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updates to optran description and example.

This commit is contained in:
Holger Vogt 2020-05-25 16:28:25 +02:00
parent 7de526237e
commit 89f78bfc6c
3 changed files with 23 additions and 8 deletions
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14
README.optran
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@ -12,10 +12,10 @@ If this fails:
If this again fails, bail out.
In tghis branch a fourth method is added:
In this branch a fourth method is added:
4) Start a transient simulation for a specific amount of time.
Keep all data local. Keep the matrix values as an
operating point for the simualtion following.
operating point for the simulation following.
If this fails, finally stop.
The time for transient is determined a priori. If a transient
@ -34,3 +34,13 @@ option gminsteps=0
Step 3 may be skipped by
option srcsteps=0
The transient op calculation uses the 'UIC' flag for its startup.
Basically two applications come to mind: You may use this with
constant voltage and current sources and simulate until the
output is stable. A method to automatically stop the op transient
simulation when all nodes have become stable, might be desirable,
but has not yet been implemented.
One also may use the optran for a first transient simulation, maybe
with different step sizes, before the next (tran, ac, pz, noise)
simulation is commencing.

2
examples/optran/F5TurboV2thermal-optran.cir
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@ -37,7 +37,7 @@ D2b1 Net-_D2a1-Pad2_ -32 DMOD
XP3 Net-_P3-Pad1_ 0 Net-_P3-Pad1_ RPOT value=200 ratio=0.85
XP1 Net-_P1-Pad1_ +32 +32 RPOT value=5k ratio=0.18
XP2 Net-_P2-Pad1_ -32 -32 RPOT value=5k ratio=0.18
V3 in 0 sin(0 2 1k)
V3 in 0 dc 0 ac 1 sin(0 2 1k)
JQ1 Net-_P1-Pad1_ Net-_Q1-Pad2_ Net-_P3-Pad1_ 2SK170
JQ2 Net-_P2-Pad1_ Net-_Q1-Pad2_ Net-_P3-Pad1_ 2SJ74
MQ5 out Net-_Q5-Pad2_ Net-_D1a1-Pad2_ Q5tj Q5tc IRFP240 thermal

15
examples/optran/script-optran.txt
View File

@ -8,8 +8,10 @@ if $?sharedmode
version
rusage
else
* script for standard ngspice
*option noinit
*** script for standard ngspice
* Start optran without first iteration,
* without gmin stepping and without src stepping
* optran duration 4s, step size 10 ms
optran 1 0 0 4 1e-2 0
tran 1u 10m
echo
@ -26,15 +28,18 @@ set xbrushwidth=1
* input and output voltages
plot in out
* power supply currents
plot V1#branch V2#branch ylimit -50 50
plot V1#branch V2#branch ylimit -10 10
*plot V1#branch V2#branch ylimit -50 50
plot V1#branch V2#branch ylimit -15 15
* output current
plot @rl1[i]
plot @rl1[i] xlimit 0 5m ylimit -0.3 0.3
*plot @rl1[i] xlimit 0 5m ylimit -0.3 0.3
* resistance of thermistor2 TH1, TH2
let rth1 = (v("net-_d3a1-pad1_") - v("net-_r11-pad1_")) / (@b.xth1.brtherm[i] + 1n)
let rth2 = (v("net-_d1a1-pad2_") - v("net-_r12-pad1_")) / (@b.xth2.brtherm[i] + 1n)
settype impedance rth1 rth2
plot rth1 rth2 ylimit 0 5k
ac dec 10 1 1Meg
plot db(out)
plot cph(out)
end
.endc