How to charge your phone with wireless charging. How wireless charging works

All tips

The battery remains the main weakness of a smartphone today, as it tends to discharge very quickly. The need to charge your phone every time through an outlet makes this indispensable modern world the device is less mobile and convenient. One way to solve this problem is to wirelessly charge your phone.

The term “wireless charging” is a metaphor, the purpose of which is to succinctly and clearly explain the key features and advantages of this device to the ordinary consumer. From a technical point of view, this gadget will be correctly called a Qi standard or PMA standard induction coil. Thanks to it, electrical energy is transmitted without the use of conductive elements. That is, in order to replenish the battery charge, you just need to place the smartphone on the device.

Wireless phone charging - how it works

To understand how wireless phone charging works, you need to remember the physics course from school. The operation of the device is based on the principle of electromagnetic induction. It is as follows: in a closed circuit, when the magnetic flux changes, an electric current arises that permeates this circuit.

In general, the process of transferring energy from the charger to the smartphone battery can be briefly described as follows:

When a device with a compatible energy receiver appears within the range of an inductive energy transmitter, that is, wireless charging, a special signal is sent. To do this, the smartphone must be equipped with a receiver, which is built in by manufacturers or can be installed by the user independently;
the signal activates the receiver and it begins to supply current to the induction coil, which forms a magnetic field around itself with a radius of approximately 4 cm;
device, which is a receiver, in turn, influenced electromagnetic waves, starts its own induction coil and begins to generate electric current;
the generated current is directed to the battery according to the operating principle of a conventional charger.

Today, wireless chargers are manufactured according to the specifications of the AirFuel Alliance and Wireless Power Consortium. Their main difference is the transmission frequency and connection protocol.

QI

The most widely used standard among smartphone manufacturers is the Qi standard proposed by the Wireless Power Consortium. It provides a charge with a power of 5 W, while the current is 2 A, and also transmits information about the charge level between devices. This allows you to control the strength of the current supply, as well as turn off the transmitting device if the smartphone battery is fully charged.

P.M.A.

The PMA standard from the AirFuel Alliance is less common, but some mobile device manufacturers use it. And some smartphones allow support for two standards at once, which is undoubtedly very convenient.

According to these standards, the distance between the receiver and the transmitter should be no more than 5 cm. That is why the smartphone must be placed directly on the wireless charger. Based on this, unfortunately, it will not be possible to charge several gadgets at the same time. You can learn more about all the operating features of this device by watching the video provided.

Advantages and disadvantages of a wireless charger

Photo: Koolpad Qi

Wireless chargers for smartphones have their advantages and disadvantages, which should be known to all those who decide to acquire this relatively expensive device.

Pros of use:

Undoubtedly, one of the main advantages that consumers look for when choosing this gadget is the absence of mechanical contact between the two devices. So, wireless chargers do not require a wire. Micro USB, which connects to the smartphone via a special connector. Typically due to frequent use such a connector very quickly becomes unusable, and as for the cable, it has a certain configuration and does not work with all devices;
A big plus is ease of use, because the process is fully automated. The two devices synchronize independently with each other. All the user needs to do is place their smartphone on the wireless charger without performing any other additional steps;
A wide variety of wireless chargers allows you to choose the most optimal device based on the user’s needs. For example, for those who spend most of their time driving, car chargers have been developed. They include holders, brackets and adapters. There are also charging stands. It’s convenient to watch movies, view email, chat with them. in social networks or surf the Internet. And those chargers that are built into tables, chairs or sofas are protected against moisture and dust4
Despite the fact that there is a widespread belief that such a wireless charger is harmful to health, this is not so. Manufacturers have tried to minimize the impact of electromagnetic radiation on humans.

Disadvantages of use:

It is worth saying that many of these disadvantages are due to the fact that the technology of wireless chargers is still very young and requires more detailed study and improvements.

Modern smartphones that support wireless charging

Manufacturers of mobile devices do not deny the fact that the use of wireless charging has many advantages, the main ones being practicality and convenience.

Companies such as Samsung, LG, HTC, Motorola, Nokia, Yotaphone build receivers into their top smartphone models. For less popular devices, separate receivers are provided, thanks to which the smartphone will also support wireless charging.

