Hello,
DC-DC Boost Converter Design not functioning properly, i couldnt pinpoint the problem and i have tried lots of stuff but i wasnt able to get Vout =24V.

 

Thanks in advance

 

Hi sdf,
Try this using a different MOSFET.
E

Note: look through this link for IRF640 problems.
https://forum.allaboutcircuits.com/threads/irf640-ltspice-model.191011/post-1787099

 

Your problem is with the diode model. I made a substitution, and the simulation works OK.
ETA: The MOSFET does not appear to have a problem. I also changed the rise and fall times on V2 to more realistic values.

 

Both of you, thank you so much. I have been trying to fix for last 12 hours :')

 

Both of you, thank you so much. I have been trying to fix for last 12 hours :')

No problem, and sorry for your agony, but I suggest you look at the LTspice Error Log (LTspiceXVII) or Output File (LTspiceXXIV) next time you have a problem. Use the Control Key and the letter L to make the output file/error log visible. You can also use the View menu.

 

The performance of a Boost-Converter is highly dependent upon
ALL of the specific details and the exact specifications of each component in the Circuit.

It's almost a waste of time to try modeling a Boost Converter,
the actual performance in the real-world will always be, at the very least,
somewhat different than the performance of the simulation.

Texas-Instruments provides a calculator service that
recommends specific-part-numbers for all of the various components,
and still, if You look at it crooked, the performance will change in some way.
It's just a matter of whether or not your design can tolerate the various quirks.

If You are expecting any kind of serious Power-Output,
I would recommend using a "Push-Pull" design with a Toroidal-Transformer-Output,
instead of a Boost-Converter design.
It will be far more stable and reliable, and
generate very little Electrical-Noise compared to the usual very-noisy Boost-Converter.
.
.
.

 

Hello,
DC-DC Boost Converter Design not functioning properly, i couldnt pinpoint the problem and i have tried lots of stuff but i wasnt able to get Vout =24V.
View attachment 323885
View attachment 323886

The diode used works well at 50, 60 Hz, at most 400 Hz. It cannot work at the frequency 60 kHz.

 

For those unfamiliar with diode modeling, parameter TT is related to the depletion layer capacitance and is described by one source as:

TT is an additional dynamic parameter, related to an additional​

capacitance component referred to as the stored-charge capacitance.​

I agree with Alex, that 173μF is a pretty big hump to overcome.