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Dynamic Load?

Discussion in 'Electronic Design' started by Myauk, Oct 19, 2006.

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  1. Myauk

    Myauk Guest

    I studied the schematic diagrams of some SMPS designs.

    There I found circuits called 'Dynamic load'.

    What does it mean by that??

    Regards
     
  2. Boris Mohar

    Boris Mohar Guest


    Abut 35 years ago I was a very junior tech wire wrapping "logic boards" for
    a hug security console that contained a drum printer, clock and annauciator
    panel consisting of hundreds of lights denouncing what the various portals in
    plant were open or closed. There was more to it but I don' remember. The
    project went smoothly and was delivered on time and within the budget. We
    invited the chief of security to the command post and briefed him on various
    operations. In the midst of getting familiar with various functions he asked
    "And what is this button marked LT do?" "Oh that is the Lamp Test button. It
    turns on all of the annauciator lamps on at once so that you can easily spot
    if any are burned out. Go ahead, try it I urged him wit confidence." So he
    pushes the button and there is a groan from underneath the console as the SCR
    regulated power supply struggles to keep up with the load. Every light (
    there were hundreds of them) light up and he satisfyingly lets go of the
    button. There was tick sound followed by snap crackle and pop as every
    circuit board self destructed. Lots of smoke too. Although we tested the
    lamp test function we did not test it under the full load. Back in the lab
    we discovered that when the full load of 20 or so amps was suddenly reduced
    to 1Amp, the 5 volt "regulated" output shot up to 20 volts. That is when I
    learned the importance of verifying the dynamic load.



    Regards,

    Boris Mohar

    Got Knock? - see:
    Viatrack Printed Circuit Designs (among other things) http://www.viatrack.ca

    void _-void-_ in the obvious place
     
  3. Myauk

    Myauk Guest

    Now I understand the term, Dynamic Load.

    But what does it mean by dynamic load circuits in SMPS designs??

    Regards
     
  4. What happens to the power supply if you cycle the load from maximum to
    minimum every 5 seconds for 5 minutes, say?
     
  5. Myauk

    Myauk Guest

    Do you mean that it is the circuit designed to compensate the dynamic
    variation of the output load?

    Regards
     
  6. It is a test you need to perform.
     
  7. Myauk

    Myauk Guest

    Ok

    I would better chek it out in the designs I am studying.

    Thanks for the hints.
     
  8. Boris Mohar

    Boris Mohar Guest

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