Apparatus and method for performing high voltage impedance analysis and short circuit diagnosis for a vehicle

A method for performing a high voltage (HV) short circuit diagnosis and an impedance analysis for a vehicle, the method comprising:

• activating any number of switches during a pre-charge operation to power the HV power net;
• measuring a first voltage associated with a battery and a first current that varies based on the HV power net during the pre-charge operation;
• performing the short circuit diagnosis based on the first voltage and the first current during the pre-charge operation;
• determining a difference between the first voltage and a pre-charge voltage across one of a capacitor and the HV power net;
• measuring a second current based at least on the difference;
• and
• performing the impedance analysis for the vehicle based on the second current.

An apparatus for performing a high voltage (HV) short circuit diagnosis and an impedance analysis for a vehicle, the apparatus comprising:

• a controller configured to:
• measure a first voltage associated with a battery and a first current that varies based on a HV power net during a pre-charge operation;
• perform the short circuit diagnosis based on the first voltage and the first current during the pre-charge operation;
• determine a difference between the first voltage and a pre-charge voltage across one of a capacitor and the HV power net;
• measure a second current that varies based at least on the difference;
• and
• perform the impedance analysis for the vehicle based on the second current.