Electricity: electrical systems and devices – Safety and protection of systems and devices – Ground fault protection
Patent
1989-02-10
1990-07-24
Beha, Jr., William H.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Ground fault protection
307326, 315119, 315225, 363 37, 363 56, H05B 4129
Patent
active
049438867
ABSTRACT:
Circuitry for limiting a high frequency current through a load including a DC voltage source connected to a circuit ground; an inverter for converting the DC voltage to the high frequency current, the inverter being connected to circuit ground; a chassis containing the voltage source and the inverter where the chassis is connected to earth ground and where earth ground and circuit ground are at different electric potentials; sensing circuitry connected between earth ground and one of the output terminals of the voltage source to establish a current path from earth ground to the one output terminal of the voltage source to thus monitor any high frequency current which may flow through a person, for example, connected between one of the output terminals of the inverter and earth ground; and limiting circuitry for limiting the high frequency current through the person in response to the current through the person exceeding a predetermined limit.
REFERENCES:
patent: 4127893 (1978-11-01), Goepel
patent: 4392087 (1983-07-01), Zansky
patent: 4461980 (1984-07-01), Nilssen
patent: 4507698 (1985-03-01), Nilssen
patent: 4563719 (1986-01-01), Nilssen
patent: 4675576 (1987-06-01), Nilssen
Beha Jr. William H.
Etta Industries, Inc.
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