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14 Current Calibration
14.1 What is current calibration
A simplified schedule for the regulation of the charging current is shown below Fig.14.1
The information about the charging current do you get by measuring the potential drop over the
resistor R421.
The potential drop over R421 is transformed in N450 to an analogue voltage, IMEAS.
Since the processor need the information in digital form, IMEAS has to pass trough an ADC in
N800 on the way to the processor.
This information lets the processor know how large the charging voltage is at the moment and
adjusts it using the digital control signal ICONT.
The signal ICONT is transformed to the signal CH_SW in N450 when the transistor V401 is
opened and closed.
The processor supervises the charging using IMEAS to be able to have the average charging
current at a constant level during the charging time.
For the adjusting to be exact you need to calibrate the charging current.
4/00021-3/FEA 209 544/18 B
Fig14.1
Trouble Shooting Guide, Advanced
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