Isolation Transformer

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  • harp
    isolation transformer from two 240/12, wiring?
    by harp
    When is talk about making isolation transformer on poor-man way, always I see schematic 240/12-12/240.
    So, I wonder, is this wiring from my attachment it work, bringing some good feature or it is bad idea and why?...
    11-25-2022, 05:11 PM
  • Briesmith
    Can High Side damage on an SMPS get across the Transformer to the Low Side?
    by Briesmith
    I have a blown smps and I am looking for some reassurance as to the amount of diagnosis I have to do. It blew the instant I plugged it in not under any load.

    As you can see from the attached pix, the damage is located around the main or bulk capacitor (since removed for testing) and the resistor array/network that drives it (the bunch of SMD components to the left of the YAMAHA YC775 AMPS logo). The burn mark on the frame clearly shows the pins of the capacitor. And, for the avoidance of doubt, there is no way the board could have contacted the frame, it was correctly mounted on...
    05-06-2023, 09:36 AM
  • mikey5791
    Is it possible for transformer substitution?
    by mikey5791
    Hi all,
    Got this local made DC power supply (12/14V) given free as the transformer has melted. There is no marking or indication to identify what type or rating of transformer used.
    Fyi,. I had a busted autogate mainboard with transformer with marking 13-0-13 . Is this the 13v dc type transformer?
    My questions are
    1. How do i test to see if the transformer is in good working condition?
    2. Can this transformer (marking 13-0-13) be used to replace the melted transformer on the DC power supply?
    Hope you guys understand what i was asking. My intention is...
    11-03-2022, 02:11 AM
  • PlayerOne
    Velodyne SMPS, power transformer
    by PlayerOne
    I need help in finding a schematic or otherwise identifying the electrical characteristics of a transformer in a SMPS having the following marking:

    042-010214-000ZR
    ELY 1317

    A photo of the transformer is attached. In particular, this is a PCB mounted transformer and I need the pinout.

    I've tried Google searches of various portions of the part number with no luck, however managed to find posts with photos of this transformer having the same markings, except for the numbers following the “ELY” which leads me to believe they must be date code...
    03-31-2020, 12:37 PM
  • dennis_elx33
    3PHASE STEP-DOWN Transformer in Check
    by dennis_elx33
    Hello All,

    i would like to post an interesting topic regarding 3-phase stepdown transformer which we suspect to cause an overcurrent (138A) which resulted to power tripped off of the HV power supply (80KV output).


    Problem statement: Power tripped Off

    Initial Problem: Found 2 IGBT and 2 rectifier diodes shorted (burnt).

    Action Done:
    1) Replaced the faulty parts with good spare.
    2) Measured impedance of the 3phase input lines and found that L2 to L3 has 23.3ohm while other pairs are 51Kohm. This pins will...
    12-02-2024, 06:52 AM
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