There is also a universal receiver that is suitable for any mobile device. It is intended for those whose mobile device does not provide the ability to use wireless charging. This receiver is a special film that is attached under back panel device or can be connected to a micro-USB connector.

There are also special receiver cases. This is a case that already has a receiver built into it electric current. It is enough to put it on your smartphone and the device can be charged via a wireless gadget.

Do-it-yourself wireless charging for your phone

Not everyone can afford the cost of a wireless phone charger. However, if you have the desire, skillful hands, knowledge of the basics of physics and the necessary parts, you can make a wireless charger at home. This is not as difficult as it might seem at first glance, because the circuit of such a device is quite simple. It consists of a transmitting circuit and a receiving circuit. The receiving circuit is a flat coil located inside the phone, and the transmitter is a small stand, inside of which the transmitting circuit is hidden. Thanks to induction, transmission occurs electrical energy from one circuit to another. The current arises in the second of them, is rectified by the diode and is transmitted directly to the battery.

So, to do wireless charging you need:

create a transmitting coil according to standard scheme blocking generator on one transistor. To do this, you need to wrap a frame with a diameter of 10 cm copper wire, the thickness of which is 0.5 mm. Moreover, you first need to make 20 turns, then make a tap by twisting the wire, and wind another 20 turns in the same direction. The transmitter can be used both field and biopolar;
create a receiving coil. It should be made in the form of a flat spiral. To do this, you need to wind copper wire with a diameter of 0.4 mm about 30 times. The resulting turns must be strengthened with super glue;
attach the take-up spool to the phone using double-sided tape;
directly connect the receiver to the battery through the SS14 diode, which is installed under the cover above the battery;
Carefully close the resulting structure with a lid so as not to damage it.

Having completed all these manipulations according to the instructions, the wireless charger will be ready for use.

Ready charging Samsung Wireless Charging Pad

Samsung is known for its high-tech and modern devices, so their wireless chargers are some of the best compared to models from other companies, although they will cost a little more.

Among them, it is worth highlighting the Samsung Wireless Charging Pad. main feature The device, which Korean engineers worked especially carefully on, is hidden in the name. The phrase “Fast Charge” literally translates as fast charging, which means that the smartphone is fully charged in 90 minutes. However, a significant drawback is that this function supported on only a few mobile devices, namely the Galaxy S6 E dge+ and Galaxy Note 5. Other smartphones are charged in normal mode. In addition, to take advantage of this function, you will need to spend additional money, namely, purchase a high-quality microUSB cable and a charging adapter from a network with support fast charging, which were not originally included in the kit.

The developers also took into account that during fast charging the panel itself and the phone overheat greatly, so a fan was built into the panel, which, although highly powerful, still works very quietly.

From others key features The model is also worth noting that the charging process occurs regardless of the position of the smartphone on the panel, which is undoubtedly very convenient. In addition, Fast Charge Samsung Wireless Charging Pad supports not only the WPC standard, but also AW4P and PMA.

The appearance of the Samsung Wireless Charging Pad is very attractive and stylish. The panel is made in round shape made of transparent polycarbonate. The inside is covered on both sides with a soft material that effectively prevents scratches on the phone and prevents the panel from sliding on the table. The cost is about 3 thousand rubles.

Wireless chargers For Apple smartphones

Photo: Wireless charging for iPhone

Apple appliances despite its popularity and large functionality doesn't support it yet wireless technologies charging. However this significant drawback can be eliminated using special additional devices, for example, iQi receiver cards Wireless Charger. It is easy to use, oversized and fits under any standard case.

iQi Wireless Charger is base station and an induction coil made in the shape of a thin plate. This plate is connected to an Apple smartphone via the lightning connector. For additional fixation, the kit includes a special case that tightly presses the plate to the back panel of the iPhone.

The device guarantees stable and reliable operation, as well as fast charging of the device, despite the fact that the induction coil has not passed the Made for iPhone certification. The cost of iQi Wireless Charger starts from 2,500 rubles.

Charging Nokia DT-910

Wireless charging for Nokia phone DT-910

Wireless charging for the Nokia DT-910 phone, supporting NFC interface, will become good option for owners Nokia smartphones Lumia series, as it allows you to charge your smartphone quickly and efficiently.

This device stands out from a number of other similar devices in that it charges the phone vertically, serving as a stand. This is very convenient, as you can watch videos, listen to music, chat with friends without interrupting the charging process. The device is placed on a stand in such a way that the user will see everything that happens on the screen.

