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Old 4th June 2005, 07:03 PM   #1
venki is offline venki  India
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Angry need help new to smps power supply design

Hi,

I am trying to make an AMP a 3-way speaker system. Each speaker is driven by a 35W ampl. So the total power comes to about.210 watts. The voltage required is around +/-30 V. If i go for a comventional PSU it will cost me a lot.

By the way I am from india.

I would like to build a SMPS. But the problem is I dont know anything about it. Any SMPS gurus please help me out with design.

The power supply requirement is

+/- 30V
20A.

I would like to get info about how to build a transformer for the same. The dimensions etc. How to calculate it. Also since I am from india, will the parts be availble in india? (core etc).

Thanx in advance,
venki.
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Old 5th June 2005, 12:28 AM   #2
sss is offline sss  Israel
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yo , man this will be a verry difficult project
i think u should use a simple traffo
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Old 8th June 2005, 04:28 AM   #3
venki is offline venki  India
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Ok I think I am too ambitious I have brought down the current rating from 20A to 10A and voltage to +/- 25V (bcus i kicked our one IC from my design I am planning to go with passive crossovers instead of the active one.

Can anyone help me out now pleezzz...

Thanx,
Venki.
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Old 8th June 2005, 07:42 AM   #4
ghemink is offline ghemink  Netherlands
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Quote:
Originally posted by venki
Ok I think I am too ambitious I have brought down the current rating from 20A to 10A and voltage to +/- 25V (bcus i kicked our one IC from my design I am planning to go with passive crossovers instead of the active one.

Can anyone help me out now pleezzz...

Thanx,
Venki.

Don`t go for an SMPS, too much trouble and designing one from scratch is not easy, not cheap and dangerous (high voltages). Just get a normal conventional transformer, a diode bridge and a few caps.

Best regards

Gertjan
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Old 21st June 2005, 08:51 PM   #5
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hi there...wev'e been through this before......a disclaimer is that advice isn't given to anyone who hasn't grasped the dangers of going into the 1st time off-line smps deepend. Off-line designs or H.V work require a good oscilloscope and understanding what one sees......Start by doing something simpler.....i.e go linear......

richj
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Old 22nd June 2005, 02:02 AM   #6
Eva is offline Eva  Spain
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For powers up to 400W an AT or ATX PC power supply may be modified to do the job. However, this requires some knowledge about SMPS operation and SMPS transformer winding abilities.
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Old 22nd June 2005, 04:26 AM   #7
venki is offline venki  India
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Hello all,

thanx for the response. The problem with not going with the conventional design is that we dont get 10A transformers here. I will have to get it wound it will cost me a lot ( ). Eva I do know basics about SMPS I studied about this in my graduation. If any of you could give me some tips to modify the SMPS of PC it would be nice.

Thanx,

Venki
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Old 22nd June 2005, 09:28 AM   #8
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Default Re: need help new to smps power supply design

Quote:
Originally posted by venki
Hi,

I would like to build a SMPS. But the problem is I dont know anything about it. Any SMPS gurus please help me out with design.

venki.
Contradiction...... quote....."Eva I do know basics about SMPS I studied about this in my graduation".

I'm puzzled.....

richj
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Old 23rd June 2005, 12:45 PM   #9
aman is offline aman  India
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Default smps

hi venki,
i m aman from india living in delhi and interested in building amplifiers. My advice to u is that since building smps is very difficult u may go for the conventional psu. If u cant get a 10ampere transfromer then u can u can use two transformers of 5amp each for two channels (each three way system) and these are easily available in india.
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Old 24th June 2005, 09:10 AM   #10
venki is offline venki  India
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hi richwalters,

What i mean is that i just know the theory that is it but dont have any idea about the tranformers (mainly designing size other factors). Sorry about that I didnt mean to confuse you

aman about the 5 amps tranfomer i think it is a good alternative? i will have to check it out in our local store.

Thanx again to all..

venki
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