Using Simetrix Pspice For Simple Rectifier Circuit

Hello,

I wonder if I could have some help using this software, I have built a simple circuit which is just an AC voltage source to a transformer then a rectifier, smoothing capacitor and load.

Whenever I attach a ground to the rectifier section and run the circuit I get DCOP failed. I've even tried connecting the ground through a very high resistance but it doesn't make a difference.

I really need to graph the output of the smoothing section, but I'm not getting anywhere with this, I know I need a ground connected for a reference voltage.

Never have this type of problem with a breadboard and real components!

Cheers

I'd like to add, I downloaded Tina, and was able to use a transformer to step down from 230V to 23V in 5 min.

Problem is this crappy Simetrix software is what I have to use for my assignments, so I'll be hugely grateful if someone can help me with this.

If you are referencing the Tx1 probe to gnd, then the 25 Ohms and 1M parallel resistors may be treated like a potential divider by the modelling software. Hence the 40mV or so output.

Try using a differential mode probe hooked across the R1 25 Ohms resistor AC coupled.

Probe|Place FixedDiff. Voltage Probe...

Doesn't seem to be working at all mate, all I have now is a 25 ohm load resistor on each winding and it's still giving me the same output. There is no potential divider now.

Unfortunately I'm not familiar with the Simetrix version. It uses the generic PSPICE math' models produced by Berkley University but with it's own User Interface. Without having a good play with the package in front of me, I'm just stabbing in the dark.

Thanks for trying to help me out mate, I've asked my tutor but he says he's very busy just now and will get back to me when he has time. So i'm in study limbo just now.

If you're interested the software is free to download, but I'm not impressed with it one bit.

Hi uber,

Just to let you know I got to the bottom of this stupid thing. There is a fault with the simulation. Instead of using the "ideal transformer", I used an "ideal dc transformer" in the exact same circuit - straight away it works and it collaborates with the calculations I have been doing. I should have thought something was wrong when I found the wave being transformed into a cosine, that was very weird.

So, to sum - don't trust simulations 100%