[ltp] car and airplance adapter

[James Knott]

Peter Stuge wrote:
> On Sun, Nov 07, 2004 at 09:07:53AM -0500, James Knott wrote:
> 
>>Peter Stuge wrote:
>>
>>
>>>It's a pretty clever system where the voltage and current settings
>>>are stored in the power tips.
>>
>>A tually, there wouldn't be a current setting, as the current
>>required depends on the load, which changes during use.
> 
> 
> Right again, of course. I was thinking along the lines of a minimum
> expected current, to protect the adapter from overload, or a maximum
> current, to protect the laptop. But, as you wrote, if the adapter
> wasn't powerful enough it would just work at max capacity and the
> laptop would use the battery for the rest. I still think overcurrent
> protection could be useful though?
> 
> I'm glad I don't design power supplies for a living. ;) I'm not a
> star at analog electronics but I'm learning.

Almost any decent power supply, will have some sort of current limiting, 
even if it's just the internal resistance.  For example, many of those 
cheap, poorly regulated "wall warts" do that.