Wireless charger. How wireless charging actually works and where to find it

Wireless charger appeared several years ago. Modern manufacturers phones, tablets and other gadgets use technology to replenish battery capacity. Buyers note the ease of use of this product.

The principle of operation of the device

For charge Samsung smartphones, iPhone, Sony and other brands often use dedicated docking stations without electrical cables. The principle of operation of the device is simple. The phone is placed on a special panel to replenish the battery capacity.

The principle of operation of the product is to use an induction coil. The use of such charging is safe for humans. No wire reduces risk electrical circuit.

In 2015 Swedish company IKEA has started selling furniture with a built-in wireless charging module. Flagship phone models - Samsung, Sony, Xiaomi, Lumia - support Qi.

It is expected that soon charging stations without electrical wires will appear in airports, restaurants, cafes, shopping and entertainment centers, cinemas. This will allow you to quickly charge gadgets at a convenient time for the owner.

The standard for a product designed to replenish battery capacity is named after an Eastern philosophy term meaning the flow of energy. Developed by an organization that brings together global manufacturing companies electronic products. The consortium set itself the task of standardizing the process of replenishing the battery capacity of smartphones by induction.

Induction coil used in modern devices without electrical wires, invented. The scientist proved that when it is connected to a power source, a magnetic field arises.

The principle of operation of such products that support Qi technology is simple. Two coils are located in range magnetic field. One of them is connected to the power supply. Voltage is applied to the second coil. Important condition- the coils do not touch each other.

Wireless charging consists of two modules. The first component is built into a smartphone or tablet. The module is called a receiver or receiver. Component conducts electricity to the battery of the gadget.

The second component is the transmitter. The transmitter may have a different shape and size. Demand from buyers are round and rectangular chargers.

Qi transmission technology is able to charge a phone located at a distance of 4 cm from the transmitter. Many buyers are interested in how charging works. After installing the smartphone on the stand, the magnetic field is utilized and charges the device.

The power of wireless products does not exceed 5 watts. The magnetic field is non-ionizing. It does not affect the human body. Action similar WiFi signal or mobile communications.

Products with a power of 120 watts are capable of influencing the human body. Use them to replenish the tank battery laptops. IN industrial scale they are not issued. A similar charge technology is used for electric razors and toothbrushes. This proves the safety of the devices.

Perspectives and models that support the technology

The main problem with transmitters is their short range. A lot of research has been done to increase the potential of the device. Many of them have been successful. Microwaves and laser powerful options inductive charge transmitted over long distances. Their disadvantage is powerful radiation, which can harm a person.

Apple Corporation patented a product that allows you to charge smartphones at a distance of up to 1 meter. Intel is already working on a magnetic field technology that fits into laptops and is capable of transmitting power to various peripherals.

branded Samsung already Released docking station for recharge battery charging. The device comes with the Galaxy S7 model. For other devices of this brand, you need to select and purchase a special platform in order to use this method of replenishing battery capacity. If the smartphone model does not support the technology and is not equipped with a built-in receiver, then use covers or special stickers on them.

Universal wireless chargers use for phones:

• samsung galaxy S3, S6, S7, S8 different modifications;
• Luma;
• Lenovo;
• iPhone.

Time full charge battery life is 2.5 to 3 hours. It is determined by capacity. New in 2016 is car charging.

You can make the device yourself if you have ideas about electric current and wires. To create a transmitter without cables with your own hands, you will need copper wire and diodes.

The body of the product will be a plastic box. Transistors (field or bipolar) are required. They will reduce the charging time of the smartphone. Tools, scissors and glue that everyone has will come in handy.

To use the transmitter without cables, you can install a universal receiver. It is a connector or plate. The receiver is fixed to the charging port and fixed with a cover. Using a soldering iron, the receiver is hidden under the back cover of the phone.

The approximate price of the receiver complete with the transmitter is 700 rubles. You can use the device for any phone models that support Qi technology.

On purchase original charger without cables it is better not to save. Latest Models smartphones are equipped with a docking station and a receiver. Breaking this device bears additional financial costs. It is advisable to give preference to proven manufacturing companies. This reduces the risk of station overheating, power surges or overcharging.

