LTspice and RLC simulation

Discussion in 'General Electronics Chat' started by mahela007, Sep 12, 2011.

  1. mahela007

    Thread Starter Active Member

    Jul 25, 2008
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    0
    Hi.. I'm having trouble simulating an RLC circuit in LTspice.
    According to other JAVA applets on the internet, the current must first increase form a 0 value to a peak value and then drop of, following a wave like pattern. In LTSpice, the current starts at a high value and gradually decays (and then follows the wave pattern).

    I'm trying to simulate a charged capacitor discharging though an inductor. To do this, is used the .ic dirrective to specify that the capacitor is charged at the beginning of the simulation.

    (the circuit is a basic RLC series circuit)
     
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    You should attach your simulation .asc file for those who have LTSpice installed, and an image of your circuit (.PNG preferred) for those who don't.

    Including images and source files leaves nothing to the imagination of those who may wish to help you.
     
  3. mahela007

    Thread Starter Active Member

    Jul 25, 2008
    45
    0
    The circuit, as I said, consists simply of a capacitor, a resistor and an inductor connected in series.

    Anyway, I think I found the solution. The "skip initial operating point" option must be selected in the simulation commands window.
     
  4. CraigHB

    Member

    Aug 12, 2011
    127
    15
    Yes, LTSpice will assume initial DC operating points as do most simulators. You can either skip the initial operation point solution or set up your input signals so they are zero initially. I usually just set up my inputs as required.
     
  5. mahela007

    Thread Starter Active Member

    Jul 25, 2008
    45
    0
    Sorry.. I dont understand what you mean by that
     
  6. CraigHB

    Member

    Aug 12, 2011
    127
    15
    I'm only trying to say you can set your input voltages so they start out at zero. See attachment.
     
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