PWM controller

[kkwan]

I need a simulation model of PWM controller in Multisim, but I discovered that all PWM controller models in DB are empty.  In other words, they are not simulatable.  Does anyone happen to know that any type of PWM controllers out there is supported by Multisim PSPICE?

Really appreciate for the help in advance.

Anadig

[Tien_P]

Hi Anadig,

Have a look at this link:

http://electro4um.com/about692-asc.html

 There are several PWM models at that webpage, and you have known a little bit about SPICE syntax. 

The beginning of a SPICE model have a '.subckt" statement and the model ends with an ‘.ends‘  statement.  The person who posted these models divided them what is shown below 

*========================================

.subkct xxxxx

.ends

*******

You should copy everything in between and then create you own component, If you don't know how take a look at this tutorial from here:

http://zone.ni.com/devzone/cda/tut/p/id/3173

[educ]

Hi. This is not a working site. Do you have other recommendation?

electro4um.com/about692-asc.html

[Andrew_Boniface]

I am considering developing an ODE solver engine specifically for the simulation issues presented by PWM.  General -purpose solvers either have poor accuracy or miniscule stepsize because of discontinuities at the transitions between pulses.  Andrew Boniface