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Old 2nd August 2008, 12:07 AM   #1
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Default +63/-63vdc Smps New Prototype

Hello SMPS builders and friends

This is my new SMPS for power amp aplication.
I like it but I will build a control current togheter

Thank you very much

Sandro
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Old 2nd August 2008, 03:51 AM   #2
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looks alright

can you say anything about how it performs though?
power, ripple, stability... that kind of stuff.

cheers
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Old 2nd August 2008, 11:58 AM   #3
luka is offline luka  Slovenia
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Hi

Good good, every time better, more and more clean look! Yea how about performance? Full bridge?
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Old 3rd August 2008, 02:43 AM   #4
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Hi guitar joe and luka

Great stability, very fine. It's a SG3525/2 inch. core/4 X IRGPC30U/ half bridge SMPS project. In the start, I built it with IR2110 but I don't understand, the IGBTs stay very hot no load and the IR2110 explode after few minuts. Now, I get out the IR2110 and built a small core driver. Very good enjoy because the IGBTs stay "ice" and no fan is necessary in hard load.

Thanks by your comments.

Sandro
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Old 3rd August 2008, 04:03 AM   #5
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what switching frequency did you use?
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Old 3rd August 2008, 08:13 AM   #6
luka is offline luka  Slovenia
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Hi

Also, after gate trafo, did you use any fast turn off circuit, or just resistor/diode?
If you have schema with IR, send it to me, will take a look and try to find why it did get hot and died...
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Old 3rd August 2008, 04:58 PM   #7
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Hi dears

The gate switching is 55Khz and my project is based in this schematics:
http://i186.photobucket.com/albums/x...SMPSIR2110.jpg

Thanks

Sandro
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Old 3rd August 2008, 05:19 PM   #8
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About the after gate trafo I use only 4R7 resistors less IN4148 or UF diodes.
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Old 3rd August 2008, 05:28 PM   #9
luka is offline luka  Slovenia
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Hi

It looks ok, maybe a bit too low R value, I would use 22R, practical is somewhere from 10R to 100R

Supply wasn't a problem because you have used 50Hz trafo, so voltage was ok.
Bad layout? But even so, I really don't know how you could make it that bad that IR would heat up and die.
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