.

  3. When it senses one, electromagnetic induction begins.

  4. The electrons (electricity) inside the transmitter coil start to flow around in the coil.

  5. This generates a magnetic field, which is sensed by the electrons in the receiver coil

  6. The electrons trapped inside the receiver coil start to flow around the coil due to the magnetic field

  7. This flow of electrons inside the receiver coil is the electricitypowering the battery in your smartphone.

  8. NOTE: Charging device must be no more than 8mm from the charging coil to receive charge from wireless power source.

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