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 ?
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Manufacturing Technology of Uninterrupted Power Supply (UPS): This chapter is mainly divided into three major parts as Development, Analysis and Trends of Uninterrupted Power Supply (UPS) Manufacturing Technology.
A second option would involve a fix in space, attaching a working power supply to the spectrograph and leaving the faulty supply intact but disconnected.
Because this method of locating ground faults uses operating power supply voltage, there is no need to isolate the coil from the power supply.
Table 6 - Worldwide Embedded AC-DC Power Supply Market, by Design Type (millions of units) .
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As the leading distributor of power supply products in North America, Arrow creates customized power supply products and offers the services of nine power specialists who help customers simplify the selection of "off-the-shelf" power supply solutions from 13 franchised suppliers.
The January 2006 downgrade of APS by Fitch Ratings was triggered by rejection of the company's surcharge request for recovery of deferred power supply costs, and adoption of PSA provisions by the commission that are less favorable than had been anticipated by Fitch in its previous ratings (See the Fitch press release dated Jan.
With Tri-State's members' fairly rapid load growth averaging 4% per year, partly reflecting the energy and commodity-based industries in certain of the members' service territories, Tri-State has been in the position of playing catch-up with respect to maintaining adequate power supply to meet load requirements.
GreenPoint(TM) is ON Semiconductor's family of high-efficiency power supply reference designs that meet existing or emerging energy efficiency standards.
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