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In message <256711374134677@...>, dated Thu, 18 Jul 2013, =?koi8-r?B?4czFy9PBzsTSIOLP0sTPxNnOz9c=?= <BordodunovAlex@...> writes:

John Woodgate, I had a similar problem when using the ". inc". It was a month or two ago. I do not remember. I wanted to place the sample in the group, but gave LTspice is the same message as you. I think it bugs LTspice. Then I decided to put the model to the page of the electronic circuit. Then I discovered that you can reference on library in the symbol. Library while in the current folder.
Try to upgrade.

I have version 4.19m, the latest. I can make the simulation run by copying the .subckt to the schematic. I can see that 'winding0' is the VALUE in the symbol Winding0.asy', but I don't see how LTspice knows it should look in Core.lib for the subckt.
--
OOO - Own Opinions Only. See www.jmwa.demon.co.uk
Why is the stapler always empty just when you want it?

John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK

John Woodgate, I had a similar problem when using the ". inc".
It was a month or two ago. I do not remember. I wanted to
place the sample in the group, but gave LTspice is the same message as you. I think it bugs LTspice.
Then I decided to put the model to the page of the electronic circuit. Then I discovered that you can reference on library in the symbol. Library while in the current folder.
Try to upgrade.
Bordodynov.

18.07.2013, 11:13, "John Woodgate" <jmw@...>:

In message <622831374124699@...>, dated Thu, 18 Jul 2013, =?koi8-r?B?4czFy9PBzsTSIOLP0sTPxNnOz9c=?= <BordodunovAlex@...> writes:

In my example, there is no need to use DOT commands ".inc" and ". Lib".

I know; I was trying to find out why I have the problem.

LTspice allows it. Link to the library name within the symbol "Winding0.asy". Just run the simulation.

It still doesn't run. I will try downloading again.
--
OOO - Own Opinions Only. See www.jmwa.demon.co.uk
Why is the stapler always empty just when you want it?

John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK

Hello,

Running an dc/dc example named 3765.asc with slightly lowered feedback resistor (4.42 --> 4.2k) gives Vout appr. several times bigger than expected.
Just the opposite what we should expect while lowering the feedback resistor.
It can be even dangerous to the sensitive load.

Why it behaves this way ?

Hi.
Look:
.MODEL MPS4250 PNP IS =2.01722E-14 NF=1.00872 VAF =55.5699 IKF= 0.108955 ISE = 6.37359E-16 NE =1.35818 BR =4.41291 NR= 1.02097 VAR= 6.54054 IKR = 0.0178791 ISC =2.78089E-14 NC=1.13928 RB = 85.9809 RE= 0.260437 EG=1.11 XTI = 3 CJE= 9.35999p VJE = 0.805219 MJE= 0.390963 VJC = 0.270529 MJC= 0.295929 FC= 0.5 BF =3.213490E+02 CJC = 6.39675p RC=2.2484 TF=1.0E-10 XTF =1

Bordodynov.

17.07.2013, 20:04, "jean_claudeabeille" <jean_claudeabeille@...>:

--- In LTspice@..., John Woodgate <jmw@...> wrote:

In message <93141374063607@...>, dated Wed, 17 Jul 2013,
=?koi8-r?B?4czFy9PBzsTSIOLP0sTPxNnOz9c=?= <BordodunovAlex@...>
writes:

The model is in the file CORE.LIB. The symbol contains the name of the
library.

Then it's very odd that my computer can't find it. Anyway, thanks for
the explanation.
--
OOO - Own Opinions Only. See www.jmwa.demon.co.uk
Why is the stapler always empty just when you want it?

John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK

John,

It worked fine for me. There must be an issue with your PC.

Rick

Hi John Woodgate.
In my example, there is no need to use DOT commands ".inc" and ". Lib". LTspice allows it. Link to the library name within the symbol "Winding0.asy". Just run the simulation.
Bordodynov.

17.07.2013, 20:19, "John Woodgate" <jmw@...>:

Hi Tony,
I just need something for higher frequency, say 10MHz.

--- In LTspice@..., legg@... wrote:

--- In LTspice@..., "sawreyrw" <sawreyrw@> wrote:

--- In LTspice@..., legg@ wrote:

Here's an example of a material exhibiting reduced permeability with frequency.



RL

The link doesn't show anything about permeability vs. frequency.

