Varistors with controllable voltage versus time response
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United States of America Patent
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Aug 9, 1983
Grant Date -
N/A
app pub date -
Jun 1, 1981
filing date -
Jun 1, 1981
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A bismuth-free, zinc oxide based varistor exhibits a controllable overshoot/undershoot voltage characteristic. The varistor is composed of zinc oxide as the primary constituent, with smaller quantities of barium, boron, one or more transition elements and aluminum. Varistor voltage versus time response is dependent on the degree of aluminum doping. Typically, more than approximately 0.003 mole percent, but less than approximately 0.1 mole percent aluminum is employed, depending on desired voltage overshoot/undershoot characteristic.
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