Patent ID: 11860211
Assignee: FORD GLOBAL TECHNOLOGIES, LLC
Field: Measurement (Instruments)
Classification: CPC B  G | IPC B  G

Claim 0:
1. A system for monitoring a high voltage electrical system in a vehicle, the system comprising:
an interface circuit configured to provide isolation between a high voltage component of the vehicle and a control module, wherein the interface circuit comprises:
a high voltage constant current source comprising a field effect transistor configured to receive an input at a first voltage from the high voltage component;
a voltage threshold detector comprising a Zener diode, the Zener diode configured to receive an output from the field effect transistor and to output a signal to indicate whether the voltage of the high voltage component is at, or below, a desired voltage; and
an electrical isolation circuit comprising an opto-isolator, wherein:
the opto-isolator is configured to receive the output signal from the Zener diode;
the electrical isolation circuit is configured to decouple the output signal from the high voltage component; and
in response to receiving the output signal from the Zener diode, the opto-isolator is configured to output a signal at a second voltage to the control module.