What qi technology does the phone support? How Qi wireless universal chargers work. Advantages and disadvantages of wireless charging in general
For better charging and faster data transfer, I would like to tell you about a technology that should help us get rid of wires as a class. As you might have already guessed, we will talk about wireless charging standards for smartphones and other gadgets. We will find out how they differ from each other, and, most importantly, how they work. Let's find out!
Just in case, let's start with the basics. Wireless charging, as the name suggests, is a method of transferring energy without using any contact surfaces. Those. This means not only the absence of wires, but also of any connectors or pins.
Today, wireless charging is not as popular as we would like. Manufacturers are not too willing to integrate such technology into their devices, and the mass appearance of charging stations in public places has not yet been observed. One of the problems, as in general in most electronics industries, is the lack of uniform standards. And that’s exactly what we’ll be talking about.
Qi
Currently, the most common wireless charging standard is Qi. It was developed by the Wireless Power Consortium (WPC). It is the Qi standard that is supported by many manufacturers of smartphones and tablets, including such monsters as Asus, Motorola, HTC, Huawei, LG, Nokia, Samsung, Blackberry, Sony and others.
The transfer of power occurs from the transmitter to the plate inside the device. For successful charging, the plate must lie (be in a parallel plane) with the transmitter, and the distance between them should not exceed 4 cm. The charging process itself occurs due to electromagnetic induction. The current passing through the primary coil in the transmitter creates oscillations in the electromagnetic field, which in turn creates a current in the secondary coil located in the plate of the recipient device.
The main difference from competitors, who also use the principle of electromagnetic induction, is the operating frequency. In the case of Qi, it is 100-205 kHz.
P.M.A.
Another standard that also uses the principle of electromagnetic induction is called PMA. Introduced by Powermat in 2012. It may not boast as much support from device manufacturers as Qi, but it still has some tricks up its sleeve. The thing is that the charger consists of two parts, and PMA decided to focus on the transmitter rather than the receiver.
It was recently announced that the popular coffee chain Starbucks will introduce PMA wireless charging to all of its locations in the United States by the end of 2015. You can find out more about this in one of the pages on our website. As you know, hipsters love to flock to Starbucks, so this way PMA can gain popularity.
So far, the standard is fighting exclusively in the United States. In particular, it is used by local telecom operators as a tool for healthy and not so healthy competition. This is how AT&T is promoting PMA, cutting out wireless charging of other standards in its operator devices.
Although PMA uses a physical charging principle similar to the Qi standard, electromagnetic induction, there are still differences. As already mentioned, they lie in the operating frequency, which for PMA is 277-357 kHz.
At the moment, PMA is quite behind Qi in popularity, and the mobile devices in which this standard is preinstalled can be counted on one hand. But still, the forces behind the promotion of PMA are quite strong, so it is too early to completely write it off.
The standard, created by A4WP (Alliance for Wireless Power), uses Rezence technology. It is even less popular than PMA, but is worth mentioning if only because it uses a different energy transfer technology.
The creators position the technology as the “next step”, because with its help you can charge devices at a much greater distance than in the case of electromagnetic induction, and objects such as books or other household items will not become an obstacle. Also, several devices can be charged from one station at once, creating a so-called smart charging zone around the dock.
The principle itself is based on the magnetic resonance effect. This is what allows you to significantly expand the charging area from one dock, as well as charge several devices at once. The transmitted power can reach 50 watts, which may be quite enough for a laptop. At the same time, the “mat” itself, unlike Qi or PMA, does not need to be built into tables if, for example, you want to implement such stations in your cafe. It is enough to secure them under the tables, this will not become an obstacle for Rezence.
Despite all the coolness of the technology, Rezence cannot yet boast of great success. The technology is supported by such monsters as Qualcomm, LG, Intel, HTC and others, but so far it has not reached commercial samples. However, A4WP recently signed a cooperation agreement with PMA, so it is quite possible that Rezence or its next incarnation could become the second generation of wireless chargers.
Conclusion
Personally, using wireless charging would allow me to almost completely eliminate cables when using a smartphone, because I now use them exclusively to recharge the battery. The function of data transfer was taken over by cloud services, Pushbullet, Airdrop and their analogues.
At the moment, mass implementation of any of the standards is still quite far away. Although Qi is now installed in most devices that support wireless charging, its meaning is often offset by the lack of a widespread network of “mats” and their high cost. Those. in fact, charging can only be used on a home/work mat, which, by definition, lies in one place. Or you will have to carry this “mat” with you, but you still have to plug it into an outlet with a wire, so all the charm of wireless charging disappears.
