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.

power supply

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.
References in periodicals archive ?
Almost all these power supplies have two output terminals--positive and negative.
The 4U, 20-slot server features a variety of ISA or ISA/PCI backplanes, a single board computer, SCSI RAID controller, front-accessible redundant power supplies, and cooling fans, all resulting in five-nines reliability.
This 94-page report is highly quantitative and includes 30 tables of worldwide forecast data for embedded ac-dc power supplies for the period 2009 - 2014, and 48 graphs highlighting key findings and trends.
You can help by turning in failed circuit cards and power supplies for repair.
com/reports/c48684) has announced the addition of Frost & Sullivan's new report: World Programmable DC Power Supplies and DC Electronic Load Markets to their offering.
The Company concentrates on two major market segments: Components - power supplies, transformers, speakers, buzzers, converters and connectors; and Industrial Control and Power Devices (encoders and industrial power devices).
Delta, the world's number one provider of switching power supplies, is focusing on photovoltaic inverter design and production and desires to become a major player in the fast-growing solar energy system market.
The Intelligent Power-Supply Design Center offers design tools at each of four levels of digital integration into power supplies.
Commenting on the order, Richard Okada, President of RO Associates, said: "Securing this business represents a significant milestone for RO, and is a substantial commitment by our customer to the long term use of RO power supplies.
As a full-service representative and distributor firm, Electro Source will be responsible for selling Cherokee International power supplies and power consulting services into the Canadian territories.
TSI will be responsible for selling Cherokee International's power supplies and power consulting services in the mid-Atlantic territory of the United States.
We have added BEAR Power Supplies to our line card in response to a strong interest from our customers who require a rugged AC/DC converter with a very wide operating temperature range," said Priscilla McConnell, Vice President of Marketing for All American.