Universal wireless charging kit QI Wireless Charger. Smartphones with wireless charging

If this is your first time hearing about wireless charging technology, we strongly recommend that you read the material here.

From the world by thread

So, at MWC 2013 (Mobile World Congress, for that matter), the presentation of wireless charging looked somewhat generalized compared to the previous year. And it seems that we have all already seen this.

Let’s remember that in 2012, Duracell dedicated a separate stand to wireless charging, showing entire sets of devices for no more than $130 (price in the USA). Among the new products, the company also introduced the Wireless Charging Card - a special insert that could be placed under the cover of almost every mobile device without harming the strength of the case. With a thickness of less than 1 mm, the liner does not lead to the formation of backlashes or loose contact of the cover with the body of the smartphone. The Wireless Charging Card today has many analogues, and this development was not the first of its kind.

In addition to Duracell, the wireless charging stand was also prepared by the Wireless Power Consortium Association, which, by the way, came up with the idea of ​​​​standardizing wireless charging technology (later called Qi, read as “qi”). The WPC includes dozens of the largest companies from around the world. Offhand, among others there are Energizer, Samsung, LG, Philips, Nokia, Sony and, more recently, the same Duracell. In addition to Qi, the Association earned another big plus in its karma by making all its certified products compatible. Those. The Qi charger from Nokia can charge not only its own smartphones of this brand, but also any other gadget that meets the generally accepted standard. And if suddenly you carry a smartphone with a Duracell insert in your pocket, you can also charge your mobile phone on any of the Qi-supporting bases.

This year there was only one stand. Developments have not gone far technologically, but a couple of innovations have nevertheless appeared: firstly, in 2012, it was possible to charge mobile communication devices using Qi and only because... the maximum power of 5 watts was enough for this. The 35-watt charging prototype, also presented at the World Congress, did not look very confident, so consultants immediately hinted that the device was still at the development stage. At the current MWC, devices with a power of up to 120 watts have already been presented, which is enough to charge tablets.

The inductive charging principle has not yet allowed manufacturers to change the shape of the dispensing and receiving parts of the device. Wireless charging is essentially two coils - distributing and receiving - between which a magnetic field arises. Often we don’t see the simple internal structure of the charger, but some manufacturers have managed to beat it. Thus, the ring-shaped PowerKiss adapters caused particular joy, thanks to which you can even charge phones without a built-in Qi module.

PowerKiss, due to the release of several modifications of the USB connector, can be connected to absolutely any phone or smartphone, lay the gadget flat on the station and enjoy wireless charging. They are produced in different colors, which can also add to the useful characteristics of the device.

At MWC 2013, PowerKiss was shown again, and with it some very smart solutions for adapting the transmitter. They propose to make it not in the form of a separate object, but, for example, to discreetly adapt it to a specific interior: instead of the usual mat or stand, the base can be located in the arm of your sofa, or in the lid of a multimedia center or speakers.

The latter option has already been embodied in TDK products: the Wireless Charging Speaker Q35 looks stylish, and, in addition to its intended purpose, it also charges your cell phones.

Price issue

Unfortunately, we did not get our hands on any of the listed devices, so we will limit ourselves only to general specifications and, in fact, price tags.

Devices that support wireless charging technology can be divided into two categories. Those in which this feature is included by the manufacturer are called “Qi Integrated”. Phones that support Qi out of the box will be slightly larger than others. But you don’t have to glue inserts under the cover or connect any other spare parts built into the case. You will need to buy a distribution base and that’s basically all.

The “Qi Ready” category includes devices that are Qi-ready, but require a technological upgrade to ensure full operation of the technology. In this case, both the transmitter and the receiver will appear on the shopping list.

True, you most likely will not see either the first or second designation on the device box. Manufacturers often simply limit themselves to mentioning the ability to connect a smartphone or tablet to Qi. You can only find out which phone you got by opening the package. Or, say, from detailed reviews of this model.

See the table of phones that support Qi below. Compatible models released as of early 2013 are shown here.

