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Wireless phone charger: utopia or reality?

At that time in Europe platforms for wireless charging of smartphones equipped with cafes and restaurants, the USssians this technology continues to seem something "out of the ordinary". To fill the gaps in knowledge of domestic users, will talk about the pros and cons of wireless memory.

The transfer of energy wirelessly until recently it seemed a mad dream of science fiction, but today is quite feasible. Wireless memory is rapidly displacing traditional wired charging in the Western market, probably, will soon showcase and win the hearts of consumers in USssia. Find wireless charging in the domestic mobile phone is difficult, but users of gadgets are actively interested in how these unique devices and whether they do not cause harm to human health. The most common questions we try to answer in this article.

Как работает беспроводное the charger для мобильных телефонов?

To understand the working principle of wireless charging, will have to remember the school course of physics and, in particular, the meaning of the term " electromagnetic induction". Induction is the formation of a current occurring due to changes in magnetic flux in closed loop.

Wireless the charger contains the transmission of an electromagnetic coil (Transmit Coil) that generates a magnetic field. Inside the gadget must be the take-up spool (Receive Coil) – that is why not every smartphone can be recharged wirelessly. The greater the distance at which are located two coils from each other, the weaker the flow of energy. It is important to keep in mind that two coils must not touch each other.

Standard wireless power received the name Qi.

The way wireless charging has long been relevant for toothbrushes and electric razors. Alas, all this technology was accompanied by customer complaints that the charging is very slow and unstable.

To charge the smartphone by simply placing it on a special stand – after that, the transmitting coil is activated and will begin to share current. To charge thus it is possible anywhere – at home, in the car, in a public place. In some countries stand for wireless charging located in the cafe, that a visitor would not spend time waiting for the order.

How efficient charging wireless standard?

Wireless the charger пока менее эффективно, чем проводная зарядка is the assertion that no challenge is going. Confirm it easily enough – with the help of simple calculations.

The charge efficiency depends mainly on 2 parameters: current (measured in amperes) and voltage (measured in volts). Traditional charging on average delivers 1 amp of current at 5 volts – the battery capacity of 3000 mA charging from scratch "to the brim" around 3 hours and a half. Wireless charging at the same voltage delivers 0.65 Amps (again, on average) – this means that the content of the battery energy is gone minimum 4 hours.

All the calculations, of course, approximate. The efficiency of wireless charging depends on other factors – for example, from:

  • the Dimensions of the coils.
  • the distance between the coils. That charge stemmed steadily, the distance between the gadget and the stand must not exceed 5 cm
  • of the Resistance of the windings.
  • existence of a so-called skin effect effect, in which current flows only in thin surface layer of the conductor.

The advantages and disadvantages of wireless charging

Despite the fact that the efficiency of wireless chargers is poor, these devices have many advantages:

  • No wires. The most obvious advantage: to insert the cable into the gadget will not have. This is actually the advantage of "far-fetched", after all without wires the user do not succeed, you will need to feed the station itself.
  • Versatility. Using one of the wireless memory can be charged any mobile device that supports this function.
  • Low prices. In the domestic electronics stores to find a wireless memory cheaper 1 thousand rubles, but, for example, in AliExpress this device will be bought for 200-250 rubles.

On the main shortcomings of wireless memory already mentioned is the low efficiency and the need to keep the coil in close proximity to each other. Among other, less significant disadvantages include the following:

  • In the process of wirelessly charging the mobile device gets very warm – the result sometimes becomes damage of the battery.
  • , "mobile Phone", located on the charging, receives wireless signals with significant distortion.
  • Some of the models of gadgets (e.g., IPhone) to charge wirelessly only through a special case or adapter for wireless charging. The acquisition of such equipment, of course, promises for more spending.

is it Safe to use wireless charging?

The part of the users of mobile devices refuses wireless charges, because is going through, how would magnetic radiation was not harmful. Concerns about health – not more than paranoia: say this not only experts, but also members of the wireless power Consortium (WPC) – the organization that developed the technology Qi.

