wireless charging

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wireless charging

Transferring electrical power to a portable product by placing it in a cradle or on a flat charging surface. There is no cable to plug in, and although wireless charging used to always take much longer than wired, fast wireless has improved. However, fast wireless methods are likely to be slower than the fastest wired chargers.

Nevertheless, in all cases, wireless charging is convenient. For example, in an office, a smartphone can be dropped onto a desktop charging pad throughout the day when not being used. The Wireless Power Consortium and the AirFuel Alliance govern the major protocols (see Qi wireless charging and AirFuel). Another addition to wireless charging is the product line from Energous (see WattUp).

Closely Coupled Induction (Qi and AirFuel)
Operating at kilohertz frequencies, the Qi and AirFuel Inductive (formerly PMA) technologies create a magnetic field between the transmitting coil in the power source and the receiving coil in the target device. Devices must be within approximately 7mm of the charging pad. Depending on the number of transmitting coils in the charger, a phone might have to be moved around a bit to align the coils and establish a connection. Qi is the most widely used.

Closely coupled charging can cause nearby metal objects to become uncomfortably warm, which is why there is a warning notice on automobile console chargers to not place metal objects such as keys and coins on the pad.

Loosely Coupled Induction (Resonant Coupling)
Operating at megahertz frequencies, the transmitter and receiver coils are highly tuned, and devices can be an inch or more away from the charger. The greater distance is advantageous in automotive and under-table implementations. However, the farther away the two coils, the longer it takes to fully charge.

AirFuel Resonant (formerly Rezence) and Qi 3D are examples of Loosely Coupled chargers. Non-certified loosely coupled Qi chargers are also available. See fast wireless charging, Qi wireless charging and AirFuel.

No Metal Contacts
An early approach to wireless charging, the toothbrush is dropped into its charging base. Using inductive transfer, power is transferred without a metal plug and socket.

Sixteen-Coil Charger
The ZENS Liberty wireless charger has 16 overlapping coils (exposed in this illustration) so that two devices can be casually dropped on the pad with freedom of placement. (Image courtesy of ZENS, www.makezens.com)

Charging in a Vehicle
Many models of GM vehicles include a wireless charging mat on the center console, supporting both Qi and PMA methods. The ridges in the mat allow air to flow, because the center console is over the driveshaft and absorbs heat.

Add-On Wireless Charging in the Car
In 2013, iOttie debuted the Easy Flex system for certain smartphones. The dashboard mount (top) is wired to the car's DC power outlet, and an antenna coil (bottom) is lined up with the phone's internal battery terminals.
References in periodicals archive ?
Energous Corporation (Nasdaq: WATT) is leading the next generation of wireless charging - Wireless Charging 2.0 - with its award-winning WattUp technology, which supports fast, efficient contact-based charging, as well as charging over-the-air.
Being certified with Qi, a wireless technology that uses inductive charging, the BOOSTaaeUP Wireless Charging Dock has been engineered to be Qi-compatible, allowing it to also charge phones, tablets, and other accessories with Qi technology.
"We expect the new 2H19 iPhone models will support two-way wireless charging. Though the iPhone is not the first high-end smartphone to be equipped with two-way wireless charging, this new function could make it more convenient for users to charge the new AirPods and create a better integrated user experience of the iPhone and AirPods," Kuo wrote in his note to investors.
Huawei's Reverse Wireless Charging You've got enough power on your Huawei Mate 20 Pro for yourself and a friend too!
The Philips Dual Wireless Charging Pad will be on display in the Innovation Awards Showcase, and at Jasco's booth at the upcoming CES 2019.
Public bus deployment allows Aircharge to further extend its wireless charging ecosystem, already including public venues and office spaces.
The database also revealed that the Pixel Stand will have fast wireless charging support.
The Belkin BoostUp Wireless Charging Pad also has a non-slip surface, plus it allows wireless charging even for devices with thin, lightweight cases.
Lifeworks has just launched its lighting category, and products include this LED mood light with Qi wireless charging and touch control.
Powermat, the wireless charging technology pioneer, has announced it will become the newest Wireless Power Consortium (WPC) member, the company said.

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