Recently, wireless charging has become more and more popular among people due to its multiple benefits. Not only can it keep us away from a mess of data cables, but it is also compatible with plenty of devices, making it a convenient solution for daily charging. Now, you will be exposed to a wide selection of wireless chargers when searching for a wireless charger. However, which is the best may be a puzzle for us. Today, we will have a deeper talk about wireless charging, with our hope of making it clear to you.

How wireless charging works 

Many people may mistakenly regard wireless charging as the result of the technological advancements of the 21st century. However, the basic principle of wireless charging can be traced back to the late 19th century, when Nikola Tesla successfully carried electricity over the air through a resonant-inductive coupling process to power light bulbs in his New York City laboratory. This process works by establishing a magnetic field between a transmitter (which sends electricity) and a receiver (which receives electricity). Tesla eventually invented and patented the Tesla coil tower, which shot energy via air. He wanted to use this technology to build a wireless power grid to make it apply on a larger scale. His dream, however, was never accomplished during his lifetime.

Thanks to the modern advancements of the 21st century, the basic principle of inductive charging is applied to create smartphone wireless charging.

However, how does inductive wireless charging work in modern devices? The wireless charging device is built with an electromagnetic coil in a charging base. It is also called a transmitter coil that sends out a signal to search for a receiver coil that is inside your smartphone. When it senses one, a magnetic field will be created between the transmitter coil and the receiver coil. The receiver in your phone will pick up the energy emitted by the transmitter coil through the magnetic field and transfer it back into the battery.

Dual Coils and Single Coil 

As more advancements in wireless charging are made, wireless chargers provide a higher charging efficiency and a better user experience. However, it still can not charge as efficiently as wired charging due to the drawback in the distance between the receiver coil and the transmitter coil. The greater the distance between the receiver and the wireless charger's transmitter, the slower it will charge. In essence, if the gadget is not directly on top of the wireless charger, the magnetic field will find it difficult to send electricity to it. Even a millimeter or two off can cause the charging process to slow down.

To strive to solve this drawback, expanding the charging area becomes a feasible solution. Concretely, increasing the charging area is to increase the area of the transmitter coil, which can make the receiver coil inside the phone easily align with the transmitter coil to reduce the distance deviation. There are two schemes for expanding the area of a transmitter coil, including dual coils and single transmitter coils. Both of them are believed to enhance charging efficiency. 

Among them, the dual-coil scheme is to expand the charging area by increasing the number of coils, but it means a higher cost and more difficulties in research and development. Even a giant like Apple has not been able to overcome the problem of AirPower, let alone other teams that do not have an advantage in capital and technology.

As for the single-coil scheme, it works by creating a larger coil to expand the charging area. The track-shaped coil is a popular solution to achieve a larger coil. By changing the coil structure and shape, the charging area of a single coil can be increased. More than that, this type of coil can make the center offset range expand to ±22 mm, while the traditional circular coil solution is only ±8 mm. Compared with dual-coil and multi-coil schemes, its cost is lower.

In terms of wireless chargers, they can be classified into two types: wireless charging pads and wireless charging stands. Dual coils are widely used in wireless charging stands to create a larger charging area. This can make the receiver inside the phone well align with the charging area whether you put the phone sideways or vertically. On the contrary, a single coil is usually used in wireless charging pads. And using a track-shaped coil can create a larger charging zone to guarantee high charging efficiency.

Qi Standard

Qi standard (pronounced ‘chee’, the Chinese word for ‘energy flow’), created by WPC, is a technical certification for wireless charging devices. The WPC uses a network of independent, authorized test labs located all over the world to conduct safety, interoperability, and usability tests on a variety of properties, each of which may need many different test techniques. Only Qi Certified products can go with the Qi logo. By now, as the mainstream technical standard for wireless charging devices, the Qi standard has been adopted by 230 technology manufacturers, including Apple and Samsung. It was primarily used to charge smartphones, but now this standard can also be widely used to charge consumer devices including headphones, smartwatches, cameras, and more. 

The Qi standard offers a convenient and simple charging experience. It makes wireless charging compatible with most wireless charging devices. Any Qi-certified device, regardless of manufacturer, region of origin, or version of the standard utilized, can function with any Qi-certified wireless charger. Besides, through multiple test procedures, Qi-certified devices feature high safety. 

6 in 1 Multifunctional Wireless Charger

BWOO, which has 20 years of electronics R & D experience, is dedicated to providing high-quality electronics for people around the world. Recently, it released its latest item: BWOO WL-22 6-in-1 multifunctional wireless charger. It is a super wireless charger with three wireless charging areas and 15W outputs. Let’s make it detailed for you. 

Perfect Specifications For High-efficiency Charging 

BWOO WL22 wireless charger delivers a high-efficiency charging experience with excellent specifications. Each wireless charging base is built with a transmitter coil, promising a high-speed current to make every device charge quickly and steadily, even when it charges four devices simultaneously. More than that, the charging base for smartphones is equipped with dual coils and anti-magnetic interference chips, making sure your phone charges at a more steady speed, delivering a more efficient charging experience. Besides, the dual-coils scheme creates a larger charging area which allows you to place the phone in any way without lowering the charging speed because it helps the receiver inside the phone align with the transmitter coils to guarantee high charging efficiency. 

Powerful Charging Ability to Simultaneously Charge Four Devices 

BWOO WL22 6 in 1 wireless charger compacts wireless charging and wired charging by offering four charging interfaces, including three wireless charging interfaces and a Type-c port, which allows you to simultaneously charge four devices, such as your smartphone, smartwatch, earphones, and more. One-stop charging capability makes it a perfect companion for a business trip or traveling, letting you avoid a mess of data cables and delivering a tidy and easy user experience. 

Super Compatibility, Fast Charging 

The BWOO WL22 wireless charger supports a maximum output of 15W, which allows you to fast charge your devices and save time. In addition, it can work well even through a phone case, letting you charge your devices without taking off the phone case. Besides, it provides 18W input, allowing it to recharge at a high speed. Certified by the Qi Standard, this wireless charger feature super compatibility. It can work with any Qi-certified device, including iPhones, Android phones, AirPods, PS5, and more, bringing you the limitless joy of charging. 

Smart Protection Chips to Achieve a Higher Safety 

BWOO WL22 wireless charger features smart protection chips that offer multiple security protections, including over-current protection, over-power protection, over-voltage protection, etc., protecting your device from potential dangers. Evaluated by a series of safety tests, it meets all the international safety certifications, making it safe for use. Not to mention, it is also certified by Qi. 

All in all, wireless charging provides a mess-free and convenient experience. Plenty of advancements in wireless charging has greatly improved the charging efficiency of wireless chargers. Although it still has drawbacks, experienced manufacturers like BWOO can always provide high-quality wholesale wireless chargers for you with the best technology and solution. By now, BWOO has served in the electronics industry for 20 years. With its excellent quality and service, it has won recognition from people from more than 100 countries and regions. For more innovative products like wireless chargers, please follow our site.

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