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Old 25th August 2010, 05:34 AM   #11
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Join Date: Aug 2010
Hi E - folks,
Myself an hobby electronics, maki'g toys from scrap motors n etc.
From past 6 months I'm trying to develop some HB led ligts. Now I need to have a Power supply which can drive the LEDs from 220V AC mains.
I am trying to devlope some cheeapest smps for this purpose. I have downloded some app. notese of PWM ics, but I am not able to designe the Power Trasnformer for the voltage & current required.Can any one help me for the same Please.
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Old 25th August 2010, 12:30 PM   #12
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Join Date: Jul 2010
Location: Colorado
I think you need to find the schematic for the circuit this transformer was used in. Knowing the topology that it was designed for would save a lot of time in your design effort. The frequency that it was used at would be a big help. Also, if it was intended for a flyback circuit as an example, it can't be changed to a foward topology. You will still need to determine the turns ratios for all the secondary windings with respect to the primary, as that information is not usually on a schematic.

Winding a line frequency toroid would be an interresting project as an alternative. Very relaxing, sort of like basket weavng.
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