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The replacement must match input and output voltages, match or exceed current capability, and be fitted with a matching connector. Many electrical products are poorly labeled with information concerning the power supply they require, so it is prudent to record the specifications of the original power supply in advance, to ease replacement if the original is later lost.
Careful labeling of power adapters can also reduce the likelihood of a mixup which could cause equipment damage. Some "universal" replacement power supplies allow output voltage and polarity to be switched to match a range of equipment. Adapters which can also be used with motor vehicle and aircraft power see EmPower are available. Four-way X connectors or six-way star connectors , also known as spider connectors , with multiple plug sizes and types are common on generic power supplies.
Other replacement power supplies have arrangements for changing the power connector, with four to nine different alternatives available when purchased in a set. RadioShack sells universal AC adapters [ when? This allows many different configurations of AC adapters to be put together, without requiring soldering. Philmore and other competing brands offer similar AC adapters with interchangeable connectors. The label on a power supply may not be a reliable guide to the actual voltage it supplies under varying conditions.
Many low-cost power supplies are " unregulated ", in that their voltage can change considerably with load. If they are lightly loaded, they may put out much more than the nominal "name plate" voltage, which could damage the load. If they are heavily loaded, the output voltage may droop appreciably, in some cases well below the nominal label voltage even within the nominal rated current, causing the equipment being supplied to malfunction or be damaged.
Supplies with linear as against switched regulators are heavy, bulky, and expensive. Modern switched-mode power supplies SMPSs are smaller, lighter, and more efficient. They put out a much more constant voltage than unregulated supplies as the input voltage and the load current vary. When introduced, their prices were high, but by the early 21st century the prices of switch-mode components had dropped to a degree which allowed even cheap supplies to use this technology, saving the cost of a larger and heavier mains-frequency transformer.
Some universal adapters automatically set their output voltage and maximum current according to which of a range of interchangeable tips is fitted; tips are available to fit and supply appropriate power to many notebook computers and mobile devices.
Different tips may use the same connector, but automatically supply different power; it is essential to use the right tip for the apparatus being powered, but no switch needs to be set correctly by the user. The advent of switch-mode power supplies has allowed adapters to work from any AC mains supply from to V with an appropriate plug; operation from standard 12 V DC vehicle and aircraft supplies can also be supported.
With the appropriate adapter, accessories, and tips, a variety of equipment can be powered from almost any source of power. A "Green Plug" system has been proposed, based on USB technology, by which the consuming device would tell the external power supply what kind of power is needed. In early laptop computers, the power supply units were internal like in desktop computers. To facilitate portability by sparing physical space and reducing the weight, power supply units were externalized.
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. The USB connector and voltage has emerged as a de facto standard in low-power AC adapters for many portable devices.
The trend towards more-compact electronic devices has driven a shift towards the micro-USB and mini-USB connectors, which are electrically compatible in function to the original USB connector but physically smaller. In , a USB Power Delivery Specification was proposed to standardize delivery of up to watts, suitable for devices such as laptop computers that usually depend on proprietary adapters.
The ITU recommendation was expanded and updated in June, The European Union defined a Common external power supply for "hand-held data-enabled mobile phones" smartphones sold from , intended to replace the many incompatible proprietary power supplies and eliminate waste by reducing the total number of supplies manufactured.
In Larry Page , a founder of Google , proposed a 12 V and up to 15 A standard for almost all equipment requiring an external converter, with new buildings fitted with 12 VDC wiring, making external AC-to-DC adapter circuitry unnecessary. From Wikipedia, the free encyclopedia. Type of external power supply. For other senses of this term, see Battery charger.
For the European standard, see Common external power supply. This section does not cite any sources. Please help improve this section by adding citations to reliable sources. Unsourced material may be challenged and removed. December Learn how and when to remove this template message. See also: DC connector and Coaxial power connector. Energy portal.
AC power plugs and sockets describes the usual sources of power for an AC adapter Adapter Battery eliminator Coaxial power connector has extensive coverage of the profusion of coaxial DC power connectors in use. Common external power supply describes standards for mobile phone battery chargers.
Patent ". Google Patents. Power Electronics Technology. Penton Media, Inc. Archived from the original on 15 July Retrieved The Digital Village, Ltd. Archived from the original on 11 June Tom's Hardware. Archived from the original PDF on International Telecommunication Union. Other manufacturers place a few details.
To learn more about this equipment, contact us and request a quote. It's very important to know which adapter goes with what device. Having so many chargers gets frustrating and if they come separated from the device they are intended for it can lead to a dangerous situation. To know more about this electrical equipment and the bulk pricing that is available contact a supplier to discuss your needs and they will find a suitable solution.
If you're interested in wholesale pricing our suppliers work with small businesses and can assist. These electrical devices are portable so you can leave your charging dock at home and charge your device. Contact a supplier for a price list and specifications that are suitable for you. Bulk pricing is available. Power Adapters. Supplier Types. Product Types. Ready to Ship. Output Type. Xed Power Adapter products available.
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