Advantages and disadvantages

Wireless battery charging technology is not another unnecessary function modern smartphone. The responsible approach of the manufacturer makes it popular among phone users various brands and models. Gadget charging points appear in in public places. Gradually, manufacturers relieve electronics buyers from numerous cables in the house.

The advantages of using wireless charging technology are:

• No need for a cable to connect your smartphone and adapter. It is enough to replenish the battery capacity by bringing the gadget to a platform specially designed for this or placing it nearby within a radius of 4 centimeters.
• Apple products allow you to charge multiple devices at the same time. Modern smartphone models require the purchase of an additional adapter when using this method of replenishing battery power.
• The minimum number of cords and wires in the house.
• The docking station is convenient to carry around. But you can also use the transmitters of work colleagues or household members.
• No need to connect to the electrical network.
• The inability to forget to put electronic device for charging.
• Receiver invisibility. Furniture manufacturers mount docking stations in armrests, so that the charger fits perfectly into the interior and does not take up much space.
• High rate of replenishment of the battery capacity.

A huge plus is the ability to quickly and conveniently place the device for charging. By placing the receiver on the kitchen table, coffee table or near the bed, and placing the phone there, you can constantly maintain the battery level at 90-100%.

The product connects to a smartphone without special cable. In this case, the charging itself is connected with a wire to electrical outlet.

The disadvantages of products for replenishing battery energy include cost. They usually cost more than standard chargers. Approximately their price is 2-3 times higher. In spite of this this technology attractive to users. Car charger is a practical solution.

Many people use electrical devices. Using products without wires to replenish battery capacity allows you to quickly cope with the task. They do not harm human health, decorate the interior, and are convenient to use. A person using a smartphone will definitely appreciate the practical solution in the form of wireless charging, which you can take with you to work or travel.

Every family is familiar with the situation when all sockets are occupied with wired chargers for smartphones and other devices. mobile gadgets. Qi technology is simple and effective solution this problem. Wireless charging will allow you to freely use your phone, work without restrictions while traveling. That is why smartphone manufacturers are actively implementing the technology when developing new models. Latest iPhone versions have the Qi standard - energy transfer using magnetic induction.

Price and where to buy

In online stores in Russia that sell smartphones and related products for mobile phones, you can buy at favorable price wireless charging Qi with delivery. A wide range of such devices is offered by companies such as Samsung, Baseus, HOCO, WIWU. The cost of charging panels varies in a wide range depending on the parameters:

• manufacturing technologies (they can be made, for example, in the form of a rug or stand);
• functionality (there are models that allow you to charge 2 gadgets at once, are equipped with “smart” LEDs with the ability to turn off the indication);
• method of fixing the phone ( advanced users it is recommended to choose models with a rubber ring that prevents slipping and accidental falling of equipment);
• the number of induction coils (this fact does not affect the charging speed, but the panel is more convenient to use, since it will not be necessary to look for the place where the coil is located in order to place a smartphone on it).

How much does wireless charging cost:

• Moscow - 2990 rubles.
• St. Petersburg - 2990 rubles.
• Yekaterinburg - 2990 rubles.
• Omsk - 2990 rubles.
• Ukraine, Kyiv - 1399 UAH.
• Dnepropetrovsk - 1399 UAH.
• Gomel - 99 Belarusian rubles.
• Almaty - 17990 tenge.

How does wireless charging work?

To use wireless power transmission technology, special induction electromagnetic coils are needed both in the phone and in the charger. In the first case, it acts as a receiver, in the second - as a transmitter of electricity. When the charging panel is connected to the mains, voltage will appear in the coil, and a magnetic field will appear in the entire radius of its action.

When the phone is placed in this field, the smartphone's receiver converts electromagnetic waves into electricity by induction. In accordance with the WPC standard, this law works when the distance between the phone and the panel does not exceed 4-5 cm. Thus, the gadget will be charged at an efficiency of 75-80%. This is somewhat less compared to wired versions, but the transfer technology allows you to replenish the spent battery energy faster.

How to make a wireless charger with your own hands?

In practice, knowledge of physics, electronics and electrical engineering allows you to make a wireless one with your own hands. Most often, a blocking generator circuit is used to solve this problem. It is better to use it for several reasons:

• she is simple;
• does not require additional configuration;
• works with high efficiency;
• uses wide range stresses.

