How to use a wireless charger. Wireless qi charging - what is it? why? how is it used? and how to quickly charge Galaxy S7

A contactless charger is a dream for every smartphone owner. Modern phones need to be charged regularly. Constantly have to connect them with a wire to the adapter. However, now you can choose wireless charging and forget about all the difficulties. Wireless charging for your phone is no longer a dream, but an ordinary device used by millions of users.

For many decades, people have been dreaming about the possibility of transmitting energy over a distance. This is often seen in fantasy novels of the 20th century. And so it happened. Chargers have appeared in use that charge consumers' batteries at a distance. True, the distances are still very small, only a few centimeters, but this is already a confident step forward. And not theoretical, but practical.
At the moment, wireless contactless chargers for smartphones (BZU) are the most widely used. Just put your smartphone on the charger and it will start charging. No wires from wireless charging to a smartphone are needed. Everything works on the law of mutual induction. The phone rang, you calmly take it in your hands without fear of getting tangled in the wires, without fear of damaging the connector contacts, and also not strictly tied to the workplace.
So, at the moment, the wireless charger is no longer a myth. These are adapters that anyone can purchase. You can place the charger on the table by the bed at home or in the car on the dashboard.
But it is worth noting that not all phones and smartphones manufactured by various manufacturers are capable of charging from wireless chargers. Phones supporting wireless charging began to appear quite recently. And which phones support wireless charging, you can find out from the manager of the mobile phone salon. But if your phone does not support this function, then I will describe below how to upgrade your phone or smartphone for these types of charges.

Principle of operation

The principle of operation of a wireless charger is based on the laws discovered by the scientists Tesla and Faraday. These are the so-called phenomena of induction and mutual induction. Remember high school physics. If a current flows through a conductor, then a magnetic field develops around the conductor. If another conductor is introduced into the magnetic field, then an EMF (Electromotive Force) is induced in it.

All transformers work on this principle. If an alternating current is applied to the primary winding of the transformer, then a current is formed in the secondary winding, the value of which will depend on the number of turns in the secondary winding. Wireless charging works on the same principle. And I will try to explain how wireless phone charging works. The source of electromagnetic radiation is the induction coil, which is located in the charger (acts as the primary winding of the transformer). It looks like a stand, a charging glass or something similar. Connects to the mains directly or through an adapter. The device being charged also has its own coil (similar to the secondary winding of a transformer). If both coils are located at a sufficiently close distance from each other, then an alternating current is induced in the second coil, then it is rectified into a constant current and charges the gadget's battery through the charge controller.

Any contactless charging for a phone or other device works according to this principle, whether in a house or a car. Most often we meet devices of the QI standard.

Wireless charger standards

qi
The most common wireless charging standard is Qi. This standard was developed by the Wireless Power Consortium (WPC for short) and is supported by many manufacturers such as Samsung, Nokia, LG and others. The Qi standard is read as Qi, which in Chinese is consonant in translation with the word "life".

The principle of operation is based on the law of mutual induction, as described above. The operating frequency of the BZU is 100-205 kHz. Efficiency 75-80%.
PMA
Another popular standard is called PMA. Its principle is also based on the law of electromagnetic induction. This standard was developed by Powermat in 2012. It is not as popular as Qi, but it also has its advantages.

The main efforts of the company directed to the development of a better transmitter of the electromagnetic field. Yes, and the frequency of the charger is 277-357 kHz.
This standard is mainly distributed in the USA. But still, the PMA standard loses quite a lot to Qi.
Residence (A4WP)
The principle of operation of the Rezence standard is based on the law of magnetic resonance. This allows you to increase the transmitted power up to 50 W, which is enough to charge more powerful devices, and even several devices at the same time. And you can also increase the distance from charging to a rechargeable gadget.

But so far this standard is more theoretical and does not receive wide support.

Where are wireless chargers used?

