How Does Wireless Charging Work? (Explained)

These days, everything is going wireless, and so does the charging. Gone are those days when you had to carry long and tangled cables with you to charge your devices.

Instead, you can buy a compatible wireless charger for your devices and enjoy living a wire-free life.

While a lot of people are adopting this new technology, most of them are still clueless when it comes to the basics and working of wireless charging.

You might have seen that many wireless charging devices come with the same power output as wired ones.

Ever wondered how actually the device is sending power to your device? Need not worry because we have got you covered.

In this post, we have talked about everything related to wireless charging, so you must read this post till the end if you want to know more about it.

We are not talking only about the wireless charging phones but everything related to this technology, including the modules on which it actually runs.

A simple search on the internet will give you a list of portal phone charger that comes with a wireless charging facility, but you won’t be able to understand its tech value until you know about this technology.

So, don’t wait and read everything about wireless charging technology to make it easier for you to buy wireless chargers.

What Is Wireless Charging?

Wireless Charging Process

Wireless charging, which is also known as Inductive Charging and Cordless Charging, is basically a method to transfer power from chargers or power stations to the devices without using a cord/cable.

This technology uses electromagnetic induction for wireless power transfer to charge the devices easily.

While it was invented many years back, a lot of companies have started adopting it in today’s era to cut the cost of producing cables.

Also, it is very feasible for the users as they don’t have to carry cables and worry about buying new cables because the old ones got damaged.

It not only cut the costs but also charges devices faster than the regular wired chargers.

Adaptation and History of Wireless Charging

Wireless Charging Concept

M. Hutin and M. Le-Blanc were the real inventors of “wireless charging,” and they did propose this method back in 1894.

They made this method available only for electric vehicles, but because of less interest from the car manufacturers, the idea was left only in the papers.

Later, in 1977, John E. Trombly registered the first patent for the “Electromagnetically Coupled Battery Charger“.

The patent was adapted to help miners in charging their headlamp batteries.

In 2008, a company named Fulton Innovation established a consortium named Wireless Power Consortium (WPC) that promotes this technology.

Then in 2010, the same company established the first wireless charging standard, named “Qi Standard“.

How Does Wireless Charging Work?

Wireless Charging Working

The transmission of power through two revolving coils is the basic foundation of inductive charging.

The first coil is located within the charging pad, which must be connected to an electrical outlet.

When voltage strikes the coil, it generates an alternating current (AC) by creating an electromagnetic field.

When the second coil (which is available on the device that you are trying to charge) hits that field, it accomplishes the circuit and transforms it to direct current (DC).

The Direct Current is further used by the device to charge its own battery like it does when you use a wired charged with the power outlet.

Currently, there are 3 different types of wireless charging techniques available out there.

Here’s a quick introduction to them:

  • Charging Pads – These devices feature non-radiative charging, so they are safer than other wireless charging devices. But these devices can’t transmit data if the charger and device are not physically attached.
  • Charging Bowls – You can keep the charger and the device a few centimeters away from each other for charging if you are using these types of chargers. A lot of devices use this feature this transmission is already available out there and is most popular among mobile users.
  • Uncoupled Radio Frequency (RF) – It is the most advanced wireless charging technique as it can be used to charge devices placed several feet away from the charger. This technique allows “trickle charging”, which means the device can be charged at the same speed as its self-discharge rate.

Wireless Charging Standards In 2022

Wireless Charger

Standards in wireless charging refer to the operating systems on which the connected devices run.

Currently, there are four types of wireless power transfer standards available out there, named: Qi, Rezence, Magne Charge, and SAE J2954.

Each of them is used for wireless power transmission, but they use different types of protocols and mechanisms to connect and share power with the devices.

This means it is not necessary for the devices working on Qi standard will work with the devices running on other standards and vice-versa.

Obviously, there are some exceptions, and some devices are compatible with multiple standards.

Here’s a quick introduction to these inductive charging standards:

Qi Standard – Wireless Power Consortium (WPC) developed this standard back in 2008.