On sale, as you might have guessed, you can find both a Qi-charging kit and a base and receiver separately. For example, the Philips DLP7210B kit is a case for the rear panel of the device with an energy-receiving coil, as well as a base for transmitting charge. The Qi charging kit for the Samsung Galaxy S4 is made using a similar principle.

Production subtleties

With Qi, the charger market has expanded significantly. Judge for yourself: if earlier we were somehow not very picky about the design of adapters, now we have the right to turn our noses a little. The consumer chooses the device based on its shape, color, and how it is attached to the phone. At the same time, not limiting ourselves to the offers of only one brand that has released a consumer-owned gadget.

Perhaps the simplest option is to place a receiver chip under the device’s body if your smartphone or tablet did not initially receive one. Firstly, this will not affect the external condition of the phone: it will still be hidden under the cover! And secondly, it will not significantly affect the weight of the gadget.

The cost of the receiver plate is low: for example, a plate that is universal for all Samsung smartphones can be purchased starting from $11. The complete set (base and receiver) will cost about $62.

Another “inconspicuous” option for connecting your phone to Qi is a replaceable back cover with a built-in receiver. Such, as we have already said, are also in the catalogs of Nokia, Philips and Samsung.

The advantage of the back cover with a Qi receiver is that, although it somewhat thickens the body of the device, it also serves to protect the gadget. Such gadgets do not have armor-piercing properties, but, in theory, the phone will be more intact.

A branded cover for Nokia Lumia phones will cost about $27. Note that the manufacturer produces them in several colors.

Another form of receiver is one that connects via the PowerKiss USB port. This one costs about $34/piece. (USA). This project is interesting in that it is aimed, rather, not at individual use, but at mass use: furniture with built-in Qi bases, as well as PowerKiss rings scattered on the surface, may soon appear in airports, waiting rooms at train stations, cafes, libraries and other public places where such an innovation will deservedly receive national gratitude.

PowerKiss, by the way, solves the problem of connecting smartphones to Qi bases that, although they have a non-removable back cover, did not receive the corresponding wireless charging module during production. Removable panels with a Qi module can still be attached to such smartphones. But when purchasing a kit, you need to carefully read the device specifications: not all receivers are capable of efficiently transmitting energy through the lid. And PowerKiss provides direct communication with the device’s battery, so you’ll have a better chance of charging the battery faster with just such a “ring.”

Speaking of efficiency. The efficiency of most wireless chargers is no more than 80%. This does not mean that your phone will lack something, it’s just that the technology is still imperfect and you need to carefully follow the instructions in the operating instructions to improve the level of Qi performance in each specific case.

Rarely, but sometimes particularly honest manufacturers admit that their device will not be able to work to its maximum, no matter how hard you try. For example, the description of METRANS Wireless Transmitting Terminal MWT02 clearly states: the maximum operating efficiency is 73%. At a price of almost $78, this is a quite frank warning.

If Qi, as seen in the example of PowerKiss, is just being planned to be integrated into the interior, particularly enterprising owners of wireless chargers manage to independently place charging bases under the covers of bedside tables or coffee tables. The following video clearly shows how easily the latest technologies lend themselves to such creative experiments.

Now a little about the forms of distribution bases.

The most common option: a pad-shaped base, i.e. stands.

Let us remind you that in order to wirelessly charge the gadget, it must be closely adjacent to the base. The maximum distance by which the device can be raised today for continuous energy transfer is only 4 cm!

Below you can watch a test of the Qi system from Nokia a la “charging with obstacles”.

The horizontal position of the smartphone, on the one hand, is as convenient as possible for a typical scenario: you come and throw the phone on the table. On the other hand, it is much more convenient to use a smartphone while charging if the same platform has a certain lifting angle: not enough for the smartphone to slide off, but making it easier to work with the device if it is suddenly needed.

Strictly horizontal bases can be found in the catalogs:

• Zens (charger for one smartphone costs $65);
• Energizer (the Dual Inductive Charger base allows you to charge up to three devices: two via Qi, and the third via a standard USB port; the model’s body is slightly inclined, which is much better for the office charging option than the flat version; it costs $89);
• Duracell (the silver Powermat pad costs $34 and is designed to charge one smartphone; it has a nice square shape with rounded edges);
• Nokia (DT-900 base is no larger in size than a computer mouse; suitable not only for Nokia phones; price $47).

