On-board charger
32
Electrical system
Introduction of smart fortwo electric drive (3rd Generation) • Model Series 451
The on-board charger is located between the
drive unit and the rear end panel and converts the
alternating current of an external power supply
into direct current for charging the high voltage
battery. Integrated in the on-board charger is
the Powerline Gateway, which is required for
"Smart Charging".
As soon as an external power supply is connected
with a charging cable, the on-board charger
communicates with the control box in the charging
cable/charging station over a discrete control
line (Control Pilot). Here, the output data of the
charging infrastructure is transmitted and the
power consumption of the on-board charger is
adjusted accordingly. Only then does the on-
board charger initiate the charging process. In
the case of intelligent charging stations, addi-
tional communication takes place via the Power-
line Gateway on phase L1 and the neutral wire N.
Connections:
•High-voltage output (direct voltage)
• High-voltage input (AC voltage)
• 12 V on-board electrical system
• Control system (CAN)
• Coolant lines
Since the maximum possible charging current
depends on the charging cable or is determined
by the charging station, the smart fortwo electric
drive with both versions of the on-board charger
can be charged both at a household power outlet
or at a public charging station or wallbox (Smart
Charging).
The control unit of the on-board charger commu-
nicates with the battery management system
control unit and the drivetrain control unit over a
CAN connection.
P54.10-3681-00
Onboard charger 3 kW
1 Coolant circuit connections
2 Charge socket high-voltage connection
3 High-voltage on-board electrical system
high-voltage connection
4 12 V on-board electrical syst./CAN connector
N83 On-board charger 3kW
N83n1 Powerline Gateway
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