The external design of the device is modern and stylish. The stand is made of durable plastic that can withstand falls and other mechanical damage. In addition, it is made in three variations: where the panel comes into contact with the phone it is rough, which prevents scratches, where it comes into contact with surfaces it is matte, so it does not allow slipping, basically it has a pleasant glossy shine. The model comes in two colors – black and white, which allows it to easily fit into any interior.

The cost of Nokia DT-910 will be affordable for many average users, as it belongs to the average price segment and amounts to 2400 rubles.

Brando Wireless Charging Pad

Wireless phone charging Brando Wireless Charging Pad refers to budget devices, however, it has quite good quality and performance. It’s worth noting right away that the device is not made of the most durable plastic, so it requires careful handling. However, as for the assembly of the device, everything is at the highest level.

The charging process with the Brando Wireless Charging Pad is quite simple, but has its own nuances. So, the smartphone will not charge until it accepts correct position, namely in the center of the panel. This, of course, is not entirely convenient. But the developers tried to reduce this oversight in the device to a minimum, so if something happens, a special indicator will always tell you that the phone is placed incorrectly and will start blinking green.

The phone charges quite quickly, in two to three hours, which is an undoubted advantage of this model. You can buy Brando Wireless Charging Pad for 2 thousand rubles.

Wireless charger q8

photo: Wireless charger q8

The Q8 wireless charger was released after the sensational Q 5. It absorbed all the best features of the previous model, but became more modernized and convenient.

Q8 is universal and suitable for all smartphones that have a built-in Qi receiver or an external receiver. The model has many advantages, among which it is worth highlighting a more powerful transmitter and 2 USB input, as well as an increased contact area.

Charging is quick and easy. The user is notified of the charging status by special red and blue indicators, which make it clear whether there is contact between devices, whether the charging process is in progress and when the smartphone battery has a 100 percent charge.

The device has and quite stylish design, which will certainly fit into any interior. It is made in white from durable and high quality plastic, which is resistant to various mechanical damage. This wireless charger is quite compact, so it is convenient to take with you. The cost of this model starts from 2 thousand rubles and will be affordable for the average consumer.

div class="row aliexp">

In order to equip your favorite smartphone with the flagship wireless charging function, you don’t need much.

Firstly, the base, also known as the charger. Most often it is made in the form of a small round platform with an outlet for a charger. For the experiment, let's take an unnamed model with a pleasant blue backlight. Powered by a 5 V, 2 A power supply ( regular USB), is powered via a standard microUSB port. At the output, the device produces a current with parameters of 5 V, 1 A, which is enough to charge most devices even in operating mode.

Second necessary element modernization - an antenna, with the help of which the smartphone is charged from a distance. Usually this distance is minimal, by the way, but the convenience of using wirelessly can be significant for someone. For example, the database can be embedded in dashboard car or put it on the chest of drawers near the bed: came, put it down, went to bed. And no searching for wires.

There are a lot of different universal antennas for smartphones on the market. They are also suitable for other equipment, but here you need to think about placement. The antenna (we have an unnamed Chinese copy) is a coil with a circuit board hidden in a paper-like envelope. A wire with a microUSB plug comes out of it, although if desired, it can be soldered to any other one. It is worth paying attention: the coil only works in one position in relation to the charger. Since the cable for connecting to a smartphone is flat, you may need to open the bag and flip the coil over for the antenna to work (as in our case). The coil should face the open side towards the charger.

Attention: the charging base shows the necessary parameters of the power supply (in the case of the used one - 5 V, 2 A). They need to be provided for. At lower current levels, charging will occur very slowly. For adequate operation, you may need to replace the cord included with the charger, since not every USB cable can pass a full 2 A. As you can see,

Hello, dear readers. I'm sure you've heard, at least remotely, that you can charge your phone without using wires. Surely many dismissed it, thinking that such modern technology is only available in very expensive devices. But no.

Almost any phone supports wireless charging, although with some reservations. Branded smartphones can receive energy through the air right out of the box, but for others you will have to purchase special accessories. Today you will not only find out whether your mobile phone supports wireless charging, but also how to ditch the 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 energy transfer is not such a complex technology as it seems at first glance. IN technically wireless charging is represented by two copper coils.

