DCW20
User Manual rev. 5
Page 10/34
Time
Current
Voltage
Constant current
Constant voltage
Maintenance
Charge current
Charge voltage
Figure 6: Nickel charging algorithm
For Supercapacitor after the constant current phase the algorithm goes directly to maintenance
keeping the vo
ltage at “
Battery charge voltage
”.
Time
Current
Voltage
Constant current
Maintenance
Charge current
Charge voltage
Figure 7: Supercapacitors charging algorithm
Warning: In order to avoid potentially hazardous situations including fire hazard, safety
recommendations must be followed. Only authorized staff can install the unit.
Warning: For Lithium cells the balancing and protection circuit must be included in the
battery pack.
For Nickel batteries the use of the external temperature sensor is mandatory. The sensor
must be placed in contact with the battery.
3.1.4 Coulomb counter
DCW20 measures the current flowing from / to the battery to keep track of the capacity available on
the battery. The capacity is measured in Ampere Hour [Ah]. The value shown is based on the
following assumptions:
The value shown is just informative and does not represent the real state of charge of the
battery in some circumstances, for example if the battery is damaged.
When the battery is connected for the first time or the system starts from OFF, the system
assumes the battery is fully discharged and start with 0Ah counter.
Once the battery is fully charged the system sets the counter to the nominal capacity
specified by the user (§4.2.12).
DCW20_040-02-700-005-EH-1117