PTC thermistor and a current limiter device having at least one

Details PTC thermistor and a current limiter device having at least one PTC thermistor and a current limiter device having at least one

1997-07-16

2000-07-25

Easthom, Karl

Electrical resistors

Resistance value responsive to a condition

Current and/or voltage

338 53, 338 55, 338283, 338210, H01C 710

Patent

active

060941294

ABSTRACT:
PTC thermistors are used in reversible short circuit current limiters, in particular in series connection with electrical valves and/or capacitors. An electrically insulated, thermally conductive insulation or ceramic layer (20) is in contact electrically and with good thermal conduction via a first main surface with a metallic cooling element (25). A second main surface of the ceramic layer (20), opposite the first main surface, is covered with an electrically insulating thermal-conduction layer (21) having a thickness in the range from 10 .mu.m-100 .mu.m. Meandering tracks (16) of the resistive body of the PTC thermistor (5) are pressed between this thermal conduction layer (21) and an electrically insulating, preferably thermally conductive, flexible high-temperature stable polymer film (22). In order to provide pressure, a pressure compensation cushion (23) on which a force (F) orthogonal to the second main surface of the ceramic layer (20) acts, may be provided. The pressure compensation cushion (23) is filled with a dielectric or electrically conductive fluid (24) having a boiling temperature above preferably 150.degree. C. The resistive track (16) may also be embedded in a filled polymer matrix, it being possible for geometrically congruent resistive tracks to be opposite on a ceramic layer.

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