High voltage d-c current limiter

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

G - Physics

05

F

G05F 3/02 (2006.01) H02H 9/02 (2006.01) H02H 9/04 (2006.01)

Patent

CA 2143711

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.

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