The transmission circuit consists of a coil feedback, loop circuit and indication circuit. For their etching, it is recommended to use a 2-sided foil fiberglass with a thickness of 1.5 mm. But there is an easier way to make it: the role of the transmitter inductive charging a copper wire with a diameter of 0.5 mm can play (40 turns wound on a frame with a diameter of 7–10 cm), a transistor is connected to the end (the value in this case does not matter). You can use a CD box as a case. The transmitter is ready!

If a direct conduction device is used, it is necessary to reverse the polarity when connecting.

The Qi standard receiver features a flat appearance. For the coil, copper wire 0.3–0.4 mm is used. It is wound on a plastic base with 25 turns (they can be fixed with superglue). For connection, it is better to use a high-frequency silicon diode, which is attached to the battery. A capacitor is used to stabilize the voltage.

To charge smartphones, you will need a connector that can be connected to the receiver and directly to the battery. But keep in mind that the gauge showing the battery level will not work. After completing the procedure, just close the lid. The device will start working if you put it on top of the transmitter.

Which phones support wireless charging?

Individual models smartphones come with built-in Qi. The ability to use the technology is available Samsung owners(Galaxy S6 Edge, Galaxy Note Edge, Galaxy Note 4), as well as Motorola Droid Turbo, Google Nexus 6 and others. For models that do not initially support this standard, a special receiver will be required with the replacement of the phone case or its back cover. When choosing components, it is important to consider their compatibility with a particular gadget model.

Additional items:

Today, it is already hard for us to imagine our life without mobile gadgets. This has led to the fact that near household outlets accumulates great amount wires, 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 to charge it. The accessory is based on the principle of operation of the induction coil. This technology is called Qi. She becomes very popular in Lately. In 2015, the globally popular brand began selling furniture that will have a built-in wireless charging module. Today, all flagship smartphones support Qi. It is expected that soon transmitters or, in other words, modules can be found in airports, restaurants, cinemas, fast foods, shopping malls, 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 new era, where it is not necessary to carry around with you everywhere for all the devices that we use.

Wireless chargers for Qi-enabled gadgets

The wireless power standard is called Qi. In Russian, the word is pronounced as "Qi". The standard bears such a name in honor of the term of Eastern philosophy. It is developed by the Wireless Consortium electromagnetic energy WPC. This organization brings together world 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 can be charged without being connected to the network. It's incredibly convenient. Each of us at least once faced with a situation where. We urgently need to find a way out. Soon, wireless charging modules will appear in all public places, as well as at every user's home. At home, you can simply place the module in a convenient place, and it will never get lost, unlike wired "charging". It is enough just to place a gadget on it and wait a bit until the battery capacity is replenished.

The principle of operation of wireless "charging" is based on the properties of an induction coil to transmit electric current. IN school course physicists taught us 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 the magnetic field and at the same time connect one of them to a power source, then voltage will appear in the second coil. In this case, it is important to take into account the fact that two induction coils should in no case be in contact with each other. Such a simple principle lies 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. Qi high power is not currently produced by manufacturers due to objective factors. With Qi at 120 watts, you can charge your laptop. Qi at 5 watts is used to replenish the capacity and phones. It should be noted that different current strengths are required for a tablet and a smartphone. The wireless charger for the phone creates a current of 1 amp, and for tablet computer- 2 amps. When choosing an accessory, be sure to pay attention to such characteristics.

Qi Energy Efficiency

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

To better understand how wireless charging works, it should be noted that the magnetic field is capable of transmitting not only electric current, but also data on bytes and bits, which was taken into account by the developers of the Qi standard. The interaction between the coils will only occur when the gadget with the built-in transmitter is close to the transmitter.

If the accessory for charging the gadget works 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 function. 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 mode. As soon as the smartphone battery is charged, the corresponding signal will switch the charger to background mode. It can be concluded that modern wireless accessories for battery replenishment are energy efficient.

Is Qi technology secure?

