[Help-gnucap] Several problems: convergence failure, segment fault, params error

[Rubén Gómez Antolí]

Hello all:

I'm getting several problems with a chopper circuit.

Here are the circuit:

gnucap> list
* Fuente de entrada
Vi ( 1 0 )  DC  5.
R1 ( 1 2 )  1.
C1 ( 0 2 )  0.0022
* Interruptor
S1 ( 2 3 4 0 )  IntT
* Diodo
D1 ( 0 3 )  UF4004 NA( 1.)
* Filtro
L1 ( 3 5 )  0.001
C2 ( 5 0 )  47.u
* Carga
RC ( 5 0 )  10.
* Control de conmutación
VG ( 4 0 ) pulse iv= 0. pv= 35. delay= 35.u rise= 1.p fall= 1.p width= 
15.u period= 50.u
RG ( 4 0 )  0.01
* Modelos
.model IntT sw ( vt= 1. vh=NA( 0.) von=NA( 0.) voff=NA( 0.) ron= 0.01 
roff= 10.Meg tnom=NA( NA))
.model UF4004 d ( tnom=NA( 27.) is= 650.p rs=NA( 0.) n= 2. tt= 50.n cjo= 
31.61p pb= 0.85 mj= 0.33 egap= 1.11 xti=NA( 3.) fc=NA( 0.5) bv= 400. 
ibv= 10.)

1· Problems with params:

gnucap> param periodo=50us
gnucap> param llano=0.7*periodo
param llano=0.7*periodo
               ^ ? syntax error

According to wiki page (0) are correct, but fails.

2· Convergence failure:

gnucap> print tran v(*) i(l1)
gnucap> tran 0 5ms 1u > S01.dat
non-recoverable convergence failure, reducing (itl4)
newtime=8.500000e-05  rejectedtime=8.500001e-05  oldtime=8.500000e-05 
using=8.500000e-05
tried everything, still doesn't work, giving up

I'm tried setting itl4 bigger and smaller without sucess.

3· Segment fault

I tried to change diode with alter command; when I run tran command, 
gnucap dies with a segment fault:

gnucap> alter D1 (0 3) D
gnucap> tran 0 5ms 1u > S01.dat
Violación de segmento

or

gnucap> alter D1 (0 3) D
gnucap> print tran v(*) i(l1)
Violación de segmento

Will help a strace output of this?

Thanks in advance.

Salud y Revolución.

Lobo.

(0) 
http://www.gnucap.org/dokuwiki/doku.php?id=gnucap:manual:howto:expressions
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