LTspice / SwitcherCAD III and Bridge Rectifier question

C

Chretien

Guest
I am a novice. And even more of a novice at this spice program.

I am trying to "play" with the program to see how it works etc. So Im taking
some schematics and replicating them in the spice program to see how it
works.
My current sample project requires a 1 Amp 200V Bridge Rectifier.

I cannot see this component in the components list. Am I missing something?
Am I suppose to use 4 Diodes as a work around or should I move to the next
step in this program and make a new component?

Regards.
 
"Chretien" <Cretian@123.com> wrote in message
news:t9qdnV3xCJBlA6XfRVn-sQ@rogers.com...
I am a novice. And even more of a novice at this spice program.

I am trying to "play" with the program to see how it works etc. So Im taking
some schematics and replicating them in the spice program to see how it
works.
My current sample project requires a 1 Amp 200V Bridge Rectifier.

I cannot see this component in the components list. Am I missing something?
Click to expand...
You have learned, early, the widely known fact
that the available models (assuming they are any
good) are a big part of the value of any simulator
package.

Am I suppose to use 4 Diodes as a work around or should I move to the next
step in this program and make a new component?
Click to expand...
For playing, if you can find some 1A 200V
diodes, just hook them up and be happy. Or,
if you want to play with component creation,
do that. Library editors can be a real challenge.

Have fun.

--
--Larry Brasfield
email: donotspam_larry_brasfield@hotmail.com
Above views may belong only to me.
 
"Larry Brasfield" <donotspam_larry_brasfield@hotmail.com> wrote in message
news:Zj1_d.21$fG.754@news.uswest.net...
"Chretien" <Cretian@123.com> wrote in message
news:t9qdnV3xCJBlA6XfRVn-sQ@rogers.com...
I am a novice. And even more of a novice at this spice program.

I am trying to "play" with the program to see how it works etc. So Im
taking
some schematics and replicating them in the spice program to see how it
works.
My current sample project requires a 1 Amp 200V Bridge Rectifier.

I cannot see this component in the components list. Am I missing
something?

You have learned, early, the widely known fact
that the available models (assuming they are any
good) are a big part of the value of any simulator
package.

Am I suppose to use 4 Diodes as a work around or should I move to the
next
step in this program and make a new component?

For playing, if you can find some 1A 200V
diodes, just hook them up and be happy. Or,
if you want to play with component creation,
do that. Library editors can be a real challenge.

Have fun.

--
--Larry Brasfield
email: donotspam_larry_brasfield@hotmail.com
Above views may belong only to me.


Thanks for the input.
Click to expand...

I think I have seen that some manufacturers have (of course) their own
components that you can download and put into these programs. Is this
something worthy to do?
eg. see link for a nice collection
http://homepages.which.net/~paul.hills/Circuits/Spice/ModelIndex.html

I would rather spend my time on developing the project than developing the
project that's developing the project if you know what I mean.

How do you use these files anyway I can't seem to see any import mecanism?

Regards
 
"Chretien" <Cretian@123.com> wrote in message
news:XP-dnS-Xh8q_OqXfRVn-qg@rogers.com...
"Larry Brasfield" <donotspam_larry_brasfield@hotmail.com> wrote in message
news:Zj1_d.21$fG.754@news.uswest.net...
"Chretien" <Cretian@123.com> wrote in message
news:t9qdnV3xCJBlA6XfRVn-sQ@rogers.com...
I am a novice. And even more of a novice at this spice program.
I am trying to "play" with the program to see how it works etc. So Im taking
some schematics and replicating them in the spice program to see how it
works.
My current sample project requires a 1 Amp 200V Bridge Rectifier.

I cannot see this component in the components list. Am I missing something?

You have learned, early, the widely known fact
that the available models (assuming they are any
good) are a big part of the value of any simulator
package.

Am I suppose to use 4 Diodes as a work around or should I move to the
next step in this program and make a new component?

For playing, if you can find some 1A 200V
diodes, just hook them up and be happy. Or,
if you want to play with component creation,
do that. Library editors can be a real challenge.

Thanks for the input.
Anytime.
Click to expand...

I think I have seen that some manufacturers have (of course) their own
components that you can download and put into these programs. Is this
something worthy to do?
Click to expand...
Yes, especially if you will be simulating "real"
circuits (using "real" parts and which will end
up becoming actual hardware), where their
performance or predictability matters.

eg. see link for a nice collection
http://homepages.which.net/~paul.hills/Circuits/Spice/ModelIndex.html
Click to expand...
I'll take a look, thanks.