Another “flat”, but non-standard option is presented by TDK: the Q35 Qi Wireless Charging Speaker costs $199 and is a speaker placed in a modern cubic case, on the top edge of which, in fact, the distribution coil is mounted.

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

Nowadays I hear more and more about wireless charging. Four months ago, when I was looking for a new car, I saw a Kia Sportage with a built-in charger. I also thought, who is this intended for, just a few? It seemed that for this you need to have some kind of cool phone model or some expensive equipment. But it turns out that my average-priced phone also supports this technology. I thought about it, I don’t know the principles of how it works at all. It seemed to me that this technology is still quite “far” from the average person, but it is already nearby and completely 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 for it to charge. The accessory is based on the operating principle of an induction coil.

Wireless toothbrushes have been using wireless charging for a long time. The technology has traditionally been plagued by problems of low efficiency and slow charging, but these weren't critical shortcomings for a toothbrush or electric razor that you only use for a few minutes every day. Using inductive charging is safer from the point of view that there is no wire to short out and you won't accidentally touch areas with poor insulation with wet hands.

This method of energy transfer has become very popular recently. 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 food outlets, and shopping centers, which will allow phones and tablets to be charged 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 this name in honor of the term of Eastern philosophy and means the flow of energy. 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 a smartphone is discharged. We have to urgently look for a way out. Soon, wireless charging modules will appear in all public places, as well as in 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”. 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 appears 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 the battery capacity of tablet computers and phones. It should be noted that tablets and smartphones require different amperages. A wireless charger for a phone produces a current of 1 ampere, and for a tablet computer - 2 amperes. When choosing an accessory, be sure to pay attention to these characteristics.

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 a few centimeters, the voltage in the induction coil will drop sharply, and the device will go into active operation mode. As soon as the smartphone’s battery is charged, a corresponding signal will switch the charger into the background. We can conclude that modern wireless accessories for replenishing battery capacity are energy efficient.

Even more graphs and formulas

Some users mistakenly believe that Qi wireless charging may be harmful to health. The fact is that magnetic radiation is not ionizing. In terms of its effect on the body, it is similar to a mobile phone signal, a Wi-Fi signal, or a radio signal. At the same time, the mobile network signal that comes from the tower is stronger and continuous, 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 can be convenient, but the short range is a problem. This dramatically 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 inductive charging options have been able to achieve longer transmission distances. Disadvantages prevent the spread of this too powerful radiation of the above mentioned technologies. You might get burned or worse. It is difficult to say who will take the palm in this market. The first candidate is Apple because the company has patented a device that can supposedly charge from up to one meter away. The Wireless Power Consortium is also constantly looking for better options. And then there's Intel, which recently announced that it's working on integrated magnetic device technology that will fit inside a laptop and distribute power to nearby smartphones and peripherals.

sources

They have wireless charging capabilities: the flagship model charges over the air out of the box, and for the Lumia 820 you need to purchase a replacement case with wireless charging capabilities.

Devices with wireless charging have already been shown to the world, for example, the Touchstone charger for Palm Pre, Powermat for iPhone, and inductive charging from Energizer. But unlike these chargers, which are built to their own specifications and therefore incompatible with other devices, we use the Qi standard - the only globally accepted wireless device charging interface created by the Wireless Power Consortium, made up of more than 100 different companies.

Qi standard designed to transfer energy to various devices using magnetic induction. Technically, this is very similar to the solution used to charge electric toothbrushes.

How does this work?

In simple words, a base station consists of an induction coil that creates an electromagnetic field when an alternating current is applied. The device that needs to be charged contains a similar coil that can capture this field, converting the resulting energy into direct current, which is used to charge the battery.

If we consider the process in more detail, then in wireless charging the transmitter ( transmitter) consists of a current converter ( ac-dc power converter), master devices ( drivers), transmitting coil ( transmit coil), potential and current reading ( voltage and current sensing) and controller ( controller). Receiver ( receiver) contains the receiving coil ( receive coil), rectifier ( rectification), voltage regulator ( voltage conditioning) and controller ( controller).

