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    How does wireless charging work?

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    Pau Monfort
    @paumonfort

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    Some smartphones offer a wireless charging system. Essential for some, not necessary for others, this type of recharge does not convince everyone. But one question remains unanswered: how it is possible to transfer energy without cable o how wireless charging works?


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    Wireless chargers have attracted the attention of the industry. However, there is still a lot of confusion when it comes to how the technology works. Read the following article for it unravels the mysteries surrounding wireless charging.



    While the idea of ​​transmitting energy without using wires seems futuristic or sci-fi, it's not particularly new. Austrian inventor Nikola Tesla created the first theories of wireless power transmission in the early XNUMXth and XNUMXth centuries, but for a long time it was limited to prototypes and academic research and was not widely applied due to its cost.

    Music broadcasts over radios, televisions, and the wireless used on laptops and smartphones work by propagating energetically charged waves to carry data. The only difference is that the devices we want to charge use batteries to work, which makes the process different, but not technically more difficult, even more so considering the small amount of energy required to completely fill the battery, which is around 5 watt.


    To fully understand how wireless charging works, you should familiarize yourself with the concept of electromagnetic field and, in general, with electromagnetic induction, a technology that you may already know by looking at your kitchen hob.

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    Fast charging and electromagnetic induction? At this point, one might ask: but what is the connection between an induction board and a smartphone? Electromagnetic induction is an energy transfer system, and this energy can be stored, as happens in a smartphone.



    How does this energy behave? It's a question of strength, in a way. Imagine two people holding a tight rope: if one decides to make waves with the rope, the other will receive those waves. This is a very simple way to summarize the electromagnetic induction system: a force sends energy from one point to another.


    Its base, powered by electricity, transmits energy to the smartphone via electromagnetic fields. Then, the smartphone's sensors try to absorb these energies and channel them to the battery to store them.

    How is the upload speed calculated? Again, it is a question of strength. Since energy is transmitted through electromagnetic fields, the speed depends on these fields. The bigger they are, the faster the charging will be. The problem is that it is not possible to create huge fields because the smartphone, due to its material form, causes limitations.

    The smartphone, therefore, has a limited transfer rate and the voltage is specified by the manufacturer. The charger also produces energy at a set rate.


    What is Qi? Qi is the best known wireless charging technology. It is not exclusive to a specific manufacturer, which means that virtually all manufacturers can use it on their own devices. Among those who use Qi, Samsung and Apple are the most famous.

    Qi seeks to standardize wireless charging technology, which in turn implies several safety rules that must be followed. Among these rules he mentions the strength of the devices, which, of course, is relevant in determining the loading speed.


    Thanks to Qi, wireless charging technology has made significant progress. The charging speed has increased considerably and the electricity does not cause further serious damage to the device. Note that Qi uses not only electromagnetic induction charging technology, but also magnetic resonance technology.


    Is my device compatible with induction charging? It is recommended that you put the cable charging aside and choose to charge wirelessly. So a question arises: is your device compatible with this technology? If you have a high-quality Samsung smartphone, such as a Galaxy S, the device is compatible and Samsung offers its own charger.


    The new iPhone, the iPhone 8, is also compatible with wireless charging. If you have an older iPhone, you can also use wireless charging, but you need a receiver like QInside Qi2001. Some smartphones such as Lumia, Motorola, Xperia and HTC are also compatible with Qi technology. Several Nexus also allow the use of technology (Nexus 4, Nexus 5, Nexus 6, Nexus 7, Galaxy Nexus).

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    If your smartphone doesn't support wireless charging technology, there are alternatives. You simply connect your smartphone to an adapter, and it will receive power and transmit it to the smartphone via cable, but in this way we no longer have the advantage because you will still need a cable, right?

    Further Reading:

    • How to add wireless charging to any phone [Solved]
    • Qualcomm announces the arrival of its 20W wireless fast charging
    • Fast charging does not work on android phone, how to fix
    • New for smartphones, here is reverse wireless charging
    • Wireless or wired phone charging: which is best?
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