Analysis of ground fault currents in isolated and non-isolated charging modules in electric vehicles

The paper compares generic on board charger module (OBCM) topologies with respect to ground fault current detection and interruption. Ground fault current in isolated charging modules is very small due to the galvanic isolation between the input and output sides. In non-isolated charging modules, the paper shows the contributing components of the system to the generation of ground fault current. The ground fault current interrupt circuit is explained and compared in both topologies. Performance and parametric measures are used to compare the two topologies in MATLAB/Simulink.