|
Home > Archive > Electrical Engineering > March 2007 > I Need buck-boost 18volts@12 amp Converter
You are viewing an archived Text-only version of the thread.
To view this thread in it's original format and/or if you want to reply to
this thread please [click here]
| Author |
I Need buck-boost 18volts@12 amp Converter
|
|
|
| Hi Guys, I need to boost and regulate a cars power system from 11.5 v
(drained batt) to 15 volts input (max alt. charging), to a regulated 14~18
volts @ 10~12 amps, about 140~200 watts.
I cant find a schematic or design for more than 5 watts. The closest thing
I can think of would be a 100 watt Computer Laptop mobile power supply that
plugs into the cigeratte lighter.
I dont need tight regulation, 0.25 volt ripple is OK.
I'm hoping to build something for less than $15.
Any ideas? Thanks......
| |
| Palindrome 2007-03-20, 9:25 am |
| zz wrote:
> Hi Guys, I need to boost and regulate a cars power system from 11.5 v
> (drained batt) to 15 volts input (max alt. charging), to a regulated 14~18
> volts @ 10~12 amps, about 140~200 watts.
> I cant find a schematic or design for more than 5 watts. The closest thing
> I can think of would be a 100 watt Computer Laptop mobile power supply that
> plugs into the cigeratte lighter.
> I dont need tight regulation, 0.25 volt ripple is OK.
> I'm hoping to build something for less than $15.
> Any ideas? Thanks......
>
>
Can the output be floating, or does it need a common ground with the supply?
If floating:
Start with the circuit for a 12v 250W rms bridge audio/servo amplifier
and then drive it with a frequency of your choice. Take the output, full
wave rectify and smooth it and sample it to give a voltage to control
the frequency generator output amplitude.
If common ground:
Stick a 1:1 transformer with appropriate ratings between output and
rectifier.
--
Sue
| |
|
| Hi Sue, it's commom ground, thanks for the input. I dont think I can meet
my target price.
"Palindrome" <me9@privacy.net> wrote in message
news:qJOLh.59890$aL1.25960@fe12.news.easynews.com...
> zz wrote:
>
> Can the output be floating, or does it need a common ground with the
> supply?
>
> If floating:
>
> Start with the circuit for a 12v 250W rms bridge audio/servo amplifier and
> then drive it with a frequency of your choice. Take the output, full wave
> rectify and smooth it and sample it to give a voltage to control the
> frequency generator output amplitude.
>
> If common ground:
>
> Stick a 1:1 transformer with appropriate ratings between output and
> rectifier.
>
>
> --
> Sue
>
>
>
>
>
>
| |
| TimPerry 2007-03-21, 3:25 am |
| zz wrote:[color=darkred]
> Hi Sue, it's commom ground, thanks for the input. I dont think I can
> meet my target price.
>
> "Palindrome" <me9@privacy.net> wrote in message
> news:qJOLh.59890$aL1.25960@fe12.news.easynews.com...
how about a 6 volt golf cart battery with the negative going to the cars
+13.8? a stack of 10A or so diodes would drop the voltage down to desired
level
| |
|
|
|
|
|