a single transistor smart battery charger

Posted on Feb 5, 2014

Electronic Design has a smart battery charger schematic using only a single transistor. This is interesting as similar circuits now contain simple integrated circuits. When the battery`s charge falls below a threshold voltage, it is automatically recharged to a preset voltage. Unfortunately, the circuit has a couple of major flaws. The single sili

a single transistor smart battery charger
Click here to download the full size of the above Circuit.

con junction makes the circuit extremely sensitive to ambient temperature changes. In the comments, someone mentions 0. 5V per 10 ° which sounds about right. For portable devices, you can avoid the second flaw by building the circuit into an external charger. However, this is not possible with UPS`s or other homemade backup power supplies.

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