Potentially, the abandonment of wires, including those that not only transmit information, but also energy for batteries, is not so far away. The industry is evolving, standards are emerging and improving, so someday we must eventually arrive at a world without wires. In the end, Elon Musk himself will develop this direction, and he does not like to throw words to the wind.
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The method of charging gadgets without direct contact with wires is increasingly becoming part of our lives.
There is no longer any need to regularly connect your phone with wires to a power outlet. It is enough to place it on a special surface, and the battery will begin to receive power.
How does wireless charging work?
Wireless chargers are based on a physical phenomenon called magnetic induction, which allows electricity to be transferred over a distance from one induction coil to another.
The main part of such a device is the charging station, which is a primary coil in a plastic case. It is connected to an electrical outlet, after which an electromagnetic field is created at a short distance around it. The smartphone, equipped with a secondary receiver coil, is placed on the charging station and begins to receive electricity to power the battery.
What is Qi?
Theoretically, wireless charging capability can be implemented in different ways, so the characteristics of the charging station may vary. This means that a wireless charger from one smartphone may not work with a smartphone from another manufacturer.
To avoid this, the world's electronics manufacturers have united in the Wireless Electromagnetic Energy Consortium and adopted a single standard called Qi. In Russian it is read as "Qi". It is within the framework of this standard that most wireless chargers and phones are produced.
The maximum power of wireless charging is 5 W with a current of 1A. This is enough to successfully charge your smartphone battery. The efficiency of such chargers is slightly lower than those that operate from outlets, so it will take a little more time to reach 100% charge.
On top smartphones from well-known brands such as Samsung and iPhone, the receiver (receiving coil) is installed at the production stage, and this does not affect the thickness of the gadgets - they remain thin.
DIY wireless charging
If the manufacturer did not initially provide for wireless charging, then using a special adapter you can fill this gap. There are special films with an induction coil on sale, which are selected depending on the smartphone model. They can be installed under its cover. In this case, the connection is made through the contacts provided for this purpose.
It is also possible to place the coil between the back cover and the case, and a special cable from it is installed in the power connector. The thickness of such a film-receiver is about 2 mm, so the external appearance of the gadget will remain virtually unchanged.
The intensity of electromagnetic radiation from a charging station is lower when compared to a cellular signal. When the battery charge reaches 100%, the power controller turns off the induction field. Therefore, users should not fear for their health - such a charger will not cause any harm.
Where to charge “over the air”?
The wireless way to recharge the battery is gaining more and more recognition. Special podiums for wireless charging are appearing in cinemas, cafes, and airports. Thanks to a single standard, they can charge any Qi-enabled phone.
Manufacturers of interior elements successfully install charging stations in tables, chairs, and table lamps. In new car models, engineers have provided special podiums in the dashboard where you can place your smartphone for charging. Moreover, there is now no need to purchase car chargers that operate from a cigarette lighter, which saves the user from unnecessary wires.
There are several technologies for transmitting electricity through the air, including using lasers, sound waves, and other interesting methods. But so far only one can be called commercial - the use of electromagnetic induction, through which Faraday and Tesla tried to transmit energy. The most common inductive charging standard today has been developed by the Wireless Power Consortium for about seven years. This standard is called the Chinese word Qi - pronounced “chee” in English or “qi” in the Russian translation tradition. It is officially supported by almost all mobile phone manufacturers, from Samsung, Sony, Lumia phones, to small companies whose names mean nothing to anyone. Some American airports, British McDonald's and Starbucks are promised to be equipped with charging stations that meet this standard within a year, and this, as it becomes clear, is just the beginning of the list. This also includes new IKEA furniture and lamps with built-in charging panels - they will begin to be sold in Europe this month. Even Apple, which, as always, stands a little on the sidelines and does not officially support Qi, seems to still adhere to WPC principles in its watches.
How it works
Wireless charging using WPC technology involves the presence of induction coils in the phone and the charger: one acts as a receiver, the other as a transmitter of electricity. When the charger is connected to the mains, a voltage arises in it, and a magnetic field arises around its transmitter coil. When a phone enters this field, electromagnetic waves in its receiver coil are converted into electricity - the phone's battery begins to charge. The Qi standard implies that for complete energy transfer, the distance between devices should not exceed 3–5 centimeters. That is, they should practically touch each other. Therefore, most of the current induction chargers are small panels on which you need to place the phone. At the same time, their efficiency is about 75–80% - slightly less than that of wired chargers.
