Nixie Power Supply Design Question . . . Suggestions?

[HepaxCodex]

I am trying to make my first nixie tube setup and I am struggling with the powersupply.

Testing out the old analog knowledge is kicking this digital guy's butt!

I am working with ModelSim to simulate the circuit (Are other tools better?  GPL?).

I decided to test this circuit out

http://www.ledsales.com.au/kits/nixie_supply.pdf 

because I couldn't find the models for this guy (which was also recommended throughout the web).

http://www.desmith.net/NMdS/Electronics/NixiePSU.html 

Unfortunately, when I model the circuit I only get 30V on the output and can't seem to figure out why.

Here is the circuit sim in modelsim (after 4ms have elapsed): Note that things are a bit re-arranged from the

ledsales diagram.

http://imgur.com/8A2si 

Is this a good power supply to start with?  I want to expand it over time but I need to refresh my circuit design knowledge significantly. 

Any help as to why this is not working?

Also what tools do people use to help simulate and verify things? 

Thanks for all the help!!

HepaxCodex

[Michel]

That is a very popular HV power supply, no need to simulate it, just
buy it and you will see it will work.

Michel

On Jul 1, 12:37 am, HepaxCodex <hepaxco...@gmail.com> wrote:
> I am trying to make my first nixie tube setup and I am struggling with the
> powersupply.
> Testing out the old analog knowledge is kicking this digital guy's butt!
>
> I am working with ModelSim to simulate the circuit (Are other tools better?
>  GPL?).
>

> I decided to test this circuit outhttp://www.ledsales.com.au/kits/nixie_supply.pdf

>
> because I couldn't find the models for this guy (which was also

> recommended throughout the web).http://www.desmith.net/NMdS/Electronics/NixiePSU.html

[Nick]

On Saturday, 30 June 2012 15:37:33 UTC+1, HepaxCodex wrote:

because I couldn't find the models for this guy (which was also recommended throughout the web).

http://www.desmith.net/NMdS/Electronics/NixiePSU.html 

I have a MAX1771 mixed-mode model that I made myself for LTspice, but its very slow, probably because I'm emulated it with a bunch of other sub-circuits.

Emulating SMPS is a bit of a dark art - its the whole reason that LTspice was written - unfortunately, Linear Tech only supply high-speed models for their own chips :-)

  

No reason to emulate it - as has been pointed out elsewhere, these PSUs are well understood, and modelling them doesn't compensate for layout and other environmental conditions...