In-circuit battery charger

Dec 14, 2004 2 Replies
R

I have a circuit that uses 1.5 volts (back up), provided I have a rechargeable battery... what other things do I need to consider if I wanted a in-circuit recharger circuit? anyone know or have any suggestions for schematics? what I have so far is....



1) The battery needs to be connected to a source at a higher potential like
2 V (at all times?? or should there be a trigger that will let in 2 V only after battery charge has dropped by a certain amount?) Thanks


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T

First thing you have to do is make sure the battery does not discharge through the charging circuit when the AC goes off. That means you have to charge it through a diode, and need something like 2.3V to drive, The actual voltage will depend on what kind of battery you have, and how fast you want to recharge.

Tam

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I

Chemistry of the battery (alkaline, ...). How fast do you want it recharged, minutes or days. How much are you willing to trade battery life for decreased complexity. Might it be easier just to stick a bigger 1.5V cell in.

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