What are the pros and cons
If we talk about the average user, inductive charging has only one significant advantage. It eliminates the need to connect a cable to your phone (player, camera, watch and other small devices). And although it is called wireless, it does not actually remove the wire, since it is needed to connect the charging panel to the outlet. These panels also have other disadvantages: they are a little more expensive and on average charge one and a half to two times slower.
Is wireless charging dangerous?
This is probably the most popular question asked by the Wireless Power Consortium, and mobile manufacturers, of course, answer that it is safe. Manufacturers of electric shavers and electric toothbrushes are trying to convince everyone of this - the same induction principle has been used for a long time to recharge them. But it is worth keeping in mind that the electromagnetic waves through which wireless panels transmit energy belong to the spectrum of so-called non-ionizing (and therefore safe, unlike, say, X-ray) radiation. Electromagnetic waves of the same spectrum are used to transmit signals from radio stations, cell towers, and Wi-Fi routers. For example, a mobile phone signal is transmitted constantly and over much longer distances, but for its receiver to operate, only a small amount of power is required (within 1–2 watts). The maximum power of wireless panels of the Qi standard is significantly higher - 5 watts. But they (for now) work at extremely short distances, and they also turn off automatically (which means they stop emitting waves) if the device is charged.
In any case, no one has yet presented convincing evidence that Qi wireless charging (like a cellular signal) can threaten health. However, the Wireless Power Consortium is also working on more powerful wireless chargers (up to 120 watts) capable of charging laptops. But they are still being cautious with these devices, and no one seems to be releasing them.
Which devices support Qi wireless charging?
You can find out about this by searching on the WPC website. It is worth remembering that to carry out wireless charging you will need two things: a receiver and an energy transmitter. Some phones (and wearable devices) already have built-in charging modules, also known as receivers; all that remains to do with them is to select a wireless panel, also known as a transmitter. Other phones - all iPhones, for example - do not yet support this technology. In addition to the panel, you will also have to buy a special case or attachment with a charging module that connects to the smartphone via the usual charging connector.
Examples of wireless chargers
Samsung Wireless Charging Pad
PowerBot
Bestseller and, judging by reviews, the best wireless panel on Amazon. Compatible with Qi standard receivers. It comes with a micro-USB cable (which means it can be connected to a laptop or portable battery). Quite reliable and inexpensive model.
Perhaps the most exciting promise of recent years is a breadbox-sized transmitter that allows you to charge phones, smartwatches and bracelets, remote controls or gamepads at a distance of up to 10 meters. This is already a largely wireless technology, freeing you from fiddling with the charger. It doesn’t matter whether the phone is on the table or in your pocket: as soon as it is discharged and is within range of the transmitter, it will begin to charge it. However, the device being charged must be equipped with a special Cota receiver. The developers promise to begin delivering these receivers to device manufacturers at the end of the year.
iQi Wireless Charging Receiver
Finally, an example of how things are going with wireless charging of Apple phones. Since iPhones do not yet support the technology, crutches come to the rescue in the form of cases, attachments and other accessories. For example, Duracell cases for $120, which Apple itself recommends in its store. But the most amazing device for the same purpose is the iQi receiver card, which is connected via the Lightning connector and hidden under a regular phone case. The project, which successfully raised funds on the crowdfunding platform Indiegogo, can now be found on Amazon (although it’s probably better to try to wait for the seventh or eighth iPhone: one or the other, according to rumors, will have its own built-in receiver for wireless charging).
It would be great if you never had to charge your smartphone, or if it charged without any contact while connected to a Wi-Fi hotspot. Unfortunately, today no manufacturer can promise you this, but there is a way to forget about the need to connect a charging cable. We are talking about the so-called. Today, the Qi standard is actively developing, and many devices already support it. Let's figure out what it is and whether we should use it.
What is this?
So, as already mentioned, wireless charging allows you to top up your device's battery without connecting a power cable to it. However, a charging contact is still needed, and the device will not start charging until it is placed on a special charging platform or mat. Some devices natively support wireless charging technology, and the necessary elements are built into the case, and some devices can be taught to charge wirelessly using a special case, which, however, seriously increases their size.