Since the invention of wireless charging, it immediately began to be introduced by various manufacturers to charge the batteries of various devices.
Toothbrush manufacturers were among the first to introduce wireless charging. The fact is that toothbrushes have direct contact with water. This is where the invention of the BZU came in handy. After all, these devices do not have bare contacts. The toothbrush and charger are well sealed.

Apple Corporation is also keeping up with the progress. They have introduced wireless charging for their Apple Watches.

But the most popular wireless chargers for smartphones. What a convenience. Just put your smartphone on the charger and the charging process starts. No wires. A large share of smartphones with such chargers was released by Samsung. Nokia also released smartphones with such chargers. In 2017, Apple released the iPhone 8 iPhone X smartphone, which can also be charged from the BZU.
Often such devices are installed in public places. In cafes and restaurants, people are used to working with smartphones, chatting or having fun. The Internet takes a lot of battery power.

In order to attract visitors and make guests stay as long as possible in these establishments, the owners offer free Wi-Fi, but, of course, contactless chargers for smartphones that are built right into the tables of the establishment.

Also, many manufacturers produce wireless car chargers for your phone. The principle of wireless charging is very simple. the wire from this charge is inserted into the cigarette lighter socket, the charge itself is installed in a convenient place, taking into account that the phone will not fall from it while driving.

Advantages of wireless chargers

There are many advantages to having your phone charged in a contactless way. First of all, the main problem is solved, namely adapters. Now there will be one universal panel for all devices at once. The wires will not wear out and the jacks on the mobile phone will not break too quickly. For a charging iPhone, this is also especially important, because its repair is expensive.
When choosing a specific adapter, one cannot help but think about the advantages of contactless:

• Convenience. You can use it anywhere.
• You can charge multiple phones at once.
• Over time, devices that support this function become more and more.
• Electricity is spent at a minimum, although the efficiency of this charge is about 80%.
• Samsung and some other companies are planning to offer a similar adapter immediately with the phone.
• Durability. The charger can last for many years.

Manufacturers

Many companies have taken up the issue of creating and developing contactless chargers for phones. Each of them is focused on certain features and is ready to satisfy the specific wishes of users. First of all, you need to consider chargers from smartphone manufacturers that have wireless charging enabled.

How to improve your smartphone with your own hands

As I wrote above, not all smartphones can work with contactless chargers. There is no receiving part inside these smartphones. But this is not a sentence. Today, in addition to wireless chargers, there are also separate receiving devices on sale on the market.

They look like a sheet of cardboard the size of a matchbox. A receiving coil is placed inside this plate. The receiver is of two types. The first option - the receiving part is placed under the battery cover of the smartphone and is connected directly to the battery.

The second option - the receiving part is connected to the input connector and covered with a smartphone case.

Yes, there is another option. Smartphone cases are available with a built-in receiving part.

How to choose

Experts advise before deciding which contactless charging for your phone to choose, to decide whether the gadget supports this technology. Apple is specifically categorically against this practice, because they are focused on using original contactless adapters. However, Samsung and many other manufacturers do not need such a careful selection. Many gadgets allow a modern phone charger from different manufacturers.

Overview of wireless chargers video must-see

Wireless charging appeared a few years ago. Modern manufacturers of 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

To charge smartphones Samsung, iPhone, Sony and other brands often use specialized 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. The absence of a wire reduces the risk of electrical shorts.

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

It is assumed that charging stations without electric wires will soon appear at 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 unites global electronic product manufacturing companies. The consortium set itself the task of standardizing the process of replenishing the battery capacity of smartphones by induction.

The induction coil used in modern devices without electrical wires is 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 within the range of the magnetic field. One of them is connected to the power supply. Voltage is applied to the second coil. An important condition is that 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. The component conducts electrical current 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. The action is similar to a Wi-Fi or mobile signal.

