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-   -   A small help on a SMPS (http://www.diyaudio.com/forums/car-audio/17623-small-help-smps.html)

MaXiZ 12th July 2003 01:40 PM

A small help on a SMPS
 
I've build all the circuit my problem is on the transformer...
I've "destroyed" a burned transformer for 220AC to 12VDC (B) and naturally rewinded the "spin(??)". But with a tester i've at the output +6 instead of -37 and +20 instead of +37... The question's are:
1)Wrong type of winding? Should i rewind as a type A or B for this kind of application?

2)Is it suitable for this kind of application? Or MUST i use a type-A transformer?

3)Is it adaptable for this kind of application? For example by cutting the plastic fins(swings? Divider? i don't know the right word sorry! :P)

4)The buz11 become ver very hot. Don't checked but i think around 60C.. Is it normal?

Any comment will b very appreciated.. remember that i'm a beginner so don't talk much difficult! :)

http://web.tiscali.it/maxiz80/Image7.jpg

MaXiZ 13th July 2003 11:11 AM

additional info
 
sorry the image which i refer is this...
http://digilander.libero.it/Maxiz80/Image7.jpg

weinstro 19th July 2003 07:24 AM

SMPS response
 
It's not clear from the diagrams you've posted, how you're intending to use the transformer.

I'll assume that the SG3524 is going to either switch a power MOSFET, or switch the transformer coils directly. In the latter case, you won't get a whole lot of power out of this.

In either case, this might be using the wrong type of transformer. Normally, SMPS are switched at very high frequencies, >20kHz. At these frequencies, iron lamination based transformers don't work well, and typically ceramics or ferrites are used.

The websites of http://www.mag-inc.com and http://www.linear-tech.com are great websites with sufficient design and app notes to get you going.

Good luck,

Rob Weinstock

Hi Speed 1st August 2003 02:00 PM

Hi maxiz

maybe the next link help you http://www.eatel.net/~amptech/elecdisc/trnsfrmr.htm

Hi speed:)


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