Electrical resistors – Resistance value responsive to a condition – Current and/or voltage
Patent
1999-01-07
2000-12-05
Donovan, Lincoln
Electrical resistors
Resistance value responsive to a condition
Current and/or voltage
338225D, H01C 710
Patent
active
06157290&
ABSTRACT:
The resistor body of a nonlinear resistor element having PTC characteristics includes a pulverulent first filler, whose material, e.g. TiB.sub.2, TiC, VC, WC, ZrBr.sub.2, MoSi.sub.2, has a specific conductivity of at most 10.sup.-3 .OMEGA.cm and in which the particle sizes are between 10 and 40.mu., and also, in order to improve the voltage sustaining capability by extending the switching zone and to achieve uniform energy absorption, includes a likewise pulverulent second filler having varistor characteristics and particle sizes between 50 and 200.mu., whose specific resistance at field strengths .gtoreq.2000 V/cm such as occur in the switching region of the resistor element and above, is at most 50 .OMEGA.cm, preferably at most 15 .OMEGA.cm, the fillers being embedded in a matrix made of a thermoplastic, in particular HD polyethylene or a thermoset. The average particle size of the second filler should exceed that of the first filler by a factor of from 2 to 5. A potentially particularly suitable material for the second filler is SiC doped with Al, B, Ga, In, N, P, As, as is similarly doped ZnO.
REFERENCES:
patent: 5313184 (1994-05-01), Greuter et al.
patent: 5378407 (1995-01-01), Chandler et al.
patent: 5798060 (1998-08-01), Brevett
Glatz-Reichenbach Joachim
Greuter Felix
Skindhoj Jorgen
Strumpler Ralf
ABB Research Ltd.
Donovan Lincoln
Lee Kyung S.
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