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Lithium Ion, Lithium Poly Charger Circuit - The above circuit
will charge any 2-cell * Li-Ion battery pack. Maximum current is about 650
milliamps. The circuit is designed for batteries of 900mah or higher. Note
this circuit is NOT for Li-Metal batts (i.e. Duralites). Power source can
be a 12v Gell cell (Power panel), or can be powered by a car's cigarette
lighter. I use an old 12v DC wall transformer (800ma or more.) Radio shack
sells a 12v/1amp wall DC adapter #273-1776 that will work. Supply does not
need to be regulated. In fact my cheap supply outputs 17 volts with no
load. ….(Circuit design added 11/08)
Lithium-Ion Charger, Single cell - The LP2951 regulator is
manufactured by National Semiconductors. The choice of values is from an
application note "Battery Charging", written by Chester Simpson.
Diode D1 can be any diode from the 1N00x series, whichever is conveniently
available. It functions as a blocking diode, …. [Tony van Roon's circuit]
Optimizing High-Frequency Battery Charger Performance for Worldwide Applications -
07/06/00 EDN-Design Ideas Providing Power for electric vehicles for worldwide
use requires knowledge of energy conserving and high efficiency
technologies....[Design Idea added 5/02] EDN migrating links. This link is not
verified. Search the "title" EDN for new link.