Regulating DC voltage to handle dips in voltage

C

CS

Guest
We have a 12V system similar to a car being charged at 14v. Anyway in the
system we have controlers that work well at 12 to 14 volts but if the
voltage for whatever reason ever drops below 12v the controler errors out
and has to be reset. What is the best way to guard against these brown outs
and could you direct me to a supplier. Forgive me if this sounds elementary
I have little to no working knowledge of electrical systems.

CS
 
CS wrote:
We have a 12V system similar to a car being charged at 14v. Anyway in the
system we have controlers that work well at 12 to 14 volts but if the
voltage for whatever reason ever drops below 12v the controler errors out
and has to be reset. What is the best way to guard against these brown outs
and could you direct me to a supplier. Forgive me if this sounds elementary
I have little to no working knowledge of electrical systems.

CS
Click to expand...
You need a controller that works down to 8VDC.
 
"CS" <C@S.COM> wrote in message news:2vesd5F2kdur3U1@uni-berlin.de...
We have a 12V system similar to a car being charged at 14v. Anyway in the
system we have controlers that work well at 12 to 14 volts but if the
voltage for whatever reason ever drops below 12v the controler errors out
and has to be reset. What is the best way to guard against these brown
outs
and could you direct me to a supplier. Forgive me if this sounds
elementary
I have little to no working knowledge of electrical systems.

CS
Click to expand...
you need a switch mode power supply that steps it up to 12 volts if it drops
below.
there are many control ics that will do almost all of it for you, you just
need a inductor and power transistor and a few R C etc.

some of the controlers have the power switch built in and have some realy
usefull circuit aplication ideas in their data sheets.

Colin =^.^=
 
On Wed, 10 Nov 2004 10:10:06 -0600, "CS" <C@S.COM> wrote:

We have a 12V system similar to a car being charged at 14v. Anyway in the
system we have controlers that work well at 12 to 14 volts but if the
voltage for whatever reason ever drops below 12v the controler errors out
and has to be reset. What is the best way to guard against these brown outs
and could you direct me to a supplier. Forgive me if this sounds elementary
I have little to no working knowledge of electrical systems.

CS


Hello CS,
Click to expand...
A small sealed lead acid battery may help you out
or a bank of ni-cad cells for a battery supply greater
than 12V.
Have a look here for the general idea, ignore the
transformer, look at the right hand side of the diagram.
http://phk.freebsd.dk/soekris/ups/
You could make it simpler still, with just two diodes
and a resistor selected to barely trickle charge the battery.

How much current does your controllers draw from
your supply? How often does the voltage on your
power supply dip below 12 Volts and for how long?

Regards,
John Crighton
Sydney
 
On Wed, 10 Nov 2004 10:10:06 -0600, "CS" <C@S.COM> wroth:

We have a 12V system similar to a car being charged at 14v. Anyway in the
system we have controlers that work well at 12 to 14 volts but if the
voltage for whatever reason ever drops below 12v the controler errors out
and has to be reset. What is the best way to guard against these brown outs
and could you direct me to a supplier. Forgive me if this sounds elementary
I have little to no working knowledge of electrical systems.

CS
Click to expand...
A completely off-the-shelf solution would be to buy a 12 to 24 volt DC
to DC converter and follow that with a 24 to 12 volt regulator. Use that just
to power the converter.

Jim
 
Thank you guys for your input. This seems like the simplest solution.
Unfortunately we also have to look at cost. It seems that the problem is
more likely to happen when the operators don't shutdown correctly or the
battery starts to go. I don't think there is a good way to deal with those
situations. Maybe the second battery but I think they are going to opt for
non-action. It is much cheaper than development. Thank you all for your
input

CS
"James Meyer" <jmeyer@nowhere.net> wrote in message
news:j2d5p0lls6teh67cdicdnft0kkkpthrtu0@4ax.com...
On Wed, 10 Nov 2004 10:10:06 -0600, "CS" <C@S.COM> wroth:

We have a 12V system similar to a car being charged at 14v. Anyway in
the
system we have controlers that work well at 12 to 14 volts but if the
voltage for whatever reason ever drops below 12v the controler errors out
and has to be reset. What is the best way to guard against these brown
outs
and could you direct me to a supplier. Forgive me if this sounds
elementary
I have little to no working knowledge of electrical systems.

CS


A completely off-the-shelf solution would be to buy a 12 to 24 volt DC
to DC converter and follow that with a 24 to 12 volt regulator. Use that
just
to power the converter.

Jim
Click to expand...
 
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