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

Claim 9:
10. A method for monitoring a high voltage electrical system in a vehicle using an interface circuit that provides isolation between a high voltage component of the vehicle and a control module, the method comprising:
receiving, at a field effect transistor of a high voltage constant current source, an input at a first voltage from the high voltage component;
receiving, at a Zener diode of a voltage threshold detector, an output from the field effect transistor, and outputting a signal to indicate whether the voltage of the high voltage component is at, or below, a desired voltage; and
receiving, at an opto-isolator of an electrical isolation circuit, the output signal from the Zener diode, decoupling, at the electrical isolation circuit, the output signal from the high voltage component and, in response to receiving the output signal from the Zener diode, outputting, at the opto-isolator, a signal at a second voltage to the control module.