Ground-safety controller

Details Ground-safety controller Ground-safety controller

1991-11-12

1993-01-12

Logan, Sharon D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 50, H02H 314

Patent

active

051794900

ABSTRACT:
A ground fault interrupter circuit is disclosed, comprising a high-voltage input from a public utility transformer, polarity reversal means coupled to the high-voltage input with polarity-switchable output coupled through a thyristor to a relay means. Radio frequency (RF) detection means are coupled to the thyristor gate, causing the thyristor to energize the relay and interrupt load power when radio frequency interference is detected from the load. The RF detector means comprises a plurality of RF chokes and resistor-capacitor pairs feeding a rectifier diode coupled to the thyristor gate. When RF is detected, the diode feeds negative direct current to the thyristor gate, interrupting conduction of the thyristor and the LOAD.

REFERENCES:
patent: 4138707 (1979-02-01), Gross
patent: 4231372 (1980-11-01), Newton
patent: 4429338 (1984-01-01), Becker et al.
patent: 4783713 (1988-11-01), Chen

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