Wireless Charging Definition

Wireless Charging Definition

Wireless charging is wireless power transmission also known as wireless charging or cordless charging. Wireless charging is a technology that enables devices to be charged without cables. It usually involves two main components: a charging pad or mat and a compatible device equipped with a wireless charging receiver. The charging pad creates an electromagnetic field, which induces an electric current in the receiver coil located within the device, thus charging its battery.

What is wireless charging?

Wireless charging uses an electromagnetic field instead of wires to transfer power between two objects. Here, electricity is produced across a magnetic field using electromagnetic induction. Thus, the device is charged through the charging station. Power is transmitted through inductive coupling to an electrical device, which then uses that power to charge the battery or operate the device.

How exactly does wireless charging work? What other devices is it used for? And what are the advantages and disadvantages of this /Wireless charging? you can find answers in these blogs.

Can wireless chargers charge all phones?

If they support the same wireless charging standard (such as Qi), you can use any wireless charger with your smartphone. They don't need to be made by the same manufacturer—for example, you can use a Samsung wireless charger with an iPhone. Application for wireless charging. It's not just smartphones that can be charged, but the technology is increasingly being used for other devices as well. These include:

Smartwatches, Bluetooth headphones, and other wearables
Notebooks and tablets
Electrical tools (cordless screwdrivers and similar)
Service robots (such as vacuum cleaners and lawnmowers)
Electronic toys and drones.

Types of wireless charging

Before we look at how wireless charging works, let's take a look at what a wireless charging standard means. Standards dictate the different sets of operating systems with which devices are compatible. There are two main values: Qi and PMA. Although they work on the same principle, they have different transmission frequencies and connection protocols. For this reason, equipment conforming to one standard may not conform to another.

Qi Standard 

Developed by the Wireless Power Consortium, Qi is an open interface standard for wireless power transfer using inductive charging over distances of up to 4 cm (1.6 inches). The system uses a charging pad and a compatible device, which is placed on top of the pad and charging is conducted through inductive coupling. The Qi standard is incorporated into more than 140 smartphones, tablets and other devices. Mobile manufacturers producing devices conforming to this standard include Apple, Asus, Google, HTC, Huawei, LG Electronics, Motorola Mobility, Nokia, Samsung, BlackBerry, Xiaomi and Sony.

What is a Qi charger?

With wireless charging, the user does not need to carry a separate charger for the smartphone. This is why several standards were discussed at an early stage, one of them being the Qi standard for inductive charging.

What is the PMA standard ?

PMA (Powermat) wireless charging. Powermat is another charging standard that has launched with quite a bit of fanfare, with brands like Starbucks and McDonald's adopting Powermat at their public charging stations. The Powermat uses inductive charging to charge devices wirelessly, and the technology was later acquired by AirFuel Alliance (more on that below).
Basically, PMA works similarly to the Qi standard but specifies a different frequency range of 277–357 kHz and a maximum charging distance of 5cm. However, one problem with PMA is that it uses a different charging protocol than Qi, meaning that devices supporting PMA are not compatible with Qi charging pads and vice versa. As Qi became a more widely accepted standard, PMA began to disappear as Qi won the wireless charging battle. However, the company shifted its focus to industrial endeavors.

AirFuel wireless charging : 

 In 2015, the two major wireless charging standards, Qi and PMA, merged into a single standard called the AirFuel Alliance. And in 2017, Apple announced that its devices would use Qi for iPhone wireless technology, meaning the battle was almost decided in favor of Qi. The good news is that many wireless charging pads now support both Qi and PMA to support backwards compatibility. The alliance makes it easier for consumers who just want to charge their devices to stay away from wireless battles.
Magnetic fast charging. Wireless magnetic fast charging works in exactly the same way as.

inductive charging: 

By wirelessly transmitting an electromagnetic field between coils. It only aims to solve the speed issues of charging wirelessly versus tethered. Wireless fast charging uses a higher charging voltage, amperage to increase charging speed. However, not all devices support wireless fast charging, which is usually limited to newer devices. These pads are capable of fast charging pads.These pads can use different standards, such as quick charge, USB power deliveryThe numbers 10W, 15W, or 20W indicate the maximum power output of the charging pad, and these outputs are considered the wireless fast charging range. Established in 2012 by Procter & Gamble and Powermat Technologies, a suite of protocols for wireless power transfer can be advanced. Denoted by the electron "P,"  the PMA interface standard describes analog power transfer (inductive and resonant), digital transceiver communication, cloud-based power management. PMA attracts members from companies across a broad spectrum across the mobile device ecosystem and thus includes handset providers, service providers, chip suppliers, manufacturers, laboratories, and public institutions.