Supported devices charge using induction, which means the element needed for wireless charging is nothing more than a coil that is charged using electromagnetic fields. This process occurs unnoticed by the human eye. The only thing you will see is a battery charge indication on the smartphone screen.
Why is this necessary?
In fact, using the charging cable is not convenient enough. Cables become frayed, tangled, and lost. It is much more convenient to have a platform that is always in one place, at home and at work. The Qi standard is widespread today, and today wireless chargers can be found in cafes, hotels and many other places. This is more convenient than looking for a socket and cable suitable for your smartphone.
Finally, the last and most unobvious advantage can be appreciated by owners of devices protected from moisture. When there is no need to connect the cable, there is no need to open the plug on the case, which wears out quite quickly and is not very convenient.
What are the disadvantages?
I would like to say that there are none, but this is not so. The main disadvantage of wireless charging technology is that it is less energy efficient. The smartphone will not charge as quickly as when connecting a cable, and the electricity will be spent less efficiently, and some of it will be lost in the form of heat. However, slow smartphone charging should not bother you if you can always place your smartphone on a mat at home or at work.
Another disadvantage is the rather high cost compared to conventional chargers. This is a more complex technology, and this leads to another nuance. Wireless charging is quite difficult to integrate into a device that is too thin.
Which devices support wireless charging?
Almost every modern device supports wireless charging, but some, like the iPhone, won't charge without an additional accessory. Devices from Asus, Google, HTC, Cat, LG, Kyocera, Motorola, Nokia, Samsung, Sony and Yota Devices support wireless charging. A complete list of such devices can be found at this link.
Based on materials from AndroidPit
Wireless charging technologies for electronic devices have been developed by manufacturers for a very long time. Perhaps the most familiar popular option for their actual use can be considered some models of electric toothbrushes. In this case, the advantage of this solution, in addition to the convenience of charging, is the absence of external electrical contacts, which are not very practical in a bathroom. It is also worth paying attention to the regular operation scenario of this device and the absence of the need to charge the brush in other places.
However, the smartphone market has not yet seen widespread use of similar solutions, which look very convenient. In our opinion, there are several reasons for this. The first two are quite typical for most new technologies: an increase in cost and a small number of available “response” parts - the wireless chargers themselves. But the more important reason is the significant change in the mobile device charging scenario. When using a cable, you lose only one thing - the ability to move your smartphone over a long distance. Moreover, in most cases this is not very significant (in addition, you can simply use a long cable). At the same time, you can continue to use telephone conversations, the Internet, mail, multimedia and all other applications. You can't do this with wireless charging. It necessarily requires the smartphone to be on a special stand while charging. Although, of course, you can imagine an option with a speakerphone or headset.
It turns out that in fact, wireless chargers may only be interesting in a limited number of scenarios - for example, in a docking station for charging at night or when navigating in a car. For frequent everyday or emergency use today, they are not very convenient. However, the option of chargers in cafes that are already being tested may also prove useful. Over the past few years, smartphones have received bright high-resolution screens with large diagonals and powerful multi-core processors, but the active operating time on a single battery charge has remained virtually unchanged. If they were able to guarantee that they would last more than a day, the situation would be different - the user would only need to use a wireless charger at home, placing the smartphone on it overnight. It should also be noted that for popular devices such as tablets, the use of wireless charging is less likely. In particular, they require a higher power supply than smartphones, and in addition, the stand will be too large. (By the way, it should be noted that during testing we found that in some combinations, a certain fixed position of the smartphone on the stand is required for operation.) The use of wireless charging with headsets or other accessories is also unlikely; the reason for the lack of such solutions will be the inability to use sufficiently large receivers coils in these devices.
In general, the following advantages of a wireless solution can be noted:
- no mechanical/direct contact;
- possibility of use in hostile environments;
- ease of use (in some cases).
However, there are also disadvantages:
- less efficiency;
- long-term charging;
- increase in the cost, weight and size of a smartphone;
- inability to fully use the smartphone while charging.
But we must admit that recently there have been certain changes in this area. Not every manufacturer, even the largest, has the strength to create a truly universal solution. It can be considered that standardization began in 2008 with the creation. The option they developed, called Qi, is today the only solution recognized by a large number of market players. In total, according to the consortium, at the time of writing, almost 200 companies were represented in it, and there were more than 350 products on the market that support this standard. Qi can be found in products from HTC, LG, Motorola, Nokia, Philips, Samsung and other manufacturers.
