Designing A Power Supply

[73's de Edd]

Senor Javier . . . . . .

You say:
I got this power supply from an Epson printer.

Any chance that it is being a PCB inside of the unit, or is it being external of the printer.
And it being in the order of a "Wall Wart" but with it being a switch mode unit usually they are given a more dignified name, such as being a power "brick".
Of units I see, a 42VDC unit that is associated with an Epson Signature photo printer is putting out 42 VDC but is only 440 milliamperes of current.
Can you provide all significant numbering from that part that you have, so those numbers then might then be tied into an actual Epson model that it is being used in.



73's de Edd

 

[Javier]

what I could understand, 73's- is that can this Epson power supply deliver 0.5A only? if so, then I will not waste any time for it; 42vdc output voltage is supplied by the following circuit: chopper transformer - rectifier FCH05A10 - 1000uF 50V cap - 2A fuse : output. I will try to upload a photo; thank you

 

[Javier]

model is EPS-83v

 

[73's de Edd]

Sir Javier . . . . . . . . . . . . .

No luck on finding that EPS83V . . . as that researches out, with that number being a PROJECTOR.
In the photo below there are a string of printers at the left row, with only one having an "83" numerical reference, but with the two below, including an "83" in their model numbering scheme.

The mid / vertical row is one supply that is mounted inside of an Epson, in its own plastic case . . .and not being a separate external power " brick " .

The far right vertical row is also a like unit and it does confirm a 42V DC output.

BUT if you look at ALL of the printers supplies, they are all consuming low wattages.

A 42V supply at 1 amp would be at a 40 watt level . . . . . .of course at a reduced voltage use level for your power supply, that would drop on down to an ~ 30 W level of power consumption.

The only P.S. part number that you gave me that equates, was that 100VDC 5 amp Full Wave Bridge Rectifier which is quite hefty for one of these units. That, along with its 2 amp fuse.
Additionally, that 1000 ufd degree of filtering would be borderline low at that power level also.

Looks like the next step would be for you to cobble together an ~68 thru 75 ohm power load of ~30 watts and see just how much that power supply loads down with that load level being subjected to it.

Just monitor the 42 volts and load down the supply for just enough time to get a meter reading and the power resistors power rating could be downgraded.

EPSON INFO:






73's de Edd

 

[Javier]

Hi 73; thank you.. with the data I gave you respect to the components on the secondary power supply, is the piwer rated at 2 A??

 

[73's de Edd]

Having seen the meager power consumption of the other units, it seems that the loading down of the supply , with my mentioned substitute load value, needs to be done.
Then you read its loaded down output voltage.

73's de Edd


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