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 ?
Until now, power supplies had to be over-engineered to accommodate high levels of peak power use," said Balu Balakrishnan, president and CEO of Power Integrations.
ON Semiconductor (Nasdaq: ONNN), a leading global supplier of power management solutions, today unveiled its fourth GreenPoint(TM) reference design -- this one for 220 watt (W) LCD-TV power supplies.
SHENZHEN, China -- A leading global supplier of power management solutions, ON Semiconductor (NASDAQ: ONNN) today unveiled a GreenPoint(TM) reference design for CRT-TV power supplies that delivers standby power of less than 1 watt (W).
The devices feature latch-up immunity and a fast drive speed of 15 nF in 27 nS, which equip them with the ruggedness, high-power switching speeds and sharp edges needed to drive large MOSFETs and Insulated Gate Bipolar Transistors (IGBTs) in demanding, high-efficiency Switch Mode Power Supplies (SMPSs) and other high-speed, high-current switching applications.
NASDAQ: MCHP), a leading provider of microcontroller and analog semiconductors, today announced a family of 16-bit dsPIC(R) Digital Signal Controllers (DSCs) for common, multi-loop switch-mode power supplies (SMPSs) and other power-conversion applications.
OEMs and solution providers rely on Arrow's value-added services to deliver power products, including AC to DC low, mid and high solutions, DC to DC converters, and external wall mount desktop power supplies.
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.
Ciprico's arrays with the redundant power supply feature dual load- sharing hot swap power supplies -- either of which will power the array in the event of a failure.
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.