Power outlet ground integrity and wriststrap monitor circuit

Details Power outlet ground integrity and wriststrap monitor circuit Power outlet ground integrity and wriststrap monitor circuit

1988-08-29

1991-09-24

Orsino, Joseph A.

Communications: electrical

Condition responsive indicating system

Specific condition

340656, 324510, G08B 2100

Patent

active

050517325

ABSTRACT:
A plug-mounted wriststrap detector and ground monitor includes hot, neutral and ground input terminals which are connected to corresponding terminals of a power outlet when the circuit is plugged in. A jack is provided to plug a wriststrap into the circuit to provide electrostatic protection to the user. Means are provided to detect that the user is wearing the wriststrap and that the wriststrap is properly connected to the circuit as a function of whether an a.c. signal of sufficient amplitude is detected coupled to the circuit by the wriststrap and/or user. Lamps and an audible alarm warn the user if the wriststrap is not properly connected. A precision ground integrity circuit is provided to detect whether an unsafe ground condition exists and to alert the user accordingly. The ground integrity circuit uses a constant current source and voltage comparator to determine that the ground impedance does not exceed a predetermined limit.

REFERENCES:
patent: 3783340 (1974-01-01), Becker
patent: 3784842 (1974-01-01), Kremer
patent: 3836844 (1974-09-01), Prugh
patent: 3868566 (1975-02-01), Parsons et al.
patent: 4506260 (1985-03-01), Woodruff et al.
patent: 4558309 (1985-12-01), Antonevich
patent: 4638399 (1987-01-01), Maroney et al.
patent: 4649374 (1987-03-01), Hoigaard
patent: 4710751 (1987-12-01), Webster
patent: 4785294 (1988-11-01), Campbell
patent: 4800374 (1989-01-01), Jacobson

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