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Signal/Control port with symmetric lines
An asymmetric artificial network (AAN) to be connected between the vehicle and the charging station or any associated equipment (AE) used to simulate communication is defined in CISPR 16-1-2 Annex E clause E.2 (T network circuit) (see example in Figure 8).
The AAN has a common mode impedance of 150 Ω. The impedance Zcat adjusts the symmetry of the cabling and attached periphery typically expressed as longitudinal conversion loss (LCL). The value of LCL should be predetermined by measurements or be defined by the manufacturer of the charging station/charging harness. The selected value for LCL and its origin shall be stated in the test report.
CAN communication is an example of symmetric lines used for vehicle DC charging mode.
If an original charging station can be used for the test, an AAN is not required for CAN communication.
If the CAN communication is emulated and if the presence of the AAN prevents proper CAN communication, then no AAN should be used.
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