Protection circuit for an excitation current source

Details Protection circuit for an excitation current source Protection circuit for an excitation current source

1998-04-13

2000-06-06

Leja, Ronald W.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

361 90, 323284, H02H 324, H02H 900

Patent

active

060726768

ABSTRACT:
A protection circuit for an excitation current source protects against excessive compliance voltage by using a cascode transistor between the current source and an output terminal, and a transistor coupled to the output terminal and to the control lead of the cascode transistor to cause the cascode transistor to turn off if the voltage exceeds a threshold level.

REFERENCES:
patent: 3673508 (1972-06-01), Callahan, Jr.
patent: 4511857 (1985-04-01), Gunderson
patent: 4967103 (1990-10-01), Dikken et al.
patent: 5359296 (1994-10-01), Brooks et al.
patent: 5525934 (1996-06-01), Chiu et al.
patent: 5648739 (1997-07-01), Walther et al.
patent: 5675341 (1997-10-01), Vallancourt et al.
patent: 5764464 (1998-06-01), Botker et al.

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