I have been trying to understand your models of PWM controllers. Add it as a directive to the schematic and the analysis will converge. LTspice will automatically convert such sources into their Norton equivalent save you having to do the calculation manually. Be suspicious of circuits that need something like the alternate solver or cshunt. I've seen it before with zeners. The dreaded time step to small error. Latest threads.
I try to simulate an impact a droplet on solid surface. when it solve the "time step is too small" error is appeared.
in solver output window in the last increment this. banghead::banghead: I'm trying to model a simple PWM and get this error.
I've seen it before with zeners. The thing that is interesting is that. Adding a small CSHUNT to each node can solve some "internal timestep too small" problems caused by high-frequency oscillations or.
Stol, MinDeltaGmin The source stepping algorithm makes uses the foreknowledge that a realistic simulation always will have a known starting solution when all its sources are set to zero i.
Whenever the simulator reduces the time step, it is because of nonlinear circuit behavior. Jump to: navigationsearch.
If you are having dc solution problems, first examine your simulation circuit for behavioral sources or other devices that may go highly nonlinear as the sources are stepped up from zero. In order to get good transient convergence, a good model should, as much as possible, contain elements with only voltage inputs and only current outputs Norton equivalents should be used to produce voltage sources.
Problems come when starting at zero doesn't yield a zero output.
Time step too small in pseudo transformational
I ran you simulation and got the "step size too small" error once, but then I couldn't get it to repeat. Then, as this unity node is reduced to near zero, anything multiplied by it is also forced to approach zero.
If you are having dc solution problems, first examine your simulation circuit for behavioral sources or other devices that may go highly nonlinear as the sources are stepped up from zero.
At really small time steps, only the capacitances will matter and, since capacitances are linear, the circuit will converge and the simulator will be able to get past the nonlinear behavior. I've seen it before with zeners. In theory each successful step along the way allows linearly extrapolating an almost perfect set of initial conditions for solving the succeeding nearby step.
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It is best to make a real circuit capacitance perhaps a circuit parasitic perform this duty, but, since the solver will go down to picoseconds, it is almost always possible to choose a capacitor that has absolutely no effect within the normal bandwidth of the circuit, yet still functions very well as a transient convergence aid.
Navigation Main page Recent changes Random page Help. Ran for me using ver 4. You must log in or register to reply here. Splitting a very nonlinear element into several pieces across several nodes can sometimes dilute the problematic behavior to the point where the solver no longer gets hung up on one very bad element. I fell better all over.
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|I always use either "a voltage source in series of a 1G Ohm" LTspice will automatically convert such sources into their Norton equivalent save you having to do the calculation manually.
Can you please let me know why a capacitor is needed, and how you determine the capacitor value? Adding a small CSHUNT to each node can solve some "internal timestep too small" problems caused by high-frequency oscillations or numerical noise. The only effect on such an expression occurs during source stepping while seeking the dc operating point.