Subject: Re: How to making AC to DC converter ?
Date: Wed, 16 Oct 2002 01:59:30 -0700
X-Mailer: Mozilla 4.78 [en] (Win98; U)
Bob Wilson wrote:
> In article ,
> firstname.lastname@example.org says...
> >I want to make "AC to DC converter", if possible without transformer
> >in order to avoid harmonics in transformer. I want this converter have
> >specification as follows :
> >+) Input AC with :
> > -) Voltage range : 90 - 300 volts
> > -) Frequency range : 40 - 70 Hz
> >+) Output DC with voltage 12 volts
> >+) Output power 450 watts or 700 VA
> >+) I want the output of this converter also have filter (maybe an
> >active filter) to eliminate noise and ripple from the voltage
> > Because that, i ask yours help. If you have circuit diagram and PCB
> >layout for this converter, please send to me (Irsyadoel@yahoo.com)and
> >also include the list of components that use in the circuit.
> > For your attention and help, i say thanks.
> Without a transformer?? The only possible way is using a buck or similar
> non-isolated switchode topology, but this would be totally senseless for the
> large ratio of input to output voltage ratio you want (the duty cycle would
> be razor-narrow and very hard to control). But if you think a normal AC
> transformer has "harmonics", just wait 'til you look at the output of a
> switchmode power supply!
> By the way, what is it that you want, anyway? 400 "Watts" or 700 VA? Output
> is rated in VA in any case (not Watts, since there is no power *consumed* at
> the output), so this is more than a little confusing. You cannot have both
> 400W and 700VA at the same time!
> You are also way off base with the suggestion of using an active filter at
> 400 Watts. Active filtes are used in low signal applications, not in high
> power circuits (how are you going to run 400 Watts through a series of
That was my first impression....but....isn't a linear regulator just an active
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