PCB layout considerations for non-isolated switching power supplies

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  • sam_sam_sam
    Modification to a ZD-987 desoldering/soldering station using a external switching power supply
    by sam_sam_sam
    I have been working on this concept for quite some time now with limited success but recently I found a switching power supply that is setup for the voltage that this soldering station needs to operate at however it also needs part of the secondary circuit from the original switching power because you need several voltage rails

    I once tried to get a ZD-915 desoldering station to work on a 18 volt battery power supply but unfortunately things did not go well but I did find a work around but I might try this idea again but going at a little differently more about this another time...
    07-01-2024, 06:34 AM
  • sam_sam_sam
    Desoldering gun station modified to use a 18 volt @ 20 amp switching power supply
    by sam_sam_sam
    I have wanting to do this project for quite sometime now and I finally found a switching power supply that will work on this desoldering gun station ZD-915 that the original switching power supply took a shit and just was not worth trying to fix it because this switching power is not quite big enough to handle the heater element and the vacuum pump

    One note when I tested the switching power supply and the voltage control board I noticed that this desoldering gun heat up much faster than the original switching power supply which I was really surprised by to the point that I might buy...
    03-31-2024, 02:12 PM
  • sam_sam_sam
    Meanwell Switching power supplies intermittent every capacitor under 100uf
    by sam_sam_sam
    Here is the eBay website link where I bought them from

    https://www.ebay.com/itm/276135936202

    I have been waiting for these switching power supplies to come well they came in today so I took one apart and found that it Capcon and EIite and another brand that is on my list of capacitors to replace on site it has several 0.47uf @ 50 volts ESR value twice the reading of a new one 10 UF @ 50 volts almost twice the ESR value of a new one 47 UF @ 59 volts with double the ESR value 100 UF almost the same as a new one it got replaced for good measure Iit was a brand if I see them...
    11-25-2023, 06:05 PM
  • Per Hansson
    WARNING: Live heatsinks & single pole on/off switches in switching power supplies
    by Per Hansson
    This is a warning to inexperienced and experienced techs alike:
    The De-facto standard is to have the primary side heatsink live in switching power supplies.
    That is the primary side heatsink is referenced to the negative of the bulk filtering capacitor.
    Therefore never ever touch the heatsink if the device is plugged in.
    And even if it is unplugged let the capacitor discharge first!

    Another really serious concern is that the power switch also by De-facto standard is single pole.
    This means it only cuts power to the phase or neutral (not both) depending...
    06-09-2021, 12:01 PM
  • Per Hansson
    WARNING: Live heatsinks & single pole on/off switches in switching power supplies
    by Per Hansson
    This is a warning to inexperienced and experienced techs alike:
    The De-facto standard is to have the primary side heatsink live in switching power supplies.
    That is the primary side heatsink is referenced to the negative of the bulk filtering capacitor.
    Therefore never ever touch the heatsink if the device is plugged in.
    And even if it is unplugged let the capacitor discharge first!

    Another really serious concern is that the power switch also by De-facto standard is single pole.
    This means it only cuts power to the phase or neutral (not both) depending...
    06-09-2021, 12:01 PM
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