Wireless charging: how does it work and is it worth using?

Wireless charging technology has become an integral part of smartphones and other electronic devices in recent years. Instead of traditional wires and cables, being able to simply place your phone on a special surface and watch the battery charge feels like magic. "Wireless charging" refers to the way in which power is transferred from the charging station to your device without any physical

What is wireless charging and how does it work?

Wireless charging, although it looks like a modern innovation, is actually based on the principles of physics that have been known for more than a century. The technology is based on the principle of electromagnetic induction - the same principle that electrical transformers work on.

In simple terms, the wireless charging process works as follows:

the coil inside the charger creates an electromagnetic field when connected to a power source

when a phone with compatible wireless charging is placed on top of the charger, a second coil inside receives this electromagnetic field

this field induces an electric current in the second coil

the phone's electronics convert this current into direct current that charges the battery

The most popular wireless charging technology today is the Qi (pronounced "chi") standard developed by the Wireless Power Consortium. The Qi standard ensures that devices from different manufacturers are compatible with each other, meaning you can charge a Samsung phone with an Apple charger and vice versa if both support the standard.

It is important to understand that wireless charging is not truly "wireless" in the usual sense - the charger still needs to be connected to a power source with a cable. However, the user does not need to connect any cable directly to the phone or other device, which is the main convenience of this technology.

History of wireless charging

The idea of ​​wireless energy transfer was born in the 19th century. towards the end of the century, when scientist Nikola Tesla began experiments with electromagnetic induction and wireless transmission of electricity. But only in the 21st century. In the early 1990s, this technology became sufficiently advanced to be integrated into everyday consumer devices.

The first commercial wireless chargers appeared around 2009-2010, and in 2012, Nokia (now Microsoft) released the first smartphone with integrated wireless charging, the Lumia 920. Since then, the technology has been adopted by most major manufacturers, including Apple, Samsung, Huawei, and others.

Wireless Charging Compatibility: Devices and Standards

Before investing in a wireless charger, it's important to make sure your device is compatible with this technology. While many newer high-end smartphones have built-in wireless charging, older models or lower-end phones often don't.

Major manufacturers of devices that support wireless charging:

Apple : All iPhone models starting from iPhone 8 (2017) and later

Samsung : Galaxy S series phones from S6 (2015), Note series from Note 5, newer A series models

Huawei : Most flagships, including P series and Mate series models

Xiaomi : Mi series flagships and other high-end models

Google : Pixel 3 and above

OnePlus : Starting with the OnePlus 8

In addition to smartphones, wireless charging is also becoming popular among other electronic devices:

wireless earphone cases (Apple AirPods, Samsung Galaxy Buds, etc.)

smart watches

tablets

e-cigarettes and other smaller electronic devices

Qi standard and other technologies

Although the Qi standard dominates the wireless charging market, other technologies also exist:

Qi : the most common standard supported by most manufacturers

MagSafe : a magnetic wireless charging system developed by Apple that allows devices to be precisely aligned for optimal charging (used on iPhone 12 and later models)

PowerShare / Wireless PowerShare : Samsung and other manufacturers' technology that allows the phone to act as a wireless charger for another device

If your phone does not have a built-in wireless charging function, you can sometimes use special adapters. These are slim devices that plug into your phone's charging port and allow you to charge it wirelessly. However, these adapters are not convenient for everyday use and can affect the design and usability of the phone.

Learn about compatible wireless chargers

Advantages and disadvantages of wireless charging

Like any technology, wireless charging has its strengths and weaknesses. It's important to understand them so you can decide if this technology is right for your needs.

