Nickel Metal Hydride Battery
Charger Two
Stage Voltage
E.D.S. offers a fully controlled two stage voltage charger designed
to properly return capacity to a nickel metal hydride battery without fear of
overcharge. This product is offered to be an affordable option for controlled
NiMH battery charging where the use of a thermistor in the battery is not possible.
There is no thermal monitoring or feedback involved in this chargers operation.
The battery end-of-charge voltage is a fixed voltage based around a fixed volts/cell.
Each charger is equipped with an LED, which indicates charge status. Note: A battery
is required by E.D.S. in order to test and sample this unit.
This charger has two distinct states throughout
the charge of the battery as follows: State 1 The charger
is in a high constant current state, the value of which is based on client requirements
and the battery pack capacity. The red LED will be fully illuminated in this state.
State 2 Upon reaching the end-of-charge voltage, the charger goes
into a constant current C/15 maintenance charge. This charge is designed to keep
battery "topped off" and prevent the charger from going back into the
high rate. The red LED will go out in this state.
The charge data below illustrates the typical operation of the two stage
voltage charger
