Re: Vin vs. Load - YX logarithmic plot
Thanks a lot Dave, it looks exactly like what I need. ? J ? Jurek, are you looking for something like a solar panel I/V curve? Maybe look at the SA Sim.zip I just uploaded. ? Dave ?
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From: [email protected] <[email protected]> On Behalf Of jerzy przezdziecki via groups.io
Sent: Sunday, April 27, 2025 1:27 PM
To: [email protected]
Subject: EXTERNAL: [LTspice] Vin vs. Load - YX logarithmic plot? Hello, I would like to create a simulation of overcurrent protection circuit — a graph where the Y-axis shows the current drop (in Amperes), and the X-axis shows a linear increase of voltage in the range of 15–50 V. I expect a logarithmic curve of the current decreasing from 1.2 A down to 0 A as the voltage increases. I used the .step param function (.step param Vin 12 50 1), but that’s not what I’m looking for. ? How should I define such a graph? ? Thanks Jurek
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Re: LTspice 24.1.7 program exit
On 27/04/2025 23:22, Andy I via
groups.io wrote:
LTspice was very
robust before, and rarely crashed even when errors happened.? Some
of the recent changes (24.1.x) made it less robust.? Hopefully ADI
can restore what was lost.
I haven't got to 24.1.7 yet, but I've not noticed any increased
propensity to crash, so far. But then, I still have 24.0.12 and
17.1.15 running alongside 24.1.x.
I still use 24.0.12 as default for the same reasons as I have
highlighted in my posts. I don't like it when backward compatibility
is compromised. New features are great, provided nothing gets broken
in the process. Some of the things that were broken at first have
now been fixed, but IMHO the fixes should have been applied before
release. LTspice is not a disruptive start-up; it doesn't need to
break things, then fix them quick. Leave that to the others.
If LTspice gets a reputation for breaking, it will lose users.
Simple.
--
Regards,
Tony
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Re: Vin vs. Load - YX logarithmic plot
Jurek, are you looking for something like a solar panel I/V curve?
Maybe look at the SA Sim.zip I just uploaded.
?
Dave
?
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From: [email protected] <[email protected]>
On Behalf Of jerzy przezdziecki via groups.io
Sent: Sunday, April 27, 2025 1:27 PM
To: [email protected]
Subject: EXTERNAL: [LTspice] Vin vs. Load - YX logarithmic plot
?
Hello, I would like to create a simulation of overcurrent protection
circuit — a graph where the Y-axis shows the current drop (in Amperes), and the X-axis shows a linear increase of voltage in the range of 15–50
V.
I expect a logarithmic curve of the current decreasing from 1.2 A down to 0 A as the voltage increases. I used the .step param function (.step param Vin 12 50 1), but that’s not what I’m looking
for.
?
How should I define such a graph?
?
Thanks Jurek
|
Re: LTspice 24.1.7 program exit
LTspice was very robust before, and rarely crashed even when errors happened.? Some of the recent changes (24.1.x) made it less robust.? Hopefully ADI can restore what was lost.
?
Andy
?
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Re: LTspice 24.1.7 program exit
No, even when it states in throes of death: "untrapped err........"
--
Regards,
Tony
On 27/04/2025 22:06, John Woodgate via
groups.io wrote:
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Even
so, an app should not quit without an error message.
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Re: Vin vs. Load - YX logarithmic plot
On 27/04/2025 22:26, jerzy przezdziecki
via groups.io wrote:
Hello,
I would like
to create a simulation of overcurrent protection circuit — a graph where the
Y-axis shows the current drop (in Amperes), and the X-axis
shows a linear increase of voltage in the range of 15–50 V.
I
expect a logarithmic curve of the current decreasing from 1.2
A down to 0 A as the voltage increases. I used the .step param
function (.step param Vin 12 50 1), but that’s not what I’m
looking for.
?
How
should I define such a graph?
If you want a graph of an over-current protection circuit, what does
it matter what Vin is? Surely what you're interested in is Iout vs.