Products with a power of 120 watts are capable of influencing the human body. Use them to replenish the battery capacity of laptops. They are not produced commercially. 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 lasers are powerful variants of inductive charge that can be transmitted over considerable distances. Their disadvantage is powerful radiation, which can harm a person.

Apple has 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 can fit into laptops and be able to provide power to a variety of peripherals.

Under the Samsung brand, a docking station has already been released for recharging the battery. 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 cases or special stickers on them.

Universal wireless chargers use for phones:

• Samsung Galaxy S3, S6, S7, S8 different modifications;
• Luma;
• Lenovo;
• iPhone.

The time to fully charge the battery 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.

It is better not to save on buying an original charger without cables. The latest smartphone models are equipped with a docking station and a receiver. Failure of this device incurs 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 just another unnecessary feature of a modern smartphone. The responsible approach of the manufacturer makes it popular among users of phones of various brands and models. Gadget charging points appear 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 impossibility of forgetting to put an electronic device on charge.
• 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 a special cable. In this case, the charging itself is connected with a wire to an 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. Despite this, this technology is attractive to users. Car charging 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.

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 (regular USB), powered through 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.

The second necessary element of modernization is 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 built into the dashboard of a car or put on a chest of drawers near the bed: you 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 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: the required parameters of the power supply are indicated on the charging base (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,

The transmission of energy wirelessly until recently seemed like a crazy dream of a science fiction writer, but today it is quite feasible. Wireless chargers, which are rapidly replacing traditional wired chargers in the Western market, will probably soon win the windows and hearts of consumers in Russia as well. It is still difficult to find wireless chargers in domestic communication stores, however, gadget users are actively interested in how these unique devices work and whether they cause harm to human health. We will try to answer the most common questions in this article.

To understand the principle of wireless charging, you have to remember the school physics course and, in particular, the meaning of the term " electromagnetic induction". Induction is the formation of a current that occurs due to a change in the magnetic flux in a closed circuit.

The wireless charger contains a transmitting electromagnetic coil ( Transmit Coil) is the one that generates the magnetic field. Inside the gadget there must be a receiving coil ( Receive Coil) - that is why not every smartphone can be recharged wirelessly. The greater the distance at which the two coils are from each other, the weaker the energy flow. It is also important to keep in mind that the two coils must not touch each other.

The wireless power standard is called qi.

Wireless charging has been around for a long time for toothbrushes and electric shavers. Alas, all this time, the technology was accompanied by customer complaints that charging was too slow and unstable.

To recharge a smartphone, simply put it on a special stand - after that, the transmitting coil is activated and begins to "share" the current. You can charge in this way anywhere - at home, in a car, in a public place. In some countries, wireless charging pads are placed in cafes so that the visitor can spend time while waiting for the order.

How efficient is wireless charging?

Wireless charger is still less efficient than wired charging This statement is not going to be challenged by anyone. Confirming it is quite easy - with the help of simple calculations.

Charging efficiency mainly depends on 2 indicators: current strength(measured in amps) and voltage(measured in volts). Traditional charging delivers an average of 1 Amp of current at a voltage of 5 V - as a result, a battery with a capacity of 3000 mA is charged from zero “to the brim” in about 3 and a half hours. Wireless charging at the same voltage delivers only 0.65 amps (again on average) - this means that it will take at least 4 hours.

All calculations given are, of course, approximate. The efficiency of wireless charging also depends on other factors, such as:

• Coil sizes.
• Coil spacing. For stable charging, the distance between the gadget and the stand should not exceed 5 cm.
• winding resistance.
• The presence of the so-called skin effect- the effect in which the current flows only through a thin surface layer of the conductor.

Advantages and disadvantages of wireless charging

Despite the fact that the efficiency of wireless chargers leaves much to be desired, these devices have a lot of advantages:

• No wires. The most obvious plus: you no longer have to insert the cable into the gadget. In fact, this advantage is “far-fetched”, because the user cannot do without wires at all - after all, you need to somehow feed the station itself.
• Versatility. With a single wireless charger, you can charge any mobile device that supports this function.
• Low prices. In domestic electronics stores you cannot find a wireless charger cheaper than 1 thousand rubles, but, for example, on AliExpress such a device can be bought for only 200-250 rubles.

