Constant-Voltage/Constant-current (CVCC) supply in SPICE

[Warhawk]

Guys, I completely failed. 
Could somebody share his know-how on how to simulate a CV/CC source in SPICE?
I know only the trick with an ideal diode

Code: [Select]

.model mylimit D(Ron=0, Ilim=xxx)in LTspice. However, I can't use LTspice (I am excluded from the license).

This solution does not work in ngspice.
Thanks for any tips.

[SiliconWizard]

What kind of license do you need to use LTSpice?

[Warhawk]

What kind of license do you need to use LTSpice?

"This program is specifically not licensed for use by semiconductor manufacturers in the promotion, demonstration or sale of their products. Specific permission must be obtained from Linear Technology for the use of LTspice for these applications."

[2N3055]

What kind of license do you need to use LTSpice?

"This program is specifically not licensed for use by semiconductor manufacturers in the promotion, demonstration or sale of their products. Specific permission must be obtained from Linear Technology for the use of LTspice for these applications."

So you are saying that you are working for a company that manufactures semiconductor chips, transistor or diodes, and you are planning to use Ltspice for making marketing materials...?

[Warhawk]

What kind of license do you need to use LTSpice?

"This program is specifically not licensed for use by semiconductor manufacturers in the promotion, demonstration or sale of their products. Specific permission must be obtained from Linear Technology for the use of LTspice for these applications."

So you are saying that you are working for a company that manufactures semiconductor chips, transistor or diodes, and you are planning to use Ltspice for making marketing materials...?

What the hell are you talking about? Did you even read the question?
I clearly wrote that I can't use LTspice and trying to get this running in ngspice or in pSpice. I use LTspice only for hobby.
I already found the solution which is awkwardly simple.

[2N3055]

What kind of license do you need to use LTSpice?

"This program is specifically not licensed for use by semiconductor manufacturers in the promotion, demonstration or sale of their products. Specific permission must be obtained from Linear Technology for the use of LTspice for these applications."

So you are saying that you are working for a company that manufactures semiconductor chips, transistor or diodes, and you are planning to use Ltspice for making marketing materials...?

What the hell are you talking about? Did you even read the question?
I clearly wrote that I can't use LTspice and trying to get this running in ngspice or in pSpice. I use LTspice only for hobby.
I already found the solution which is awkwardly simple.

I'm also wondering about "what the hell are you talking about" the license..
Cause that license means what I wrote.. So I'm confused and would like for you, if you're willing to, to please explain..
That is all.
Sorry for confusion, best regards,
Sinisa

P.S. Maybe something like this:
https://www.edn.com/design/other/4351913/EDN-Access--03-03-94-Spice-model-mimics-realistic-current-sourc

https://www.spectrum-soft.com/news/spring2005/ilim.shtm

[SiliconWizard]

What kind of license do you need to use LTSpice?

"This program is specifically not licensed for use by semiconductor manufacturers in the promotion, demonstration or sale of their products. Specific permission must be obtained from Linear Technology for the use of LTspice for these applications."

Oh damn. I've used LTSpice quite a lot, but only for design purposes, so never found myself in that position really. So that didn't even cross my mind.

Anyway, I guess you could do that with an arbitrary behavioral voltage source (B) or something...

[Jay_Diddy_B]

Hi,

Here is a circuit that I use for cvcc power supplies in LTspice. It should be possible to implement in other versions of SPICE.




And the modelling results:






The .model IdealDiode D(Vfwd=0.1m) statement makes the diode with 100uV forward voltage.

I have attached the model.

Jay_Diddy_B

[Jay_Diddy_B]

Hi,

If the version of SPICE you are using has trouble with .model statement

.model IdealDiode D(Vfwd=0.1m)

Try

.model IdealDiode D( N=0.001)


This should be understood by all versions of SPICE.

Regards,

Jay_Diddy_B

[RoGeorge]

However, I can't use LTspice (I am excluded from the license).

Use QUCS instead, QUCS is GPL licensed
https://en.wikipedia.org/wiki/Quite_Universal_Circuit_Simulator

[Warhawk]

Hello Everyone, I am back from holiday. Refreshed and optimistic again. 

@2N3055
- I was not sure if you were really asking a question or was just being mean. I apologize for my tone before. I can't use LTspice because I work for ADI's/LTC's competition in the very
mentioned area.

@SiliconWizard
- Yeah, I used to use LTSpice a lot but now only for hobby. KiCad's implementation of ngspice is far from usable

@Jay_Diddy_B
- Sweet, I'll try this. I used a similar configuration but with a voltage controlled switch that acts as an ideal diode. It still has some limitations though.

@RoGeorge
- Thanks for the tip. I was able to get a floating pSpice license but I'll check your software too.


Thanks everyone for your contribution.

[2N3055]

Hello Everyone, I am back from holiday. Refreshed and optimistic again. 

@2N3055
- I was not sure if you were really asking a question or was just being mean. I apologize for my tone before. I can't use LTspice because I work for ADI's/LTC's competition in the very
mentioned area.

Fair enough. You can't know people intentions over ASCII characters. No hard feelings. I just kindly ask for the benefit of the doubt if there is next time ... I'm not native English speaker, so it's hard to express both facts and tone...

All the best,
Sinisa