I would rather spend my time on developing the project than developing the
project that's developing the project if you know what I mean.
Click to expand...
If you are merely interested in play, it hardly
matters what you do if you enjoy it. But if
your play is a learning exercise, with some
future useful application in mind, then you
would do well to get past the "pull in what
appears in the menus, hook it up, hit run"
phase. Using models not provided by the
simulator vendor is an important part of that.

How do you use these files anyway I can't seem to see any import mecanism?
Click to expand...
In SwitcherCAD and most other SPICE simulators,
you can arrange for whatever statements you like to
end up in the "(card) deck" that is actually input to
the simulation engine.

Lookup the help on the .MODEL and .SUBCKT
directives. By including the models you get from
a manufacturer (which will generally be in either
model or subcircuit form) as text items in your
schematic, marked as "SPICE directive" in the
dialog that creates/edits them, you can make the
models available. By slightly editing the devices
you use, they can be made to use those models.

There is a whole different scheme for incorporating
models, subcircuits and schematics into library
components you create. See the help for that.

There is a forum for LTSpice on Yahoo. That
would be a better place take the more detailed
questions that will surely arise as you proceed.

--
--Larry Brasfield
email: donotspam_larry_brasfield@hotmail.com
Above views may belong only to me.
 
"Larry Brasfield" <donotspam_larry_brasfield@hotmail.com> wrote in message
news:372_d.23$fG.1046@news.uswest.net...
"Chretien" <Cretian@123.com> wrote in message
news:XP-dnS-Xh8q_OqXfRVn-qg@rogers.com...
"Larry Brasfield" <donotspam_larry_brasfield@hotmail.com> wrote in
message
news:Zj1_d.21$fG.754@news.uswest.net...
"Chretien" <Cretian@123.com> wrote in message
news:t9qdnV3xCJBlA6XfRVn-sQ@rogers.com...
I am a novice. And even more of a novice at this spice program.
I am trying to "play" with the program to see how it works etc. So Im
taking
some schematics and replicating them in the spice program to see how
it
works.
My current sample project requires a 1 Amp 200V Bridge Rectifier.

I cannot see this component in the components list. Am I missing
something?

You have learned, early, the widely known fact
that the available models (assuming they are any
good) are a big part of the value of any simulator
package.

Am I suppose to use 4 Diodes as a work around or should I move to the
next step in this program and make a new component?

For playing, if you can find some 1A 200V
diodes, just hook them up and be happy. Or,
if you want to play with component creation,
do that. Library editors can be a real challenge.

Thanks for the input.
Anytime.

I think I have seen that some manufacturers have (of course) their own
components that you can download and put into these programs. Is this
something worthy to do?

Yes, especially if you will be simulating "real"
circuits (using "real" parts and which will end
up becoming actual hardware), where their
performance or predictability matters.

eg. see link for a nice collection
http://homepages.which.net/~paul.hills/Circuits/Spice/ModelIndex.html

I'll take a look, thanks.

I would rather spend my time on developing the project than developing
the
project that's developing the project if you know what I mean.

If you are merely interested in play, it hardly
matters what you do if you enjoy it. But if
your play is a learning exercise, with some
future useful application in mind, then you
would do well to get past the "pull in what
appears in the menus, hook it up, hit run"
phase. Using models not provided by the
simulator vendor is an important part of that.

How do you use these files anyway I can't seem to see any import
mecanism?

In SwitcherCAD and most other SPICE simulators,
you can arrange for whatever statements you like to
end up in the "(card) deck" that is actually input to
the simulation engine.

Lookup the help on the .MODEL and .SUBCKT
directives. By including the models you get from
a manufacturer (which will generally be in either
model or subcircuit form) as text items in your
schematic, marked as "SPICE directive" in the
dialog that creates/edits them, you can make the
models available. By slightly editing the devices
you use, they can be made to use those models.

There is a whole different scheme for incorporating
models, subcircuits and schematics into library
components you create. See the help for that.

There is a forum for LTSpice on Yahoo. That
would be a better place take the more detailed
questions that will surely arise as you proceed.

--
--Larry Brasfield
email: donotspam_larry_brasfield@hotmail.com
Above views may belong only to me.
Click to expand...
Thanks for your advice and helpful hints.
I'll persevere. Right now Im just trying to understand the program. Its just
for enjoyment and hobby.
I'll also look at the LTSpice forum for a little more On Topic help.

Regards
 
Chretien wrote:

Thanks for your advice and helpful hints.
I'll persevere. Right now Im just trying to understand the program. Its just
for enjoyment and hobby.
I'll also look at the LTSpice forum for a little more On Topic help.
Click to expand...
In that case, I suggest you just use 4 of the generic ideal diode on
the tool bar connected as a bridge. The voltage drop won't be exactly
what some particular bridge component produces, but the result will be
representative of most diode bridges.

--
John Popelish
 
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