Standard wireless charger universal. Wireless chargers. Qi standard. Devices from Samsung

Hello dear readers. I'm sure you've heard, at least remotely, that you can charge your phone without using wires. Surely, many dismissed, thinking that such modern technology is only in very expensive devices. And here it is not.

Supports wireless charging almost any phone, however, with some reservations. Branded smartphones already out of the "box" can receive energy through the air, while the rest will have to buy special accessories. Today you will not only find out if your mobile supports wireless charging, but also how to refuse wires if your device is outdated.

Wireless charging - what is it?

Photo: Koolpad Qi

Before considering smartphone models that are equipped with wireless charging, you need to understand its essence. In fact, wireless power transmission is not such a complicated technology as it seems at first glance. Technically, wireless charging is represented by two copper coils.

One plays the role of a transmitter of energy that it receives from the electrical network. The coil is installed in the docking station (a platform on which the smartphone is subsequently placed). The second coil is the receiver. It is equipped with devices that require energy, such as mobile phones. As a rule, the receiver is hidden from view inside the case, unless it is external.

The battery of the device receives energy due to the magnetic field that occurs when the receiver is in the field of the transmitter (usually about 4 centimeters). This principle is true for the Qi standard, which is most actively used in wireless charging of wearable devices.

Smartphone with Qi icon supports wireless charging

The Qi standard was developed by the Wireless Electromagnetic Energy Consortium to transmit power over distances of up to 4 centimeters. Scientists, creating the standard, used the developments that had already been made by many other specialists.

In general, the idea of ​​transmitting energy at a distance appeared two centuries ago, when Marie Ampère discovered a law proving that an electric current generates a magnetic field. A significant contribution was made by Nikola Tesla, who built a tower to demonstrate the wireless transmission of energy. Subsequently, many organizations and scientists were engaged in the study of technology, but a large percentage of the experiments ended in the early stages.

Until this century, the transmission of energy without wires has remained at the level of tests. So far, the technology has not become interesting to large manufacturers of portable electronics. In 2009, after the creation of the Qi standard, which became the most suitable for use in wearable technology, a number of companies began to develop concepts that support wireless charging.

The impetus for firms was the fact that the standard was free and available. Today, almost every flagship smartphone boasts the presence of technology, and the budget one boasts accessories that make the function work for them too.

Not a dozen companies are working on other power transmission technologies besides electromagnetic induction. For example, students at the University of Pennsylvania conducted an experiment in 2011 in which they proved that energy can be transmitted through ultrasound. And in 1945, the Soviet scientist Semyon Tetelbaum in an article described the possibility of energy transfer using microwave radiation. Subsequently, this technology has been actively developed. Energy can be transmitted with a laser beam, which NASA proved in experiments. Nikola Tesla, known for his experiments with electricity, even believed that it was possible to create a worldwide wireless system that would save people from power lines.

List of smartphones with built-in support for wireless charging (2019)

Well, with the theory and history of wireless power transmission now familiar, it's time to move on to devices that support the technology. Speaking of support, we include in the list devices that received the receiver already at the factory (you can install it separately).

To date, more than 80 smartphones have received Qi wireless charging, not counting a number of smartwatch models and other devices. And this figure is growing at an enviable rate. I will try to list as many models as possible - the exact list, which is regularly updated, is presented on the Qi portal.

So, wireless charging is integrated in the models (the list was updated in January 2019):

Apple

• iPhone 8
• iPhone 8 Plus
• iPhone X
• iPhone Xs
• iPhone Xs Max
• iPhone Xr

Asus

• Asus PadFone S

blackberry

• BlackBerry Passport
• BlackBerry PRIV
• BlackBerry Z30

CASIO

• CASIO G'z One Commando

Caterpillar

• Cat S50
• Cat S50C

DeWalt

• Dewalt MD501
• Dewalt MIL810G

Energy System

• Energy Phone Pro Qi

Fujitsu

• Fujitsu Arrows F-09D
• Fujitsu Arrows Kiss F-03D
• Fujitsu Arrows Kiss F-03E
• Fujitsu Arrows X F-10D

Google

• Google Nexus 4
• Google Nexus 5
• Google Nexus 6
• Google Pixel 3
• Google Pixel 3XL

