A Circuit for charging NiCd, NiMH and Lithium-Ion Batteries.PWM 500kHz with Soft Start and Shutdown Control. The LT1510 can charge batteries ranging from 2V to 20V. Ground sensing of current is not required and the battery’s negative terminal can be tied directly to ground. A saturating switch running at 200kHz (500kHz for LT1510-5) giveshigh charging efficiency and small inductor size.
Uses MAX712/MAX713 fast charge controllers. PCB Design too. The only difference between them is the battery-fully-charged sensing method. The MAX713 is designed for NiCd batteries, while the 712 is for NiMh batteries.
Rechargeable AA cells are very popular for a large variety of
portable applications. The number of brands is also high, and the cell
quality can differ considerably. Cell capacity is sometimes different
from that specified, and the capacity often deteriorates dramatically
after a limited number of discharge cycles. ....
See Maxim Application Note - Simple Characterization Circuit for Rechargeable AA Cells
This characterization circuit, plus a PC and some software, accurately
measures the full discharge cycle for a rechargeable AA cell. Cell
capacity and output resistance can easily be determined from the curve
resulting from these measurements.
In Figure 1, the simple circuit is connected to the USB port of a PC. No
external power source is required because power is extracted from the
USB bus voltage. U1 (DS9490R) is a USB dongle that converts the USB
protocol to the 1-Wire® protocol, thereby allowing the PC to communicate
with the key circuit component (U2).