Energy is transferred from the transmitter to the receiver through an interconnected magnetic field created by the flow of alternating current through the transmitter coil. If the receiver coil is in close proximity, a significant portion of the transmitter power lines will pass through the receiver coil, creating an alternating current in the receiver, which is then converted to direct voltage.

You can view an interactive presentation with a detailed description of the technology on the WPC website.

• The charger may consist of several transmission coils that are activated depending on the position of the device on it that needs to be charged.
• The Qi standard supports a data transfer protocol between chargers and charging devices at a speed of 2 kbit/s. Now, using this protocol, information is transmitted from the device being charged about the required level of electricity for full charging, as well as messages that the device is charged.

Energy efficiency

Qi wireless chargers are approximately 80% energy efficient. It is worth understanding that it is simply impossible to achieve 100% energy efficiency; for standard wired chargers this figure ranges from 75% to 95% at best.

Safety

Regarding the safety of wireless chargers, we can state that we use non-ionizing frequencies that have no harmful physiological effects. The Qi 1.1 standard includes detection of foreign objects in the range of the charger, providing additional safety of use; Charging is only possible with Qi-compatible devices. Also, our chargers and smartphones have built-in safety mechanisms based on thermal control.

The future of wireless charging

Following the publication of the low-power (five-watt) Qi specification in August 2009, in 2011 the Wireless Power Consortium began work on expanding the specification to mid-power, allowing power increases of up to 120 watts. Despite the fact that the first specification is enough to charge phones, the new Qi standard will be able to provide not only charging of smartphones, but also, for example, tablets that require more power.

Thanks to the Wireless Power Consortium, the wireless charger ecosystem is evolving at a very fast pace. So, we have entered into agreements with Virgin Atlantic and The Coffee Bean & Tea Leaf, where soon all tables will be equipped with built-in chargers: the phone will be charged simply by lying on the table while you drink your coffee. In Russia, we are also negotiating cooperation with various businesses in order to introduce the same tables with wireless chargers in their establishments as soon as possible.

In addition to the main charger -

Nowadays, technology has become available that allows you to charge phones without using a cable. Its advantage is that this procedure is faster and easier, and you do not have to connect your smartphone to the network every time - you just need to place the device on top of the wireless charging pad.

There are various competing standards for this technology. The most popular of these is Qi, which is now supported by companies such as Samsung, Google and Nokia. However, more and more manufacturers are starting to use it in one form or another.

Which phones support wireless charging?

Some smartphone models have built-in wireless charging (their ratings are presented below). For other devices, this will require replacing the back cover or case. Qi components are produced based on specific phones, so if you connect them yourself, you should make sure that you choose a compatible model.

If a dedicated wireless charging cover is not available for your smartphone, you can use a universal adapter that allows you to use this technology even for older devices.

What do you need to know about wireless charging?

As noted above, the leader is currently the Qi standard, which is used in most Android devices today. The technology works by using magnetic induction, allowing energy to be transferred from the platform to the phone's battery. The Qi standard, whose name means “air” or “flow of spiritual energy” in Chinese, was created in 2008 and began to be developed simultaneously with the participation of 206 companies, including Microsoft, Samsung and Sony.

When talking about which devices support wireless charging, we should also remember the less common PMA standard. It also works due to magnetic induction, but its distribution range is slightly lower. In June 2014, the developers of the PMA standard partnered with Duracell to place charging platforms in select public places in the United States to promote the technology. If this idea proves viable in the future, it is possible that more smartphone manufacturers will start using this standard.

If we talk about which phone models support Qi-standard wireless charging, then the choice will be very large. Even if your Android smartphone doesn't have this technology built-in, you can purchase a universal Qi receiver that costs only about $15. Despite its bulkiness, it will add significant convenience to you when using the gadget. The device attaches to the back of your device, which can then be placed on any Qi-compatible charging platform. Regarding the question of which phones support Qi wireless charging, it is worth noting that there is a receiver available for sale for the iPhone (models 5, 5s and 6), which is also receiving positive reviews. Its cost is about $30.