Another organization in this area is formed in 2012. Its member Qualcomm is currently offering its implementation of a technology called WiPower.
It is also worth mentioning, created in 2012, which also aims to develop and promote an industrial standard for wireless charging. Following him, a working group was organized in October of this year.
Currently, you can find Duracell Powermat products on the market, but they are not widespread and are not used by smartphone manufacturers, so later in this material we will consider Qi solutions.
Technically speaking, a wireless charger uses an electromagnetic field to transfer energy from one device to another. If we talk about the current Qi implementation, here in the low power section the following characteristics are set: distance of about 5 mm, maximum power 5 W. Let us recall that a power of five watts corresponds to the most common wired chargers with a USB interface and a current of 1 A. In addition to the coils themselves, the process involves special controllers that monitor the supply and reception of energy, and the controller is a unit installed in the mobile device.
Below we will look at three solutions of this standard from different manufacturers in terms of ease of use, charging speed and compatibility.
Nokia
Nokia offers two accessories to enable wireless charging of its devices: Nokia Wireless Charging Plate (DT-900) and Nokia Wireless Charging Pillow by Fatboy (DT-901). They differ only in design: the first is a strict device made of plastic, and the second is a soft and flexible “pillow”. Both models come in several vibrant colors to match the Nokia Lumia lineup. The remaining characteristics are the same: support for the Qi standard, an external power supply 12 V 0.74 A with a cable 1.8 m long.
In testing we used the DT-900. The stand body is made of plastic, in our case, bright red. Its dimensions are relatively small - about 120x60x11 mm.
The upper matte surface has the manufacturer's logo in the center, around which there is a low rubber edge. It allows you to keep your smartphone on the charger. Note that the large dimensions of the panel roughly correspond to a smartphone with a 4.5″ screen diagonal. So modern large devices will cover it completely.
The edge and bottom surface are made glossy. On one of the short rounded ends there is a power supply input, and on the opposite side there is a white charging indicator. At the bottom of the panel there is a rubber insert that prevents slipping.
The included cable is red, but the power supply itself is white. It is worth paying attention to the parameters of this unit - it produces 12 V 0.75 A, which is significantly more than standard wired chargers produce. In particular, the standard AC-16 is designed for 5 V 1 A. It can be seen that the power losses are significant.
The list of compatible devices includes models from Lumia 720 and higher. However, only the Lumia 920 has a built-in receiver; for the rest, you will need to purchase an additional back cover, which communicates with the device through contacts located on the back of the smartphone. In particular, when working with the Lumia 1020, the cover increases the weight by 30 g and the thickness by about 2 mm. Perhaps this solution is more interesting than the built-in module in the Lumia 920. At least until such technologies are used everywhere.
The device turned out to be quite convenient to use. Its small size allows you to easily place it on a table, bedside table or shelf. The built-in indicator lights up during charging, which begins literally a couple of seconds after placing the smartphone on the stand. Please note that if you use large smartphones, this indicator may not be very visible. It is also worth paying attention to the non-standard power supply and connector. The other models reviewed in this article can be “transformed” into regular chargers and used with most smartphones by simply unplugging the Micro-USB cable from the cradle.
We conducted the first charging test together with the Nokia Lumia 920. The test showed that the wireless charger is capable of working even with a completely discharged device, which, undoubtedly, should be considered a plus of the solution. As for the time to fully restore the charge, with the DT-900 it turned out to be almost the same as with a standard wired power supply - about two and a half hours. So the charging speed in this case can be considered high, but the main thing is that it will be convenient for the user to predict the required time, since it does not depend on the option used.
Compatibility testing with the Samsung Galaxy S4, equipped with a proprietary wireless charging cover, was successful. The smartphone was able to fully restore its charge in about 3 hours and 10 minutes. It is also possible to start working with a completely discharged battery.
Note that Nokia has an unusual model of an external battery with wireless charging - Nokia Portable Wireless Charging Plate (DC-50). The cost of the Nokia DT-900 at the time of writing was about 2,600 rubles. Branded covers with receiving modules were offered for 1000-2000 rubles, depending on the model.
Samsung
Samsung chose a slightly different approach to packaging. Its S Charger Kit accessory includes a charging stand and a new smartphone cover with built-in charging circuits.
When used with the Samsung Galaxy S4, it increases the weight of the device by 20 g and the thickness by about 2 mm. It is interesting that the currents are indicated on the components: 5 V 2 A is required at the input (this is what the standard unit from this smartphone produces), but at the output you can only get 5 V 0.65 A.
