Transformers and Power Traces

Discussion in 'Wireless & RF Design' started by brightnight1, May 23, 2018.

  1. brightnight1

    Thread Starter Member

    Jan 13, 2018
    40
    1
    I suspect some parts of my understanding about this system are wrong and was wondering if someone could help correct me where I am mistaken, I'm not sure which part of my understanding is wrong:

    If a transformer works by generating a magnetic field because of a changing current, how is it possible that a transformer can pickup parasitic power from a nearby high power DC power trace? Are transformers or inductors only problematic near PCB traces that have AC signals or can they be a problem when placed near high power DC traces? If a transformer or inductor can be a problem near a DC trace, how is that possible because the current isn't alternating?

    Not sure what or how much of this is true. Any advice appreciated, thanks in advance!
     
  2. crutschow

    Expert

    Mar 14, 2008
    20,227
    5,727
    Don't know where you heard that? o_O

    Normally a transformer is unaffected by any nearby trace carrying DC power.
     
  3. brightnight1

    Thread Starter Member

    Jan 13, 2018
    40
    1
    What about inductors?
     
  4. crutschow

    Expert

    Mar 14, 2008
    20,227
    5,727
    Same thing.
    A steady DC current has a steady magnetic field, which induces no voltage in adjacent wires.
     
Loading...