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Designing a PSU with three different outputs.

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Sombiefog:
Hi! First time posting here :)

So im doing my electrical engingeering degree and wanted to have a side project during my last year.
Ive been wanting to combine two PSU units i already have into a singular one.
One is a PC PSU the other is a PSU for a laser unit.

I have experience in PCB production, drawing and schematics. But i cant get a good wrap around power electronics.

So i want to design circuitry wich takes AC 230V mains and turns it into three DC outputs. 
Output 1: 19.5V, ~9A
Output 2: 12V, 8A
Output 3: 4.5V, 15A

The power has to travel accross a 20m powercable and is connected to the main network.

Does anyone have any tips to get me started?
Any pointers? (Buck, flyback? / wich chips? / How do i get the right transformers?)

Ive been searching many different websites and programs but all seem to be obsolete.

soldar:
You want to design and build one single unit to give you those outputs? That is a tall order. It can be compared to a computer PSU and you could probably modify one to do what you need  but if you just want to cover a need then I would buy something commercially available.

Sombiefog:
It is indeed a tall order.

Im just wondering if somone had tips / pointers for where to start.
The software which makes examplecircuitry for you is all outdated.

I know there are commercial products out there which i can use.
But i know this forum has the potential to help me! :D

Ive attached an image of the PSU for the laser. This gives two of the outputs (O2, O3)

Thanks :D

DannyTheGhost:
If you want to design your own PSU, you should decide several things: topology, estimated efficiency (active or passive cooling etc.), even which outputs will be regulated and which are not.
For almost 400W PSU flyback would be too big
When working with mains voltages you also will need isolated output
But, if you think you have not that specific requirements for PSU, better to think about getting multiple commercial PSU for each voltage, because time is money, and PSUs not that easy to design and make

larsdenmark:
You'll need a cable with some thick leads in order to send 15 A through it 20 metres away. If your leads are too thin the cable will melt.

And yes, making your own PSU seems difficult at best and you may start a fire in the process if you are doing it wrong.

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