Wireless charging - as a convenient, safe, and reliable charging way - is becoming increasingly popular recently, especially with the launch of iPhone 8 series and iPhone X which comes with wireless charging function. Then, do you know what is the wireless charging and how does it work? And most importantly, does your phone support wireless charging? how to charge it wirelessly? Here’s a simple introduction to wireless charging for you.


What is the wireless charging and how does it work?


Essentially wireless charging (also called wireless power transfer or charging by induction) uses electromagnetic fields to safely transfer power from a transmitting source to a receiving device for the purposes of wirelessly charging (or recharging) a battery. As the name suggests, it does so without the use of a physical connection.


Wireless charging is based on the principle of magnetic resonance, or Inductive Power Transfer (IPT). This is the process of transferring an electrical current between two objects through the use of coils to induce an electromagnetic field.

The diagram below simplifies the process of wireless charging and power transfer into 5 key steps.


It’s through this process that power is safely transferred over an air gap. As well as any non-metal object that might exist between the coils. Such as wood, plastic or granite.



Wireless Charging Standard


Currently, two wireless charging standards stand out on the market: inductive and resonant, includes Qi standard, PMA standard, and A4WP standard. Here’s a detailed look at each and an overview of cutting-edge solutions from Infineon, which as a member of the Wireless Power Consortium (WPC) and the AirFuel alliance is actively shaping the wireless charging trends of tomorrow.



Inductive wireless charging

Inductive charging is the same technology found in Qi chargers (currently the most popular), but this specific solution is owned by the WPC. PMA has also been pushing its own inductive charging technology. In fact, PMA was adopted by many companies so it may work alongside Qi. Even Starbucks decided to go with PMA, so it’s not really a dead concept, even if Qi is the clear winner right now. Both of which support single-coil and multi-coil inductive topologies and use frequencies of 100-300 kHz.

The benefit of inductive charging is that it powers up devices much faster than resonance-based charging, but that has its downsides. These inductive chargers can only charge one product at a time, and they have to be much closer in order to work properly. Less than 1 cm, to be exact.


Resonant wireless charging

Resonance charging is the standard A4WP which operates at 6.78 MHz has been trying to push. Their specific branding is called Rezence, and it uses resonance to charge at longer distances of about 2 inches. It is definitely slower, but it also allows charging pads to power multiple devices at once. These chargers can even communicate with your devices and balance energy, making it a much more efficient solution. Fully-charged devices won’t be using up valuable energy

Finally, Qi standard is the most usual standard now.



Is the wireless charging faster?

In most cases, wireless charging is slower than charging via a cable for smartphones that include fast-charging technology, such as the Galaxy S8.

Some wireless chargers are faster than others, with modern higher-powered chargers capable of fully charging a large battery smartphone in around two hours. They’re typically rated by wattage, with 5W and 10W chargers common, or by output amperage, with 1A at 5V wireless chargers comparable to a standard 1A USB cable charger such as that that comes with the iPhone 7.



Does my phone support wireless charging?

You can search the charging information of your phone on its official website. If not, you can also equip your phone with a wireless charging receiver so that realize the wireless charging.



How to wirelessly charge my phone?

Wireless charging means, as the name suggests, you no longer need to plug a cable into your smartphone to charge it. Simply placing it face up on a special mat or tabletop is enough to start charging up your smartphone’s battery, be it the iPhone X, iPhone 8, Samsung Galaxy S8 or any number of different smartphones that support wireless charging. (If not, equip it with a wireless charging receiver first.)


In the end, we collect some practical and distinctive wireless charger devices for you. Hope you find an interesting one to meet your needs.


HOCO CW3A Portable QI Wireless Charger Quick Charging Pad


Hoco CW3A wireless charger pad comes with Qi standard which fit for most of the phones. 5V - 9V / 1.5A high-speed fast charging modes provide a fast charging speed, more time-saving. Compact size makes it easily carry anywhere. Aluminum Alloy materials provide the good hand feel for users.


Baseus WXHSD Qi Wireless Charging Pad


Baseus WXHSD Qi wireless charger is not only a charging pad but also a phone stand. With the dual coil, it supports both vertical charging and horizontal charging. Besides, transmission of electricity is permissible even through a case with a thickness of not more than 3mm, more convenient to use.


Baseus 15W Qi Wireless Fast Charger


Ultra slim design and cute look make it just like a special ornament for your table. With 9V fast charging design, it only takes 1.5 hours to fully charge your phone. It also supports automatic power off after fully charged, safer to use. In addition, it’s small enough to fit into your pocket so that you can easily carry it anywhere.


Baseus WXTE QI Microfiber Wireless Charging Receiver