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: Electrical circuits, systems, methods, and/or computer program products that can facilitate isolation resistance monitoring for high voltage buses are addressed. In one example, a system can comprise an electrical circuit further comprising one or more resistors and a voltage meter which measures voltage, such that the voltage measurement assists with monitoring isolation resistance, simultaneously, for a smartcell system of an electric vehicle, and for a direct current (DC) charging source external to the electric vehicle.

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 energy monitoring system for discharging energy in an energy transfer device of a vehicle, including an isolation monitoring unit, a capacitor unit, a voltage terminal unit and a control unit. The voltage terminal unit is connectable to an energy storage system and transfers energy from the energy storage system to a vehicle subsystem. The isolation monitoring unit includes a first isolation resistor element and switch element. The resistor element is connectable to the voltage terminal unit via the switch element. The capacitor unit is connected to the voltage terminal unit and filters electromagnetic interference by storing energy during energy transfer to the subsystem. The control unit closes the first isolation switch element in case of a disconnection of the energy transfer to form a discharge circuit connecting the isolation monitoring unit and the capacitor unit. The discharge circuit discharges energy stored in the capacitor unit.