High-voltage system and method for monitoring insulation faults in a high-voltage system

摘要

The invention relates to a high-voltage system (1) comprising a high-voltage battery (2) and a DC / DC converter (3), the high-voltage system (1) having two different galvanically connected voltage levels when the DC / DC converter (3) is active, whereby the high-voltage system (1) has a first measuring device (M1) for detecting the voltage of the high-voltage battery (2) and a second measuring device (M2) for detecting the voltage at the output of the DC / DC converter (3), the high-voltage system (1) has an insulation resistance measuring device (9), which is designed to carry out insulation resistance measurements only when the DC / DC converter (3) is deactivated, the high-voltage system (1) further comprising a third measuring device (M3) for detecting a voltage between a positive high-voltage line (7) and ground and a fourth measuring device (M4) for detecting a voltage between a negative high-voltage line (8) and ground, the high-voltage system (1) having an insulation monitor E has device (10) which is designed to monitor the insulation resistances from the data of the first to fourth measuring devices (M1-M4) at least when the DC / DC converter (3) is active, and a method for monitoring insulation faults.