A question

MaXiZ · 13th August 2003, 09:47 PM

Is my idea totally wrong or is there something right?
Thanx in advance!

tsmith1315 · 14th August 2003, 05:45 AM

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

MaXiZ · 14th August 2003, 06:03 AM

Sorry now there's the right image!

MaXiZ · 14th August 2003, 06:05 AM

What mean r12,s?? And CT?
I'm a beginner sorry!

MaXiZ · 14th August 2003, 05:24 PM

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!

ANd i've tested that from pin 11 and 14 i've exactly the same voltage.. 10.1V AC

13th August 2003, 09:47 PM	#1
MaXiZ diyAudio Member Join Date: Jun 2003 Location: Italy	A question Is my idea totally wrong or is there something right? Thanx in advance!

14th August 2003, 06:03 AM	#3
MaXiZ diyAudio Member Join Date: Jun 2003 Location: Italy	Precisation Sorry now there's the right image!

14th August 2003, 05:24 PM	#5
MaXiZ diyAudio Member Join Date: Jun 2003 Location: Italy	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! ANd i've tested that from pin 11 and 14 i've exactly the same voltage.. 10.1V AC

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14th August 2003, 05:45 AM	#2
tsmith1315 diyAudio Member Join Date: Jul 2003 Location: Doerun, GA	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

14th August 2003, 06:05 AM	#4
MaXiZ diyAudio Member Join Date: Jun 2003 Location: Italy	What mean r12,s?? And CT? I'm a beginner sorry!

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