Ground fault detector for an inverter and a method therefor

Details Ground fault detector for an inverter and a method therefor Ground fault detector for an inverter and a method therefor

1991-12-16

1993-05-25

Beha, Jr., William H.

Electric power conversion systems

Current conversion

Including an a.c.-d.c.-a.c. converter

361 42, 363 56, 363 98, H02M 5458, H02H 712

Patent

active

052145751

ABSTRACT:
An apparatus and method for detecting a ground fault occurring on an output side of an inverter circuit, which includes a converter circuit for rectifying an alternating current into a direct current, a capacitor for smoothing the direct current, an inverter circuit for converting the smoothed direct current into a predetermined frequency and voltage through the on/off operation of switching elements connected in parallel with diodes, and a PWM signal generator for controlling the on/off of the switching elements. The ground fault detector includes current detectors for detecting current flowing in the switching elements, a device for detecting an overcurrent flowing from one of the switching elements and for outputting an overcurrent signal when the output of any of the current detectors exceeds a predetermined value, a device for detecting a zero vector signal transmitted by the PWM signal generator, and a ground fault detector circuit for detecting a ground fault condition in accordance with the overcurrent signal and the zero vector detection signal.

REFERENCES:
patent: 4370702 (1983-01-01), Shuey
patent: 4870527 (1989-09-01), Zaleski
patent: 4893479 (1990-01-01), Gillett et al.

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