HP

• HP Elite X3

HTC

• HTC Droid DNA
• HTC Windows Phone 8X

Huawei

• Huawei Mate20 Pro

Kyocera

• Kyocera Brigadier
• Kyocera Dura Force
• Kyocera Hydro Elite
• Kyocera Torque G02
• Kyocera Torque KC-S701
• Kyocera Urbano L01
• Kyocera Urbano L03

LG

• LG G2
• LG G3
• LG G6¹
• LG G6 Plus¹
• LG G7
• LG G7 ThinQ
• LG Lucid 2
• LG Lucid 3
• LG Optimus F5
• LG Optimus G Pro
• LG Optimus It L-05E
• LG Spectrum 2
• LG Vu 2
• LG Vu 3
• LG V30
• LG V30 Plus

M.T.T.

• M.T.T. Master 4G

Microsoft

• Microsoft Lumia 950
• Microsoft Lumia 950 Dual Sim
• Microsoft Lumia 950XL
• Microsoft Lumia 950 XL Dual Sim

mlais

• Mlais MX69W

Motorola

• Motorola Droid Maxx
• Motorola Droid Mini
• Motorola Droid Turbo
• Motorola Droid Turbo 2
• Motorola Moto Maxx
• Motorola Moto X Force

mPhone

• iPhone 8

NEC

• NEC Medias PP N-01D
• NEC Medias X N-04E

Nokia

• Nokia Lumia 1520
• Nokia Lumia 735
• Nokia Lumia 830
• Nokia Lumia 920
• Nokia Lumia 928
• Nokia Lumia 929 (Icon)
• Nokia Lumia 930
• Nokia 8 Sirocco

Oukitel

• Oukitel U23

Panasonic

• Panasonic Eluga P P-03E
• Panasonic Eluga V P-06D
• Panasonic Eluga X P-02E
• Panasonic Eluga X1
• Panasonic Eluga X1 Pro

Philips

• Philips X723

Razor

• Razor Phone 2

RugGear

• RugGear RG730

Samsung

• Samsung Galaxy S6
• Samsung Galaxy S6 Active
• Samsung Galaxy S6 Edge
• Samsung Galaxy S6 Plus
• Samsung Galaxy S7
• Samsung Galaxy S7 Active
• Samsung Galaxy S7 Edge
• Samsung Galaxy S8
• Samsung Galaxy S8 Active
• Samsung Galaxy S8 Plus
• Samsung Galaxy S9
• Samsung Galaxy S9 Plus
• Samsung Galaxy Note 8
• Samsung Galaxy Note 9
• Samsung Leader 8
• Samsung W2016

Saygus

• Saygus V SQUARED

Sharp

• Sharp Aquos EX SH-04E
• Sharp Aquos SH-07D
• Sharp Aquos SH-13C
• Sharp Aquos Slider SH-02D
• Sharp Aquos Zeta SH-06E
• Sharp Aquos Zeta SH-09D
• Sharp Q-Pot SH-04D
• Sharp SH-05D

Sony

• Sony Xperia Z3V
• Sony Xperia Z4V
• Sony Xperia XZ2
• Sony Xperia XZ2 Premium
• Sony Xperia XZ3

Techdy

• Techdy Basic Bear
• Techdy Bear Pro

Vertu

• Vertu Aster
• Vertu Signature Touch

Xiaomi

• Mi MIX 2S
• Mi Mix 3

YotaPhone

• Yotaphone 2

ZTE

• ZTE Telstra Tough Max
• ZTE Axon 9 Pro

This is not a complete list - there are a number of models from lesser known companies. Don't be surprised if the popular iPhone isn't on the list. It's not a mistake. Officially, Apple has not yet integrated wireless charging into its products. But there is a way out, more on that below.

The smartphone models on the list only require the presence of a platform, which is necessary for the transfer of energy. It is usually included with the mobile device, but not always. In this case, you will have to purchase a docking station separately.

Usually, the manufacturer releases a branded model, but others can be used - there is no special binding of a smartphone to a specific site. You can even order a cheap "noname" docking station, which in most cases will satisfy the needs of the buyer.

What to do if the smartphone does not support wireless charging

If you did not find your device in the list of supported smartphones, do not rush to get upset. There is an exit. More precisely, there are two of them. So, perhaps your phone is among those for which receivers (small plates with a built-in circuit) are specially produced for wireless charging. This list includes quite popular, but outdated models. There are exceptions, such as the iPhone 7.

