Proteus error: Time step too small - Buck converter - When the switching frequency is high.

Ian Rogers

Joined Dec 12, 2012
774
Some of your primitives ( capacitors ) are there for visual properties... You will need to change them.. You can also change the timestep in "Simulator options" This will pull you away from "Real Time" so the simulation can be calculated...

Also turn off all animation properties..
 

Ian Rogers

Joined Dec 12, 2012
774
Remember that without purchasing the "Advanced Simulation Features" Proteus is not the best at analysing circuits... This will be much easier using LT spice...
 

Ian Rogers

Joined Dec 12, 2012
774
Can you post the complete schematic?? Did you download this from the net??

I have just run this in Proteus... 25% = 1.30V.. 50% = 3.3V.. 75% = 5.9V... 90% = 6.61V
Is this what you expected....
 
Last edited:

Ian Rogers

Joined Dec 12, 2012
774
One other thing.. The bootstrap caps and Vs need to be at the bottom of the FET!! Now I get the full 0V ~ 44v.. 50% = 23.2V.. 90% = 44v

upload_2019-3-30_9-27-49.png
 

Thread Starter

lehieubk98

Joined Mar 29, 2019
27
This is the circuit I just crested and it ran well, I don't know why the previous circuit didn't.
But Vout=46.7V and it must be 12V because D=25%. I can't see why did it go wrong like that.
 

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