North Weber and Baugh LLP
Isolation impedance measuring system and method using fourier transform and component value self calibration
Embodiments of the present invention disclose methods and systems in a vehicle having high voltage (HV) for measuring isolation impedance in an EV or HEV utilizing an AC impedance measurement system. The method utilizes an extraction algorithm based on a Fourier transform to calculate phase and amplitude and then utilizes the calculated phase and amplitude to determine the isolation impedance. The isolation impedance comprises leakage resistance and total capacitance that are coupled in parallel between the high voltage system and the chassis. Embodiments of the present invention also provide a method and systems for component value self-calibration.
MAXIM INTEGRATED PRODUCTS, INC.
G G G G G
G06F G01R G01R G01R G01R
inventional inventional inventional inventional inventional
Jiangang Jason Allen
Liu Wortham