Both popular and not obsolete, and the manufacturer did not integrate the receiver. Receivers designed for certain models receive the appropriate designation, as well as the desired characteristics. For example, similar receivers for Samsung Galaxy S 5 or older solutions have unusual contacts that correspond to those under the cover of devices. Here are the most popular models that received special receivers:

• iPhone: starting with the "four".
• Samsung Galaxy: S3, S4, S5; Note 2, 3, 4, Edge.
• LG: G4, V10.
• Sony: Xperia Z3+/Z4; Experia Z5; Experia Z5 Premium.
• Huawei: Ascend Mate 7, Mate S.

The receiver for these devices usually comes with a docking station. You can buy parts separately - there is no particular binding. In addition to boards (receivers), there are also special cases on the market for wireless charging of devices that contain a copper circuit inside. For each smartphone, a case is made in the appropriate form.

Universal Solutions

There are more and more devices supported by wireless charging, but manufacturers are in no hurry to bring the technology to the budget segment. And he is the most popular. Especially cheap smartphones are loved in China, where they came up with the idea of ​​​​producing universal receivers for any model.

A docking station + receiver kit costs about 500-700 rubles (you can find it cheaper), the main thing is to choose the right one for your smartphone. We pay attention to the shape and connector. A universal receiver can be found for almost any smartphone.

Docking stations

Photo: Wireless charging for iPhone

So, figured out the support for wireless charging smartphones. Now I would like to dwell separately on the platforms that are used to transfer energy to the device. What for?

Unlike receivers, which are either hidden inside the phone or are a featureless record, docking stations allow the user to choose the model to their liking. Some companies even provide original solutions that will become part of any interior.

Samsung's oval-shaped wireless charging dock is especially popular. It is suitable not only for charging the company's smartphones, but also for most other models.

Of the features, it is worth highlighting support for automatic shutdown when the device is fully charged, as well as light indication. The average cost is 2000 rubles, but in Chinese online stores you can find a cheap replica for 400-700 rubles.

The model of the Woodpuck FAST Edition Bamboo platform, which is made of wood, is also interesting. The manufacturer, so to speak, combined modern technologies and natural materials. The functionality does not differ from other docking stations, but it looks catchy. The cost is $40.

But Aukey QI boasts compact dimensions that allow you to take charging with you. Yes, and the price is low - $ 30. Fans of purchases from China have a choice of huge catalogs, in which it will not be difficult to find a cheap and beautiful docking station.

Photo: Designo Curve MX34VQ

Among the unusual wireless charging stands, we can highlight the new TV from Asus - Designo Curve MX34VQ. More precisely, the leg on which he stands. It is made in the form of an oval platform, on which the smartphone is placed for charging. It even has a backlight. Asus, following modern trends, has made the new device not only beautiful, but also useful. True, the price "bites".

Outcome

It is safe to say that the list of devices supported by wireless charging will only grow. A technology that can get rid of a bunch of wires is of interest to both the user and the manufacturer, who receives additional income for its presence.

In a couple of years, every smartphone will probably support wireless charging. In addition, not a dozen companies are working on the development of even more advanced technology that will not be tied to a docking station. We, ordinary users, have to wait a bit to forget about the main problem of portable devices - attachment to the outlet.

After the start of sales of the iPhone 8 and iPhone 8 Plus, as well as with the imminent arrival of the iPhone X in retail chains, the question arises of buying wireless charging for new Apple smartphones.

The fact is that the timing of the start of sales of Apple's proprietary wireless charging called AirPower, which can charge three gadgets at once, has not even been announced yet.

Most likely, the point is the integration of the Qi standard with Apple's latest technology for parallel charging. Therefore, today you can only look at third-party solutions.

iPhone 8 and iPhone 8 Plus get wireless charging

For everyone who has already forgotten, let me remind you. September 12, 2017 Apple introduced three new smartphones: iPhone 8, iPhone 8 Plus and iPhone X. And each of them is good in its own way.

The first couple turned out to be just an evolutionary continuation of last year's iPhone 7 and iPhone 7 Plus. The devices practically do not differ externally and carry a minimum of new features.

