Re: [ng-spice] Switch problems / solutions . . .


To ng-spice@ieee.ing.uniroma1.it
From "GLAO S. Dezai" <dezai@hotbot.com>
Date Fri, 27 Oct 2000 08:57:55 -0700
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On Fri, 27 Oct 2000 14:52:44   Alan Gillespie wrote:
>The code for the switch could be changed, probably by adding
>"levels" to the model.


I aggree with this. Here is really a lack wich has limitated spice usage, in 
power electronics circuit simulation. To implement good switching mechanism 
in transient simulation  , one must (i think) have a look on the time 
stepping process in the spice3 algorithm. Switching effect require really an 
event driven time-stepping process like what is used for mixed-mode 
simulation  time-stepping mechanism to fit the switching instant. So switches 
have to contribute also to the timestep instead of using only reactive 
elements.
After this, differents switches could be coded with different level : Power 
BJT, Power Diode(internally controlled switch), SCR, IGBT etc.


Could we use  XSPICE event-driven transient simulation core ?
Dezai GLAO




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