Vout?
--
Regards,
Tony
|
Vin vs. Load - YX logarithmic plot
Hello, I would like to create a simulation of overcurrent protection circuit — a graph where the Y-axis shows the current drop (in Amperes), and the X-axis shows a linear increase of voltage in the range of 15–50 V. I expect a logarithmic curve of the current decreasing from 1.2 A down to 0 A as the voltage increases. I used the .step param function (.step param Vin 12 50 1), but that’s not what I’m looking for. ? How should I define such a graph? ? Thanks Jurek
|
Re: LTspice 24.1.7 program exit
Even so, an app should not quit without an
error message.
On 2025-04-27 20:23, BRUCE108 wrote:
@eetech00: Unfortunately, you're not the author/maintainer so
what you think should or should not happen may not have much
effect on what actually happens. Many compilers will happily
EXIT when the see garbage input. All sorts of new behaviors
related to "enhanced" syntax checking have broken lots of legacy
simulation and I don't see much enthusiasm for the
authors/maintainers to back off on those changes.
--
Best wishes John Woodgate RAYLEIGH Essex OOO-Own Opinions Only
If something is true: * as far as we know - it's science *for
certain - it's mathematics *unquestionably - it's religion
|
Re: LTspice 24.1.7 program exit
@eetech00: Unfortunately, you're not the author/maintainer so what you think should or should not happen may not have much effect on what actually happens. Many compilers will happily EXIT when the see garbage input. All sorts of new behaviors related to "enhanced" syntax checking have broken lots of legacy simulation and I don't see much enthusiasm for the authors/maintainers to back off on those changes.
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Re: Diode TVS like zener in LTspice??
Please note that there are parameters epsilon=100m revepsilon=4. They represent quadratic sections.
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Re: LTspice 24.1.7 program exit
On Sat, Apr 26, 2025 at 03:58 PM, John Woodgate wrote:
It doesn't crash version 24.0.11, but it's a nonsense .ASC, isn't it? LTspice can't find I1, presumably because it's shorted.
Yes. Like I wrote, the configuration is unintentional, but nevertheless, it shouldn't cause a program exit.
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Re: LTspice 24.1.7 program exit
LTspice used to remove both I1 and D1 as they were both shorted.? But 24.1 was a major re-write and it might not do that anymore.
?
Andy
?
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Re: LTspice 24.1.7 program exit
It doesn't crash version 24.0.11, but it's a
nonsense .ASC, isn't it? LTspice can't find I1, presumably
because it's shorted.
On 2025-04-26 18:56, eetech00 via
groups.io wrote:
The following circuit configuration was unintentional, but
caused an LTspice program exit upon simulation run.
?
* Generated by LTspice 24.1.7 for Windows.
I1 0 0 1m
D1 0 0 D
V1 ADJ 0 0
.model D D
.lib (path removed)\standard.dio
.dc I1 2u 2m 100n
.backanno
.end
?
--
Best wishes John Woodgate RAYLEIGH Essex OOO-Own Opinions Only
If something is true: * as far as we know - it's science *for
certain - it's mathematics *unquestionably - it's religion
|
LTspice 24.1.7 program exit
The following circuit configuration was unintentional, but caused an LTspice program exit upon simulation run.
?
* Generated by LTspice 24.1.7 for Windows.
I1 0 0 1m
D1 0 0 D
V1 ADJ 0 0
.model D D
.lib (path removed)\standard.dio
.dc I1 2u 2m 100n
.backanno
.end
?
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Re: Sine modulated PWM voltage source (PWL file=xxx)
Back to the subject:
I managed to get the critical points resolved. There were precision problems, where the ton got negative or the pulsewidth overshooted. I fine tuned that and it is sufficient to do the filter simulation. Thanks a lot for helping.
-- Christoph
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Am 26.04.2025 um 17:11 schrieb Christoph Kukulies < kuku@...>:
?thanks :thumb up: , I understand.?
