Method and apparatus for detecting leakage resistance in an elec

Details Method and apparatus for detecting leakage resistance in an elec Method and apparatus for detecting leakage resistance in an elec

1993-01-08

1995-01-17

Hofsass, Jeffery A.

Communications: electrical

Condition responsive indicating system

Specific condition

324510, 361 42, G08B 2100

Patent

active

053829468

ABSTRACT:
Provided is a method and circuit for measuring the leakage path resistance in an electric vehicle having an isolated high voltage traction battery and an auxiliary battery grounded to the vehicle. The circuit operates by periodically applying a selected excitation signal and comparing the voltage induced on an energy storage element by the excitation signal to a selected reference voltage during a selected time period. An alternate embodiment of the present invention provides a circuit which operates by applying a periodic excitation signal and comparing the phase shift of the voltage induced on an energy storage element to the phase shift of a signal derived from the excitation signal.

REFERENCES:
patent: 2991397 (1961-07-01), Place
patent: 3066284 (1962-11-01), McKinley et al.
patent: 3696367 (1972-10-01), Inamdar
patent: 3788646 (1974-01-01), Naito et al.
patent: 3975663 (1976-08-01), Moorey
patent: 4451823 (1984-05-01), Penn et al.
patent: 4638245 (1987-01-01), MacPhee et al.

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