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2. Functions
Simplified block schema of ARG Series Battery Charger with Battery Group is given at the below. ‘*’
marked functions are optional.
2.1. Rectification
Microcontroller controlled 2-thyristor / 2-diode full bridge rectifier circuit and input isolation transformer
is used for rectification.
DC load and battery charging is controlled separately. An L-C based low pass filter ensures low ripple
on DC output. Electronic current limiting limits output at I
n
, also protect the device by limiting current
and minimizing voltage in case of short-circuit at output. Output voltage, total current and battery
current limits are adjustable.
Cooling is ensured by proper passive cooling blocks and a digital temperature controlled fan. Fan is
supplied from AC input and controlled by microcontroller according to digital temperature sensor
measurement. Operating temperature is adjustable.
2.2. Battery Charging
Two charging modes are available. User is responsible to check battery specifications for floating and
equalizing charge limits if battery group is not montaged and wired by manufacturer or built-in.
Float Charge
Float charge mode compensates battery self-discharge and keep battery fully charged at maximum
capacity. Maximum charge current is 0.1C, ex. 2.6A for 26Ah, for most VRLA batteries.
Equalizing Charge
This mode brings all battery cells voltage at the same level at higher voltage by charging them with
higher current. Equalizing charge might remove sulfation on plates, thus makes battery capacity fully
available. Maximum charge current is 0.3C, ex. 7.8A for 26Ah, for most VRLA batteries.
