High voltage d-c current limiter

Details High voltage d-c current limiter High voltage d-c current limiter

1996-07-30

1997-07-01

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

361106, 338 21, 338 22R, 338 49, 338320, H02H 900, H01H 700

Patent

active

056444613

ABSTRACT:
A current limiter for protecting a circuit at a predetermined driving voltage in excess of 50 volts which includes a plurality of PTC resistors connected in series, with a zener diode connected in parallel with each of the PTC resistors, and wherein each of the PTC resistors has a predetermined voltage capacity limit such that the total of the predetermined capacity limits of the PTC resistors exceeds the predetermined driving voltage, and each of the zener diodes has a zener voltage rating less than the predetermined voltage capacity limit of the individual PTC resistor connected in parallel therewith, and the total of the zener voltage ratings of the zener diodes also exceed the predetermined driving voltage.

REFERENCES:
patent: 4967176 (1990-10-01), Horsma et al.
patent: 5227944 (1993-07-01), Eggendorfer
patent: 5294852 (1994-03-01), Straker
patent: 5379022 (1995-01-01), Bacon et al.
patent: 5379176 (1995-01-01), Bacon et al.
patent: 5513059 (1996-04-01), Atkins

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