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    1.
    发明专利
    未知

    公开(公告)号：DE59712291D1

    公开(公告)日：2005-06-09

    申请号：DE59712291

    申请日：1997-03-03

    Applicant: ABB RESEARCH LTD

    Inventor： GLATZ-REICHENBACH DR ,  GREUTER DR ,  MAUTHE GERHARD ,  PELANEK ZDENEK ,  SCHUELER DR ,  SKINDHOJ DR ,  STRUEMPLER DR

    IPC: H01C1/14 ,  H01C7/02 ,  H01C7/12 ,  H01C7/13 ,  H01C13/02

    Abstract: The resistance has a pair of parallel terminal electrodes (1,2) in flat contact with a resistance body (3) which has a positive temperature coefficient characteristic. A varistor (40) lies in electrical contact with the resistance body which has 2 contact surfaces (50,51). The response point (60) of the resistance body is connected in parallel with the varistor through the surfaces. A number of series connected varistors (41,42,43,44) may contact respective meanders of a zigzag resistance body between the parallel terminal electrodes via respective contact surfaces (52,53).

    2.
    发明专利
    未知

    公开(公告)号：DE59804235D1

    公开(公告)日：2002-07-04

    申请号：DE59804235

    申请日：1998-12-10

    Applicant: ABB RESEARCH LTD

    Inventor： GLATZ-REICHENBACH DR ,  STRUEMPLER DR ,  SKINDHOJ DR ,  GREUTER DR

    IPC: H01C7/02 ,  H01C7/112

    Abstract: The resistor body of a nonlinear resistor element having PTC characteristics includes a pulverulent first filler, whose material, e.g. TiB2, TiC, VC, WC, ZrBr2, MoSi2, has a specific conductivity of at most 10-3 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 >/=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.

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