Patent ID: 8554500
Filing Date: 2013-10-08
Classification: G01R

Abstract:
1. A system for detecting a ground fault or degraded isolation between a bus terminal and ground or a chassis reference on a vehicle, the system comprising: a first bus terminal isolated from ground and the chassis reference during normal operation of the vehicle; a second bus terminal isolated from ground and the chassis reference during normal operation of the vehicle; a first amplifier for receiving a first signal from the first bus terminal; a second amplifier for receiving a second signal from the second bus terminal; an inverter input of an inverter coupled to an output of the first amplifier; an analog-to-digital converter input of an analog-to-digital converter coupled to an inverter output of the inverter and an output of the second amplifier; and a data processor capable of receiving outputted digital data of the analog-to-digital converter, the data processor configured to apply a frequency domain transform to the digital data of the first bus terminal and the second bus terminal; the data processor identifying at least one of a circuit location of the ground fault or degraded isolation and a type of ground fault or degraded isolation based on the application of the frequency domain transform to the digital data.