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

The device's battery receives energy thanks to the magnetic field that occurs when the receiver is in the field of action 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 energy over a distance of up to 4 centimeters. Scientists, when creating the standard, used developments that had already been made by many other specialists.

In general, the idea of transmitting energy over a distance appeared two centuries ago, when Marie Ampere discovered a law proving that electric current produces a magnetic field. A significant contribution was made by Nikola Tesla, who built a tower to demonstrate wireless energy transfer. Subsequently, many organizations and scientists studied technology, but large percentage experiments ended in the early stages.

Until this century, wireless energy transmission remained at the testing level. Until the technology became interesting large manufacturers 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 companies was the fact that the standard was free and accessible. Today almost everyone flagship smartphone boasts the presence of technology, and the budget one boasts accessories that make the function work for them.

Not a dozen companies are working on energy transmission technologies other than 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, Soviet scientist Semyon Tetelbaum described in an article the possibility of transmitting energy using microwave radiation. Subsequently, this technology was actively developed. Energy can be transmitted with a laser beam, which NASA has proven in experiments. Nikola Tesla, known for his experiments with electricity, even believed that it was possible to create a worldwide wireless system, which will save people from power lines.

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

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

To date, more than 80 smartphones have received wireless charging using the Qi standard, not counting a number of smart watch 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 (list 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 3 XL

HP

HP Elite X3

HTC

HTC Droid DNA
HTC Windows Phone 8X

Huawei

Huawei Mate20 Pro

Kyocera

Kyocera Brigadier
Kyocera DuraForce
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 950 XL
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

mPhone 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 Edge 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

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

The smartphone models presented in the list only require the presence of a platform that is necessary for transmitting energy. As a rule, it is included with the mobile device, but not always. In this case, you will have to purchase a docking station separately.

Usually, the manufacturer produces a branded model, but you can use others - there is no special connection between the smartphone and a specific site. You can even order a cheap “noname” docking station, which in most cases will satisfy the buyer’s needs.

What to do if your smartphone does not support wireless charging

If you don’t find your device in the list of supported smartphones, don’t 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) for wireless charging are specially produced. This list includes quite popular, but rather outdated models. There are exceptions, such as the iPhone 7.

Both popular and not outdated, and the manufacturer did not integrate the receiver. Receivers intended for certain models are designated accordingly, as well as required characteristics. For example, similar receivers for Samsung Galaxy S 5 or older solutions have unusual contacts, corresponding to those under the cover of the devices. Here are the most popular models who received special receivers:

iPhone: starting with “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 special connection. In addition to boards (receivers), there are also special cases on the market for wireless charging of devices, which contain a copper circuit inside. For each smartphone, a correspondingly shaped case is made.

Universal solutions

There are more and more devices supporting wireless charging, but manufacturers are in no hurry to “import” the technology into 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 set costs about 500-700 rubles (you can find it cheaper), the main thing is to choose the right one for your smartphone. 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, we figured out the support for wireless charging on smartphones. Now I would like to dwell separately on the platforms that are used to transfer energy to the device. For what?

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

Particularly popular is the wireless charging dock from Samsung, made in an oval shape. It is suitable not only for charging the company’s smartphones, but also for most other models.

Among the features worth highlighting is support automatic shutdown when the device is fully charged, as well as a light indication. The average cost is 2,000 rubles, but in Chinese online stores you can find a cheap replica for 400-700 rubles.

The Woodpuck FAST Edition Bamboo playground model, which is made of wood, is also interesting. The manufacturer, so to speak, has combined modern technologies and natural materials. The functionality is no different from other docking stations, but it looks catchy. Cost – 40 dollars.

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

Photo: Designo Curve MX34VQ

Some unusual wireless charging stands include: new TV from Asus – Designo Curve MX34VQ. More precisely, the leg on which it 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 is steep.

Bottom line

It's safe to say that the list of devices that support wireless charging will only grow. A technology that can eliminate a lot 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, a dozen companies are working on developing even more advanced technology that will not be tied to a docking station. For us, ordinary users, it remains to wait a little to forget about main problem portable devices– attachment to the outlet.

Situations arise when the cable for charging a gadget cannot provide power due to the fact that there is no outlet or there is no electricity. Then a wireless phone charger will come to the rescue, it works autonomously and does not take up much space.

