Abstract: An electric vehicle charging system is provided. In some embodiments, the electric vehicle charging system can comprise an electric vehicle comprising a direct current to direct current (DC-DC) booster that boosts a first voltage to a second voltage of a battery of the electric vehicle, and a first insulation monitoring device (IMD) comprising an active symmetrization circuit. In various embodiments, the electric vehicle charging system can further comprise an electric vehicle supply equipment comprising a second IMD and an output voltage comprising the first voltage, wherein the first IMD is communicatively coupled to the second IMD, and wherein the first IMD adjusts a third voltage on a negative side of insulation resistance of the electric vehicle to a fourth voltage on a negative side of insulation resistance of the electric vehicle supply equipment.

Abstract: A ground fault monitoring system includes an isolation monitoring unit, a first main switch, a second main switch and a control unit. The isolation monitoring unit is arrangeable between an energy storage system and a ground element. The switches are arrangeable between the energy storage system and an external energy supply system. The isolation monitoring unit includes a first, second and third switchable resistor branches. The control unit is configured to close the switches during charging of the energy storage system for connecting the energy storage system to the external energy supply system and to disconnect the first switchable resistor branch from the energy storage system and connect the second switchable resistor branch and the third switchable resistor branch to the energy storage system for monitoring a current leakage to the ground element during charging of the energy storage system.

Abstract: A ground fault monitoring system includes an isolation monitoring unit, a first main switch, a second main switch and a control unit. The isolation monitoring unit is arrangeable between an energy storage system and a ground element. The switches are arrangeable between the energy storage system and an external energy supply system. The isolation monitoring unit includes a first, second and third switchable resistor branches. The control unit is configured to close the switches during charging of the energy storage system for connecting the energy storage system to the external energy supply system and to disconnect the first switchable resistor branch from the energy storage system and connect the second switchable resistor branch and the third switchable resistor branch to the energy storage system for monitoring a current leakage to the ground element during charging of the energy storage system.

Abstract: An electric vehicle charging system is provided. In some embodiments, the electric vehicle charging system can comprise an electric vehicle comprising a direct current to direct current (DC-DC) booster that boosts a first voltage to a second voltage of a battery of the electric vehicle, and a first insulation monitoring device (IMD) comprising an active symmetrization circuit. In various embodiments, the electric vehicle charging system can further comprise an electric vehicle supply equipment comprising a second IMD and an output voltage comprising the first voltage, wherein the first IMD is communicatively coupled to the second IMD, and wherein the first IMD adjusts a third voltage on a negative side of insulation resistance of the electric vehicle to a fourth voltage on a negative side of insulation resistance of the electric vehicle supply equipment.