Power supply help needed (noob)

Discussion in 'Power Electronics' started by cong, Mar 6, 2017.

  1. cong

    Thread Starter New Member

    Mar 6, 2017
    3
    0
    Hi all!
    Starting saying that I have very few notion of electronics (I work a lot with arduino and stuff but nothing more than that) so please be kind and patient. :D

    So, I need to build a power supply, I need various voltages out of that for many audio equipment and I need space, so I can't use all the original suppliers from the manufacturers.
    As I said I already have a small knowledge on circuit building, since now I always used low voltages on cheap equipment but now I don't have to power a 40€ Arduino anymore but 3k of extremely delicate sound equipment and I also I have to work with a lot higher voltages so I would like to not kill my equipment or myself (in that order).

    What I need:
    -Possibly a power supply that can work both on 110v and 230v.
    -A lot of power.
    -These voltages: (the ampere are a bit over the actual maximum need of the equipment)
    9v (4 socket, 2A tot)
    12v (2 socket, 2A tot)
    15v (4 Socket, 4A tot)
    -Protection on the outputs for over-current and short circuit.
    -Thermal protection on the power supply.
    -Extremely clean and stable power
    -Extremely low noise on the circuit and on the equipment.
    -Extremely isolation between all the equipment.

    What I would like:
    -A fan to cool down the case, but I a bit worried that can cause noise on the power, should I put some filter?)
    -A led for each output to show the presence of tension or a fault.
    -A switch for every output (not a really big deal)
    -Maybe a temporized turn on for the various voltages (Do I need it? when I turn it on I can achieve a stable power or that much load can lead to unstable voltages?)


    This is what I thinked:

    IEC Filter:
    http://it.rs-online.com/web/p/filtri-iec/1230274/

    (should I need a rectifier here? I should right?)

    Converter 110v/230v to 12v:
    http://it.rs-online.com/web/p/convertitori-cc-cc-isolati/8284486/

    Converter 12v to 24v: (I would need that only if I use Linear voltages regulator)
    http://it.rs-online.com/web/p/convertitori-cc-cc-isolati/8431673/

    Or use something like this:
    http://it.rs-online.com/web/p/alime...grati-smps/0446138/?origin=PSF_430700
    (but I'm a bit afraid of the noise from a switching supplier)

    Linear tension regulator: (here going from the 24v converter to 10 of these each regulated to he specific voltage)
    http://it.rs-online.com/web/p/regolatori-di-tensione-lineari/5335840/

    and here 10 different sockets for each power regulator.

    Can work?

    My questions:

    Why I should use a linear power regulator and why a step down?
    Es: http://it.rs-online.com/web/p/convertitori-cc-cc-isolati/1002643/
    with the step down I wouldn't need the 24v converter but are a lot more expensive.

    Thanks a lot in advance to everyone who will be so kind to help me!
     
  2. Dodgydave

    AAC Fanatic!

    Jun 22, 2012
    7,586
    1,250
    Sounds like you need a switchmode psu, giving out 15V@10amp, then use two Lm2596 pcbs to drop down to 12v and 9 v.
     
    cong likes this.
  3. cong

    Thread Starter New Member

    Mar 6, 2017
    3
    0
    The Lm2596 looks interesting! do you have experience with that? any noise suppression to recommend?
     
  4. cong

    Thread Starter New Member

    Mar 6, 2017
    3
    0
    Ok, Here what I found that can give me 10A at 15v:

    This looks like a luxurious power supply, lots of protections and the integrated EMI filter looks interesting:
    http://it.rs-online.com/web/p/alimentatori-switching-integrati-smps/4557910/

    Two pretty standard supply:
    http://it.rs-online.com/web/p/alimentatori-switching-integrati-smps/8159330/

    http://it.rs-online.com/web/p/alimentatori-switching-integrati-smps/6802824/

    Interesting, lots of protection here and an insulated 12v port for a fan which is extremely interesting, don't know the difference between those "open" or "closed" enclosures,
    http://it.rs-online.com/web/p/alimentatori-switching-integrati-smps/6688870/


    Still really afraid by the noise those power supply can output,

    Do I need a single Lm2596 for each voltage?
    This wouldn't will share noise on all the equipment connected?
     
  5. Dodgydave

    AAC Fanatic!

    Jun 22, 2012
    7,586
    1,250
    The €44 one is the best, yes you will need a Lm2596 for each of the 12 and 9 v, you can get them ready-made pcb on ebay.
     
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