The 8s received new body colors: cosmic, gold with a pink sheen and white with silver accents - each of them is distinguished by a glass back panel instead of aluminum.

Now they all work on the basis of the ultra-modern A11 Bionic processor, which is simply not faster on the market today - numerous benchmarks have already proved this.

More interesting was the iPhone X, which is not yet available for purchase. It is available in almost black and white with a steel frame all around. And in front of him, the screen is almost without frames.

"You don't need a cable to charge your iPhone - it's pure wireless future. Charge your phone from wireless charging stations and cradles in hotels, cafes and airports. (Apple)

Glass backs in all three smartphones are needed primarily to work with induction-based wireless charging, for which Apple has chosen the open Qi standard.

Features in the operation of induction wireless charging

Let's just get rid of wires all over the world - this is far from news. We are already using Wi-Fi instead of Ethernet with great pleasure, and clouds instead of flash drives and disks are also here.

The first commercial devices with wireless charging, if we are talking about it specifically, began to appear even before 2010. They were the same mice with special rugs.

However, they were eventually supplanted by cheaper and more convenient manipulators using replaceable or rechargeable batteries and radio transmitters.

After trial and error, the most promising for consumer electronics turned out to be the transfer of energy by the method of electromagnetic induction.

It was based on principle of electromagnetism When a current flows through a conductor, an electromagnetic field forms around it. If you bring another conductor to it, the current will be transferred.

It is this principle, which many of us remember from the school physics course, that is used in all modern mobile devices today.

In this case, two coils are used in the receiver device and in the charging itself, with the help of which energy is transferred to the smartphone. And the metal back panel was superfluous here.

Wireless charging uses an open standard - Qi

The real pioneer in the use of wireless chargers can be considered the Palm company, which relied on all these coils back in 2008.

Then the development did not become particularly successful. As a result, two associations were formed in the world, which were engaged in the improvement and dissemination of technology.

In 2008 formed Wireless Power Consortium, which to this day promotes Qi standard. It was he who received the maximum distribution in the world until 2017.

Counterweight for him - Power Matters Alliance. The association, which is also supported by the world's leading manufacturers, is developing the PMA standard.

PMA is less common, but more alive than the living. For example, in the recent past, it was used in the Samsung Galaxy S6 and S6 Edge, S7 and S7 Edge. And today S8 and S8 Plus support both standards.

The iPhone 8, iPhone 8 Plus, and iPhone X use Qi wireless charging. You need to pay special attention to this when buying.

Of course, if you buy normal brands of wireless chargers designed for iPhone, you will definitely not have compatibility problems. However, there is AliExpress.

Advantages and disadvantages of wireless chargers in general

Honestly, until today, I myself practically did not use wireless chargers, even for test purposes. Therefore, I took the thoughts of our Western colleagues and added personal insights. Catch!

➕ Advantages of wireless chargers:

Firstly, your iPhone battery is always charged without much effort. The wireless platform will definitely have a place in your home or office. Get into the habit of throwing the phone there, will be happy.

Secondly, you can recharge the battery of your smartphone without a separate charge in public places. Qi sockets are already appearing in hotels, cafes and even fast food outlets.

Thirdly With wireless charging, you don't risk damaging your iPhone's connector by endlessly plugging in and out of the cable. And it's very cool.

Fourth When you buy a Qi wireless charger, you don't have to worry about iPhone compatibility under the MFi program and you can charge any compatible device with it.

Surveys of wireless charger users in the west show that approximately 40% satisfied and use 20% dissatisfied and do not use and 40% do not know what they are talking about.

➖ Disadvantages of wireless chargers:

Firstly, whatever one may say, but it will not be possible to fully use the device while charging without wires. Traditional cable is definitely preferable here.

Secondly, no matter how much marketing manufacturers pour into the efficiency of wireless charging, it will definitely be slower than charging the battery over a familiar cable.

Thirdly, in the total mass of smartphones, they support wireless charging quite a bit, so you can argue about the versatility of the purchased device.

Fourth, devices with support for wireless charging lose in that without it, the thickness or volume of the battery is just because of the coil. The example of the iPhone 7 and iPhone 8 is illustrative.

Only these features of Qi-charging deserve attention

If, after reading everything I wrote above, you are still in the mood to buy a wireless charger, I recommend paying attention to a few of the important features.

