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Old 17th April 2010, 05:50 AM   #51
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Quote:
Originally Posted by FELIBAR12 View Post
A lot of questions:
#Turns?
primary?
Secondary?
Etdxx?
awg?
tl494? or sg3525?
#Turns? Primary 25T 1X18#, Sec 14T 2X20# for +/- 75V~
Etdxx? EE42/42/20
tl494? or sg3525? SG 3525 + IR2110

Thanks
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Old 17th April 2010, 06:03 AM   #52
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Hi everybody,
I am not much expertise with SMPS. I have few questions:

1. Transformer data: 25T Primary, 14 T secondary on EE/42/42/20 core.
2. Zener used 62V between 0V & + secondary voltage.
3. rest is same as mahmood schematic.

Now according to mahmoods revised schematic, the volts per turn comes to be 4.666 ( 42/9T). So the 14T in secondary should give ~65V and therefore I put 62V zener.

But my SMPS is giving +/- 78volts and this drops to Around 76 volts on connecting a 1000W halogen. Thus the SMPS is regulating the load.

Why this is happening. I think the volts per turn is incorrectly mentioned as +/-42 in place of +/-50 in the revised schematic. because if we consider 50 volts out from 9 turns, we get 5.555 volts per turn (50/9T) and this gives 78 volts for 14T.

Even if we consider 5.55 V/T, second question: why the SMPS is regulating 78 volts when the zener is 62 Volts.

Please correct If I am wrong anywhere .

Eva, could you please throw some light?

Thanks
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Last edited by jash2008; 17th April 2010 at 06:12 AM.
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Old 17th April 2010, 06:15 AM   #53
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Few actual photographs of the two prototypes
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File Type: jpg DSCN2592.JPG (142.2 KB, 1810 views)
File Type: jpg DSCN2593.JPG (122.4 KB, 1751 views)
File Type: jpg DSCN2594.JPG (107.9 KB, 1700 views)
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Old 17th April 2010, 06:48 AM   #54
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Quote:
Originally Posted by Eva View Post
The negative output rail is not connected to the diodes properly either.
Hi EVA,

Will this schematic work. Please suggest no. of turns and wire guage for the driver transformer. This is a combination of mahmoods schematic & C Audio pulse series SMPS

Thanks
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Old 17th April 2010, 07:43 AM   #55
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Hi EVA,

c audio schematic
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Old 17th April 2010, 08:09 AM   #56
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Ur driving the MOSFETS as if they r transistors in this case IGBT
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Old 10th May 2010, 09:58 PM   #57
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better use an IR 2110, it is stable and reliable

best regards,
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Old 10th May 2010, 10:14 PM   #58
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Quote:
Originally Posted by savu View Post
better use an IR 2110, it is stable and reliable

best regards,


You tried that chip before?
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Old 11th May 2010, 03:32 AM   #59
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Quote:
Originally Posted by microsim444 View Post
You tried that chip before?
yes and it is quite stable.
the only problem is that you can't use it to paralel mosfets because it can drive max 2A.

best regards,
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Old 11th May 2010, 12:16 PM   #60
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Default Ir2110

Quote:
Originally Posted by savu View Post
yes and it is quite stable.
the only problem is that you can't use it to paralel mosfets because it can drive max 2A.

best regards,

Correct

Last edited by microsim444; 11th May 2010 at 12:25 PM.
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