How Does A Contactless Charger Work Or How To Remake A Phone

2023 Author: Philip Bishop | [email protected]. Last modified: 2023-08-25 07:54

• Features of work
• What is Wireless Charging Function?
• Wireless Charger Standards
• Is it safe?
• Advantages and disadvantages of technology
• How to wirelessly charge your smartphone
• A few words about the transmitter
• Device manufacturers

Many users want to know what a wireless charger for a phone is and how easy it is to convert an ordinary phone into a wireless one. The device is based on induction current. In order for the system to work, an induction coil and receiver coil are required in the cell phone or other device itself. The first is connected to the power grid, the second, when close to it, creates a certain field, as a result of which the battery is charged. This method is based on the laws of physics. There are several standards, but they work on the same principle, the only difference is in the Hertz frequency at which the device operates.

Features of work

When the receiver enters the range of the coil, a special device catches it. A signal is transmitted, the charger turns on, that is, the field will not be created permanently, but only under two conditions - the coil is powered from the mains, the receiver is at a close distance from it. The signal itself can be given by a mobile device, for this it will use NFC after the contactless phone charger is within range.

The radius of the magnetic field created by the coil is usually small, it is only up to 10 mm, and the voltage is 5 watts, which is standard for such devices. It is enough for a charge, but it is not capable of causing harm to the surrounding living creatures. When interacting with the charger, the receiver coil is activated, which directs the received energy to the rectifier, through which it is transmitted directly to the battery of the charged phone. Roughly speaking, the principle of operation of wireless charging is to convert an electric current into a magnetic field and vice versa, but in a different place.

What is Wireless Charging Function?

Modern mobile phones may already have a built-in coil, for example, Nokia Lumia belongs to this family, other models receive a special cover for connecting a wireless charger. This option costs about 1,500 rubles. You can find a Chinese analogue, it will cost much less if you buy wireless charging from Aliexpress. Chargers without a wired system can be used in any room or car, where the manufacturer has provided such functions and installed the desired coil in the car.

Many manufacturers make specialty accessories, such as in-car music systems or home systems that can be equipped with a charging pad for mobile devices. There is also a wireless car charger. Such adapters can be installed in any car, and they will work from a cigarette lighter or a special socket, if one is provided in the car.

Wireless Charger Standards

There are several wireless charger standards that we will now look at:

• Qi standard: This type of wireless charging is the most common device. The protocol was developed by the WPC company, this format is used by many well-known cell phone manufacturers, for example, Nokia, Samsung, LG and others. The frequency of such devices is 100-205 kHz, which allows achieving an efficiency of at least 75-80%.

• PMA is the second standard used for wireless charging.

  its developer is Powermat. The device will operate at 277-357 kHz. Charging will take place faster, this standard is more popular in America.

• Rezence (A4WP) - the operation of such devices is based on mutual magnetic resonance. Thanks to this technology, the power of the device can reach up to 50 W, thanks to which wireless charging is universal, it is suitable not only for mobile phones, but also for larger devices, and it also allows you to place the gadget further from the coil.

Is it safe?

Many users are worried about whether the coil will harm human health; manufacturers claim that such a charger has no effect on the human body, even if it is in close proximity to it. It is worth noting that the electrical panel works on the same principle, it is in close proximity to the inhabitants of any apartment or house, while it does not cause any harm. Most wireless charging devices have a power of less than 5 watts, which is too little to affect even very sensitive equipment.

Advantages and disadvantages of technology

The main advantage of wireless chargers for smartphones is the absence of wires, in addition, it is universal for any phone model. This technology allows you to keep the jacks of mobile phones intact, they will not loosen from frequent use. No need to worry about buying wired chargers that break down constantly.

You can use such a device wherever there are sockets; many modern cars already have a platform for charging phones from the factory. The Ikea store already sells table lamps with a built-in induction charging unit. Many companies, such as Samsung and Nokia, have long been releasing similar devices and adapted phones with wireless charging. The charger itself has a long service life, it works much longer than usual. However, there are some disadvantages, which include the following:

• The efficiency cannot exceed 80%, part of the energy is lost, so charging takes a long time.
• The size of the device is quite large.
• You cannot use the phone while it is charging.
• Slight heating.

How to wirelessly charge your smartphone

Since the technology of such charging is quite new, only those phones that are adapted to it can work with it, have a special coil and rectifier. Many companies supply their new models with those, but what if your phone is not new, but you want to charge it remotely? To do this, you can remake a mobile phone with your own hands, the wireless charging scheme is relatively simple and will only require you to buy inexpensive Chinese modules.

Receivers are sold separately in the same way as the charging blocks themselves, so you can buy and install wireless charging on any smartphone with your own hands. A wide selection of jacks for any phone model and with different connections will help with this. The average cost is 100-150 rubles.

This is a small construction, resembling cardboard in width; the coil is small, an analogue can be seen in any store, something similar is used to prevent theft by gluing the coil to clothing. The phone uses a take-up coil. It can be placed under the cover and attached directly to the battery, or it can be located outside and soldered to the connector for a conventional charger.

