PTC device
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United States of America Patent
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-
Oct 25, 1994
Grant Date -
N/A
app pub date -
May 7, 1992
filing date -
May 7, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A PTC device has two electrodes affixed to opposed surfaces. The electrodes consist of a metal foil having a conductive layer on their surfaces that contact the PTC material. The conductive layer has a thermal coefficient of expansion intermediate between the thermal coefficients of expansion of the metal foil and the PTC material. The intermediate value of the thermal coefficient of expansion of the conductive layer prevents peeling of the electrodes off the PTC element due to the variation of the temperature of the PTC device resulting from repeated voltage applications. In addition, improved adhesion of the electrodes to the PTC material reduces resistance changes after repeated temperature cycling.
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