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Old 13th August 2003, 09:47 PM   #1
MaXiZ is offline MaXiZ  Italy
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Default A question

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Is my idea totally wrong or is there something right?
Thanx in advance!
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Old 14th August 2003, 05:45 AM   #2
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Things to ponder...

What's R12's purpose? Its commonplace to tie the secondary CT to ground.

Given the output is significantly higher than what you were expecting, it sounds like the turns ratio is off a bit.

If the output isn't symmetrical with respect to the CT, are you sure it's really in the center? If so, it sounds like you don't have a good square waveform. I suppose a crippled rectifier could also cause asymmetricality, but certainly it would overheat to cause that much difference. Are the diodes fast enough to work at your switching frequency?

I don't know much about PWM controllers, but that looks like a heavy load for it to drive directly. Is the SG3524 capable of that much current?

Have you tried the circuit without regulation?

The big question: do you have a 'scope to snoop around with?

Tim
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Old 14th August 2003, 06:03 AM   #3
MaXiZ is offline MaXiZ  Italy
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Default Precisation

Sorry now there's the right image!
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Old 14th August 2003, 06:05 AM   #4
MaXiZ is offline MaXiZ  Italy
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What mean r12,s?? And CT?
I'm a beginner sorry!
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Old 14th August 2003, 05:24 PM   #5
MaXiZ is offline MaXiZ  Italy
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Default the diodes

And as diodes i've used 4 BYW29-50.
And these are the image on how i've wind the transformner... A tronsformer recovered from a burned PC Power Supply of 300W!
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ANd i've tested that from pin 11 and 14 i've exactly the same voltage.. 10.1V AC
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