How does a wireless phone charger work?

The operating principle of the device is based on QI technology. It involves the absence of wires or the use of contacts; its operation is based on the action of electromagnetic waves. The question of how wireless charging works can be answered - according to the principle of an inductive coil, a magnetic circuit. The device consists of 2 coils - transmitting and receiving, the first is needed to create electrical magnetic field, and the second is for current. Interacting with each other, they create a current through the transmitter, receiver, stabilize it, bringing it directly to the smartphone.

To charge your phone, you just need to place it on a special stand. Charging can be carried out and maintained anywhere - at home, in the car, taken with you on trips or long trips. Some countries install similar devices in cafes, when a person arrives there, and while waiting for an order, charges the phone. It turns out simple, fast, convenient.

What are the advantages of a wireless charger?

The advantages of the charger include:

ease of use when it can be used at home, in the car or in a cafe;
the ability to charge several gadgets at the same time;
phones with wireless charging are increasingly being released;
the charge is made at a distance of up to 4 cm or closer;
charging consumes the minimum possible energy;
its electromagnetic field is safe for humans;
for some models it is sold immediately as a set with a cell phone, so as not to buy additionally;
automatically turns off when reaching 100% charge;
low cost, long term suitability.

How effective is a wireless phone charger?

Wireless phone charging is not without its disadvantages:

Through it you can recharge only certain models of gadgets. So, you can’t charge an iPhone through it, but you can charge a Samsung Galaxy or Nexus.
To charge some smartphone models, you will have to buy a special case through which the process will be performed. This includes certain costs.
Wireless phone charging charges at a slower rate than when in use standard cable.
While charging, the device and gadget become very hot.
When charging, the mobile phone may receive distorted radio signals.

Where to buy and how much it costs

Portable phone chargers are sold in regular electronics chains or online stores. The range of prices in electronics stores varies depending on the manufacturer: for universal chargers the cost ranges from 2 thousand to 2500 rubles, for branded ones - from 3 thousand rubles. In online stores you can buy a device much cheaper: for universal ones they ask from 900 to 2 thousand rubles, but branded ones are not sold or are offered at the same price as in large networks.

For those who want to save money, there is the option of making such a device with your own hands. If you are well versed in electronics and radio engineering, then it will not be difficult for you to find manufacturing diagrams that are on the network or available sources, purchase parts, and make your own device. A self-made charger will cost less, and will work no worse than the factory one.

Video: DIY wireless charging

Today it is already difficult for us to imagine our life without mobile gadgets. This has led to a huge number of wires accumulating near household outlets, among which it is not so easy to find the necessary “charging”. In this case, a wireless charger will help solve the problem. The principle of its operation is very simple - just place the gadget on a special panel for it to charge. The accessory is based on the operating principle of an induction coil. This technology is called Qi. She is becoming very popular in Lately. In 2015, the globally popular brand began selling furniture that would have a wireless charging module built into it. Today, all flagship smartphone models support Qi. It is expected that transmitters, or, in other words, modules, will soon be found in airports, restaurants, cinemas, fast foods, shopping centers, which will allow you to charge phones and tablets at any time. In fact, this will make life easier for users of mobile gadgets. We are entering a new era where it is not necessary to carry everything with us everywhere for all the devices we use.

Wireless chargers for gadgets with support for Qi technology

The wireless power standard is called Qi. In Russian the word is pronounced “Qi”. The standard bears this name in honor of the term of Eastern philosophy. It is developed by the Wireless Electromagnetic Power Consortium WPC. This organization unites global electronics manufacturers and sets itself an important task - to standardize the process of charging gadgets using the induction method.

In the near future, all devices will be able to be charged without connecting to the network. It's incredibly convenient. Each of us has at least once encountered a situation where... We have to urgently look for a way out. Wireless charging modules will soon appear in all in public places, as well as at home for each user. At home, you can simply place the module in a convenient place, and it will never get lost, unlike wired “charging”. You just need to place the gadget on it and wait a bit until the battery capacity is replenished.

The operating principle of wireless “charging” is based on the properties of an induction coil to transmit electric current. In a school physics course, we were taught that when an induction coil is connected to a power source, a magnetic field arises in it, perpendicular to the turns of the coil. Thus, if you place two coils within the range of a magnetic field and at the same time connect one of them to a power source, then voltage will appear in the second coil. It is important to take into account the fact that the two induction coils should never touch each other. This simple principle is used in the operation of wireless chargers that support Qi technology.

