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Old 21st July 2008, 09:16 PM   #11
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hi mahmood

what is its power rating and can irfp450 be usedin place of 460
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Old 21st July 2008, 10:07 PM   #12
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I would suggest removing the linear PSU section for the controller - instead it may be better to have an inefficient regulator from the full-rail DC line (rectified mains) which is switched out once the output has stabilized (handed over to a regulated supply derived from the output - i.e. an additional winding).

This should up the overall efficiency once the output has stabilized.
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Old 21st July 2008, 10:07 PM   #13
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S.G. Mahbub,

What's wrong with the low voltage bias supply? Do you have a better solution that is more cost ($, space, weight, reliable) effective.

Rick
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Old 21st July 2008, 10:10 PM   #14
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Quote:
Originally posted by sawreyrw
S.G. Mahbub,

What's wrong with the low voltage bias supply? Do you have a better solution that is more cost ($, space, weight, reliable) effective.

Rick
See my above answer (posted a few moments before yours)
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Old 21st July 2008, 10:32 PM   #15
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annex666,

Good idea, but how well will it regulate? Do you need a series regulator in this case as well?

Let's see what S.G. Mahbub has to say. :-)

Rick
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Old 21st July 2008, 10:53 PM   #16
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Given the output is fixed, there should be minimal need to regulate the controller supply - maybe a low-dropout linear regulator, or even an LC filter will suffice. The controller is a low current device and probably doesn't have highly critical voltage supply requirements - I would check the datasheet and see what its requirements are, then judge what to do based on that.
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Old 22nd July 2008, 05:39 PM   #17
luka is offline luka  Slovenia
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Quote:
Originally posted by sawreyrw
annex666,

Good idea, but how well will it regulate? Do you need a series regulator in this case as well?

Let's see what S.G. Mahbub has to say. :-)

Rick
I have used 7812
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Old 18th August 2008, 02:43 AM   #18
LuigiDJ is offline LuigiDJ  Colombia
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Hello to all
Can this design be modified to work on 120Vac? My mains supply is 120 volts, and this smps is what I was looking for.
I have 3 etd59 cores, and want to make 2 active PA speakers, they will need 120volts ac on mains and +/- 65 or 70 volts dc, I'll need to change the turns ratio and the feedback network.
Any help on this?
Thanks
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Old 18th August 2008, 03:26 AM   #19
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What is its output current capability? How good is the line and load regulation?

Just the ticket for portable active PA speakers!!

Thanks for sharing.
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Old 18th August 2008, 11:20 PM   #20
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Quote:
Originally posted by LuigiDJ
Can this design be modified to work on 120Vac?
Easy, just use the voltage doubler trick you can find in any PC SMPS that has a 115/230V switch. I just clipped this out of the next best Google result:
Attached Images
File Type: jpg pc smps voltage doubler.jpg (21.7 KB, 4502 views)
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