Some users mistakenly believe that the Qi wireless charging function can 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 communication signal, a radio signal. At the same time, the signal mobile network, which comes from the tower, is stronger and has a continuous character, 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. ABOUT negative impact we can only speak if the power of such devices is 120 watts. But similar models are not produced commercially. This explains the lack of wireless chargers for laptops. It is important to know that technology wireless charge The battery 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 charge function. Apple Deliberately brings products to the market that are incompatible with Qi. In this case, we recommend purchasing a special case with a built-in telecoil.

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

Can you make your own wireless charger?

Wireless chargers have enough high cost, given that they are a conventional induction coil. The question arises: "How to make a module with your own hands?". In principle, if you have knowledge of the basics of physics and special equipment to measure the strength and power of electric current, this will not be a big problem. Fans of radio electronics are able to assemble and not so simple devices, but ordinary users we do not recommend such experiments.

On the site aliexpress.com you can find separately receivers wireless devices for some smartphone models, including the line, Google Nexus. It's easy enough to install on your phone. Under the cover of the device there are two contacts that provide positive and negative pole. It is enough to 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 presented with a gift, and your gadget model does not yet support the Qi function.

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

Greetings, dear readers. In today's article, let's talk about the current technology today - wireless charging for phones. Surely you have heard how branded companies focus on it, presenting the next portable device with his support. Not wanting to spend their money, many people stay with their old mobile phone, never ceasing to dream of trying out wireless charging.

DIY wireless charging - very simple and enough fast decision. Read the instructions and watch the video. Interesting, right? Then let's go in order. But be sure to read the advice at the end of the article!

Something new? No, the well-known "old"

When I first saw wireless charging, I thought that the manufacturers had made a breakthrough by opening some new technology. Fortunately, there is the Internet, which told me the truth. In fact, the advent of wireless power transmission was made possible by the discovery of the law by André Marie Ampère, who proved that an electric current produces a magnetic field.

And it happened, for a moment, almost 200 years ago. In subsequent years, a number of scientists confirmed the existence electromagnetic waves, and Nikola Tesla devoted years of his life to studying the possibility of transmitting energy at a distance. Through electromagnetic induction the physicist managed to light an incandescent lamp at a distance.

Standard qi

Of course, wireless transmission energy was of interest to many areas human life, but long time did not go beyond the walls of the laboratories. Already in this century, companies that develop consumer electronics (tablets, smartphones) have begun to take initiatives to create wireless chargers. A huge contribution was made by the Wireless Electromagnetic Energy Consortium ( Wireless power Consortium), which developed the Qi ("Qi") standard for small currents.

The specification of the standard was free and available, so very soon it began to be used in portable technology. Three years later, Qi acquired a specification for medium currents. There are other standards, but they are more complicated than Qi, and less common. More recently, in 2015, scientists at the University of Washington found out that energy can be transmitted through Wi-Fi networks. We are waiting for the smartphone to charge by connecting to the router.

How Qi wireless charging works

Well, already from the name of the device it becomes clear that the gadget does not require wires to transfer energy. The principle of operation is very simple. The charger receives a built-in coil (copper), which takes on the role of the creator and transmitter of the electromagnetic field already on the receiver coil laid in the smartphone (maybe above the battery or back cover). Electromagnetic radiation occurs when mobile phone with the receiver is in close proximity to the transmitter (usually about 4 centimeters). Then capacitors and a rectifier (low-power semiconductor diode), which provide energy to the battery.

So, I can do wireless charging with my own hands?

Yes, this does not even require special knowledge in electrics. Moreover, already before us, enthusiasts conducted similar experiments, laying out detailed instructions and schemes for assembling wireless charging with your own hands. If all the necessary components are at hand, then creating the simplest wireless charging will not take an hour. However, we recommend that you first practice on the old “buttons”, and not run to “invent” charging for a brand new iPhone. For example, you can assemble such a thing for your Nokia, in which the charging socket has fallen off, reanimating it in this way. So let's get started.

Instructions: how to make a wireless charger for your phone with your own hands

The whole process can be divided into two parts: the manufacture of the transmitter and receiver. The first component will separate device, and the second one will be installed in the phone.

The wireless charging circuit is very simple, it consists of two coils (transmitter and receiver), as well as a transistor and a resistor.

