How to Choose a Wireless Charger?

March 21, 2019

One of the biggest troubles of daily life is how to get our mobile charged quickly when we go outside. If you bring the charging cable and outlet adaptor, you will find it’s pretty hard to find an electrical socket , especially the cord is often easy entangled, broken or lost.

With the pursuit of convenient lifestyles, many brands such as Apple, Samsung, Huawei, ZTE and other wireless charging applications, wireless charging has gradually become a popular choice for mobile phone charging either at home or outside the door.

So how to choose a wireless charger that’s actually suitable for your phone during the tons of wireless charging options in the world?

Currently there are two mainstream wireless charging technologies, one is Magnetic Resonance and the other is Electromagnetic Induction. There four major charging standards are Qi standard, PMA standard, A4WP standard, and iNPOFi technology.

The most mature and common method is electromagnetic induction. The basic principle is to use the principle of electromagnetic induction, someting similar to a transformer. There is a coil at the transmitter and the receiver. The primary coil is connected to a certain frequency of alternating current. Because electromagnetic induction generates a certain current in the secondary coil, thus the energy is diverted from the transmitter to the receiver.

The advantages of this method is suitable for short-distance charging, high conversion efficiency can reach over 70-80%.

Common charging standards on the market are PMA and Qi standards. Currently, products with Qi charging standard in China are mainly mobile phones.

Qi features with convenience and versatility, is a "wireless charging" standard developed by the Wireless Power Consortium(WPC)--First wireless charging technology standardization organization in the World. Firstly, whatever brands of products,you can use Qi wireless charger as long as the product bear a Qi logo.

When we picking up a wireless charger, the very first thing we should consider is to make sure that your phone supports Qi wireless charging standard before you look up the normal specification say materials, power output ,induction range, protection systems ,charging time , size,aesthetics and whether AC adaptor included etc.

As the technology developed, the mobile charging speed is also increased. What we need to confirm is that at which power your phone can support ,is it 7.5W, 9W or 15W?

Sometimes the software system installed on the phone will also affect the charging speed. For example, the iPhone 8, iPhone 8 plus supports 7.5W when running iOS 11.2 or higher, while the same version of the phone is 5W if the installed system is iOS 11.1. Most wireless chargers will indicate the supported charging speed. You can see the supported charging power in the box or specification, and then compare which speed is supported by your phone.

One thing need to remember is that when the charging speed of mobile device becomes faster , the wireless charger will also become faster.

Secondly, you need to confirm whether the input interface type is a common standard interface such as Micro USB or USB-C and whether it supports wall plug. Most wireless chargers can support wall plugs, but some manufacturers are designed to have a proprietary socket interface. It is better to choose a standard interface in case the data cable from being lost or damaged and save your trouble for looking a matching socket interface. To ensure that nothing accidentally happens or avoid other concerns, it is suggested to choose a well-known brand for charging gear, such as Belkin, Ugreen, Samsung, etc. to ensure quality.

In addition, we should also consider the future proofing of wireless charging. A more powerful wireless charger will not hurt the current low-power devices, but also support future device if you will change the phone later. One example, the iPhone 8 and iPhone X only support up to 7.5W for fast charging, but the latest Qi 1.2 standard actually offers up to 15W for compatible devices.