Advantages

Convenience: no need to search for the right cable or connect it to the phone - just place the device on the charging station

Fewer wires: reduce the confusion of cables on the desk or nightstand

Charging multiple devices: some chargers can charge several devices at the same time

Longer life: less wear and tear on the charging ports because they are used less often

Resistance to dust and moisture : less risk of dust or moisture entering the phone through the charging port

Aesthetics : modern wireless chargers often have an attractive design that looks good in the home or office

Universality : the Qi standard allows the use of chargers from different manufacturers with a variety of devices

Disadvantages

Slower charging : compared to the wired alternative, wireless charging is usually slower

Heat generation : the process generates more heat, which can shorten battery life

Positioning sensitivity: the device must be placed precisely on the charger, otherwise charging will not work or will be ineffective

Less efficient: wireless charging consumes more energy than wired because some of the energy is lost as heat

Compatibility issues with cases: thick, metal or magnetic phone cases can interfere with wireless charging

Cannot be used while charging the phone: although it is technically possible to use the phone when it is on the vertical charger, but the charging stops when the phone is picked up

Higher energy consumption : EU recommendations note the higher energy consumption of wireless charging

Speed and efficiency compared to wired charging

Wireless charging has traditionally been significantly slower than wired charging. Early wireless chargers only provided 5W of power, while standard wired chargers already offered 10-15W. However, the technology is rapidly improving:

Modern fast wireless chargers can reach 15W-20W power

Apple MagSafe chargers for iPhones offer up to 15W charging power

Some Samsung phones support up to 15W wireless charging

Xiaomi and other manufacturers are experimenting with even more powerful wireless chargers (25W-50W)

Despite the progress, wireless charging is still less efficient than wired charging. Studies show that around 30-40% of energy is lost during wireless charging (compared to wired charging). This means a higher electricity bill and a greater impact on the environment.

Safety, Myths and Real Use

The Internet is full of myths about wireless charging, so it's important to separate fact from fiction:

Myth : Wireless charging damages your battery.

Fact : Certified wireless chargers are not harmful to batteries. Heat generation can theoretically have a negative effect on long-term battery life, but many newer devices have protection systems to regulate the charging process.

Myth : Wireless charging is dangerous to health due to the radiation emitted.

Fact : Wireless chargers emit a weak electromagnetic field, the strength of which decreases rapidly with distance. This field is significantly weaker than many other electronic devices used every day and is not considered dangerous to health.

Myth : The phone can be used as usual during wireless charging.

Fact : While you can technically use your phone while it's on a wireless charger, it's not convenient and the charging stops when you move the phone. Also, intensive use of the phone while charging can cause overheating.

Learn more about the energy consumption of wireless charging

Choosing the right wireless charger: what to look for

With many different wireless chargers on the market, it is important to know what aspects to pay attention to before making a decision:

Charging power

The power of the charger (measured in watts, W) is one of the most important parameters that determine the charging speed:

5W chargers: standard, slowest overnight charging

7.5W-10W chargers : medium speed, sufficient for most Apple devices (not MagSafe)

15W chargers : fast charging standards, suitable for newer Samsung and other devices

20W+ chargers : super fast charging solutions, only supported by some recent devices

It is important to note that the phone charging speed depends not only on the power of the charger, but also maximum wireless charging power is supported from the phone itself. For example, an iPhone 13 with a standard Qi charger will charge at a maximum of 7.5W, even if you use a 15W charger.

Format and Design

Wireless chargers come in a variety of shapes and designs:

Flat chargers (pads) : the classic shape where the phone rests horizontally. The simplest and often the cheapest.

Stand chargers : hold the phone in a vertical position. Handy to use when you want to see notifications or use facial recognition.

Multi-charging stations : Can charge multiple devices at the same time, such as phone, watch and headphones.

Car mounts with charging : installed in the car so you can follow the navigation and charge your phone at the same time.

MagSafe Compatible : chargers designed specifically for iPhones with magnets for precise positioning.

Quality and certification

When choosing a wireless charger, it is important to pay attention to:

Qi certification : ensures that the charger meets industry standards

Manufacturer reputation: reliable manufacturers such as Anker, Belkin, Samsung, Apple ensure better quality and safety

Safety certificates: CE mark in Europe, UL certificate in the US indicates that the product meets safety standards

Protection against overheating: quality chargers have integrated protection systems

Additional functions: LED indicators, automatic shutdown after full charge, fans for heat control

Compatibility with cases

Not all wireless chargers work equally well with phone cases:

Many chargers can charge the phone through a thin (up to 3-4 mm) non-metallic case

Thick, stretchy or rubber-coated cases may have problems due to excessive distance between the charger and the phone coil

Metal or magnetic cases block wireless charging

Cases with integrated metal plates (for magnetic car mounts) are incompatible with wireless charging

Some newer wireless chargers can charge through thicker cases thanks to stronger coils and better electromagnetic energy transfer technology.

