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Inductive charging (also known as wireless charging or cordless charging) is a type of wireless power transfer. It uses electromagnetic induction to provide electricity to portable devices. Inductive charging is also used in vehicles, power tools, electric toothbrushes, and medical devices.
The proliferation of portable wireless communication devices such as mobile phones, tablet, and laptop computers in recent decades is currently driving the development of mid-range wireless powering and charging technology to eliminate the need for these devices to be tethered to wall plugs during charging. [172]
Laptops on this system will still charge batteries. Modern laptop batteries, however, include a temperature sensor that should compensate for the reduced cooling at altitude. This new system accepts various national power plugs and most laptop chargers will function properly at 120 V 60 Hz AC even if sold in 230 V 50 Hz AC markets.
When a laptop computer is operated while recharging, the integrated circuitry which controls the charging makes use of a power supply unit's remaining electrical current capacity. This allows supplying the device's components with power during usage while maintaining an uncompromised constant charging speed.
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This feature has also been implemented on some laptop docking stations allowing device charging even when no laptop is present. [82] On laptops, charging devices from the USB port when it is not being powered from AC drains the laptop battery; most laptops have a facility to stop charging if their own battery charge level gets too low. [83]
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