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 Inductive)
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.

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 ?
PowerSquare's in-car wireless charging solution eliminates the need to search for power cords or charging cables to power-up each handheld device.
The research and development of wireless charging technology is majorly focused towards two directions viz.
Wireless charging is based on the principle of magnetic resonance, or Inductive Power Transfer (IPT) - the process of transferring an electrical current between two objects through the use of coils to induce an electromagnetic field.
The iON Wireless Qi Charging Pad is a wireless charging dock for Qi wireless compatible smartphones and cases.
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ClickPress, Wed Jan 21 2015] Wireless Charging Market by Technology, Range, Component (Transmitters and Receivers for Various Devices), Application (Consumer Electronics, Defense, Healthcare, Automotive, and Industrial), and Geography - Analysis and Forecast to 2013 - 2020
Audi joins Daimler, Toyota, Jeep and others who have already implemented Qi wireless charging in current and future car models.
Wireless charging has been on the market for a while, but only now is its impact going to be reverberated globally.
NEW YORK -- A recent report on the prospects for wireless charging systems for mobile phones says that the technology is poised to become much more widespread.

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