I still remember some conversations about wireless charging a couple of decades ago, or maybe a little longer. Those were times when wireless connections were nowhere near as prevalent as they are today, and while (especially thanks to the wireless boom of the second half of the 1990s) there was a pretty clear future of two-way data connections crossing the ether, the power thing still seemed like science fiction.

I even remember, from those times, a person of whom I have fond memories, joking about precisely that, about wireless charging. If they had told us what we would be seeing 20 years later, we probably wouldn’t have taken it so jokingly. But that’s the thing about this technology sector, now that it has managed to turn consumer electronics into almost a basic good for any member of society, it is stepping on the accelerator in terms of innovation, giving us every so often some leap of the most remarkable.

Wireless charging is a clear example of this, although at this point we must distinguish between two variants, one that is already clearly established in the market, and another that for the moment can only be seen in laboratories, but has already proven to be operational. The first, as you can imagine, is induction charging, which has been around for a few years now and has a great future ahead of it, given the enormous increase in charging speeds it is offering.

The other variant, which is undoubtedly the first thing we think of when we talk about wireless charging, is remote wireless charging, i.e. one in which the electrical energy is able to be sent through the air from a transmitter, connected to the socket, to a receiver to which the smartphone is connected. In recent months we have seen working models from Xiaomi and Motorola that already allow this and which, if allowed by regulators, could reach the market sometime between 2022 and 2023.

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However, it’s not all optimism around wireless charging systems. There are concerns about how these charging systems may affect devices and, in some cases, also people in the vicinity of the charging devices. In low power charging, as we can find nowadays, there are no serious doubts about its safety, but as the charging power increases, there are some doubts about whether it could be harmful.

And yes, surely this will be familiar to you from the many controversies from the proliferation of mobile telephony, and many studies that pointed to risks that it could be carcinogenic, something that many years later has not yet been confirmed, and probably will not come to do so. Now, does this mean that wireless charging and, in general, electromagnetic signals are harmless to humans?

Obviously the answer is no. The effects of an electromagnetic field on human beingsThe intensity, frequency and energy depend on each other. We don’t have to go far to find an example of this: the microwave. Inside it, an electromagnetic field is generated with the specific properties to stimulate the water molecules, causing their friction to heat them up. This electromagnetic field is dangerous to humans, which is why it is generated inside a Faraday cage, to ensure that the electromagnetic waves do not leave the interior.

China limitará la potencia máxima de la carga inalámbrica

With wireless charging systems of, let’s say normal speed, the signal charge is low, so they are not dangerous, or at least no more so than the induction fires that many of us have had in our kitchens for years. However, as their power increases, more doubts arise about the effect that the field created may have on humans. I clarify that there is no conclusive study, to date, that says that wireless fast charging systems are dangerous to humans, what there are some doubts.

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And it is in this context that we see the first regulatory measure in this regard, as we can read in Gizchina, China will ban wireless charging systems above 50 watts. The establishment of a limit is not a surprise, actually, as it is known that they had been collecting information about it for some time. However, the threshold was expected to be somewhat higher, perhaps in line with what some manufacturers are aiming to offer in a few months.

The Xiaomi Mi MIX 4 is scheduled to be unveiled next Tuesday, which is expected, or perhaps it should now be said that it was expected, to feature a high-speed wireless charging system of between 70 and 80 watts. However, this regulatory measure, which will apply in the Asian giant from January 1, 2022, could force the manufacturer to reduce the wireless charging speed of this smartphone and its successors, or to raise a version for its local market and a different one for the international one.

Now the question, of course, is whether this measure taken by China will also be adopted by other countries or whether, on the contrary, studies will determine that more powerful wireless charging systems can be used safely, and that this will make the Chinese government rethink this limit and set a higher one in the future. Either way, this is something to keep an eye on, as it could completely change the future of wireless charging systems. fast charging without cables.