Rick

Material permeability is directly related to inductance of the sample, if only the frequency changes in the test.

RL

RL,

I understand that, but there is no function of frequency shown at that link. If you don't think that is the case, double check it.

Rick

--- In LTspice@..., "sawreyrw" <sawreyrw@...> wrote:

--- In LTspice@..., legg@ wrote:

Here's an example of a material exhibiting reduced permeability with frequency.



RL

The link doesn't show anything about permeability vs. frequency.

Rick

Material permeability is directly related to inductance of the sample, if only the frequency changes in the test.

RL

--- In LTspice@..., Dhara Weerasinghe <the_sky_falcon@...> wrote:

Hi All,
?
Thanks so much for your help. I got it to work. I used :
?
K L1 L2 {X}
?
.step param {X} 0.01 0.07 0.01
?
Thanks again for your help.?
?
Falcon

[Non-text portions of this message have been removed]

Falcon,

You got lucky. Even though you were given the right syntax, you chose not to use it.

The K statement should use the Kx syntax, where x is usually numeric, but must be unique. If there is only one K statement, it will obviously be unique, but as soon as you introduce another, you must explicitly make it so.

Secondly, the curly braces are not appropriate in the .step param statement. LTspice often silently ignores syntax errors, but that shouldn't be a guiding principle.

Perhaps you should read the manual. (Usual expletive omitted.)

Regards,
Tony

--- In LTspice@..., "gmebey" <gmebey@...> wrote:

I have a simulation of a open loop SMPS that I would like to know the transformer losses, but using the following script gives an efficiency of >100%.....which I know is not true.

After digging a bit I came across a example in the files area for AC power, complex_power1_meas-1.asc. But the notes state "Steady State Power Calculation With Pure Sine Voltages And Linear Components".

My question is will this same approach work for a rectangle waveform?


.param mes_start=6m mes_end=9.9m

.meas TRAN Vrms_pri RMS V(vpri1,vpri2) from {mes_start} to {mes_end}
.meas TRAN Irms_pri RMS I(L1) from {mes_start} to {mes_end}
.meas Ppri PARAM Vrms_pri*Irms_pri

.meas TRAN Vrms_can RMS V(vac_can1,vac_can2) from {mes_start} to {mes_end}
.meas TRAN Irms_can RMS I(L2) from {mes_start} to {mes_end}
.meas Pcan PARAM Vrms_can*Irms_can

.meas TRAN Vrms_rs RMS V(vac_rs1,vac_rs2) from {mes_start} to {mes_end}
.meas TRAN Irms_rs RMS I(L3) from {mes_start} to {mes_end}
.meas Prs PARAM Vrms_rs*Irms_rs

.meas eff_tx PARAM (Pcan+Prs)/Ppri

Hello,

Discounting errors in the scripts, "measured" efficiencies of greater than 100%, are often due to not waiting long enough before deciding "steady state" has been reached. If there is significant ringing in the SMPS transient response and the measurement interval is over a period of net downward trajectory of the output voltage, it is easily possible that more energy is being taken out of the system than is being put in. You should do some sanity checks that prove that you are not in such a region.

First step: try doubling the simulation time.

Conversely, an upward trajectory in voltage could indicate a pessimistic estimation of efficiency.

Regards,
Tony

In message <ks6pg9+ovi6@...>, dated Wed, 17 Jul 2013, sawreyrw <sawreyrw@...> writes:

A K statement is not directly applicable to a nonlinear inductor.

But that is exactly what the thread is about!
--
OOO - Own Opinions Only. See www.jmwa.demon.co.uk
Why is the stapler always empty just when you want it?

John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK

--- In LTspice@..., John Woodgate <jmw@...> wrote:

In message <ks6lf3+t8c1@...>, dated Wed, 17 Jul 2013, sawreyrw
<sawreyrw@...> writes:

There is no reason you can't use x as a parameter. The only thing
special about x is that it is used to represent the current in a
nonlinear inductor and the volt across a nonlinear capacitance, but it
is not visible outside the component model.

I just recommend not using it in order to avoid what would appear to be
inexplicable error, especially where the context is, indeed, non-linear
inductors.
--
OOO - Own Opinions Only. See www.jmwa.demon.co.uk
Why is the stapler always empty just when you want it?

