+63/-63vdc Smps New Prototype

[CHACALPOWERS]

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

 

[guitar_joe]

looks alright

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

cheers

 

[luka]

Hi

Good good, every time better, more and more clean look! Yea how about performance? Full bridge?

 

[CHACALPOWERS]

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

 

[guitar_joe]

what switching frequency did you use?

 

[luka]

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...

 

[CHACALPOWERS]

Hi dears

The gate switching is 55Khz and my project is based in this schematics:
http://i186.photobucket.com/albums/x186/chacalpowers/SMPSIR2110.jpg

Thanks

Sandro

 

[CHACALPOWERS]

About the after gate trafo I use only 4R7 resistors less IN4148 or UF diodes.

 

[luka]

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.

 

[rordunez90]

can you share the schematics used on your project

 

[nigelwright7557]

Hi

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.

The IR doesn't do dead time so you would need to do it on the mosfet gates with diodes.