Transmitter device:

1. To begin with, we take a frame, the diameter of which should be 7-10 centimeters, but another one is possible - at your discretion.
2. Now you need a copper wire with a diameter of 0.5 mm. We wind it on the frame. It is necessary to make 20 turns, then make a tap and twist another 20 turns in the opposite direction.
3. You need a transistor. You can use any, even polar, even bipolar - there is not much difference. If there is direct conduction, then you will have to change the polarity. The transistor is connected to the end of the coil and tap.
4. We fasten the resulting structure with adhesive tape or other type of insulation. To make everything look “solid”, you can use boxes from a DVD or CD. Some craftsmen even bother by carving, so to speak, cases out of wood.
5. To provide power, you can use standard adapter 5 volt power supply, which is connected to the circuit.
6. Everything, the device that will transmit electricity is ready.

Now let's move on to making the receiver:

1. If the manufacture of the transmitter takes a matter of minutes, then the receiver will have to sweat. First you have to make a coil, but already flat. You will need copper wire, but with a smaller diameter - 0.3-0.4 mm. You will need to make 25 turns. For convenience, I advise you to use some kind of lining, such as a piece of plastic. We gradually strengthen the turns with superglue so that the structure does not fall apart - you have to wind it again. At the end of the work, it is necessary to carefully tear off the receiver from the plastic on which it was wound.
2. Now we connect our receiver to the battery through a high-frequency silicon diode, for example SS14. The coil should be on top of the battery, closer to the cover. A capacitor should be used to stabilize the voltage.
3. You can connect the receiver either to the charging connector or directly to the battery. Last option perfect for users whose charging port has "died".
4. Everyone, close back cover so as not to move the coil.

For many users, I think a video on how to make wireless charging with your own hands will not be superfluous. So here you go:

This DIY wireless charger is ready. To start using, just put the phone on the transmitter. TO today Not a dozen instructions for assembling wireless chargers have already accumulated on the Web. The principle is about the same, but enthusiasts continue to improve this device, introducing something of their own. True, it is better for beginners to practice for a start on the very simple version, presented in the instructions, so that you do not have to carry the phone for repair.

Suitable for any device

The most important plus of do-it-yourself wireless charging is the ability to make it for almost any device: a smartphone, regular phone, camera, radio and so on. The principle of power supply of all these gadgets is similar, therefore, charging occurs according to the same scenario.

True, I strongly do not recommend trying to make wireless charging with your own hands for expensive smartphones. First, you will have to disassemble the case in order to connect the receiver coil, since modern models often made non-separable (it will not work just to remove the cover). Secondly, you run the risk of confusing something and ruining the device, especially for beginners. Thirdly, most modern smartphones support wireless charging from the factory or are provided by other manufacturers.

Cons of do-it-yourself wireless charging

Slowly we came to a very important point- cons of homemade wireless chargers. Yes, the opportunity to do something interesting and useful device- great, but let's not forget about the risks you take.

• Errors during production best case will lead to the fact that wireless charging will not work, at worst, the phone will not work.
• Don't expect your smartphone to charge quickly. Even factory wireless chargers still lag behind conventional chargers in terms of charging speed, to say nothing of DIY ones.
• I don’t think that every house has a coil of wire, a diode and a couple of transistors. You will have to buy all this, spending an amount comparable to that required to buy a ready-made, albeit Chinese, device.

What can be added? Do-it-yourself wireless charging is rather a way to visually look at the principle of the electromagnetic field. To collect really worthwhile and beautiful device, it will take a lot of time, and money. More profitable to order ready kit without wasting time winding the circuit. Of course, if you are a fan of creating something unusual with your own hands, then be sure to develop your own wireless charger.

And what about those who do not want to spend time assembling wireless charging with their own hands? It's simple - we order a ready-made kit, which is more or less qualitatively already assembled at the factory. The cost, as a rule, does not exceed 300 rubles, and the kit already includes both the transmitter and the receiver. Wireless chargers are sold in electronics stores, but it is more profitable to order from Chinese online stores.