Qi standard. Wireless charging of this standard supports your iPhone 8, iPhone 8 Plus and iPhone X. Don't even look at PMA.

Current strength. The output voltage of wireless chargers is usually standardized and is at the level of 5V. But the current strength can vary. Look at the options at 1-2A, no less.

Appearance. Wireless charging is not a gadget that you will always carry with you, but a part of the interior for your home or office. It should fit in there and be comfortable to use.

Form Factor There are wireless chargers with an inclined design, there are straight ones, and so on. The question is subjective, so it's up to you to decide.

By the way, if your iPhone does not support wireless charging, you can search with Qi support,

Nowadays, a person without a smartphone is a person out of touch with life. It is hard to imagine that a few years ago the mobile phone was used only for communication. Now this little helper gives us both access to the Internet and many applications, and wakes us up in the morning. The list of benefits provided by a smartphone is endless. It is not surprising that a large number of gadgets have been invented for modern phones. One of them is a wireless charger, which we would like to talk about in more detail.

How can I tell if my phone supports wireless charging?

From the name it is clear that this is a gadget that allows you to charge your smartphone without using wires. It is a small stand connected to the network. Inside there is an induction coil, which creates a small magnetic field around itself. If there is a smartphone within the radius of this field, it will receive electricity in the truest sense of the word through the air. But there is one caveat - the induction coil must also be built into the smartphone. It will serve as a kind of energy receiver from the charger.

The goal of creating this device was to get rid of modern smartphones from charger connectors, as well as to allow all devices in the house to be charged from one platform. The idea was a success, but why then do we not see this technology in every home and do not use it ourselves? The answer is simple - despite all the advantages, this miracle device also has disadvantages.

Pros and cons of a wireless charger

There are enough advantages to wireless charging, but they all have their cornerstone.

No wires

Without a doubt, this is a big plus. Wires have always been a weak point in chargers. With frequent kinks, the wire was easily damaged and tangled. Frequent recharging loosened the USB port in the phone, and sooner or later a repair was required. But there is also the other side of the coin. The rejection of wires reduced the efficiency (coefficient of performance) from 90% to 60–75%. Simply put, when using wireless charging, your smartphone will charge for about 2-3 times longer.

Range of use

It would seem that there are no wires - there are no restrictions, and you can charge your phone just being in the apartment. But no - the range of using a wireless charger is very modest (3-5 cm) and the phone will have to be placed on a stand. Another significant drawback will be the impossibility of using a smartphone while charging.

Price

The cost of the charger is quite variable, but it will always be more expensive than the charging we are used to.

Standards

I would like to talk about the standards that made the use of electricity transmission technology over the air possible.

Qi ("Qi", in honor of the term of Eastern philosophy) was developed by WPC (Wireless Power Consortium - Consortium of Wireless Electromagnetic Energy). It is the most widespread and is supported by such giants of the mobile industry as Asus, Motorola, HTC, Huawei, LG, Nokia, Samsung, Blackberry, Sony and others. You can learn more about the standard and the list of supported devices on their official website.

The PMA standard also uses the principle of electromagnetic induction, but cannot boast such a large list of manufacturers supporting their technology as Qi. It was developed by Powermat, which is currently trying to fight unhealthy competition from Qi.

This standard uses Rezence technology, which is fundamentally different from PMA and Qi. The strange thing is that the most unpopular standard has many advantages over its competitors. The pluses include:

• the ability to charge through interference (if you put a book between a smartphone and a charger, nothing will change);
• one platform can power multiple devices;
• work in close proximity to metal objects, etc.

For a complete list of smartphones that can use wireless charging right out of the box, visit the official website https://www.wirelesspowerconsortium.com. I would like to note that most of the manufacturers made sure that their product supported the use of this technology.

What if your smartphone is not on the list of supported devices, but you need to use wireless charging? If you have such a question, then most likely you are a happy user of Apple products. So far, the iPhone does not provide the ability to receive electromagnetic signals. However, there is an alternative - the purchase of an auxiliary accessory that will do this for your phone. It fits under a standard case and does not cause any discomfort.

Is wireless charging harmful to health?