Which phones support wireless charging (list of gadgets)

For those interested in the new technology, it will be useful to know the rating of devices that have built-in Qi standards.

The most famous model in this regard is the one that is currently available for around $200. According to user reviews, this is one of the best Android devices in principle. This device is also a leader in the use of wireless charging. The smartphone is compatible with both Qi and PMA technologies. Thanks to its sleek design, good speed and large 16-megapixel camera, this phone beats the iPhone in some ways. The commercially available Qi charger has a good long cable for connecting to the network. Its edges glow light blue while charging and turn green when charging is complete.

Among the devices that can be charged wirelessly are the following:

• Samsung Galaxy Note Edge.
• Samsung Galaxy Note 4.
• Google Nexus 6.
• Motorola Droid Turbo and others.

Other Samsung models

Analyzing which Samsung phones support wireless charging, one cannot help but remember that this model also simultaneously supports both standards - Qi and PMA. The attractive curved body shape and convenient screen allow owners to instantly access messages and other important data, and the built-in adapter does not impair the use of the device in any way. If the gadget itself can be purchased for about $300, the cost of the Pad for charging will be about $40.

Also belongs to this category of devices. This smartphone with an innovative curved screen offers very strong graphics performance on a bright display. Its screen size is significantly larger than other devices, so battery drain is correspondingly faster. This model doesn't integrate wireless charging directly into the back of the phone, but there is a special Samsung Qi-enabled cover available on sale that replaces the standard back of the device. This accessory costs approximately $25 and is available in two color options: jet black and snow white.

If you ask which phones support wireless charging in general, you will notice that this technology mainly affects gadgets with high hardware capacities, for which the ability to quickly charge them is especially important.

Based on this, it is not at all surprising that it is also equipped with the described technology. This gadget is distinguished by high multitasking, fast and high-quality camera and high brightness of the 5.7-inch screen. In order to charge it wirelessly, you will need a special case. It's available for about $30 and comes in two colorways.

However, Samsung is not the only manufacturer using this technology on a large scale. What other brands of phones support wireless charging? Let's look at it below.

Other brands

Google Nexus 6 has an almost 6-inch screen and is equipped with a high-power processor, so it especially needs the ability to quickly and efficiently recharge. Qi technology is built in right out of the box, so there is no need to buy an additional cover or case. This gadget is quite expensive - about $500, but fans highly appreciate its hardware capabilities along with Android 5.0. All this offers users a high level of comfort. Despite the fact that there is no special platform for wireless charging, the universal component will do the job perfectly.

When talking about which phones support wireless charging, we can’t help but mention a model like the Motorola Droid Turbo. This smartphone with a screen of just over 5 inches has a 21 megapixel camera and many built-in functions. Its battery life is approximately 9 hours during active use, so the built-in Qi technology is very useful. There is also a special charger for this model, which places the phone in a vertical position. This means that you can continue to use the device while charging.

Brand "Sony"

As already noted, the new technology is most actively used by manufacturers such as Samsung, Google and Sony. Which Sony phones support wireless charging? First of all, this is the Sony Xperia Z3 - a waterproof gadget that, with active use, lasts up to 12 hours without recharging. Its screen is highly bright, and its speakers provide loud, luxurious acoustics. Despite the fact that its cost is about $400, the device is widely popular. The wireless charging cover will have to be purchased separately and costs over a hundred dollars.

Is it possible to adapt your smartphone?

What phones support wireless charging without having the technology built-in? If your device does not natively support Qi, you can separately purchase and install an adapter on it and use a universal wireless charger. Depending on the brand of the gadget, you can connect the adapter via a micro-USB port (on the Android platform) or a lightning bolt (on an iPhone).

Universal wireless charging adapters

If your phone is not listed above, then you need a universal adapter and a wireless charger. You can get them for phones with micro USB ports (like Android) and lightning ports (like iPhone). In this way, you can update and improve almost all devices available for sale. If we talk about, for example, which Xiaomi phones support wireless charging, then with the above method you will be able to charge even 5-year-old models without a cable.

