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Understand how induction chargers work and see if they are worth it to you

How it works

Induction charging is already an old idea, not 19th century the austrian scientist Nikola Tesla I was already theorizing and experimenting with technology, but it's only now that we're following the popularization in this way, thanks to smartphones. This charging mode only works with these two parts, an inductor and a receiver, smartphones need to come with the ability to receive factory induction, but some companies manufacture adapters that are plugged into the USB port phone and are on the back of the phone.

Please note that some induction chargers are sold without the power source that should go to your wired charger. This should not be a compatibility issue, but in some cases it may not take full advantage of the charger. So the induction base with a USB cable should be plugged into the USB power source you already have, it can be the same one used to recharge your mobile phone.

Since this charging works by a magnetic induction, there can be nothing between the smartphone and the base, magnetic covers and other objects that obstruct the connection between the two can end up damaging the device. To make it work better, it is recommended to avoid very thick, metallic protective caps and it is ideal that the distance between the base and the mobile phone is as short as possible.

The Qi Charging Standard

All technology developed follows a development standard and has operating standards. The most popular induction charging standard today is Qi, designed by Wireless Power Consortium (WPC). This is the standard that should be popularized, since it had adhesion of technology giants like Samsung and Apple. Competitors of this standard include Rezence and Power Matters, which failed to capture a very large market share.

Qi is the leading induction charging standard today and should become even more popular in the coming years

With the standard you can take the technology to many other environments, cars, hotels, airports, coffee shops, this gives people the ability to recharge their phones without having to worry about taking a charger with them everywhere.

For manufacturing companies, the Qi certification Interesting mainly because it is an open standard, that is, there is no cost of joining the technology, companies do not have to pay a high price to use it. The implementation is made on the smartphone and anyone who wants can buy an induction charger for themselves or enjoy the advantage in some establishment that offers it.

Even in the Qi standard there is a difference in maximum power supported during recharging. The most current version, as I write this article, is 1.2.3, and you can follow the update of the versions on the standard site. In short, the difference between them is listed below.

Qi 1.0 – At 5WQi 1.1 – At 7.5W, examples: iPhone 8Qi 1.2 – At 15W, examples: Galaxy S8 and Galaxy Note 8

Each version also receives minor updates, indicated by one more digit, such as 1.2.2 for 1.2.3. The main difference between each is maximum Watts supported during recharging, which has a direct impact on the recharge duration.

If you have a standard smartphone that supports charging, it will function normally within the limits set by the version on the device.

You can check out the full list of Qi certified smartphones on the WPC website.

Therefore, the main difference in this first part is the amount of watts supported. Another difference is in compatibility with the wireless fast charging. A feature that enables faster wireless recharging. These fast charging bases also work with wireless charging smartphones that do not have the technology implemented.

For this to be possible you need two things:

  • A smartphone that supports fast wireless charging
  • A wireless fast charging supported induction base with a power source that is capable of supplying the minimum required power

To check the difference between each of the refills, I tested 3 chargers with varying specifications, check below:

Charger # 1 – 10.8W Fast Charge Wireless Charger – Link at Gearbest

Input: 9V / 5VOutput: 10.8WSupports Wireless Fast Charging: Yes

Test result:

Galaxy S6 Edge: 30 minutes 21%iPhone Xs: 30 minutes 14%Galaxy Note 9: 30 minutes 11%

Charger # 2 – Foldable Qi Standard Wireless Quick Charge – Link at Gearbest

Input: 5VOutput: 9VSupports Wireless Fast Charging: Yes

Test result:

Galaxy S6 Edge: 30 minutes 21%iPhone Xs: 30 minutes 18%Galaxy Note 9: 30 minutes 15%

Charger # 3 – UMIDIGI Q1 15W Wireless Fast Charger – Link at Gearbest

Input: 12V / 9V / VOutput: 15WSupports Wireless Fast Charging: Yes

Test result:

Galaxy S6 Edge: 30 minutes 19%iPhone Xs: 30 minutes 16%Galaxy Note 9: 30 minutes 13%

Variants for reload speed

Something important to consider is that the different battery sizes for each smartphone, the higher the charge in mAh, the longer the charging tends to be, requiring faster recharge speeds to charge faster.

Galaxy S6 Edge: 2600 mAhiPhone Xs: 2658 mAhGalaxy Note 9: 4000 mAh

Charging speed depends on the charger and smartphone combination, newer smartphones have a larger battery, but support fast wireless charging, which ensures that even with more charged batteries, charge at a similar time to older smartphones. with smaller batteries.


As technology is not yet widespread, the price is not yet in the range of traditional chargers. Anyone who wants to can choose to buy from China supplier sites, which guarantees savings. You can find several types of chargers currently on the market, ranging from $ 50 to $ 250. Remember that there is a difference between the standards and that each inductor will offer a recharge speed according to the number of watts offered.

Wireless Chargers Conclusion

Wireless chargers are still far from keeping up with the performance of a wired charger. It makes no sense today to invest money in wireless chargers with speed in mind, the only sense I see in the practicality and convenience of using this standard. Even more with Quick Charge che versions

In environments where you are comfortable and do not have to worry about the charging speed of your smartphone or in a situation where you do not want to charge your phone urgently, wireless works very well. Usually at home or as a visit to someone's home, this model works perfectly and proves to be very useful when thought carefully.

Source: Apple. (TagsToTranslate) induction charging (t) wireless charger (t) standard wireless charger (t) qi