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Discussion in 'Electronic Design' started by vecihi, Oct 23, 2005.

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  1. vecihi

    vecihi Guest

    hi i am new in this forum.. but this is the best place to write m
    question i guess.. the problem is with the simulation of th
    circuit.. its a simple bridge rectifier circuit a simple adopte
    circuit actually which is supplied with 220V AC , 50Hz and out pu
    with 9V DC and 300 mA ... well when i wanted to simulate it.. i
    gives error such these thing

    * C:\Documents and Settings\reaven\Desktop\Pspice\
    Reading and checking circui
    Node $N_0002 is floatin
    Node $N_0003 is floatin
    Voltage source and/or inductor loop involving V_V
    Circuit has errors ... run aborte
    See output file for detail
    Simulation aborte

    thnx for your helps! good luc
    Istanbul Tec
  2. Jim Thompson

    Jim Thompson Guest

    On Sat, 22 Oct 2005 19:36:27 -0500,
    Post your schematic on alt.binaries.schematics.electronic

    Sounds like you have multiple problems.

    ...Jim Thompson
  3. What is connected to node 2?
    What is connected to node 3?

    If you leave one side of a capacitor unconnected, the program has no
    way of deciding the initial capacitor voltage, since any charge could
    be trapped in the capacitor.

    If you have only one side of many other components connected to
    defined voltages, some simulators complain that having an unconnected
    end produces a useless component that can carry no current.
    Perfect inductors can circulate infinite current when connected to
    perfect DC voltage sources. Before a time simulation runs, the
    initial condition must be calculated, where all currents and voltages
    are assumed to be the values reached by the time they settle to steady
    state. An inductor across a voltage source settles to infinite
    current. If your circuit has a DC voltage source connected across an
    inductor, it probably is not what you intend to simulate.

    What is voltage source V1 connected to?
  4. Jim Thompson

    Jim Thompson Guest

    Now. Now. Now. If they did that us old farts would be unemployed

    ...Jim Thompson
  5. Pooh Bear

    Pooh Bear Guest

    What are you trying to simulate specifically ?

    My mind boggles that ppl do this. Why not 'simulate' using a piece of
    paper ?

  6. I have a simulator which gives the same waveforms as spice, but with
    additional information and you can input the data in seconds. It handles
    transformer voltage drop under load for you. You have to measure
    transformer primary and secondary windings with an ohmmeter, then measure
    no-load secondary voltage. This tool predicts real world performance

    If you go to and download
    "Electro Tools" you will find the simulator as one of the simulator

    Roger Lascelles
  7. Terry Given

    Terry Given Guest

    besides, simulating a rectifier-capacitor supply using a bit of paper is
    a lot trickier than you might think. Barton wrote an entire (albeit
    tedious) book on the subject....and I recently saw a paper in IEEE
    trans. power electronics on the topic.

  8. Pooh Bear

    Pooh Bear Guest

    My mind also boggles that anyone would actually *want* to write at such
    length on this topic !

    In any event such matters as DC R, winding inductance and coupling are
    entirely under the control of the transformer vendor ( unless *you* know how
    to specify ) and no amount of simulating will change that.

    I defy anyone to better the pragmatic ' suck it and see ' version of
    ensuring it performs as required after doing the initial sums the good
    old-fashioned way and typically revisiting the transfomer design after the
    first iteration !!!

  9. Joel Kolstad

    Joel Kolstad Guest

    This sounds a look like "simulating" an AM receiver with a diode on paper...
    almost all the introductory material you see shows the diode clipping the
    negative half of some nicely modulated AM signal and feeding it into a
    capacitor/load resistor detector to smooth out the variations, thus making it
    "obvious" how AM diode detection works.

    ....if only you could buy one of those ideal diodes in the first place!
  10. Terry Given

    Terry Given Guest

    specs are just words. what really counts is how the actual devices
    operate. This, of course, is why Deming, Juran et al go (went) on at
    great length about building long-term relationships with capable,
    trustworthy vendors.
    why would a transformer design need multiple iterations?

    If you are building say a 2.5MW multipulse rectifier, it might not be
    advisable to "suck it and see", especially wrt harmonics.

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