3
Terminology
Table 1-1 Terminology
Term Definition
AC
Alternating current
CCS
Combined Charging System; a standard charging method for
electric vehicles
CCU
Charging Control Unit; a control unit used to communicate with
BMS, and control the power delivery to the EV
CHAdeMO
Abbreviation of CHArge de Move; a standard charging
method for electric vehicles
DC
Direct current
ECU
Equipment Control Unit; a control unit used to handle the
system protection and the charging module control and
distribution
EV
Electric vehicle
OCPP
Open charge point protocol; open standard for communication
with charge stations
PE
Protective earth (ground)
RCBO
Residual current breaker with overload
RCD
Residual current device; a device that breaks an electrical
circuit when it detects a current leakage
RFID
Radio-frequency identification; a method of charging
authentication
SoC
State of charge; the level of charge of an electric battery relative
to its capacity. 0%=empty; 100%=full
SPD
Surge protection device; a device intended to protect electrical
devices from voltage spikes in AC circuits
TCU
Transaction Control Unit; intelligent hardware to handle the
human-machine interface, metering, transaction, and
communication with back office
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