Keyboard Shortcuts
ctrl + shift + ? :
Show all keyboard shortcuts
ctrl + g :
Navigate to a group
ctrl + shift + f :
Find
ctrl + / :
Quick actions
esc to dismiss
Likes
- LTspice
- Messages
Search
|
Re: Mechanical switch
Hi, :
I found a article talking about the breakdown voltage when arcing happens. At here: (of course, I am not good at this, it's just discussed. Not sure what's the exact correct answer.) From the article, it says through the Paschen's law, it could decide the breakdown voltage depends on the distance & gas pressure.It's not linearity. So under some certain situation (fixed pressure, distance), in the instantaneous time point of the switch on -> off, the contact point where arcing happens should be the most tendency point referring to the "Paschen curve" where pd product is the value at which the breakdown voltage is the lowest. So the breakdown voltage is able to be estimated, the current flowing through the inductor should be continuous ,supposed it's Ipeak, the instantaneous energy stored in the inductor is 1/2*L*Ipeak^2, and this energy should dissipated through the arcing time, which it's supposed to be V(t)*I(t)*dt (V(0)=breakdown voltage, I(0)=Ipeak, t=0 when arcing happens). Otherwise, maybe there is another path which also consumes the energy. Just for simple reference. Appreciate for any opinion to discuss this, so far , I can't find any further article which talking about this on internet. (But I really like to know more about this.) Best regards. ? |
|
Re: Thyristor library
¿ªÔÆÌåÓýHassan wrote:"I am new here..." In that case the suggestion in the welcome message to search the group's Files section will still be fresh in your mind. Had you done this you might have found this: Additionally, LTspice already comes with SCR and TRIAC symbols in the "Misc" folder. No need to search "all over the internet"! Regards, Tony |
|
Re: Thyristor library
Hello Hassan.
toggle quoted message
Show quoted text
The fastest way is to download a my folder from LTwiki.org Go to and (A Large LTspice Folder from Bordodynov). LTC\LTspiceIV\lib\sym\EXTRA\ST\SCR\ LTC\LTspiceIV\lib\sym\EXTRA\ST\TRIAC\ LTC\LTspiceIV\lib\sym\EXTRA\TECCOR\SCR\ LTC\LTspiceIV\lib\sym\EXTRA\TECCOR\TRIAC\ Bordodynov. 03.08.2016, 10:17, "someone00044@... [LTspice]" <ltspice@...>: Hello together, |
|
Re: Mechanical switch
Hi.
toggle quoted message
Show quoted text
See file bounce.zip in TEMP folder. Bordodynov. 03.08.2016, 09:44, "Vlad imbvlad@... [LTspice]" <ltspice@...>: There is a spark gap model in the group's files, maybe it can be combined with the bounce relay? |
|
Re: Mechanical switch
There is a spark gap model in the group's files, maybe it can be combined with the bounce relay? Vlad ______________________ -- holding, among others: a universal analog/digital filter, block-level models for power electronics (and not only), math blocks with a more stream-lined approach, some digital ADC, DAC, (synchronous-)counter, JKflop, etc. |
|
Re: Current Dependent Voltage Source
> What if I want to input a table of data I measured from a unit?? I
have multiple input/output pairs that I want to use.? How would I do
this? Then you don't need a current/voltage dependent current/voltage source, just a behavioural source or a VCVS/CCVS. For behavioural sources, the syntax is:Vlad ______________________ -- holding, among others: a universal analog/digital filter, block-level models for power electronics (and not only), math blocks with a more stream-lined approach, some digital ADC, DAC, (synchronous-)counter, JKflop, etc. |
|
Thyristor library
Hello together,
I am new here and I've searched all over the internet to get the full library of a Thyristor but I couldnt :( I have found either the .lib file or the symbol !!! could anybody kindly upload the full library so that we can use it directly. Please feel free to share your experience :)) thanks in advance! Hassan |
|
Re: Mechanical switch
Hi, :
I guess the question would become ''how to describe the physics behavior about eg. ionization in the air in math equations, and cross voltage before/after acring, and so on..." I am really interested in those topics, but I can't quite know the terminologies of those topics (about arcing, sparking behavior in physics). I thinks that's the background knowledge required to built-in the model of spice. If someone could provide any information about this ? thank you Best regards. ---In LTspice@..., <kc6ete@...> wrote : The bounce is less interesting to me than the spark.? Think kettering ignition system. |
|
Re: Current Dependent Voltage Source
What if I want to input a table of data I measured from a unit?? I have multiple input/output pairs that I want to use.? How would I do this?? Sent from Yahoo Mail. On Monday, August 1, 2016 11:50 PM, "Andy ai.egrps@... [LTspice]" wrote:
?
rmoreno.phone?wrote: ? ?"I've tried to understand how to create a current dependent voltage source but am unable to comprehend how to get my simulation circuit to work.? Is there anything available to describe in detail how to do this?" Yes; there is the LTspice Help page for H-elements (current-dependent voltage sources).? But most of the reference descriptions there are most helpful for SPICE Netlists, and are a little vague about applying the same syntax to schematic symbols. Assuming that you are using a schematic: Voltage sources are our "ammeters".? Put a voltage source (probably set to 0V, but could be non-zero if that fits the rest of your circuit) in the branch where you want to sense the current, that will control your CCVS. Add an H element where you want it.? Then right-click on the H that is by itself.? Edit that field so that it looks something like this: Vxxx yyy.y where Vxxx is the name (reference designator) of the voltage source that is the "ammeter", and yyy.y is the transresistance or gain (in ?volts/amps) that you want. Andy |
|
Re: Need help to design a transimpedance amplifier
¿ªÔÆÌåÓýUnlike a conventional op-amp circuit, the capacitance at the summing junction is extraordinarily important for bandwidth and stability. You can discover this through simulation. Likewise, you can use simulation to explore the requirements for gain-bandwidth product and such. Be aware that often, secondary parameters such as input capacitance are NOT included in simulation models unless the model uses actual transistors for the input stage rather than just a behavioral model.Jim James Wagner Oregon Research Electronics
|
|
Re: Mechanical switch
I tried to sign up normally. Its a catch 22. On Aug 2, 2016 9:39 PM, "Andy ai.egrps@... [LTspice]" <LTspice@...> wrote:
|
|
Re: Need help to design a transimpedance amplifier
To?t.obulesu: I think you don't have a good understanding of the problem you are trying to solve.? You asked this question twice already.? You got an answer before too, which you apparently ignored.? I get the feeling you do not understand what the constraints and the requirements are.? Your expectations are unrealistic. FYI, this is not a place to help you design your circuit.? We can help with the simulations, once you have a circuit. Regards, Andy |
|
Re: Unable to find InstName attribute in LTSpice for mac
Hello,
I haben't got an answer from Mike so far.? In the meantime you could start with an existing symbol like?opamp2 from folder [Opamps].? Open this symbol and then do a "File->Save as" with the new name. Now modify this symbol and save it. Best regards, Helmut |
|
Re: Looking for a IDT74CBTLV3253 model.
A reply I sent earlier, disappeared (never made it). Here it is again:
Gunoi Nare wrote: "As I said before, opening this file returns the error "Multiple flag."" You had a bad (corrupt) download. Perhaps you are using Firefox, and perhaps you asked Firefox to open the file in LTspice. Don't do that. Instead, download and SAVE the file to your disk. After it has downloaded and saved, then go to Windows Explorer, find the file, and then open it in LTspice. Regards, Andy |
Tony Casey
to navigate to use esc to dismiss