[ltp] self-made external battery for laptops project

[Richard Neill]

BOTHER! That first diode is upside down !

I-D-ten-T error on my part - sorry.

Richard





Thomas Hood wrote:
> On Fri, 2002-04-19 at 22:20, Richard Neill wrote:
> 
>>I would recommend you add the following to your protection circuit:
>>
>>INPUT +                                                  OUTPUT +
>>
>>0--------[--X--]------+------------+-----------+-----------0
>>                       |            |           |
>>           fuse        |            |           |
>>                       |      zener |           |
>>                       |            |   /       |
>>                     __|__       /-----/     _______ +
>>                     \   /      /  / \                 capacitor
>>              diode   \ /         /   \      _______
>>                     -----        -----         |
>>                       |            |           |
>>                       |            |           |
>>                       |            |           |
>>                       |            |           |
>>                       |            |           |
>>0---------------------+------------+-----------+-----------0
>>INPUT GND                                               OUTPUT GND
>>
>>
>>The diode is there to prevent against reverse polarity.
> 
> 
> Erm.  The first diode shouldn't be there.  Either that or
> the "fuse" element should be labelled 'cigarette lighter'.
> 
> 
> 
>>The zener is rated at a little over the voltage you expect to supply to 
>>your laptop. It will help with surges and over-voltages. Again, in 
>>normal use, it should not conduct, and the aim is to protect the laptop 
>>by crowbar-ing the supply for long enough that the fuse will blow.
> 
> 
> You might want to stick a MOV in there too.
> 
> --
> Thomas Hood
> 
> 
> 
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