Need Help, LTspice SCR model
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Posted by amdx on February 23, 2007, 7:57 pm
Please log in for more thread options Hi all, I found the following model of an SCR on the web. I have tried to use it in a simple circuit and I can't seem to get it to work. It barely turns on. I would like a model for a 2N5060, I don't find one. Is there something obviously wrong with this model? Or, can someone give me a model of a small signal SCR? Thanks, Mike *SCR *Extracted from PONT_DIPH.CIR file from EDN website. *I renamed that file as SCR_CKT.CIR * Anode * | Cathode * | | Trigger * | | | .subckt SCR 1 2 3 * *Models used by the SCR Model: .model STH VSwitch (ROn=0.1, VOff=0.5) .model DLG D (Rs =25m) * *We assume that the SCR in the on-state is equivalent to 0.1 ohm: SSCR 1 4 5 0 STH VSCR 4 2 0V * *Trigger to cathode impedance is a 1k ohm resistance - fore simplification: RTrig 3 2 1k * * The following circuit locks in the on-state when a 1mA current flows *through the gate to the cathode with a positive anode to cathode voltage. *This circuit locks in the off-state when the current through the SCr tends *to become negative: VPlus 6 0 2V SiTrig 6 5 3 2 STH CState 5 0 1uf IC=0 DLogic 5 8 DLG HCur 8 0 poly(1) VSCR 1 10000 * *The potential of node 5 reflects the state of the SCR. It is less than 2V *for the off-state and between 1v and 2V in the on-stateh .ends | ||||||||||||||||
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Posted by Helmut Sennewald on February 24, 2007, 1:43 am
Please log in for more thread options Hello Mike, The SCR symbol in LTspice has the pin order Anode, Trigger, Cathode. You could either make a new symbol SCR1 with the netlist order Anode, Cathode, Trigger or you simply change the pin order in the subcircuit. Solution 1: Change the subcircuit line > * Anode
> * | Trigger * | | Cathode > * | | | > .subckt SCR 1 3 2 Solution 2: Make a copy SCR1.asy from the synbol SCR.asy. Open the new symbol SCR1.asy and change the netlist order of the gate/trigger pin to 3 and the the cathode pin to 2 as required by the original subcircuit. Both methods are ok. Take your choice. Best regards, Helmut | ||||||||||||||||
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Posted by amdx on February 24, 2007, 7:53 am
Please log in for more thread options
>> Hi all, I found the following model of an SCR on the web. I have tried to
>> use it in a simple circuit and I can't seem to get it to work. It barely >> turns on. >> I would like a model for a 2N5060, I don't find one. >> Is there something obviously wrong with this model? >> Or, can someone give me a model of a small signal SCR? >> Thanks, Mike >> *SCR >> *Extracted from PONT_DIPH.CIR file from EDN website. >> *I renamed that file as SCR_CKT.CIR >> * Anode >> * | Cathode >> * | | Trigger >> * | | | >> .subckt SCR 1 2 3 >
> Hello Mike, > > The SCR symbol in LTspice has the pin order Anode, Trigger, Cathode. > You could either make a new symbol SCR1 with the netlist order > Anode, Cathode, Trigger or you simply change the pin order in the > subcircuit. > > Solution 1: Change the subcircuit line > >> * Anode
>> * | Trigger * | | Cathode >> * | | | >> .subckt SCR 1 3 2 >
Thanks Helmut, good call, sharp of you to notice. I had already made
> > Solution 2: > > Make a copy SCR1.asy from the synbol SCR.asy. > Open the new symbol SCR1.asy and change the netlist order > of the gate/trigger pin to 3 and the the cathode pin to 2 as > required by the original subcircuit. > > > Both methods are ok. Take your choice. > > Best regards, > Helmut that change through the atribute editor. I'll revisit it just to make sure I have the labels correct. The change was in the writeup about the SCR file. Thanks, Mike | ||||||||||||||||
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> use it in a simple circuit and I can't seem to get it to work. It barely
> turns on.
> I would like a model for a 2N5060, I don't find one.
> Is there something obviously wrong with this model?
> Or, can someone give me a model of a small signal SCR?
> Thanks, Mike
> *SCR
> *Extracted from PONT_DIPH.CIR file from EDN website.
> *I renamed that file as SCR_CKT.CIR
> * Anode
> * | Cathode
> * | | Trigger
> * | | |
> .subckt SCR 1 2 3