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. Wireless charging generally takes longer than wired charging, but it can be 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 are the products 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 7 mm 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.

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 ?
The AirFuel resonant ecosystem will provide wireless charging service in a variety of public venues including the airport, subway stations, hotels, restaurants, and shopping malls, making it easy for Chinese consumers and businesses to enjoy a world without wires.
An attractive promise of wireless charging is that you can just set your phone down on a surface and charge.
Alex Lidow, EPC CEO and Co-founder, added, "Our eGaN technology has been supporting the wireless charging market development with our business partners and customers worldwide for over three years.
Big Fun Market produces PMA standard Powermat compatible wireless charging receivers as well as selling PMA standard wireless chargers and battery kits manufactured by Powermat.
Conceptualized and engineered indigenously, PowerSquare is working with Automobile OEM's and Tier I suppliers to manufacture the module and provide a completely 'Made in India' wireless charging solution for cars in India.
Powermat is the wireless charging pioneer and leader, provider of the largest wireless charging network in the world, and at the forefront of inductive wireless charging technology development.
The major driving factors for the growth of wireless charging market are technological advancements in portable electronics and wearable electronic devices (such as smart-watches) along with increasing sales of electric vehicle across the world.
By 2018, the Munich-based automaker will roll out its cable-free charging for plug-in vehicles - confirming BMW's wireless charging pad system will be first made available on the plug-in 530e iPerformance car.
iFixit discovered that the glass back was thoroughly attached to the wireless charging pad.
BMW has confirmed that it will be presenting a wireless charging option for the upcoming 2018 BMW 5 series plug-in hybrid sedan.
Auto Business News-May 1, 2017--BMW's 530e iPerformance to have wireless charging
Reportedly, the Belkin Universal Wireless Charging Pad + Charger delivers greater flexibility by supporting two of the leading wireless power standards.

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