Switching circuit for switching the mode of operation of a subte

Details Switching circuit for switching the mode of operation of a subte Switching circuit for switching the mode of operation of a subte

1997-06-03

1999-07-27

Gaffin, Jeffrey

Electrical transmission or interconnection systems

Switching systems

Condition responsive

307112, 361191, 361210, 361156, 33304, H01N 4700

Patent

active

059295406

ABSTRACT:
A switching circuit for use in a subterranean probe for switching between to two modes of operation used to perform a survey of a well borehole. The switching circuit comprises a first voltage bias network which is biased to a predetermined overvoltage criterion; a second voltage bias network which is biased to a predetermined negative voltage criterion; a switch; and a negative voltage blocking diode for blocking the predetermined negative voltage criterion for allowing the first voltage bias network to fully realize the negative voltage criterion.

REFERENCES:
patent: 4361192 (1982-11-01), Trowsdale
patent: 4527216 (1985-07-01), Stammely
patent: 5230387 (1993-07-01), Waters et al.
patent: 5508878 (1996-04-01), Pecore

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