Devices using this standard can charge devices placed at a distance of up to 4 cm (1.6 inches).

This system can be seen in various charging pads out there as it utilizes the physical connection between the charger and the device for faster wireless transmission.

Rezence – This standard works on the principles of magnetic resonance, and it is developed by Alliance for Wireless Power (A4WP).

The maximum power output from the devices using this standard can be up to 50 watts.

Also, this standard allows the powering devices to connect with up to 8 devices at once to charge them.

Magne Charge – Magne Charge standard is developed for electric vehicles and can transfer power up to 50 kW at once, while the most common is the Level 2 charger with 6.6 kW.

A lot of car manufacturers out there are using this standard to let the customers charge their vehicles easily.

This standard is very safe, too, as it can work even when fully submerged in water.

SAE J2954 – SAE International developed this wireless power transfer standard, and it is also used in electric vehicles.

There are 3 types of classes available in this standard, 1, 2, and 3, that features charging speed of 3.7 kW, 7.7 kW, and 11 kW, respectively.

This standard is pretty efficient when it comes to transferring speeds and accuracy.

Advantages and Disadvantages of Wireless Charging

Every technology has both advantages and disadvantages, and the same goes for wireless charging too.

While it might sound very interesting to many people out there, you must know the negatives of it to get the best out of it.

Below we have shared some of the pros and cons of wireless charging, which we think every user must know about.

Advantages of Wireless Charging

  • Less Messy – Since wireless charging does not involve any cord connection, you are free from carrying long and tangled cables everywhere you go. Although you will have to carry the charging dock with its cable, they are very durable than regular charging cables.
  • Universal Compatibility – Every cable connection is based on a two-sided connection, and there are different types of cables out there. That makes it impossible to charge every device using a single cable, while this isn’t the case with wireless charging.
  • Safe and Secure Charging – You don’t have to worry about damaged connections and being vulnerable to electricity. Every wireless charger works in an enclosed environment, so your connections and you stay from getting any type of shock while using it.
  • Advanced Technology – Wireless charging is getting revamped every day, and many new standards are already in the making. Some wireless chargers out there offer the same charging speed as that of a wired one. We can expect these to offer faster-charging speed in the coming years.
  • Multiple Device Charging – A single wireless charging dock can power multiple devices at once with the same speed, so you can charge your devices quickly. You don’t have to plug the devices into multiple sockets to charge them.

Disadvantages of Wireless Charging

  • Performance Issues – While wireless charging is a highly-advanced way of powering up your devices, the technology is still in development mode. Only a few standards are available out there, so you might have to deal with a few bugs and issues with these devices.
  • No Portability – Wireless chargers do charge the devices without the need of plugging the devices into the charger, but the dock must be connected to a power socket. There are no portable wireless chargers available, and that kills the entire idea of wireless charging.
  • Can’t Use The Device While Charging – As we said above, the distance between the charger and the device being charged can only be a few centimeters as of now, you can’t really use the device while it is charging. This can be really frustrating to the users who like using their mobile devices while it is charging.

Types of Wireless Charging In Electric Vehicles & Their Working Modules

Mobile phones and electric vehicles are two major things that are getting support for wireless charging around the world.

You might have seen various electric vehicles like scooters and cars coming with wireless charging, and the list of phones that support wireless charging is endless.

Here are the three best and currently-used technologies used in-vehicle wireless charging.

  • Stationary Charging – This system works when the vehicle is parked at a single location for a certain period of time. Usually, the charging cable is connected to a port available under the car and another to the charging station. The main advantage of this system is that everything remains safe from electric shock. Many of these systems have been proven to work in the rain and when completely submerged in the water.
  • Dynamic Charging – Vehicles that use this system can be charged even when they are moving. The first prototype for this way of charging was introduced back in the 1980s. This system utilizes the roads and the paths on which the vehicle is moving to charge it. A type of inductive rail or coils is placed on the track that can wirelessly transfer the power. It is a pretty expensive model, and the efficiency is very low, which is why it is not being used by commercial companies.
  • Semi/Quasi-Dynamic – It works with vehicles that move at a very slow speed but stay in motion. For example, taxi rank. The technology is currently in development mode, and a set of wireless charging lanes and paths has been set up for testing purposes. This system uses conductors with a long range of connectivity to charge the vehicles. While this technology can be really helpful, tracking the power usage and the motion of vehicles is a major roadblock in its development.

