Apparatus and methods for coupling a case of an electric applian

Details Apparatus and methods for coupling a case of an electric applian Apparatus and methods for coupling a case of an electric applian

1995-04-13

1997-03-25

Hofsass, Jeffery

Communications: electrical

Condition responsive indicating system

Specific condition

340650, 340651, G08B 2100

Patent

active

056148895

ABSTRACT:
The apparatus for automatically coupling an internal ground of an electric appliance to an external ground, comprises first and second AC power lines for supplying an AC input to a load; a neutral ground generating circuit for combining the first and the second AC power lines to produce a neutral ground point; a first detection circuit for detecting a current flow from the first AC power line to the internal ground to generate a first current detection signal; a second detection circuit for detecting a current flow from the second AC power line to the internal ground to generate a second current detection signal; and a ground coupling circuit for connecting, in response to the second current detection signal, the first AC power line as the external ground to the internal ground; for connecting in response to the first current detection signal, the second AC power line as the external ground to the internal ground; and for connecting the neutral ground point as the external ground to the internal ground when the first and the second current detection signals are absent.

REFERENCES:
patent: 4415944 (1983-11-01), Walker
patent: 4506260 (1985-03-01), Woodruff
patent: 4882522 (1989-11-01), Brown
patent: 5065104 (1991-11-01), Kusko et al.
patent: 5224006 (1993-06-01), MacKenzie et al.
patent: 5311138 (1994-05-01), Ott et al.
patent: 5398149 (1995-03-01), Weil

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