On Monday 01 March 2010, Rubén Gómez Antolí wrote: > Sorry about repeat topic, but I'd fall in a nightmare with > this circuit and his evolution. > > If is possible that there are a fail in design because I > haven't correct output of buck chopper (1.5 V instead 1V, > Ngspice runs circuit :-/ ), but I can't found the "bug". > > I note that in Ngspice output there are too much "noise", > that I think is no normal. >
I can't run it .. there are pieces missing. Spice time step control and convergence checking is often not strict enough. Sometimes it accepts results that are wrong. Here are a few ideas ... Breakdown doesn't work with the native diode model. Try the one in models-spice3f5 instead and see if that helps. Try "option noincmode nobypass". Try setting gmin larger. Try adding a resistor across the diodes. Try adding a switch, with the control port across a pair of nodes that you think are causing trouble. Leave the output (switched resistor) unconnected. Try "option method=euler" or "option method=gear" _______________________________________________ Help-gnucap mailing list [email protected] http://lists.gnu.org/mailman/listinfo/help-gnucap
