Solid state overvoltage protection circuit
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United States of America Patent
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-
Feb 27, 1990
Grant Date -
N/A
app pub date -
Jun 27, 1988
filing date -
Jun 27, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An overvoltage protection circuit for electronic equipment having tip and ring lines includes a first voltage sensitive switch having first and second teminals. The first terminal of the first switch is connected to the tip line. A second voltage sensitive switch includes first and second terminals. The first terminal of the second switch is connected to the second terminal of the first switch, and the second terminal thereof is connected to the ring line. A third voltage sensitive switch includes first and second terminals. The first terminal of the third switch is connected to the second terminal of the first switch and to the first terminal of the second switch. The second terminal of the third switch is connected to ground potential. The switches are conductive when a respective voltage threshold is exceeded.
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