Patent ID: 11971443
Assignee: VOLVO CAR CORPORATION
Field: Transport (Mechanical engineering)
Classification: CPC B  G  H  Y | IPC B  G  H

Claim 12:
13. A method, comprising:
providing a non-isolated direct current to direct current (DC-DC) booster that boosts a first voltage of a charging station to a second voltage of a battery of an electric vehicle;
providing a first contactor on a positive connection and a second contactor on a negative connection;
coupling a first insulation monitoring device (IMD) of the electric vehicle to a second IMD of the charging station through the first contactor and the second contactor, the first IMD comprising a processor, an active symmetrization circuit, a resistor, and a switch that closes or opens to enable or disable the resistor;
determining, by the first IMD a difference between a third voltage of a negative side of insulation resistance of an electric vehicle supply equipment (EVSE) and a fourth voltage of a negative side of insulation resistance of the electric vehicle received from the second IMD; and
in response to determining the difference, balancing the third voltage to the fourth voltage by opening or closing the switch by the first IMD, wherein the first contactor and second contactor close after the third voltage matches the fourth voltage.