| 摘要 |
A method and apparatus for protecting an I/O electronic circuit against overvoltages includes a first current path comprising a first diode (V1N), through which current path a current (ip) flows when the overvoltage is negative. A second current path includes a second diode (V1P) and a thyristor (T1), the thyristor (T1) being fired by means of a time-delay circuit charged by a positive voltage. Current flowing throu gh the current paths is used to trigger a protection device, such as a circuit breaker, to cut off the overvoltage power supply.
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