Overvoltage protection for input/output circuits
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United States of America Patent
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-
May 27, 1997
Issued Date -
N/A
app pub date -
Jul 30, 1996
filing date -
Apr 14, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention relates to a method for protecting an I/O electronic circuit against overvoltages. The I/O circuit of the electronic circuit is provided with a current path (1) comprising a first diode (V1N), through which current path a current (ip) flows when the mains voltage is negative, and with a second current path (2) comprising a second diode (V1P) and a thyristor (T1), the thyristor (T1) being fired by a time-delay circuit charged by a positive voltage, and that the current flowing through the current paths (1,2) is used to trigger a protection device.
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