I'm having problems simulating the following circuit using ngspice alongside Qucs.
The main problem I can see in log is that is acusing an singular matrix.
I imagine the problem is related to how the transformer is placed, but could not find anything related.
The ngspice code generated is:
* Qucs 0.0.19 /home/eduardo/projetoSimoes/qucs/initialCircuit.sch
.SUBCKT Bridges_GBU4G gnd _net0 _net1 _net2 _net3
DD1 _net1 _net0 DMOD_D1
.MODEL DMOD_D1 D(Is=2.46092e-06 N=2.62593 Rs=0.00370811 Cj0=2.8562e-10 Vj=0.25 M=0.332534 Fc=0.5 Tt=2.88539e-06 Bv=440 Ibv=0.05 Af=1 Kf=0)
DD2 _net1 _net2 DMOD_D2
.MODEL DMOD_D2 D(Is=2.46092e-06 N=2.62593 Rs=0.00370811 Cj0=2.8562e-10 Vj=0.25 M=0.332534 Fc=0.5 Tt=2.88539e-06 Bv=440 Ibv=0.05 Af=1 Kf=0)
DD3 _net2 _net3 DMOD_D3
.MODEL DMOD_D3 D(Is=2.46092e-06 N=2.62593 Rs=0.00370811 Cj0=2.8562e-10 Vj=0.25 M=0.332534 Fc=0.5 Tt=2.88539e-06 Bv=440 Ibv=0.05 Af=1 Kf=0)
DD4 _net0 _net3 DMOD_D4
.MODEL DMOD_D4 D(Is=2.46092e-06 N=2.62593 Rs=0.00370811 Cj0=2.8562e-10 Vj=0.25 M=0.332534 Fc=0.5 Tt=2.88539e-06 Bv=440 Ibv=0.05 Af=1 Kf=0)
.ENDS
XD1 0 _net0 _net1 _net2 Vout Bridges_GBU4G
V1 Vin 0 DC 0 SIN(0 127 60 0 0) AC 127
R1 _net1 Vout 36
C1 _net1 Vout 1U
L2 0 Vin 1
L1 _net2 _net0 1
K1 L1 L2 0.1
.control
echo "" > spice4qucs.cir.noise
echo "" > spice4qucs.cir.pz
tran 0.0001 0.1 0
write initialCircuit_tran.txt v(Vin) v(Vout)
destroy all
reset
exit
.endc
.END
The logs are:
Ngspice started...
Warning: singular matrix: check nodes l2#branch and l2#branch
Note: Starting dynamic gmin stepping
Trying gmin = 1.0000E-03 Note: One successful gmin step
Trying gmin = 1.0000E-04 Note: One successful gmin step
Trying gmin = 1.0000E-05 Note: One successful gmin step
Trying gmin = 1.0000E-06 Note: One successful gmin step
Trying gmin = 1.0000E-07 Note: One successful gmin step
Trying gmin = 1.0000E-08 Note: One successful gmin step
Trying gmin = 1.0000E-09 Note: One successful gmin step
Trying gmin = 1.0000E-10 Note: One successful gmin step
Trying gmin = 1.0000E-11 Note: One successful gmin step
Trying gmin = 1.0000E-12 Note: One successful gmin step
Trying gmin = 1.0000E-12 Note: One successful gmin step
Warning: singular matrix: check nodes l2#branch and l2#branch
Warning: Dynamic gmin stepping failed
Note: Starting source stepping
Supplies reduced to 0.0000% Warning: singular matrix: check nodes l2#branch and l2#branch
Trying gmin = 1.0000E-02 Note: One successful gmin step
Trying gmin = 1.0000E-03 Note: One successful gmin step
Trying gmin = 1.0000E-04 Note: One successful gmin step
Trying gmin = 1.0000E-05 Note: One successful gmin step
Trying gmin = 1.0000E-06 Note: One successful gmin step
Trying gmin = 1.0000E-07 Note: One successful gmin step
Trying gmin = 1.0000E-08 Note: One successful gmin step
Trying gmin = 1.0000E-09 Note: One successful gmin step
Trying gmin = 1.0000E-10 Note: One successful gmin step
Trying gmin = 1.0000E-11 Note: One successful gmin step
Trying gmin = 1.0000E-12 Note: One successful gmin step
Note: One successful source step
Supplies reduced to 0.1000% Warning: singular matrix: check nodes l2#branch and l2#branch
Supplies reduced to 0.0000% Warning: singular matrix: check nodes l2#branch and l2#branch
Warning: source stepping failed
Circuit: * qucs 0.0.19 /home/eduardo/projetosimoes/qucs/initialcircuit.sch
Doing analysis at TEMP = 27.000000 and TNOM = 27.000000
Transient solution failed -
Last Node Voltages
------------------
Node Last Voltage Previous Iter
---- ------------ -------------
_net0 1.74481e-22 6.32215e-27
_net1 1.74481e-22 6.32215e-27
vout -9.83511e-33 -1.26443e-26
vin 0 0
l1#branch 8.92061e-35 0
l2#branch 0 0
v1#branch 0 0
doAnalyses: iteration limit reached
tran simulation(s) aborted
Error(parse.c--checkvalid): vin: no such vector.
ngspice-26 done
The schematic is:
