Subject: Re: Difference between AC adapter and charger?
Date: Fri, 18 Oct 2002 10:50:35 -0400
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References: <0001HW.B9D43FDF0325BBB11662EAD0@news.covad.net> <0001HW.B9D4EE870344BA681662EAD0@news.covad.net>
Serious battery manufacturers provide detailed application
notes on battery charging and even the many different
batteries - same technology - that have different discharge
and power providing characteristics. I believe one set of
well written app notes was panasonic.com
Battery charge limiting is more than just current limited
supplies. Battery temperature, voltage variations, etc are
all part to how different circuits are constructed. Special
consideration to rechargeable lithium batteries that can
explode in your face if not recharged with careful circuit
I convert all regular battery appliances to NiCd battery
operation. The AC adapter becomes both power source and
battery recharger by minor modifications such as adding a
schottky diode. Some appliances even have the whole already
in place for the diode. Therefore the NiCds recharge as the
radio or flashlight is also powered by an AC adapter or auto
> Thanks for your post.
> Is it simply a constant current source with no feedback, no
> sensing of the battery state?
> And the "really good ones", how is the voltage depression sensed?
> With the charger connected, and it is well-regulated, I'd > presume, wouldn't a depressed voltage be nigh inpossible to detect? Is the
> charger disconnected, regularly, and the battery state sensed?