The stand body is made of plastic. Its dimensions are about 161x91x12 mm. The top panel uses a gray semi-gloss material. Its concave shape helps to hold the smartphone in the desired position. The manufacturer's logo is visible in the center. However, if we talk specifically about the Galaxy S4, then it is noticeably smaller than the stand - the dotted line exactly corresponds to the size of the smartphone.
The main body is glossy white. In the center of one of the short ends there is a Micro-USB socket. To the side of it, on the upper edge, there is a green LED, which lights up when the smartphone is placed on the stand and charging begins. The location for the indicator is not very well chosen - it would be more convenient to see it on the opposite side. However, due to the large size of the stand this is not very significant. Most of the bottom is made of rubber, which allows the stand to stay firmly on the table.
The time to fully charge the Samsung Galaxy S4 is about three and a half hours. Testing the operation using a 1 A power supply showed that, in fact, the requirement for a two-amp model is not justified; a less powerful unit will be quite sufficient. This replacement does not affect the duration of wireless charging. Note that this configuration is also capable of restoring a completely discharged smartphone.
Let us remind you that when using the supplied wired charger, the charge recovery time is about two and a half hours. At the same time, up to 90% the charging speed is quite high, but at the last ten percent it decreases.
In domestic stores, this kit is offered for about 3,000 rubles.
PowerQi
The presence of a standard allows different companies, not just smartphone manufacturers, to produce compatible devices. In particular, we managed to find an almost “nameless” version of the PowerQI T-100 wireless charger for testing.
The package includes a stand, a power supply (5 V 1.5 A) with a Micro-USB cable and a special receiver unit. The last element is usually individual for each smartphone model; in our case it was the antenna and control unit for the Samsung Galaxy S4. The approximate cost on foreign trading platforms is $35 for a charger with a power supply and $10 for a receiver unit.
The stand is made of white glossy plastic and has dimensions of 150x80x10 mm. The flat top has slightly beveled edges and lacks any rubberized elements, so it doesn't hold the phone in place very well. The panel is painted in gray paint with the name of the company and model, as well as the logo of the wireless charging standard. The stand rests on four rubber feet.
The LED lights up green when there is external power, and when the smartphone is installed for charging, it changes color to blue. We also note that a sound signal sounds at this moment, which allows you to be sure that the device is recognized and charging begins.
The receiver unit consists of a flat antenna and a small board with a controller manufactured by Texas Instruments. It is supposed to be installed under the standard cover of the smartphone with connection to the contact pads present on the case.
Note that the output current indicated on the receiver is 600 mA. For smartphones that do not have this capability, there are options in the form of cases with connection via a standard Micro-USB. Interestingly, this antenna seems to be slightly smaller in size than the standard Samsung accessory; this may require more precise positioning of the smartphone on the transmitter. In our testing, this situation arose with the Nokia charger due to its compact size.
Charging time for a smartphone with a proprietary cover on a PowerQi stand is approximately 3 hours 30 minutes, so from the point of view of transmitters, these models are the same. Other combinations of receiver and transmitter give similar results, including the ability to restore the charge of a smartphone with a completely discharged battery.
Conclusion
Many companies today are showing interest in wireless charging technologies for smartphone batteries. However, no revolutions should be expected here. There are many players in the market, it is difficult for them to come to an agreement with each other, and in addition, the familiar “chicken and the egg” problem arises. So today, it’s probably not worth considering the presence of a built-in or optional wireless charging module as mandatory for top-end devices.
In this article we looked at several solutions developed according to the Qi standard. They showed good compatibility and were generally quite functional. The only cause of some concern is the relatively low possible power in this Qi modification, which does not allow for rapid charge recovery of modern devices with high-capacity batteries. However, if we consider these solutions as a night charger, they will be quite sufficient for most smartphones. As for active work scenarios, for example, navigation in a car, it is quite possible that the wireless docking station will not be able to restore battery charge while simultaneously running resource-intensive applications, but will only act as an additional power source, reducing the rate of discharge of the standard battery .
In any case, Qi technology can be considered already quite mature and suitable for use not only by enthusiasts, but also by ordinary users who find this scenario useful for themselves. Moreover, it is not at all necessary to use original accessories - solutions from lesser-known companies offered on Internet sites at a relatively low cost may also be suitable.
