Electricity: electrical systems and devices – Safety and protection of systems and devices – Impedance insertion
Patent
1996-08-29
1998-03-17
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Impedance insertion
361 91, H02H 900
Patent
active
057294186
ABSTRACT:
A high voltage current limiting protection circuit for measurement equipment and measurement probes. The circuit is comprised of a plurality of elements one of which is variable resistance means which are coupled between a first terminal and a second terminal of the circuit for generating a low resistance level to allow a fast response by the measurement equipment to measure current flowing between the two terminals. The variable resistance means generates a high resistance level to limit current flow to a minimum level between the two terminals when a predetermined maximum voltage level across the two terminals is exceeded. Voltage trip point means are coupled to the variable resistance means for setting the predetermined maximum voltage level to trigger the variable resistance means to generate the high resistance level to limit current flow between the two terminals to the minimum level.
REFERENCES:
patent: 4533970 (1985-08-01), Brown
patent: 4811156 (1989-03-01), Kroll
Gaffin Jeffrey A.
Moy Jeffrey D.
Sherry Michael J.
Supertex Inc.
Weiss Harry M.
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