Ok, we just got this from Xiaomi, Xiaomi multi-coil wireless charger. We can see the entire package
is orange, pretty nice. And I think there should be no filler inside,
just a box with the charger inside.
Ok, we have opened that, just the invoice.
And then, we can see the product. The product name is printed in front of the packaging.
Xiaomi logo also printed on the side.
And for the specification on the back. We can
see the kind of interface, working temperature, and the size.
Single device can support 20W charging. Dual devices can support 40W charging totally.
Triple devices can support 60W charging totally. So, pretty fast, isn’t it?
After open the box, we can see the charger. There isn’t anything to protect it.
You can see it right after you open it. And the guide paper is placed under the charger.
We can know how to use, where to place, where is the interface, how many devices can support.
Technically, you can just put the devices down, cause it has multiple coils.
And next will be the warranty certificate and detailed instructions.
And here is the cable.
There is a special contact point in USB-A port, which can let us know it’s the special USB-A port.
Only in this way, it can support Xiaomi’s own protocol.
There is another 6A mark in here.
And let’s test the diameter of the cable.
Around 3.9 mm (0.15 inches), a little bit thicker than others.
The entire length is around 102 cm (40.15 inches). It’s enough if you just use it on desk.
It’s really rare for the 120 W charger. And we can also see the special contact in here.
The max output is 20V 6A, 120w, for sure, which it’s too much to charge this
wireless charger. But if you have other Xiaomi devices, like MI 10, MI 11. You can use it to charge.
Apple 96W charger is close to 100W. But you
can see the huge size difference between them.
Tear off the sticker on the USB-C port.
The silver part of the frame should be metal. But we’ll see it later.
The bottom is the rubber pad, feels very smooth, comfortable, and non-slip when you put it on the table.
There is a circle of chamfer at the edge of the border, which is very shining. There is
a charging indicator on the front side. The feel of the panel of this wireless charger
is a bit similar to leather.
There are no obvious scratches, even if we scrape it.
So, the durability should be ok. Let’s take a look at the frame, scrape the
paint on the outside slightly. em, seem like the metal, cause sometimes you feel it’s
metal, but actually it’s just coating. For this one, ought to be metal.
And then we gonna test the weight.
em, 463 g (16.33 oz), and the length is approximately 23 cm (9 inches).
Its width is about 10 cm (3.93 inches).
For the thickness, it’s about 15mm (0.6 inches).
Compared to the other wireless charger that Xiaomi launched. Firstly, it’s the Xiaomi
80W wireless charger, maximum output is 80W. This is the Xiaomi 55W wireless charger, maximum
output is 55W. We can see the “fast charging” mark, if we use it to charge the MI 11, which
means the private protocol has been triggered, I think.
Put it to the corner of the panel. Yeap, it can be charged successfully. And we see the
“fast charging” mark as well. Let’s try another place. Same thing.
And then let’s put an iPhone next to it.
Perfectly working.
And put the TWS headphones next to iPhone.
Perfectly working.
Ok, time is up. Let’s tear this down, to see what’s inside.
We can start from this pad. Poke and tear it down.
It should be two layers. And second layer is transparent.
So, we tear down the pad slowly.
The screws under the pad should be used to fix.
The rubber pad is pretty sticky.
Phillips screws under it.
Now, let’s remove all Phillips screws.
Use our crowbar along the front edge,
pry it, to separate the upper cover from the lower
base. Make it slow, cause I do not want to damage the product. Push up slightly, and
open it along the edge.
And that’s it. We made it.
Just like the back cover of Samsung phones, really tough. Use crowbar to push it up slightly. The coil
should be fixed by glue. So, we need to slowly separate the whole module from the base.
It’s literally metal. But there’s something different. A layer of plastic frame is added to the metal base.
The upper layer is the graphite heat dissipation layer. The black one on the outside
is a rubber pad. The other side is thermal conductive pad, which it’s very thick.
So, it should have good thermal conductivity and protection.
Tear down the heat dissipation layer,
and there are three thermistors, to detect the temperature of the wireless charging
module. There is also a heat-balancing aluminum plate between the PCB and the magnetic conductive
sheet. Tear off the tape covered the coils, which called “mylar” sheet.
The coils are glued to each other by double-sided tape. USB-C port is soldered to the hollow of the
PCB, which will reduce the thickness. For the length of PCB, is about 21.5 cm (8.46
inches), and the width is about 9 cm (3.54 inches), thickness is 2.9 mm (0.11 inches).
This tiny thing is input filter inductor and this is the protective IC, which used
for input overvoltage and overcurrent protection. Here is the voltage controller of input interface
from Cypress, usually used for some high-end equipment. And this big chip is the main controller
chip, comes from chipsvision CV90365, which can control multiple circuits. For example,
the Xiaomi multi-coil wireless charger. It uses the main controller chip to control three
charging circuits. So it can charge up to three devices. Firstly, every circuit has
a buck converter, just this tiny chip from MPS.
And this is the buck inductor, which adopts hollow design to reduce the thickness, and
heat can be dissipated more efficiently. The following is the MOS tube driving the coil,
two chips as a group, three groups totally. The four small white objects in here, are
its NPO resonant capacitors. In this way, it can form a wireless charging circuit.
And then let’s take a look at the second circuit, The second buck converter is in the
middle. Next to it is the buck inductor. This circuit also have MOS tube driving the coil,
and the NPO resonant capacitors. This is two half-bridge drivers from Dioo in here, which
used to drive the wireless charging power tubes.
The third circuit is on right side. Its third buck converter is in here, buck inductor is
next to it. This is the MOS tube driving the coil, and the NPO resonant capacitors. Also,
it has two half-bridge drivers from Dioo in here, used to drive the wireless charging
power tubes. There are four power tubes totally.
This is two operational amplifier chip from 3PEAK LMV324B.
The following chip is the displacement register, used to control the wireless charging
coil. We can see four chips for different coils. Finally, there are 19 MOS tubes on
the top and bottom sides, which are from Adamant, and use to switch wireless charging coils.
Cause there are 19 coils in the front, so it should be 19 MOS tubes in the back.
So, that’s all for our teardown. For this multi-coil wireless charger, the charging
experience is pretty good, cause you do not need to align. But the heat problem can’t
be ignored. We can find by our teardown that this wireless charger adopts graphite heat
dissipation layer and thick conductive pad, which can effectively dissipate heat.
So, for the Airpower Xiaomi version, will you interest in it?
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