Electricity: electrical systems and devices – Safety and protection of systems and devices – Load shunting by fault responsive means
Patent
1976-10-01
1978-05-23
Pellinen, A. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Load shunting by fault responsive means
323 9, 361 91, 324110, H02H 320
Patent
active
040914321
ABSTRACT:
A closed loop operational amplifier circuit for providing a constant current in the closed loop for generating a precision constant current through an unknown resistance for measuring the resultant voltage drop across the resistance. The closed loop circuit having a compliance circuit with a high voltage diode for preventing damage to a transistor in the compliance circuit in one polarity direction and a current limiting circuit including the transistor for preventing damage to the transistor from high voltage in the opposite polarity direction, and a voltage comparison circuit responsive to a high voltage in the opposite direction for reverse biasing the high voltage transistor to prevent it from entering the secondary breakdown mode.
REFERENCES:
patent: 3234453 (1966-02-01), Klees
patent: 3304489 (1967-02-01), Brolin et al.
patent: 3526810 (1970-09-01), Williams et al.
patent: 3571608 (1971-03-01), Hurd
patent: 3702434 (1972-11-01), Ryan
patent: 3819983 (1974-06-01), Bjork
patent: 3890559 (1975-06-01), Kuster
patent: 3979642 (1976-09-01), Cath et al.
Aiken Industries, Inc. California Instruments Division
Pellinen A. D.
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