blog banner


ATX (Advanced Technology eXtended) is a motherboard configuration specification developed SFX; TFX; WTX; AMD GES; 5 EPS12V ATX also made the PS/2-style mini-DIN keyboard and mouse connectors Power Supply Design Guide, v ยท EPS12V Power Supply Design Guide v Insignia W ATX12V /EPS12V Power Supply: Designed to power select computers; W continuous power; ATX12V /EPS12V Specifications. We’ll answer PSU spec questions of modular vs. non-modular PSUs, EPS12V vv The EPS (Entry-level Power Supply) standard is.

Author: Akijar Netaxe
Country: Kuwait
Language: English (Spanish)
Genre: Marketing
Published (Last): 27 April 2010
Pages: 475
PDF File Size: 8.99 Mb
ePub File Size: 4.53 Mb
ISBN: 881-7-85472-224-5
Downloads: 51686
Price: Free* [*Free Regsitration Required]
Uploader: Kajik

Archived PDF from the original on April 1, Although a power supply with a larger than needed power rating will have an extra margin 22 safety against overloading, such a unit is often less efficient and wastes more electricity at lower loads than a more appropriately sized unit. By using this site, you agree to the Terms of Use and Privacy Policy. Using higher quality electrical components at less than their maximum ratings or providing better cooling can contribute to a higher MTBF rating because lower stress and lower operating temperatures decrease component failure rates.

Earlier computers requiring 3.

The main issues to consider are the following:. Views Read Edit View history. An additional wire referred to as ‘Power Good’ is used to prevent digital circuitry operation during the initial milliseconds of power supply turn-on, where output voltages and currents are rising but not yet sufficient or stable for proper device operation.

The desktop computer power supply changes alternating current from a wall socket to low-voltage direct current to operate the processor and peripheral devices.

Misquoted and misunderstood” PDF. The two rails involved are labeled on the power supply with a combined current limit. Other legacy connectors that are slowly being phased out of modern ATX motherboards include pin parallel ports and 9-pin RS serial ports.

Power supply unit (computer)

ATX Advanced Technology eXtended is a motherboard configuration specification developed by Intel in to improve on previous de facto standards like the AT design. The development of high-power and high-voltage transistors at economical prices made it practical to introduce switch mode supplies, that had been used in aerospace, mainframes, minicomputers and color television, into desktop personal fps12v. Most modern desktop personal computer power supplies conform to the ATX specificationwhich includes form factor and voltage tolerances.


Several direct-current voltages are required, and they must be regulated with some accuracy to provide stable operation of the computer.

Power supply unit (computer) – Wikipedia

The overall power draw on a PSU is limited by the fact that all of the supply rails come through one transformer and any of its primary side circuitry, like switching components.

It was used only on high-end Athlon MP motherboards. It was thought that in this configuration, cooling of the processor would be achievable without the need of an active heatsink. Another small power supply design with standard ATX specification connectors. Some of these PSUs use two different chokes, feeding the to the 3. The ATX standard followed some manufacturers design [ citation needed ] to have power supplies also supply a standby voltage, so that most of the computer system could be powered off after preparing for hibernation or shutdown, and sec back on by an event.

Standard ATX provides seven slots at 0. When the assignment of connectors to rails is done at manufacturing time it es12v not always possible to move a given load to a different rail or manage the allocation of current across devices. By using this site, you agree to the Terms of Use and Privacy Policy.

For instance, ATX 2. A number of manufacturers have added one, sped or three additional expansion slots at the standard 0.

The fan placement can be used to efficiently exhaust air from the processor and core area of the motherboard, making possible smaller, more efficient systems using common industry components. The connector pin pitch is 4.

The first active PFC circuits just delayed the inrush. Computer power supplies may have short circuit protection, overpower overload protection, over-voltage protection, under-voltage protection, over-current protection, and over-temperature protection.

Eps12g July 12, These power supplies were generally not capable of power saving modes such as standby or “soft off”, or scheduled turn-on power controls.

ATX – Wikipedia

Some power supplies come with sleeved cables, which besides being more aesthetically pleasing, also make wiring easier and have a less detrimental effect on airflow. A modular power supply provides a detachable cable system, offering the ability to remove unused connections at the expense of a small amount of extra electrical resistance introduced by the additional connector.

The ATX connector provides multiple wires and power connections for the 3. This is a minor revision from August From Wikipedia, the free encyclopedia. The Apple IIalso introduced inwas noted for its switched-mode power supplywhich was lighter and smaller than an equivalent linear power supply would have been, and which had no cooling fan. In addition, many ATX power supplies have an equivalent-function manual switch on the back that also ensures no power is being sent to the components.


Modern personal computers universally use switched-mode power supplies. Any other onboard interfaces such as serial and parallel ports had to be connected via flying leads to connectors which were mounted either on spaces provided by the case or brackets placed in unused expansion slot positions. The requirement was later deleted from version 2. All articles with unsourced statements Articles with unsourced statements from September Articles containing potentially dated statements from January All articles containing potentially dated statements Articles with unsourced statements from December Commons category link is on Wikidata.

The Apple II design by Atari engineer Rod Holt was awarded a patent, [2] [3] and was in the vanguard of modern computer power supply design.

However, some early model Athlon XP and MP boards including some server boards and later model lower-end motherboards do not have the ep1s2v connector as described below. Opposite the wire bundle is the back face of the power supply, with an air vent and an IEC C14 connector to supply AC power.

Later regulators managed all the 3. In other projects Wikimedia Commons. This eos12v became effective in February sepc Advantages of having an EATX motherboard is dual socket support. For other uses, see ATX disambiguation. Many eps122v supplies create their 3. A power supply rail or voltage rail refers to a single voltage provided by a power supply unit PSU.

Designed for dual CPUs, and quad double slot video cards. A multiple rail design does the same, but limits the current supplied to each individual connector or group of connectorsand the limits it imposes are the manufacturer’s choice rather than set by the ATX standard. Views Read Edit View history.