The main disadvantages of wireless chargers have already been mentioned - this is low efficiency and the need to keep the coils in close proximity to each other. Other less significant cons include:

• In the process of wireless charging, the mobile device gets very hot - the result of this is sometimes the battery failure.
• A "mobile phone" that is being charged receives radio signals with significant distortion.
• Some of the models of gadgets (for example, iPhone) can only be recharged wirelessly using a special case or adapter for wireless charging. The acquisition of such equipment, of course, promises additional costs.

Is it safe to use wireless charging?

Some users of mobile devices refuse wireless charging, because they are worried that magnetic radiation will not be harmful. Health concerns are nothing more than paranoia: this is stated not only by experts, but also by members of the Wireless Electromagnetic Energy Consortium ( WPC) - the organization that developed the technology qi.

The power of the wireless charger is only 5 watts - this is definitely not enough to have an impact on the human body. Negative consequences can only be when using a memory with a power of 120 watts - such devices are also produced, but not on an industrial scale, and they are designed to recharge laptops.

In terms of impact on the body, the electromagnetic signal of a wireless charger is similar to a cellular signal - with the only difference being that it is weaker and stops when the smartphone is charging.

Users are worried not only about health, but also about the safety of personal data. In mid-2016, a new method of hacker attack became known. Thanks to fake USB wires, hackers can steal data (passwords and pin codes) from victims' phones while they recharge their gadgets from computer ports, according to a security agency. Aries Security. Because of this news, users have become even more wary of chargers placed in public places - including to wireless.

It is impossible to steal data through wireless charging.

Theft of information through a USB cable became possible because the wire has 2 functions - it provides recharging of a mobile device and data exchange between gadgets (smartphone and PC). Wireless charging is not capable of performing a second function. It will be possible to start worrying when developers endow wireless storage stations with the functions of a data exchange point, but this is not expected in the near future.

Best Wireless Phone Chargers

A user who is interested in the prospect of wireless charging of a gadget should pay attention to the following memory models.

Samsung PG920

Despite the fact that the wireless charger market is still young, the charger from Samsung has already become its classic. Key Benefits PG920- compact size, attractive appearance and fairly low price (about 1000 rubles).

Please note that charging from Samsung is universal, and therefore can recharge gadgets not only of the Korean "giant", but also of other manufacturers.

Tylt Vu

The main feature of charging TyltVu- unique shape. Charging is a broken plane, consisting of 3 surfaces. Thanks to this form of memory, the gadget is convenient to use while it is storing energy.

Tylt Vu, undoubtedly, will please fans of bright colors - memory devices are available to customers in 4 color options: black, yellow, red and blue. However, for the original shape and the ability to choose colors, you will have to pay a significant amount - about $ 30.

Anker Wireless Charging Pad

Charging from Anker It has very modest dimensions, but this is not its only advantage. In addition, it has a temperature sensor. temperature control, which will ensure that the device does not overheat during the charging process. After the gadget battery is 100% full, Anker Wireless Charging Pad will automatically turn off and will not consume excess energy.

Another benefit of charging Anker – price. Memory is among the most affordable; It's on sale for just $10.

Woodpuck Fast Edition

Users may be put off by the $40 price tag, but there is something to pay for. Woodpuck is not only the most stylish and original wireless charger, but also the most efficient.

Woodpuck made from real bamboo, and therefore is considered the most "environmentally friendly" memory. The device works with all gadgets equipped with the function qi, and charges them much faster than analogues - studies have shown that the user can save up to 40% of the time.

Nokia DT-903

DT-903- Another charger with an incomparable design. While recharging the gadget, the platform burns brightly enough, so that the user can do without a night light. If the glow interferes, it is easy to turn it off by pressing the button located on the bottom plate.

