VARIABLE VOLTAGE LAB POWER SUPPLY USING PSU

  1. Kiwi

    Kiwi

    Joined:
    Jan 28, 2013
    Messages:
    239
    Likes Received:
    56
    Location:
    Christchurch, New Zealand
    Kiwi submitted a new Showcase Item:

    VARIABLE VOLTAGE LAB POWER SUPPLY USING PSU

    Read more about this showcase item here...
     
    Kiwi, Nov 30, 2014
    #1
    1. Advertisements

  2. Kiwi

    rich-38

    Joined:
    Mar 29, 2015
    Messages:
    2
    Likes Received:
    0
    You use this for your startmotor, ive seen a lot, since my father had a lease/repair company, but smps can'tstand the powerdraw. Just google and you'll see that they just use supercaps, which can withstand the currentdraw .... You need a big buffer
    which can deliver that current. Psu's from computer suck, that's chinese rubbish and certainly not made to the purpose you want it for. 20A for a longer time Isn't a problem for thyristors or fets, not constantly, your pcu has also 10 powerfets switching fast, just like a grapic card, but whatever you use supercaps are the safest. Watch an poweramp class d. and the row fets and capacitors to deliver the powerdraw
     
    rich-38, Mar 29, 2015
    #2
    1. Advertisements

  3. Kiwi

    davenn Moderator

    Joined:
    Sep 5, 2009
    Messages:
    11,475
    Likes Received:
    1,281
    Location:
    Sydney, Australia
    I don't think he is really worried about the starter motor, rich-38

    for starter motor turning on the avg 12V powered car, you require a minimum of 600 -700 amps
    peak current draws often hit 1000 amps for brief moments

    Dave
     
    davenn, Mar 29, 2015
    #3
  4. Kiwi

    Kiwi

    Joined:
    Jan 28, 2013
    Messages:
    239
    Likes Received:
    56
    Location:
    Christchurch, New Zealand
    What I was referring to when I mentioned "cranking" was the effect that the low voltage during engine starting would have on the equipment I was working on.

    Electronic circuits designed for automotive applications need to have a fairly wide voltage supply range.
    The vehicle may have a nominal voltage of 12volts, but the circuit must be able to operate between about 9 - 15volts without failing.
    You would get pretty annoyed if your car stereo lost all its radio station pre-sets every time the engine was started, just because the voltage dropped to 10volts.
     
    Kiwi, Apr 11, 2015
    #4
  5. Kiwi

    Maddhung73

    Joined:
    Sep 5, 2015
    Messages:
    4
    Likes Received:
    1
    Location:
    Neillsville, Wi
    Cool project man, keep that imagination a CRANKIN!!! (no pun intended)
     
    Maddhung73, Sep 5, 2015
    #5
  6. Kiwi

    peterlonz

    Joined:
    Feb 11, 2010
    Messages:
    21
    Likes Received:
    1
    To be honest I can't see how you intend using your DIY device.
    This does not help anyone wishing to suggest improvements.
    One thing I'd suggest is you allow for case ventilation if you intend operation for more than 10 mins or so at a time.
     
    peterlonz, Jan 4, 2017
    #6
    1. Advertisements

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Similar Threads
  1. none none
    Replies:
    6
    Views:
    2,216
  2. Jake Omega

    high current variable power supply from ATX PC supply?

    Jake Omega, Oct 10, 2009, in forum: Electronic Design
    Replies:
    1
    Views:
    1,712
    Jake Omega
    Oct 10, 2009
  3. power_supply

    PC power supply as lab power, voltage issue

    power_supply, Nov 12, 2011, in forum: General Electronics Chat
    Replies:
    10
    Views:
    1,183
    davelectronic
    Nov 15, 2011
  4. bengaltiger

    DC-DC variable voltage and current lab power supply

    bengaltiger, Aug 8, 2012, in forum: General Electronics Chat
    Replies:
    12
    Views:
    1,642
    (*steve*)
    Aug 10, 2012
  5. Kerazyugy

    using wal wart to make variable voltage power supply

    Kerazyugy, Nov 13, 2013, in forum: Electronic Projects
    Replies:
    5
    Views:
    659
    eKretz
    Nov 18, 2013
  6. AlenZGB

    ATX power supply to bench lab supply? help

    AlenZGB, May 31, 2014, in forum: Electronic Projects
    Replies:
    14
    Views:
    4,926
    AlenZGB
    Jun 3, 2014
  7. Omega Supreme

    RadioShack Electronics Learning Lab and Sensors Lab

    Omega Supreme, Oct 9, 2014, in forum: Electronic Projects
    Replies:
    32
    Views:
    2,668
    davenn
    Oct 13, 2014
  8. Electrowan

    variable power supply from a computer psu

    Electrowan, Apr 11, 2016, in forum: Electronic Projects
    Replies:
    1
    Views:
    221
Loading...