There are two varieties of the Qi standard. The first involves charging at low power - 5 watts, and the second - at high power - 120 watts. High-power Qi is currently not produced by manufacturers due to objective factors. Using Qi at 120 watts, you can charge your laptop. Qi at 5 watts is used to replenish capacity and phones. It should be noted that tablets and smartphones require different amperages. A wireless phone charger produces a current of 1 ampere, and for tablet computer- 2 amperes. When choosing an accessory, be sure to pay attention to these characteristics.

Energy efficiency of the Qi standard

A modern wireless charger consists of two components. One of them is built directly into the gadget, which supports Qi and is called a wireless charging receiver. Essentially, it is a receiver that conducts electrical current to the battery. The second component is called the transmitter. If you mean buying a wireless “charging”, we are talking about a transmitter. They come in a variety of shapes and sizes. The most common types are round and rectangular transmitters.

To better understand how wireless charging works, you should consider that a magnetic field can transmit not only electric current, but also data about bytes and bits, which the developers of the Qi standard took into account. Interaction between the coils will occur only at the moment when the gadget with a built-in transmitter is close to the transmitter.

If the accessory for charging the gadget operates in the background, then the pulse sent every 0.4 seconds by the transmitter will not change the voltage in the coil built into the transmitter. We can conclude that a modern accessory can recognize in which mode to operate. As soon as a smartphone is nearby at a distance of several centimeters, the voltage in the induction coil will drop sharply and the device will switch to active work. As soon as the smartphone battery is charged, the corresponding signal will switch the charger to background mode. We can conclude that modern wireless accessories for replenishing battery capacity are energy efficient.

Is Qi technology safe?

Some users mistakenly believe that Qi wireless charging may be harmful to health. The fact is that magnetic radiation is not ionizing. In its effect on the body, it is similar to a mobile phone signal, a radio signal. In this case the signal mobile network, which comes from the tower, is stronger and has a continuous nature, while electromagnetic radiation disappears immediately after charging the smartphone battery.

The power of wireless chargers is 5 watts. It is not enough to have an effect on the human body. We can talk about a negative impact only if the power of such devices is 120 watts. But such models are not produced on an industrial scale. This explains the lack of wireless chargers for laptops. It is important to know that wireless battery charging technology has long been used in many models of electric shavers and electric toothbrushes, which once again proves its safety.

Which smartphones support wireless charging?

First of all, we want to note that not all gadgets today support the wireless charging function. Apple Company intentionally markets products that are not Qi compatible. In this case, we recommend purchasing a special case with a built-in induction coil.

Flagship devices generally always support Qi technology. These include such popular smartphone models as Samsung Galaxy S6, Sony Xperia Z4v, Samsung Galaxy S6 Active, Google Nexus 6, Motorola Droid Turbo, Nokia Lumia 930, Samsung Galaxy S6 Edge. Already, dozens of models of the most different manufacturers can be charged using a wireless accessory, which provides maximum ease of use for users.

Is it possible to make wireless charging yourself?

Wireless chargers are quite expensive, considering that they are a regular induction coil. The question arises: “How to make a module with your own hands?” Basically, if you have knowledge of basic physics and special equipment to measure the strength and power of electric current, this will not big problem. Fans of radio electronics are capable of assembling even different ones. simple devices, But ordinary users We do not recommend conducting such experiments.

On the aliexpress.com website you can find separate wireless device receivers for some smartphone models, including the , Google Nexus line. It is quite easy to install it on your phone. Under the cover of the device there are two contacts, which provide a positive and negative pole. All you need to do is buy and connect the receiver, after which you can conduct a wireless charging test. This solution is optimal if you somehow got a wireless charger, for example, you were given a gift, and your gadget model does not yet support the Qi function.

Wireless battery charging technology is gaining increasing popularity in the modern world. In the future, it will be possible to replenish the battery capacity in many public places. Expected to be wireless chargers stadiums, parks, restaurants, cinemas, fast food will be equipped. When purchasing smartphones, we recommend paying attention to support for the Qi function, which is present in all flagship models 2015.