Universal charger

Once you've made sure that your phone supports wireless charging (either through built-in functionality, using a special cover, or by connecting an adapter - it doesn't matter), you'll need to purchase a wireless charger.

Nowadays, there are many such Qi technology devices available in different sizes, shapes and colors. You can buy such a component not only for use at home or in the office, but also for a car, and even a portable Qi battery. If you purchased a smartphone that supports wireless charging, it is advisable to choose a charger specially designed for it. If you don’t have one or you’ve updated your gadget yourself, finding a universal device won’t be difficult.

In short: you can take it!
The purpose of this review is to provide basic technical specifications, not to write a novel. I got B's in Russian and literature, but I didn't like essays. If you find any errors, write to me and I will correct them. And in general, as the Chukchi would say: “It’s yours to want to buy a product, mine is yours to write a review.”

Background. Order
I decided to get a wireless charger for my Chinese phone (a Samsung Galaxy Note II clone). I chose the cheapest options. As a result, I ordered separately a universal charger and a receiver with a micro USB connection. They arrived in regular bubble bags. A white USB cable, 80 cm, is included with the charging transmitter.


Specifications

Charging-Transmitter:

Input voltage: DC 4.6-5.5V
Inputcurrent: 1000-2000mA
Driven load: 5W
Charging efficiency: 75%
Operating temperature: 0-45
Humidity range: 45-85%RH
Charging frequency: 100-200KHz
Power distance: 5mm
Dimension: 155 x 84 x 9 mm
Electric energy transition: 72%
Weight: 104g
Light status: 1.Red led: standby; 2.Blue(or Green) led: charging; 3.Flashing: voltage/current/temperature anomalies

Receiver:

Input: 5V
Output: 1000 mA
Size: 69x44 mm

Testing:
First of all, I decided to measure the current during normal charging of the phone. For this I used a popular USB tester and the Ampere program. To my surprise, the data turned out different. I don’t know what to blame, perhaps the program makes incorrect measurements.

I don’t know who to believe, but I will rely on the program’s readings.
In Standby mode, the red LED glows barely noticeably, the tester shows zero current consumption (in fact, it is less than 50 mA, there is nothing more precise to measure). Therefore, you can safely leave the charger in standby when there is no need to charge the phone.
When you put the phone down, charging is activated and a moderately bright blue LED lights up.
In charging mode, the transmitter consumes about 780 mA (according to the tester).

The phone receives about 540 mA (according to the program).

For my phone, the difference is not big, so it doesn’t take much longer to charge wirelessly. For those whose phone directly consumes about 1 A, for those the wireless option will take twice as long. During operation, the charger and the phone do not heat up significantly, it feels warm, about 30-40 degrees.

A few words about the receiver.
Achtung! When purchasing, pay attention to which direction the micro USB connector on your phone is facing. On aliexpress I came across the receiver in two variations.

The thickness of the receiver is not uniform. The main area has a thickness of 1 mm, at the location of the microcircuit it is 1.45 mm (measured with a caliper). Fits perfectly for my phone. The lid closes tightly and nothing sticks out. True, I had to cut off the latch on the inside so as not to crush the cable. The cable is very thin, only 0.2 mm. I can’t show you photos with the phone, because the only camera is the phone itself.

At the end of the charge, the transmitter continues to glow, consumes about 600 mA and remains warm. Since the phone stops consuming energy, everything goes to the unwanted electromagnetic field.

Total:

Pros:
- Cheap
- Universal
- Quite thin receiver
- There are no problems with positioning; a slight displacement of the receiver and transmitter does not stop charging.

Cons
- No automatic shutdown at the end of charging
- Short USB transmitter cable, only 80 cm.
- The receiver outputs about 500 mA, instead of the stated 1000 mA.
- USB is constantly busy. To connect anything to the phone, you have to remove the cover. It will be difficult to charge your phone via cable. To transfer files you have to use Bluetooth or WiFi.

I'm happy with the purchase, now I don't need to reach for the cable and try to get into the phone connector in the twilight. I recommend it to everyone for whom charging time is not critical.

P.S. No cats, dogs, cockroaches or other pets!

I'm planning to buy +17 Add to favorites I liked the review +10 +23