There are two main standards for wireless charging: 

Qi and Powermat. Qi (pronounced "chi") is a widely accepted standard used by many smartphone manufacturers, including Apple and Samsung.

Wireless charging can be enabled in how many forms?

Wireless charging can be enabled in three different ways.

Radio charging uses radio waves to transfer electricity.In this type of charging, the device uses radio waves to charge.

Inductive charging uses electromagnetic waves to transfer energy and charge devices wirelessly. Inductive charging requires the device to come into physical contact with a conductive charging pad that is directly connected to electrical power.

Resonant charging consists of a transmitting (transmitter) copper coil and a receiving (receiver) copper coil at the end of the device. Electrical energy can be transferred when the sender and receiver are close and set to the same electromagnetic frequency. Resonance charging can also be referred to as over-the-air charging.

How does wireless charging work?

Wireless charging is possible through electromagnetic induction. Electrical energy is transferred between two objects through a magnetic field, like a charger and a smartphone, meaning you no longer need wires to charge a device.

Wireless charging or induction Charging is based on Faraday's law of induction and Ampere's law. This coil is located at the charging station. The magnetic field induces current in a second coil, which resides in the device itself. The electric charge ensures that current will flow to the second coil. Wireless charging doesn't work completely without cables; the charging stations are still connected to the socket via a power cable and are constantly connected. But smartphones charge wirelessly. It just needs to be placed at the station. A charging station consists of a coil through which alternating current flows. This electricity creates a magnetic field. When a smartphone is in this magnetic field, it is charged. Basically, a distinction must be made between these 2 types of charging: inductive and resonant charging.

How do I use wireless charging?

Place the coil on the pad or pocket above the charging mark. The phone needs to be completely on the charging pad or in the charging pocket. It must be aligned correctly, or it won't work. You will see the charging symbol displayed while the phone is charging.

How do you use an inductive charging station?

You place your smartphone on the charging station, but you must make sure that you position the device very precisely. The charging process works only when the smartphone is over the coil of the charger. If the two coils are too far apart, the charging process is disrupted.

The contact surface of most charging stations is made with an anti-slip material to prevent the smartphone from slipping off the charging station. Some charging stations even have magnets to hold the smartphone in the correct position.Smartphone charging stations should be touched without covers, but for the charging process, most stations can only handle covers a few millimeters thick.

Some charging stations use different coils. These provide more flexibility in positioning the smartphone on the charger. Depending on the charging station, multiple devices, such as a smartphone and smartwatch, can be charged at the same time. However, these charging stations are much more expensive than a coil and are currently mainly used in automobiles.

To date, wireless charging is generally slower than wired charging. Devices in the Qi standard, in contrast, support a base power profile (BPP) of 5 watts, an enhanced power profile (EPP) of 15 watts, and a magnetic power profile (MPP) of 15 watts. Most companies, especially those leading the smartphone industry, have proprietary protocols that can support wireless charging power of up to 50 watts, which is very close to wired charging power rates.

Depending on the station, smartphones can only be moved a certain amount while charging. It limits the function while charging. But charging stations are also available where cell phones are located. It allows you to watch movies while charging the phone.

If you want to check the charging status of the battery and remove the smartphone from the charging station, the charging process will be interrupted. For this reason, many charging stations display charge status with LEDs, and users can easily see this without having to move or remove the device.

Wi-Tricity and wireless charging in vehicles

Dell released a Latitude laptop that includes resonant wireless charging from Watertown, Mass.-based company WiTricity, which licenses technology originally developed at the Massachusetts Institute of Technology (MIT). The Dell Wireless Charger offers up to 30W of charging power, so a Latitude laptop will charge at the same rate as if it were plugged into a wall outlet.

But WiTricity's main focus is the auto industry. According to Alex Gruzen, CEO of Vitricity, the company, which is part of the AirFuel Alliance, expects several electric car manufacturers to announce wireless charging for their vehicles. Electromagnetic resonant technology allows power to be transferred up to a distance of about nine inches from the charging pad. This will allow electric cars to be charged by parking on top of a large charging pad.

