ISOLATION MEASUREMENT MONITORING FOR ASIL APPLICATIONS

The present invention refers to an electric circuit for monitoring isolation resistance measurement within the high voltage, HV, board net of an electronic vehicle and to a corresponding method for monitoring such an isolation resistance measurement.An electric circuit according to the invention comprises only a single amperemeter (Iiso_p or Iiso_n) permanently configured to measure either a positive current Iiso_p or a negative current Iiso_n through a respective measurement resistance (R0_p or R0_n) between a respective high voltage potential (HV+ or HV-) and a common ground potential (GND/Chassis). The respective actual measurement resistance value R'0_n or R'0_p of the unmeasured measurement resistance (R0_n or R0_p) is calculated applying a respectively calculated actual measurement resistance value R'0_p or R'0_n of the respective measured measurement resistance (R0_p or R0_n), a calculated actual positive isolation resistance value R'IsoP and a calculated negative isolation resistance value R'IsoP.