John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK

John,

I know the statement flux={x}*tanh(x) looks strange, but LTspice knows that the parameter x is not the current x. Of course, I wouldn't recommend it, because of the possible confusion others might have. A K statement is not directly applicable to a nonlinear inductor.

Rick

Rick

In message <ks6lf3+t8c1@...>, dated Wed, 17 Jul 2013, sawreyrw <sawreyrw@...> writes:

There is no reason you can't use x as a parameter. The only thing special about x is that it is used to represent the current in a nonlinear inductor and the volt across a nonlinear capacitance, but it is not visible outside the component model.

I just recommend not using it in order to avoid what would appear to be inexplicable error, especially where the context is, indeed, non-linear inductors.
--
OOO - Own Opinions Only. See www.jmwa.demon.co.uk
Why is the stapler always empty just when you want it?

John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK

--- In LTspice@..., John Woodgate <jmw@...> wrote:

In message <1374056490.61943.YahooMailNeo@...>,
dated Wed, 17 Jul 2013, Dhara Weerasinghe <the_sky_falcon@...>
writes:

?
Thanks so much for your help. I got it to work. I used :
?
K L1 L2 {X}
?
.step param {X} 0.01 0.07 0.01
?
Thanks again for your help.?
?

It works in this case, but don't use X or x for an independent variable,
because it has a special meaning in some contexts. {K} or {KA} work.
--
OOO - Own Opinions Only. See www.jmwa.demon.co.uk
Why is the stapler always empty just when you want it?

John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK

John,

There is no reason you can't use x as a parameter. The only thing special about x is that it is used to represent the current in a nonlinear inductor and the volt across a nonlinear capacitance, but it is not visible outside the component model.

Rick

In message <ks6d15+3s9u@...>, dated Wed, 17 Jul 2013, jean_claudeabeille <jean_claudeabeille@...> writes:

Can anybody here tell me where I can find a spice model for this PNP ? Thank you;

Apart from the packaging, it is similar to a BC556 or BC557.
--
OOO - Own Opinions Only. See www.jmwa.demon.co.uk
Why is the stapler always empty just when you want it?

John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK

In message <20130717075502.CBBBA34B@...>, dated Wed, 17 Jul 2013, Macy <macy@...> writes:

Did a search for 'content' of files, in my case all were text files, looking for a specific phrase. so I was looking inside *.txt for "paramagnetic" to appear anywhere.

My problem is different. I can open Core.lib in a real text reader (not Notepad) and see SUBCKT Winding0 there, but even with .inc core.lib added to the schematic as a Spice directive, I still get the error message 'Unknown subckt called in xu1 in n004....'

All files are saved to Desktop.
--
OOO - Own Opinions Only. See www.jmwa.demon.co.uk
Why is the stapler always empty just when you want it?

John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK

Come on. *.txt files laced throughout the Program File space?

No way. These files were ALL files in the working space, data, and information areas.


Plus, WinXP so badly 'improved' some other built-in programs, I had to substitute the old versions from Win98 for them to operate correctly. two examples: old Notepad and MSPaint

But a bit off topic here, so will stop.




--- alan.b.pearce@... wrote:

From: <alan.b.pearce@...>
To: <LTspice@...>
Subject: RE: [LTspice] Changing the mutual inductance coefficient of K statements with time
Date: Wed, 17 Jul 2013 15:04:50 +0000

On Win98 systems - NO PROBLEM, found every file containing the text.

On WinXP Pro - NEVER found the files!!! [using that obnoxious 'puppy' search tool]
[Note: the identical files are mirrored/synced on ALL machines] To verify, I went to
the known files, and yes, the words were in the files, but that !@#$#!@#$ WinXP
search puppy NEVER found the files !!!

Again you see, why I use the Win98 systems?

Anyway a heads up, I was told on the WinXP group that searching always fails and to
use a different search tool, 3rd party, Agent Ransack. {?]

I suspect that what you are seeing is the difference in security systems that exist from WinXP onwards where files in the 'program Files' and 'Program Files (x86)' directories are considered to not be data files, and if your installation has put the data files there (by implication from your statement about files being synched across systems) then they may well be ignored by tools looking for data files.

Feel free to use a system that has no basic security against virus infestation such as your Win98 machine if that is the way you want to work.

Can anybody here tell me where I can find a spice model for this PNP ?
Thank you;