Note that many modern smartphones are equipped with a receiver (receiver) by the manufacturer. Therefore, the owners of these models do not need to buy anything (in exceptional cases, sellers may not include a docking station (transmitter) in the kit). The list of such devices is quite extensive:

• Samsung (Note 5, S6/S6 Duos and later)
• Google Nexus 4/5/6/7
• LG G3 and new flagships
• Blackberry 8900
• Nokia Lumia (810-930)
• Yotaphone 2

The list includes the most common models, but not all. In addition, it is regularly updated with new devices. To find out if your smartphone supports wireless charging, look for the "Qi" designation in the model's specifications. Information must also be present on the manufacturer's website.

My smartphone does not support wireless charging

If your device has not received a built-in receiver, do not rush to get upset - the Chinese "friends" took care of the users by releasing them as special for certain models, and universal receivers. About the first type, I think everything is clear. Usually, they indicate which smartphone model it is intended for. But the second type of receivers is more interesting. Such receivers are not tied to a specific smartphone, so they can be installed in almost any. However, it should be borne in mind that universal receivers are divided into several classes:

• film with special contacts. Attaches under the cover of the phone without affecting functionality. The device must have contacts near the battery to install it. The main plus is that the charging socket remains free.
• Apple receiver. This type is intended for Apple devices with a Lightning connector, that is, all current models.
• Android receiver. Designed for smartphones with microUSB connector. Since Android smartphones are plentiful, and the manufacturer takes out the charging socket as he wants (and where he wants), you should look at specific model. As a rule, microUSB is located on the bottom or top end, has type “A” (connector in the form of a regular trapezoid, if you look at the smartphone with the screen up), “B” (irregular trapezoid) or “C” (oval).

The docking station (transmitter) does not play a special role - you can even use it from more than one set or a completely different form. Therefore, the receiver and charging pad can be purchased separately, which will help save a little more.

In addition to receivers that need to be mounted on the cover or hidden under it, cases with a built-in receiver are available for sale. Of course, they are not universal, so you can’t pick up for every smartphone. And yes, they don't look the best. Be that as it may, many may still be interested in this view.

Models of wireless ready-made chargers

So, we come to buying a wireless charger on Chinese internet sites. You can, of course, go to an electronics store that sells better models, but you will have to overpay significantly. Therefore, we go to one of the stores on the Internet, where we are looking for something like "universal wireless chargers." Here you will meet a bunch of models. Next, you have several options:

• Purchase complete set. In this case, you get both a receiver (receiver) and a charging pad. Upon receipt, all that remains is to connect everything.
• Buying parts separately. You may already have a receiver and the docking station is broken (or vice versa). In order not to waste money, you can order only what you need.
• Purchase of components for self assembly. Some vendors provide the basics (coils, boards, transistors, etc.) so that the user can build whatever their heart desires.

You can’t single out popular companies, since the sellers don’t even indicate them. And if the manufacturer is indicated, then the name says absolutely nothing (some Chinese firm). Yes, and bother with the search good manufacturer stupid - the cost of wireless charging is usually ridiculous. Plus, customer reviews indicate that the marriage rate is quite low.

It doesn't take much to equip your favorite smartphone with flagship wireless charging.

Firstly, the base, it is also a charger. Most often it is made in the form of a small round platform with an outlet for the charger. For the experiment, let's take an unnamed model with a nice blue backlight. Powered by a 5 V, 2 A power supply ( normal USB), powered by a standard microUSB port. At the output, the device gives 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 at a distance. Usually the distance is minimal, by the way, but the convenience of using it without wires can be significant for someone. For example, the base can be embedded in dashboard car or put on a chest of drawers near the bed: he came, put, went to bed. And no searching for wires.

There are a lot of different universal antennas for smartphones on the market. They are 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 board hidden in a paper-like envelope. A wire with a microUSB plug comes out of it, although you can solder it to any other if you wish. It is worth paying attention: the coil works only in one position in relation to the charger. Since the cable for connecting to a smartphone is flat, it may be necessary to open the bag and turn the coil over for the antenna to work (as in our case). The coil should be directed with the open side towards the charger.

Attention: on the charging base are indicated required parameters power supply (in the case of a used one - 5 V, 2 A). They need to be provided. With less current, charging will be very slow. It may be necessary to replace the cable from the charger kit for adequate operation, since not every USB cable can pass a full 2 ​​A through itself. As you can see,