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I have a dell dps-1200EB 12 volt smps. I am trying to increase the voltage to about 14 volts. I cant seem to locate the regulator or the reference to it, usually a resistor you can change value to change available voltage. I have 3 hours of inspection of the insides so I am pretty well aclimated to the supply. Any help would be great, a schematic would be incredible. Thank you

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  • colinsouney Mar 12, 2011

    dps-1200eb is the part number. switched mode power supply.capable of 12 volts at 100 amps of available current. It does work as a stand alone unit, so I should be able to increase the voltage, if even only a volt maybe more. I understand there will be a loss of available current.

  • colinsouney Mar 12, 2011

    DPS-1200EB 12v 100 amp switched mode redundant power supply. Where can I get the schematic?

  • colinsouney Mar 13, 2011

    Thank you for the honest and direct answer. Is there a practical way to lower the voltage? I have a somewhat unlimited supply of these and can run them in series. 12 volts at any current is not as important to me as no more than 18 volts at limited current. 14 volts nominal would be spectacular. Again I can get these for just about scrap value, so the education of the modification would go huge bounds for my shack, thanks.

  • colinsouney Mar 13, 2011

    I am not concerned with the wattage, while Im sure it will still be reasonable at a higher voltage. I do not have a hipot tester. I have an unlimited supply of these and if I can figure out how to manipulate the voltage, I can use them in my shack.

  • colinsouney Mar 13, 2011

    Even 13.8 would be acceptable. The issue is that I have a variety of ham transceivers, the output transistors in them do not really come to life untill 14 volts. The difference between 12 and 14 volts is amazingly different. I cant get more than 30 watts out of my daily rig untill there is emission issues. At 14 volts I get over 50 watts before I run into issues. These of course are RMS readings. Currently I have 4 variable linear 50 amp astron supplies running in parrallel and set at 15 volts. Thats a lot of realestate compared to these nice little switchers. Thank you for all your help.

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The regulation circuit comprises of a 3 pin voltage regulator . Look for an IC with number that looks xsomething like LS 7xxx. Get me the number and I will verify if you got it!

Posted on Mar 13, 2011

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In case you are trying to increase the voltage without changing the wattage. You shall let me know that do you have any potmeter in there. Further, I kindly need to know that what type of transformer that unit is having.

Posted on Mar 13, 2011

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Hi, you cannot simply alter the 12V Voltage, it is NOT as simple as changing a resistor.
The entire SMPSU design is around 12 V & 5V & 3V, it isn't realistically possible to alter the 12V to 14v under any circumstances, sorry.
You would be best to simply construct, obtain a power supply that provides 14V and "Piggy Back" it onto the existing supplies 230V input.


www.smpstech.com/
Have a look at the website above it show one how to design SMPSU's

Posted on Mar 12, 2011

  • electronic & computer repair&  servicre

    hi, I forgot to add also, you see the secondary windings of the main, Flyback/Buck/Boost transformer, are limited to a MAXIMUM of 13.8V AC & 7.2V AC, to get any more voltage out of the Transformers, and these ARE the limiting factor, you would need to overwind it, IE: Add extra turns to the transformer, to produce an increase of the Voltage output, and this isn't really possible.

  • electronic & computer repair&  servicre

    Hi again, I see the desirability of wanting to use a supplies like you have got. you MAY be able to up the Voltage to about 13.8 V, to do this you would have to somehow adjust the feedback circuit, and lessen the Voltage going back to the regulator IC, this in turn, MAY cause the regulator to drive the switching transistors harder, and MAY increase the output? You need to get a spec sheet on the IC's used to control the SMPS.

    Also perhaps whatever you need to operate WILL actually work, @ 12V? as, usually a thing works on a VA rating or Watts, a function of Voltage and Current, now if you have 100Amps or so, then the Voltage may be able to drop somewhat yet STILL have the, Current, the OOmph to drive the device, it may just be worth a try, it definitely cannot hurt.

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One common design for transformer-isolated smps uses a three-terminal voltage reference on the secondary side to drive the opto-coupler LED for the main regulator. This controls the 5-volt supply, and the 12 volt output is set by from this by the turns ratio of the transformer (i.e, 12/5 of 5 volts). If you find the voltage reference, you can download the data sheet and figure out how the ratio between the 5 volt output level and the voltage reference controls the feedback LED current. Once you have this, change a resistor to get 5.8 volts and your 12 Volt supply should go up to 14 volts. Other designs use a Zener diode and an op amp. In any case, the reference is most likely in the 5 Volt feedback opto-coupler drive circuit. There is also a reference in the primary side switching regulator driver, but this is designed to measure the current through the opto-coupler output transistor and modification here would be more difficult to carry out successfully.

Note: there are probably over-voltage protection circuits that will shut down the supply if it goes outside the limits for its usual application (5.5 V, 13 V). Generally these use zener diodes as independent references; you can change the zener diode (or, if the zener voltage goes through a voltage divider to the shutdown circuit, change a resistor in the divider) to raise the over-voltage limit.

There are SMPS automobile battery substitute units on the market made for powering car stereos on the workbench. They put out 13.6 Volts and may be easier to use for your application. However, one of these takes more cash and is probably less fun that what you're doing.

Posted on Mar 12, 2011

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Hi


Increasing voltage is not only a bios level function, Its the bios and the chipset.You can increase Voltage by software. The bios is programmed for the chip therefore the voltage levels will be in that program and chipset also dependant on the bios.

It is suggested to contact dell customer care to get a proper guidance.


Please get back to us if you have further query else please accept the suggestion.

Thank you for contacting fixya.com


Posted on Mar 12, 2011

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