Clint Sharp wrote:

In message , Michael A.
Terrell writes
All of my laptops have
been run in the car on inverters but I'd have to agree with another
poster, the most efficient way to do this is with a DC to DC converter.


The DC to DC converter is nothing more than the inverter & switching
power supply in the same case. The incoming DC is chopped, stepped up,
and regulated to the required voltage.
It's just a boost converter, there's no separate 'step up' stage
followed by a regulator. Can be done with a single IC but most of the
ones I've seen have been based on the MC34063 controlling a high current
MOSFET switch driving a toroid.


I've seen both types.


--
http://improve-usenet.org/index.html

aioe.org, Goggle Groups, and Web TV users must request to be white
listed, or I will not see your messages.

If you have broadband, your ISP may have a NNTP news server included in
your account: http://www.usenettools.net/ISP.htm


There are two kinds of people on this earth:
The crazy, and the insane.
The first sign of insanity is denying that you're crazy.