Measuring isolated high voltage and detecting isolation breakdown with measures for self-detection of circuit faults

A system for measuring a voltage of a battery pack and a detecting of an isolation fault, the system comprising:

• a plurality of resistive elements;
• a plurality of switches connected to the plurality of resistive elements;
• and
• a controller configured to control the plurality of switches to operate in first mode to measure the voltage of the battery pack based on a signal produced by coupling the plurality of resistive elements to the battery pack in a first configuration, and to control the plurality of switches to operate in at least a second mode to detect an isolation fault based on a signal produced by coupling the plurality of resistive elements to the battery pack in at least a second configuration.

A system for measuring a magnitude of an isolation fault from a battery pack, the system comprising:

• a first resistive divider comprising at least a first resistive element and a second resistive element;
• a second resistive divider comprising the second resistive element and a third resistive element;
• a plurality of switches coupled between the second resistive element and the battery pack;
• and
• a controller configured to control the plurality of switches to operate in a first mode to make a first measurement using the first resistive divider, to make a second measurement using the second resistive divider, and to determine a magnitude of the isolation fault based on the first and second measurements.