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What is Wireless Charging & How DO Wireless Charging Work

You can say those times goodbye where you needed to plug your phone with the charger and wait for the phone to get juiced up. Imagine you are on your bedside table, or on a restaurant table or inside your car, and you charge your phone without any hassle of a cable. Thanks to Wireless charging, that this is now all possible. You don’t need your cables to charge your phone anymore. Though almost all phones have a charger with them, the new wireless charging system has taking phone industry in a new revolutionary turn.

Today, techt20 team will tell you what wireless charging is with some of its brief details. Without waiting anymore, let’s hit the topic.  

Wireless charging, also known as inductive charging is a method where without the use of cables you can charge any compatible device. You can do so, simply by placing the device on the wireless charging spot. You can start charging up your smartphone’s battery by simply placing it face up on a special mat or tabletop and that will be enough.

Wireless charging image


Wireless charging requires two things. The first thing you need is a smartphone that supports wireless charging. Or, you need a case that you can put on a smartphone to add wireless charging if the phone doesn’t come with built-in wireless charging option. The second thing you need is a wireless charger. The sizes and shapes of these two little pucks or mats may vary. The wireless charger may look like larger mouse mat or small discs built into furniture.


Wireless charging, in most cases, is slower than charging a smartphone with a cable if the smartphone has fast charging technology. On the contrary, you’ll find some wireless chargers that are faster than others. These wireless chargers are modern higher powered chargers what are capable of charging a large battery fully within two hours. Wireless chargers are rated by their wattage. While you can see that 5W and 10W chargers are very common, by output amperage, you’ll get chargers with 1A at 5V wireless chargers. These chargers are comparable to a 1A USB cable charger which are quite standard and comes with phones like iPhone 7.

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Wireless charging is pretty safe to use.  The electromagnetic fields that are generated by it have lower power and are limited in space. Only when a receiver is put in the range of a transmitter, only when they operate over distances.  In addition, there are ferrite shieldings in the transmitting and receiving coils that reduce the release of the electromagnetic rays. There’s no evidence of dangerous human health when exposed to inductive charging according to the investigation of the ICNIRP. In some ways, wireless charging is even safer than traditional wired charging. Since there’s no direct charging contact with cables, power supply, and sockets, wireless charging system transmit energy with electric shocks protection.


In the wireless charging industry, there are a couple of competing standards that are designed for portable gadgets such as smartphones.  You can find both the Wireless Power Consortium’s QI and the PMA or the AirFuel Alliance standards in most smartphones. It means that they will be fitted with the most available chargers. When it comes to wireless charging standards, Qi is rapidly becoming the most popular wireless charging standard. QI wireless charging is used by Apple for its new iPhone 8 and iPhone X.


Wireless charging procedure simply works by transferring energy from the charger to the receiver in the phones back by electromagnetic induction. The charger creates an alternating electromagnetic field by using an induction coil. The receiver coil in the phone converts the alternating electromagnetic field back into electricity. The battery then feeds the electricity to get juiced up. The device and the charger have to be in close to each other. They have to be correctly aligned over the top of each other. Although, you don’t need a set orientation. Since the 1990s, rechargeable toothbrushes and other bathroom accessories have been using inductive charging.

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Wireless charging has been on smartphones since the Palm Pre in 2009. Some of Nokia’s Lumia Windows phones like 820 and 920 had this wireless charging support in 2012. Google Nexus 4 also had this function and Samsung has been supporting wireless charging in its Galaxy S series since the s4 got released in 2013. Besides, you can also find wireless charging in a variety of smartwatches like Apple Watch, Moto 360 and LG Watch style. Moreover, you can find this system in some tablets such as the Nexus 7.

Not only phones and watches but also some laptops have wireless charging system as well. Unfortunately, those laptops are not compatible with the technologies and standards that are used for smaller gadget charging.


Wireless charging can cause most phones and some chargers heat up slightly on their back. You don’t need to worry about this much as smartphones tend to heat up slightly when being charged even with cables. The difference in heating up between cable and wireless charger is pretty small.


Wireless charging cannot be done through metal with current technology.  That means, for wireless charging, your smartphones have to have either plastic or glass backs. Having a glass back will make the smartphones more fragile, to be honest. Wireless charging, although, can work through thin plastic cases, it may not work through thick cases. This totally depends on the phone and the charger.


Wireless charging is taking over the smartphones nowadays and it’s true. Most devices support either multiple standards or at least the QI. In the near future, we are hoping that wireless charging is going to become a standard part of our smartphones.

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