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Old 25th May 2012, 12:20 PM   #1
diyAudio Member
Join Date: May 2012
Default LTspice simulation

I am designing a 1.5 KW power supply and 1000 volt output .input is 50V DC.Now I am designing the circuit in LTspice . But I can't get the desired output. I think that my circuit has some problems. can anybody help me to correct it?
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Old 25th May 2012, 12:51 PM   #2
PChi is offline PChi  United Kingdom
diyAudio Member
Join Date: Jan 2012
Location: Staines, UK
Some comments on the circuit are:-

At 1000 W at 50 V the input current = 20 A. I don't know why R21 to R24 are included which are shown as 1 ohm.

Any imbalance in the pulse widths causes a DC current through the transformer which could be a problem in a real circuit. Sometimes fixed by adding a series capacitor or using a current mode control IC.

The sensing feedback is connected to the rectifier diode side of the inductor. I would have expected it to be connected to C1.

The TL431 is a cheap and dirty feedback error amplifier but gives limited flexibility in seting the frequency compensation.

C1 is a low value. It that correct?
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Old 28th May 2012, 03:02 PM   #3
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Join Date: May 2012
I corrected the scematic and I got the desired result. What suggestions do you have to be more complete circuit?
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Last edited by 8409513; 28th May 2012 at 03:18 PM.
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