power supply

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power supply

[′pau̇·ər sə‚plī]
(electronics)
A source of electrical energy, such as a battery or power line, employed to furnish the tubes and semiconductor devices of an electronic circuit with the proper electric voltages and currents for their operation. Also known as electronic power supply.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

power supply

This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)

power supply

A system that converts AC current from the wall outlet into the DC currents required by electronic circuits. A computer power supply converts AC into multiple DC voltages. For example, 12 volts is commonly used for drives, while 3.3v and 5v are used by the chips and other motherboard components.

Switching Power Supplies
Power supplies known as "switching" power supplies are commonly used. Their name is derived from the type of circuit used to change the voltage. For more details, see transformer. See power adapter.


Typical Voltages
This monitor displays the typical three voltages generated by a PC power supply.







One Size Does Not Fit All
Like everything else in our high-tech world, power supplies come in myriad sizes and shapes; witness this table full of different units from Sparkle Power Inc. (www.sparklepower.com).







External "Bricks"
Laptops use an external power supply, called a "power adapter" or "power brick." It converts AC to a single DC voltage that goes to the laptop's internal power supply, which generates all other required voltages. External adapters are used to reduce the size and weight of the laptop, yet they typically ride along in the laptop case, adding back the weight after all.
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References in periodicals archive ?
A low power drain LED gives long battery life and the light can also operate from a mains adapter. Automatically switches off after 1 minute.
* An interchangeable international AC mains adapter kit with the PAL version.
Should sufficient sunlight not be available when the radio is needed, you can always recharge the batteries via the supplied mains adapter. The solar DAB radio is ideal for use in gardens, or on holiday.
Fully charged the Devo digital and FM radio provides six hours of DAB (digital) and 36 hours of analogue FM per charge, or play it continuously with the included mains adapter.
'Alternatively, dispense with batteries and use it with a mains adapter. Or stick to using low-tech netting and twigs to protect seed beds.'
In addition to a mains adapter, these balances have an internal rechargeable battery, making them completely portable.
Our prize includes a state-of-the-art Nokia mobile handset worth pounds 595, which records all messages and calls with a device which can be listened to from another phone, a Sony digital radio which has a surveillance camera and sound recorder, a keyboard with bugging device, a voice recorder disguised as a USB stick and a mains adapter with a bugging device that can listen to the surrounding sound in the room -which can be listened to live from anywhere in the world.
Better still, get a Standby Saver mains adapter and switch everything off with one touch of the remote (see www.standby-saver.co.uk)
It's got an eight inch TFT Display, Dolby Digital built-in speakers, headphones and mains adapter, and the player comes ready to use in a stylish carry/viewing case.
Phil Roberson, Regional Director of the U.K., HTC, said, "This pilot demonstrates that, if we inform our customers about the environmental impact of wasted phone chargers and the benefits of using the chargers and mains adapters that they already own, they respond positively to the message."