Like any new technology, the wireless charger raises a lot of questions. One of the most acute is whether it is harmful to health. Let's dispel this far-fetched myth. It will do you no more harm than an electronic shaver using the same technology. This is also claimed by the developers of the WPC standard themselves.

We hope our article was useful and helped you figure out the compatibility of your smartphone and wireless charger.

The method of charging gadgets without direct contact with wires is becoming more and more firmly established in our lives.

It is no longer necessary to regularly connect the phone with wires to the socket. It is enough to place it on a special surface, and the battery will begin to receive power.

How does wireless charging work?

At the heart of wireless chargers is such a physical phenomenon as magnetic induction, which allows you to transfer electricity over a distance from one induction coil to another.

The main part of such a device is a 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 around it at a short distance. A 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, the possibility of wireless charging can be implemented in various 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, global electronics manufacturers have united in the Wireless Electromagnetic Energy Consortium and adopted a single standard called Qi. In Russian, this is read as "Qi". It is within this standard that most wireless chargers and phones are manufactured.

The maximum power of wireless chargers is 5W with a current of 1A. This is enough to successfully charge the smartphone battery. The efficiency of such charges is somewhat lower than those that work from sockets, so it will take a little more time to reach 100% charge.

On top smartphones of 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 the possibility of 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 via 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 receiver film is about 2 mm, so the external gadget will hardly change.

In terms of intensity, electromagnetic radiation from the charging station is lower when compared with a cellular signal. Upon reaching 100% battery charge, the power controller turns off the induction field. Therefore, users should not be afraid for their health - such a charger will not cause any harm.

Where to charge "by air"?

The wireless method of charging the battery is gaining more and more recognition. In cinemas, cafes, airports, special podiums for wireless charging appear. Thanks to a single standard, they can charge any phones that support Qi.

Manufacturers of interior elements successfully install charging stations in tables, armchairs, table lamps. In new car models, engineers have provided special podiums in the dashboard, on which you can place a smartphone for charging. Moreover, now there is no need to purchase cigarette lighter chargers for the car, which saves the user from unnecessary wires.

Qi is the Chinese word for "energy flow" (pronounced "chi" in English) and the universal standard for rechargeable batteries such as iPods, cell phones and cameras.

The power transmission takes place due to the fact that the receiver receives energy not through a traditional cable, but in a non-contact way, thanks to the use of electromagnetic fields. The principle is very simple: the Qi transmitter, which is the base station, sends the necessary energy to the receiver.

Technology Description

The Qi wireless charging standard is based on magnetic induction between the flat coils of the transmitting and receiving apparatus. The primary and secondary windings form two parts of the coreless charger circuit is shielded on the lower surface of the primary and the upper secondary coil. This, and the close proximity, guarantee acceptable power transfer efficiency. In addition, it minimizes the impact of the magnetic field on users.

Typically, a base station has a flat surface on which one or more mobile devices can be placed. This ensures that the vertical distance between the primary and secondary windings is sufficiently small. In addition, there are two ways to align the windings horizontally.

In the first case, the user independently sets the secondary winding opposite the primary winding on the interface surface using prompts from the mobile device.

The second method, called free positioning, does not require the active participation of a person. In one implementation, several primary windings are created for this. Another variant uses mechanical means to move the primary coil under the secondary.

Structural elements

The power transmitter consists of two main functional units, namely, a power conversion unit and a communication and control unit. The element of the first, generating a magnetic field, is the primary coil. The second changes the transmit power to the level requested by the receiver. In addition, the base station may contain more than one transmitter to serve several mobile devices, since one primary winding interacts with only one secondary at the same time. And finally, the system unit provides electricity and controls the operation of several transmitters.

The gadget contains an energy receiving unit, which is a secondary winding, and a communication and control unit. The latter regulates the transmitted power to a level acceptable to the subsystem connected to the power output of the receiver. An example of such a subsystem is a battery.

Stages of communication

After activating the communication and control unit of the transmitter, it sends a signal to the receiver to receive a response confirming the presence of a Q-compatible device.

Upon receiving the request, the receiver enters the selection phase. If the offered voltage is high enough, then the ping phase begins.

Upon receiving a response from the transmitter, the mobile device sends a signal strength packet and enters the identification and configuration phase, or sends a power transfer complete packet and remains in the ping phase.

