PRE-CHARGE OF DC LINK CAPACITOR BY BIDIRECTIONAL HVLV_DCDC CONVERTER AND 12 V BATTERY

A method for operating an on-board HV charging system configured to charge a traction battery of an electric vehicle, the on-board HV charging system having a Power Factor Correction (PFC) circuit to convert AC power from a mains supply into DC power for use in charging the traction battery, a bi-directional High Voltage to High Voltage (HVHV) DCDC converter electrically coupled to the traction battery; a DC link capacitor electrically coupled between the PFC circuit and the HVHV DCDC converter; and a bi-directional High Voltage to Low Voltage (HVLV) DCDC converter electrically coupled between the traction battery and a 12 V battery. The method controls the PFC circuit, HVHV DCDC converter, in a reverse mode, and the HVLV DCDC converter, in a reverse mode, to pre-charge the DC link capacitor using electrical power from the 12 V battery.