Reverse wireless charging

Some newer smartphones (especially flagships from Samsung, Huawei, and others) have a feature called reverse wireless charging. This allows the phone to become a charger for other compatible devices:

You can charge another person's phone by placing it on the back of your phone

It is convenient to charge wireless headphones or smart watches

It can be a lifesaver in emergency situations when another device runs out of battery

However, reverse charging is not very efficient - it is slow and drains the battery of the "donor" phone heavily, so it is recommended only in special cases.

Discover reliable charging solutions

Real use, myths and future trends

Wireless charging is already changing our daily habits and relationship with technology. Although this technology is sometimes romanticized or overly criticized, real-world use reveals interesting aspects.

How wireless charging changes the habits of using phones

The prevalence of wireless charging creates new habits:

Shorter but more frequent charges - the phone is automatically charged as soon as it is placed on the desk or bedside table

Less use of fast charging functions, less stress about the battery level

Wireless charging zones are created in workplaces and public spaces, replacing traditional "charging corners"

Car manufacturers are integrating wireless chargers into their vehicles

Wireless charging myths

Let's explore some more common myths about wireless charging:

Myth : Wireless charging only works with the latest phones.

Fact : Some phones have wireless charging support since 2015 or even earlier.

Myth : Wireless charging is always slower than wired charging.

Fact : While this is often true, today's fast wireless chargers can match standard wired chargers in speed.

Myth : Wireless charging will completely replace wired charging.

Fact : In the near future, wireless charging will likely complement, but not completely replace, wired charging, especially when it comes to fast charging technologies.

Future perspectives

Wireless charging technology is developing rapidly, and we can expect interesting innovations:

Longer-range charging : companies like Xiaomi and Motorola have already introduced wireless charging solutions that work at a distance of several meters

Higher speed : 50W-100W wireless chargers are becoming a reality, closing the gap with wired charging speeds

Integration into furniture : integrating wireless charging technology into tables, lamps, car interior elements

Increasing efficiency : new technologies aim to reduce energy losses during charging

Versatility : a greater variety of devices that support wireless charging, including laptops and household appliances

The European Union is also actively monitoring the progress of wireless charging technologies in order to set standards that ensure efficient use of energy and reduce environmental pollution.

Wireless charging in public spaces

Conclusion

Wireless charging, although still a developing technology, already offers attractive convenience and ease of use. While the technology isn't perfect — charging speeds often lag behind wired alternatives and efficiency is questionable — the pros outweigh the cons for many users.

Especially newer phones and chargers support faster wireless charging and are more efficient than previous generations. Wireless charging is especially useful in situations where convenience is more important than maximum charging speed - for example, at night by the bed or at work, where the phone is often placed on the table.

Before investing in a wireless charger, make sure your phone supports wireless charging and find out the maximum charging speed it can reach. Choose products from reliable manufacturers with Qi certification and safety certificates.

Technology continues to improve, and we can expect wireless charging to become even faster, more efficient, and more common in the future. If you value convenience and want to reduce the clutter of cables in your life, wireless charging can be a great solution.

Frequently Asked Questions

Which phones support wireless charging?

Most high-end smartphones (newer iPhone models, many Samsung, Xiaomi, OnePlus phones) have a wireless charging feature. Check your phone's specifications or search for Qi compatibility information.

Is wireless charging slower than wired charging?

Yes, wireless charging is generally slower, but newer chargers and phones support faster wireless charging, closing the gap with wired charging.

Can I use my phone while it is charging wirelessly?

Yes, especially if you're using a stand-up charger, but moving the phone the wrong way can cause it to stop charging.

Does wireless charging harm the phone's battery?

When used properly, wireless charging is safe and does not significantly affect battery health compared to wired charging.

Can I wirelessly charge my phone with the case?

Mostly yes if the case is thin and non-metallic. Thick or metal cases may interfere with charging efficiency.