raff
New Member
Posts: 4
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Post by raff on Jan 26, 2009 23:20:35 GMT -8
hello and good day!  I wish to build the simple switching supply project.. BUT our mains here is rated 220VAC @ 60Hz.. what do I need to modify so I could run it at said mains voltage?? TIA |
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Post by lamazoid on Jan 27, 2009 6:49:57 GMT -8
And where's the circuit you wish to modify?
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raff
New Member
Posts: 4
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Post by raff on Jan 27, 2009 7:38:32 GMT -8
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Post by lamazoid on Jan 27, 2009 13:22:40 GMT -8
I'm confused with that. Why there is center tapped full-wave rectification on half-wave type circuit? and, what type is it: forward or flyback? transformer phasing is not shown.
I think it is easier to make such a low power supply using TOP ic's or similar.
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raff
New Member
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Post by raff on Jan 27, 2009 15:58:33 GMT -8
I wish the author would log-in soon...
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Post by kitbuilder on Jan 28, 2009 4:07:12 GMT -8
The circuit is designed with the more common 115 volts AC. Simply use a transformer with 220 VAC primary and 115 VAC secondary, to step your mains voltage down to the design voltage. Current requirements will depend on your intended use.
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rmeyn
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My primary interests are electronics, sailing, bowling, and camping
Posts: 163
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Post by rmeyn on Jan 28, 2009 8:51:06 GMT -8
Certainly it could be done. But does that not defeat the purpose of a switching regulator by introducing inefficiency?. Transformers are not all that efficient. I'm just beginning to study switching technology and I'm sure the circuit in question could be modified to accept a higher AC mains.
rmeyn
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Post by lamazoid on Jan 28, 2009 11:59:23 GMT -8
The circuit is designed with the more common 115 volts AC. Simply use a transformer with 220 VAC primary and 115 VAC secondary, to step your mains voltage down to the design voltage. Current requirements will depend on your intended use. LOL. raff Here in Russia we also have 220 volts. So i can help you to obtain certain schematics, and power supplies in particular. Just tell what specs PSU you need. |
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raff
New Member
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Post by raff on Jan 28, 2009 20:00:59 GMT -8
oh ok  we have same mains voltage... well, 1st off.. I would FIRST make the schema AS POSTED.. then if it works properly, I will upper the output voltage (and bipolar also, +/-25Vdc @ 2A or 3A)... of course with a bigger core and heavy gauge magnet wire circuit is simple and is VERY dependent on TURNS ratio... thats why I like it hehe |
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rmeyn
Full Member
My primary interests are electronics, sailing, bowling, and camping
Posts: 163
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Post by rmeyn on Jan 28, 2009 20:24:52 GMT -8
You're on the right track! I just wish I had the knowledge to help you out. I'm not quite there. Gary is having health problems at the moment and so he probably can't help immediately. We have electronic engineers in this forum. They need to step up! Oh, and don't forget to consider the increased voltage (PIV) on the diode bridge rectifier. They may need to be changed.
rmeyn
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we have same mains voltage... well, 1st off.. I would FIRST make the schema AS POSTED.. then if it works properly, I will upper the output voltage (and bipolar also, +/-25Vdc @ 2A or 3A)... of course with a bigger core and heavy gauge magnet wire