12 volt to 12 volt regulated Power Supply

[David]

Hi,

I am new to this newsgroup, so please bear with me.

I am trying to get a design for a 12 volt DC to 12 volt DC regulated power
supply. The design is to provide 12 volts DC + or - 5% output from an input
of between 8 volts and 16 volts DC.
The purpose of this is to run a computer in a sail boat. The battery voltage
in the boat may vary from 8 volts to 16 volts when it is charging.

I currently have an ATX computer power supply that runs off 12 volts DC, it
provides 3 and 5 volts nicely, but the 12 volt rail is actually the input
voltage. So, when the input is 12 volts all is well, if it goes high, well
that could be a real problem, and if it goes low, the computer will shut
down. If you can help it would be much appreciated.

 

[KoRRupT]

Hi,

I am new to this newsgroup, so please bear with me.

I am trying to get a design for a 12 volt DC to 12 volt DC regulated power
supply. The design is to provide 12 volts DC + or - 5% output from an input
of between 8 volts and 16 volts DC.
The purpose of this is to run a computer in a sail boat. The battery voltage
in the boat may vary from 8 volts to 16 volts when it is charging.

I currently have an ATX computer power supply that runs off 12 volts DC, it
provides 3 and 5 volts nicely, but the 12 volt rail is actually the input
voltage. So, when the input is 12 volts all is well, if it goes high, well
that could be a real problem, and if it goes low, the computer will shut
down. If you can help it would be much appreciated.

Probably don't need to design a 12V-12V dc/dc converter as there are plenty
of dc/dc converters around. One place to start looking is www.amtex.com.au.
They are a bit pricey, but definitely top quality stuff.

I'm not sure what the power requirements for the 12V rail would be in an ATX
PC... but one model I've used in the past was the FDC60 series from Amtex.
9-18V input, 12V/5A +/-1% output (FDC60 - 12S12). Very pricey for small qty,
but definitely sweet.

 

[David Tuff]

Thanks for that, I will give them a call and see what the price is...
Regards,

David.

 

[Derek Weston]

I am trying to get a design for a 12 volt DC to 12 volt DC regulated power
supply. The design is to provide 12 volts DC + or - 5% output from an input
of between 8 volts and 16 volts DC.
The purpose of this is to run a computer in a sail boat. The battery voltage
in the boat may vary from 8 volts to 16 volts when it is charging.

I currently have an ATX computer power supply that runs off 12 volts DC, it
provides 3 and 5 volts nicely, but the 12 volt rail is actually the input
voltage. So, when the input is 12 volts all is well, if it goes high, well
that could be a real problem, and if it goes low, the computer will shut
down. If you can help it would be much appreciated.

Have a look at the Mk 2.5 at http://www.sproggy.freeserve.co.uk/psu.html

Its not exactly what you want, but perhaps it can be a source of ideas
for you.

 

[Rod Speed]

You're generally better to cut to the
chase and use a laptop in that situation.

 

[David]

Been there, I still use the laptop as a backup. So far, the commercial unit
available from AMTEX looks good, but I still would like a design I can build
myself.

David.

 

[Mike Warren]

Been there, I still use the laptop as a backup. So far, the
commercial unit available from AMTEX looks good,
but I still would like a design I can build myself.

If you are after a complete 12V ATX supply design I can probably help.

I designed one about 12 months ago. PCB is about 5 x 6 inches.

-Mike

 

[David]

Mike,

That would be great. How can I get to look at the design?

David.

 

[Mike Warren]

That would be great. How can I get to look at the design?

Replied by email.

-Mike