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Wireless charging uses the same physical principles that generate inductive heating effects. Basically, you can generate an electromagnetic field that, in turn, allows the transfer of captured energy between metal objects located in the field.
When you heat a saucepan full of water, for example, you simply pull electrical energy from the stove up to the metal coil etched at the bottom of the pan. This heats the pot and boils the liquid inside. The same basic idea applies to batteries. In this case, the charger uses an induction coil to generate an oscillating magnetic field. This field supplies the battery of the target device with energy by electromagnetic induction via a similar copper coil. Essentially, it's the same as removing energy from the stove, but instead of wasting it in a pot of lukewarm water, you drop it into a battery.
, as do the Samsung Galaxy Note 9 and 8, the Sony Xperia XZ3 and the Blackberry Priv with similar standards. The problem, of course, is that none of the wireless charging systems developed has met with considerable commercial success. This may well change with the recent (re) emergence of the Qi standard.</p>
<p>The inductive load, however, has some other disadvantages. On the one hand, the process is slower than traditional loading, due to the huge amounts of energy waste (read: heat) generated by the process. That is, these devices get very hot when you leave them on their charger for more than a few minutes at a time. Normally, it's not a security problem, but you end up on a commercial flight with a Galaxy Note 7 with 6% remaining battery and you have a choice.</p>
<p>In addition, the inductive load does not work with the metal at the moment. This means that phones compatible with inductive technology must have a glass or plastic back to be able to access the wireless charging stations (hence the new back of the Pixel 3). The size of the inductive coils also has an impact on their effective range. Since the terminals of a Qi charger usually only measure a few centimeters, their charging autonomy is extremely limited. However, even the largest coils are prone to low power transfer efficiencies – usually providing only about 40% of the total energy supplied (according to a 2007 study of MIT's physics professor, Marin Soljacic).</p>
<p>Yet, despite the many well-documented weaknesses in technology, it still stands a good chance of success, especially given Apple's stated support for the Qi standard. It remains to be seen whether Apple will pay more than words. On the one hand, the iPhone 8 and the iPhone X are Qi compatible, although these charging accessories are clearly missing from the company's latest product event. On the other hand, a sizeable portion of the world's population has had to buy new headphones because of a unique decision made by Apple in terms of design, so that the support has weight if it is not. The company chose to handle it.</p>
<p>Unfortunately, Google does not seem to have the social capital needed to similarly change the behavior of the public. So, if we do all this wireless charging, it will probably only happen when Apple has been approved.</p>
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