Question about Compaq Refurbished 280WATT POWER SUPPLY FOR PROFESSIONAL WORKSTATION 5100 Power Supply

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i wants to know about components based calculation of output capacity
( output watts ) of an computer atx smps
if i am not wrong the way of components based calculation like this
for example if we are using 2nos of power transistor mje-13007 having max output of 80 watts each it means 80x2=160 watts ????????
if im right then plz check this link they say`s this is 200w atx smps but they are using power transistor 2sc4242 ( 400v and 40 watts means 40x2= 80 watts ) ??????????????
plz guide me i m confused
satish rajput

Posted by on

    SATISH RAJPUT Dec 28, 2007

    i m agree with u ,
    in fact i m also findout the same answr
    now i know that if u wants to findout the max capacity of an psu u have to put the load according to voltage current etc , and with the help of amp meter u can see the out put results
    thanx dear
    satish rajput

  • gavasbalan Feb 19, 2009

    what is smps?difference between ordinary smps to computor smps?
    pls, give me good answer

    by gavas.



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Every device can be safely operated upto allowable temperature. If you design to remove heat, then for same power, temp would be low or for a particular temperature, it can cater more power handeling capacity. Here is the trick.
If the heatsink and force cooling is provided, the power rating can be easily increased. And this is the trick the company utilize the engineering to overdrive components. Even if insted of using high current schottky rectifiers like MBR3045WT (15A Each Channel) in low voltage side, they solder cathod of 1N5822 (3A Capacity)to metal plate and screwed to heatsink. But the transformers capacity is also reduced to using high frequency of SMPS 130KHz insted of earlier 66 or 33 KHz. I also found Good design Frontech 600Watt SMPS without HV line filter choke and without low voltage filtering capacitor.

The only testing is to connect load resistance to each voltage so that it must not fail. Another thing I can recomend, to check the bulky SMPS (heavy or weight high) during purchase as seal opening voids guarantee. Of course, seeing through vent hole will give you some idea if you are aware about electronics.

Posted on Jan 30, 2010

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Maximum output of any smps is not based solely on the type of power switching transistors used. One of the parameters which will be crucial is the Ic (Max collector current rating). But this by itself isn't the lone determining factor either.

Other design factors which will come into play are the switching transformer, its size and windings. A smaller transformer and smaller wire gauge windings will generally mean lower max power output.

Max power output measurements probably require a set of load resistors, volt and amp meters, monitoring the 3.3, 5, 12 volt lines.

I'm not an engineer, but have had numerous computer power supplies apart, repairing some, junking some. Quality of construction or lack thereof is generally obvious. PC Power and Cooling probably builds high quality units. There are plenty of cheap, low cost power supplies which frequently die after a year or two, sometimes taking a motherboard down with it.

Posted on Dec 22, 2007


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Hello Mkmanishbit2 hi, SMPS means switch mode power supply. The capacity of an SMPS unit is from 200 watts to 1500 watts, and some can be 2000 watts. Now for your Gigabyte Motherboard, a standard 350 watts unit will do, for medium end gaming, 500 watts will be enough, and for high end gaming, use the 800 to 1500 watts unit. Reminder the higher the watts number the higher the price, but the safer it becomes.

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Dimension 3100 Won't POST, getting amber flashing amber light at front panel and on the mother board getting steady light near the cmos battery note under the light says cr3h1 re-seated cpu and cards,...

I concur with your diagnoses.

Weak power supply due to a weak, or failed, voltage power rail.

There are three main voltage power rails for your Dell Dimension 3100 power supply.

1.The 3.3 Volt rail
2.The 5 Volt rail
3.The 12 Volt rail

Newer computer power supply's are doing away with the 3.3 Volt rail.
Your power supply has,

16 Amps on the 3.3 Volt rail,
21 Amps on the 5 Volt rail, and
21 Amps on the 12 Volt rail.

These are the main power voltage rails.
Voltage times Amperage = Wattage.
You have a power supply, that is rated at a maximum output of 400 Watts.

1) ALL the lights use less than 1 Watt.
2) EACH fan uses 2 to 3 Watts
3) A typical processor uses 55 to 125 Watts.

(A typical Intel Pentium 4 HT processor, Model 640, (3.2GHz), uses a maximum of 84 Watts,

With a weak, or failed voltage power rail you don't have enough power to turn on the processor.
No processor running there is nothing to run the operating system. (Windows XP is an example of an O/S)

The harddrive just sits there, and spins, or will spin a few times, and stop.

What causes this?
1) Cheap quality power supply, (SMPS), installed by computer manufacturer. Cheap components are used in the power supply. (Electrolytic Capacitors, gauge of wiring, rectifier bridge, and so on)

2) Inside of computer, and power supply hasn't been cleaned on a regular basis.
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The processor fan builds up with dust, dirt, hair, etc, and the cooling capacity drops tremendously. Eventually the processor turns off. (BIOS turns it off)
It's a Fail safe feature that is built-in, to keep the processor from burning up.

Before it get's to the stage of overheating, and turning off, it calls for more power from the power supply.
The power supply works overtime to keep up.

When the inside of a power supply, and it's cooling fan are clogged with the above mentioned gunk, the cooling capacity of the power supply also drops tremendously.

The heatsink's inside the power supply cannot get rid of the heat. The fins are clogged, and air cannot rush through them to disperse the heat.

When the blades of the fan, and it's center hub become clogged, the cooling capacity drops due to not enough air is passed.

Heat = Wasted Energy, and the power supply strains to keep up. Eventually components inside the power supply start to fail, or fail.
(Electrolytic Capacitors are usually the first to go. They are the weakest link)


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