But the representation has changed during the course of me changing the account emails/aliases. -- Christoph
On Sat, Apr 26, 2025 at 10:13 AM, Christoph wrote:
formerly I was kuku@...
Just an FYI - that last one is not the email address you used, and not the one you are subscribed with.? That is the way sends out messages to members.? It needs to convert their email addresses to that form, with "@ " on the end, and the equals sign in the middle.? It has something to do with conforming to new international regulations.
?
Andy
?
_
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Re: Diode TVS like zener in LTspice??
On Sat, Apr 26, 2025 at 01:14 AM, Александр Бордодынов wrote:
Andy,
you're not quite right. Here is my clarification:
.model SMBJ24CA D(Ron=.65 Roff=50Meg Vfwd=25 epsilon=6 Vrev=25 revepsilon=6 Vpk=24 mfg=Littlefuse type=TVS)
.model SMCJ33A D(Ron=.4 Roff=8Meg Vfwd=.7 epsilon=100m Vrev=38.65 Vpk=33 revepsilon=4 mfg=Littlefuse type=TVS)
A-ha.? Yes, that's true? You used the special "conduction region-wise linear model" which is very different from the regular diode model which is based on the universal Shockley Ideal Diode equation.? The special version you used is essentially a piecewise-linear approximation of the three regions of diode conduction, and makes (almost) no attempt to model the curvature of real diode I/V curves.? I think it might be unique to LTspice.? Whereas the standard Shockley model is in every SPICE program.
?
In some cases, this alternate model is good enough.? It is described as a "computationally light weight representation of an idealized diode", meaning that it trades-off accuracy for simulation speed.
?
As you noted, it is capable of modeling both forward and reverse breakdown at similar (arbitrarily large) voltages.? It can model non-physical diodes.
?
Andy
?
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Re: Sine modulated PWM voltage source (PWL file=xxx)
On Sat, Apr 26, 2025 at 10:13 AM, Christoph wrote:
formerly I was <redacted>
interimly??<redacted>
now?<redacted>
Just an FYI - that last one is not the email address you used, and not the one you are subscribed with.? That is the way Groups.io sends out messages to members.? It needs to convert their email addresses to that form, with "@ groups.io" on the end, and the equals sign in the middle.? It has something to do with conforming to new international regulations.
?
Andy
?
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Locked
Re: Test - please ignore
On Sat, Apr 26, 2025 at 10:04 AM, Christoph wrote:
The one from my university account bounced, saying I'm not subscribed with that (physics) address. This one goes through?
Christoph,
?
I am not seeing any evidence that you either added an Email Alias for yourself, or that you subscribed (separately) from your University email address.
?
But I do see a photo in your profile.
?
I might have missed something, but it looks like things did not work the way you thought.? Let's discuss.? I will contact you offline (separately from the group).
?
Andy
?
?
|
The one from my university account bounced, saying I'm not subscribed with that (physics) address. This one goes through?
--
Christoph
|
Re: Sine modulated PWM voltage source (PWL file=xxx)
This is a test, whether both of my emails now work. Please ignore
--
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Christoph,
?
Off-topic:
?
By the way, you can register your other email address that you used earlier today that bounced.? Then you can send messages to this group from your university address and they won't bounce.? It is known as an "Email Alias" for purposes of these groups.
?
To do that, go to the LTspice group webpage, then click your name in the upper right corner and choose "Settings".? Or go directly to .??Then scroll down to "Advanced Settings for Email Aliases" and click there.? Then type your alternate email address into the box above the "Add Email Alias" button, and then click that button. ?
Adding an Email Alias tells the [LTspice] group server to accept emails send from your Alias address as if it was sent from the address you normally use for this group, and it won't bounce.
?
From Groups Help:
If the email provider you use for your account sends your outgoing messages from an address that is different from your account address, or if you want to be able to send messages to groups from an additional address (for example, a work address) that is different from your account address, you can add an email?alias?to your account:
?
Andy
?
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Tony Casey
Bell, Dave
John Woodgate
Christoph