To protect the coil, an ordinary thin silicone case will be sufficient when using an external receiver.

When choosing a contactless receiver, you need to pay attention to what brand the phone is: for example, there will be no problems with Samsung products, and Apple smartphones are quite selective in their chargers and will most likely work only from original ones. The solution can also be a universal wireless charger that connects with most smartphones.

A few words about the transmitter

It is important to see that the power supply is already more than 2 A (2000 ma), better even more, since there are losses. At lower amperage, charging will be very slow. For adequate operation, you will need to replace the cord from the charger kit, since not every USB cable can pass a full 2 A.

For inexpensive smartphone models, the usual inexpensive platform for 350 rubles is quite enough. and a native power supply.

I ordered myself in this store transmitters (transmitter). An ordinary one with one coil is enough to charge a Samsung phone with a 2000 mA battery.

Now, wireless chargers with support for fast charging are gaining popularity: Qualcomm Quick Charge 2.0, Qualcomm Quick. For them, you already need to look at the parameters that will be supported:

• Input: DC 5V / 2A 9V / 1.67A
• Output: DC 5V / 1.5A 9V / 1.3A
• Charging power: 10W (max)
• Conversion efficiency:> 73%
• Transmission distance: 6-10mm (max)

Device manufacturers

There are quite a few companies offering wireless chargers for cell phones. Factory counterparts are better than self-made models in that they will definitely work with your equipment, their execution is more accurate, and there will be no harm to the phone from the inept actions of the owner, who decided to upgrade his device to a more modern model, it is much easier to order all kinds of new wireless devices from Chinese friends …

The popularity of this type of charger is growing, so most of the well-known companies have launched their production. Each model has certain features, satisfies certain requirements of buyers, and is well suited to certain models of smartphones for which they are designed. If you take a branded charger, then its brand should ideally coincide with the brand of your smartphone, so the likelihood that the equipment will work correctly is much higher. For example, Apple products often conflict with Chinese crafts and require connection to the original. The most popular manufacturers include the following firms:

• Samsung is one of the most common brands that has established the production of wireless chargers a long time ago, so it has taken a solid position in the market. You can meet the products of this company in almost any store that sells mobile devices or accessories for them.
• LG produces both mobile devices and memory devices for them, you can buy a receiver and attach it to an old phone model.
• Nokia produces well-known high quality products, the Lumia lineup offers wireless chargers that fit almost all models of smartphones in this family. You can meet the products in any cellular salon.
• Apple uses this type of charger only for Apple Watch so far. The device itself is attached to the watch, so it is very convenient to use it, for phones until 2017 there was no such analogue, so their owners often resorted to self-re-equipment of devices. The iPhone 8 and iPhone X released last year are already equipped with this technology, so in some stores you can buy the chargers themselves separately.

In addition to well-known brands, a fairly large number of Chinese chargers are produced, often they do not have a well-known name, but they meet international standards adopted for these purposes, there are also quite cheap options.

However, when buying products, for example, on Aliexpress, you need to pay attention to the seller's rating, in addition to looking closely at the brand itself, it's good if it is even a little known or someone has already bought the device before you and left a positive review. As a rule, Russian consumers buy models that support the Qi wireless charging standard, since it is the most popular in our country, and most manufacturers of smartphones and other portable devices use it.

When choosing a charger, you need to pay attention to the number of Hertz from which they work, as well as watts. Some phone models, especially quite old ones, may be sensitive to electromagnetic fields, which is why the use of a contactless charger is not recommended. The phone may be damaged. For example, Samsung chargers are of high quality, therefore, as a rule, they are safe for any phones, the manufacturer makes them only in accordance with quality standards, uses only original spare parts.

One of the most popular chargers made in Korea is the Wireless Charging Pad. It belongs to the basic family of such devices, which is almost completely devoid of the disadvantages that the earlier generation of similar chargers had. This model is also convenient in that it is not required to place the phone on its site in any special way, its position does not play any role. It is quite convenient, you do not need to monitor how the mobile device lies, whether it has moved.

This type of device is provided for the popular Samsung Galaxy S6 smartphone, it works in the WPC standard. The positive aspects of this charging include the fact that it can be applied not only to the Galaxy family, but also to other model lines of the company. A distinctive feature of this development is its ability to quickly charge the battery, for example, it is possible to increase the charge up to 50% in a very short time, faster than with a wired method, this is important if you need a communication device urgently, and the battery is dead. You can also use such a charger in cases where the phone jack for a conventional unit is broken or you do not want extra wires in the room.

If we compare Samsung products in terms of their properties with Apple, it is worth noting that most devices from this company do not support this charging method, with the exception of several phone models and one watch model. In addition, the charger from Apple will not come into contact with smartphones of another brand.

Conclusion: a wireless charger for a cell phone is quite convenient to use, it is used in cars, but it may also have some disadvantages, in particular, it is not suitable for use in old phone models, and they need to be upgraded.

But if everything is ordered in China, then it is quite possible to keep within up to 500 rubles. And if you use cashback, you will also be able to save money, so by setting the transfer in the browser once, you can save up to 8% on purchases.

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