Wireless Chargers Buying Guide & Its Future

Since you’ve got a piece of pretty neat information on wireless charging and its working system, you might be able to buy a perfect wireless charger for your devices.

It can be really frustrating for the buyers to hold on to a wireless charger without knowing its technical information.

Most of the online stores where these products are listed do provide support to answer all basic questions related to these chargers.

You can always connect with the support team to know about the compatibility, speed, and other things to make sure it is the right product to charge your devices.

Below we have listed a few things that you must keep in mind while buying a wireless charger to make sure your money is spent on the right device.

  1. If you are getting a wireless charger for phones, then make sure the power output matches your device’s power input level. Consider getting wireless charging pads that offer QuickCharge with at least 36W power output.
  2. Consider chargers with LED indicators. These indicators will help you know if the device placed on the charging pad is aligned properly or to know when it is completely charged. Almost every mobile device offers a feature that wakes up the screen when it is fully charged, but this is definitely an advantage.
  3. Know the type of wireless charger you want to buy. Flat charging pads on which the device is placed and angled charging stands are two basic types of wireless chargers available for mobile devices. You can buy any one of these based on the location where you want to use and place the wireless charger.

THE FUTURE OF WIRELESS CHARGING:

Wireless charging is slowly becoming the new normal, and soon we can expect more companies and devices to adapt this technology to power their devices.

A lot of manufacturers are working on different wireless charging modules and systems, so we can expect some of them to come up with an innovative and efficient method to transform this technology.

Also, we might love to see public places adapting this system and allowing people to charge their devices without being stuck at a single location.

We have read about some prototypes to transform an entire wall into a wireless charger, and if that becomes a reality, your hotel rooms, flights, trains, buses, and even a car can become a charger itself.

Scientists and engineers are constantly working on this technology, and in the coming years, we might see innovations that will transform the entire way we charge our devices and vehicles.

FAQs Related To Wireless Charging

Is Wireless Charging Bad For Phones?

Definitely not. Both wireless and wired charging uses different standards and it completely depends on your needs, and which one you want to prefer.
The only limitation with wireless charging is being very limited to certain devices and you must have a compatible device in order to charge it with a wireless charger.

Does Wireless Charging Work Through A Case?

Yes. Wireless charging works with a case and you don’t have to keep the device and charger physically attached in order to make them work.
However, the distance can only be a few millimeters because the standards are not yet highly advanced to transfer the power at a longer range. Though there are several consequences of it too.

Is Wireless Charging Slower With A Case?

Having obstacles between the wireless connections will cause transfer wastage.
The transfers will be slower when you have something between the charger and the device being charged with it.
It is always recommended to remove the case from your phone or device when you are charging with a wireless charger.

Does Wireless Charging Produce More Heat Than Wired Charging?

Wireless chargers use the copper coil and do not regulate the charging speed, so they can heat up your device a little more than the wired chargers.
However, the Qi Standard has rules for such problems and your device will stay fine until you are using a wireless charger that is certified and has passed the Qi Standard checks.

Final Words

So, this is all we had to share about wireless charging and we hope you have understood this technology very well from this post.

The coils and modules used in a wireless charger play the most important when it comes to power transfer and how capable the device is in charging the product you are using with it.

We do understand that wireless chargers are pretty expensive than the regular wired ones but they do offer you the freedom from long and tangled cables.

If you like trying and getting indulged in new things, then you must try buying a wireless charger to try it on your own.

You can also contact us if you want more information on this topic or for recommendations of some of the best wireless chargers.

Leave a Comment