|Created||July 12, 2013|
|Last modified||July 14, 2013|
|Tags||joule-thief led lighting|
A novel circuit to charge a Li-ion battery from a 2v Solar cell
This circuit maximizes the output from a garden-light solar cell to charge a 3.7v Lithium-ion cell (or 3 NiMH cell in series).
Q3 switches the light on after dark and also acts as an over-charge safety by switching the LED on when the battery reaches full charge.
NOTE: The reversed polarities for the Solar cell and the Capacitor C1 is NOT a misprint! The circuit uses L1 to invert the polarity and boost the input to charge the Lithium cell.
No comments yet. Be the first!
Only the circuit's creator can access stored revision history.