Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

[SOLVED] Simulate Thermistors and Chokes in SIMetrix

Status
Not open for further replies.

kkeeley

Member level 3
Joined
Jul 29, 2009
Messages
59
Helped
1
Reputation
2
Reaction score
1
Trophy points
1,288
Location
Australia
Activity points
2,114
Hi,

I'm new to this board and have been reading some very interesting posts from other people, and I have found some great information.

I have just started work on designing a SMPS for a project that I have been working on for some years, and due to the complex nature and dangers of SMPS's I wish to simulate as much of the design as possible before physically build anything. I have some old PC power supplies that I was thinking of using for donors parts (Transformers, Chokes, etc). I have just started using SIMetrix and am finding it very easy to learn and use, I am now at a point where I wish to start using/creating more complex parts, like thermistors, transformers and chokes.

So my question is how do I create each of these parts, I have seen some where an example creating a sub circuit for a transformer, but I can't remember where.

Thanks for your help in advance,
Kenneth
 

analog_match

Member level 2
Joined
Nov 4, 2008
Messages
50
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,286
Location
USA
Activity points
1,641
I have used the following model of a transformer in the past. This is the spice for it. Basically on primary it is a "voltage dependant current source" with magnetizing inductance in parallel. And on secondary it is "voltage controlled voltage source".


**********************************************************
* MODEL: transformer
* Application: transformer model suitable for averaged
* circuit models
* Limitations: no losses, no leakages, two windings
**********************************************************
* Parameters:
* Lm=primary (magnetizing) inductance
* n=transformer turns ratio 1:n (primary:secondary)
**********************************************************
* Nodes:
* 1: primary-dot
* 2: primary-undot
* 3: secondary-dot
* 4: secondary-undot
**********************************************************
.subckt transformer 1 2 3 4
+params: Lm=250e-6 n=0.5
Lm 1 2 {Lm}
Gp 2 1 value={n*i(Es)}
Es 3 4 value={n*v(1,2)}
.ends
**********************************************************
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top