Currently, technical progress is developing very rapidly. Therefore, many people do not have time to not only acquire what, but even follow the implementation of seemingly fantastic ideas. Most recently, one of them was the ability to charge mobile devices without any wires. But still most of the users of gadgets can not understand the principle of operation of the wireless charger, they consider such modern inventions fiction.
However, the user of a mobile phone or tablet, who is tired of each time he charges the gadget to unravel the wires, needs to become more familiar with the principles of operation of an alternative type of power transmission.
The principle of wireless charging for gadgets
Virtually every second smartphone owner believes that wireless charging is capable of transmitting electricity to any distance. But this is a misconception.
To understand the principle of operation of such a device for mobile phones, it is necessary to study the available information in more detail. It can be concluded that charging without wires is based on a magnetic induction method of transferring electricity from one device to another.
In addition, modern scientists and researchers argue that electricity can be transmitted using a laser, sound waves, other physical phenomena. But so far, in fact, such innovative technologies have not gone further than active development.
The only thing that modern scientists can boast of is that the already mentioned electromagnetic induction is used not only in wireless charging for mobile phones, but also for other commercial and technological purposes.
It is also worth knowing that any high-tech sphere has its strictly established standards (Qi), which are necessarily taken into account when developing a new or improving an outdated device. That is, these standards are aimed at preserving the functionality of modern devices.
Many mobile phone manufacturers use these (Qi) standards for the production of gadgets designed to charge the battery without the use of electrical wires.
In this regard, the owner of such a mobile device, located at the airport, train station or other populous place of an economically developed country, will be able to charge his mobile phone without wires and sockets.
As in such places special charging bases are installed and successfully functioning, which allow everyone to make wireless charging of their gadgets.
The principle of wireless charging for smartphones is based on providing electrical contact between the radiating and receiving units, which, in turn, are equipped with special induction coils. In this case, it should be borne in mind that an old-fashioned mobile phone cannot be recharged from a wireless charging station, since it is not equipped with an induction coil.
Remote charging devices as follows:
- A charging station connected to the mains using induction coils begins to create a magnetic field.
- When a gadget that supports (Qi) standards falls into such a magnetic field, it begins to dynamically consume the electromagnetic waves produced by charging.
- Next, the built-in induction coil converts consumed electrowaves into electrical energy, which provides battery charging.
Wireless charging users need to know how to use this device. The main thing is to maintain the desired distance, which should not exceed five centimeters from the station to the mobile phone. Many people believe that if you put the phone in close proximity to the charging station, its battery will charge faster and more efficiently.
However, this opinion is erroneous, since the efficiency of such a wireless device at best will be no more than eighty percent. Therefore, users who want to get the maximum useful results from the actions performed are recommended to use wired charging, which has a much higher coefficient.
In addition, conventional stationary charging charges the battery much faster than an alternative device based on induction coils. According to the experiments, it was found that it would take sixty minutes more time to fully charge the same battery in a wireless station than a conventional wired battery charger.
Advantages and disadvantages
The use of modern chargers without wires has the following advantages:
- there is no need to untangle the wires;
- You can charge gadgets in almost any convenient place, regardless of the length of the cord;
- does not adversely affect the human body;
- from one device you can charge multiple phones.
As for the shortcomings, they are as follows:
- It is impossible to completely avoid a wireless connection, since charging must be connected to an electrical network with a voltage of 220 volts, and this requires the use of plugs, sockets, wires;
- long enough period of charging the mobile device;
- high cost, which is two or more times higher than the cost of a conventional charger.
The effectiveness of the device
As already mentioned, currently the wireless standard has less efficiency than traditional charging. First, it depends on the strength of the current and voltage. For comparison: a wired device at the output has a current of 1 ampere, and a wireless device does not exceed 0.7 amperes.
Therefore, charging the battery from a modern station will occur much slower than from the usual wired standard.
In addition, the performance of such cordless stations depends on the following parameters:
- Induction coil size.
- Intermediate distance between induction elements.
- Winding resistance.
- The presence of a "skin effect", when the electric current has the ability to flow exclusively through the superficial, thinnest layer of the conductor.
List of the most popular devices
Professionals who follow the release of modern technological innovations recommend recommending charging based on (Qi) standards.
Samsung PG920
It is a versatile device with a compact size. The price is about one thousand rubles.
Tylt vu
The main feature of such a device is its unique shape, which is represented by a broken plane consisting of three surfaces. Also, this manufacturer is a device in four different colors. The price of such a charge is about two thousand rubles.
Anker wireless charging pad
The device with the minimum dimensions, has the built-in temperature sensor. It is he who monitors the overheating of the device. Also, charging is automatically turned off when the battery level is filled to one hundred percent. The price is only six hundred rubles.
Woodpuck FAST Edition
It is considered the most effective and powerful charging among wireless standards. It has an original look. In addition, it is made from environmentally friendly natural bamboo and is suitable for all gadgets that have the "Qi" function. You can purchase such a device for two and a half thousand rubles.
Nokia DT-903
Another effective universal charge with a beautiful design. Charging time is no different from a conventional wired device. The price varies from two to two and a half thousand rubles.
On the Internet you can find a lot of both positive and negative reviews about the wireless device for gadgets. The number of positive comments significantly exceeds the negative ones, which are mainly expressed in an overpriced price.
How to make a wireless charging for your phone
Do not want to buy such equipment due to lack of funds? It does not matter, since there is an opportunity to make a wireless charging with your own hands. The whole process consists of two stages: the creation of the transmitter and the receiver (internal and external part).
The first one is separate, the second one needs to be installed in the smartphone. The convenience of such a charge is that it can be easily put in a backpack.
The transmitter is manufactured as follows:
- Prepare the frame with a diameter of about 10 cm.
- We wind about 40 turns of copper wire with a diameter of 0.5 mm on it. After 20 laps you need to make a withdrawal (twist the wire and continue to work).
- We connect the transistor (the value can be any) to the tap and to the coil. Do not forget that if you use a direct conduction device, change the polarity during installation.
- Install the design in a plastic container.
Now it's time to make the receiver device, which has a flat appearance and consists of 25 turns (the wire diameter must be smaller). The instruction is as follows:
- Separate the contour from the plastic base using a sharp knife.
- Connect the diode and fasten the top of the battery.
- Use a capacitor to stabilize the voltage.
- We connect with the connector from charging.
- Close the roof of the smartphone.
To use self-made charging, simply put the phone on the transmitter.