The power of the wireless memory is only 5 Watts – that's enough to have an impact on the human body. Negative consequences can be only if you use memory with a capacity of 120 Watts – this device is also released, but not on an industrial scale, and they are intended to recharge laptops.

Electromagnetic signal of the wireless memory with the points view effects on the body similar to a cell phone signal – with the only difference that is more mild and stops with the charging of the smartphone.

'm worried not only for health but also for the safety of personal data. In the middle of 2016 became aware of a new method of a hacker attack. Thanks fake USB wires hackers can steal data (passwords and pins) from the victims ' phones while they recharge gadgets from the ports of computers, as reported by security Agency Aries Security. Because of this news, users become more wary of charging devices placed in public places – including for wireless.

Stealing data via wireless charging impossible.

The theft of information via USB cable possible, because the wire has 2 functions – it provides the recharging of the mobile device and exchange data between gadgets (smartphone and PC). Wireless charging second function is not able to perform. You can start to worry when the developers will give the station the wireless memory functions of data exchange, but in the near future is not expected.

The best wireless chargers for phones

the User is interested in the prospect of wireless charging gadget, you should pay attention to the following models of memory.

Samsung PG920

Despite the fact that the market for wireless charging is still young, the memory of the Samsung it has already become a classic. Key benefits PG920 – compact size, attractive appearance and relatively low price (about $ 1000).

Note that the charging of the Samsung is universal, and therefore can charge your gadgets is not only the Korean giant, but other manufacturers.

Tylt Vu

the Main feature of the charging Tylt Vuunique form. Charging is a broken plane, consisting of 3-surfaces. This form of memory is a convenient gadget to use it while he gathers energy.

Tylt Vu, sure to delight lovers of bright shades – buyers memory is available in 4 color versions: black, yellow, red and blue. However, the original shape and color choices you will have to pay a substantial amount – about $ 30.

Anker's Wireless Charging Pad

Charging Anker's has a very modest dimensions, but this is not its only advantage. In addition, it has a temperature sensor Temperature Control to ensure that the device does not overheat during the charging process. After the battery of the gadget will be filled at 100%, Anker's Wireless Charging Pad will turn off automatically and will not expend unnecessary energy.

Another advantage of charging from a Anker'sprice. Memory is among the most available; it is sold for only $ 10.

Woodpuck FAST Edition

Users may scare off price of $ 40, however the pay is for that. Woodpuck – не только самое стильное и оригинальное беспроводное the charger, но ещё и самое эффективное.

Woodpuck is made from real bamboo, and therefore is considered the most "clean" memory. The device works with all gadgets feature Qi, and charges them much faster than counterparts – the study revealed that user will be able to save up to 40% of the time.

Nokia DT-903

DT-903 – ещё одно the charger с бесподобным дизайном. Во время подзарядки гаджета платформа достаточно ярко горит, благодаря чему пользователь может обходиться без ночника. Если свечение мешает, его легко отключить, нажав на кнопку, расположенную на нижней пластине.

the Efficiency DT-903 is quite high: on assurances of engineers Nokia memory wirelessly charges the smartphone at the same time as wired charging. Device from the Finnish company is not only compatible with devices Lumia, but also with gadgets of other manufacturers. The cost of this curious device is about 2500 rubles.


Wireless chargers impresses by the combination of efficiency and effectiveness, but also simplicity. All ingenious is simple: it is enough to use two inductors to stop being a slave to the wires – to create the wireless memory could walk and Faraday another century and a half ago, if I knew in what era will have to live his descendants.

The primitive design is able to push the owner of the gadget independent experiments with electromagnetic radiation and guides — the Internet is, alas, plenty of articles, advice, how to build wireless charging with their hands, authored by the inventors room. We suggest you to proceed to such attempts, only if you have a drawer holds the diploma of the faculty. The layman in the course of such experiments could easily bring the gadget to malfunction.