What devices can you charge wirelessly?

The first wireless charging was used for electric toothbrushes. Of course, your device needs to have a built-in 'receiver' to convert the electromagnetic field into current. Brands like Apple, Samsung, LG, Motorola, etc.The most widely used wireless charging standard is the Qi standard (pronounced chi), which makes it possible to charge all devices at Qi charging stations.If your device does not have this technology, you can use a specially designed one. Charger case with built-in wireless charging technology. The case communicates with your phone via a USB port inside the case. This technique is rather cumbersome and, therefore, not very popular. The big advantage of wireless charging is that you no longer need to plug in a charger.

Applications of Wireless Battery Charging

Multi-standard interoperability is preferred.Wireless charging can be accommodated with NFC and Bluetooth. Accessories: headsets, wireless speakers, mice, keyboards, and many other applications can benefit from wireless power transmission. Only wireless charging can enable that possibility.

Public access charging terminals: 

Systems for placing charging pads in the public domain must be kept safe and secure. But smart charging systems can go beyond stand-alone charging solutions. They can enable fast network connectivity and build charging stations.
Computer Systems: Laptops, notebooks, ultrabooks, and tablet PCs are all candidates for wireless charging as either hosts or clients. The possibilities are endless.

In-cabin automotive applications:

A wireless charger is ideal for charging phones. Since Bluetooth and Wi-Fi are required to connect phones to the vehicle's electronics, combining NFC with wireless charging enables the user to not only charge the phone, but also automatically connect to the vehicle's Wi-Fi and Bluetooth network.

Electric Vehicles: 

Smart charging stations for EVs (electric vehicles) are also coming up, but they require much higher power. Standards are under development.

Miscellaneous: 

Wireless chargers are finding their way into anything with a battery inside it. This includes game and TV remotes, cordless power tools, cordless vacuum cleaners, hearing aids and even cardiac pacemakers. Wireless chargers are capable of charging any device powered by supercapacitors (supercaps) or traditionally a low-voltage power cable. 

Wireless charging advantage 

Wireless charging facilities (no need to plug and unplug cables) offer several benefits, including potential water and dust resistance as there are no openings in the charging port. However, wireless charging typically charges devices more slowly than traditional wired charging, and charging performance may decrease if there is a distance between the charging pad and the device.If you don't charge your smartphone battery with a regular cable but just place your phone in a charging station, then you're charging it wirelessly. The technology behind wireless charging is electromagnetic induction.

Protected connections
Low infection risk
Durability
Increased convenience and aesthetic quality.

1. Wireless charging generally means a secure connection since the electronics do not corrode when enclosed and thus are away from water or oxygen. There is also less risk of electrical faults, such as short circuits, due to insulation failure, especially when connections are made.

2. Wireless charging increases the durability of a device as there is no need for plugging and unplugging the device, and thus there is much less wear and tear on the device's socket and connecting cables. This technology helps reduce the risk of infection. So in an embedded medical device, energy is transmitted through a magnetic field that passes through the skin, thereby avoiding the risk of infection by penetrating the skin.

3. Automatic high-power inductive charging of electric vehicles is known to pave the way for extending the driving range.

4. Eliminating charging cables offers more convenience and a greater aesthetic value.

5. Automatic wireless charging has higher reliability without relying on people to plug or unplug a device.

6. Autonomous vehicles, typically electric vehicles, rely on autonomous electric charging. Automatic operation of inductive charging will help solve this problem, and now the car can theoretically run indefinitely.

7. Inductive charging of electric vehicles at higher power levels allows electric vehicles to be charged while in motion (also known as dynamic charging).

Wireless Charging Definition: Related FAQ

1. How does wireless charging work?

2. What is the difference between the Qi and wireless charging?

3. Does the Qi charger damage the battery?

4. Is all wireless charging Qi?

5. Does wireless charging charge faster?

Wireless charging is one of the fastest charging methods and is becoming increasingly popular in cars. In this method, the car battery is charged automatically when it is empty using a special charging station. In this method, the battery is almost re-charged using special technology, helping to reduce the time it takes for the car battery to go from empty to full charge.