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Old 24th July 2007, 02:57 AM   #1
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Default 12V CT push-pull series secondaries

this is the test circuit that Im making
-SG3524
-trying current pulse limit (refered on other thread, from Bob Blick circuit)
-trafos are 2X EI33 from AT PSU (inductance measured for test)
each:
PRI= 7+7 turns
SEC = 20+20 turns

40KHz
regulated at +-44V

Is it aparently correct?

thanks!!
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Old 24th July 2007, 03:00 AM   #2
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second part of image
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Old 24th July 2007, 03:42 AM   #3
mzzj is offline mzzj  Finland
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Your drawing style gives me headache
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Old 24th July 2007, 04:05 AM   #4
star882 is offline star882  United States
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Swap the halves of the secondaries on the transformers so if there's an unbalanced load, it would not make an asymmetrical load on the transformers and require them to be derated. (In other words, make each side of the rectifier connect to a secondary on each transformer.)
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Old 24th July 2007, 01:53 PM   #5
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sorry about draw

secondaries of each single trafo is conected, im draw this wrong

each leg of each full-wave rectifier is on one extreme of series secondarie
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Old 24th July 2007, 05:22 PM   #6
star882 is offline star882  United States
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Quote:
Originally posted by eltonseemann
sorry about draw

secondaries of each single trafo is conected, im draw this wrong

each leg of each full-wave rectifier is on one extreme of series secondarie
Consider what each transformer would see as load if one of the outputs is loaded more than the other. It would become asymmetrical and cause problems.
Connect one transformer with a center tap and split the other transformer so each secondary is in series with each end of the other transformer.
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Old 24th July 2007, 05:52 PM   #7
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OK
I understand now. Thanks, I will change this

My tests are not good, voltage rises on load. Go to +-26V at 1A simetrical.

I change CT to 10nF for more deadtime on sg3524
Fosc= 33.3KHz
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Old 24th July 2007, 06:02 PM   #8
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Default new secondarie

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Old 24th July 2007, 07:17 PM   #9
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I route new secondarie on same board but results are the same.

load will be audio amplifiers (symetric)
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Old 25th July 2007, 06:10 PM   #10
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Default PCB broke track

This morning I did find an stupid error on pcb. One colector at sg3524 are not at 12V (broke track at pin 12). The converter was playing on only one leg . capable of 50W load

Now results are more satisfactory

Im working on current limit, this work well.
I impement an idea found on other thead, thanks Eva, rectifying primary legs to supply driver circuit
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