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An AC adapter or AC/DC adapter (also called a wall charger, power adapter, power brick, or wall wart) [1] is a type of external power supply, often enclosed in a case similar to an AC plug. [2] AC adapters deliver electric power to devices that lack internal components to draw voltage and power from mains power themselves.
Laptop charging trolleys, also known as laptop trolleys or laptop carts, are mobile storage containers to charge laptops, netbooks and tablet computers en masse. The trolleys are predominantly used in schools that have replaced their traditional static ICT [ 1 ] suites of desktop computers with laptops, but do not have enough plug sockets in ...
After previous connectors were deprecated in USB 3.2, the new USB-C plug has become a new standard for charging (and data transfer) over USB. [13] In the European Union, the Radio Equipment Directive 2021/0291, requires new smartphones to use USB-C as a universal charger by the end of 2024, and laptops by 2026. [14] [15]
External power supply could send data about itself (power, current and voltage ratings) to the computer. For example, genuine Dell power source uses 1-Wire protocol to send data by third wire to the laptop. The laptop then refuses a non-matching adapter. [36] Some computers use a single-voltage 12 V power supply.
A battery recall in August 2006, as a result of a Dell laptop catching fire, caused much negative attention for the company though later, Sony was found responsible for the manufacturing of the batteries, however a Sony spokesman said the problem concerned the combination of the battery with a charger, which was specific to Dell. [46]
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Nokia 2-mm DC Charging Interface Specification [3] 4.65–9.3 V Nokia DC-096 (0.48×2.1 mm on socket side) Nokia AC-3 charger Nokia 2-mm DC Charging Interface, used in Nokia phones and Bluetooth headphones 2.35 0.70 9.5 A EIAJ-01 0–3.15 V Kobiconn 3218-EX Lumberg 1636 01 Kobiconn 0307-EX (inline)
The charger may have temperature or voltage sensing circuits and a microprocessor controller to safely adjust the charging current and voltage, determine the state of charge, and cut off at the end of charge. Chargers may elevate the output voltage proportionally with current to compensate for impedance in the wires. [3]