I Need buck-boost 18volts@12 amp Converter

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.

Reply to
Palindrome
Loading thread data ...

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......

Reply to
zz

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
Reply to
TimPerry

Here follows a link to a design for a +11V to 14.3V Input to 16V at 70 Watts (4.4A):

formatting link
Maxim provide a wide range of completed design exercises ("cookbook"):

formatting link
Plus application notes:

formatting link
Feeding the Max668 partnumber in will give you all the information you need to modify the circuit for 200W output and design a unit:

formatting link

However, it can be done by paralleling up the inductor, switch and rectifier components and increasing the capacitor bank. This will probably be a lot cheaper than sourcing the inductor needed for 200W in one go.

Reply to
Palindrome

PolyTech Forum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.