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Inductive charging pad for a smartphone as an example of near-field wireless transfer. When the phone is set on the pad, a coil in the pad creates a magnetic field [1] which induces a current in another coil, in the phone, charging its battery. Generic block diagram of a wireless power system
Qi (/ tʃ iː / CHEE) is an open standard for inductive charging developed by the Wireless Power Consortium.It allows compatible devices, such as smartphones, to receive power when placed on a Qi charger, which can be effective over distances up to 4 cm (1.6 in). [1]
Inductive chargers produce more waste heat than wired chargers, which may negatively impact battery longevity. [14] [better source needed] An amateur 2020 analysis of energy use conducted with a Pixel 4 found that a wired charge from 0 to 100 percent consumed 14.26 Wh , while a wireless charging stand used 19.8 Wh, an increase of 39%.
The MagSafe Duo charger can be folded when not in use. [20] [21] The charger came with a Lightning–to–USB-C cable, and Apple recommends their newer 30 W USB-C power adapter (released in 2018), and notes their older 29 W adapter is incompatible and can only charge one device at a time. [22]
A personal computer that does not have embedded Bluetooth can use a Bluetooth adapter that enables the PC to communicate with Bluetooth devices. While some desktop computers and most recent laptops come with a built-in Bluetooth radio, others require an external adapter, typically in the form of a small USB " dongle ".
Wi-Charge claims that this mechanism ensures that energy exposure to people, animals or unrelated objects is always below the maximum permissible exposure (MPE): "Sending energy over a distance, a beam always diverges, which is a bad thing as too little power is going in the right direction, and too much power splits and goes elsewhere.
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The OTG device is allowed to charge and initiate SRP but not connect. [7] A charger and an A-device that is asserting V BUS (is providing power) are attached. The OTG device is allowed to charge and connect but not initiate SRP. [7] A charger and a B-device are attached. The OTG device is allowed to charge and enter host mode. [7]