Then an identification packet and control packets are sent. The receiver enters the charging phase. At the same time, it controls the transfer of energy by transmitting control packets to the base station, which contain information about adjusting the current of the primary winding, about the received energy, about the status of charging, about the completion of the transfer.

What is a wireless charging point?

Qi-charging is universal because it ensures the compatibility of mobile phones and different manufacturers. The only condition is that both parts - transmitter and receiver - must comply with the Qi standard.

Thus, any Qi wireless charger will fit any Qi mobile receiver, regardless of brand or model. Many cell phones from various manufacturers, including Samsung, Nokia, LG, Sony, HTC and Motorola, are already Qi-compliant and therefore can be connected to any charging station that meets its requirements. The number of compatible gadgets continues to grow as more and more companies support wireless power technology. This makes it possible to charge battery-powered electronics with a single power source.

How it works?

The mobile charger is not the latest invention. Electric toothbrushes have been using inductive power for many years. The process uses a resonant inductive coupling of the base station transmitter and mobile phone receiver. The primary coil continuously sends a test signal to the sender to check for a change in capacitance or resonance indicating the presence of a compatible phone. The transmitter modulates the charge and checks if the Qi wireless charging standard is supported.

Once compatibility and energy requirements are taken into account, the process of inductive energy transfer begins. In this case, the contact between the receiver and the transmitter is maintained. Once the battery is fully charged, they will go into standby mode. Universal charging is activated and transfers energy only if the connected gadget is on it.

Coils transmitting and receiving energy are specially shielded in order to reduce electromagnetic radiation.

The main features of the technology

• A method of non-contact power transmission from a base station to a mobile device, which is based on the near field magnetic induction that occurs between the coils.
• Transmission of about 5W of power using a suitable secondary coil (having a typical outer dimension of about 40mm).
• Operation at frequencies from 100 to 205 kHz.
• Support for two methods of placement on the surface of the base station:
  • guided positioning, where the user is assisted to correctly position the mobile device in a location providing power through one or more fixed points;
  • arbitrary placement on the surface of the charging station.
• A simple one that lets your phone or tablet take the lead.
• Significant design flexibility to integrate the system into a mobile device.
• Low standby power consumption (depending on implementation).

One for all

How convenient would it be to have one Qi-charger for all phones, players, cameras without a lot of tangled cables?

While countless new smartphones are sweeping the world, battery life is getting shorter. And every manufacturer and even every gadget has its own charger. And with each purchase, their number increases. Ultimately, the user is lost in a pile of various power adapters. Thanks to Q-technology, they become unnecessary, and tangled tangles of cables disappear, and this is not all the advantages of this technology.

Just as Wi-Fi became the global standard for wireless Internet connections and Bluetooth eliminated the need to hold your phone in your hand, so Qi is becoming the global standard for inductive charging of battery-powered gadgets.

Is electromagnetic radiation harmful?

Expert opinion is divided. On the one hand, many scientists confirm that a small amount of electromagnetic radiation from wireless charging does no harm. Others talk about the great danger to which the human body is exposed.

So how much electromagnetic energy is emitted by the Qi system? Very little. The Qi principle has been used in electric toothbrushes for many years without affecting people's health. The scheme of the charger is such that due to the small area of ​​​​its action, electromagnetic radiation is extremely limited. It exists only in the immediate vicinity of the wireless transmitting station and only when the gadget is on it. EMI is further reduced by additional shielding in the transmit and receive coils.

Wireless Power Consortium

The Wireless Power Consortium (WPC) was founded on December 17, 2008. At the same time, a unified program for the development of this technology was approved.

The Qi wireless charging standard ensures its versatility for all Qi-compatible electronic gadgets. This means that every device compatible with it can be charged at any Qi-compatible station. The WPS has 250 members including market leaders Samsung, Nokia, LG, Panasonic, HTC, Sony, Microsoft and Motorola, making it the largest association of manufacturers supporting wireless charger types.

As the number of Qi-enabled products increases, it's important to make sure every mobile charger works correctly with all Qi-supported gadgets, said WPC Chairman Menno Treffers. This is facilitated by a constantly updated database created by Testronic, which makes it easy to determine whether a new product will be compatible with previously certified products. The Qi wireless charging standard has become one of the most important technical developments for phone and tablet users, which are now used daily in work and life.