Efficiency DT-903 is at a fairly high level: according to engineers Nokia Wireless charger charges your smartphone in the same time as wired charging. The device from the Finnish company is compatible not only with devices Lumia, but also with gadgets from other manufacturers. The cost of this curious device is about 2500 rubles.

Conclusion

Wireless chargers captivate not only with a combination of efficiency and effectiveness, but also with simplicity. Everything ingenious is simple: it is enough to use two inductors to stop being a slave to wires - even Faraday could have reached the creation of a wireless memory a century and a half ago, if he knew what era his descendants would have to live in.

The primitiveness of the design can push the owner of the gadget to independent experiments with electromagnetic radiation and conductors - on the Internet, alas, there are a lot of articles advising how to assemble a wireless charger with your own hands, authored by indoor inventors. We recommend that you start such attempts only if you have a physics diploma in your desk drawer. An amateur in the course of such experiments can easily disable the gadget.

How does wireless smartphone charging work? August 21st, 2016

Now more and more often I hear about wireless charging. Four months ago, when I was looking for a new car, I saw a Kia "Sportage" with such a built-in charger. I also thought, who is it designed for, for units? It seemed that for this you need to have some kind of cool phone model or some kind of expensive equipment. But it turns out that my mid-range phone also supports this technology. I thought, I do not know the principles of how it works. It seemed to me that this technology is still quite "far" from the layman, but it is already nearby and quite accessible.

Let's take a closer look...

It turns out that the principle of operation of a wireless charger 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.

Cordless toothbrushes have been using wireless charging for a long time. The technology has traditionally been accompanied by problems of low efficiency and slow charging, but these were not a critical drawback for a toothbrush or electric razor that you only use for a few minutes every day. Using inductive charging is safer in that there is no wire and it won't short out and you won't accidentally touch badly insulated areas with wet hands.

This method of energy transfer has become very popular in recent times. 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 at airports, restaurants, cinemas, fast food, shopping centers, which will allow charging 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 wired chargers everywhere with us for all the devices we use.

The wireless power standard is called Qi. In Russian transcription, the word is pronounced as "Qi". The standard bears such a name in honor of the term of Eastern philosophy and means the flow of energy. It is developed by the WPC Wireless Electromagnetic Energy Consortium. This organization brings together 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 can be charged without being connected to the network. It's incredibly convenient. Each of us at least once faced with a situation where the smartphone is discharged. 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, 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 the 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 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 come into 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 battery capacity of tablet computers and phones. It should be noted that different current strengths are required for a tablet and a smartphone. A wireless charger for a phone creates a current of 1 amp, and for a tablet computer - 2 amps. When choosing an accessory, be sure to pay attention to such characteristics.

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 at the moment when the gadget with the built-in transmitter is close to the transmitter. If the accessory for charging the gadget will function 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's battery is charged, the corresponding signal will put the charger into the background. It can be concluded that modern wireless accessories for battery replenishment are energy efficient.

More charts and formulas

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 signal, a Wi-Fi signal, a radio signal. At the same time, the signal of the mobile network that 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. 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.

prospects

This inductive charging may be convenient, but the short range is a problem. This drastically reduces the usability of this technology. Will this change? May be. There has been a lot of research into the potential of wireless charging and there have been advances in range in various technologies. Lasers, microwave ovens, and more powerful variants of inductive charging have been able to achieve longer transmission distances. Disadvantages prevent widespread this too powerful radiation of the above technologies. You can get burned or worse. It is difficult to say who will take the lead in this market. The first candidate is Apple, because the company has patented a device that can allegedly charge at a distance of up to one meter. The Wireless Power Consortium is also constantly looking for better options. And then there's Intel, which recently announced that it's working on an integrated magnetic device technology that will be placed in a laptop and distribute power to nearby smartphones and peripherals.

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