Darren --
The choice of SMPS topology and device will depend to a large part on the
rectified voltage across the filter.
which will be about 170 VDC in the US or twice that for Declan in Ireland.
Direct off-the-line switchers are common place. (As in about every PC in
the world). Armed with your filtered DC level I suggest going to the
following IC suppliers and search for suitable SMPS controllers.
TI Linear Tech Maxim for starters, there are others.
Finding a direct IC buck converter may be a bit difficult due to the high
voltage. The normal approach to this is to build a flyback converter
(ugh!!, transformer required :-( ) using a regular SMPS controller IC and an
external switching FET and flyback diode. (See www.irf.com)
Also, try an "off-the-shelf" "Universal Input" power supply. See
www.astrodyne.com ).
Depending on what kind of nonsense you are up to you may even be able to use
a cheap PC power supply. I think they are mostly "off-the-line" switchers
and may take DC inputs. You would have to check.
Bob Smith
--- Avoid computer viruses, Practice safe hex ---
-- Specializing in small, cost effective
embedded control systems --
http://www.smithmachineworks.com/embedprod.html
Robert L. (Bob) Smith
Smith Machine Works, Inc.
9900 Lumlay Road
Richmond, VA 23236 804/745-1065
[EMAIL PROTECTED]
----- Original Message -----
To: "Multiple recipients of list CHIPDIR-L" <[EMAIL PROTECTED]>
Sent: Thursday, December 18, 2003 9:09 AM
> Hello,
>
> Thanks Bob, any suggestions on the switcher (capable of rectified mains)?
>
> -----Original Message-----
> Sent: 18 December 2003 13:44
> To: Multiple recipients of list CHIPDIR-L
>
>
> No need for detection. Do it the normal way.
>
> Input terminals go to a bridge rectifier with an output filter capacitor.
> Any common buck converter takes output of filter capacitor and converts to
> 12 volts.
>
> No need for detection. The bridge passes DC directly and converts AC to
DC.
> It also is also not sensitive to reverse polarity when connected to DC.
>
> Have fun, Bob Smith
>
>
> --- Avoid computer viruses, Practice safe hex ---
>
> -- Specializing in small, cost effective
> embedded control systems --
>
> http://www.smithmachineworks.com/embedprod.html
>
>
> Robert L. (Bob) Smith
> Smith Machine Works, Inc.
> 9900 Lumlay Road
> Richmond, VA 23236 804/745-1065
>
> [EMAIL PROTECTED]
>
> ----- Original Message -----
> To: "Multiple recipients of list CHIPDIR-L" <[EMAIL PROTECTED]>
> Sent: Thursday, December 18, 2003 4:54 AM
>
>
> > Hello,
> >
> > Does anybody have any idea how one can go about designing a power supply
> > which can run from AC mains or DC - automatically switching itself for
> > either input. For example 90-260V AC and 8 to 24V DC (output 12V, 1A)?
> >
> > I guess there will be some kind of front end detection circuit (of AC or
> DC)
> > which controls how the input is converted.
> >
> > Best regards
> > Darren Logan BSc(Hons)
> > Development Engineer
> > ________________________________________________________________
> > MICHELL INSTRUMENTS LTD Tel: +44 (0)1223 434 854
> > Nuffield Close Fax: +44 (0)1223 434 895
> > Cambridge e-mail: [EMAIL PROTECTED]
> > CB4 1SS, UK web: www.michell-instruments.com
> > UKAS accredited: 0179 * ISO9002 accredited: Q6284 * Member BCAS *
Investor
> > in People
> > --------------------------------- Dew point specialists
> > ---------------------------------
> > This communication contains information which is confidential and may
also
> > be privileged. It
> > is for the exclusive use of the intended recipient(s). If you are not
the
> > intended recipient(s),
> > please note that any distribution, copying or use of this communication
or
> > the information in
> > it is strictly prohibited. If you have received this communication in
> error,
> > please notify the
> > sender immediately and then destroy any copies of it.
> >
> >
> > --
> > Author: Darren Logan
> > INET: [EMAIL PROTECTED]
> >
> > Fat City Network Services -- 858-538-5051 http://www.fatcity.com
> > San Diego, California -- Mailing list and web hosting services
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>
>
> --
> Author: Robert Smith
> INET: [EMAIL PROTECTED]
>
> Fat City Network Services -- 858-538-5051 http://www.fatcity.com
> San Diego, California -- Mailing list and web hosting services
> ---------------------------------------------------------------------
> To REMOVE yourself from this mailing list, send an E-Mail message
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> also send the HELP command for other information (like subscribing).
> --
> Author: Darren Logan
> INET: [EMAIL PROTECTED]
>
> Fat City Network Services -- 858-538-5051 http://www.fatcity.com
> San Diego, California -- Mailing list and web hosting services
> ---------------------------------------------------------------------
> To REMOVE yourself from this mailing list, send an E-Mail message
> to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in
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> also send the HELP command for other information (like subscribing).
>
--
Author: Robert Smith
INET: [EMAIL PROTECTED]
Fat City Network Services -- 858-538-5051 http://www.fatcity.com
San Diego, California -- Mailing list and web hosting services
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