Add QI wireless charging to your smartphone

A couple of months ago, I became the owner of a very interesting smartphone - TCL Idol X S950 (aka Alcatel One Touch 6040D). Today it has one of the best price / quality ratio. I will not list all the characteristics - Google knows them.

I’ll just dwell on 5 "- FullHD (Sharp) - 140.4 x 67.5 x 6.99 - 120 gr. And everything would be fine, but I had to charge it the same way, in the old fashion, everyday wear of a small microUSB connector. The
wires have long been tired, and manufacturers still couldn’t reach the standardization of wireless storage devices, and here Nexus 7 appeared, with the possibility of wireless charging, and it turned out that standardization had arrived at last. Finally, it was decided to upgrade your smartphone with such a convenient function as wireless charging .

Since the phone has a thickness of only 7mm - there was a doubt whether the QI standard receiver will go inside the device.
Therefore, for starters, I took a universal receiver, since our eastern neighbors quickly responded to growing demand and released one. It is designed for in-place installation in any smartphone with a removable back cover. It was made quite competently, but the subject has a non-removable back cover and when connected to the phone it all looks like this: In principle, it’s not bad, nothing sticks out. But there are two but: 1) to connect the cord - you need to pull out the charge, and the firmware that I like (MIUI) is not yet stable, i.e. will have to do this often; 2) I do not wear covers, i.e. it would be necessary to mount the receiver on the back cover, but with the possibility of removal if necessary. - Free Image Hosting

Therefore, I decided to check the charging process itself, and then open the phone - and implant the receiver inside. Checked - charging, it's time to move on.

I measured the actual thickness of the receiver itself: in the main part - 0.8 mm, in the component area there is a maximum thickening of 1.26 mm. This led to sad thoughts (with a phone thickness of 7 mm), but the decision has already been made, and nowhere to retreat.

We open the phone. (Here, even those who already know how to do this with their left hands with their eyes closed - keep in mind that the plastic is quite soft and the attachment ears are very thin, so open it very carefully. I did it.)
How it looks inside, I have often seen in photos and videos posted on the network. An autopsy confirmed that nothing has changed since the filming, accordingly there was only one question - where is it easier to solder the receiver? At first I thought to the microUSB connector, but on the positive contact there is a fairly large polygon, apparently in the lower layer, and it was not very convenient to solder there. Then the contact pads rang and found the contacts I needed displayed on the TP.
See the photo, noted the plus and minus contacts: Then the connector was removed from the receiver and the conductors soldered to the phone TP (the lead wires in the receiver are flat, which in this case is very useful). Soldered without disconnecting the battery, which is NOT CORRECT !!! If you repeat - be sure to disassemble the top and disconnect the battery. - Free Image Hosting

... but I did not want to do this, plus I decided to check the straightness of my hands and the reliability of the circuitry used in the phone. In general - everything went fine. Soldered, flipped the receiver and voila: - Free Image Hosting

A few words, why exactly. The thing is that you intuitively try to put the phone in the center of the charging station, so the receiver’s antenna is also desirable to be as central as possible. When soldering in that place - the receiver just perfectly lay down after the coup. And the second reason is the 1.26 mm that I mentioned. At the end of the battery (where its electronics are) there is a slight thickening, and the battery itself is slightly thinner, and the phone’s electronics are on par with the battery. This thickening is located exactly where it is desirable to position the antenna. So it turned out that it was ideal to put the soft part of the antenna on the thickening, while 1.26 mm would be above the electronics, which is quite acceptable.

Well, then - assembly and verification. So MIUI reports that it is charging: - Free Image Hosting

In addition to the receiver, which was built into the phone, you need a QI standard charging station. There are a lot of them, both cheap Chinese and expensive branded (made in the same China). I settled on this (it has a built-in 10A battery): Although the I – V characteristic for indicating 10000mA data was clearly shot by Chinese devices. In fact, the capacity differs in a smaller direction. But a couple of full charges are enough, and thanks for that, as they say. In general, I am satisfied. It takes longer to charge than from the cord (the receiver is limited to a current of 500mA), but the phone usually goes to charge for the night, so it’s not critical at all. At the end of the charging process, both devices are disconnected from each other. - Free Image Hosting

On the other hand, if you put the station at the workplace, you can take the phone from the station and put it on it, so the energy consumption during working hours can tend to 0 if the work is not on the road. And if the exit - then a similar station, only 12V, can be connected to the car. And having talked, send the phone not to your pocket, but to the stand.

Everything works, the appearance is not broken. A place with a 1.26 mm thickening is felt, but since there is a screen under it, and then a silumin frame, it does not affect the screen. Well, we'll see ...

Actually, an autopsy can be avoided by those who carry the phone in a NOT hard case. There should be enough space between the case and the back cover for the external installation of the receiver. In addition, the external installation of the receiver reduces the heat inside the device, which is more favorable for the battery life cycle. But the inside is much more aesthetically pleasing.

In general, the adaptation of almost any smartphone to the world of wireless charging technologies is not so scary.

PS Do everything you do - do it at your own peril and risk, if you are not confident in your abilities - better not to start. An illiterate opening of the device entails a possible withdrawal from the guarantee, any traces of soldering inside the device - 100% deprive you of warranty service.

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